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Sample records for central laguna verde

  1. Design optimization of the Laguna Verde nuclear power station fuel recharge; Optimacion del diseno de recargas de combustible para la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Cortes Campos, Carlos Cristobal [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Montes Tadeo, Jose Luis [Instituto Nacional de Investigaciones Nucleares (ININ), Salazar (Mexico)

    1991-12-31

    It is described, in general terms, the procedure that is followed to accomplish the optimization of the recharge design, and an example is shown where this procedure was applied for the analysis of the type BWR reactor of Unit No. 1 of the Laguna Verde Nuclear Power Station. [Espanol] Se describe en terminos generales el procedimiento que se sigue para realizar la optimacion del diseno de recargas, y se muestra un ejemplo en el que se utilizo dicho procedimiento para el analisis del reactor tipo BWR de la unidad 1, de la Central Laguna Verde (CLV).

  2. Optimization of reloading Laguna Verde Central U1/U2, Federal Electricity Commission; Optimizacion de recargas Central Laguna Verde U1/U2, Comision Federal de Electricidad

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    Espinosa G, J.M. [Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km. 45.5, Municipio de Alto Lucero, Veracruz (Mexico)

    2006-07-01

    The Laguna Verde Central from the beginning of the commercial operation settled down as maximum priority 'the total safety in its operation' taking in consideration the so much experience of the good operation and of multiple recharges made in a sure and reliable way, and without separate us of the safety mystic of the CLV, but looking for to be better every day a new challenge it settled down 'to compare us with the best plants in the world' and certainly to work to classify us like one of them. For this we established a 4.0 year old plan (2003/2006) for the effectiveness all the processes in the power station that allowed us to measure our acting with the same parameters that settle down at international level (nuclear safety, industrial safety, radiological safety, capacity factor, readiness factor, cleaning of the power station, attachment to procedures, attention to the detail and certainly to be competitive in the economic aspect, summing up means to be good in all the aspects). All the above mentioned would allow us to qualify us as level 1 of WANO (world proprietors association of nuclear centrals) at the end of the year 2006 and to pass to be part of this select group. After analyzing the acting record of the power station, evaluating our technical and economic capacity, the location of the installation besides revising the international experiences was defined that one of the concepts that impact considerably so much to the capacity factors and availability besides the dose and production cost is the duration of the recharge periods, for this reason the present work is elaborated. (Author)

  3. Negative sequence relay applied to generator 1 of the Laguna Verde nuclear power plant; Aplicacion de un relevador de secuencia negativa en el generador 1 de la central de Laguna Verde

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    Diaz de la Serna P, Enrique [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    The rotor of a synchronous generator can be dangerously heated in a short time by stator current unbalance, therefore it must be protected with a specific relay. This article discusses the protection and the adjustments selected for Unit 1 of the Comision Federal de Electricidad Laguna Verde Nuclear Nuclear Power Station. [Espanol] El rotor de un generador sincrono puede calentarse peligrosamente en un tiempo corto debido a desbalance de corrientes en el estator, por lo que debe protegerse con un relevador especifico. En este articulo se describen la proteccion y los ajustes seleccionados para la unidad 1, de la central nucleoelectrica Laguna Verde de la Comision Federal de Electricidad.

  4. Multivariate analysis in the frequency mastery applied to the Laguna Verde Central; Analisis multivariable en el dominio de la frecuencia aplicado a la Central Laguna Verde

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    Castillo D, R.; Ortiz V, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Calleros M, G. [CFE, Central Nucleoelectrica de Laguna Verde, carretera Nautla-Cardel Km. 42.5, Alto Lucero, Veracruz (Mexico)]. e-mail: rcd@nuclear.inin.mx

    2006-07-01

    The noise analysis is an auxiliary tool in the detection of abnormal operation conditions of equipment, instruments or systems that affect to the dynamic behavior of the reactor. The spectral density of normalized power has usually been used (NPSD, by its initials in English), to watch over the behavior of some components of the reactor, for example, the jet pumps, the recirculation pumps, valves of flow control in the recirculation knots, etc. The behavior change is determined by individual analysis of the NPSD of the signals of the components in study. An alternative analysis that can allow to obtain major information on the component under surveillance is the multivariate autoregressive analysis (MAR, by its initials in English), which allows to know the relationship that exists among diverse signals of the reactor systems, in the time domain. In the space of the frequency, the relative contribution of power (RPC for their initials in English) it quantifies the influence of the variables of the systems on a variable of interest. The RPC allows, therefore that for a peak shown in the NPSD of a variable, it can be determine the influence from other variables to that frequency of interest. This facilitates, in principle, the pursuit of the important physical parameters during an event, and to study their interrelation. In this work, by way of example of the application of the RPC, two events happened in the Laguna Verde Central are analyzed: the rods blockade alarms by high scale in the monitors of average power, in which it was presents a power peak of 12% of width peak to peak, and the power oscillations event. The main obtained result of the analysis of the control rods blockade alarm event was that it was detected that the power peak observed in the signals of the average power monitors was caused by the movement of the valve of flow control of recirculation of the knot B. In the other oscillation event the results its show the mechanism of the oscillation of

  5. Early alert system for oscillations detection applied to the Central of Laguna Verde; Sistema de alerta temprana para deteccion de oscilaciones aplicada a la Central Laguna Verde

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    Calleros M, G.; Zapata Y, M.; Avila N, A.; Herrera H, S. F., E-mail: gcm9acpp@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Veder, Carretera Cardel-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2011-11-15

    The code Early Alert System developed by Engineering of the Reactor of the nuclear power plant of Laguna Verde is presented, showing its reliability like preventive and corrective instrument to external interferences to the reactor core, due to equipment malfunction associated to the typical systems of a nuclear power plant, as those that control the reactor pressure, those that feed water to the reactor, those that control the valves of the main turbine. With this purpose, real cases of application of the System are shown where the results are compared with the independent evaluations carried out by the supplier, observing compatibility in both results. The benefits of the logarithm are discussed in the nuclear industry as soon as in non nuclear ambits. (Author)

  6. The continuous improvement system of nuclear power plant of Laguna Verde; El sistema de mejora continua de la central nucleoelectrica Laguna Verde

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    Rivera C, A. [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Km. 42.5 Cardel-Nautla, Veracruz (Mexico)], e-mail: arr99999@cfe.gob.mx

    2009-10-15

    This paper describes the continuous improvement system of nuclear power plant of Laguna Verde and the achievements in implementing the same and additionally two study cases are presents. In February 2009 is noteworthy because the World Association of Nuclear Operators we identified as a learning organization, qualification which shows that the continuous improvement system has matured, and this system will expose as I get to learn to capitalize on our own experiences and external experiences diffused by the nuclear industry. In 2007 the management of nuclear power plants integrates its improvement systems and calls it continuous improvement system and is presented in the same extensive report that won the National Quality Award. This system is made up of 5 subsystems operating individually and are also related 1) human performance; 2) referential comparison or benchmarking; 3) self-assessment; 4) corrective action and 5) external operating experience. Five subsystems that plan, generate, capture, manage, communicate and protect the knowledge generated during the processes execution of nuclear power plant of Laguna Verde, as well as from external sources. The target set in 2007 was to increase the intellectual capital to always give response to meeting the security requirements, but creating a higher value to quality, customer, environment protection and society. In brief each of them, highlighting the objective, expectations management, implementation and some benefits. At the end they will describe two study cases selected to illustrate these cases as the organization learns by their continuous improvement system. (Author)

  7. Strategic planning 2007-2011, an opportunity for quality, competitiveness and excellence of the Laguna Verde Central; Planeacion estrategica 2007-2011, una oportunidad para la calidad, competitividad y excelencia de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Rivera C, A. [CFE, Central Laguna Verde, Kilometro 42.5 Cardel Nautla, Veracruz (Mexico)]. e-mail: arr99999@cfe.gob.mx

    2007-07-01

    The reason is to give to know to the nuclear community in Mexico the good results that it located in the 2006 to the Laguna Verde Nucleo electric Central in the classification of the World Association of Nuclear Operators (WANO) like one of the best in the worldwide scale, and their Strategic Plan 2007-2011 like an opportunity to continue improving the Quality, the Competitiveness and the Excellency in their Generating Units. It stands out that the fuel reloads are carried out in systemic form in less than 30 days, and also other achievements like it is the certificate granted by PROFEPA of Clean Industry, the renovation of the Certifications of the ISO-9001 and the ISO-14001, as well as the accredit of the Laboratories, and they will give data of the project of the increment of power that their power rose in 15%. For those results in the Strategic Planning 2007-2011 are pointed out that the Laguna Verde Central is a highly viable option in Mexico, when continuing with reloads that will allow a capacity factor up of 90%, and the other concepts that will give the obtaining of the qualification level 1 of WANO in this strategic period. Finally I will conclude with the good news for the Nuclear Industry in Mexico that published the Reforma newspaper at November 01, 2006: 'To the president of Mexico, Felipe Calderon, interests him to impel during his command the alternating energy sources to the hydrocarbons, known it is that the hydrocarbons (petroleum, coal or natural gas) they are finite, while the appetite of the world for the energy is infinite. As you they know, Mexico possesses a nuclear plant that generates energy starting from enriched uranium: the famous Laguna Verde Thermonuclear Central. He declared that Mexico can and it should advance for the one on the way to the energy generation for the nuclear road.' (Author)0.

  8. Planning of activities in the Laguna Verde Central planning at 12 weeks; Planeacion de Actividades en la Central Laguna Verde planeacion a doce semanas

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    Chimalpopoca, C. [Comision Federal de Electricidad, Central Laguna Verde, Subgerencia General de Operacion y Planeacion, Veracruz (Mexico)]. e-mail: carlos.chimalpopoca@cfe.gob.mx

    2007-07-01

    The universe of works that are carried out in a nuclear facility to maintain effective the structures, systems and components require of a continuous analysis, in the order of the maintenance frequencies that can be of the preventive, predictive or corrective type. Each component is associated to reserve parts, readiness of systems, in fulfillment to the operation technical specifications, to the environment of the one work; each component requires of a planning level, where it is distinguished with clarity when they are executed, in the operation stage, stop or recharge. This work has as end to show like the activities are planned during the operation, using planning methods to twelve weeks, where the reach of the task is conceptualized, operative requirements, of reserve parts, of the work environment analysis, of those radiological conditions, of the authorizations for their execution, the same execution and the evaluation post work like a technique to maintain in continuous improvement the tasks of the maintenance of the Units of the Power station. A motor valve to be worked in its internals requires access to the work point, it requires bill of the system, electric disconnection, maneuvers to disassemble actuators and retirement of thermal isolation if it applies, reserve parts of the caps joints, control mechanisms, personal, tools, radiological control. The success of the continuous operation of a power station is in the planning quality, the attention of each one of the details to assure that the components, structures and components stay effective to make their function when they are demanded. The planning task requires of experience and knowledge of each some of the components, the task of planning of activities and its execution is multidisciplinary This work has that purpose, to show the planning tools in the Laguna Verde Nuclear Power station, under the concept of twelve weeks. (Author)

  9. Application of six sigma to reloads design of the Laguna Verde Central with length until 17 days; Aplicacion de seis sigma para disenar recargas de la Central Laguna Verde con duracion hasta de 17 dias

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    Espinosa G, J.M. [Comision Federal de Electricidad, Central Laguna Verde, Subgerencia General de Operacion, Planeacion, Veracruz (Mexico)]. e-mail: mespinos@cfe.gob.mx

    2007-07-01

    The more important value in the Laguna Verde Central it is the safety. The international experience it confirms us that the more safe plants its are those more productive, this conclusion and reasoning indicate to the power station that we are in the correct road, improving the acting we will obtain that greater interest for us in the Laguna Verde Central (to increase the safety) and as added value to be able to be one of the best business for the Federal Commission of Electricity. With a future vision and commitment of high acting was integrated in an external place to all the area headquarters: (Maintenance, Planning, Operation, Parts of Reserve, Finances, Contracts, Supplies, Warehouse, design Engineering, place Engineering, engineering of systems, radiological Protection, etc.) to carry out a combined work with the unique challenge of drifting with the biggest level detail the program of a recharge and certainly to get ready to achieve their execution (all this without omitting any consideration for smaller or simpler than it seemed), looking for high quality in the works, with and bigger level of safety, with the minimum possible dose, the more reasonable cost and considering a new concept of human character, to achieve the above-mentioned without the participant personnel's stress, with the premise that a good plan and commitment of all the only one that it can bring us as result it is the success of the whole organization. (Author)

  10. Implementation of the project of equipment reliability in the nuclear power plant of Laguna Verde; Implementacion del proyecto de confiabilidad de equipo en la Central Nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Rios O, J. E.; Martinez L, A. G. [CFE, Central Laguna Verde, Subgerencia General de Operacion, Veracruz (Mexico)]. e-mail: jrios@cfe.gob.mx

    2008-07-01

    A equipment is reliable if it fulfills the function for which was designed and when it is required. To implement a project of reliability in a nuclear power plant this associate to a process of continuous analysis of the operation, of the conditions and faults of the equipment. The analysis of the operation of a system, of the equipment of the same faults and the parts that integrate to equipment take to identify the potential causes of faults. The predictive analysis on components and equipment allow to rectify and to establish guides to optimize the maintenance and to guarantee the reliability and function of the same ones. The reliability in the equipment is without place to doubts a wide project that embraces from the more small component of the equipment going by the proof of the parts of reserve, the operation conditions until the operative techniques of analysis. Without place of doubt for a nuclear power plant the taking of decisions based on the reliability of their systems and equipment will be the appropriate for to assure the operation and reliability of the same one. In this work would appear the project of reliability its processes, criteria, indicators action of improvement and the interaction of the different disciplines from the Nuclear Power Plant of Laguna Verde like a fundamental point for it put in operation. (Author)

  11. Economic analysis of extended cycles in the Laguna Verde nuclear power plant; Analisis economico de ciclos de extendidos en la Central Nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez N, H.; Hernandez M, J.L.; Francois L, J.L. [Facultad de Ingenieria, UNAM, 04510 Mexico D.F. (Mexico)]. E-mail: hermilo@correo.unam.mx

    2004-07-01

    The present work presents a preliminary analysis of economic type of extended cycles of operation of the Unit One in the Laguna Verde nuclear power plant. It is analysed an equilibrium cycle of 18 months firstly, with base to the Plan of Use of Energy of the Federal Commission of Electricity, being evaluated the cost of the energy until the end of the useful life of the plant. Later on an alternative recharge scenario is presented with base to an equilibrium cycle of 24 months, implemented to the beginning of the cycle 11, without considering transition cycles. It is added in both cycles the cost of the substitution energy, considering the unitary cost of the fuel of a dual thermoelectric power station of 350 M We and evaluating in each operation cycle, in both scenarios, the value of the substitution energy. The results show that a reduction of the days of recharge in the cycle of 24 months could make this option but favorable economically. The duration of the period of recharge rebounds in considerable grade in the cost of energy generation for concept of fuel. (Author)

  12. Reproduction of the flow-power map of the Laguna Verde power plant; Reproduccion del mapa flujo-potencia de la Central Laguna Verde

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    Amador G, R.; Gonzalez M, V.M. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1993-07-01

    The National Commission of Nuclear Safety and Safeguards (CNSNS) requires to have calculation tools which allows it to make analysis independent of the behavior of the reactor core of Laguna Verde nuclear power plant (CNLV) with the purpose to support the evaluation and discharge activities of the fuel recharges licensing. The software package Fms (Fuel Management System) allows to carry out an analysis of the core of the BWR type reactors along the operation cycle to detect possible anomalies and/or helping in the fuel management. In this work it is reproduced the flow-power for the CNLV using the Presto code of the Fms software package. The comparison of results with the map used by the operators of CNLV shows good agreement between them. Another exercise carried out was the changes study that the axial and radial power outlines undergo as well as the thermohydraulic parameters (LHGR, APLHGR, CPR) when moving a control rod. The obtained results show that is had the experience to effect analysis of the reactor behavior using the Presto-Fms code therefore the study of the rest of the software package for the obtention of nuclear parameters used in this code is recommended. (Author)

  13. Turbine model for the Laguna Verde nucleo electric central based in the RELAP code; Modelo de turbina para la Central nucleoelectrica de Laguna Verde basado en el codigo RELAP

    Energy Technology Data Exchange (ETDEWEB)

    Cortes M, F.S.; Ramos P, J.C.; Salazar S, E.; Chavez M, C. [Facultad de Ingenieria, Division de Estudios de Posgrado, Grupo de Ingenieria Nuclear, UNAM (Mexico)]. e-mail: cchavez2@cableonline.com.mx

    2003-07-01

    The Nuclear Power stations as Laguna Verde occupy at the present time a place every time but important as non pollutant alternative, economic and trusty to generate electricity. It is for it that the Group of Nuclear Engineering of the Engineering Faculty (GrlNFI) of the National Autonomous University of Mexico (UNAM) it develops investigation projects applied to Nuclear Centrals. One of the projects in process is the development of a Classroom simulator, which it can configures to consent to diverse models of nuclear systems with training purposes in normal operation, or, to consent to specialized nuclear codes for the analysis of transitory events and have a severe accident. This work describes the development, implementation and it proves of a simplified model of the Main turbine to be integrated to the group of models of the Classroom simulator. It is part of the current effort of GrlNFI guided to obtain a representation of all the dynamic models necessary to simulate the Plant Balance of the Laguna Verde Central. It is included the development of the unfolding graphic which represent the modeling of the Main turbine, and of the control interface that allows the user to manipulate in simple way, direct and interactive this device during the training or the analysis. With this work it is wanted to contribute to the training of new technicians and to support the operation personnel of the Centrals. Also, the developed infrastructure is guided to contribute in the design and analysis of new Nuclear Power stations with the contribution of new computational tools for the visualization, simulation and process control. (Author)

  14. Participation of the ININ in the activities of radioactive waste management of the Laguna Verde Central; Participacion del ININ en las actividades de gestion de desechos radiactivos de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Medrano L, M.; Rodriguez C, C.; Linares R, D. [ININ, Gerencia Subsede Sureste (Mexico); Ramirez G, R.; Zarate M, N. [Central Laguna Verde, CFE (Mexico)]. e-mail: maam@nuclear.inin.mx

    2006-07-01

    From the beginning of the operation of the Laguna Verde Central (CLV) the National Institute of Nuclear Research (ININ) has come supporting the CLV in the activities of administration of the humid and dry radioactive waste generated by the operation of the two units of the CLV, from the elaboration of procedures to the temporary storage in site, the implementation of a program of minimization and segregation of dry solid wastes, until the classification of the lots of humid waste and bulk dry wastes. In this work the description of the management activities of radioactive wastes carried out by the ININ in the facilities of the CLV to the date is presented, as well as some actions that they are had drifted in the future near, among those that it stands out the determination of the total alpha activity in humid samples by means of scintillation analysis. (Author)

  15. Actinides inventory of the nuclear power plant of Laguna Verde Unit 1; Inventario de actinidos de la Central Nuclear Laguna Verde Unidad 1

    Energy Technology Data Exchange (ETDEWEB)

    Martinez C, E.; Ramirez S, J. R. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Alonso V, G., E-mail: eduardo.martinez@inin.gob.mx [IPN, Escuela Superior de Fisica y Matematicas, Av. Instituto Politecnico Nacional s/n, U. P. Adolfo Lopez Mateos, Col. San Pedro Zacatenco, 07738 Mexico D. F. (Mexico)

    2013-10-15

    At the present time 435 nuclear power reactors exist for the electricity generation operating in the world and 63 in construction. Mexico has two reactors type BWR in the nuclear power plant of Laguna Verde. The nuclear fuel that is used in the nuclear reactors is retired of the reactor core when the energy that this contained has been extracted. This used fuel is known as spent nuclear fuel, the problem with this fuel is that was irradiated inside the reactor and continuous emitting a high radiation, as well as a significant heat quantity when being extracted, for what is necessary to maintain it in cooling and with some shielding to be protected of the radiation that emits. This objective is achieved confining the fuel in the spent nuclear fuel pool, where it is cooled and the same pool provides the necessary shielding to maintain the surroundings in safety radiation levels for the personnel that work in the power plant. An inconvenience of the pools is its limited storage capacity and that after certain time is necessary to remove the fuel, according to the established regulation to continue operating. To correct this inconvenience, two alternatives of spent fuel disposition exist, 1) the final disposition in deep geologic repositories and 2) the reprocessing and recycled of spent fuel. Each alternative presents its particularities and specific problems; however taking many years to be able to implement anyone of them. To carry out the second option, is indispensable to estimate the total mass of actinides generated in the spent nuclear fuel, that which represents to develop a methodology for it, this action is the main purpose of the present work. Inside our calculation method was necessary to appeal to diverse computation tools as the codes Origin-S and Keno V.a. Later on the obtained were compared with a problem type Benchmark, being obtained a smaller absolute error to 1.0%. (Author)

  16. Atmospheric particles in the central coastal zone of the Gulf of Mexico, Laguna Verde area, Veracruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Salazar L, S.; Alvarez D, C.; Mendoza M, R.; Perez A, J. A. [Laboratorio de Ingenieria Ambiental, Central Nucleoelectrica Laguna Verde, Comision Federal de Electricidad, Veracruz (Mexico); Castellanos R, M. A; Gomez L, B. [Departamento de Quimica Analitica, Laboratorio de Rayos X, Facultad de Quimica, UNAM, Mexico, D.F. (Mexico)

    1997-01-01

    The results of mass concentration of atmospheric particles collected by low volume samplers in sixteen monitoring stations of the Environmental Radiological Monitoring Network from Laguna Verde Nucleoelectric Plant, in Mexico, from 1991 to 1993, are reported. The levels of the yearly average mass concentrations were in a range of 22.6 {mu}g/m{sup 3} {+-} 5.0 {mu}g/m{sup 3} to 107.8 {mu}g/m{sup 3} {+-} 3.7 {mu}g/m{sup 3}. This variability is explained through the location of the stations, anthropogenic and natural influences. There were no significant differences in the average concentration over time. Moreover, the preliminary results of the chemical composition obtained by X Ray Fluorescence analysis are presented. [Spanish] Se presentan los resultados de la concentracion por peso de las particulas atmosfericas recolectadas con muestreadores de bajos volumenes en 16 estaciones de la Red del Monitoreo Radiologico Ambiental de la Central Nucleoelectrica Laguna Verde, en Mexico, durante el periodo 1991 a 1993. Los niveles de concentracion por peso de las particulas varian en un rango de promedios anuales de 22.6 {mu}g/m{sup 3} {+-} 5.0 {mu}g/m{sup 3} a 107.8 {mu}g/m{sup 3} {+-} 3.7 {mu}g/m{sup 3}. Esta variabilidad es explicada por la ubicacion de las estaciones, y las influencias naturales y antropogenicas. No fue observada variabilidad significativa en las concentraciones promedio a lo largo del tiempo. Se presentan los primeros resultados de la caracterizacion quimica del aerosol costero obtenido por medio de Fluorescencia de Rayos X.

  17. 15 years of production of electric energy of the Laguna Verde power plant, its plans and future; 15 anos de produccion de energia electrica de la Central Laguna Verde, sus planes y futuro

    Energy Technology Data Exchange (ETDEWEB)

    Rivera C, A. [CFE, Central Laguna Verde, Km. 42.5 Carretera Cardel-Nautla, Veracruz (Mexico)]. e-mail: arr99999@cfe.gob.mx

    2005-07-01

    In the year 2005 Laguna Verde power plant reaches 15 years of producing electric power in Mexico arriving to but of 100 million Megawatts-hour from their beginning of commercial activities. The Unit 1 that entered at July 29, 1990 and the Unit 2 at April 10, 1995, obtaining the Disposability Factors from their origin is: 84.63% in Unit 1 and 83.67% in Unit 2. The march of the X XI century gives big challenges of competition to the Laguna Verde Central, with the possible opening of the electric market to private investment, for their Goals and Objectives of a world class company, taking the evaluation system and qualification of the World Association of Nuclear Operators (WANO) that promotes the Excellence in the operation of the nuclear power stations in all their partners. This Association supports the development of programs that allow the monitoring of the behavior in Safety Culture, Human fulfilment, Equipment reliability, Industrial Safety, Planning, Programming and Control, Personalized Systematic Training, and the use of the Operational experience in the daily tasks. The present work tries to explain the system of evaluation/qualification of WANO, the definition of Goals and Objectives to reach the excellence and of the programs, it will present the Program of the Reliability of Equipment with its main actions the productivity. (Author)

  18. 30 years in the Veracruz state coast landscape: Laguna Verde nuclear power station. 1. ed.; 30 anos de paisaje costero veracruzano: Central Nucleoelectrica Laguan Verde

    Energy Technology Data Exchange (ETDEWEB)

    Guevara, S; Moreno Casasola, P; Castillo Campos, G; Dorantes, C; Gonzalez Garcia, F; Halffter, G; Isunza, E; Lot H, A; Mendoza, R; Paradowska, K; Priego, A; Sanchez Vigil, C; Vazquez, G [Comision Federal de Electricidad and Instituto Nacional de Ecologia A.C. (Mexico)

    2008-07-01

    results of the environmental measurements also demonstrate that the nuclear option of electrical energy generation, when it is operated with safety and efficiency, is one of the friendlier forms with the environment of power generation. [Spanish] Hace 36 anos nacio uno de los proyectos energeticos mas importantes de Mexico; el diseno y construccion de la Central Nuclear Laguna Verde. Este proyecto se volvio realidad gracias al compromiso de un grupo de profesionistas mexicanos que dieron lo mejor de ellos para su realizacion. En Mexico no existia en ese momento una legislacion que contemplara la proteccion del medio ambiente; sin embargo, la Constitucion preve que cuando en el pais no exista legislacion para el desarrollo de un proyecto. Este debe adoptar la legislacion del pais que lo esta vendiendo. En el caso especifico de Laguna Verde, se adopto la legislacion de los Estados Unidos de America y en la parte ambiental se tuvo que realizar el primer Manifiesto de Impacto Ambiental, que se titulo Informe ambiental para la construccion de la Central Nuclear Laguna Verde en el Estado de Veracruz. Este estudio lo realizaron varias instituciones tanto nacionales como extranjeras. Entre las mas sobresalientes se cuenta con: la Universidad Nacional autonoma de Mexico, el Instituto Politecnico Nacional, la Universidad Veracruzana, el Instituto Nacional para la Investigacion de los Recursos Biologicos, el Instituto de Ecologia, A.C. Con este informe, los ingenieros se dieron a la tarea de disenar y construir, los biologos y ecologos a realizar los estudios para mitigar los efectos causados al medio ambiente durante la construccion y, posteriormente, durante la operacion de la Central Nuclear. Despues de 18 anos de operacion comercial de la central se concluye el presente libro, en el cual se comparan los resultados obtenidos en 1972, cuando se iniciaron los estudios para el informe ambiental, contra los obtenidos a lo largo de este periodo. Es importante ver en los resultados de

  19. The Laguna Verde Central by it results in maintenance and operation consolidates it position of world class enterprise; La central Laguna Verde por sus resultados en mantenimiento y operacion consolida su posicion de empresa de clase mundial

    Energy Technology Data Exchange (ETDEWEB)

    Rivera C, A. [CFE, Central Laguna Verde, Km. 42.5 Carretera Cardel- Nautla, Veracruz (Mexico)

    2008-07-01

    This work has the objective of showing the results of the Laguna VerdeCentral in the maintenance and the operation that in the short term the generation of electricity in Mexico by nuclear means is a viable option, in virtue of their positioning like Company of World Class, when winning March 25, 2008 the National Prize of Quality with the more high qualification in the history of this prize, same that allows us to be very optimistic in increasing the possibility to that the Nuclear Industry in Mexico grows. The focus of the comparative graphs, with official data of the Comision Federal de Electricidad (CFE), it is so that it is observed that the Laguna Verde Central is above those the other types of generation like they are the Coal power stations, Thermoelectric, Hydroelectric, likewise they can see that we are for up of the Independent Producers of Energy. The information of the electric power generation is presented by reactors nuclear at world level that is growing, in having 31 Generating Units in the construction process that favors the decisions making in the Government federal, likewise contributed data of the increment projected for 2016 in the country of 380,102 GWh that equivalent to 63% of growth, where it exists without place to doubts a good opportunity for the nucleoelectricity. The Investment Works Program of Public Sector (POISE), it shows the information that 6,178 Mwe will be installed settled of a Non-defined Technology in Mexico, information that specifies the opportunity to be a viable option, because the one Plant Factor, the Production of Electric power, and the Variable Cost of Production, the energy generation by nuclear means is the more competitiveness. Finally this work stood out the effort that communitary works are developed to benefit to the society and the environment to be one Viable option not only for their high performance, or competitive for those more low costs, but also to improve the public opinion with the sustainable

  20. NucleoRed - Computerized system for increasing the effectiveness of the technical administrative conduct of the Laguna Verde Central; NucleoRed - Sistema computarizado para incrementar la efectividad de la gestion tecnico-administrativa de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Luna D, J. [Central Nucleoelectrica Laguna Verde, Carretera cardel-Nautla Km. 42.5 Veracruz (Mexico)]. e-mail: jluna@cfe.gob.mx

    2003-07-01

    The on-line systems for the management of the Laguna Verde Central (CLV) have had the challenge to evolve from the PC's of first generation until emigrate to the new Internet technologies, so that they allow to the diverse work groups to have the computer tool that allows them to gather the necessary data and to carry out efficiently the analysis of their results. To confront the previous challenge, in the CLV it has been developed and implemented the Nucleo Red that is an on-line system with the objective of providing in it lines strategic information for the Technician-administrative management of the plant in the nuclear context. The Nucleo Red is the computational tool that reflects the technical administrative processes implemented by personnel of the different Operative departments, it seeks to cooperate to the reliable and efficient operation of the first nucleo electric central of Mexico, with technology and Mexican personnel the one which already it had received international recognitions. The perspective of this computer system is to continue inside the process of continuous improvement and that although it was designed for a nucleo electric plant it can also be taken to the conventional plants of generation of electric power, so that this technology can be taken advantage of in other non nuclear facilities. The objective of the present work, is to show the new modules that have been developed in the Nucleo Red, its operation in general, and the benefits that it presents its use. (Author)

  1. Applications of the monitor of loose parts in the cycle 6 of the Laguna Verde Unit 2 power plant; Aplicaciones del monitor de partes sueltas en el ciclo 6 de la Unidad 2 de la central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Calleros, G.; Mendez, A.; Gomez, R.A. [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Veracruz (Mexico); Castillo, R.; Bravo, J.M. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico)]. E-mail: gcm9acpp@cfe.gob.mx

    2004-07-01

    The monitor of loose parts (Loose Parts Monitoring System) installed in the Unit 2 of the Laguna Verde Central is a tool to detect strange objects or parts loose in the system of refrigeration of the reactor that could be impacted in the walls of the recirculation knots or in the internal of the reactor. In this work two applications are shown carried out with the Monitor of Loose Parts, determining the characteristics of the stable nominal conditions, those which when changing, they are used to diagnose during the Cycle 6 of the Unit 2, failures in the components of the the recirculation circuits or to identify mechanical vibrations of the recirculation knots induced by a flow of recirculation bistable associated to operative conditions of the reactor. (Author)

  2. The National Institute of Nuclear Research (ININ) and its participation in the External Radiological Emergency Plans at Laguna Verde Power plant; El ININ y su participacion en el Plan de Emergencia Radiologica Externo de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Suarez, G. [Instituto Nacional de Investigaciones Nucleares, Departamento de Proteccion Radiologica, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    In this article it is described the form in which the ININ participates in the External Radiological Emergency Plan at Laguna Verde Power plant. It is set the objective, mission and organization of this plan. The responsibilities and activities that plan has assigned are mentioned also the organization to fulfil them and the obtained results during 9 years of participation. (Author)

  3. Safety enhancement solutions Laguna Verde NPP

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-10-15

    After the event happened in the nuclear power plant of Fukushima (Japan) proposals are carried out to improve the safety systems in the nuclear power plant of Laguna Verde (Mexico), from the application of the recommendations of the US NRC, until the considerations for the renovation of the operation license. (Author)

  4. Three stops of fuel reloading with length of less 30 days in the Laguna Verde Central; Tres paradas de recarga de combustible con duracion de menos de 30 dias en la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Lozano L, A. [Comision Federal de Electricidad, Central Laguna Verde, Subgerencia General de Operacion Planeacion, Veracruz (Mexico)]. e-mail: agustin.lozano@cfe.gob.mx

    2007-07-01

    The Laguna Verde Central having established as mission 'With maximum priority in the safety, to generate electricity by nuclear means with quality and cost competitive, sustained in our personnel's continuous overcoming and deep respect to the environment' and respecting our values (safety, responsibility by results, professional integrity, continuous improving, team working, excellence in the acting, quality of service, protection to the environment) they thought about our strategic objectives of the power station being born this way one of them that it is the program of improvement 'Reduction of reload times' looking for to be improves every day comparing us with the best plants in the world efficient all the processes in the power station that allowed us to measure our acting with the same parameters that settle down at international level like they are nuclear safety, industrial safety, radiological safety, capacity factor, readiness factor, cleaning of the power station attachment to procedures, attention to the detail and certainly to be competitive in the economic aspect. After analyzing the acting record of the power station, evaluating our technical capacity, economic, the location of the installation besides revising the international experiences it was defined that one of the concepts that impact considerably so much to the capacity and readiness factors besides the dose and production cost is the duration of the reload periods, for this reason they were elaborated work strategies to be able to reach our goal of reload days considered in being able to carry out them in less than 30 days, here the actions carried out that they made us complete the three last reloads in less than 30 days are captured. (Author)

  5. Four stops of fuel reloading with duration of less of 30 days in the Laguna Verde Central; Cuatro paradas de recarga de combustible con duracion de menos de 30 dias en la central laguna verde

    Energy Technology Data Exchange (ETDEWEB)

    Lozano L, A. [CFE, Central Laguna Verde, Planeacion, Veracruz (Mexico)]. e-mail: agustin.lozano@cfe.gob.mx

    2008-07-01

    The Laguna Verde Central having established as mission 'With maximum priority in the safety, to generate electricity by nuclear means with competitive quality and cost, sustained in our personnel's continuous overcoming and deep respect to the environment' and respecting our values (safety, responsibility by results, professional integrity, continuous improvement, team work, excellence in the performance, quality of service, protection to the environment its thought about our strategic objectives of the power station being born by this way one of them that it is the improvement program 'reduction of reloading times' looking for to be improves every day comparing us with the best plants of the world effectiveness all the processes in the power station that allowed us to measure our performance with the same parameters that settle down at international level as its are nuclear safety, industrial safety, radiological safety, capacity factor, readiness factor, cleaning of the power station attachment to procedures, attention to the detail and certainly to be competitive in the economic aspect. After analyzing the performance record of the power station, evaluating our technical, economic capacity, the location of the installation besides revising the international experiences was defined that one of the concepts that impact considerably so much to the capacity factors and readiness besides the dose and production cost is the duration of the reloading periods, for this reason work strategies were elaborated to be able to reach our goals of reloading days in less than 30 days, here are formed the carried out actions that they made us complete the four last reloading in less than 30 days. (Author)

  6. Perspectives of the central Laguna Verde after Fukushima for the period 2012 at the 2015 in operation and maintenance; Perspectivas de la central Laguna Verde despues de Fukushima para el periodo 2012 al 2015 en operacion y mantenimiento

    Energy Technology Data Exchange (ETDEWEB)

    Rivera C, A., E-mail: arr99999@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Veracruz (Mexico)

    2012-10-15

    The Nuclear Power Plants Management of the Federal Commission of Electricity in Mexico by means an internal analysis confronts the threat to the nuclear industry of the event of Fukushima that affected the public opinion, and the emission of new regulations. This situation demands to improve the results of the operation and maintenance of the nuclear power plant of Laguna Verde, to contribute value with their excellence in the acting to the nuclear option in Mexico. The internal analysis defined with clarity the perspectives based on weaknesses and strengths of the operation (monitoring and control of on-line parameters), and in the maintenance (sustained by the planning), enriched with the external experiences emitted by the institutes INPO and WANO for the nuclear industry, with all this strategic objectives 2012 to 2015 were presented and the initiatives as the extension of the useful life to 20 years more, as well as the focused actions to diminish the threat that the event of Fukushima influenced negatively in the public opinion, by means the diffusion of the good results that can be obtained in the nuclear power plant of Laguna Verde between 2012 and 2015, taking advantage of its modernized power of 810 MW-hour for each generating unit, doing visible that the Project of Extended Power Increase is a generation reality of 120% of the original value, to be able to enter at the excellence levels of the nuclear world. (Author)

  7. Analysis of internal events for the Unit 1 of the Laguna Verde Nuclear Power Station. Appendixes; Analisis de eventos internos para la Unidad 1 de la Central Nucleoelectrica de Laguna Verde. Apendices

    Energy Technology Data Exchange (ETDEWEB)

    Huerta B, A.; Lopez M, R. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1995-07-01

    This volume contains the appendices for the accident sequences analysis for those internally initiated events for Laguna Verde Unit 1, Nuclear Power Plant. The appendix A presents the comments raised by the Sandia National Laboratories technical staff as a result of the review of the Internal Event Analysis for Laguna Verde Unit 1 Nuclear Power Plant. This review was performed during a joint Sandia/CNSNS multi-day meeting by the end 1992. Also included is a brief evaluation on the applicability of these comments to the present study. The appendix B presents the fault tree models printed for each of the systems included and.analyzed in the Internal Event Analysis for LVNPP. The appendice C presents the outputs of the TEMAC code, used for the cuantification of the dominant accident sequences as well as for the final core damage evaluation. (Author)

  8. Analysis of internal events for the Unit 1 of the Laguna Verde Nuclear Power Station. Appendixes; Analisis de eventos internos para la Unidad 1 de la Central Nucleoelectrica de Laguna Verde. Apendices

    Energy Technology Data Exchange (ETDEWEB)

    Huerta B, A.; Lopez M, R. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1995-07-01

    This volume contains the appendices for the accident sequences analysis for those internally initiated events for Laguna Verde Unit 1, Nuclear Power Plant. The appendix A presents the comments raised by the Sandia National Laboratories technical staff as a result of the review of the Internal Event Analysis for Laguna Verde Unit 1 Nuclear Power Plant. This review was performed during a joint Sandia/CNSNS multi-day meeting by the end 1992. Also included is a brief evaluation on the applicability of these comments to the present study. The appendix B presents the fault tree models printed for each of the systems included and analyzed in the Internal Event Analysis for LVNPP. The appendice C presents the outputs of the TEMAC code, used for the cuantification of the dominant accident sequences as well as for the final core damage evaluation. (Author)

  9. Seismic qualification tests of fans of the NPP of Laguna Verde U-1 and U-2; Pruebas de calificacion sismica de ventiladores de la Central Laguna Verde U1 and U2

    Energy Technology Data Exchange (ETDEWEB)

    Jarvio C, G.; Garcia H, E. E.; Arguelles F, R.; Vela H, A. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Naranjo U, J. L., E-mail: gilberto.jarvio@inin.gob.mx [Comision Federal de Electricidad, Gerencia de Centrales Nucleoelectricas, Subgerencia de Ingenieria, Carretera Veracruz-Medellin Km 7.5, Dos Bocas, Veracruz (Mexico)

    2013-10-15

    This work presents the results of the seismic qualification tests applied to the fans that will be installed in the control panels of the three divisions of the diesel generators of the nuclear power plant (NPP) of Laguna Verde, Unit-1 and Unit-2. This seismic qualification process of the fans was carried out using two specimens that were tested in the seismic table (vibrating) of the Engineering Institute of Universidad Nacional Autonoma de Mexico (UNAM), in accordance with the requirements of the standard IEEE 344-1975, to satisfy the established requirements of seismic qualification in the technical specifications and normative documents required by the nuclear standards, in order to demonstrate its application in the diesel generators Divisions I, II and III of the NPP. The seismic qualification tests were developed on specimens that were retired of the NPP of Laguna Verde recently with a service life of 7.75 years. (Author)

  10. Internal event analysis of Laguna Verde Unit 1 Nuclear Power Plant. System Analysis; Analisis de Eventos Internos para la Unidad 1 de la Central Nucleoelectrica de Laguna Verde. Analisis de sistemas

    Energy Technology Data Exchange (ETDEWEB)

    Huerta B, A.; Aguilar T, O.; Nunez C, A.; Lopez M, R. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1993-07-01

    The Level 1 results of Laguna Verde Nuclear Power Plant PRA are presented in the {sup I}nternal Event Analysis of Laguna Verde Unit 1 Nuclear Power Plant{sup ,} CNSNS-TR-004, in five volumes. The reports are organized as follows: CNSNS-TR-004 Volume 1: Introduction and Methodology. CNSNS-TR-004 Volume 2: Initiating Event and Accident Sequences. CNSNS-TR-004 Volume 3: System Analysis. CNSNS-TR-004 Volume 4: Accident Sequence Quantification and Results. CNSNS-TR-004 Volume 5: Appendices A, B and C. This volume presents the results of the system analysis for the Laguna Verde Unit 1 Nuclear Power Plant. The system analysis involved the development of logical models for all the systems included in the accident sequence event tree headings, and for all the support systems required to operate the front line systems. For the Internal Event analysis for Laguna Verde, 16 front line systems and 5 support systems were included. Detailed fault trees were developed for most of the important systems. Simplified fault trees focusing on major faults were constructed for those systems that can be adequately represent,ed using this kind of modeling. For those systems where fault tree models were not constructed, actual data were used to represent the dominant failures of the systems. The main failures included in the fault trees are hardware failures, test and maintenance unavailabilities, common cause failures, and human errors. The SETS and TEMAC codes were used to perform the qualitative and quantitative fault tree analyses. (Author)

  11. Radiological analysis by the addition of hydrogen and noble metals in the reactors of the Laguna Verde central; Analisis radiologico por la adicion de hidrogeno y metales nobles en los reactores de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Padilla C, I. [CFE, Proteccion Radiologica (Mexico)]. e-mail: ipadilla@cfe.gob.mx

    2006-07-01

    and of the radiological behavior when applying them, its allowed to settle down strategies in the Laguna Verde Central to control and to reduce the magnitude of the radiological increment in the primary steam lines in both units during the initial period of application. The radiological effects by the addition of hydrogen and of the noble metals, and its incorporation sequence to the reactor are the one reason of this work. (Author)

  12. Out of operation in simultaneous way of the two reactors of nucleoelectric central of Laguna Verde(Mexico); Fuera de operacion, de maneira simultanea, los dos reactores de la central nucleoelectrica de Laguna Verde (Mexico)

    Energy Technology Data Exchange (ETDEWEB)

    Mar, Bernardo Salas, E-mail: salasmarb@yahoo.com.mx [Universidad Nacional Autonoma de Mexico, D.F. (Mexico). Facultad de Ciencias. Departamento de Fisica

    2013-11-01

    The two nuclear reactors that Mexico has in the Laguna Verde Nuclear Power Plant, were out of operation simultaneously in September 2012. First it was reported that one of the reactors had problems with the diesel generator, while the other had problems with the nuclear fuel reloading. The day after it was reported a problem related to sediment in the Obra de Toma, place the plant feeds seawater to cool the condenser the depth to which it must operate is 6 meters, with the current level of 1.5 meters, causing a lack of cooling water. Finally it was reported the cause of the suspension of operations, the cracks in jet pumps in both reactors. It is described a brief analysis of these opinions. The reactors are of cooling water of General Electric (BWR-5) and generate 1640 MWe each one.

  13. Internal event analysis for Laguna Verde Unit 1 Nuclear Power Plant. Accident sequence quantification and results; Analisis de eventos internos para la Unidad 1 de la Central Nucleoelectrica de Laguna Verde. Cuantificacion de secuencias de accidente y resultados

    Energy Technology Data Exchange (ETDEWEB)

    Huerta B, A.; Aguilar T, O.; Nunez C, A.; Lopez M, R. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1994-07-01

    The Level 1 results of Laguna Verde Nuclear Power Plant PRA are presented in the {sup I}nternal Event Analysis for Laguna Verde Unit 1 Nuclear Power Plant, CNSNS-TR 004, in five volumes. The reports are organized as follows: CNSNS-TR 004 Volume 1: Introduction and Methodology. CNSNS-TR4 Volume 2: Initiating Event and Accident Sequences. CNSNS-TR 004 Volume 3: System Analysis. CNSNS-TR 004 Volume 4: Accident Sequence Quantification and Results. CNSNS-TR 005 Volume 5: Appendices A, B and C. This volume presents the development of the dependent failure analysis, the treatment of the support system dependencies, the identification of the shared-components dependencies, and the treatment of the common cause failure. It is also presented the identification of the main human actions considered along with the possible recovery actions included. The development of the data base and the assumptions and limitations in the data base are also described in this volume. The accident sequences quantification process and the resolution of the core vulnerable sequences are presented. In this volume, the source and treatment of uncertainties associated with failure rates, component unavailabilities, initiating event frequencies, and human error probabilities are also presented. Finally, the main results and conclusions for the Internal Event Analysis for Laguna Verde Nuclear Power Plant are presented. The total core damage frequency calculated is 9.03x 10-5 per year for internal events. The most dominant accident sequences found are the transients involving the loss of offsite power, the station blackout accidents, and the anticipated transients without SCRAM (ATWS). (Author)

  14. Introduction of fuel GE14 in the nuclear power plant of Laguna Verde for the extended increase of power; Introduccion del combustible GE14 en la central nuclear Laguna Verde para el aumento de potencia extendido

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez M, N.; Vargas A, A. F.; Cardenas J, J. B.; Contreras C, P. [CFE, Central Nuclear Laguna Verde, Subgerencia de Ingenieria, Carretera Veracruz-Medellin Km. 7.5 (Mexico)]. e-mail: natividad.hernandez@cfe.gob.mx

    2008-07-01

    The project of extended increase of power responds to a necessity of electrical energy in the country, increasing the thermal exit of the reactors of the nuclear power plant of Laguna Verde of 2027 MWt to 2317 MWt. In order to support this transition, changes will make in the configuration of the reactor core and in the operation strategies of the cycle, also they will take initiatives to optimize the economy in fuel cycle. At present in both reactors of the nuclear plant of Laguna Verde fuel GE12 is used. The fuel GE14 presents displays with respect to the GE12, some improvements in the mechanical design and consequently in its performance generally. Between these improvements we can mention: 1. Spacers of high performance. 2. Shielding with barrier. 3. Filter for sweepings {sup d}ebris{sup a}nd 4. Fuel rods of minor partial length. The management of nuclear power plants has decided to introduce the use of fuel GE14 in Laguna Verde in the reload 14 for Unit 1 and of the reload 10 for Unit 2. The process of new introduction fuel GE14 consists of two stages, first consists on subjecting the one new design of fuel to the regulator organism in the USA: Nuclear Regulatory Commission, in Mexico the design must be analyzed and authorized by the National Commission of Nuclear Safety and Safeguards, for its approval of generic form, by means of the demonstration of the fulfillment with the amendment 22 of GESTAR II, the second stage includes the specific analyses of plant to justify the use of the new fuel design in a reload core. The nuclear plant of Laguna Verde would use some of the results of the security analyses that have been realized for the project of extended increase of power with fuel GE14, to document the specific analyses of plant with the new fuel design. The result of the analyses indicates that the reload lots are increased of 116-120 assemblies in present conditions (2027 MWt) to 140-148 assemblies in conditions of extended increase of power (2317 MWt

  15. Development of a methodology for the economical analysis of fuel cycles, application to the Laguna Verde central; Desarrollo de una metodologia para el analisis economico de ciclos de combustible, aplicacion a la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Malfavon, S.M.; Trejo, M.G.; Hernandez, H. [FI-UNAM, 04500 Mexico D.F. (Mexico); Francois, J.L.; Ortega, R.F. [FI-UNAM, Paseo Cuauhnahuac 8532, Jiutepec, Morelos (Mexico)

    2003-07-01

    In this work a methodology developed to carry out the economical analysis of the fuel cycle of a nuclear reactor is presented. The methodology was applied to the Laguna Verde Nuclear Power Station (CNLV). The design of the reload scenarios of the CNLV are made with the Core Master Presto code (CM-Presto), three-dimensional simulator of the reactor core, the launched data by this, as well as the information of the Energy use plan (PUE), it allowed us to obtain reliable results through the fitness of an algorithm of economic calculation that considers all the components of the fuel cycle to present worth. With the application of the methodology it was obtained the generated energy, as well as their respective cost of each sub lot type of assemblies by operation cycle, from the start-up of the CNLV until September 13, 2002. Using the present worth method its were moved all the values at November 5, 1988, date of operation beginning. To the final of the analysis an even cost of 6.188 mills/kWh was obtained for those first 9 cycles of the Unit 1 of the CNLV, being observed that the costs of those first 3 operation cycles are the more elevated. Considering only the values starting from the cycle 4, the levelled cost turns out to be of 5.96 mills/kWh. It was also obtained the cost by fuel lot to evaluate the performance of assemble with the same physical composition. (Author)

  16. First fuel reload in Laguna Verde; Primera recarga de combustible en Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Bahena B, D

    1992-01-15

    A report containing the activities carried out during the first reload of nuclear fuel and major maintenance in the Laguna Verde nuclear reactor is presented. The previous and the specific activities are included. These last are related without including the technical considerations, data or the operation details, because these data were documented inside the registrations of the CFE, the ININ and in personal way. (Author)

  17. Estimation of requirements of eolic energy equivalent to the electric generation of the Laguna Verde nuclear power plant; Estimacion de requerimientos de energia eolica equivalente a la generacion electrica de la Central Nucleoelectrica de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Garcia V, M.A.; Hernandez M, I.A. [Facultad de Ingenieria, Division de Ingenieria Electrica, UNAM, 04510 Mexico D.F. (Mexico)]. E-mail: maiki27@yahoo.com; Martin del Campo M, C. [Facultad de Ingenieria, Laboratorio de Analisis en Ingenieria de Reactores Nucleares, UNAM, Paseo Cuauhnahuac 8532, 62550 Jiutepec, Morelos (Mexico)

    2004-07-01

    The advantages are presented that have the nuclear and eolic energy as for their low environmental impact and to the human health. An exercise is presented in the one that is supposed that the electric power generated by the Laguna Verde Nuclear Power plant (CNLV), with capacity of 1365 M W, it should be produced by eolic energy when in the years 2020 and 2025 the units 1 and 2 of the CNLV reach its useful life and be moved away. It is calculated the number of aero generators that would produce the electric power average yearly of the CNLV, that which is equal to install eolic parks with capacity of 2758 M W, without considering that it will also be invested in systems of back generation to produce electricity when the aero generators stops for lack of wind. (Author)

  18. Analysis of internal events for the Unit 1 of the Laguna Verde nuclear power station; Analisis de eventos internos para la Unidad 1 de la Central Nucleolelectrica de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Huerta B, A.; Aguilar T, O.; Nunez C, A.; Lopez M, R. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    1993-07-01

    This volume presents the results of the starter event analysis and the event tree analysis for the Unit 1 of the Laguna Verde nuclear power station. The starter event analysis includes the identification of all those internal events which cause a disturbance to the normal operation of the power station and require mitigation. Those called external events stay beyond the reach of this study. For the analysis of the Laguna Verde power station eight transient categories were identified, three categories of loss of coolant accidents (LOCA) inside the container, a LOCA out of the primary container, as well as the vessel break. The event trees analysis involves the development of the possible accident sequences for each category of starter events. Events trees by systems for the different types of LOCA and for all the transients were constructed. It was constructed the event tree for the total loss of alternating current, which represents an extension of the event tree for the loss of external power transient. Also the event tree by systems for the anticipated transients without scram was developed (ATWS). The events trees for the accident sequences includes the sequences evaluation with vulnerable nucleus, that is to say those sequences in which it is had an adequate cooling of nucleus but the remoting systems of residual heat had failed. In order to model adequately the previous, headings were added to the event tree for developing the sequences until the point where be solved the nucleus state. This process includes: the determination of the failure pressure of the primary container, the evaluation of the environment generated in the reactor building as result of the container failure or cracked of itself, the determination of the localization of the components in the reactor building and the construction of boolean expressions to estimate the failure of the subordinated components to an severe environment. (Author)

  19. Development of an interactive model of the Laguna Verde nuclear power plant based on the RELAP/SCDAP code; Desarrollo del modelo interactivo de la central nucleoelectrica de Laguna Verde basado en el codigo RELAP/SCDAP

    Energy Technology Data Exchange (ETDEWEB)

    Salazar C, J.H.; Ramos P, J.C.; Salazar S, E.; Chavez M, C. [LAIRN, FI-UNAM, DEPFI Campus Morelos, Jiutepec, Morelos (Mexico)]. e-mail: cchavez2@cableonline.com.mx

    2003-07-01

    The present work describes the development of an interactive model of the Nuclear power plant of Laguna Verde (CNLV) based on the RELAP/SCDAP nuclear code, and it incorporation to a classroom simulator. The functional prototype it allows to make evaluations for operational transients and postulates accidents, with capacitation purposes, training, analysis and design. It emphasizes on the methodology used to establish the inter activity. Such methodology, is based on a modular structure in the one that multiple processes can be executed in an independent way and where the generated information is stored in segments of shared memory (characteristic that allows the UNIX operating system) and sent to the different processes by means of communication routines developed in C programming language. The utility of the system is demonstrated by means of the use of interactive display graphics (mimic diagrams, pictorials and tendency graphics) for the simultaneous dynamic visualization of the variables more significant that involve to the pattern of a transitory event type (for example failure of the controller of feeding water in a BWR reactor). Near with the interactive module, it was developed a model of the reactor of the CNLV for the code of better estimation RELAP/SCDAP. Finally the evaluation of the model is described, where it is interpreted in general form the behavior of those main variables that describe the stationary state, corroborating that follow the same tendency that those reported in the FSAR (Final Safety Analysis Report) of the Laguna Verde plant. The obtained results allow to conclude that the made development was satisfactory and that it presents enormous advantages regarding the capacity and time of analysis when using tools of visualization in real time of execution. (Author)

  20. Technological evaluation for the extension of the operation license to the nuclear power plant of Laguna Verde; Evaluacion tecnologica para la extension de la licencia de operacion de la Central Nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Arganis J, C. R.; Medina A, A. L., E-mail: carlos.arganis@inin.gob.m [ININ, Departamento de Tecnologia de Materiales, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2010-07-01

    At the present time one of the tendencies in the nuclear industry is the renovation of operation licenses of the nuclear power plants, with the purpose of prolonging their operation 20 years more than the time settled down in their original license, which is of 30 years for the case of the nuclear power plant of Laguna Verde. This allows the electric power generation for a major period of time and to a relatively low price, giving this way a bigger competitiveness to the power stations of nuclear power. However, to request the license extension of the nuclear power plant requires to get ready the documentation and necessary studies for: to maintain a high level of security, to optimize the operation, maintenance and service life of the structures, systems and components, to maintain an acceptable level of performance, to maximize the recovery of the investment about the service of the nuclear power plant and to preserve the sure conditions for a major operation period at the license time. This paper describes the studies conducted by the Materials Technology Department of the Instituto Nacional de Investigaciones Nucleares (ININ) to substantiate the required documentation for obtaining the extension of operating license of the nuclear power plant. These studies are focused mainly in the reactor pressure vessels of both units, as well as in the deposit of noble metals and the influence of the sludges (crud s) in this deposit. (Author)

  1. Experiences in the implementation of the Coaching project in the nuclear power plant of Laguna Verde (NPP-L V); Experiencias en la implementacion del proyecto Coaching en la Central Nucleoelectrica Laguna Verde (CNLV)

    Energy Technology Data Exchange (ETDEWEB)

    Mendez M, H. I., E-mail: hugo.mendez01@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Departamento del Centro de Entrenamiento, Carretera Cardel-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2012-10-15

    This document has the purpose of to share acquired experiences during the implementation of the Coaching project focused the training of supervisors and directive personnel of the nuclear power plant of Laguna Verde (NPP-L V). Derived of the improvement areas identified by the supervisor organization of the nuclear power stations WANO (World Association Nuclear of Operators) and of the auto-evaluations realized by the expert personnel of the same power station that based on external experiences carried out through the Benchmarking (comparison with other power stations) they have reflected the necessity to activate a training process in Coaching with a practical focus toward the directive and supervisor personnel in the power station. By means of the observation of the personnel's acting so much in the control rooms like in different areas, three focus areas have been identified for the training in Coaching, these are the personnel's motivation, the organizational communication so much in vertical form as horizontal and the perception of confidence lack among directive, supervisors, operators and technicians. The plan focused in the abilities training of Coaching with practical sense was development, supported with an evaluation of 360 grades as tool of competitions development through a computer application e-Coaching. The use of application and Coaching following techniques facilitated the conformation of the practical focus, same that are of continuous use starting from the training of the supervisor and directive personnel. (Author)

  2. Evaluation of radwaste minimization program of dry and wet active waste in the Laguna Verde Nuclear Power Plant; Evolucion del programa de minimizacion de desechos solidos secos y humedos en la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Luna-Garza, Hector [Comision Federal de Electricidad, Veracruz (Mexico). Central Nucleoeletrica Laguna Verde; Zarate-Montoya, Norma [Instituto Nacional de Investigaciones Nucleares, Veracruz (Mexico)

    2001-07-01

    A growing rate of radwaste volume production combined with an increase of both, costs and associated dose involved in its treatment and disposition processes have created a serious problem to the Laguna Verde Nuclear Power Plant (BWR, two Units, 682 Mwe each) in Mexico. Due the lack of a Final Repository in the country, the solution in the short or long terms relies on the success of a continuous and aggressive minimization program mainly based on modifications and upgrades applied to these processes. Technical and administrative strategies adopted by LVNPP for the reduction of Liquid Effluents and Dry and Wet Active Waste in the next three years are described. Based on the results of the LVNPP current radwaste process systems, an estimated accumulation of 11,502 m{sup 3} by the year 2035 will exceed the actual on-site storage capacity. If the strategies succeed, this production would fall to an expected manageable volume of 4067 m{sup 3}. (author)

  3. Analysis of a natural draught tower in the circulation seawater system of nuclear power plant of Laguna Verde; Analisis de una torre de tiro natural en el sistema de agua de circulacion de mar de la central nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Tijerina S, F.; Vargas A, A. [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Carretera Veracruz-Medellin Km. 7.5, Veracruz (Mexico)], e-mail: francisco.tijerina@cfe.gob.mx

    2009-10-15

    The analysis of a natural draught tower in open circuit for the cooling system of seawater circulation on the nuclear power plant of Laguna Verde, it is based on conditions of 2027 MWt and 2317 MWt, where the flows of circulation water system hardly vary and whose purpose will be, to cool the seawater circulation. The circulation water system is used as heat drain in main condenser of turbo generator to condense the nuclear vapor. The annual average temperature in the seawater at present is of 26 C to the entrance to circulation water system and it is vary in accordance with the time of year. The mean temperature of leaving of circulation water system to the sea is of 41 C. Having a cooling tower to reduce the entrance temperature to the circulation water system, it improves the efficiency of thermal transfer in condenser, it improves the vacuum in condenser giving more operative margin to avoid condenser losses by air entrances and nuclear power plant shutdowns, as well as for to improve the efficiency of operative balance of nuclear power plant, also it prevents the impact in thermal transfer efficiency in condenser by the climatic change. (Author)

  4. Feasibility analysis in the expansion proposal of the nuclear power plant Laguna Verde: application of real options, binomial model; Analisis de viabilidad en la propuesta de expansion de la central nucleoelectrica Laguna Verde: aplicacion de opciones reales, modelo binomial

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez I, S.; Ortiz C, E.; Chavez M, C., E-mail: lunitza@gmail.com [UNAM, Facultad de Ingenieria, Circuito Interior, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2011-11-15

    At the present time, is an unquestionable fact that the nuclear electrical energy is a topic of vital importance, no more because eliminates the dependence of the hydrocarbons and is friendly with the environment, but because is also a sure and reliable energy source, and represents a viable alternative before the claims in the growing demand of electricity in Mexico. Before this panorama, was intended several scenarios to elevate the capacity of electric generation of nuclear origin with a variable participation. One of the contemplated scenarios is represented by the expansion project of the nuclear power plant Laguna Verde through the addition of a third reactor that serves as detonator of an integral program that proposes the installation of more nuclear reactors in the country. Before this possible scenario, the Federal Commission of Electricity like responsible organism of supplying energy to the population should have tools that offer it the flexibility to be adapted to the possible changes that will be presented along the project and also gives a value to the risk to future. The methodology denominated Real Options, Binomial model was proposed as an evaluation tool that allows to quantify the value of the expansion proposal, demonstrating the feasibility of the project through a periodic visualization of their evolution, all with the objective of supplying a financial analysis that serves as base and justification before the evident apogee of the nuclear energy that will be presented in future years. (Author)

  5. Temporary storage in dry of the spent nuclear fuel in the Nuclear Power Plant of Laguna Verde; Almacenamiento temporal en seco del combustible nuclear gastado en la Central Nuclear Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez M, N.; Vargas A, A., E-mail: natividad.hernandez@cfe.gob.mx [Comision Federal de Electricidad, Gerencia de Centrales Nucleoelectricas, Carretera Veracruz-Medellin Km. 7.5, 94270 Dos Bocas, Veracruz (Mexico)

    2013-10-15

    To guarantee the continuity in the operation of the two nuclear reactors of the nuclear power plant of Laguna Verde (NPP-L V) is an activity of high priority of the Comision Federal de Electricidad (CFE) in Mexico. At the present time, the CFE is working in the storage project in dry of the spent fuel with the purpose of to liberate space of the pools and to have the enlarged capacity of storage of the spent fuel that is discharged of the reactors. This work presents the storage option in dry of the spent fuel, considering that the original capacity of the spent fuel pools of the NPP-L V was of 1242 spaces each one and that in 1991, through a modification of the original design, the storage capacity was increased to 3177 spaces by pool. At present, the cells occupied by unit are of 2165 (68%) for the Unit-I and 1839 (58%) for the Unit-2, however, in 2017 and 2022 the capacity to discharge the complete core will be limited by what is required of a retirement option of spent fuel assemblies to liberate spaces. (author)

  6. Questions to the reactors power upgrade of the Nuclear Power Plant of Laguna Verde; Cuestionamientos al aumento de potencia de los reactores de la Central Nuclear de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Salas M, B., E-mail: salasmarb@yahoo.com.mx [UNAM, Facultad de Ciencias, Departamento de Fisica, Circuito exterior s/n, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2014-08-15

    The two reactors of the Nuclear Power Plant of Laguna Verde (NPP-L V) were subjected to power upgrade labors with the purpose of achieving 20% upgrade on the original power; these labors concluded in August 24, 2010 for the Reactor 1 and in January 16, 2011 for the Reactor 2, however in January of 2014, the NNP-L V has not received by part of the Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS) the new Operation License to be able to work with the new power, because it does not fulfill all the necessary requirements of safety. In this work is presented and analyzed the information obtained in this respect, with data provided by the Instituto Federal de Acceso a la Informacion Publica y Proteccion de Datos (IFAI) and the Comision Federal de Electricidad (CFE) in Mexico, as well as the opinion of some workers of the NPP-L V. The Governing Board of the CFE announcement that will give special continuation to the behavior on the operation and reliability of the NPP-L V, because the frequency of not announced interruptions was increased 7 times more in the last three years. (Author)

  7. Study of environmental noise in a BWR plant like the Nuclear Power Plant Laguna Verde; Estudio de ruido ambiental en una planta BWR como la Central Nuclear Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Tijerina S, F.; Cruz G, M.; Amador C, C., E-mail: francisco.tijerina@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Carretera Cardel-Nautla Km. 42.5, Alto Lucero, Veracruz (Mexico)

    2013-10-15

    In all industry type the health costs generated by the noise are high, because the noise can cause nuisance and to harm the capacity to work when causing tension and to perturb the concentration, and in more severe cases to reach to lose the sense of the hearing in the long term. The noise levels in the industry have been designated for the different types of use like residential, commercial, and industrial and silence areas. The noise can cause accidents when obstructing the communications and alarm signs. For this reason the noise should be controlled and mitigated, at a low level as reasonably is possible, taking into account that the noise is an acoustic contamination. The present study determines a bases line of the environmental noise levels in a nuclear power plant BWR-5 as Laguna Verde, (like reference) to be able to determine and to give pursuit to the possible solutions to eliminate or to limit the noise level in the different job areas. The noise levels were registered with a meter of integrative noise level (sonometer) and areas of noise exposure levels mapping the general areas in the buildings were established, being the registered maximum level of 96.94 dba in the building of the Reactor-elevation 0.65 m under the operation conditions of Extended Power Up rate (EPU) of 120% PTN. Knowing that the exposition to noises and the noise dose in the job place can influence in the health and in the safety of the workers, are extensive topics that they should be analyzed for separate as they are: to) the effects in the health of the exposure to the noise, b) how measuring the noise, c) the methods and technologies to combat and to control the noise in the industry by part of engineering area and d) the function of the industrial safety bodies as delegates of the health and safety in the task against the noise in the job. (author)

  8. Technical and economic proposal for the extension of the Laguna Verde Nuclear Power plant with an additional nuclear reactor; Propuesta tecnica y economica para la ampliacion de la Central Nucleoelectrica Laguna Verde con un reactor nuclear adicional

    Energy Technology Data Exchange (ETDEWEB)

    Leal C, C.D.; Francois L, J.L. [Facultad de Ingenieria, UNAM, Circuito Interior, C.U. Coyoacan, 04510 Mexico D.F. (Mexico)]. e-mail: carlosdanielleal@yahoo.com.mx

    2006-07-01

    The increment of the human activities in the industrial environments and of generation of electric power, through it burns it of fossil fuels, has brought as consequence an increase in the atmospheric concentrations of the calls greenhouse effect gases and, these in turn, serious repercussions about the environment and the quality of the alive beings life. The recent concern for the environment has provoked that industrialized countries and not industrialized carry out international agreements to mitigate the emission from these gases to the atmosphere. Our country, like part of the international community, not is exempt of this problem for what is necessary that programs begin guided toward the preservation of the environment. As for the electric power generation, it is indispensable to diversify the sources of primary energy; first, to knock down the dependence of the hydrocarbons and, second, to reduce the emission of polluting gases to the atmosphere. In this item, the nucleo electric energy not only has proven to be safe and competitive technical and economically, able to generate big quantities of electric power with a high plant factor and a considerable cost, but rather also, it is one of the energy sources that less pollutants it emits to the atmosphere. The main object of this work is to carry out a technical and economic proposal of the extension of the Laguna Verde Nuclear power plant (CNLV) with a new nuclear reactor of type A BWR (Advanced Boiling Water Reactor), evolutionary design of the BWR technology to which belong the two reactors installed at the moment in the plant, with the purpose of increasing the installed capacity of generation of the CNLV and of the Federal Commission of Electricity (CFE) with foundation in the sustainable development and guaranteeing the protection of the environment by means of the exploitation of a clean and sure technology that counts at the moment with around 12,000 year-reactor of operational experience in more of

  9. Methodology of aging management in structures, systems and components of a nuclear power plant and its application to a pilot program in Laguna Verde; Metodologia de la gestion del envejecimiento en estructuras, sistemas y componentes de una central nuclear y su aplicacion a un programa piloto en Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Jarvio C, G. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Fernandez S, G. [Comision Federal de Electricidad, Gerencia de Centrales Nucleoelectricas, Subgerencia de Ingenieria, Carretera Veracruz-Medellin Km. 7.5, Dos Bocas, 54270 Veracruz (Mexico)], e-mail: gfdezs@cfe.gob.mx

    2009-10-15

    From its origin the nuclear power plants confront the effects of time and of environment, giving as result the aging of its structures, systems and components. In this document the general process is described for the establishment of Aging Management Program developed by IAEA. Following the program methodology is guaranteed that a nuclear power plant manages the aging effects appropriately and to make decisions for its solution, assuring the characteristic functions of structures, systems and components of same nuclear power plant. On the other hand, the implantation of an aging management program constitutes the base for development of a licence renovation program, like it can be the specific case of the Central Laguna Verde Units 1 and 2. (Author)

  10. Laguna Verde after the extended power increase; Laguna Verde despues del aumento de potencia extendido

    Energy Technology Data Exchange (ETDEWEB)

    Herrera C, M. N.; Castaneda G, M. A.; Cardenas J, J. B.; Garcia de la C, F. M., E-mail: mitzi.herrera@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2012-10-15

    The project of extended power increase that was implemented in both units of the nuclear power plant of Laguna Verde beginning with the stage feasibility evaluation in nuclear side of the facilities, that is to say the affectation of the power increase in the equipment s, systems and components of the nuclear power plant; besides the feasibility evaluation a study cost-benefit for the rehabilitated and modernization of the equipment s, systems and components of Plant Balance was realized. Once considered technical and economically feasible the project began the engineering evaluations required to carry out the licensing of the new operation conditions, as well as beginning to the elaboration of the technical specifications purchase of the equipment s, systems and components of the Plant Balance. While on one hand was carried out the administration of the licensing of the extended power increase for other was carried out the necessary engineering to make the physical changes in the conventional side of the nuclear power plant. Once concluded the constructive stage beginning the final stage of the project, the starting-up tests, operation and performance of the Units under the new operation conditions. This work describes this last stage that contains the technical base, the realized tests and the obtained results. (Author)

  11. Modernization of the Electric Power Systems (transformers, rods and switches) in the Laguna Verde Nuclear Power Plant (Mexico); Modernizacion de los Sistemas Electricos de Potencia (Transformadores de Principales, Interruptor de Generacion, Barras de Fase Aislada) de la Central Nuclear de Laguna Verde (Mexico)

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Solarzano, J. J.; Gabaldon Martin, M. A.; Pallisa Nunez, J.; Florez Ordeonez, A.; Fernandez Corbeira, A.; Prieto Diez, I.

    2010-07-01

    Description of the changes made in the Electric Power Systems as a part of the power increase project in the Laguna Verde Nuclear Power Plant (Mexico). The main electrical changes to make, besides the turbo group, are the main generation transformers, the isolated rods and the generation switch.

  12. Components production and assemble of the irradiation capsule of the Surveillance Program of Materials of the nuclear power plant of Laguna Verde;Fabricacion de componentes y ensamble de la capsula de irradiacion del Programa de Vigilancia de Materiales de la central nuclear Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Medrano, A. [ININ, Departamento de Tecnologia de Materiales, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2009-07-01

    To predict the effects of the neutrons radiation and the thermal environment about the mechanical properties of the reactor vessel materials of the nuclear power plant of Laguna Verde, a surveillance program is implemented according to the outlines settled by Astm E185-02 -Standard practice for design of surveillance programs for light-water moderated nuclear power reactor vessels-. This program includes the installation of three irradiation capsules of similar materials to those of the reactor vessels, these samples are test tubes for mechanical practices of impact and tension. In the National Institute of Nuclear Research and due to the infrastructure as well as of the actual human resources of the Pilot Plant of Nuclear Fuel Assembles Production it was possible to realize the materials rebuilding extracted in 2005 of Unit 2 of nuclear power plant of Laguna Verde as well as the production, assemble and reassignment of the irradiation capsule made in 2006. At the present time the surveillance materials extracted in 2008 of Unit 1 of the nuclear power plant of Laguna Verde are reconstituting and the components are manufactured for the assembles of the irradiation capsule that will be reinstalled in the reactor vessel in 2010. The purpose of the present work is to describe the necessary components as well as its disposition during the assembles of the irradiation capsule for the surveillance program of the reactors vessel of the nuclear power plant of Laguna Verde. (Author)

  13. Core reactor simulation of the Central Laguna Verde (CLV) reactor in stationary state and an example of the application in the recharge options analysis of cycle 3; Simulacion del nucleo del reactor de la Central Laguna Verde (CLV) en estado estacionario y ejemplo de aplicacion en el analisis de alternativas de recarga del ciclo 3

    Energy Technology Data Exchange (ETDEWEB)

    Ocampo Mansilla, Hector; Francois Lacouture, Juan Luis; Blanco Lara, Jesus; Cortes Campos, Carlos Cristobal; Esquivias Montoya, Jesus; Esquivel Torres, Jose Luis; Martin del Campo Marquez, Cecilia [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Montes Tadeo, Jose Luis [Instituto Nacional de Investigaciones Nucleares (ININ), Salazar (Mexico); Sanchez Herrera, Luciano; Torres Alvarez, Carlos [Comision Federal de Electricidad (CFE), Mexico, D. F. (Mexico)

    1991-12-31

    The results are presented of a study requested by Comision Federal de Electricidad (CFE) for the analysis of Cycle 3, of Unit No. 1 of the Laguna Verde Nuclear Power Station (CLNV) and determine the burning effect impact, carried out with the starting tests and the operation of Cycles 1 and 2 on base of the cycle extension known as coastdown. The calculations were realized with the Code Package FMS for fuel managing, using the Code PRESTO-B that analyzes the reactor in detailed form in three dimensions an in stationary state. In the study the schemes of fraction of recharge proposed by General Electric (GE) were analyzed with the effect of cycle extension. The initial design value of 100 assemblies for Cycle 3, GE proposes to increase such fraction from 112 to 120 assemblies. This impacts the cost of the second recharge and the purpose of this investigation is to analyze options with higher fuel enrichment in U-235 to minimize the number of assemblies in this recharge. The analyses effected show that the designs proposed by GE do not fulfill the required energy proposed for the cycle, even using in the recharge only fuel with 3.03% of enrichment. It is proposed, likewise, the fuel enrichment up to 3.25% to satisfy the energy demand with a minimum of assemblies. [Espanol] Se presentan los resultados de un estudio solicitado por la Comision Federal de Electricidad (CFE) para analizar el ciclo 3, de la unidad 1 de la Central Laguna Verde (CLV), y determinar el impacto del efecto de quemado llevado a cabo con las pruebas de arranque y por la operacion de los ciclos 1 y 2 con base en la tecnica de alargamiento del ciclo conocida como coastdown1. Los calculos se realizaron con el paquete de codigos FMS para la administracion de combustible, usando el codigo PRESTO-B que analiza el reactor en forma detallada en tres dimensiones y en estado estacionario. Se analizaron en el estudio los esquemas de fraccion de recarga propuesta por la General Electric (GE) con el efecto de

  14. Laguna Verde BWRs operational experience: steady-state fuel performance

    Energy Technology Data Exchange (ETDEWEB)

    Cuevas V, G. F.; Bravo S, J. M. [Global Nuclear Fuel - Americas, 3901 Castle Hayne Road, Wilmington, 28401 North Carolina (United States); Casillas, J. L., E-mail: gabriel.cuevas-vivas@gnf.co [General Electric Hitachi Nuclear Energy, 1989 Little Orchard St. Romm 239, San Jose, 95125 California (United States)

    2010-10-15

    The two BWR at Laguna Verde nuclear power station are finishing 21 and 15 years of continuous successful operation as of 2010. During Unit 1 and 2 commercial operations only Ge/GNF fuel designs have been employed; fuel lattice designs 8 x 8 and 10 x 10 were used at the reactor, with an original licensed thermal power (OLTP: 1931 MWt) and the reactor's first power up-rates of 5%. GNF fuel will be also used for the second EPU to reach 120% of OLTP in the near future. Thermal and gamma traversing in-core probes (Tip) are used for power monitoring purposes along with the Ge (now GNF-A) core monitoring system, 3-dimensional Monicore{sup TM}. GNF-A has also participated by preparing the core management plan that is regularly fine-tuned in collaboration with Comision Federal de Electricidad (CFE owner of the Laguna Verde reactors). For determination of thermal margins and eigenvalue prediction, GNF-A employs the NRC-licensed steady-state core simulator PANAC11. Tip comparisons are routinely used to adapt power distributions for a better thermal margin calculation. Over the years, several challenges have appeared in the near and long term fuel management planning such as increasing cycle length, optimization of the thermal margins, rated power increase, etc. Each challenge has been successfully overcome via operational strategy, code improvements and better fuel designs. This paper summarizes Laguna Verde Unit 1 and 2 steady-state performance from initial commercial operation, with a discussion of the nuclear and thermal-hydraulic design features, as well as of the operational strategies that set and interesting benchmark for future fuel applications, code development and operation of the BWRs. (Author)

  15. Antineutrino Flux from the Laguna Verde Nuclear Power Plant

    Directory of Open Access Journals (Sweden)

    Marisol Chavez-Estrada

    2015-01-01

    Full Text Available We present a calculation of the antineutrino flux produced by the reactors at the Laguna Verde Nuclear Power Plant in México, based on the antineutrino spectra produced in the decay chains of the fission fragments of the main isotopes in the reactor core, and their fission rates, which have been calculated using the DRAGON simulation code. We also present an estimate of the number of expected events in a detector made of plastic scintillator with a mass of 1 ton, at 100 m from the reactor cores.

  16. Antineutrino flux from the Laguna Verde Nuclear Power Plant

    CERN Document Server

    Chavez-Estrada, Marisol

    2015-01-01

    We present a a calculation of the antineutrino flux produced by the reactors at the Laguna Verde Nuclear Power Plant in M\\'exico, based on the antineutrino spectra produced in the decay chains of the fission fragments of the main isotopes in the reactor core, and their fission rates, that have been calculated using the DRAGON simulation code. We also present an estimate of the number of expected events in a detector made of plastic scintillator with a mass of 1 ton, at 100 m from the reactor cores.

  17. Changes in reactivity and in the margins to thermal limits by the inclusion of control rods of advanced type in the Laguna Verde Power plant; Cambios en la reactividad y en los margenes a limites termicos por la inclusion de barras de control de tipo avanzado en la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, J.L.; Perusquia, R.; Montes, J.L.; Ortiz, J.J.; Ramirez, J.R. [ININ, Depto. de Sistemas Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)]. E-mail: jlhm@nuclear.inin.mx

    2004-07-01

    The obtained results are presented when simulating with CM-PRESTO code the cycle 10 of the unit 1 of the Laguna Verde Central, using two advanced types of control bars, besides the originally loaded ones. The two advanced types, to those that are denominated 1AV and 2AV in this work, are of different design, however both have in some place of the bar, a section with hafnium like neutron absorber material. They thought about three different scenarios, in the first one, used as reference, is simulated the cycle 10 using the original control bars, while in the other two cases the advanced types are used. The values of the reactivity were compared and of some margins to the thermal limits obtained when using the bars of advanced type, with those obtained in the case in that alone they are considered those original bars. It was found that in condition of power both advanced types present bigger absorber power of neutrons that the original bars, being quantified in average this bigger power in 0.22 pcm/notch for the type 1AV and in 0.51 pcm/notch for the type 2AV. The affectation of the margins to the observed thermal limits is minimum. (Author)

  18. Gamma thermometer longevity test: Laguna Verde 2 instruments recent performance

    Energy Technology Data Exchange (ETDEWEB)

    Cuevas V, G. [Global Nuclear Fuel, Americas, 3901 Castle Hayne Road, Wilmington, North Carolina (United States); Avila N, A.; Calleros M, G., E-mail: Gabriel.Cuevas-Vivas@gnf.com [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verda, Carretera Veracruz-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2013-10-15

    This paper is informative of the General Electric Hitachi and Global Nuclear Fuel - Americas are collaboration with Comision Federal de Electricidad in a longevity test of thermocouples as power monitoring devices. The test conclusions will serve for final engineering design in detailing the Automated Fixed In-core Probes for calibration of the Local Power Range Monitors (LPRMs) of the Economic Simplified Boiling Water Reactor. This paper introduces the collaboration description and some recent performance evaluation of the thermocouples that are sensitive to gamma radiation and are known generically as Gamma Thermometers (G T). The G Ts in Laguna Verde 2 are radially located inside six instrumentation tubes in the core and consist of seven thermocouples, four are aligned with the LPRM heights and three are axially located between LPRM heights. The Laguna Verde 2 G T test has become the longest test of thermocouples as power monitoring devices in a BWR industry history and confirms their reliability in terms of time-dependent small noise under steady state reactor conditions and good agreement against Traversing In-core Probes power measurements. (Author)

  19. Dynamic analysis of the condensate and of the feed water in the Laguna Verde nuclear power station; Analisis dinamico del sistema de condensado y agua de alimentacion de la nucleoelectrica de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Macedo Muth, Javier; Sandoval Pena, Ramon [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    This article shows a non-lineal mathematical model for the condensate, and feed water systems and for feed water heater drains at the Laguna Verde Nuclear Power Station for its simulation in real time. The model allows the calculation of flows and pressures in all the piping system and equipment that integrate the systems. It was obtained by using the force unbalance in the fluid concept and is capable of reproducing its dynamic behavior through variations induced by the different operation modes and more common failures. The final model objective is to form part of the Laguna Verde simulator that will be used for operator training of this Nuclear Power Plant. [Espanol] En este articulo se muestra un modelo matematico no lineal de los sistemas de condensado, agua de alimentacion y drenes de calentadores de la central nuclear de Laguna Verde para su simulacion en tiempo real. El modelo permite calcular los flujos y las presiones en toda la red de tuberias y equipos que integran los sistemas. Se obtuvo utilizando el concepto de desbalance de fuerzas en el fluido, y es capaz de reproducir su comportamiento dinamico ante variaciones inducidas por los diversos modos de operacion y fallas mas comunes. El objetivo final del modelo es formar parte del simulador de Laguna Verde que se empleara para el adiestramiento de los operadores de dicha central nuclear.

  20. Validation of a new software version for monitoring of the core of the Unit 2 of the Laguna Verde power plant with ARTS; Validacion de una nueva version del software para monitoreo del nucleo de la Unidad 2 de la Central Laguna Verde con ARTS

    Energy Technology Data Exchange (ETDEWEB)

    Calleros, G.; Riestra, M.; Ibanez, C.; Lopez, X.; Vargas, A.; Mendez, A.; Gomez, R. [CFE, Central Nucleoelectrica de Laguna Verde, Alto Lucero, Veracruz (Mexico)]. e-mail: gcm9acpp@cfe.gob.mx

    2005-07-01

    In this work it is intended a methodology to validate a new version of the software used for monitoring the reactor core, which requires of the evaluation of the thermal limits settled down in the Operation Technical Specifications, for the Unit 2 of Laguna Verde with ARTS (improvements to the APRMs, Rod Block Monitor and Technical specifications). According to the proposed methodology, those are shown differences found in the thermal limits determined with the new versions and previous of the core monitoring software. Author)

  1. Validation of a new version of software for monitoring the core of nuclear power plant of Laguna Verde Unit 2, at the end of Cycle 10; Validacion de una nueva version del software para monitoreo del nucleo de la Central Laguna Verde Unidad 2, al final del Ciclo 10

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, G.; Calleros, G.; Mata, F. [Comision Federal de Electricidad, Central Nucleoelectrica de Laguna Verde, Carretera Cardel-Nautla Km 42.5, Veracruz (Mexico)], e-mail: gabriel.hernandez05@cfe.gob.mx

    2009-10-15

    This work shows the differences observed in thermal limits established in the technical specifications of operation, among the new software, installed at the end of Cycle 10 of Unit 2 of nuclear power plant of Laguna Verde, and the old software that was installed from the beginning of the cycle. The methodology allowed to validate the new software during the coast down stage, before finishing the cycle, for what could be used as tool during the shutdown of Unit 2 at the end of Cycle 10. (Author)

  2. Radiological protection in Laguna Verde, the challenge of being better; Proteccion radiologica en Laguna Verde, el reto de ser mejores

    Energy Technology Data Exchange (ETDEWEB)

    Serrano R, H. [CFE, Central Laguna Verde, Proteccion Radiologica, Km 42.5 Carretera Cardel-Nautla, Veracruz (Mexico)]. e-mail: hsr98581@cfe.gob.mx

    2008-07-01

    The operation of the nuclear power plants in the last decade is based on the application of standard directed towards the excellence. The nuclear power plant of Laguna Verde (CNLV), is not the exception and in the 18 years of commercial operation, the safety culture has matured in the personnel. Standard and political implemented like in the control of dosimeter alarms, equipment condition, meetings pre-work, the practice of protection to the systems and the fuel, as well as the order and the cleaning have distinguished to the CNLV with other power stations. The sense of property of the personnel towards its work is fundamental for the achievement of results. It is reason for the present work to show since it has been gotten to obtain results directed to the excellence in the activities or of normal operation and recharge, where the security is the principle priority. (Author)

  3. Innovation, creative ideas to attend the challenges of the Central Laguna Verde for the period 2011-2015 due to new 100% of power; Innovacion, ideas creativas para atender los retos y desafios del periodo de la Central Laguna Verde en 2011-2015 por el nuevo 100% de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Rivera C, A., E-mail: arr99999@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Veracruz (Mexico)

    2011-11-15

    For the nuclear power plant of Laguna Verde (CLV) is an opportunity to present to the nuclear community in Mexico the improvement areas and challenges for the period 2011-2015, now that has been concluded the phase of starting tests of the CLV modernization, with an increment of power of 20% that represents a new generation of electrical power of 815 M We per hour in the 2 Units, with these new challenges the strategic planning 2011 at 2015 take relevance to give guide to the innovation, with new ideas of improvement to the processes, human resources and leadership, with the purpose of maintaining reliable all the equipment s and process systems by means of the use of strengths, opportunities, vulnerabilities and threats analysis, in order to make strategies that aid to generate competitive advantages for the production of electric power in Mexico, using privileged information that contain the database of the improvement systems, like are the programs of corrective action, of human acting, of external operational experience, of auto-evaluation and of benchmarking that is the referential comparison with other similar power stations. At present, in the general management of operation exist the training by coaching to grow in the formation of the half commands and line supervisors, reinforcing the wanted behaviors, the abilities of the technicians, and the orientation in deficient performances in the search of the operational excellence. (Author)

  4. Study and characterization of noble metal deposits on similar rusty surfaces to those of the reactor U-1 type BWR of nuclear power station of Laguna Verde; Estudio y caracterizacion de depositos de metales nobles sobre superficies oxidadas similares a las del reactor de la Central de Laguna Verde (CNLV) U1 del tipo BWR

    Energy Technology Data Exchange (ETDEWEB)

    Flores S, V. H.

    2011-07-01

    In the present investigation work, were determined the parameters to simulate the conditions of internal oxidation reactor circulation pipes of the nuclear power plant of Laguna Verde in Veracruz. We used 304l stainless steel cylinders with two faces prepared with abrasive paper of No. 600, with the finality to obtain similar surface to the internal circulation piping nuclear reactor. Oxides was formed within an autoclave (Autoclave MEX-02 unit B), which is a device that simulates the working conditions of the nuclear reactor, but without radiation generated by the fission reaction within the reactor. The oxidation conditions were a temperature of 280 C and pressure of 8 MPa, similar conditions to the reactor operating in nuclear power plant of Laguna Verde in Veracruz, Mexico (BWR conditions), with an average conductivity of 4.58 ms / cm and 2352 ppb oxygen to simulate normal water chemistry NWC. Were obtained deposits of noble metal oxides formed on 304l stainless steel samples, in a 250 ml autoclave at a temperature range of 180 to 200 C. The elements that were used to deposit platinum-rhodium (Pt-Rh) with aqueous Na{sub 2}Pt (OH){sub 6} and Na{sub 3}Rh (NO{sub 2}){sub 6}, Silver (Ag) with an aqueous solution of AgNO{sub 3}, zirconium (Zr) with aqueous Zr O (NO{sub 3}) and ZrO{sub 2}, and zinc (Zn) in aqueous solution of Zn (NO{sub 3}){sub 2} under conditions of normal water chemistry. Also there was the oxidation of 304l stainless steel specimens in normal water chemistry with a solution of Zinc (Zn) (NWC + Zn). Oxidation of the specimens in water chemistry with a solution of zinc (Zn + NWC) was prepared in two ways: within the MEX-02 autoclave unit A in a solution of zinc and a flask at constant temperature in zinc solution. The oxides formed and deposits were characterized by scanning electron microscopy, energy dispersive X-ray analysis, elemental field analysis and X-ray diffraction. By other hand was evaluated the electrochemical behavior of the oxides

  5. Revision of documents guide to obtain the renovation of licence of the nuclear power plant of Laguna Verde, Units I and II; Revision de documentos guia para obtener la renovacion de licencia de la Central Nuclear Laguna Verde Unidades 1 and 2

    Energy Technology Data Exchange (ETDEWEB)

    Jarvio C, G. [ININ 52750 La Marquesa, Estado de Mexico (Mexico); Fernandez S, G. [CFE, Gerencia de Centrales Nucleoelectricas, Subgerencia de Ingenieria, Carretera Veracruz-Medellin s/n (Km. 7.5), Dos Bocas, 54270 Veracruz (Mexico)]. e-mail: giarvio@yahoo.com.mx

    2008-07-01

    Unquestionably the renovation of license of the nuclear power plants , it this converting in a promising option to be able to gather in sure, reliable form and economic those requests about future energy in the countries with facilities of this type. This work it analyzes four documents guide and their application for the determination of the renovation of it licenses in nuclear plants that will serve of base for their aplication in the Nuclear Power Plant of Laguna Verde Units I and 2. The four documents in question are: the one Inform Generic of Learned Lessons on the Aging (NUREG - 1801), the Standard Revision Plan for the Renovation of License (NUREG - 1800), the Regulatory Guide for Renovation of License (GR-1.188), and the NEI 95-10, developed by the Institute of Nuclear Energy that is an Industrial Guide to Implement the Requirements of the 1OCFR Part 54-the Rule of Renovation of It licenses. (Author)

  6. Simulation of the steady state of the Laguna Verde Nuclear power station at full power (1931 MWt and 2027 Mwt) with the SCDAPSIM code; Simulacion del estado estacionario de la Central Nucleoelectrica de Laguna Verde a plena potencia (1931 MWt y 2027 MWt) con el codigo SCDAPSIM

    Energy Technology Data Exchange (ETDEWEB)

    Amador G, R.; Nunez C, A.; Mateos, E. del A. [Comision Nacional de Seguridad Nuclear y Salvaguardias, Mexico D.F. (Mexico)

    2001-07-01

    This document describes two models developed for the Laguna Verde Nuclear Power Station (LVNPP) using SCDAPSIM computer code. These models represent the LVNPP in normal operation with a nominal power of 1931 MWt and power uprate conditions of 2027 MWt. The steady states obtained by means of these models comply with the criteria established by the ANSI/ANS-3.5-1985 for nuclear power plant simulators. This criteria has been applied to the models of the LVNPP developed by CNSNS in want of some international accepted criteria for ''Best Estimation'' computer codes. These models will be the bases to carry out studies of validation of the own models as well as the analysis of diverse scenarios that evolve to a severe accident. (Author)

  7. Analysis of the micro-structural damages by neutronic irradiation of the steel of reactor vessels of the nuclear power plant of Laguna Verde. Characterization of the design steel; Analisis de los danos micro-estructurales por irradiacion neutronica del acero de la vasija de los reactores de la Central Nuclear de Laguna Verde. Caracterizacion del acero de diseno

    Energy Technology Data Exchange (ETDEWEB)

    Moranchel y Rodriguez, M.; Garcia B, A. [IPN, Escuela Superior de Fisica y Matematicas, Departamento de Fisica, Av. Luis Enrique Erro s/n, Unidad Profesional Adolfo Lopez Mateos, Col. Lindavista, 07738 Mexico D. F. (Mexico); Longoria G, L. C., E-mail: mmoranchel@ipn.m [ININ, Direccion de Investigacion Cientifica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2010-09-15

    The vessel of a nuclear reactor is one of the safety barriers more important in the design, construction and operation of the reactor. If the vessel results affected to the grade of to have fracture and/or cracks it is very probable the conclusion of their useful life in order to guarantee the nuclear safety and the radiological protection of the exposure occupational personnel, of the public and the environment avoiding the exposition to radioactive sources. The materials of the vessel of a nuclear reactor are exposed continually to the neutronic irradiation that generates the same nuclear reactor. The neutrons that impact to the vessel have the sufficient energy to penetrate certain depth in function of the energy of the incident neutron until reaching the repose or to be absorbed by some nucleus. In the course of their penetration, the neutrons interact with the nuclei, atoms, molecules and with the same crystalline nets of the vessel material producing vacuums, interstitial, precipitate and segregations among other defects that can modify the mechanical properties of the steel. The steel A533-B is the material with which is manufactured the vessel of the nuclear reactors of nuclear power plant of Laguna Verde, is an alloy that, among other components, it contains atoms of Ni that if they are segregated by the neutrons impact this would favor to the cracking of the same vessel. This work is part of an investigation to analyze the micro-structural damages of the reactor vessels of the nuclear power plant of Laguna Verde due to the neutronic irradiation which is exposed in a continuous way. We will show the characterization of the design steel of the vessel, what offers a comprehension about their chemical composition, the superficial topography and the crystalline nets of the steel A533-B. It will also allow analyze the existence of precipitates, segregates, the type of crystalline net and the distances inter-plains of the design steel of the vessel. (Author)

  8. Severe Accident Simulation of the Laguna Verde Nuclear Power Plant

    Directory of Open Access Journals (Sweden)

    Gilberto Espinosa-Paredes

    2012-01-01

    Full Text Available The loss-of-coolant accident (LOCA simulation in the boiling water reactor (BWR of Laguna Verde Nuclear Power Plant (LVNPP at 105% of rated power is analyzed in this work. The LVNPP model was developed using RELAP/SCDAPSIM code. The lack of cooling water after the LOCA gets to the LVNPP to melting of the core that exceeds the design basis of the nuclear power plant (NPP sufficiently to cause failure of structures, materials, and systems that are needed to ensure proper cooling of the reactor core by normal means. Faced with a severe accident, the first response is to maintain the reactor core cooling by any means available, but in order to carry out such an attempt is necessary to understand fully the progression of core damage, since such action has effects that may be decisive in accident progression. The simulation considers a LOCA in the recirculation loop of the reactor with and without cooling water injection. During the progression of core damage, we analyze the cooling water injection at different times and the results show that there are significant differences in the level of core damage and hydrogen production, among other variables analyzed such as maximum surface temperature, fission products released, and debris bed height.

  9. Analysis of the stability of events occurred in Laguna Verde; Analisis de estabilidad de eventos ocurridos en Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Castillo D, R.; Ortiz V, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Calleros M, G. [CFE, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km. 42.5, Alto Lucero, Veracruz (Mexico)

    2005-07-01

    The new fuel designs for operation cycles more long have regions of uncertainty bigger that those of the old fuels, and therefore, they can have oscillations of power when an event is presented that causes that the reactor operates to high power and low flow of coolant. During the start up of the reactor there are continued procedures that avoid that oscillations are presented with that which makes sure the stable behavior of the reactor. However, when the reactor is operating to nominal conditions and they are shot or they are transferred to low speed the recirculation pumps, it cannot make sure that the reactor doesn't present oscillations of power when entering to the restricted operation regions. The methods of stability analysis commonly use signs of neutronic noise that require to be stationary, but after a transitory one where they commonly get lost the recirculation pumps the signs they don't have the required characteristics, for what they are used with certain level of uncertainty by the limited validity of the models. In this work the Prony method is used to determine the reactor stability, starting from signs of transitory and it is compared with autoregressive models. Four events are analyzed happened in the Laguna Verde power plant where the reactor was in the area of high power and low flow of coolant, giving satisfactory results. (Author)

  10. Scenarios simulation of severe accident type small loss of coolant (Loca), with the code MELCOR version 2.1 for the nuclear power plant of Laguna Verde; Simulacion de escenarios de accidente severo tipo perdida de refrigerante (Loca) pequeno, con el codigo MELCOR version 2.1 para la central nucleo-electrica de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Cardenas V, J.; Mugica R, C. A.; Godinez S, V., E-mail: Jaime.cardenas@cnsns.gob.mx [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Jose Ma. Barragan No. 779, Col. Narvarte, 03020 Mexico D. F. (Mexico)

    2013-10-15

    In this work was carried out the analysis of two scenarios of the accident type with loss of coolant in a recirculation loop for a break with smaller ares to 0.1 ft{sup 2} (4.6 cm{sup 2}), which is classified according to their size like small Loca. The first simulated scenario was a small Loca without action of the emergency coolant injection systems, and the second was a small Loca with only the available system LPCS. This design base accident was taken into account for its relevance with regard to the damage to the core and the hydrogen generation. Was also observed and analyzed the response of the action of the ECCS that depend of the loss of coolant reason and this in turn depends of the size and type of the pipe break. The specified scenarios were simulated by means of the use of MELCOR model for the nuclear power plant of Laguna Verde that has the Comision Nacional de Seguridad Nuclear y Salvaguardias. (Author)

  11. Simulations of the design basis accident at conditions of power increase and the o transient of MSIV at overpressure conditions of the Laguna Verde Power Station; Simulaciones del accidente base de diseno a condiciones de aumento de potencia y del transitorio de cierre de MSIV a condiciones de sobrepresion de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Araiza M, E.; Nunez C, A. [Comision Nacional de Seguridad Nuclear y Salvaguardias, 03000 Mexico D.F. (Mexico)

    2001-07-01

    This document presents the analysis of the simulation of the loss of coolant accident at uprate power conditions, that is 2027 MWt (105% of the current rated power of 1931MWt). This power was reached allowing an increase in the turbine steam flow rate without changing the steam dome pressure value at its rated conditions (1020 psiaJ. There are also presented the results of the simulation of the main steam isolation va/ve transient at overpressure conditions 1065 psia and 1067 MWt), for Laguna Verde Nuclear Power Station. Both simulations were performed with the best estimate computer code TRA C BF1. The results obtained in the loss of coolant accident show that the emergency core coolant systems can recover the water level in the core before fuel temperature increases excessively, and that the peak pressure reached in the drywell is always below its design pressure. Therefore it is concluded that the integrity of the containment is not challenged during a loss of coolant accident at uprate power conditions.The analysis of the main steam isolation valve transients at overpressure conditions, and the analysis of the particular cases of the failure of one to six safety relief valves to open, show that the vessel peak pressures are below the design pressure and have no significant effect on vessel integrity. (Author)

  12. Quality studies of the energy in the electric net of the gathering warehouse of reusable parts and contaminate oils of the nuclear power plant Laguna Verde; Estudios de calidad de la energia en la red electrica del almacen de acopio de partes reusables y aceites contaminados (CCAC) de la Central Nuclear Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Tijerina S, F.; Vargas A, A.; Cardenas J, J., E-mail: francisco.tijerina@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Carretera Cardel-Nautla Km 42.5, Veracruz (Mexico)

    2012-10-15

    In the industry exist the high costs by faults of electronic and electric equipment s, due to during the design process, installation, tests and operation of these equipment s, is not had appropriate detection equipment to carry out quality studies of the energy. These studies give an important support to know that occurs in an electric net, the cause of the anomalous behavior of the equipment s and this way to avoid the expensive faults carrying out necessary engineering adaptations in an electric net. The elements of the electricity that are determined are the tension, current and frequency that are inside acceptable operational parameters that facilitate the operation and constant operation of the equipment s, free of interruptions and failures. The application of the quality studies of the energy is growing little by little in Mexico for the problems solution in the equipment s. This field is also developing new techniques and technologies integrated in the equipment s for its monitoring detection and protection. The present work offers the results of the first Quality Study of the Energy in the nuclear power plant of Laguna Verde to solve the problem in the gathering warehouse of reusable parts and contaminate oils, in which the failure of the two radiation monitors of the gassy effluent of ventilation HVAC of the warehouse took place. (Author)

  13. Closure simulation of the MSIV of Unit 1 of the Laguna Verde nuclear power plant using the Simulate 3K code; Simulacion del cierre de las MSIV de la Unidad 1 de la central nuclear Laguna Verde empleando el codigo Simulate-3K

    Energy Technology Data Exchange (ETDEWEB)

    Alegria A, A., E-mail: aalegria@cnsns.gob.mx [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan 779, Col. Narvarte, 03020 Ciudad de Mexico (Mexico)

    2015-09-15

    In this paper the simulation of closure transient of all main steam isolation valves (MSIV) was performed with the Simulate-3K (S-3K) code for the Unit 1 of the Laguna Verde nuclear power plant (NPP-LV), which operates to thermal power of 2317 MWt, corresponding to the cycle 15 of operation. The set points for the performance of systems correspond to those set out in transient analysis: 3 seconds for the closure of all MSIV; the start of Scram when 121% of the neutron flux is reached, respect from baseline before the transient; the opening by peer of safety relief valves (SRV) in relief mode when the set point of the pressure is reached, the shoot of the feedwater flow seconds after the start of closing of the MSIV and the shoot of the recirculation water pumps when the pressure is reached in the dome of 1048 psig. The simulation time was of 57 seconds, with the top 50 to reach the steady state, from which the closure of all MSIV starts. In this paper the behavior of the pressure in the dome are analyzed, thermal power, neutron flux, the collapsed water level, the flow at the entrance of core, the steam flow coming out of vessel and the flow through of the SRV; the fuel temperature, the minimal critical power ratio, the readings in the instrumentation systems and reactivities. Instrumentation systems were implemented to analyze the neutron flux, these consist of 96 local power range monitors (LPRM) located in different radial and axial positions of the core and 4 channels of average power range monitors, which grouped at 24 LPRM each one. LPRM response to the change of neutron flux in the center of the core, at different axial positions is also shown. Finally, the results show that the safety limit MCPR is not exceeded. (Author)

  14. Proposal of the visual inspection of the integrity of the storage cells of spent fuel from the nuclear power plant of Laguna Verde; Propuesta para la inspeccion visual de la integridad de las celdas de almacenamiento de combustible gastado de la Central Laguna Verde (CLV)

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, J. L.; Rivero G, T.; Merino C, F. J. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Santander C, L. E., E-mail: francisco.merino@inin.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Veracruz-Medellin Km 7.5, Col. Dos Bocas, 94271 Medellin, Veracruz (Mexico)

    2015-09-15

    As part of the evaluation of the structural integrity of the components of nuclear plants, particularly those applying for life extension is necessary to carry out inspections and nondestructive testing to determine the state meet. In many cases these activities are carried out in areas with high levels of radiation and contamination difficult to access, so that are required to use equipment or robotic systems operated remotely. Among others, the frames and cells of the storage pools for spent fuel are structures subject to a program of tests and inspections, and become relevant because the nuclear power plant of Laguna Verde (NPP-LV) is processing the license to extend the operational life of its reactors. Of non-destructive testing can be used to verify the physical condition of the frames and storage cells, is the remote visual inspection which is a test that allows determine the physical integrity of the components by one or more video cameras designed to applications in underwater environments with radiation, and are used to identify and locate adverse conditions such as ampoules, protuberances, pitting, cracks, stains or buckling, which could affect the three main functions for which the store components are designed: to maintain the physical integrity of spent fuels, store them properly guaranteeing their free insertion and removal, and ensure that the store as a whole meets the criticality criteria that k{sub eff} is less than 0.95 throughout the life of the plant. This paper describes a proposal to carry out the visual inspection of the storage cells of spent fuel from the NPP-LV using a probe including one or more video cameras along with your recorder, and its corresponding control program. It is noted that due to the obtained results, the nuclear power plant personnel can make decisions regarding remedial actions or applying complementary methods to verify that the cells and frames have not lost their physical integrity, or in particular that the cover

  15. Ultrasonic meters in the feedwater flow to recover thermal power in the reactor of nuclear power plant of Laguna Verde U1 and U2; Medidores ultrasonicos en el flujo de agua de alimentacion para recuperar potencia termica en el reactor de la Central Nuclear Laguna Verde U1 and U2

    Energy Technology Data Exchange (ETDEWEB)

    Tijerina S, F. [CFE, Central Laguna Verde, Km. 42.5 Carretera Cardel-Nautla, Veracruz (Mexico)]. e-mail: francisco.tijerina@cfe.gob.mx

    2008-07-01

    The engineers in nuclear power plants BWRs and PWRs based on the development of the ultrasonic technology for the measurement of the mass, volumetric flow, density and temperature in fluids, have applied this technology in two primary targets approved by the NRC: the use for the recovery of thermal power in the reactor and/or to be able to realize an increase of thermal power licensed in a 2% (MUR) by 1OCFR50 Appendix K. The present article mentions the current problem in the measurement of the feedwater flow with Venturi meters, which affects that the thermal balance of reactor BWRs or PWRs this underestimated. One in broad strokes describes the application of the ultrasonic technology for the ultrasonic measurement in the flow of the feedwater system of the reactor and power to recover thermal power of the reactor. One is to the methodology developed in CFE for a calibration of the temperature transmitters of RTD's and the methodology for a calibration of the venturi flow transmitters using ultrasonic measurement. Are show the measurements in the feedwater of reactor of the temperature with RTD's and ultrasonic measurement, as well as the flow with the venturi and the ultrasonic measurement operating the reactor to the 100% of nominal thermal power, before and after the calibration of the temperature transmitters and flow. Finally, is a plan to be able to realize a recovery of thermal power of the reactor, showing as carrying out their estimations. As a result of the application of ultrasonic technology in the feedwater of reactor BWR-5 in Laguna Verde, in the Unit 1 cycle 13 it was recover an equivalent energy to a thermal power of 25 MWt in the reactor and an exit electrical power of 6 M We in the turbogenerator. Also in the Unit 2 cycle 10 it was recover an equivalent energy to a thermal power of 40 MWt in the reactor and an exit electrical power of 16 M We in the turbogenerator. (Author)

  16. Genetic structure of populations of Drosophila melanogaster natives from Laguna Verde, Veracruz; Estructura genetica de poblaciones de Drosophila melanogaster originarias de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Salceda, V.M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: vmss@nuclear.inin.mx

    2005-07-01

    The genetic variability hidden present in natural populations of Drosophila melanogaster, it has been broadly analyzed, and it is a tool that allows to detect differences among the different populations of this species, so much of natural nature as experimental. In this occasion we use it to see if differences exist in two neighboring populations inside the Laguna Verde nuclear power plant, Veracruz, and this way to suggest, of having differences in the mount of the relative frequencies of lethal genes, semi lethals and normal, be due to the radioactive emanations product of the reactors operation of the plant. Its were took samples of flies in both towns during three successive seasons and they were transported to the laboratory of the ININ where they were carried out the tests to determine the frequency of the different types of genes. This was made by means of the denominated technique C y L / Pm that allows by means of a cross series with a stump marker to obtain, in the third generation, in isolated form the different types of genes and this way to calculate their relative frequencies. The study understands the analysis of 299 chromosomes extracted from the populations, of those that 95 correspond at the control population and 204 to the experimental one. As a result of the analysis we find that 30.52 percent of the genes of the population witness contains detrimental genes (sum of the lethal plus the semi lethal genes) as long as in the experimental population this value corresponds to 23.03 percent. In accordance with this information was not significant difference among the studied populations. A similar analysis, but now comparing the seasons, (summer against winter), it showed significant difference to 5% with regard to the lethal genes frequency only in the population witness. These results indicate the absence of damage, however it is necessary to consider that this can be due to that indeed there is not him or that the investigation protocol is not

  17. Generation of the ECP database (ECP02.DAT) at the beginning of the cycle 1 of the Unit 1 of Laguna Verde; Generacion de la base ECP (ECP02.DAT) al inicio del ciclo 1 de la Unidad 1 de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Perusquia C, R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1992-10-15

    In order to carrying out a comparison among the results provided for the Program of Estimate of the ECP Critical Position and the Shutdown/Startup produced in the Cycle 1 of the Unit 1 of Laguna Verde, it was generated the base of the ECP program, following the outlines settled down in the Procedure 'Generation of ECP Database for Laguna Verde' (IT.SN/DFR 074). Next the data sheets filled when being generated the ECP02.DAT database at the beginning of the cycle are provided. In the IT.SN/DFR 079 report 'Adjustment and Preliminary Evaluation of the Predictions of Criticity of the ECP Program with Reported Data of Cycle 1 of the Unit 1 of Laguna Verde, the results of the comparison among the estimates of the ECP program using the ECP02.DAT with the real data of the Cycle 1 of the Unit 1 of Laguna Verde are presented. (Author)

  18. Preliminary evaluation of the profitability indexes of the Laguna Verde nuclear power plant

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-10-15

    The Laguna Verde nuclear power plant of the Federal Commission of Electricity has an installed capacity of 1,350 MW and unit 1 started commercial operation in 1990 and unit 2 in 1995. This paper is a synthesis of the results of a preliminary evaluation of the expected profitability indexes of the power plant during an economic lifetime of 40 years. The following data was used as input to the evaluation model prescribed by the Finance and Public Credit Secretary for public investment projects. Unit investment cost: 3,500 US D/k W; Fixed operation and maintenance cost: 54.{sup 45} US D/year-k W; Variable operation and maintenance cost: 0.{sup 38} US D/M Wh; Nuclear fuel cycle cost: 10.{sup 28} US D/M Wh; Lifetime capacity factor: 85%; Discount rate: 12.0% per year; Sale price of electricity to the interconnected electric system: 80.{sup 75} US D/M Wh. The output of the evaluation model is the following: Cost of electricity generated: 60.{sup 2}1 US D/M Wh; fixed cost 49.{sup 55} US D/M Wh; variable cost 10.{sup 66} US D/M Wh; Internal rate of return (Irr): 18.0%; Benefit to cost quotient (B/C): 1.341. A very systematic sensitivity analysis was done, that shows that the cost is very sensitive to the capacity factor and to the investment cost, but is very insensitive to the fixed operation and maintenance cost and to the nuclear fuel cost. Finally, a comparison was made to the evaluation of the profitability indexes of a natural gas fired combined cycle power plant. (Author)

  19. Estimation of fast neutron fluence in steel specimens type Laguna Verde in TRIGA Mark III reactor; Estimacion de la fluencia de neutrones rapidos en probetas de acero tipo Laguna Verde en el reactor Triga Mark III

    Energy Technology Data Exchange (ETDEWEB)

    Galicia A, J.; Francois L, J. L. [UNAM, Facultad de Ingenieria, Departamento de Sistemas Energeticos, Ciudad Universitaria, 04510 Ciudad de Mexico (Mexico); Aguilar H, F., E-mail: blink19871@hotmail.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2015-09-15

    The main purpose of this work is to obtain the fluence of fast neutrons recorded within four specimens of carbon steel, similar to the material having the vessels of the BWR reactors of the nuclear power plant of Laguna Verde when subjected to neutron flux in a experimental facility of the TRIGA Mark III reactor, calculating an irradiation time to age the material so accelerated. For the calculation of the neutron flux in the specimens was used the Monte Carlo code MCNP5. In an initial stage, three sheets of natural molybdenum and molybdenum trioxide (MoO{sub 3}) were incorporated into a model developed of the TRIGA reactor operating at 1 M Wth, to calculate the resulting activity by setting a certain time of irradiation. The results obtained were compared with experimentally measured activities in these same materials to validate the calculated neutron flux in the model used. Subsequently, the fast neutron flux received by the steel specimens to incorporate them in the experimental facility E-16 of the reactor core model operating at nominal maximum power in steady-state was calculated, already from these calculations the irradiation time required was obtained for values of the neutron flux in the range of 10{sup 18} n/cm{sup 2}, which is estimated for the case of Laguna Verde after 32 years of effective operation at maximum power. (Author)

  20. Validation of the thermal balance of Laguna Verde turbine under conditions of extended power increase; Validacion del balance termico de turbina de Laguna Verde en condiciones de aumento de potencia extendido

    Energy Technology Data Exchange (ETDEWEB)

    Castaneda G, M. A.; Cruz B, H. J.; Mercado V, J. J.; Cardenas J, J. B.; Garcia de la C, F. M., E-mail: miguel.castaneda01@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2012-10-15

    The present work is a continuation of the task: Modeling of the vapor cycle of Laguna Verde with the PEPSE code to conditions of thermal power licensed at present (2027 MWt) in which the modeling of the vapor cycle of the nuclear power plant of Laguna Verde was realized with PEPSE code (Performance Evaluation of Power System Efficiencies). Once reached the conditions of nominal operation of extended power increase, operating both units to 2371 MWt; after the tests phase of starting-up and operation is necessary to carry out a verification of the proposed design of the vapor cycle for the new operation conditions. All this, having in consideration that the vapor cycle designer only knows the detail of the prospective performance of the main turbine, for all the other components (for example pumps, heat inter changers, valves, reactor, humidity separators and re-heaters, condensers, etc.) makes generic suppositions based on engineering judgment. This way carries out the calculations of thermal balance to determine the guaranteed gross power. The purpose of the present work is to comment the detail of the validation carried out of the specific thermal balance (thermal kit) of the nuclear power plant, making use of the design characteristics of the different components that conform the vapor cycle. (Author)

  1. Asociación a sustratos de los erizos regulares (Echinodermata: Echinoidea) en la laguna arrecifal de Isla Verde, Veracruz, México

    OpenAIRE

    E.V. Celaya-Hernández; F.A. Solís-Marín; A. Laguarda-Figueras; A. de la L. Durán-González; T. Ruiz Rodríguez

    2008-01-01

    Se presenta el estudio de la diversidad, abundancia, distribución y asociación de sustrato de las especies de erizos regulares presentes en la parte Sur de la laguna arrecifal de Isla Verde, Veracruz, México. Se realizaron cuatro recolectas entre octubre del 2000 a octubre del 2002. Se seleccionó un cuadrante de muestreo, el más representativo, en la zona suroeste de la laguna arrecifal, con un área de 23 716 m2, asi mismo se muestreó en toda la parte sur de la laguna arrecifal. Las especies ...

  2. Evaluation of the integrity and duration of the Laguna Verde nuclear power plant life- Plant Life Management program (PLIM). TC MEX 04/53 Technical Cooperation Project; Evaluacion de la integridad y extension de vida de la planta de potencia nuclear Laguna Verde- Programa de manejo de vida de planta (PLIM). Proyecto de cooperacion tecnica TC MEX 04/53

    Energy Technology Data Exchange (ETDEWEB)

    Arganis J, C.R.; Diaz S, A.; Aguilar T, J.A. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2006-07-01

    As part of the IAEA TC MEX 04/53 Project 'Evaluation of the integrity and extension of life of the Laguna Verde nuclear power plant Handling Program of plant' whose objective is the one of beginning the actions to apply the methodology of Handling of plant life in the Unit 1 of the Laguna Verde Nucleo electric Central for to obtain the Renovation of License in 2020 the ININ, through the Department of Synthesis and Characterization of materials has carried out more of 20 analysis of susceptibility to the intergranular cracking for corrosion under effort in interns so much of the reactor of the unit 1 like of the unit 2 documenting the current state of components based on the type or types of materials that conform them, to it thermomechanical history, operational and of production, as well as of the particularities associated to its use and operation. For the application of the methodology of life handling of plant 5 structure systems or pilot components were selected, to carry out the programs of handling of the aging and handling of plant life: The encircling of the reactor core (Core Shroud), the reactor pressure vessel (Reactor Pressure Vessel), the primary container (Primary Containment), the recirculation system of feeding water (Reactor Feed Water) and cables. (Author)

  3. Modeling of the vapor cycle of Laguna Verde with the PEPSE code to conditions of thermal power licensed at present (2027 MWt); Modelado del ciclo de vapor de Laguna Verde con el codigo PEPSE a condiciones de potencia termica actualmente licenciada (2027 MWt)

    Energy Technology Data Exchange (ETDEWEB)

    Castaneda G, M. A.; Maya G, F.; Medel C, J. E.; Cardenas J, J. B.; Cruz B, H. J.; Mercado V, J. J., E-mail: miguel.castaneda01@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Veracruz (Mexico)

    2011-11-15

    By means of the use of the performance evaluation of power system efficiencies (PEPSE) code was modeled the vapor cycle of the nuclear power station of Laguna Verde to reproduce the nuclear plant behavior to conditions of thermal power, licensed at present (2027 MWt); with the purpose of having a base line before the implementation of the project of extended power increase. The model of the gauged vapor cycle to reproduce the nuclear plant conditions makes use of the PEPSE model, design case of the vapor cycle of nuclear power station of Laguna Verde, which has as main components of the model the great equipment of the vapor cycle of Laguna Verde. The design case model makes use of information about the design requirements of each equipment for theoretically calculating the electric power of exit, besides thermodynamic conditions of the vapor cycle in different points. Starting from the design model and making use of data of the vapor cycle measured in the nuclear plant; the adjustment factors were calculated for the different equipment s of the vapor cycle, to reproduce with the PEPSE model the real vapor cycle of Laguna Verde. Once characterized the model of the vapor cycle of Laguna Verde, we can realize different sensibility studies to determine the effects macros to the vapor cycle by the variation of certain key parameters. (Author)

  4. Laguna Verde: a 120% extended power up-rate project developed by Iberdrola

    Energy Technology Data Exchange (ETDEWEB)

    Merino Teillet, A.; Garcia-Serrano Tapia, J. L.; Ruiz Gutierrez, L. [Iberdrola Ingenieria y Construccion S.A Sociedad Unipersonal (Spain)

    2010-07-01

    The experience which this document wants to present, describes the work being developed by IBERDROLA Ingenieria y Construccion, for the Laguna Verde plant in Mexico, owned by the Federal Electricity Commission (CFE). This generation plant consists of two light boiling water type units (BWR) design by General Electric in the 80's. The objective of this project is to perform the modifications on the thermal cycle of the plant required by an Extended Power Up-rate, to achieve a safe and reliable operation of the plant at 120% of its original thermal power, whilst upgrading and renovating plant equipment and installations to achieve a license renewal from 40 to 60 years of operation The consortium formed in 97% by IBERDROLA Ingenieria y Construccion SAU and in 3% by ALSTOM Mexicana, S.A. de CV, was awarded the contract in an international bid, competing against General Electric and Siemens. The project began in March 2007 and is scheduled to finalize in December 2010. At this point the work carried out include modifications of the main condenser replacement, moisture separator reheaters (MSR's) and feedwater heaters no. 5 and 6 in the two units, therefore having executed two out of four scheduled outages. The scope, development and organization of this project, whose basic elements include the design, engineering, training, supply of equipment, dismantling, installation, testing, commissioning, treatment and delivery of radioactive waste generated during the project implementation to CFE, is aimed to ensure a safe and reliable operation of the plant under the new conditions of increased thermal power of the reactor, with a thermal cycle optimized so that the gross power of the generator increase from the current 686.7 MWe to a value of 817.1 MWe in both units. An Extended Power Up-rate means an opportunity to modernize equipments, to improve maintenance, to get a better plant knowledge and to motivate the employees facing a challenging project. This project

  5. To report the obtained results in the simulation with the FCS-11 and Presto codes of the two first operation cycles of the Laguna Verde Unit 1 reactor; Reportar los resultados obtenidos en la simulacion con los codigos FCS-11 y PRESTO de los dos primeros ciclos de operacion del reactor Laguna Verde Unidad 1

    Energy Technology Data Exchange (ETDEWEB)

    Montes T, J.L.; Moran L, J.M.; Cortes C, C.C

    1990-08-15

    The objective of this work is to establish a preliminary methodology to carry out analysis of recharges for the reactor of the Laguna Verde U-1, by means of the evaluation of the state of the reactor core in its first two operation cycles using the FCS2 and Presto-B codes. (Author)

  6. Generation of the ECP database (ECP01.DAT) of the cycle 1 of the Unit 1 of Laguna Verde with burnt of 1377 MWD/MT; Generacion de la base ECP (ECP01.DAT) del ciclo 1 de la Unidad 1 de Laguna Verde con quemado de 1377 MWD/MT

    Energy Technology Data Exchange (ETDEWEB)

    Perusquia C, R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1992-10-15

    In order to carrying out a comparison among the results provided by the Program of Estimate of the ECP Critical Position and the Shutdown/Startup produced in the Cycle 1 of the Unit 1 of Laguna Verde, it was generated the base of the ECP program, following the outlines settled down in the Procedure 'Generation of ECP Database for Laguna Verde' (IT.SN/DFR-074). Next the data sheets filled when being generated the ECP01.DAT database with a burnt of 1377 MWD/MT are provided. In the report IT.SN/DFR-079 'Adjustment and Preliminary Evaluation of the Predictions of Criticity of the ECP Program with Reported Data of the Cycle 1 of the Unit 1 of Laguna Verde', the results of the comparison among those estimates of the ECP program using the ECP01.DAT database with the real data of the Cycle 1 of the Unit 1 of Laguna Verde are presented. (Author)

  7. SIMPRO, a practical tool for training the staff of Laguna Verde nuclear power plant; El SIMPRO, una herramienta practica para la capacitacion y entrenamiento del personal de la CNLV

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Valdez, Guillermo Omar; Gomez Camargo, Octavio; Castelo Cuevas, Luis; Vazquez Bustos, Jesus [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2012-06-22

    Laguna Verde Nuclear Power Plant (LVNPP) has implemented a real physical model, which represents several parts of a simplified version of its process. This development has proved to be very useful to improve the compliance with training programs and staff training maintenance in the different disciplines of engineering. Such programs are required by regulations and standards applicable for Nuclear Power Plants (NPP), so that the personnel working in these facilities can be able to respond on time to any contingency that might arise. This paper outlines the creation of the real physical model, how it is integrated and some of the practices that can be performed on this model. [Spanish] La Central Nucleoelectrica de Laguna Verde ha implementado un modelo fisico real que representa varias partes de una version simplificada de su proceso. Este desarrollo ha demostrado ser muy util para mejorar el cumplimiento de programas de adiestramiento, incluidos los del personal de mantenimiento, en diferentes disciplinas de ingenieria. Dichos programas son requeridos por las regulaciones y normas aplicables a las centrales nucleoelectricas, de manera que el personal que trabaja en estas instalaciones pueda ser capaz de responder oportunamente a cualquier contingencia que pudiera surgir. Este articulo describe la creacion del modelo fisico real, como se integra y algunas de las practicas que pueden llevarse a cabo con el.

  8. Analysis of the three dimensional core kinetics NESTLE code coupling with the advanced thermo-hydraulic code systems, RELAP5/SCDAPSIM and its application to the Laguna Verde Central reactor; Analisis para el acoplamiento del codigo NESTLE para la cinetica tridimensional del nucleo al codigo avanzado de sistemas termo-hidraulicos, RELAP5/SCDAPSIM y su aplicacion al reactor de la CNLV

    Energy Technology Data Exchange (ETDEWEB)

    Salazar C, J.H.; Nunez C, A. [CNSNS, Dr. Jose Ma. Barragan No. 779, Col. Narvarte, 03020 Mexico D.F. (Mexico); Chavez M, C. [UNAM, Facultad de Ingenieria, DEPFI Campus Morelos (Mexico)]. E-mail: hsalazar22@prodigy.net.mx

    2004-07-01

    The objective of the written present is to propose a methodology for the joining of the codes RELAP5/SCDAPSIM and NESTLE. The development of this joining will be carried out inside a doctoral program of Engineering in Energy with nuclear profile of the Ability of Engineering of the UNAM together with the National Commission of Nuclear Security and Safeguards (CNSNS). The general purpose of this type of developments, is to have tools that are implemented by multiple programs or codes such a that systems or models of the three-dimensional kinetics of the core can be simulated and those of the dynamics of the reactor (water heater-hydraulics). In the past, by limitations for the calculation of the complete answer of both systems, the developed models they were carried out for separate, putting a lot of emphasis in one but neglecting the other one. These methodologies, calls of better estimate, will be good to the nuclear industry to evaluate, with more high grades of detail, the designs of the nuclear power plant (for modifications to those already existent or for new concepts in the designs of advanced reactors), besides analysing events (transitory and have an accident), among other applications. The coupled system was applied to design studies and investigation of the Laguna Verde Nuclear power plant (CNLV). (Author)

  9. Impact of flow induced vibration acoustic loads on the design of the Laguna Verde Unit 2 steam dryer

    Energy Technology Data Exchange (ETDEWEB)

    Forsyth, D. R.; Wellstein, L. F.; Theuret, R. C.; Han, Y.; Rajakumar, C. [Westinghouse Electric Company LLC, Cranberry Township, PA 16066 (United States); Amador C, C.; Sosa F, W., E-mail: forsytdr@westinghouse.com [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Km 42.5 Carretera Cardel-Nautla, 91680 Alto Lucero, Veracruz (Mexico)

    2015-09-15

    Industry experience with Boiling Water Reactors (BWRs) has shown that increasing the steam flow through the main steam lines (MSLs) to implement an extended power up rate (EPU) may lead to amplified acoustic loads on the steam dryer, which may negatively affect the structural integrity of the component. The source of these acoustic loads has been found to be acoustic resonance of the side branches on the MSLs, specifically, coupling of the vortex shedding frequency and natural acoustic frequency of safety relief valves (SRVs). The resonance that results from this coupling can contribute significant acoustic energy into the MSL system, which may propagate upstream into the reactor pressure vessel steam dome and drive structural vibration of steam dryer components. This can lead to high-cycle fatigue issues. Lock-in between the vortex shedding frequency and SRV natural frequency, as well as the ability for acoustic energy to propagate into the MSL system, are a function of many things, including the plant operating conditions, geometry of the MSL/SRV junction, and placement of SRVs with respect to each other on the MSLs. Comision Federal de Electricidad and Westinghouse designed, fabricated, and installed acoustic side branches (ASBs) on the MSLs which effectively act in the system as an energy absorber, where the acoustic standing wave generated in the side-branch is absorbed and dissipated inside the ASB. These ASBs have been very successful in reducing the amount of acoustic energy which propagates into the steam dome. In addition, modifications to the Laguna Verde Nuclear Power Plant Unit 2 steam dryer have been completed to reduce the stress levels in critical locations in the dryer. The objective of this paper is to describe the acoustic side branch concept and the design iterative processes that were undertaken at Laguna Verde Unit 2 to achieve a steam dryer design that meets the guidelines of the American Society of Mechanical Engineers, Boiler and Pressure

  10. Relative frequencies of deletereo genes in populations of droshopila Melanogaster from Laguna Verde, Veracruz; Frecuencias relativas de genes deletereos en poblaciones de Drosophila melanogaster originarias de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Salceda, V. M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: vmss@nuclear.inin.mx

    2008-07-01

    In order to obtain data about the possible changes and/or damages that could cause the operation of the reactors of the nuclear power plant of Laguna Verde to the populations of drosophila Melanogaster that lives in the zone, one carried out one series of biannual collections (summer and winter) during the years 1991-1992 and 1996-1998 to obtain individuals of this species and to subject them to a battery of tests. The flies of this species that it was possible to capture were transported to the Biology Laboratory of the National Institute of Nuclear Research, where they were put under in individual form a series of you cross they allowed that us in the third generation to detect the presence of deletereo genes that following their viability were catalogued like normal, lethal or less lethal according to the methodology of Wallace. This way a total of 933 second chromosomes was analyzed to leave of them the relative frequencies were calculated of each one of the categories, for each sample station. The result of the applied statistical test indicates us that not significant difference exists among the populations and that the differences of having them must only to the environment changes something that usually happen in all the population. For what we can point out that the presence of the reactors does not seem to influence negatively in the behavior of the population that lives in the zone. (Author)

  11. Estimation of seismic return periods in the Laguna Verde nuclear plant; Estimacion de periodos de retorno sismico en la PNLV

    Energy Technology Data Exchange (ETDEWEB)

    Flores R, J.H

    1992-01-15

    The study of seismic risk in the area of the Laguna Verde Nucleo electric plant (PNLV) and its surroundings, one carries out estimating the different return periods and the occurrence probability in different intervals of time (5, 75, 100, 125, 150 years starting from the distribution of first type of Gumbel (G1) of extreme values (Burton, 1986), the value that was used to evaluate the useful life of the PNLV was of 50 years, the other periods will be occupy to evaluate 'temporal' nuclear cemeteries, that is to say for diminish the radioactive activity of the fuel assemblies already burned in the reactor pool or in a near place to the place. The seismic data that were used for the analysis were of the seismic catalog that it was elaborated from (1920-1982), around the place whose seismic half magnitude was of 5 grades Richter and a depth 65 km, these earthquakes are classified as shallow earthquakes, which are located in the continental plaque of North-America, these they are induced by the efforts of push of the plaque of Cocos, existing 36% of intermediate and 2 of deep earthquakes. (Author)

  12. Arrangement and statistics of storage containers of spent fuel for assemblies of the SFP of NPP-L V, Unit 1; Arreglo y estadistica de contenedores de almacenamiento de combustible gastado para los ensambles de la ACG de la Unidad 1 de la Central Nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Mijangos D, Z. E.; Vargas A, A. F.; Amador C, C., E-mail: zoedelfin@gmail.com [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Km 44.5 Carretera Cardel-Nautla, 91476 Laguna Verde, Alto Lucero, Veracruz (Mexico)

    2014-10-15

    This work presents the determination of assemblies of the spent fuel pool (SFP) of the nuclear power plant of Laguna Verde (NPP-L V) which are candidates to be assigned to storage containers of independent spent fuel, with the objective of liberating decay heat and to have more space in the SFP, for the store of retired assemblies of the reactors in future reloads of NPP-L V, besides that the removed assemblies of the SFP should be stored in specific containers to guarantee the physical safety of them, as well as the radiological protection to the population and the environment. The design of the containers considered in this work is to store a maximum of 69 assemblies; it has a thermal capacity of 26 kilowatts and allows storing assemblies with a minimum of 5 years of have been extracted of the reactor core. Is considered that in 2016 start the storage of the spent assemblies on the containers, the candidates assemblies to store cover from the first reload in 1991, until the assemblies deposited in the SFP in the 14 reload in 2010; therefore in 2016, such assemblies will have fulfilled with the criteria of 5 years of have been removed of the Reactor, also the 69 assemblies assigned to each container will have a resulting decay heat that does not exceed the thermal capacity of the container, but that in great percentage approximates to the same one, and this way to take full advantage of their storage capacity and thermal capacity for each container. This work also contains the arrangement to accommodate the assemblies in the containers; such arrangement is constituted by areas according to the decay heat of each assembly. (Author)

  13. Evaluation of the reduction of boron-10 in the control rods in the BWR of the Laguna Verde Central, through steady state calculations; Evaluacion de la reduccion del Boro-10 en las barras de control en los BWR de la CLV, mediante calculos en estado estacionario

    Energy Technology Data Exchange (ETDEWEB)

    Montes T, J.L.; Perusquia, R.; Hernandez, J.L.; Ramirez S, J.R. [Departamento de Sistemas Nucleares, ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2003-07-01

    One of the more important aspects related with the safety and economy in the operation of a nuclear power reactor, it is without a doubt the control of the reactivity. During the normal operation of a reactor of boiling water (BWR-Boiling Water Reactor), the control of the reactivity in the nucleus it is strongly determined by the efficiency of the control rods. In the case of the Laguna Verde Nuclear power station (CNLV) the nucleus of the reactors has 109 control rods grouped in 4 sets. The CNLV at the moment uses the CCC method (Control Cell Core) in the design of the cycle. With this method only the A2 group is used for the control of the reactivity at full power. With the purpose of quantifying the effect of the decrease of the burnable poison (B{sub 4}C) of the control rods and in particular to the effect due to the postulated lost of 10% of Boron 10, it was carried out a series of calculations of the nucleus in stationary state by means of the system of HELIOS/CM-PRESTO codes. In this work the main derived results of these 3D simulations(three dimensions) of the reactors of the CNLV are presented. It was analyzed the one behavior of the infinite neutron multiplication factor (K{sub infinite}), at fuel assemble cell level used in an equilibrium cycle for the CNLV. It was also analyzed the effect in the shutdown margin (ShutDown Margin- SDM) in cold condition CZP (Cold Zero Power). Its are also included those results of the ARI cases (All Rods In) and SRO (Strong Rod Out). From the cases in condition HFP (Hot Full Power) the behavior of the effective multiplication factor (K{sub eff}) is presented. (Author)

  14. Preliminary analysis of an hydrogen generator system based on nuclear energy in the Laguna Verde site; Analisis preliminar de un sistema generador de hidrogeno basado en energia nuclear en el sitio de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Flores y Flores, A. [FI-UNAM, 04500 Mexico D.F. (Mexico); Francois L, J.L. [FI-UNAM, Jiutepec, Morelos (Mexico)]. e-mail: alain_fyf@yahoo.com

    2003-07-01

    The shortage of fossil fuels in the next future, as well as the growing one demand of energetics and the high cost of the production of alternating fuels, it forces us to take advantage of to the maximum the fossil fuel with the one which we count and to look for the form of producing alternating fuels at a low cost and better even if these supply sources are reliable and non pollutants. It is intended a solution to the shortage of fuel; to use the thermal energy liberated of some appropriate nuclear reactor to be able to obtain a fuel but clean and relatively cheap as it is the hydrogen. In the first place the methods were looked for to produce hydrogen using thermal energy, later it was analyzed the temperature liberated by the existent nuclear reactors as well as the advanced designs, according to this liberated temperature settled down that the methods but feasible to produce hydrogen its were the one of reformed with water stream of the natural gas (methane) and the other one of the S-I thermochemical cycle, and the nuclear reactors that give the thermal energy for this production they are those of gas of high temperature. Once established the processes and the appropriate reactors, it was analyzed the site of Laguna Verde, with relationship to the free space to be able to place the reactor and the plant producer of hydrogen, as well as the direction in which blow the dominant winds and the near towns to the place, it was carried out an analysis of some explosion of tanks that could store hydrogen and the damage that its could to cause depending from the distance to which its were of the fire. Finally it was carried out an evaluation of capital and of operation costs for those two methods of hydrogen production. (Author)

  15. Simulation of overpressure events with a Laguna Verde model for the RELAP code to conditions of extended power up rate; Simulacion de eventos de sobrepresion con un modelo de Laguna Verde para el codigo RELAP a condiciones de aumento de potencia extendido

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez H, A.; Araiza M, E.; Fuentes M, L.; Ortiz V, J., E-mail: andres.rodriguez@inin.gob.mx [ININ, Departamento de Sistemas Nucleares, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2012-10-15

    In this work the main results of the simulation of overpressure events are presented using a model of the nuclear power plant of Laguna Verde developed for the RELAP/SCDAPSIM code. As starting point we have the conformation of a Laguna Verde model that represents a stationary state to similar conditions to the operation of the power station with Extended Power Up rate (EPU). The transitory of simulated pressure are compared with those documented in the Final Safety Analysis Report of Laguna Verde (FSAR). The results of the turbine shot transitory with and without by-pass of the main turbine are showed, and the event of closes of all the valves of main vapor isolation. A preliminary simulation was made and with base in the results some adjustments were made for the operation with EPU, taking into account the Operation Technical Specifications of the power station. The results of the final simulations were compared and analyzed with the content in the FSAR. The response of the power station to the transitory, reflected in the model for RELAP, was satisfactory. Finally, comments about the improvement of the model are included, for example, the response time of the protection and mitigation systems of the power station. (Author)

  16. Recent nuclear technology advances of GE-H and GNF in partnership with CFE's Laguna Verde 2

    Energy Technology Data Exchange (ETDEWEB)

    Cuevas V, G.; Iwamoto, T.; Banfield, J. [GE-Hitachi Nuclear Energy Americas LLC, Global Nuclear Fuel - Americas LLC, 3901 Castle Hayne Road, Wilmington, 28401 North Carolina (United States); Calleros M, G., E-mail: Gabriel.Cuevas-Vivas@age.com [Comision Federal de Electricidad, Central Nucleoelectrica de Laguna Verde, Carretera Veracruz-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2015-09-15

    This paper is presented based on work stemming from the long-standing technical partnership between Comision Federal de Electricidad (CFE) and Global Nuclear Fuel - Americas LLC (GNF), and this paper's purpose is to provide valuable information for the nuclear industry. First, a one-to-one comparison of measurements from Gamma Thermometers (G Ts) installed in Laguna Verde 2 (LV-2) core against axially corresponding Traverse In-core Probe (Tip) measurements is remarkably close. This longest running G T plant validation for the Economic Simplified Boiling Water Reactor (ESBWR) power monitoring devices is also proving that the devices have the potential to simplify power measurements in Boiling Water Reactors (BWRs). Second, code validation results show remarkable reduction of radial power uncertainty with respect to current technology when new GNF codes for three-dimensional core simulations are compared to Tip power measurements. The LV-2 core is of paramount importance for BWR data analysis since the core has been loaded from the start of operation with different GNF fuel bundle types, fuel management has been designed with GNF codes and on-line core monitoring has been performed with GNF's 3-Dimensional Monicore system. This validation is also reliable since gamma Tips are used for local power measurements rather than thermal neutron Tips, which are more sensitive to local turbulence and positional changes. A nuclear/thermal-hydraulic core simulation of GNF fuel is undertaken from the beginning of operation of LV-2 (cycle 1) through the range of different power scenarios including low power, original licensed thermal power, power up rate and extended power up rate. Results confirm the conclusions from previous validations in different BWRs and support GNF efforts for licensing the new generation of nuclear engineering codes. (Author)

  17. Training in fundamentals of radiological coverage in Laguna Verde NPP; Entrenamiento de fundamentos de coberturas radiologicas en la CLV

    Energy Technology Data Exchange (ETDEWEB)

    Lara H, M. A., E-mail: marcolarah@gmail.com [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km. 42.5, Alto Lucero, Veracruz (Mexico)

    2014-10-15

    In 2010, the Institute of Nuclear Power Operations (INPO) celebrates the Knowledge Transfer and Retention Workshop, an event where nuclear regulators and operators presented the strategies that various NPP to worldwide were implemented to mitigate the consequences of this generational change and take advantage of it, the trend in the presented works was the same: the generational change occurs in a faster way that the transfer of knowledge, the future was already here and many NPP had not been adequately prepared to train its nuclear technicians and engineers in the tasks demanded by the industry of them, so in addition to preparing these workers to forced marches was necessary to establish strategies to retain at more experienced staff in the industry. The Laguna Verde NPP has not been exempt to this process; the preparation of personnel squares to replace those that reaching retirement age in the Comision Federal de Electricidad (CFE) has become extensive in the last five years, sometimes leading to have personnel covering functions without an alternate to the next lower position, the cause? Not enough staff. In the specific case of radiation protection (Rp) the time required for obtaining the status of Rp technician according to the ANSI/ANS 3.1 standard is 2 years, one of the tasks that most occupies part of these two years is training in radiological coverage, this training requires a mix of knowledge and experience, recently one of the concepts used for training in Rp is the evaluation and management of the radiological risk, topic that is considered in this technical work. (Author)

  18. A Case Study of Nearshore Wave Transformation Processes along the Coast of Mexico near the Laguna Verde Nuclear Power Plant Using a Fast Simulation Method

    Directory of Open Access Journals (Sweden)

    Israel-Enrique Herrera-Díaz

    2010-01-01

    numerical method was developed using a split proposed version of the mild-slope equation and solved by an implicit method in a finite volume grid; this technique easily allows model the wave effects caused by the breakwater building in coastal waters, where industrial and other economic activities take place. Controlled case studies have been made and the results match very well with the reference solution. The capability and utility of the model for real coastal areas are illustrated by application to the breakwater of the Laguna Verde Nuclear Power Plant (LVNPP.

  19. Cause-Effect relationship of the Laguna Verde BWR power instability by empirical mode decomposition; Relacion efecto-causa de la inestabilidad de potencia del BWR de Laguna Verde por descomposicion modal empirica

    Energy Technology Data Exchange (ETDEWEB)

    Blazquez, J.; Ruiz, J.; Castillo, R. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2008-07-01

    The signals coming from natural phenomena are in essence non lineal and not stationary. A recent development, well-known as Empirical Mode Decomposition (EMD) it presents a novel focus that allows to represent in adaptative form non stationary signals as a sum of components of half zero. These components denominated Intrinsic Mode Functions (IMF) they help to the analysis of the frequency composition of unidimensional signals. The use of the EMD followed by the Hilbert transform of the IMFs it allows to carry out an analysis in time-frequency of the non lineal and not stationary data. This technique is known as the Hilbert Huang Transform (HHT). In this work a power instability event occurred in January 24, 1995 in the unit I of the nuclear power station of Laguna Verde (Mexico), corresponding to a BWR/5 is analyzed. When a Nuclear Plant suffers a power instability event, it is required obligatorily to explain to the Regulator Organism the effects and the causes of the event. The effects are described simply; not in vain there is a registration of signals in the Process Computer of where the required information is extracted. But the causes are not always immediate and easy for to identify. The power instability can happen during the start, when the refrigeration flow is relatively low in front to the power. By reason of that the reactivity coefficient by holes is negative, the power oscillates with a very defined frequency, generally of the order of 0.5 Hz. If the oscillations increase progressively of amplitude, we are in an instability event. It is interesting to include in the report the instant in that the began instability and the actions of the operator before and after the same one. As the actions are registered, the investigation is focused toward the instant of the beginning to be able to identify them. In this work the power signal in five empiric ways of Hilbert-Huang and a residual breaks down. The instability is only reflected in the way of smaller

  20. Technical assistance in relationship with the reloading analysis of the Laguna Verde Unit 2 reactor. Executive abstract; Asistencia tecnica en relacion con el analisis de recargas de la CNLV U-2

    Energy Technology Data Exchange (ETDEWEB)

    Alonso V, G.; Castro B, M.; Gallegos E, R.; Hernandez L, H.; Montes T, J.L.; Ortiz S, J. J.; Perusquia C, R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1993-11-15

    The objective of the report was to carry out a comparative analysis of costs of energy generation among the designs GE9B of General Electric, 9X9-IX of SIEMENS and SVEA-96 of ABB ATOM, proposed to be used as recharge fuel in the Unit 2 of the Laguna Verde Nuclear Power station. (Author)

  1. Simulation of an operation cycle of nuclear power plant of Laguna Verde with code TACHY and computation package CMS; Simulacion de un ciclo de operacion de la CNLV con el codigo TACHY y el paquete de computo CMS

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, J. A.; Del Valle, E.; Vargas, S.; Xolocostli, J. V. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)], e-mail: joseangel.gonzalez@inin.gob.mx

    2009-10-15

    In this work the code TACHY is used, to simulate an operation cycle of the nuclear power plant of Laguna Verde. The code TACHY was designed originally to analyze recharge patterns of Hindu plants type BWR, that have near 800 assemblies, that is almost double the reactor of nuclear power plant of Laguna Verde. For this reason it was necessary to modify the code to be able to apply it to nuclear power plant of Laguna Verde. The values were modified like: operation power, entrance subcooling, flow through the nucleus, assemblies number in nucleus and dimensions of nucleus. In this work is take like base the cycle 9 of Unit 2 of nuclear power plant of Laguna Verde. This cycle is simulated with code TACHY and with code SIMULATE-3 that is part of computation package Core Management System, with the purpose of comparing the results. The results that are compared with the two codes, for the complete nucleus are: the burnt average of nucleus, the cycle longitude, the effective factor of neutrons multiplication, the pick of radial relative power; and for each assembly: the burnt and the relative power. Of the results obtained with TACHY we can conclude that we have a computation tool that allows to analyze a great number of recharge patterns in a reasonable time. (Author)

  2. Fuel management inside the reactor. Report of generation of the nuclear bank for the fuel of the initial load of the Laguna Verde U-1 reactor with the FMS codes; Administracion de combustible dentro del reactor. Reporte de generacion del banco nuclear para el combustible de la carga inicial del reactor de Laguna Verde U-1 con los codigos del FMS

    Energy Technology Data Exchange (ETDEWEB)

    Alonso V, G. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Torres A, C. [CFE, Veracruz (Mexico)

    1991-06-15

    In this work in a general way the form in that it was generated the database of the initial fuel load of the Laguna Verde Unit 1 reactor is described. The initial load is formed with fuel of the GE6 type. The obtained results during the formation of the database in as much as to the behavior of the different cell parameters regarding the one burnt of the fuel and the variation of vacuums in the coolant channel its are compared very favorably with those reported by the General Electric fuel supplier and reported in the design documents of the same one. (Author)

  3. Neotectonic morphotructures in the junction zone of the Cape Verde Rise and Cape Verde Abyssal Plain, Central Atlantic

    Science.gov (United States)

    Skolotnev, S. G.; Kolodyazhny, S. Yu.; Tsukanov, N. V.; Chamov, N. P.; Sokolov, S. Yu.

    2009-01-01

    Acoustic profiling carried out with an Edgetech 3300 prophilograph in the junction zone of the Cape Verde Rise, Cape Verde Abyssal Plain, and Grimaldi and Bathymetrists seamounts in the Central Atlantic during Cruise 23 of the R/V Akademik Nikolaj Strakhov allowed us to obtain new data on neotectonic deformations in the ocean and to propose their interpretation. It has been established that neotectonic movements occurred in the discrete manner: blocks of undeformed rocks alternate with linear zones of intense deformation spatially related to paleotransform fracture zones, where anticlines, horsts, diapir-like morphostructures, and grabens were formed. The Cape Verde Ridge is a large horst. Its sedimentary cover is disturbed by thrust (?), reverse, and normal faults, steeply dipping fracture zones, and folds. Three stages of tectonic movements—Oligocene-early Miocene, pre-Quaternary, and Holocene—are recognized. The tectonic deformations occurred largely under near-meridional compression. Extension setting was characteristic of the Cape Verde Ridge and the Carter Rise in the Holocene.

  4. Analysis of the documents about the core envelopment of nuclear reactor at the Laguna Verde U-1 power plant; Analisis de documentos de los materiales de la envolvente del nucleo del reactor nuclear de la CLV U-1

    Energy Technology Data Exchange (ETDEWEB)

    Zamora R, L.; Medina F, A. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1999-07-01

    The degradation of internal components at BWR type reactors is an important subject to consider in the performance availability of the power plant. The Wuergassen nuclear reactor license was confiscated due to the presence of cracking in the core envelopment. In consequence it is necessary carrying out a detailed study with the purpose to avoid these problems in the future. This report presents a review and analysis of documents and technical information referring to the core envelopment of a BWR/5/6 and the Laguna Verde Unit 1 nuclear reactor in Mexico. In this document are presented design data, documents about fabrication processes, and manufacturing of core envelopment. (Author)

  5. A mathematical model; Un modelo matematico para el comportamiento de la radiosensibilidad medida con la viabilidad huevo-adulto de Drosophila melanogaster y D. simulans de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Castillo M, J.A.; Pimentel P, A.E. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    This work presents the results to define the adult egg viability behavior (VHA) of two species, Drosophila melanogaster and D. simulans obtained with the mathematical model proposed, as well as the respective curves. The data are the VHA result of both species coming from the vicinity of the Laguna Verde Nuclear Power plant (CNLV) comprise a 10 years collect period starting from 1987 until 1997. Each collect includes four series of data which are the VHA result obtained after treatment with 0, 4, 6 and 8 Gy of gamma rays. (Author)

  6. Range of the radiation monitor for the rigid vent of primary containment during normal and emergency operation for a BWR-5 in Laguna Verde; Rango del monitor de radiacion para el venteo rigido de la contencion primaria durante operacion normal y emergencia para un reactor BWR-5 en Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Tijerina S, F.; Pozos S, A. M.; Cabrera U, S.; Mata A, J. A.; Sandoval V, S.; Ovando C, R.; Vargas A, A.; Gallardo R, I.; Cruz G, M.; Amador C, C., E-mail: francisco.tijerina@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Km 44.5 Carretera Cardel-Nautla, 91476 Laguna Verde, Alto Lucero, Veracruz (Mexico)

    2014-10-15

    The earthquake followed by a tsunami, happened in March, 2011 in the coasts of oriental Japan, caused damages in the nuclear power plants 1 at 4 of Fukushima Daiichi leading to damage of the fuel in three of the reactors and to the radiation liberation to the exterior. As consequence of those events, the regulations requires that the power plants with Primary Containment type Mark I and II evaluate to have a system of rigid vent with a monitoring equipment of radiation effluents. The present work covers the rigid vent of diameter 12 of the Primary Containment, type Mark-II, of nuclear power plant of Laguna Verde in conditions of severe accident and normal operation, low regime of Extended Power Up rate (EPU - 2317 MWt), using the codes MAAP3B, MICROSHILED 5.05 and the Bardach Black Boxes methodology. As a result the measurement range of the radiation monitor that is required for monitoring the gassy liberation to the atmosphere was determined. The conclusion is that the superior limit of the range of the radiation meter during a Severe Accident is of 8.55 E + 05 R/h (8.55 E + 08 m R/h) and the superior limit in normal operation of 1.412 E-11 at 2.540 E-7 R/h (1.412 E-14 at 2.540 E-10 m R/h). (Author)

  7. Analysis of the evolution of reactivity of the event at 24/01/1995 of the BWR U-1 of Laguna Verde; Analisis de la evolucion de la reactividad del evento del 24/01/1995 del BWR U-1 de Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz E, J.A. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Blazquez M, J. [CIEMAT, 28040 Madrid (Spain)]. e-mail: jare@nuclear.inin.mx

    2003-07-01

    In this work it is looked for, to calculate the reactivity starting from the measures of the one nuclear detection system denominated by their initials in English 'APRM' (Average Power Range Monitor) of the oscillatory event of the unit 1 of the nuclear power station of Laguna Verde happened the 24/01/1995. The reference signal consists of 3589 points taken every 0.2 seconds before the reactor operator carried out the cut of the same one. It is tried to give answer to queries like: When the event really began?, How distinguishing the stable part of the unstable? Which could be the way of predicting it?. The analysis is developed applying the call 'inverse method', with the purpose of interpreting the power response, having a mean of obtaining the information about the changes of reactivity that were given in the transitory one and to look their relationship with the actions taken by the operator. A comparison of the variation of the signal of reactivity with basic statistical variables with the purpose of trying of to find a mechanism for early detection of the instability is included. (Author)

  8. Environmental evidence of fossil fuel pollution in Laguna Chica de San Pedro lake sediments (Central Chile)

    Energy Technology Data Exchange (ETDEWEB)

    Chirinos, L. [Centro de Ciencias Ambientales EULA-Chile, Universidad de Concepcion, PO Box 160-C, Concepcion (Chile)]. E-mail: lchirin@pucp.edu.pe; Rose, N.L. [Environmental Change Research Centre, University College London, 26 Bedford Way, London WG1HOAP (United Kingdom); Urrutia, R. [Centro de Ciencias Ambientales EULA-Chile, Universidad de Concepcion, PO Box 160-C, Concepcion (Chile); Munoz, P. [Departamento de Biologia Marina, Universidad Catolica del Norte, Larrondo 1281, Coquimbo (Chile); Torrejon, F. [Centro de Ciencias Ambientales EULA-Chile, Universidad de Concepcion, PO Box 160-C, Concepcion (Chile); Torres, L. [Departamento de Botanica, Universidad de Concepcion, Concepcion (Chile); Cruces, F. [Departamento de Botanica, Universidad de Concepcion, Concepcion (Chile); Araneda, A. [Centro de Ciencias Ambientales EULA-Chile, Universidad de Concepcion, PO Box 160-C, Concepcion (Chile); Zaror, C. [Facultad de Ingenieria Quimica, Universidad de Concepcion, Concepcion (Chile)

    2006-05-15

    This paper describes lake sediment spheroidal carbonaceous particle (SCP) profiles from Laguna Chica San Pedro, located in the Biobio Region, Chile (36{sup o} 51' S, 73{sup o} 05' W). The earliest presence of SCPs was found at 16 cm depth, corresponding to the 1915-1937 period, at the very onset of industrial activities in the study area. No SCPs were found at lower depths. SCP concentrations in Laguna Chica San Pedro lake sediments were directly related to local industrial activities. Moreover, no SCPs were found in Galletue lake (38{sup o} 41' S, 71{sup o} 17.5' W), a pristine high mountain water body used here as a reference site, suggesting that contribution from long distance atmospheric transport could be neglected, unlike published data from remote Northern Hemisphere lakes. These results are the first SCP sediment profiles from Chile, showing a direct relationship with fossil fuel consumption in the region. Cores were dated using the {sup 21}Pb technique. - The lake sediment record of SCPs shows the record of fossil-fuel derived pollution in Central Chile.

  9. Rehabilitation and modernization project of units 1 and 2 of Laguna Verde Nuclear Power Plant. A strengthening project to 120%. (2nd phase); Proyecto de rehabilitacion y modernizacion de las Unidades 1and 2 de la CNLV. Un proyecto de reponteciacion al 120% (2ª Fase)

    Energy Technology Data Exchange (ETDEWEB)

    Liebana, B.; Merino, A.; Garcia, J. L.; Gomez, M.; Martinez, I.; Ruiz, L.

    2010-07-01

    The power increase of the Laguna Verde Nuclear Power Plant is a project for the rehabilitation and modernization of the turbo and associated equipment to get an increase of its power and of its service life. The project scope includes the design, the engineering, the equipment supply, the installation, the testing and the commissioning. This article presents the work of the second phase.

  10. Atmospheric emissions control at ENELVEN`s Ramon Laguna thermal power plant; Control de emisiones a la atmosfera en la central termoelectrica Ramon Laguna de ENELVEN

    Energy Technology Data Exchange (ETDEWEB)

    Rincon Rincon, Edis Rafael [Empresa de Servicio Electrico (ENELVEN), (Venezuela)

    1996-12-31

    ENELVEN is an electric utility that covers the areas of generation, transmission and distribution of the Western an South coast of the Maracaibo Lake of the Zulia State, Venezuela. General aspects of the Ramon Laguna of ENELVEN fossil power plant are presented, as well as the environmental measures implanted in this power station to avoid detrimental effects on the environment that could be caused by the emission of combustion products without the appropriate control, such as particulate matter, sulfur oxides, nitrogen oxides and carbon oxides [Espanol] ENELVEN es una empresa de servicio electrico que cubre las areas de generacion, transmision y distribucion de la Costa Occidental y Sur del Lago de Maracaibo, del Estado Zulia, Venezuela. Se presentan aspectos generales de la planta termoelectrica Ramon Laguna de la empresa ENELVEN, asi como las medidas ambientales implantadas en esta central para evitar efectos adversos sobre el ambiente que pudieran producirse por la emision de productos de la combustion si no existiera el debido control, tales como: particulas, oxidos de azufre, oxidos de nitrogeno y oxidos de carbono

  11. Application of new control technology during the maintenance of equipment in the Laguna Verde nuclear power plant; Aplicacion de nueva tecnologia de control durante el mantenimiento de equipos en la CLV

    Energy Technology Data Exchange (ETDEWEB)

    Ojeda R, M. A. [CFE, Central Laguna Verde, Subgerencia General de Operacion, Veracruz (Mexico)]. e-mail: mario.ojeda@cfe.gob.mx

    2008-07-01

    In the nuclear power plant of Laguna Verde, in normal operation and recharges are carried out activities of preventive maintenance and corrective to different equipment, due to the one displacement of radioactive materials from the vessel of the reactor until the one system of vapor, different radiation levels are generated (from low until very high) in the circuits of vapor and water, the particles can be incrusted on those interior surfaces of the pipes and equipment, creating this way a potential risk of contamination and exhibition during the maintenance of equipment. To help to optimize the dose to the personnel the use of new technology the has been implemented which besides contributing an absolute control of the work, it offers bigger comfort to the one worker during the development of their work, also contributing a supervision more effective of the same one. Using the captured and processed information of the work developed you can use for the personnel's capacitation and feedback of the work for the continuous improvement of the same one. During a reduction of programmed power and normal operation are carried out maintenance correctives and specific works to preserve the readiness and ability of the equipment and with this to maintain the security of the nuclear power plant. The development of the theme it is showing the advances and commitments of personnel to take to excellence to the nuclear power plant of Laguna Verde showing to the obtained results of the dose and benefits of 2 works carried out in the nuclear power plant where tools ALARA were applied as well as the use of the new technology (Video Equipment of Tele dosimetry and Audio 'VETA') in works carried out in the building of purification level 10.15, change and cuts of filter of the prefilters of system G16, as well as,the retirement and transfer for its decay of High Integrity Container (HIC) of the building of purification level -0.55 to the Temporary Warehouse in Site

  12. Estimate of radiation-induced steel embrittlement in the BWR core shroud and vessel wall from reactor-grade MOX/UOX fuel for the nuclear power plant at Laguna Verde, Veracruz, Mexico

    Science.gov (United States)

    Vickers, Lisa Rene

    The government of Mexico has expressed interest to utilize the Laguna Verde boiling water reactor (BWR) nuclear power plant for the disposition of reprocessed spent uranium oxide (UOX) fuel in the form of reactor-grade mixed-oxide (MOX) fuel. MOX fuel would replace spent UOX fuel as a fraction in the core from 18--30% depending on the fuel loading cycle. MOX fuel is expected to increase the neutron fluence, flux, fuel centerline temperature, reactor core pressure, and yield higher energy neutrons. There is concern that a core with a fraction of MOX fuel (i.e., increased 239Pu wt%) would increase the radiation-induced steel embrittlement within the core shroud and vessel wall as compared to only conventional, enriched UOX fuel in the core. The evaluation of radiation-induced steel embrittlement within the core shroud and vessel wall is a concern because of the potentially adverse affect to plant and public safety, environment, and operating life of the reactor. This dissertation provides computational results of the neutron fluence, flux, energy spectrum, and radiation damage displacements per atom per second (dpa-s-1) in steel within the core shroud and vessel wall of the Laguna Verde Unit 1 BWR. The results were computed using the nuclear data processing code NJOY99 and the continuous energy Monte Carlo Neutral Particle transport code MCNP4B. The MCNP4B model of the reactor core was for maximum core loading fractions of ⅓ MOX and ⅔ UOX reactor-grade fuel in an equilibrium core. The primary conclusion of this dissertation was that the addition of the maximum fraction of ⅓ MOX fuel to the LV1 BWR core did significantly accelerate the radiation-induced steel embrittlement such that without mitigation of steel embrittlement by periodic thermal annealing or reduction in operating parameters such as, neutron fluence, core temperature and pressure, it posed a potentially adverse affect to the plant and public safety, environment, and operating life of the reactor.

  13. Magnetotelluric Studies of the Laguna del Maule Volcanic Field, Central Chile

    Science.gov (United States)

    Cordell, D. R.; Unsworth, M. J.; Diaz, D.; Pavez, M.; Blanco, B.

    2015-12-01

    Geodetic data has shown that the surface of the Laguna del Maule (LdM) volcanic field in central Chile has been moving upwards at rates >20 cm/yr since 2007 over a 200 km2 area. It has been hypothesized that this ground deformation is due to the inflation of a magma body at ~5 km depth beneath the lake (2.8 km b.s.l.). This magma body is a likely source for the large number of rhyolitic eruptions at this location over the last 25 ka. A dense broadband magnetotelluric (MT) array was collected from 2009 to 2015 and included data from a geothermal exploration project. MT phase tensor analysis indicates that the resistivity structure of the region is largely three-dimensional for signals with periods longer than 1 s, which corresponds to depths >5 km. The MT data were inverted using the ModEM inversion algorithm to produce a three-dimensional electrical resistivity model which included topography. Four primary features were identified in the model: 1) A north-south striking, 10 km by 5 km, low-resistivity zone (inflation centre at a depth of ~5 km (2.8 km b.s.l.) is interpreted as a zone of partial melt which may be supplying material via conduits to account for the observed ground deformation; 2) A shallow low-resistivity feature ~400 m beneath the lake surface (1.8 km a.s.l.) and spatially coincident with the inflation centre is interpreted to be a zone of hydrothermal alteration; 3) A thin, low-resistivity feature to the west of LdM at a depth of ~250 m (2.2 km a.s.l.) is interpreted to be the clay cap of a potential geothermal prospect; 4) A large, low-resistivity zone beneath the San Pedro-Tatara Volcanic Complex to the west of LdM at a depth of ~10 km (8 km b.s.l.) is interpreted to be a zone of partial melt. Further MT data collection is planned for 2016 which will expand the current grid of MT stations to better constrain the lateral extent of the observed features and give greater insight into the dynamics of this restless magma system.

  14. Water resources on the Pueblo of Laguna, west-central New Mexico

    Science.gov (United States)

    Risser, D.W.; Lyford, F.P.

    1983-01-01

    This study evaluates the quality and quantity of water available on the Pueblo of Laguna, New Mexico. Groundwater for public supply occurs in the valley fill along the Rio San Jose, in the Paguate and Encinal areas, and possibly in the northern part of the Sedillo Grant. The valley fill in the Rio San Jose will supply 50 to 450 gallons per minute of potable water to properly constructed wells. In the alluvium along Rio Paguate, additional development of as much as 250 gallons per minute is possible. Groundwater for irrigation is restricted by available yields and quality to the valley fill along the Rio San Jose and possibly the western part of the Major 's Ranch area. In the Rio San Jose valley yields of 50 to 450 gallons per minute of water containing 500 to 3,000 milligrams per liter are possible. Digital-model simulations of the valley-fill aquifer west of the Village of Laguna show a potential salvage of as much as 900 acre-feet per year of evapotranspiration losses if water levels are lowered. Model studies also indicate that the winter flow of the Rio San Jose could be used to recharge groundwater stored in the valley. (USGS)

  15. Análisis prospectivo del conflicto político ambiental, sobre el uso del espacio público Parque La Laguna, localizado en la Urbanización Nueva Casarapa, Estado Miranda.Venezuela

    Directory of Open Access Journals (Sweden)

    Mildred Zerpa

    2013-06-01

    Full Text Available Nueva Casarapa, es un complejo urbanístico integral concebido bajo el concepto de ciudad. Posee espacios abiertos, centros comerciales, espacios verdes y públicos cuidados por los propios habitantes y un parque central conocido como La Laguna. En 2009 comenzó una polémica que podría convertirse en conflicto socio natural con implicaciones en la gestión integral de riesgo del Municipio Plaza, por la incertidumbre acerca de cuál grupo es el más indicado para administrar y gestionar el parque La Laguna.

  16. Analysis of the noise of the jet pumps of the Unit 2 of the Laguna Verde nuclear power plant; Analisis de ruido de las bombas de chorro de la Unidad 2 de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Castillo D, R.; Ortiz V, J.; Ruiz E, J.A. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Calleros M, G. [CFE, Central Nucleoelectrica de Laguna Verde, Alto Lucero, Veracruz (Mexico)]. E-mail: rcd@nuclear.inin-mx

    2004-07-01

    The use of the analysis of noise for the detection of badly functioning of the components of a BWR it is a powerful tool in the determination of abnormal conditions of operation, during the life of a nuclear plant of power. From the eighties, some nuclear reactors have presented problems related with the jet pumps and the knots of the recirculation. The Regulatory Commission of the United States, in the I E bulletin 80-07, recommended to carry out a periodic supervision of the pressure drop of the jet pumps, to prevent structural failures. In this work, methods of analysis of noise are used for the detection of abnormal conditions of operation of the jet pumps of a BWR. Signals are analysed to low and high frequency of pressure drop with the NOISE software that is in development. The obtained results show the behavior of the jet pumps of jet 6 and 11 before and after a partial blockade in their throats where the pump 6 return to their condition of previous operation and the pump 11 present a new fall of pressure, inside the limit them permissible of operation. The methodology of the analysis of noise demonstrated to be an useful tool for the badly functioning detection, and you could apply to create a database to supervise the dynamic behavior of the jet pumps of an BWR. (Author)

  17. Approach to criticality in cold core of the Unit 1 of the cycle 10 of the Laguna Verde power plant with control rods similar in design to the original ones and the advanced ones; Aproximacion a criticidad en frio de la Unidad 1 del ciclo 10 de la CLV con barras de control de diseno similar al original y avanzadas

    Energy Technology Data Exchange (ETDEWEB)

    Perusquia, R.; Ramirez, J.R.; Ortiz, J.J.; Hernandez, J.L.; Montes, J.L. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico)]. E-mail: rpc@nuclear.inin.mx

    2004-07-01

    In the Laguna Verde power plant (CLV) worn out control bars have been replacing for control rods of advanced design. At the moment of the 109 rods of similar design to the original of the Unit 1 of the CLV, 14 of them have been substituted with two types of different advanced control rods. The same as the original rods the advanced rods use boron carbide as control element for neutrons, but additionally they use hafnium, to achieve a longer useful half life. The rods of similar design to the original are homogeneous axially on the other hand the advanced presenting several zones. In principle the advanced rods were designed to be neutronically compatible to the original rods. However the differences in the design and of constituents assumed to consider a different performance during the operation. Since the one numbers of advanced bars is growing with the number of cycles of the CLV reactor has requested to the National Institute of Nuclear Research (ININ) to evaluate in detailed form the performance of the control rods. Previously the calculations and analysis of cycle design that that were carried out assumed that control rods should be of similar design as the original. Using the HELIOS/CM-LENDS system, the effect of the inclusion of advanced rods was analyzed in the approximation of the criticality in cold (20 C) in the cycle 10 of the Unit 1. Four scenarios were poposed, where the type of the rod of substitution control is varied. The value of reactivity was calculated for the rods similar in design to the original and for the advanced one. By comparison of these values, it was found that the value of reactivity of the control rods of the advanced design was superior to the value for rods similar to the original ones by 7.6% for one of the advanced designs and of 13.6% for the other one. (Author)

  18. Aquifer tests at the Jackpile-Paguate uranium mine, Pueblo of Laguna, west-central New Mexico

    Science.gov (United States)

    Risser, D.W.; Davis, P.A.; Baldwin, J.A.; McaAda, D.P.

    1984-01-01

    The transmissivity of the Jackpile sandstone bed in the Brushy Basin Shale Member of the Morrison Formation, west-central New Mexico, was determined to be 24 sq ft/day at well M2 and 47 sq ft/day at well M3 from constant-discharge aquifer tests conducted at the Jackpile-Paguate Uranium Mine. The storage coefficient of the Jackpile sandstone bed was estimated to be 0.00018 at well M2 and 0.00029 at well M3 from the same tests. An aquifer test conducted at well M21 indicated the transmissivity of the Jackpile sandstone bed was 2.0 sq ft/day and the storage coefficient was 0.00002. The transmissivity of an unnamed sandstone bed in the Brushy Basin Shale Member of the Morrison Formation was estimated from ' slug-test ' results to be about 20 sq ft/day. Water levels in this sandstone probably did not change due to pumping from the overlying Jackpile sandstone bed for 88 hours at an average discharge of 15.3 gallons/min. A constant discharge aquifer test at well M4C indicated that the transmissivity of the alluvium at this location was about 430 sq ft/day. Water levels in the underlying Jackpile sandstone bed began declining within 15 minutes after withdrawals of groundwater from the alluvial aquifer began. (USGS)

  19. The Pueblo of Laguna.

    Science.gov (United States)

    Lockart, Barbetta L.

    Proximity to urban areas, a high employment rate, development of natural resources and high academic achievement are all serving to bring Laguna Pueblo to a period of rapid change on the reservation. While working to realize its potential in the areas of natural resources, commercialism and education, the Pueblo must also confront the problems of…

  20. Implementation of a thermal hydraulic oscillations suppression system attached to neutronic (OPRM), in the Unit 2 of the Laguna Verde Central, for cycles 7 and 8; Implementacion del sistema de supresion de oscilaciones termohidraulicas acopladas a la neutronica (OPRM), en la Unidad 2 de la Central Laguna Verde, para ciclos 7 y 8

    Energy Technology Data Exchange (ETDEWEB)

    Calleros M, G.; Zapata Y, M.; Mendez M, A.; Gomez H, R.A. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: gcm9acpp@cfe.gob.mx

    2007-07-01

    This work approaches the topic of the implementation in the Reactor 2 of the CLV, of the detection and suppression of thermal hydraulics oscillations method coupled to the neutronic of a BWR. This method is contemplated in the Oscillations Power Range Monitor (OPRM) incorporate to the system of Monitoring in Range of Power Average (APRM), which analyzes the signs coming from the readings of the 96 detectors in local power range (LPRM), to determine if instability exists in the reactor. The suppression carried out by the OPRM is of sudden out reactor (SCRAM), to the one to determine that the filtered signals surpass the adjustment points of some of the three algorithms: based on Period, in width and in growth ratio. (Author)

  1. Laguna Atascosa Wilderness study area

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a brief report on a wilderness study area located in the Laguna Atascosa National Wildlife Refuge. It discusses the history of the study area, its...

  2. Mesa Verde Archaeoastronomy

    Science.gov (United States)

    Munson, Gregory E.

    Mesa Verde archaeoastronomy has been studied for over 100 years through academic research. Investigators have excavated, stabilized, and documented the major dwellings in Mesa Verde National Park. Evidence for astronomical orientation and alignment was found in Cliff Palace and Sun Temple. The level of documentation increased with each new research project. With good documentation practices, together, the research has shown that the cultures of the Mesa Verde were advanced in their social organization and use of astronomy. Consultation with Native American tribal leaders will add significant background to the depth of knowledge that their ancestors possessed.

  3. The LAGUNA-LBNO Project

    Science.gov (United States)

    Avanzini, Margherita Buizza

    LAGUNA-LBNO is a Design Study funded by the European Commission to develop the design of a large and deep underground neutrino observatory; its physics program involves the study of neutrino oscillations at long baselines, the investigation of the Grand Unification of elementary forces and the detection of neutrinos from astrophysical sources. Building on the successful format and on the findings of the previous LAGUNA Design Study, LAGUNA-LBNO is more focused and is specifically considering Long Baseline Neutrino Oscillations (LBNO) with neutrino beams from CERN. Two sites, Fréjus (in France at 130 km) and Pyhäsalmi (in Finland at 2300 km), are being considered. Three different detector technologies are being studied: Water Cherenkov, Liquid Scintillator and Liquid Argon. Recently the LAGUNA-LBNO consortium has submitted an Expression of Interest for a very long baseline neutrino experiment, selecting as a first priority the option of a Liquid Argon detector at Pyhäsalmi. Detailed potential studies have been curried out for the determination of the neutrino Mass Hierarchy and the discovery of the CP-violation, using a conventional neutrino beam from the CERN SPS with a power of 750 kW.

  4. Variables Affecting Change at Laguna Elementary School.

    Science.gov (United States)

    Lockart, Barbetta L.

    After nearly 14 years of non-Indian administration, Laguna Elementary School (LES) has acquired a principal and a teacher supervisor who are not merely Indian, but of the Laguna Tribe itself, making LES the only school in the Southern Pueblos Agency with Tribal members as administrators. At first glance the situation is ideal, but there are…

  5. Statistical analysis of the wind around a nuclear power plant; Analisis estadistico del viento alrededor de una central nucleoelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Tejeda, A; Alvarez, Oscar; Contreras, A. D.; Jauregui, E. [Universidad Veracruzana, (Mexico)

    1996-12-31

    In order to show an appropriate methodology for the climatic analysis of the wind, some of the recent results in the investigation of the field flow around the Laguna Verde Nuclear Power Station, at Veracruz State (Mexico,) through the angular correlation coefficients and contingency tables among the registered wind directions by a meteorological tower at the levels of 10 and 60 meters high are presented. Finally, by applying an objective analysis of the data some conclusions are obtained in connection with the local winds with the mesoscale systems. [Espanol] Con el objeto de mostrar una metodologia apropiada en el analisis climatico del viento, se presentan algunos resultados recientes en la investigacion del campo de flujo en los alrededores de la central nucleoelectrica de Laguna Verde, Veracruz (Mexico), a traves de los coeficientes de correlacion angulares y de tablas de contingencia entre las direcciones del viento registradas por una torre meteorologica en los niveles de 10 y 60 metros de altura. Finalmente, aplicando analisis objetivo de los datos, se obtienen algunas conclusiones sobre la conexion de los vientos locales con los sistemas de mesoescala.

  6. Simulated effects of groundwater pumping and artificial recharge on surface-water resources and riparian vegetation in the Verde Valley sub-basin, Central Arizona

    Science.gov (United States)

    Leake, Stanley A.; Pool, Donald R.

    2010-01-01

    In the Verde Valley sub-basin, groundwater use has increased in recent decades. Residents and stakeholders in the area have established several groups to help in planning for sustainability of water and other resources of the area. One of the issues of concern is the effect of groundwater pumping in the sub-basin on surface water and on groundwater-dependent riparian vegetation. The Northern Arizona Regional Groundwater-Flow Model by Pool and others (in press) is the most comprehensive and up-to-date tool available to understand the effects of groundwater pumping in the sub-basin. Using a procedure by Leake and others (2008), this model was modified and used to calculate effects of groundwater pumping on surface-water flow and evapotranspiration for areas in the sub-basin. This report presents results for the upper two model layers for pumping durations of 10 and 50 years. Results are in the form of maps that indicate the fraction of the well pumping rate that can be accounted for as the combined effect of reduced surface-water flow and evapotranspiration. In general, the highest and most rapid responses to pumping were computed to occur near surface-water features simulated in the modified model, but results are not uniform along these features. The results are intended to indicate general patterns of model-computed response over large areas. For site-specific projects, improved results may require detailed studies of the local hydrologic conditions and a refinement of the modified model in the area of interest.

  7. 2013 Tres Lagunas Post Fire, 1

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  8. 2013 Tres Lagunas Post Fire, 37

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  9. Summary : Laguna Atascosa Wilderness study area

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a very brief report on the area designated as the Laguna Atascosa Wilderness study area. Topics covered include the area's history, its land status,...

  10. Laguna Atascosa National Wildlife Refuge photographs

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a collection of photographs from Laguna Atascosa National Wildlife Refuge. The photographs show the typical terrain found within the refuge.

  11. 2013 Tres Lagunas Post Fire, 21

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  12. 2013 Tres Lagunas Post Fire, 17

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  13. 2013 Tres Lagunas Post Fire, 4

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  14. 2013 Tres Lagunas Post Fire, 2

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  15. 2013 Tres Lagunas Post Fire, 11

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  16. 2013 Tres Lagunas Post Fire, 20

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  17. 2013 Tres Lagunas Post Fire, 7

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  18. 2013 Tres Lagunas Post Fire, 31

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  19. 2013 Tres Lagunas Post Fire, 15

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  20. 2013 Tres Lagunas Post Fire, 34

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  1. 2013 Tres Lagunas Post Fire, 10

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  2. 2013 Tres Lagunas Post Fire, 8

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  3. 2013 Tres Lagunas Post Fire, 22

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  4. 2013 Tres Lagunas Post Fire, 36

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  5. 2013 Tres Lagunas Post Fire, 23

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  6. 2013 Tres Lagunas Post Fire, 13

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  7. 2013 Tres Lagunas Post Fire, 3

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  8. 2013 Tres Lagunas Post Fire, 29

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  9. 2013 Tres Lagunas Post Fire, 5

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  10. 2013 Tres Lagunas Post Fire, 12

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  11. 2013 Tres Lagunas Post Fire, 35

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  12. 2013 Tres Lagunas Post Fire, 25

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  13. 2013 Tres Lagunas Post Fire, 28

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  14. 2013 Tres Lagunas Post Fire, 14

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  15. 2013 Tres Lagunas Post Fire, 18

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  16. 2013 Tres Lagunas Post Fire, 32

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  17. 2013 Tres Lagunas Post Fire, 16

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  18. 2013 Tres Lagunas Post Fire, 33

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  19. 2013 Tres Lagunas Post Fire, 19

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  20. 2013 Tres Lagunas Post Fire, 6

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  1. 2013 Tres Lagunas Post Fire, 26

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  2. 2013 Tres Lagunas Post Fire, 24

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  3. 2013 Tres Lagunas Post Fire, 30

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  4. 2013 Tres Lagunas Post Fire, 27

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  5. 2013 Tres Lagunas Post Fire, 9

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — USDA USFS Southwestern Region Contract # AG-8371-C-10-0011 Delivery # AG-8371-D-13-0056 DIGITAL PHOTOGRAPHY ACQUISITION, TRES LAGUNAS FIRE, NEW MEXICO Project...

  6. Procedure of generation of the ECP database for Laguna Verde; Procedimiento de generacion de base de datos ECP para Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Perusquia C, R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1992-09-15

    This procedure will be used by the personnel of the Discipline of Nuclear Analysis of the Reactor of CFE to execute PRESTO with the purpose of generating the base for the Estimate of the Position of critical bars during the start up (ECP Database). (Author)

  7. Synopsis of Laguna Atascosa wilderness record : Laguna Atascosa National Wildlife Refuge, Texas

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a synopsis of information regarding the wilderness status of Laguna Atascosa National Wildlife Refuge. Information covered includes a description of...

  8. Migration chronology and distribution of redheads on the lower Laguna Madre, Texas

    Science.gov (United States)

    Custer, Christine M.; Custer, T.W.; Zwank, P.J.

    1997-01-01

    An estimated 80% of redheads (Aythya americana) winter on the Laguna Madre of southern Texas and Mexico. Because there have been profound changes in the Laguna Madre over the past three decades and the area is facing increasing industrial and recreational development, we studied the winter distribution and habitat requirements of redheads during two winters (1987-1988 and 1988-1989) on the Lower Laguna Madre, Texas to provide information that could be used to understand, identify, and protect wintering redhead habitat. Redheads began arriving on the Lower Laguna Madre during early October in 1987 and 1988, and continued to arrive through November. Redhead migration was closely associated with passing weather fronts. Redheads arrived on the day a front arrived and during the following two days; no migrants were observed arriving the day before a weather front arrived. Flock size of arriving redheads was 26.4 ± 0.6 birds and did not differ among days or by time of day (morning midday, or afternoon). Number of flocks arriving per 0.5 h interval (arrival rate) was greater during afternoon (21.7 ± 0.6) than during morning (4.3 ± 1.2) or midday (1.5 ± 0.4) on the day of frontal passage and during the first day after frontal passage. Upon arrival, redhead flocks congregated in the central portion of the Lower Laguna Madre. They continued to use the central portion throughout the winter, but gradually spread to the northern and southern ends of the lagoon. Seventy-one percent of the area used by flocks was vegetated with shoalgrass (Halodule wrightii) although shoalgrass covered only 32% of the lagoon. Flock movements seemed to be related to tide level; redheads moved to remain in water 12-30 cm deep. These data can be used by the environmental community to identify and protect this unique and indispensable habitat for wintering redheads.

  9. Experimental study of ghost fishing by gillnets in Laguna Verde Valparaíso, Chile

    Directory of Open Access Journals (Sweden)

    Dante Queirolo

    2014-11-01

    Full Text Available In 2010, two experiments were carried out in order to study ghost fishing generated by lost or abandoned gillnets. The first experiment was aimed to identify and quantify the number of captured specimens in intentionally abandoned gillnet between 45 and 86 m depth, which were periodically checked up to 156 days after being abandoned. In this experiment, 912 specimens of 12 taxa were caught, mostly invertebrates such as Cancer porteri (81.6% and Platymera gaudichaudii (9%. After the abandonment, the fish caught were only registered until day 63, while benthic species were captured during all the experiment. The second experiment consisted of checking and registering periodically the loss of height of an abandoned gillnet at 34 m depth in order to determine the reduction of the fishing capacity of the net. After 19 days of abandonment, the functional area of the net was reduced to 40% of the original area, reaching nearly zero after 155 days of abandonment. In order to estimate the potential effect of lost or abandoned gillnets in Chilean hake fisheries (Merluccius gayi gayi, an additional information-collecting process must be carried out, mainly in terms of frequency of gillnets losses.

  10. Huertos urbanos: el verde ciudadano

    OpenAIRE

    Espinosa Seguí, Ana

    2013-01-01

    Los huertos urbanos reutilizan fragmentos de ciudad degradados y se los ofrecen a los ciudadanos, embelleciendo la ciudad y dándole una función social y ecológica al territorio. Han estado tradicionalmente relacionados con períodos de crisis urbana, ecológica y económica. Es necesaria una revisión de la evolución de estos espacios verdes en la ciudad.

  11. Living With Parasites in Palo Verde National Park

    Directory of Open Access Journals (Sweden)

    Eben Kirksey

    2012-11-01

    Full Text Available Bruno Latour has tried to bring a parliamentary democracy to the domain of nature. Wading through the swamps of Palo Verde, a national park in the Guanacaste Province of Costa Rica, and wandering onto neighbouring agricultural lands, I failed to find a central place where people were speaking for nature. Departing from a failed attempt to speak for another species (the fringe-toed foam frog, this paper considers how diverging values and obligations shape relationships in multi-species worlds. As spokespersons articulated competing visions of nature on the borderlands of Palo Verde, multiple social and ecological worlds went to war. The haunting specter of capital joined the fray—animating the movements of cattle, grasses with animal rhizomes, rice seeds, and flighty ducks across national borders and through fragmented landscapes. Amidst this warfare, the fringe-toed foam frog was just one tenacious parasite, a noisy agent eating at the table of another, which began to flourish in worlds designed with the well-being of others in mind. Cattails, charismatic birds, and a multitude of insects began interrupting human dreams and schemes. Final solutions to the problem of living with parasites failed in Palo Verde. Humans and parasites, who became para-selves of one another, maintained an abiding presence in the landscape.

  12. Santa Fe Indian Camp, House 21, Richmond, California: Persistence of Identity among Laguna Pueblo Railroad Laborers, 1945-1982.

    Science.gov (United States)

    Peters, Kurt

    1995-01-01

    In 1880 the Laguna people and the predecessor of the Atchison, Topeka, and Santa Fe Railroad reached an agreement giving the railroad unhindered right-of-way through Laguna lands in exchange for Laguna employment "forever." Discusses the Laguna-railroad relationship through 1982, Laguna labor camps in California, and the persistence of…

  13. Burrowing Owl - Palo Verde Valley [ds197

    Data.gov (United States)

    California Department of Resources — These burrowing owl observations were collected during the spring and early summer of 1976 in the Palo Verde Valley, eastern Riverside County, California. This is an...

  14. Laguna Cartagena National Wildlife Refuge [Land Status Map

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This map was produced by the Division of Realty to depict landownership at Laguna Cartagena National Wildlife Refuge. It was generated from rectified aerial...

  15. Wilderness synopsis: Laguna Atascosa National Wildlife Refuge : Wilderness study

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a synopsis of the wilderness study of the Laguna Atascosa National Wildlife Refuge. Topics covered include a description of the refuge, current...

  16. The Trail Inventory of Laguna Atascosa NWR [Cycle 2

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of this report is to create a baseline inventory of all non-motorized trails on Laguna Atascosa National Wildlife Refuge. Trails in this inventory are...

  17. Laguna Atascosa Wilderness study area : Wilderness study report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is an in-depth report containing the results of a wilderness study done of the Laguna Atascosa National Wildlife Refuge. It covers the objectives of...

  18. Letter to President [Laguna Atascosa National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a letter from the Secretary of the Interior to the President regarding the establishment of the Laguna Atascosa Wilderness area. The letter...

  19. No wilderness designation announcement [Laguna Atascosa National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a brief announcement stating that wilderness designation will not be recommended for any portion of the Laguna Atascosa National Wildlife Refuge....

  20. Laguna Atascosa National Wildlife Refuge [Land Status Map

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This map was produced by the Division of Realty to depict landownership at Laguna Atascosa National Wildlife Refuge. It was generated from rectified aerial...

  1. Statement of Bureau representative [template] [Laguna Atascosa National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a template used for the statement of the bureau representative and the public hearing for the Laguna Atascosa National Wildlife Refuge Wilderness...

  2. Laguna Atascosa National Wildlife Refuge: Comprehensive Conservation Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Comprehensive Conservation Plan (CCP) was written to guide management on Laguna Atascosa NWR for the next 15 years. This plan outlines the Refuge vision and...

  3. Slide presentation at wilderness public hearing : Laguna Atascosa

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a layout for the presentation to be given at the public hearing for the Laguna Atascosa National Wildlife Refuge. It details the slides that will be...

  4. Future perspectives in neutrino physics: The Laguna-LBNO case

    CERN Document Server

    Buizza Avanzini, M

    2013-01-01

    LAGUNA-LBNO is a Design Study funded by the European Commission to develop the de- sign of a deep underground neutrino observatory; its physics program involves the study of neutrino oscillations at long baselines, the investigation of the Grand Unication of elemen- tary forces and the detection of neutrinos from known and unknown astrophysical sources. Building on the successful format and on the ndings of the previous LAGUNA Design Study, LAGUNA-LBNO is more focused and is specically considering Long Baseline Neutrino Oscil- lations (LBNO) with neutrino beams from CERN. Two sites, Frejus (in France at 130 km) and Pyhasalmi (in Finland at 2300 km), are being considered. Three dierent detector technolo- gies are being studied: Water Cherenkov, Liquid Scintillator and Liquid Argon. Recently the LAGUNA-LBNO consortium has submitted an Expression of Interest for a very long baseline neutrino experiment, selecting as a rst priority the option of a Liquid Argon detector at Pyhasalmi.

  5. Laguna Cartagena National Wildlife Refuge: Comprehensive Conservation Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Comprehensive Conservation Plan (CCP) was written to guide management on Laguna Cartagena NWR for the next 15 years. This plan outlines the Refuge vision and...

  6. A volcanological and geochemical investigation of Boa Vistta, Cape Verde Islands

    DEFF Research Database (Denmark)

    Dyhr, Charlotte Thorup; Holm, Paul Martin

    2009-01-01

    Boa Vista, the easternmost island in the Cape Verde archipelago, consists of volcanic products, minor intrusions and a thin partial sedimentary cover. The first 15 age results from 40Ar/39Ar incremental heating analysis of groundmass separates from volcanic and plutonic rocks from Boa Vista...... lavas. The second stage, consisting of evolved lavas of phonolitic-trachytic compositions and nepheline syenites, makes up large central parts of the island. The large volume of evolved rocks and the extended eruption period of several Ma make stage 2 in Boa Vista unique to Cape Verde. Mainly basanites...... and with activity partly overlapping in time. The volcanic evolution of Boa Vista constrains the initiation of volcanic activity in the Cape Verde archipelago to the eastern islands. Major and trace element geochemistry of 160 volcanic and plutonic rocks representing the entire exposed chronological sequence on Boa...

  7. Escuela Superior de Palos Verdes

    Directory of Open Access Journals (Sweden)

    Neutra, Richard J.

    1965-02-01

    Full Text Available Before initiating the building operations for the «Palos Verdes» School, the site was divided into two large horizontal surfaces, at different levels. The lower one served to accommodate the playing fields, a car park, the physical training building, and shop and ancillary buildings. On the higher of these two surfaces, and to the West of the access road, there is a car park and also the building and plot of ground devoted to agricultural technology, as well as the literary studies and general purpose buildings. As a complement to these, there is a series of blocks, arranged in parallel rows, which house the administrative offices, the art school, the craft's school, the general classrooms, and those devoted to higher education. The fascinating aspect of this school is the outstanding penetration of the architect's mind into the essential function of the project. Its most evident merit is the sense of comradeship and harmony that permeates the whole architectural manifold.Antes de construir el complejo escolar «Palos Verdes» se comenzó por crear, en el terreno, dos grandes mesetas a niveles diferentes. Sobre el inferior se organizaron: los campos de juegos, de deportes, un aparcamiento, el edificio para educación física y los destinados a tiendas y servicios. Sobre la meseta superior, al oeste de la vía de acceso, se dispuso un aparcamiento y el edificio y campo para adiestramiento agrícola; al este, otro aparcamiento, el edificio dedicado a materias literarias, y el destinado a usos múltiples. Completan las instalaciones de la escuela una serie de bloques paralelos: la administración, la escuela de arte, las clases de trabajos manuales, las aulas de enseñanzas generales, y las de los cursos superiores. Lo fascinante de este complejo escolar es la perfecta y magistral compenetración del arquitecto con el tema proyectado, y su mayor mérito, la sensación de cordialidad y armonía con el ambiente.

  8. Talento verde y cadenas de suministro verdes: ¿existe una relación significativa?

    Directory of Open Access Journals (Sweden)

    María del Carmen Torres-Salazar

    2016-01-01

    Full Text Available Introducción: En este texto se presentan resultados estadísticos de la relación entre directivos con características de talento verde y la implementación de prácticas de cadena de suministro verde. Debido a que existen investigaciones sobre la importancia de la visión de la alta dirección para la adopción de prácticas verdes; y sin embargo ninguna da cuenta de las características personales del directivo, ni tampoco de la relación significativa entre estas características y la puesta en marcha de prácticas de cadena de suministro verde, esta es la aportación de la presente investigación. El trabajo se desarrolló en empresas manufactureras con más de diez trabajadores de la zona oriente del estado de Morelos México. La caracterización del término talento verde se reportó en el artículo, Talento verde: caracterización y búsqueda, publicado en el número 14 de esta revista. Método: El método utilizado consistió en la construcción de una encuesta dividida en tres categorías que posteriormente se convirtieron en variables: prácticas de cadena de suministro verde, presiones institucionales y talento verde. Las dos primeras se adaptaron de la encuesta de Zhu y Sarkis (2007 y la tercera surgió de la representación social de talento verde, producto de una fase de esta investigación. La encuesta se validó con un grupo de empresarios miembros de la Cámara Nacional de la Industria de la Transformación (CANACINTRA capítulo Morelos. El instrumento validado se aplicó a 26 directivos de empresas manufactureras con más de diez trabajadores de la zona oriente de Morelos, con el fin de probar la relación entre directivos con características de talento verde y la puesta en marcha de prácticas de cadena de suministro verde. Para ello se utilizaron como herramientas estadísticas la correlación de Pearson y la regresión lineal múltiple. Resultados: Las prácticas de cadena de suministro verde de las empresas

  9. Impuestos ambientales y Reforma Fiscal Verde

    OpenAIRE

    Casado Conde, Ander

    2016-01-01

    [ES] Este trabajo tiene como objetivo explicar el concepto de impuesto ambiental y analizar la situación de la fiscalidad ambiental tanto en los países de la OCDE como en España. Además, también se explican los conceptos de reforma fiscal verde y Doble Dividendo y se ofrece un resumen de las diferentes reformas fiscales verdes llevadas a cabo en varios países a lo largo de las ultimas décadas.

  10. Origin and Population Dynamics of a Novel HIV-1 Subtype G Clade Circulating in Cape Verde and Portugal.

    Science.gov (United States)

    de Pina-Araujo, Isabel Inês M; Delatorre, Edson; Guimarães, Monick L; Morgado, Mariza G; Bello, Gonzalo

    2015-01-01

    The human immunodeficiency virus type 1 (HIV-1) subtype G is the most prevalent and second most prevalent HIV-1 clade in Cape Verde and Portugal, respectively; but there is no information about the origin and spatiotemporal dispersal pattern of this HIV-1 clade circulating in those countries. To this end, we used Maximum Likelihood and Bayesian coalescent-based methods to analyze a collection of 578 HIV-1 subtype G pol sequences sampled throughout Portugal, Cape Verde and 11 other countries from West and Central Africa over a period of 22 years (1992 to 2013). Our analyses indicate that most subtype G sequences from Cape Verde (80%) and Portugal (95%) branched together in a distinct monophyletic cluster (here called G(CV-PT)). The G(CV-PT) clade probably emerged after a single migration of the virus out of Central Africa into Cape Verde between the late 1970s and the middle 1980s, followed by a rapid dissemination to Portugal a couple of years later. Reconstruction of the demographic history of the G(CV-PT) clade circulating in Cape Verde and Portugal indicates that this viral clade displayed an initial phase of exponential growth during the 1980s and 1990s, followed by a decline in growth rate since the early 2000s. Our data also indicate that during the exponential growth phase the G(CV-PT) clade recombined with a preexisting subtype B viral strain circulating in Portugal, originating the CRF14_BG clade that was later disseminated to Spain and Cape Verde. Historical and recent human population movements between Angola, Cape Verde and Portugal probably played a key role in the origin and dispersal of the G(CV-PT )and CRF14_BG clades.

  11. El Lago Chasicó: analogías y diferencias con las lagunas pampásicas.

    Directory of Open Access Journals (Sweden)

    Alejandra Vanina Volpedo

    2013-10-01

    Full Text Available La llanura pampeana es una de las grandes planicies a nivel mundial. La escasa pendiente y la geomorfología hacen que el escurrimiento de las aguas de  lluvia, sea relativamente lento y presente numerosos sistemas lénticos, que poseen diferentes orígenes geomorfológicos y características limnológicas. En este trabajo se comparan las características más relevantes de los sistemas lénticos más comunes presentes en la zona (lagunas pampásicas y se  analizan las analogías y diferencias de dichos cuerpos de agua con  un lago del sudoeste bonaerense (Lago Chasicó.  Las lagunas pampásicas poseen un perfil de “palangana”, no poseen un ciclo térmico definido, ni estratificación persistente,  poseen circulación continua, y no presentan una diferenciación entre la zona litoral y la central de la laguna. Otra de las características típicas de estos cuerpos de agua es la presencia de macrófitas. El Lago Chasicó posee un origen geomorfológico combinado tectónico-eólico, perfil en forma de “U” y una profundidad importante, significativamente mayor a la profundidad media de las lagunas pampásicas. Esta característica permite sugerir la posibilidad de la existencia de un gradiente térmico. Además no posee macrofitas en su costa. Las aguas del lago son  clorurada sódicas, poseen alta salinidad (>25 gL-1, mientras que las aguas de las lagunas pampásicas son bicarbonatadas sódicas o cloruradas sódicas bicarbonatadas, sin anión dominante, con una salinidad menor a 3 g L-1. El Lago Chasicó y las lagunas pampásicas son hipertróficos.

  12. Variaciones y características en los cambios de nivel de la laguna cratérica del Volcan Irazú (1965-2012, Costa Rica

    Directory of Open Access Journals (Sweden)

    Ronald Ramírez

    2013-06-01

    Full Text Available La laguna cratérica del Irazú ha presentado cambios notorios en su coloración, temperatura, grado de acidez y profundidad desde 1965 hasta 2012. El nivel ha variado desde los 31 m en 1995 y 2001 hasta quedarse totalmente seca como sucedió principalmente en 1977, 1979, 1982-83, 1987 y 1990. Estos niveles no siempre se encuentran relacionados en forma directa con el grado de precipitación pluvial. En ciertos momentos, al parecer, en el fondo impermeabilizado de la laguna, se forman grietas que permiten drenar relativamente rápido, dejando el fondo visible por varios meses o años, para que tiempo después se vuelva a formar debido a una nueva selladura de las mismas. La variación del color (verde, turquesa azulado a amarillo, más raramente blanquecino y rojizo en las periferias, temperatura (16º-35ºC, pH (2,85-5,85 parece estar relacionada con la profundidad, actividad de fumarolas subacuáticas, actividad de algas y a la formación de sedimentos ferruginosos producto de los constantes deslizamientos de las paredes.

  13. Water-quality reconnaissance of Laguna Tortuguero, Vega Baja, Puerto Rico, March 1999-May 2000

    Science.gov (United States)

    Soler-Lopez, Luis; Guzman-Rios, Senen; Conde-Costas, Carlos

    2006-01-01

    The Laguna Tortuguero, a slightly saline to freshwater lagoon in north-central Puerto Rico, has a surface area of about 220 hectares and a mean depth of about 1.2 meters. As part of a water-quality reconnaissance, water samples were collected at about monthly and near bi-monthly intervals from March 1999 to May 2000 at four sites: three stations inside the lagoon and one station at the artificial outlet channel dredged in 1940, which connects the lagoon with the Atlantic Ocean. Physical characteristics that were determined from these water samples were pH, temperature, specific conductance, dissolved oxygen, dissolved oxygen saturation, and discharge at the outlet canal. Other water-quality constituents also were determined, including nitrogen and phosphorus species, organic carbon, chlorophyll a and b, plankton biomass, hardness, alkalinity as calcium carbonate, and major ions. Additionally, a diel study was conducted at three stations in the lagoon to obtain data on the diurnal variation of temperature, specific conductance, dissolved oxygen, and dissolved oxygen saturation. The data analysis indicates the water quality of Laguna Tortuguero complies with the Puerto Rico Environmental Quality Board standards and regulations.

  14. Origin and evolution of the Laguna Potrok Aike maar (Patagonia, Argentina)

    Science.gov (United States)

    Gebhardt, A. C.; de Batist, M.; Niessen, F.; Anselmetti, F. S.; Ariztegui, D.; Ohlendorf, C.; Zolitschka, B.

    2009-04-01

    Laguna Potrok Aike, a maar lake in southern-most Patagonia, is located at about 110 m a.s.l. in the Pliocene to late Quaternary Pali Aike Volcanic Field (Santa Cruz, southern Patagonia, Argentina) at about 52°S and 70°W, some 20 km north of the Strait of Magellan and approximately 90 km west of the city of Rio Gallegos. The lake is almost circular and bowl-shaped with a 100 m deep, flat plain in its central part and an approximate diameter of 3.5 km. Steep slopes separate the central plain from the lake shoulder at about 35 m water depth. At present, strong winds permanently mix the entire water column. The closed lake basin contains a sub saline water body and has only episodic inflows with the most important episodic tributary situated on the western shore. Discharge is restricted to major snowmelt events. Laguna Potrok Aike is presently located at the boundary between the Southern Hemispheric Westerlies and the Antarctic Polar Front. The sedimentary regime is thus influenced by climatic and hydrologic conditions related to the Antarctic Circumpolar Current, the Southern Hemispheric Westerlies and sporadic outbreaks of Antarctic polar air masses. Previous studies demonstrated that closed lakes in southern South America are sensitive to variations in the evaporation/precipitation ratio and have experienced drastic lake level changes in the past causing for example the desiccation of the 75 m deep Lago Cardiel during the Late Glacial. Multiproxy environmental reconstruction of the last 16 ka documents that Laguna Potrok Aike is highly sensitive to climate change. Based on an Ar/Ar age determination, the phreatomagmatic tephra that is assumed to relate to the Potrok Aike maar eruption was formed around 770 ka. Thus Laguna Potrok Aike sediments contain almost 0.8 million years of climate history spanning several past glacial-interglacial cycles making it a unique archive for non-tropical and non-polar regions of the Southern Hemisphere. In particular, variations of

  15. En torno a La casa verde

    Directory of Open Access Journals (Sweden)

    Francisco Eladio Gómez Mejía

    1966-06-01

    Full Text Available A los treinta años, el escritor peruano Mario Vargas Llosa acaba de publicar su segunda novela maestra. Me refiero a La casa verde. Antes habían aparecido La huída (1952, pieza de teatro, el libro de cuentos Los jefes (1958 y su primera novela La ciudad y los perros (1962 . Treinta años que han bastado para colocarlo al frente de la novelística latinoamericana de vanguardia.

  16. QUÍMICA VERDE: UN NUEVO RETO

    Directory of Open Access Journals (Sweden)

    Nerlis Paola Pájaro Castro

    2011-01-01

    Full Text Available En la actualidad, existe un enorme deterioro del medio ambiente que ha generado la necesidad de buscar alternativas que conduzcan a la sostenibilidad ambiental. Una de estas herramientas es la ¿química verde¿, concepto que contempla el diseño de productos y procesos que reduzcan la generación de sustancias peligrosas y maximicen la eficiencia en la utilización de recursos materiales y energéticos. El empleo de tecnologías menos contaminantes, permitirá a las empresas químicas mitigar los efectos ambientales asociados a su actividad, reduciendo el consumo de materiales e incrementando la participación de recursos renovables. Para alcanzar estas metas, se han propuesto 12 principios básicos de química verde, aplicables en diferentes campos, tales como la medicina, la agricultura, la industria química y farmacéutica. Esta revisión detalla los principios y usos principales de la química verde, y su aplicación como una filosofía de trabajo para avanzar hacia un verdadero desarrollo sostenible.

  17. Patagonian and Antarctic dust as recorded in the sediments of Laguna Potrok Aike (Patagonia, Argentina)

    Science.gov (United States)

    Haberzettl, Torsten; Stopp, Annemarie; Lisé-Pronovost, Agathe; Gebhardt, Catalina; Ohlendorf, Christian; Zolitschka, Bernd; von Eynatten, Hilmar; Kleinhanns, Ilka; Pasado Science Team

    2010-05-01

    as additional time control for the recently recovered sediment record within the ICDP deep drilling project PASADO. To support this idea, we performed Sr/Nd-isotopic analyses on the assumed aeolian, well sorted fraction (63-200 µm) deposited in Laguna Potrok Aike during the last glaciation as well as on the Bigler, S. Sommer, J. Jouzel, Dust and sea salt variability in central East Antarctica (Dome C) over the last 45 kyrs and its implications for southern high-latitude climate, Geophysical Research Letters 29 (2002) doi:10.1029/2002GL015186. [2] B. Delmonte, I. Basile-Doelsch, J.R. Petit, V. Maggi, M. Revel-Rolland, A. Michard, E. Jagoutz, F. Grousset, Comparing the Epica and Vostok dust records during the last 220,000 years: stratigraphical correlation and provenance in glacial periods, Earth-Science Reviews 66 (2004) 63-87.

  18. Port Isabel (GIWW) Channel Improvements at the Queen Isabella Causeway. Laguna Madre, Texas, Navigation Improvement Project

    Science.gov (United States)

    2009-09-01

    ER D C/ CH L TR -0 9 -1 3 Port Isabel (GIWW) Channel Improvements at the Queen Isabella Causeway Laguna Madre , Texas, Navigation...Causeway Laguna Madre , Texas, Navigation Improvement Project Timothy W. Shelton, P.E. and Dennis Webb, P.E. Coastal and Hydraulics Laboratory U.S...distribution is unlimited. Prepared for U.S. Army Corps of Engineer District, Galveston Galveston, TX 77550 ERDC/CHL TR-09-13 ii Abstract: Laguna Madre is

  19. Laguna Las Tres Pascualas, Concepción

    Directory of Open Access Journals (Sweden)

    Roberto Lira Olmo

    2015-04-01

    Full Text Available La ciudad de Concepción constituye un área urbana privilegiada en relación a su asentamiento físico, ya que posee, entre otros, un paisaje natural de pocas ciudades en el mundo con sus lagunas y humedales. Entre ellas, destaca la laguna Las Tres Pascualas, la más conocida, y de mayor tamaño con una superficie de 5,3 hectáreas, emplazada en pleno casco urbano en la remozada Avenida Paicaví y próxima al nodo de Avenida Los Carrera.

  20. Recuperación urbana Laguna Las Tres Pascualas

    Directory of Open Access Journals (Sweden)

    Carolina Araya

    2015-04-01

    Full Text Available La laguna Las Tres Pascualas como hito urbano se constituye como la laguna de mayor tamaño, con una superficie de 5,3 has. y una profundidad de 5,09m, emplazada dentro del casco urbano de la ciudad. Sin embargo, a pesar de su privilegiada ubicación, se vio afectada por una paulatina y espontánea ocupación de las zonas aledañas promoviendo la consolidación de núcleos poblacionales irregulares, caracterizados por un estado permanente de marginalidad social y, lo que contribuyó a que este sistema presentara elevados índices de contaminación.

  1. 36 CFR 7.39 - Mesa Verde National Park.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 1 2010-07-01 2010-07-01 false Mesa Verde National Park. 7.39 Section 7.39 Parks, Forests, and Public Property NATIONAL PARK SERVICE, DEPARTMENT OF THE INTERIOR SPECIAL REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.39 Mesa Verde National Park. (a) Visiting...

  2. Dengue in Cape Verde: vector control and vaccination

    CERN Document Server

    Rodrigues, Helena Sofia; Torres, Delfim F M

    2012-01-01

    In 2009, for the first time in Cape Verde, an outbreak of dengue was reported and over twenty thousand people were infected. Only a few prophylactic measures were taken. The effects of vector control on disease spreading, such as insecticide (larvicide and adulticide) and mechanical control, as well as an hypothetical vaccine, are estimated through simulations with the Cape Verde data.

  3. MEZCLA DEL MARKETING VERDE: UNA PERSPECTIVA TEÓRICA

    Directory of Open Access Journals (Sweden)

    Thel Augusto Monteiro

    2015-01-01

    Full Text Available Este artículo aborda una perspectiva teórica al respecto de la mezcla de marketing y su aplicabilidad en las prácticas del marketing verde. Se trata de un estudio cualitativo, de carácter exploratorio, desarrollado a través del análisis de datos secundarios sobre el tema, utilizado como forma de unir la práctica y la teoría presentada por los autores analizados en el período comprendido entre 2003 y 2012. Se ofrece una breve síntesis sobre los conceptos de marketing verde, sus características, acciones y la presentación de la mezcla de marketing adaptada al marketing verde. Se destaca la contribución de este artículo sobre el marketing verde y el avance de este tema, proponiendo una mezcla de marketing adaptada al marketing verde.

  4. La Tercera Revolución Verde

    OpenAIRE

    García Olmedo, Francisco

    1999-01-01

    La tercera revolución verde está en sus inicios y se basa en la aplicación de la ingeniería genética a la mejora de las plantas cultivadas. Su fundamento científico es la genética molecular, que se desarrolló a partir del descubrimiento de la estructura del ADN por Watson y Crick en 1952. Se traza un panorama completo de la evolución y mejora de las plantas cultivadas desde el neolítico hasta hoy, y se sitúa esta revolución en un contexto general.

  5. Manejo de las areas verdes urbanas

    OpenAIRE

    Mark Sorensen; Valerie Barzetti; Kari Keipi; Williams, John R.

    1998-01-01

    El presente documento (ENV-109) busca dar al lector una base sólida sobre los beneficios, retos y enfoque para el desarrollo de programas sostenibles de manejo de áreas verdes urbanas. El objetivo es abarcar los elementos más importantes que deben ser considerados a la hora de iniciar los proyectos. Se incluye una variedad de estudios de casos de toda América Latina y de algunos países de otras regiones del mundo para ilustrar problemas reales y sus soluciones. Los casos e ideas presentados e...

  6. Effects of a cattail marsh on sediment and water quality of the Laguna Atascosa National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The drainage known as the Cayo Atascosa transports irrigation return flow water through a cattail marsh and into Laguna Atascosa (Lake) located in Laguna Atascosa...

  7. Frequency modulator. Transmission of meteorological signals in LVC; Modulador de frecuencia. Transmision de senales meteorologicas en CLV

    Energy Technology Data Exchange (ETDEWEB)

    Rivero G, P.T.; Ramirez S, R.; Gonzalez M, J.L.; Rojas N, P.; Celis del Angel, L. [ININ, 52750 La marquesa, Estado de Mexico (Mexico)

    2007-07-01

    The development of the frequency modulator and demodulator circuit for transmission of meteorological signals by means of fiber optics of the meteorology station to the nuclear reactor unit 1 in the Laguna Verde Central in Veracruz is described. (Author)

  8. Quaternary pollen record from laguna de tagua tagua, chile.

    Science.gov (United States)

    Heusser, C J

    1983-03-25

    Pollen of southern beech and podocarp at Laguna de Tagua Tagua during the late Pleistocene indicates that cooler and more humid intervals were a feature of Ice Age climate at this subtropical latitude in Chile. The influence of the southern westerlies may have been greater at this time, and the effect of the Pacific anticyclone was apparently weakened. The climate today, wet in winter and dry in summer, supports broad sclerophyll vegetation that developed during the Holocene with the arrival of paleo-Indians and the extinction of mastodon and horse.

  9. Water Institutions and Management in Cape Verde

    Directory of Open Access Journals (Sweden)

    Miguel Suarez Bosa

    2015-05-01

    Full Text Available The water-management model used in Cape Verde for irrigation water is a singular one involving both public and private institutions. The institutional framework adopted since independence (1975 includes influences of both Portuguese colonial occupation and African culture. Water is a common-pool resource, which can take the form of communal, private or state property, or not be subject to any form of ownership. Thus, this case study enables us to compare theories about managing. From a neo-liberal point of view, the common administration of resources of this kind is inefficient, but for one school of the institutional theory, solutions can come “from within”; in other words, from user groups themselves, who can co-operate, once they have defined commitments. Research based on surveys and interviews with private sector administrators leads to the conclusion that user association management is successful, whereas, individual management can lead to squandering.

  10. A novadora dramaturgia Barriga-Verde

    OpenAIRE

    Jairo Cesar Maciel

    2010-01-01

    Depois de três décadas convivendo com o teatro de Santa Catarina, podemos dizer que o meu hedonismo em discutir o que se escreve para o teatro em terras barriga-verdes, encontra-se cada vez mais incitado; motivado por uma célere gama de emergentes escritores dramáticos que surgiram ao longo desse período e que merecem aqui as nossas mais altas considerações e uma análise mais acurada desses textos como gênero e traços estilísticos. Para que pudéssemos analisar A Novadora Dramaturgia Barriga-V...

  11. Phylogeography of Cape Verde Island skinks (Mabuya).

    Science.gov (United States)

    Brown, R P; Suarez, N M; Smith, A; Pestano, J

    2001-06-01

    The Cape Verde Islands are of volcanic origin with most having appeared between the early Miocene and mid-Pleistocene. They contain six known species of Mabuya skinks. Phylogeographical relationships within and among the relatively widespread taxa M. stangeri, M. spinalis and M. delalandii were inferred, based on approximately 1 kbp of the cytochrome b gene (mitochondrial DNA). Reciprocal monophyly of M. spinalis and M. stangeri was established, which may have arisen from an early Pliocene/late Miocene cladogenetic event. Considerable between-island sequence divergence was detected among M. spinalis, which appears to have colonized the older islands (Sal and Boavista) first. Much lower sequence divergence was found in M. delalandii, indicating a more recent range expansion. Here, evidence points to colonization of the younger islands of Brava and Fogo soon after appearance. There are similarities between some of the described patterns and those seen in lizards from the Canary Islands.

  12. Impuestos verdes: una meta de equidad

    Directory of Open Access Journals (Sweden)

    Lilliana Arrieta Quesada

    2011-09-01

    Full Text Available Al considerar necesario incorporar a los grupos económicos en el gran proyecto de alcanzar metas de desarrollo sostenible, que surge como un nuevo paradigma al tomarse en consciencia por parte de los organismos internacionales, entre ellos las Naciones Unidas, de la necesidad de hacer un planteamiento de desarrollo económico diferente al convencional que considera aspectos ambientales y de equidad social, se admite por primera vez que la explotación de los recursos naturales y su transformación en materia prima y fuente energética, tiene límites, los cuales deben ser considerados en cualquier planteamiento serio de desarrollo económico.Es así como surge la tesis de los impuestos verdes como una opción que permita a los gobiernos incidir tanto en el mercado como en el sector industrial y en los hábitos de los consumidores.

  13. Mercadeo verde de una empresa dorada

    Directory of Open Access Journals (Sweden)

    Carlos Mario Uribe-Saldarriaga

    2014-01-01

    Full Text Available El caso presenta la campa ̃ na de mercadeo realizada por Ecopetrol entre 2009 y 2012 para la introducción en Colombia del diésel ultra bajo de azufre denominado diésel limpio. Se examina la campa ̃ na desde 2 puntos de vista: el primero, el posicionamiento de Ecopetrol como una de las empresas más admiradas de Colombia, tanto por sus resultados financieros como por sus actividades en la responsabilidad social empresarial; el segundo, desde las exigencias que se hacen al mercadeo ambiental en los países desarro- llados, especialmente con respecto al lavado verde, teniendo en cuenta a la vez que Ecopetrol opera en un país en vía de desarrollo donde existe un menor avance en las exigencias ambientales hechas por los grupos de interés.

  14. Estudo prospectivo, duplo cego e cruzado da Camellia sinensis (chá verde) nas dislipidemias

    OpenAIRE

    Batista,Gesiani de Almeida Pierin; Cunha,Cláudio L. Pereira da; Scartezini, Mariléia; von der Heyde,Raul; Murílo G Bitencourt; Melo,Sandra Fabrício de

    2009-01-01

    FUNDAMENTO: Estudos epidemiológicos estabeleceram uma associação entre dislipidemias e aterosclerose. A terapia nutricional é um ponto central da estratégia preventiva em indivíduos que apresentam fatores de risco para doença aterosclerótica. OBJETIVOS: Investigar os efeitos do chá verde (Camellia sinensis) em pacientes portadores de dislipidemias. MÉTODOS: O estudo envolveu 33 pacientes, com idade entre 21 e 71 anos, que consumiam uma dieta com baixo teor de gorduras (25% a 35% das calorias ...

  15. A Educação Musical em Cabo Verde

    Directory of Open Access Journals (Sweden)

    Alcides J. D. Lopes

    2012-09-01

    Full Text Available O presente artigo pretende abordar o tema A Educação Musical em Cabo Verde partindo de uma análise dos dados publicados e de entrevistas realizadas com personalidades relevantes ao tema.

  16. RRS "Charles Darwin" Cruise CD168, 02 Feb - 16 Feb 2005. Submarine landslides around the Cape Verde Islands

    OpenAIRE

    Masson, D. G.

    2005-01-01

    Catastrophic large-scale landslides are a fundamental process in the formation of many oceanic islands. The main aim of cruise CD168 was to carry out a reconnaissance survey of the influence of landsliding on the Cape Verde islands, in the eastern central Atlantic, and to compare this with the known effects of landsliding on the Canary Islands. The data collected during RRS Charles Darwin Cruise, when combined with synthetic aperture radar imagery of the subaerial islands, show clear evidence...

  17. High-$\\gamma$ Beta Beams within the LAGUNA design study

    CERN Document Server

    Orme, Christopher

    2010-01-01

    Within the LAGUNA design study, seven candidate sites are being assessed for their feasibility to host a next-generation, very large neutrino observatory. Such a detector will be expected to feature within a future European accelerator neutrino programme (Superbeam or Beta Beam), and hence the distance from CERN is of critical importance. In this article, the focus is a $^{18}$Ne and $^{6}$He Beta Beam sourced at CERN and directed towards a 50 kton Liquid Argon detector located at the LAGUNA sites: Slanic (L=1570 km) and Pyh\\"{a}salmi (L=2300 km). To improve sensitivity to the neutrino mass ordering, these baselines are then combined with a concurrent run with the same flux directed towards a large Water \\v{C}erenkov detector located at Canfranc (L=650 km). This degeneracy breaking combination is shown to provide comparable physics reach to the conservative Magic Baseline Beta Beam proposals. For $^{18}$Ne ions boosted to $\\gamma=570$ and $^{6}$He ions boosted to $\\gamma=350$, the correct mass ordering can be...

  18. EL IMAGINARIO "VERDE" Y EL VERDE URBANO COMO INSTRUMENTO DE CONSUMO INMOBILIARIO: CONFIGURANDO LAS CONDICIONES AMBIENTALES DEL ÁREA METROPOLITANA DE SANTIAGO

    Directory of Open Access Journals (Sweden)

    Felipe Irarrázaval Irarrázaval

    2012-01-01

    Full Text Available La mercantilización e instrumentalización de diversos elementos y procesos naturales ha condicionado perfectas plataformas para la acumulación de riquezas. Esto ha sido posible en la medida que existen las condiciones políticas, sociales y económicas para que suceda. Además, en el caso de las condiciones ambientales urbanas, se suma un "imaginario verde" en un amplio espectro de la población, la cual presenta un gran interés por vivir en espacios dotados de naturaleza. Estas condiciones han determinado que en las ciudades se desarrolle una desigual distribución de las condiciones ambientales, dado que cuando la gestión urbana queda en manos del sector privado, sólo las elites con poder adquisitivo pueden acceder a áreas verdes y al arbolado urbano. La presente investigación busca reconocer a la naturaleza urbana como un "instrumento de consumo" inmobiliario, así como sus implicancias en la distribución de las condiciones ambientales en Santiago de Chile. Para esto se reconoce el espacio urbano en ciudades capitalistas como un eslabón dentro de las plataformas de acumulación de capital. A su vez, se integra la perspectiva de los imaginarios ofertados/empleados por el sector inmobiliario como un tema central para concretar la plataforma de acumulación.

  19. Ouro Verde MG 2: nova cultivar de mungo-verde para Minas Gerais Ouro Verde MG 2: new mungbean cultivar for Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    Rogério F. Vieira

    2002-03-01

    Full Text Available Dentre várias linhagens introduzidas do "Asian Vegetable Research and Development Center" (AVRDC, sobressaiu a linhagem VC 3984-B-2-B-4-1-B, que recebeu o nome de Ouro Verde MG 2. Suas sementes são verde-brilhantes e o peso de 1000 unidades varia de 43 a 51 g. O início da floração ocorre em torno de 33 dias após a emergência e a primeira vagem madura surge entre 23 e 33 dias. Por se tratar de espécie de maturação desuniforme, podem ser necessárias duas a quatro colheitas. As plantas podem atingir 95 cm de altura. As vagens são marrom-escuras e concentram-se na parte superior da planta. É suscetível a duas doenças que geralmente aparecem no final do ciclo de vida do mungo-verde: míldio-pulverulento (Erysiphe polygoni e mancha-foliar-de-cercospora (Cercospora canescens. A 'Ouro Verde MG 2' é resistente ao acamamento, e o seu rendimento, em três ensaios instalados em dezembro, janeiro e fevereiro, variou de 1,5 a 2,0 t/ha. Esses rendimentos foram, em média, 12% superior ao da cultivar Ouro Verde.Among many accessions introduced from Asian Vegetable Research and Development Center (AVRDC, the VC 3984-B-2-B-4-1-B stood out and was named 'Ouro Verde MG 2'. The seeds are bright green and 1000-seed weight ranges from 43 to 51 g. Flowering starts approximately 33 days after emergence and the first pod ripens between 23 and 33 days later. As mungbean is a non-uniform maturation species, two to four harvests could be necessary. The plant can reach 95 cm high. The pods are dark brown and concentrated in the upper canopy. This cv. is susceptible to two diseases which generally appear late in the crop: powdery mildew (Erysiphe polygoni and cercospora leaf spot (Cercospora canescens. 'Ouro Verde MG 2' is resistant to lodging. The yield measured in three experiments carried out in December, January, and February, ranged from 1.5 to 2.0 t/ha. In average, these yields were 12% superior than the achieved by the cultivar 'Ouro Verde'.

  20. El anillo verde de Vitoria-Gasteiz

    Directory of Open Access Journals (Sweden)

    Marañón, Blanca

    2001-10-01

    de la periferia de la ciudad, donde coexistían zonas de alto valor ecológico sometidas a agresiones de todo tipo, con otros espacios degradados y marginales, fruto de la expansión urbana e industrial. La restauración ecológico-paisajística de estos espacios y su acondicionamiento para el uso público han permitido configurar un "anillo verde multifunción" en torno a la ciudad que está proporcionando importantes beneficios ambientales, sociales y económicos. El anillo verde ha jugado un papel importante en la integración naturaleza-ciudad, equilibrando la oferta de zonas verdes entre todos los barrios y favoreciendo la conexión entre los espacios verdes urbanos y los espacios naturales del entorno agrícola. Ha propiciado, asimismo, el desarrollo de nuevas actividades relacionadas con el ocio y el esparcimiento y con la formación, educación y sensibilización ambiental; actividades que, por un lado, están suponiendo un revulsivo para el sector empresarial ambiental y la integración socio-laboral de determinados colectivos sociales y, por otro, contribuyen a la conservación de estos espacios, al convertirse los usuarios en sus mayores defensores y guardianes. La utilización de algunos de estos espacios como superficies de laminación de agua en épocas de avenidas para solventar problemas de inundación en las zonas industriales es otro ejemplo del valor añadido obtenido al plantear soluciones integrales. Los excelentes resultados obtenidos tras nueve años de trabajo demuestran la viabilidad técnica y económica y la rentabilidad social de este proyecto, que representa una prueba evidente de la decidida voluntad municipal de avanzar hacia un modelo de ciudad sostenible en armonía con el medio natural que la rodea.

  1. Results of the benchmarking in radiological protection practices during fuel reloads in the nuclear power plants of Limerick (BWR) and Ginna (PWR) in the United States of North America; Resultados del benchmarking en practicas de proteccion radiologica durante recargas de combustible en las centrales nucleoelectricas de Limerick (BWR) y Ginna (PWR) en los Estados Unidos de Norteamerica

    Energy Technology Data Exchange (ETDEWEB)

    Lara H, M. A., E-mail: marco.lara@cfe.gob.mx [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Carretera Cardel-Nautla Km 42.5, Alto Lucero, Veracruz (Mexico)

    2011-11-15

    The nuclear power plant of Laguna Verde, unique in our country, has been imposed several goals related with the continuous improvement of their acting; increase in the quantity of continuous days for operation cycle, improvement in the chemical indexes of the reactor coolant, improvement in the indexes of nuclear security, improvement in the indicators of industrial security, improvement in the standards of radiological protection, etc.; in this last item is precisely where is necessary to search creative solutions to be able to maintain the collective doses of the personnel so low as reasonably it is possible (ALARA) especially due to the last projects of extension of useful life of the nuclear power plant (zinc injection, noble metals and hydrogen) and of power increment of the nuclear power plant of Laguna Verde, same that represent in the short period an increment of collective dose and of exposition levels (until 200%) in very specific points of the primary systems of the reactor. (Author)

  2. Wilderness studies : Public hearing officer request [Laguna Atascosa National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a request for an a certain individual to be the hearing officer for the Laguna Atascosa National Wildlife Refuge public hearing.

  3. The Trail Inventory of Laguna Atascosa National Wildlife Refuge [Cycle 1

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of this report is to create a baseline inventory of all non-motorized trails on Laguna Atascosa National Wildlife Refuge. Trails in this inventory are...

  4. Contaminants survey of fish on Laguna Atascosa National Wildlife Refuge, Texas

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The primary source of water for the Laguna Atascosa National Wildlife Refuge (NWR), Texas is the Cayo Atascosa which receives water from the Rio Grande as irrigation...

  5. 76 FR 24512 - Laguna Cartagena National Wildlife Refuge, Lajas, Puerto Rico; Draft Comprehensive Conservation...

    Science.gov (United States)

    2011-05-02

    ... Fish and Wildlife Service Laguna Cartagena National Wildlife Refuge, Lajas, Puerto Rico; Draft Comprehensive Conservation Plan and Environmental Assessment AGENCY: Fish and Wildlife Service, Interior. ACTION: Notice of availability; request for comments. SUMMARY: We, the Fish and Wildlife Service...

  6. Spatial Vegetation Data for Mesa Verde National Park Vegetation Mapping Project

    Data.gov (United States)

    National Park Service, Department of the Interior — The Mesa Verde National Park Vegetation Map Database was developed as a primary product in the Mesa Verde National Park Vegetation Classification, Distribution, and...

  7. Andrés Laguna: a great medical humanist (1499-1559).

    Science.gov (United States)

    Kousoulis, Antonis A; Karamanou, Marianna; Androutsos, George

    2011-01-01

    Andrés Laguna, a Spanish humanist physician of the 16th century, occupies an important position in the history of medicine. An illustrious and brilliant mind, pioneer of anatomy and urology, Laguna proved to be a true pacifist and humanitarian with his knowledge standards and his political eloquence. He deserves to be remembered today as the perfect example of the Renaissance men, a true Homo Universalis.

  8. Hatching success of Caspian terns nesting in the lower Laguna Madre, Texas, USA

    Science.gov (United States)

    Mitchell, C.A.; Custer, T.W.

    1986-01-01

    The average clutch size of Caspian Terns nesting in a colony in the Lower Laguna Madre near Laguna Vista, Texas, USA in 1984 was 1.9 eggs per nest. Using the Mayfield method for calculating success, one egg hatched in 84.1% of the nests and 69.8% of the eggs laid hatched. These hatching estimates are as high or higher than estimates from colonies in other areas.

  9. The Maars of the Tuxtla Volcanic Field: the Example of 'laguna Pizatal'

    Science.gov (United States)

    Espindola, J.; Zamora-Camacho, A.; Hernandez-Cardona, A.; Alvarez del Castillo, E.; Godinez, M.

    2013-12-01

    Los Tuxtlas Volcanic Field (TVF), also known as Los Tuxtlas massif, is a structure of volcanic rocks rising conspicuously in the south-central part of the coastal plains of eastern Mexico. The TVF seems related to the upper cretaceous magmatism of the NW part of the Gulf's margin (e.g. San Carlos and Sierra de Tamaulipas alkaline complexes) rather than to the nearby Mexican Volcanic Belt. The volcanism in this field began in late Miocene and has continued in historical times, The TVF is composed of 4 large volcanoes (San Martin Tuxtla, San Martin Pajapan, Santa Marta, Cerro El Vigia), at least 365 volcanic cones and 43 maars. In this poster we present the distribution of the maars, their size and depths. These maars span from a few hundred km to almost 1 km in average diameter, and a few meters to several tens of meters in depth; most of them filled with lakes. As an example on the nature of these structures we present our results of the ongoing study of 'Laguna Pizatal or Pisatal' (18° 33'N, 95° 16.4'W, 428 masl) located some 3 km from the village of Reforma, on the western side of San Martin Tuxtla volcano. Laguna Pisatal is a maar some 500 meters in radius and a depth about 40 meters from the surrounding ground level. It is covered by a lake 200 m2 in extent fed by a spring discharging on its western side. We examined a succession of 15 layers on the margins of the maar, these layers are blast deposits of different sizes interbedded by surge deposits. Most of the contacts between layers are irregular; which suggests scouring during deposition of the upper beds. This in turn suggests that the layers were deposited in a rapid series of explosions, which mixed juvenile material with fragments of the preexisting bedrock. We were unable to find the extent of these deposits since the surrounding areas are nowadays sugar cane plantations and the lake has overspilled in several occassions.

  10. Strategic analysis for the MER Cape Verde approach

    Science.gov (United States)

    Gaines, D.; Belluta, P.; Herman, J.; Hwang, P.; Mukai, R.; Porter, D.; Jones, B.; Wood, E.; Grotzinger, J.; Edgar, L.; Hayes, A.; Hare, T.; Squyres, S.

    2009-01-01

    The Mars Exploration Rover Opportunity has recently completed a two year campaign studying Victoria Crater. The campaign culminated in a close approach of Cape Verde in order to acquire high resolution imagery of the exposed stratigraphy in the cliff face. The close approach to Cape Verde provided significant challenges for every subsystem of the rover as the rover needed to traverse difficult, uncharacterised terrain and approach a cliff face with the potential of blocking out solar energy and communications with Earth. In this paper we describe the strategic analyses performed by the science and engineering teams so that we could successfully achieve the science objectives while keeping the rover safe. ??2009 IEEE.

  11. La química verde y el desarrollo sustentable

    Directory of Open Access Journals (Sweden)

    Angélica Sierra

    2014-02-01

    Full Text Available La química es indispensable para asegurar que las siguientes generaciones de productos químicos, materiales y energía sean sustentables. La química es también esencial para limpiar el planeta de contaminantes ya existentes. En este artículo se presenta una breve revisión del desarrollo de la Química Verde, enfatizando sus principios, así como citando ejemplos específicos de compuestos usados en procesos no contaminantes sustentables y de apoyos otorgados para motivar el desarrollo de procesos sustentables y Química Verde.

  12. Clima, cultura y disponibilidad de espacios verdes urbanos

    OpenAIRE

    Sierra, Eduardo Mario; Pérez, Silvia Patricia; Nizzero, Gustavo Raúl

    2002-01-01

    p.165-171 El rápido crecimiento urbano mundial hace que la calidad de vida dependa cada vez más de la disponibilidad de espacios verdes. Este trabajo trata de relacionar la disponibilidad de espacios verdes urbanos públicos con los factores climáticos y culturales. Las ciudades del Hemisferio Norte en países de cultura europea, donde se llevan a cabo programas de sustentabilidad muestran mayores disponibilidades lo cual refleja el impacto de los factores culturales. Desde el punto de vista...

  13. Espacios verdes urbanos, fortalezas, amenazas y oportunidades de mejora

    OpenAIRE

    Breuste, Juergen; Artmann, A.; Wurster, D.; Voigt, Annette; Faggi, Ana Maria

    2016-01-01

    En términos de sustentabilidad es preciso entender, diseñar y manejar el verde urbano adecuadamente desde una perspectiva ecológica, estética y recreativa (FTL-HSR & ZSA 2006). Se presentan aquí a modo de ejemplos resultados de investigaciones realizadas en Buenos Aires, Salzburgo y Munich, que aportan ideas sobre el valor de los espacios verdes y de las problemáticas a los cuales se enfrentan. Fil: Breuste, Juergen. Lodron-Paris University; Austria Fil: Artmann, A.. Fil: Wurster, ...

  14. SEBARAN HORIZONTAL JUVENIL UDANG DI PERAIRAN LAGUNA SEGARA ANAKAN

    Directory of Open Access Journals (Sweden)

    Didik Wahyu Hendro Tjahjo

    2016-03-01

    Full Text Available Terdapat sembilan spesies udang ekonomis penting di  perairan Cilacap dan sekitarnya yang termasuk komoditas perikanan tangkap, dimana sebanyak 34% dari total udang yang tertangkap nelayan, menetas dan dibesarkan di kawasan laguna Segara Anakan. Kondisi ini mengisyaratkan agar dalam pengelolaan perikanan, Segara Anakan perlu mendapat perhatian termasuk aspek ekologis perairan. Untuk itu dilakukan penelitian dengan tujuan untuk mengkaji kelimpahan dan sebaran horizontal juvenil udang  serta preferensi habitatnya di perairan Laguna Segara Anakan. Penelitian lapang dilakukan sebanyak 3 kali frekuensi pengambilan sampel, yaitu pada April, September dan Desember 2012. Pengambilan sampel udang dilakukan dengan alat tangkap mini beam trawl secara terstratifikasi pada delapan titik stasiun pengamatan. Analisa data meliputi kelimpahan dan distribusi horizontal udang, serta preferensi habitatnya. Kelimpahan juvenil udang tertinggi ditemukan di stasiun Klaces dan terendah di stasiun Sapuregel Kecil, dimana nilainya berkisar antara 8-446 ekor/1000 m2 (udang penaeid 8-336 ekor/1000 m2. Post larva udang penaeid tampak dapat  menyesuaikan diri terhadap fluktuasi salinitas yang berkisar antara 2-35 ‰ hingga menjadi juvenil muda serta siap bermigrasi kembali ke laut hingga dewasa untuk melakukan siklus berikutnya. Dari data variasi kelimpahan dan pola sebaran juvenil udang diperoleh gambaran bahwa preferensi habitat bagi udang adalah tipe dasar perairan yang lembut (soft, biasanya terdiri dari campuran lumpur dan pasir.  Kelompok udang penaeid ini tersebar relatif merata di perairan laguna.   There are nine species of economically important shrimp in Cilacap water  which  belonging to  fisheries commodities, where as many as 34 % of the total shrimp caughted are hatched and raised in the Segara Anakan lagoon. This condition implies that in fisheries management option, Segara Anakan lagoon  include its ecological aspects need attention.  In this

  15. A transdisciplinaridade no encino superior em Cabo Verde

    Directory of Open Access Journals (Sweden)

    Jorge Brito Sousa

    2003-01-01

    Full Text Available Historical and geographic reasons transformed Cape Verde, across the last five centuries, into a place of civilizations´ confluence and experimentation / acclimatization of the most diverse resources and ideas. This was expressed as an open society to the world, an economy of circulation and through the universal personality of the Capeverdian man. This strategic position in a globalized world requires a transdisciplinary vision from the citizen. Higher education is a privileged vehicle for such an end and under the scope of UNESCO´s recommendations transdisciplinarity must be part of the new 21st century university. The birth of a transdisciplinary university in Cape Verde looks like a natural thing. Such university was born in 2001(University Jean Piaget of Cape Verde and already develops a transdisciplinary action and research pointed in this direction. However, Cape Verde´s context of higher education lacks of bigger attention and the transdisciplinary vision would be more than necessary for a liberal education, for the benefit of a terrestrial citizenship

  16. New Constraints on Maar Geometry and Sedimentary Fill of Laguna Potrok Aike, Southern Patagonia

    Science.gov (United States)

    Gebhardt, C. A.; Niessen, F.; Anselmetti, F.; Ariztegui, D.; de Batist, M.; Haberzettl, T.; Ohlendorf, C.; Zolitschka, B.

    2007-12-01

    Laguna Potrok Aike is located in Southern Patagonia, Argentina, at 52°S and 70°W. The maar lake has a diameter of 3.5 km and is almost circular and bowl-shaped with a deep, flat plain (100 m water depth) in its central part. Steep flanks separate the lake shoulders at 15 to 35 m water depth from the central plain. The lake is situated in the Pali Aike Volcanic Field at the present boundary between the Southern Hemispheric Westerlies and the Antarctic Polar Front. Its lake level is highly susceptible to changes in the Antarctic Circumpolar Current that controls the regional precipitation patterns. Its sedimentary infill possibly contains a long and continuous record of several glacial and interglacial cycles, which is unique in the southern South American realm. Two major stratigraphic units (I and II) were distinguished in the seismic sections. Unit I consists of the lacustrine infill and was further subdivided into Sub-units I-a and I-b on the lake shoulders and I-ab, I-c, and I-d in the central basin. Sub-units I-a and I-b on the lake shoulders are separated by a major unconformity and contain several paleoshoreline structures formed during a step-wise transgression after a lake level lowstand of approx. 35 m below the present lake level. In the central basin, Sub-units I-a and I-b are merged into Sub-unit I-ab, not being separated by any unconformity. Pelagic sedimentation dominates in the northern and central parts, whereas mass movement deposits were found in the southern, western and eastern parts close to the steep diatreme flanks. The boundary between I-ab and I-c is non-erosive with I-ab forming downlaps onto I-c from the eastern and western parts of the lake, pointing at a significantly lower lake level during its accumulation. Sub-unit I-d shows similar characteristics as I-ab. The bedrock (Unit II) that forms the steep diatreme flanks consists of the well-layered sandstones found in the lake surroundings.

  17. Flora planctónica de laguna Lagartos, Quintana Roo Planktonic flora from Lagartos Lagoon, Quintana Roo

    Directory of Open Access Journals (Sweden)

    Viridiana Margarita Nava-Ruiz

    2012-09-01

    Full Text Available Se presenta una lista de la flora planctónica de la laguna Lagartos, basada en la observación de muestras superficiales obtenidas entre noviembre de 2007 a septiembre de 2008. Las muestras se recolectaron con una botella Van Dorn de 2 litros en la parte central de la laguna; se registraron 67 taxa: 28 Bacillariophyta, 22 Cyanoprokaryota, 7 Chlorophyta, 6 Dinoflagellata, 2 Euglenophyta y 2 Cryptophyta. Las cianofitas dominaron durante todo el periodo de estudio, con una contribución mayor al 80% de la abundancia total del fitoplancton. Son nuevos registros para México 13 especies: Chroococcus pulcherrimus, Coelosphaerium confertum, Cyanodyction iac, Phormidium pachydermaticum, Planktolyngbya contorta, Rhodomonas minuta, Amphidinium massartii, Ensiculifera cf. loeblichii, Heterocapsa cf. pseudotriquetra, Prorocentrum cassubicum, Licmophora normaniana, Fistulifera saprophila y Amphora richardiana. Todos los taxa listados se ilustran con microfotografías.The planktonic flora from Lagartos Lagoon, Quintana Roo, was examined based on the observation of samples collected from November 2007 to September 2008. The superficial samples were collected with a Van Dorn bottle of 2 L, in the core part of the lagoon. A total of 67 taxa were identified: 28 Bacillariophyta, 22 Cyanoprokaryota, 7 Chlorophyta, 6 Dinoflagellata, 2 Euglenophyta and 2 Cryptophyta. Nevertheless, the blue green algae dominated during all study period, with more of 80% to the total abundance of the phytoplankton. The species Chroococcus pulcherrimus, Coelosphaerium confertum, Cyanodyction iac, Phormidium pachydermaticum, Planktolyngbya contorta, Rhodomonas minuta, Amphidinium massartii, Ensiculifera cf. loeblichii, Heterocapsa cf. pseudotriquetra, Prorocentrum cassubicum, Licmophora normaniana, Fistulifera saprophila and Amphora richardiana were recorded for the first time in Mexico. All the taxa are illustrated with microphotographs.

  18. Factors controlling navigation-channel Shoaling in Laguna Madre, Texas

    Science.gov (United States)

    Morton, R.A.; Nava, R.C.; Arhelger, M.

    2001-01-01

    Shoaling in the Gulf Intracoastal Waterway of Laguna Madre, Tex., is caused primarily by recycling of dredged sediments. Sediment recycling, which is controlled by water depth and location with respect to the predominant wind-driven currents, is minimal where dredged material is placed on tidal flats that are either flooded infrequently or where the water is extremely shallow. In contrast, nearly all of the dredged material placed in open water >1.5 m deep is reworked and either transported back into the channel or dispersed into the surrounding lagoon. A sediment flux analysis incorporating geotechnical properties demonstrated that erosion and not postemplacement compaction caused most sediment losses from the placement areas. Comparing sediment properties in the placement areas and natural lagoon indicated that the remaining dredged material is mostly a residual of initial channel construction. Experimental containment designs (shallow subaqueous mound, submerged levee, and emergent levee) constructed in high-maintenance areas to reduce reworking did not retain large volumes of dredged material. The emergent levee provided the greatest retention potential approximately 2 years after construction.

  19. Crab death assemblages from Laguna Madre and vicinity, Texas

    Energy Technology Data Exchange (ETDEWEB)

    Plotnick, R.E.; McCarroll, S. (Univ. of Illinois, Chicago (USA)); Powell, E. (Texas A M Univ., College Station (USA))

    1990-02-01

    Crabs are a major component of modern marine ecosystems, but are only rarely described in fossil assemblages. Studies of brachyuran taphonomy have examined either the fossil end-products of the taphonomic process or the very earliest stages of decay and decomposition. The next logical step is the analysis of modern crab death assemblages; i.e., studies that examine taphonomic loss in areas where the composition of the living assemblage is known. The authors studied crab death assemblages in shallow water sediments at several localities in an near Laguna Madre, Texas. Nearly every sample examined contained some crab remains, most commonly in the form of isolated claws (dactyl and propodus). A crab fauna associated with a buried grass bed contained abundant remains of the xanthid crab Dyspanopeus texanus, including carapaces, chelipeds, and thoraxes, as well as fragments of the portunid Callinectes sapidus and the majiid Libinia dubia. Crab remains may be an overlooked portion of many preserved benthic assemblages, both in recent and modern sediments.

  20. The Marine Ecology of the Laguna San Rafael (Southern Chile): Ice Scour and Opportunism

    Science.gov (United States)

    Davenport, John

    1995-07-01

    Surveys of the intertidal fauna and flora, the plankton, fish, birds and marine mammals of the Laguna San Rafael were carried out by a Raleigh International Expedition in January-February 1993. The Laguna is dominated by the effects of scouring, low temperature and low salinity produced by the calving, tide-water San Rafael glacier that discharges into the Laguna. The fauna and flora are simple and largely limited to a small sector of the Laguna, relatively unaffected by ice. There is a predominance of herbivorous fish, ducks, geese and swans, feeding mainly on macroalgae. Penguins, cormorants, sea lions and porpoises make up the top predators. The strandline is influenced by very heavy rainfall and supports a fauna of freshwater and terrestrial molluscs and earthworms, fed upon by birds and frogs. Large numbers of mussels are present in the north-eastern sector of the Laguna, but many are found in poor condition, high on the shore. It is suggested that poor condition and mortality are caused by large calving waves that dislodge mussels. Such waves are caused by occasional loss of massive quantities of ice from the glacier.

  1. Cape Verde: Marketing Good Governance Kap Verde: Die Vermarktung von Good Governance

    Directory of Open Access Journals (Sweden)

    Bruce Baker

    2009-01-01

    Full Text Available Faced with a lack of natural resources Cape Verde has made good governance one of its most marketable products. Running parallel to the institutionalisation of democratic politics there has been an overhaul and growing sophistication in public administration, though certain weaknesses persist. This report argues that it is reform and improvement in this area in particular that has enabled this small island state to punch above its weight and achieve remarkable social, economic and political results. But will the successful formula of the past decade prove sufficient for the future? Poverty and unemployment have by no means been conquered. Much of the economic growth has been based in the tourist sector and the government is well aware of the dangers of over-reliance on a single industry. Cape Verde’s midway location between South America and Europe and its increasing international transport connections will continue to offer advantages to drug traffickers. The next few years of the world financial crisis will show whether marketing good governance is enough and whether this is the model for small resource developing states. Der Inselstaat Kap Verde hat seine Anstrengungen zu guter Regierungsführung (Good Governance erfolgreich demonstriert. Parallel zur Institutionalisierung demokratischer Regierungsstrukturen wurde die Verwaltung reformiert und modernisiert, wenn auch immer noch Problembereiche erkennbar sind. Der Autor sieht insbesondere in den politischen und administrativen Reformen den Hintergrund für die erfolgreiche soziale, wirtschaftliche und politische Entwicklung dieser kleinen Inselrepublik. Aber wird dieses Rezept, das im vergangenen Jahrzehnt seine Wirksamkeit beweisen konnte, auch in Zukunft ausreichend sein? Armut und Unterbeschäftigung sind keineswegs besiegt. Ein Großteil des Wirtschaftswachstums basiert auf dem Tourismussektor; die Regierung ist sich der Gefahr wohl bewusst, die in zu großer Abhängigkeit von einem

  2. Disentangling High Frequency Climate Oscillations In A Volcanic Setting Laguna Lejia, Chile

    Science.gov (United States)

    Saltzman, S. H.; Ukstins Peate, I.; Giralt, S.; Peate, D. W.; van Alderwerelt, B. M.

    2015-12-01

    Our understanding of the tropics response to periods of rapid climate change such as CAPE I and the Younger Dryas is limited. Laguna Lejia (23°30'0" S 67°42'0" E ~4,300m asl), Chile is a small alkaline paleolake located in the central Altiplano. The volcanoes Lascar, Chiliques, Aguas Calientes and Acamarachi surround it. 1-3 mm laminations in calcareous clay sediments deposited on the southern terrace of Lejia record high-resolution chemical variability in the lake. Preliminary U-Th ages range from 19,567 +739/- 734 yr to 4208 +431/-429 yr, indicating that the Lejia terrace deposits span both CAPE I and the Younger Dryas, periods of rapid global climate change. Changes in the major and trace element composition, δ18O and δ13 C isotopic ratios, and the amount of Li, Mg, Ca, and Sr that can be readily leached from high magnesium smectite clays provide a direct proxy for hydrologic fluctuations. A climate signal can be detected through reoccurring trends in the chemical variability of these sediments; however, the detection of this signal is complicated by interaction with surrounding volcanic edifices. Statistical methods such as PCA analyses using R have been implemented to separate groupings of volcanic controlled elemental fluctuations (Fe, Zr, Nd, Ti, and Al) from ones under the influence of climate. Spectral analyses have been applied to high-resolution major element data collected on Lejia's paleoshores tufa deposits. Data was collected on Ca, Mg and As at .5 um intervals using a Jeol JXA- 8230 Electron Microprobe at the University of Iowa, Earth and Environmental Sciences. These analyses provided statistical evidence for cyclisity at intervals of 5-15 um and 75-150 um in the banding of the tufas. While previous literature attributes the larger bands to annual chemical cycles the origin of the smaller bands is currently under investigation.

  3. Macroalgas bentónicas de la laguna de Tampamachoco, Veracruz, México

    OpenAIRE

    Kurt M. Dreckmann; Pérez-Hemández, Marco A

    2016-01-01

    A total of 23 macroalgal species were identified in Laguna Tampamachoco, Veracruz, Mexico: 9 ChIorophyceae, 2 Phaeophyceae and 12 Rhodophyceae. Algal richness per area is relatively higher (60-100 times) than in another coastal lagoon and one estuary of the area (Laguna Madre and Tamiahua with 29 and 22 species respectively). We report the presence of Phaeophyceae in this environment for the first time. The three sites have 58 species in total, twice the number reported from any other North A...

  4. Investigation of chikungunya fever outbreak in Laguna, Philippines, 2012

    Science.gov (United States)

    Zapanta, Ma Justina; de los Reyes, Vikki Carr; Sucaldito, Ma Nemia; Tayag, Enrique

    2015-01-01

    Background In July 2012, the Philippines National Epidemiology Center received a report of a suspected chikungunya fever outbreak in San Pablo City, Laguna Province, the first chikungunya cases reported from the city since surveillance started in 2007. We conducted an outbreak investigation to identify risk factors associated with chikungunya. Methods A case was defined as any resident of Concepcion Village in San Pablo City who had fever of at least two days duration and either joint pains or rash between 23 June and 6 August 2012. Cases were ascertained by conducting house-to-house canvassing and medical records review. An unmatched case-control study was conducted and analysed using a multivariate logistic regression. An environmental investigation was conducted by observing water and sanitation practices, and 100 households were surveyed to determine House and Breteau Indices. Human serum samples were collected for confirmation for chikungunya IgM through enzyme-linked immunosorbent assay. Results There were 98 cases identified. Multivariate analysis revealed that having a chikungunya case in the household (adjusted odds ratio [aOR]: 6.2; 95% confidence interval [CI]: 3.0–12.9) and disposing of garbage haphazardly (aOR: 2.7; 95% CI: 1.4–5.4) were associated with illness. House and Breteau Indices were 27% and 28%, respectively. Fifty-eight of 84 (69%) serum samples were positive for chikungunya IgM. Conclusion It was not surprising that having a chikungunya case in a household was associated with illness in this outbreak. However, haphazard garbage disposal is not an established risk factor for the disease, although this could be linked to increased breeding sites for mosquitoes. PMID:26668759

  5. Investigation of chikungunya fever outbreak in Laguna, Philippines, 2012

    Directory of Open Access Journals (Sweden)

    Julius Erving Ballera

    2015-12-01

    Full Text Available Background: In July 2012, the Philippines National Epidemiology Center received a report of a suspected chikungunya fever outbreak in San Pablo City, Laguna Province, the first chikungunya cases reported from the city since surveillance started in 2007. We conducted an outbreak investigation to identify risk factors associated with chikungunya. Methods: A case was defined as any resident of Concepcion Village in San Pablo City who had fever of at least two days duration and either joint pains or rash between 23 June and 6 August 2012. Cases were ascertained by conducting house-to-house canvassing and medical records review. An unmatched case-control study was conducted and analysed using a multivariate logistic regression. An environmental investigation was conducted by observing water and sanitation practices, and 100 households were surveyed to determine House and Breteau Indices. Human serum samples were collected for confirmation for chikungunya IgM through enzyme-linked immunosorbent assay. Results: There were 98 cases identified. Multivariate analysis revealed that having a chikungunya case in the household (adjusted odds ratio [aOR]: 6.2; 95% confidence interval [CI]: 3.0–12.9 and disposing of garbage haphazardly (aOR: 2.7; 95% CI: 1.4–5.4 were associated with illness. House and Breteau Indices were 27% and 28%, respectively. Fifty-eight of 84 (69% serum samples were positive for chikungunya IgM. Conclusion: It was not surprising that having a chikungunya case in a household was associated with illness in this outbreak. However, haphazard garbage disposal is not an established risk factor for the disease, although this could be linked to increased breeding sites for mosquitoes.

  6. Analysis of stable isotope ratios (δ18O and δ2H) in precipitation of the Verde River watershed, Arizona 2013 through 2014

    Science.gov (United States)

    Beisner, Kimberly R.; Paretti, Nicholas V.; Tucci, Rachel S.

    2016-04-25

    Stable isotope delta values (δ18O and δ2H) of precipitation can vary with elevation, and quantification of the precipitation elevation gradient can be used to predict recharge elevation within a watershed. Precipitation samples were analyzed for stable isotope delta values between 2003 and 2014 from the Verde River watershed of north-central Arizona. Results indicate a significant decrease in summer isotopic values overtime at 3,100-, 4,100-, 6,100-, 7,100-, and 8,100-feet elevation. The updated local meteoric water line for the area is δ2H = 7.11 δ18O + 3.40. Equations to predict stable isotopic values based on elevation were updated from previous publications in Blasch and others (2006), Blasch and Bryson (2007), and Bryson and others (2007). New equations were separated for samples from the Camp Verde to Flagstaff transect and the Prescott to Chino Valley transect. For the Camp Verde to Flagstaff transect, the new equations for winter precipitation are δ18O = -0.0004z − 8.87 and δ2H = -0.0029z − 59.8 (where z represents elevation in feet) and the summer precipitation equations were not statistically significant. For the Prescott to Chino Valley transect, the new equations for summer precipitation are δ18O = -0.0005z − 3.22 and δ2H = -0.0022z − 27.9; the winter precipitation equations were not statistically significant and, notably, stable isotope values were similar across all elevations. Interpretation of elevation of recharge contributing to surface and groundwaters in the Verde River watershed using the updated equations for the Camp Verde to Flagstaff transect will give lower elevation values compared with interpretations presented in the previous studies. For waters in the Prescott and Chino Valley area, more information is needed to understand local controls on stable isotope values related to elevation.

  7. Talento verde: caracterización y búsqueda

    Directory of Open Access Journals (Sweden)

    María del Carmen Torres-Salazar

    2015-01-01

    Full Text Available Introducción: Los impactos del calentamiento global y el cambio climático son una preocupación en prácticamente todos los sectores de la sociedad, debido a las consecuencias que ya se perciben y que afectarán cada día más tanto a los sistemas naturales como a los creados por el hombre, generalmente de forma negativa. Para revertir estos efectos negativos y no continuar deteriorando el medio ambiente, es necesario un tipo especial de personas que sean capaces de tomar las decisiones adecuadas en los ámbitos en los que se desenvuelven. En esta investigación, estos seres humanos se denominan: “personas con talento verde”. El término talento verde no ha sido caracterizado y su uso es aun restringido. Esta investigación hace una caracterización del talento verde y propone una encuesta para detectar a las personas que cuentan con estas características. En este artículo, se reporta solo la validación de la encuesta. Es importante hacer notar que este trabajo forma parte de una investigación más amplia que busca conocer la relación entre directivos con talento verde y prácticas de cadena de suministro sustentable. Método: La caracterización del talento verde se realizó a través de la metodología de representaciones sociales, de la cual surgieron una serie de preguntas que buscan las características de talento verde en directivos de empresas y que forman parte de una encuesta de mayor cobertura que fue piloteada para su validación. La confiabilidad se midió a través del Alfa de Crombach y la validez por un Análisis Factorial. Resultados: Se encontraron nueve aspectos que caracterizan a las personas con talento verde, con las cuales se construyeron también nueve preguntas. Estas preguntas se hicieron a 25 directivos de empresas que participan en la Cámara de la Industria de la Transformación (CANACINTRA con el objetivo de validar el instrumento. El alfa de Crombrach obtenido fue del 0.948 y el análisis factorial indica

  8. IN and CCN Measurements on RV Polarstern and Cape Verde

    Science.gov (United States)

    Welti, André; Herenz, Paul; Henning, Silvia; Stratmann, Frank

    2016-04-01

    Two field campaigns, one situated on RV Polarstern (Oct. - Dec. 2015) and one on the Cape Verde islands (Jan. - Feb. 2016) measuring ice nuclei (IN) and cloud condensation nuclei (CCN) concentrations as a function of supersaturation and temperature are presented. The Polarstern cruise from Bremerhaven to Cape Town yields a cross section of IN and CCN concentrations from 54°N to 35°S and passes the Cape Verde Islands at 15°N. Measurements were conducted using the commercial CCNC and SPIN instruments from DMT. During both campaigns, a comprehensive set of aerosol characterization data including size distribution, optical properties and chemical information were measured in parallel. The ship based measurements provide a measure of variability in IN/CCN concentration with geographic position. As an example a clear influence on IN and CCN number concentration of the Saharan desert dust outflow between the Canary Islands and Cape Verde or the continental aerosol from Europe and South Africa was observed. The measurements on Cape Verde provide information on the temporal variability at a fixed position varying between clean marine and dust influenced conditions. Both datasets are related to auxiliary data of aerosol size distribution and chemical composition. The datasets are used to distinguish the influence of local sources and background concentration of IN/CCN. By combining of the geographically fix measurements with the geographical cross section, typical ranges of IN and CCN concentration are derived. The datasets will be part of the BACCHUS database thereby providing valuable input for future climate modeling activities.

  9. Les enjeux écologiques de Palo Verde (Costa Rica

    Directory of Open Access Journals (Sweden)

    Bertrand LÉVY

    1992-09-01

    Full Text Available Près de Palo Verde a été créé un parc naturel. Un projet d’irrigation risque de perturber l’écologie de la région. Une carte de son écosystème a été établie par télédétection, pour évaluer l’impact d’un tel projet.

  10. Importance of implementing program Screening Neonatal Hemoglobinopathies in Cape Verde

    OpenAIRE

    Leonel Barbosa Goncalves

    2015-01-01

    Hemoglobinopathies are hereditary blood diseases, the most frequent sickle cell anemia. To date not have curative treatment, unless bone marrow transplant, which has yet been carried out experimentally. The implementation of screening programs of hemoglobinopathies in health services in Cape Verde is shown to be of great relevance and importance to public health, as it will allow early detection and treatment associated with hemoglobinopathies. [Natl J Med Res 2015; 5(1.000): 87-88

  11. REGISTROS NUEVOS O POCO CONOCIDOS DE AVES MIGRATORIAS EN LA LAGUNA DEL OTÚN, PARQUE NACIONAL NATURAL LOS NEVADOS, RISARALDA, COLOMBIA

    Directory of Open Access Journals (Sweden)

    ORLANDO ACEVEDO-CHARRY

    2013-01-01

    Full Text Available Colombia es un sitio importante para las aves migratorias. Sin embargo, aún falta mucho conocimiento de dónde estas se encuentran durante su paso o permanencia por el país y cuáles utilizan los páramos. Registramos nuevas especies de aves migratorias para la laguna del Otún, inmersa en un complejo de humedales declarados sitio Ramsar desde el 2008. La laguna está localizada en el Parque Nacional Natural Los Nevados a 3932 msnm, en ecosistema de páramo, en la Cordillera Central de los Andes de Colombia. Durante cinco salidas entre 2010 y 2012 se registraron cuatro nuevas especies de aves migratorias para el parque: Anas acuta, Pandion haliaetus, Riparia riparia y Dendroica petechia. Adicionalmente, se registró una ampliación del rango altitudinal para dos especies mi- gratorias que solo habían sido registradas en la región a menos de 3500 msnm: Tringa flavipes e Hirundo rustica. Estas observaciones sugieren que dichas especies podrían tolerar condiciones de alta montaña y utilizar el páramo. Es necesario estudiar a fondo las diná- micas migratorias y el uso de hábitat de alta montaña por las aves migratorias.

  12. Verde Macael: A Serpentinite Wrongly Referred to as a Marble

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    Santiago del Barrio

    2013-02-01

    Full Text Available Serpentinites are used in both exterior and interior locations, but not all serpentinites are equal: they vary in physical-mechanical behavior and are not all suitable for similar uses. The serpentinites most commonly used worldwide come from India, Pakistan or Egypt. Spain has traditionally quarried two ultramafic massifs, one in Galicia (Verde Pirineos and one in Andalucía (Verde Macael. Some of these quarries were small family-run businesses. In both cases, these rocks are commercially available as “green marble.” These serpentinites commonly have a high degree of carbonation, but the process does not always take place with the same intensity. Carbonate can act as a cementing agent of the other phases, increasing the mechanical strength parameters. As a result, an improvement in the strength conditions is achieved, but a misinterpretation of the suitability of the rock may occur because a perception among users that “green marble” is similar to geologically defined marble. This may lead to inappropriate applications as an ornamental stone. At a time of economic crisis in Europe, the natural stone sector is encouraged to invest in research to identify the best quality products that can compete profitably with those currently being imported from other countries. This paper provides a comparison of properties of the Verde Macael serpentinite with a true marble in the hope of contributing to improving the natural stone industrial sector.

  13. Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas

    Science.gov (United States)

    Mitchell, C.A.; Custer, T.W.; Zwank, P.J.

    1992-01-01

    Behavior of redheads (Aythya americana) during winter was studied on the hypersaline lower Laguna Madre and adjacent freshwater to brackish water ponds of southern Texas. On Laguna Madre, feeding (46%) and sleeping (37%) were the most common behaviors. Redheads fed more during early morning (64%) than during the rest of the day (40%); feeding activity was negatively correlated with temperature. Redheads fed more often by dipping (58%) than by tipping (25%), diving (16%), or gleaning (0.1%). Water depth was least where they fed by dipping (16 cm), greatest where diving (75 cm), and intermediate where tipping (26 cm). Feeding sequences averaged 5.3 s for dipping, 8.1 s for tipping, and 19.2 s for diving. Redheads usually were present on freshwater to brackish water ponds adjacent to Laguna Madre only during daylight hours, and use of those areas declined as winter progressed. Sleeping (75%) was the most frequent behavior at ponds, followed by preening (10%), swimming (10%), and feeding (0.4%). Because redheads fed almost exclusively on shoalgrass while dipping and tipping in shallow water and shoalgrass meadows have declined in the lower Laguna Madre, proper management of the remaining shoalgrass habitat is necessary to ensure that this area remains the major wintering area for redheads.

  14. A pollen diagram from “Laguna de la Herrera” (Sabana de Bogota)

    NARCIS (Netherlands)

    Hammen, van der T.; Gonzalez, E.

    1965-01-01

    The Laguna de La Herrera (alt. ca 2550 m) is a lake situated on the western border of the Sabana de Bogotá, near Mosquera (dept. of Cundinamarca, Colombia) (fig. 2). This part of the Sabana has a relatively dry climate (appr. 600—700 mm rainfall), as it lies in the rain-shadow of the hills that bord

  15. Dormideros de Grulla Común en la Laguna de Gallocanta

    OpenAIRE

    2006-01-01

    Citación completa: Bautista LM. 2006. Dormideros de Grulla Común en la Laguna de Gallocanta. págs.: 133-136, en: Fauna en acción; Guía para observar comportamiento animal en España. Eds.: M. Soler y colaboradores. Lynx edicions. Bellaterra, Barcelona.

  16. Design Study for a Future Laguna-LBNO Long-Baseline Neutrino Facility at CERN

    CERN Document Server

    Alabau-Gonzalvo, J; Antoniou, F; Benedikt, M; Calviani, M; Efthymiopoulos, I; Ferrari, A; Garoby, R; Gerigk, F; Gilardoni, S; Goddard, B; Kosmicki, A; Lazaridis, C; Osborne, J; Papaphillippou, Y; Parfenova, A; Shaposhnikova, E; Steerenberg, R; Velten, P; Vincke, H

    2013-01-01

    The Large Apparatus studying Grand Unification and Neutrino Astrophysics (LAGUNA) study [1] investigated seven pre-selected underground sites in Europe (Finland, France, Italy, Poland, Romania, Spain and UK), capable of housing large volume detectors for terrestrial, accelerator generated and astrophysical neutrino research. The study was focused on geo-technical assessment of the sites, concluding that no show-stoppers exist for the construction of the required large underground caverns in the chosen sites. The LAGUNA-LBNO FP7/EC-funded design study extends the LAGUNA study in two key aspects: the detailed engineering of detector construction and operation, and the study of a long-baseline neutrino beam from CERN, and possibly other accelerator centres in Europe. Based on the findings of the LAGUNA study, the Pyh¨asalmi mine in Finland is chosen as prime site for the far detector location. The mine offers the deepest underground location in Europe (-1400 m) and a baseline of 2’300 km from CERN (Fig. 1). ...

  17. Population size, breeding biology and on-land threats of Cape Verde petrel (Pterodroma feae) in Fogo Island, Cape Verde

    Science.gov (United States)

    Zango, Laura; Calabuig, Pascual; Stefan, Laura M.; González-Solís, Jacob

    2017-01-01

    Cape Verde petrel (Pterodroma feae) is currently considered near threatened, but little is known about its population size, breeding biology and on land threats, jeopardizing its management and conservation. To improve this situation, we captured, marked and recaptured (CMR) birds using mist-nets over 10 years; measured and sexed them; monitored up to 14 burrows, deployed GPS devices on breeders and analyzed activity data of geolocators retrieved from breeders in Fogo (Cape Verde). We set cat traps over the colony and investigated their domestic/feral origin by marking domestic cats from a nearby village with transponders, by deploying GPS devices on domestic cats and by performing stable isotope analyses of fur of the trapped and domestic cats. The population of Fogo was estimated to be 293 birds, including immatures (95% CI: 233–254, CMR modelling). Based on geolocator activity data and nest monitoring we determined the breeding phenology of this species and we found biometric differences between sexes. While monitoring breeding performance, we verified a still ongoing cat predation and human harvesting. Overall, data gathered from trapped cats without transponder, cats GPS trips and the distinct isotopic values between domestic and trapped cats suggest cats visiting the colony are of feral origin. GPS tracks from breeders showed birds left and returned to the colony using the sector NE of the islands, where high level of public lights should be avoided specially during the fledging period. Main threats for the Cape Verde petrel in the remaining breeding islands are currently unknown but likely to be similar to Fogo, calling for an urgent assessment of population trends and the control of main threats in all Cape Verde Islands and uplisting its conservation status. PMID:28369105

  18. Subsidence History of the Laguna Salada Basin in Northeastern Baja California, Mexico

    Science.gov (United States)

    Contreras, J.; Martin-Barajas, A.; Herguera, J.

    2008-12-01

    The Salton Trough region in southern California and the Mexicali valley in northwestern Mexico are areas of (i) rapid subsidence due to trans-tension along the San Andreas-Imperial fault system, and (ii) high flux of sediments transported by the Colorado River, all of which confer this region with a high potential to preserve a complete record of climatic and tectonic activity information. Here we present the subsidence history of the Laguna Salada basin, and the history of activity of the master bounding faults on its eastern side. The Laguna Salada is a lacustrine basin located west of the Mexicali valley and to the south of the Salton Trough. Sedimentological as well as time series analyses performed on two 42 m-long cores drilled in the center of the basin, estimated to span the past 50 and 70KaBP, indicate a modulation of the late Quaternary stratigraphy by cyclic variations in lake level driven by Milankovitch forcing. Based on these results we derive the long-term history of the basin from a gamma-ray log recovered from a 2.8 km-deep geothermal borehole drilled by the Mexican Power Company adjacent to the Laguna Salada fault. The stratigraphy of the deep borehole reveals a history of activity pulses related to the initial breakage of the Laguna Salada fault and its interaction with neighboring faults. A first pulse started at 1.5 Ma and records the initiation of the Laguna Salada fault and rapid uplift of the crystalline block of the Sierra Cucapa. A second pulse started around 1 Ma, and is very likely related to the hard linking of the Laguna Salada fault with the Cañada David detachment by the Cañon Rojo fault. The onset of the Laguna Salada fault at 1.5 Ma appears to be synchronous with an early Pleistocene regional fault reorganization among the San Jacinto, San Andreas and Elsinore fault systems in southern California, suggesting that this reorganization may have affected a large area from San Gorgonio pass to the northern Gulf of California.

  19. DINAMIKA LARVA IKAN SEBAGAI DASAR OPSI PENGELOLAAN SUMBER DAYA IKAN DI LAGUNA PULAU PARI KEPULAUAN SERIBU

    Directory of Open Access Journals (Sweden)

    Reny Puspasari

    2013-05-01

    Full Text Available Proses rekruitmen populasi ikan sangat ditentukan oleh kelangsungan hidup larva ikan yang ada di daerah pemijahan/asuhan. Laguna Pulau Pari merupakan daerah pemjahan bagi banyak jenis larva ikan karang. Tujuan dari penelitian ini adalah untuk mengkaji dinamika kelimpahan dan komposisi dari larva ikan di laguna Pulau Pari. Hasil penelitian menunjukkan bahwa kelimpahan larva ikan yang ditemukan berkisar antara 1,0 x103 – 14,7 x 103 individu/m3. Puncak kelimpahan tertinggi terjadi pada bulan Juli dan Oktober. Larva ikan ditemukan tersebar di semua lokasi pengamatan. Larva pada fase perkembangan pre flexion ditemukan dalam presentase yang paling tinggi. Selama masa pengamatan ditemukan 79 famili larva ikan yang didominasi oleh Pomacentridae, Aulostomidae, Blenniidae, Engraulidae dan Pinguipedidae. Dinamika yang terjadi pada larva ikan dapat dijadikan dasar bagi pengelolaan perikanan di wilayah Laguna Pulau Pari dengan cara memperluas daerah perlindungan laut dan rehabilitasi ekosistem Laguna Pulau Pari, sehingga peran dan fungsinya sebagai pemasok rekrut bagi stok ikan di perairan sekitarnya terjaga.   Fish Recruitment is, in turn, thought to be directly related to the survival of the early life stages in the spawning/nursery ground. Pulau Pari Laguna is considered as a spawning ground for many reef fishes. The aims of the research were to investigate the dynamic of abundance and composition of fish larvae in Pulau Pari lagune. The Results show, fish larvae abundance range between 1,0 x 103 – 14,7 x 103 ind/m3. Highest larval abundance occurred on July and October, which predicted as the month of fish larvae production seasons. Fish larvae were distributed in all part of the lagune. Larvae in the pre flexion stage found in the highest precentation compare to other. Totally 79 families of reef fish larvae were found during June – November 2010 dominated by Pomacentridae, Aulostomidae, Blenniidae, Engraulidae and Pinguipedidae.

  20. Potencial uso agrícola del agua de la laguna Unamuno. Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    V. Bohn

    2007-01-01

    Full Text Available La laguna Unamuno se localiza en el sudoeste de la provincia de Buenos Aires (Argentina y pertenece a la cuenca del arroyo Napostá Chico. Su origen se relaciona con la topografía y con el incremento de las precipitaciones promedio de la región durante las últimas décadas. Debido a que no existen experiencias de riego con agua de la laguna, el objetivo de este trabajo es determinar su aptitud para riego y el riesgo de sodificación del suelo de la cubeta de inundación. El grado de dicho riesgo es un aporte al conocimiento del estado actual de los suelos de la cubeta de inundación y es un parámetro a tener en cuenta en futuros planes de manejo para el uso de la laguna en suelos aledaños. Los parámetros físicos y químicos del agua se obtuvieron a partir del análisis de muestras correspondientes al período abril/04-junio/05. Se aplicó el índice de absorción de sodio y el de carbonato sódico residual. Se determinó que existe un alto riesgo de sodificación de los suelos que están en contacto con el agua de la laguna. Sin embargo, la permanencia de los mismos y la variación areal de la laguna contrarrestaron los efectos de la permanencia de agua con alto contenido de sodio(Na, cloro y sulfatos sobre tierras productivas.

  1. El registro de la pequena edad de hielo en lagunas pampeanas

    Directory of Open Access Journals (Sweden)

    Cecilia Laprida

    2009-12-01

    Full Text Available Se conoce como Pequeña Edad de Hielo (LIA al episodio acontecido entre el siglo 16 y mediados del siglo 19, durante el cual el clima en Europa se tornó frío y ocasionalmente tormentoso. En ciertas partes de Europa, las observaciones instrumentales lo abarcan parcialmente, pero para Sudamérica no se dispone de registros instrumentales contemporáneos a dicho evento. Con el objetivo de obtener nuevas evidencias para el período comprendido por la Pequeña Edad de Hielo en la llanura pampeana, se analizaron testigos cortos de la laguna de Chascomús y de la laguna del Monte los que, de acuerdo a dataciones AMS, abarcan los últimos 500 años. Ambos testigos constan de tres secuencias granodecrecientes. El análisis del registro de la laguna de Chascomús ha permitido reconocer un período benigno desde fines del siglo 15 hasta alrededor del 1700, cuando se evidencia una retracción de la laguna que inaugura un período seco. Este episodio habría continuado por casi 150 años y se revierte alrededor de 1850, momento a partir del cual los eventos de excesos hídricos comenzaron a dominar el escenario pampeano. La base del testigo de la laguna de Monte fue datada en 1441-1494 AD. Si bien el modelo de edades para este testigo aún no ha podido ser bien establecido, los eventos de Chascomús y Monte podrían ser correlacionables y expresar tendencias seculares regionales de la humedad.

  2. Nuevas evidencias geofísicas de la existencia de una caldera cubierta en laguna Pozuelos: Puna norte New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos: Northern Puna

    Directory of Open Access Journals (Sweden)

    Claudia B Prezzi

    2010-03-01

    Norte.In the southern border of Laguna de Pozuelos Basin, the Pan de Azúcar volcanic complex crops out. It consists of several dacitic volcanic dome centers of ~ 12 Ma. Previous interpretation of seismic lines and a detailed ground magnetic survey indicated the presence of buried intrusive bodies. The determination of the existence of buried bodies has two major implications: 1 these volcanic complexes are closely associated with ore deposits (as part of the Bolivian tin ore polymetallic belt; and 2 the existence of a large ancient caldera (~12 Ma beneath the central and southern part of the Laguna de Pozuelos Basin, covered by the infilling sediments was previously suggested. The volcanic complexes would represent the final stages of such a calderic magmatic system. In order to confirm the existence of other buried intrusives and/or a buried caldera system, detailed ground magnetic and gravity surveys were carried out. The magnetic map is dominated by positive and negative anomalies in the southern sector of the basin, associated with the dacitic domes. The residual Bouguer anomaly presents a semicircular pattern, having only positive values. We applied the curvature technique to analyse the magnetic and gravity signals and used Euler deconvolution to estimate the depth to the sources. Our results would support the hypothesis of a large caldera buried beneath the Laguna de Pozuelos Basin. The identification of such a large Middle Miocene caldera would bring new insight into the magmatic evolution of the northern Puna.

  3. Deep Drilling at Laguna Potrok Aike, Argentina: Recovery of a Paleoclimate Record for the Last Glacial from the Southern Hemisphere

    Science.gov (United States)

    Zolitschka, B.; Anselmetti, F.; Ariztegui, D.; Corbella, H.; Francus, P.; Gebhardt, C.; Hahn, A.; Kliem, P.; Lücke, A.; Ohlendorf, C.; Schäbitz, F.

    2009-12-01

    Laguna Potrok Aike, located in the South-Patagonian province of Santa Cruz (52°58’S, 70°23’W), was formed 770 ka ago by a volcanic (maar) eruption. Within the framework of the ICDP-funded project PASADO two sites were drilled from September to November 2008 using the GLAD800 drilling platform. A total of 513 m of lacustrine sediments were recovered from the central deep basin by an international team. The sediments hold a unique record of paleoclimatic and paleoecological variability from a region sensitive to variations in southern hemispheric wind and pressure systems and thus significant for the understanding of the global climate system. Moreover, Laguna Potrok Aike is close to many active volcanoes allowing a better understanding of the history of volcanism in the Pali Aike Volcanic Field and in the nearby Andean mountain chain. These challenging scientific themes need to be tackled in a global context as both are of increasing socio-economic relevance. On-site core logging based on magnetic susceptibility data documents an excellent correlation between the quadruplicate holes drilled at Site 1 and between the triplicate holes recovered from Site 2. Also, correlation between both sites located 700 m apart from each other is feasible. After splitting the cores in the lab, a reference profile was established down to a composite depth of 107 m for the replicate cores from Site 2. Sediments consist of laminated and sand-layered lacustrine silts with an increasing number of turbidites and homogenites with depth. Below 80 m composite depth two mass movement deposits (10 m and 5 m in thickness) are recorded. These deposits show tilted and distorted layers as well as nodules of fine grained sediments and randomly distributed gravel. Such features indicate an increased slump activity probably related to lake level fluctuations or seismicity. Also with depth coarse gravel layers are present and point to changes in hydrological conditions in the catchment area

  4. STATUS TERKINI DAN ALTERNATIF PENGELOLAAN SUMBER DAYA IKAN DI LAGUNA SEGARAANAKAN, CILACAP

    Directory of Open Access Journals (Sweden)

    Didik Wahyu Hendro Tjahjo

    2013-05-01

    Full Text Available Laguna Segara Anakan mempunyai peran penting sebagai kawasan pengelolaan perikanan udang sebagai daerah asuhan. Penyempitan dan pendangkalan perairan laguna sangat mempengaruhi populasi larva dan juvenil udang. Tujuan penulisan ini adalah untuk mengkaji hubungan perubahan lingkungan terhadap sumberdaya udang. Kandungan oksigen terlarut relatif rendah, kondisi tersebut dalam jangka panjang akan berpengaruh terhadap laju pertumbuhan ikan dan udang, dan akhirnya berdampak langsung terhadap laju rekruitmen udang dan ikan untuk perairan Segara Anakan dan perairan laut sekitar Cilacap. Kelimpahan larva udang dan ikan di perairan laguna ini berkisar antara 87 – 63,451 ind./1000 m3, dan kelimpahan juvenil tersebut berkisar antara 0 – 25,263 ind./1000 m2, dimana selama pengamatan didominasi oleh juvenil udang. Total produksi (ikan dan udang di Segara Anakan dari tahun ke tahun mengalami penurunan yang signifikan dalam periode tahun 1987-2004. Kondisi tersebut disebabkan luas perairan laguna semakin sempit dan dangkal, serta intensitas penangkapan semakin tinggi. Oleh karena itu, perlu suatu pengelolaan yang menyeluruh terhadap sumber daya laguna agar mampu mengurangi laju penurunan produksinya, yaitu pengelolaan sumberdaya perikanan di laguna Segara Anakan sebagai satu kesatuan ekologi yang utuh. Segara Anakan lagoon have an important role as the shrimp fishery management area in which shrimp species using this area of lagoons as a nursery ground. Refinement and siltation of the lagoon waters greatly affect populations of larvae and juvenile shrimp. The purpose of this paper is to study the relationship of environmental change on shrimp resources. Dissolved oxygen is relatively low, the condition will affect the growth of fish and shrimp in the long time, and ultimately it have a direct impact on the rate of recruitment of shrimp and fish for Segara Anakan waters and coastal waters around Cilacap. Abundance of larval shrimp and fish in this lagoon

  5. Origen de los manantiales de la Costa Verde

    OpenAIRE

    Rojas, Rubén; Montoya, Modesto; Mamani, Enoc; Montoya, Eduardo; Baltuano, Oscar; Maguiña, José; Bedregal, Patricia; Coria, Lucy; Guerra, Alcides; Justo, Santiago; Churasacari, Tania

    2014-01-01

    Este trabajo trata de determinar el origen los manantiales de la playa Costa Verde, situada en los distritos de Barranco, Miraflores y Magdalena de la provincia de Lima, Perú. Esos manantiales, cerca y a nivel del mar, sobreviven al proceso de urbanización de los terrenos de cultivo, iniciado en la década de los años 70, el que mermó el nivel freático del acuífero de Lima e hizo desaparecer las filtraciones de agua en los acantilados. Para identificar el origen se ha efectuado análisis isotóp...

  6. Spatial modulation of the hydrological risk at Praia, Cape Verde

    Science.gov (United States)

    Lino Silva, José; Neves, Ana Cristina; Garrott Marques Negreiros, João

    2016-06-01

    Hydrology modeling became a relevant topic for the Cidade da Praia, Cabo Verde, Africa, due to negative impact risk to local population and its assets. The modeling via Geographical Information Systems (GIS) can help the decision-making process of space occupation and characterization for this type of risk. Under the municipalities of Praia, the phenomenon of flash flood is common, causing soil erosion and landslide. This constitutes a risk for the local habitat, particularly in districts with a lack of strong human infrastructures. To simulate, analyze and generate risk maps using GIS to help this county governance authorities for decision-making, thus, becomes the main aim of this article.

  7. La química verde y el desarrollo sustentable

    OpenAIRE

    Angélica Sierra; Lidia Meléndez; Armando Ramírez-Monroy; Maribel Arroyo

    2014-01-01

    La química es indispensable para asegurar que las siguientes generaciones de productos químicos, materiales y energía sean sustentables. La química es también esencial para limpiar el planeta de contaminantes ya existentes. En este artículo se presenta una breve revisión del desarrollo de la Química Verde, enfatizando sus principios, así como citando ejemplos específicos de compuestos usados en procesos no contaminantes sustentables y de apoyos otorgados para motivar el desarrollo de pr...

  8. ¿Qué tan verde es tu mercado?

    OpenAIRE

    Wilmar R. Olaya-González; Luz Adriana Gómez-Rodríguez

    2011-01-01

    El mercado de lo verde y lo ecológico es una tendencia indiscutible en nuestro mundo globalizado, que busca de alguna manera resarcir el daño infringido sobre el medio ambiente. Más allá de simple altruismo, la ecología se ha convertido en una moda, de la cual unos y otros toman ventaja a su mejor acomodo, haciendo del mercado de productos y servicios su tribuna; eco-diseño, planes de responsabilidad social y ambiental, campañas por el reciclaje y consumo de productos "más amigables" con el m...

  9. REGISTROS NUEVOS O POCO CONOCIDOS DE AVES MIGRATORIAS EN LA LAGUNA DEL OTÚN, PARQUE NACIONAL NATURAL LOS NEVADOS, RISARALDA, COLOMBIA Records of New or Poorly Known Migratory Birds from Laguna del Otún, los Nevados National Natural Park, Risaralda, Colombia

    Directory of Open Access Journals (Sweden)

    ORLANDO ACEVEDO-CHARRY

    2013-04-01

    Full Text Available Colombia es un sitio importante para las aves migratorias. Sin embargo, aún falta mucho conocimiento de dónde estas se encuentran durante su paso o permanencia por el país y cuáles utilizan los páramos. Registramos nuevas especies de aves migratorias para la laguna del Otún, inmersa en un complejo de humedales declarados sitio Ramsar desde el 2008. La laguna está localizada en el Parque Nacional Natural Los Nevados a 3932 msnm, en ecosistema de páramo, en la Cordillera Central de los Andes de Colombia. Durante cinco salidas entre 2010 y 2012 se registraron cuatro nuevas especies de aves migratorias para el parque: Anas acuta, Pandion haliaetus, Riparia riparia y Dendroica petechia. Adicionalmente, se registró una ampliación del rango altitudinal para dos especies migratorias que solo habían sido registradas en la región a menos de 3500 msnm: Tringa flavipes e Hirundo rustica. Estas observaciones sugieren que dichas especies podrían tolerar condiciones de alta montaña y utilizar el páramo. Es necesario estudiar a fondo las dinámicas migratorias y el uso de hábitat de alta montaña por las aves migratorias.

  10. Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre, Texas.

    Science.gov (United States)

    Custer, T W; Mitchell, C A

    1993-05-01

    Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic, mercury, selenium, lead, cadmium, and organochlorines were generally at background concentrations throughout the lower Laguna Madre. Nickel and chromium concentrations were exceptionally high in shrimp and pinfish (Lagodon rhomboides), which is difficult to explain because of no known anthropogenic sources for these trace elements. For sediment and blue crabs (Callinectes sapidus), mercury was highest near agricultural drainages. Also, DDE was more frequently detected in blue crabs near agricultural drainages than farther away. In contrast, selenium concentrations did not differ among collecting sites and arsenic concentrations were lowest in shoalgrass, blue crabs, and brown shrimp (Penaeus aztecus) near agricultural drainages.

  11. Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre

    Science.gov (United States)

    Custer, T.W.; Mitchell, C.A.

    1993-01-01

    Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic, mercury, selenium, lead, cadmium, and organochlorines were generally at background concentrations throughout the lower Laguna Madre. Nickel and chromium concentrations were exceptionally high in shrimp and pinfish (Lagodon rhomboides), which is difficult to explain because of no known anthropogenic sources for these trace elements. For sediment and blue crabs (Callinectes sapidus), mercury was highest near agricultural drainages. Also, DDE was more frequently detected in blue crabs near agricultural drainages than farther away. In contrast, selenium concentrations did not differ among collecting sites and arsenic concentrations were lowest in shoalgrass, blue crabs, and brown shrimp (Penaeus aztecus) near agricultural drainages.

  12. ¿Qué tan verde es tu mercado?

    Directory of Open Access Journals (Sweden)

    Wilmar R. Olaya-González

    2011-01-01

    Full Text Available El mercado de lo verde y lo ecológico es una tendencia indiscutible en nuestro mundo globalizado, que busca de alguna manera resarcir el daño infringido sobre el medio ambiente. Más allá de simple altruismo, la ecología se ha convertido en una moda, de la cual unos y otros toman ventaja a su mejor acomodo, haciendo del mercado de productos y servicios su tribuna; eco-diseño, planes de responsabilidad social y ambiental, campañas por el reciclaje y consumo de productos "más amigables" con el medio ambiente hacen parte del panorama que se intenta describir en esta reseña. Por medio de un estudio de caso, se hará énfasis en cómo la comunicación asume un papel crucial en la verdadera apropiación del concepto de "consumidor verde" y "consumidor responsable", de manera que la propuesta transversal de las tic se convierta en una herramienta no solo tecnológica, sino también de empoderamiento del papel que la sociedad puede representar en el cuidado de los recursos naturales.

  13. Design Options of a High-power Synchrotron for Laguna-LBNO

    CERN Document Server

    Papaphilippou, Y; Alekou, A; Antoniou, F; Benedikt, M; Efthymiopoulos, I; Garoby, R; Gerigk, F; Goddard, B; Lazaridis, C; Parfenova, A; Shaposhnikova, E; Steerenberg, R

    2013-01-01

    Design studies have been initiated at CERN, exploring the prospects of future high-power proton beams for producing neutrinos, within the LAGUNA-LBNO project. These studies include the design of a 2 MW high-power proton synchrotron (HP-PS) using the LP-SPL as injector. This paper resumes the design options under study in order to reach this high power, and their implications regarding layout, magnet technology, beam loss control and RF considerations

  14. Persistent organic pollutants in sediment cores of Laguna El Yucateco, Tabasco, Southeastern Gulf of Mexico

    OpenAIRE

    Guadalupe Ponce-Vélez; Alfonso Vázquez Botello; Gilberto Díaz-González; Claudia García-Ruelas

    2012-01-01

    Information is presented on the content of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in sediment cores collected in the coastal ecosystem of Laguna El Yucateco, located in the tropical southeastern Gulf of Mexico. The ecosystem lies in a region where the human population is socially and economically limited, and it is subjected to great environmental pressure derived mainly from the oil industry. The vertical profiles data s...

  15. Subsidence and Extension Rates of Laguna Salada Basin, Northeastern Baja California, Mexico

    Science.gov (United States)

    Contreras, J.; Martin-Barajas, A.; Herguera, J. C.

    2002-12-01

    Laguna Salada basin in northeastern Baja California, Mexico, is an active half-graben product of the trans-tensional tectonics of the Gulf of California. It lies at the boundary between the North America and Pacific plates, 15 km west of the Cerro Prieto-Imperial fault system. We present the results of a time series analysis of the uppermost 980 m of a gamma ray log from the geothermal exploratory well ELS1 drilled in the proximity of the Laguna Salada fault, which bounds the basin on its eastern margin. Our analysis indicates its stratigraphy is cyclical and that the spectrum of the gamma ray log is similar to the spectrum of δ18O Pleistocene variations, which strongly suggest an orbital origin. Based on this, we establish a correlation between the gamma ray log and δ18O stages to constrain ages of sediments with an estimated uncertainty of ~10 kyr. We found that sedimentation rates at ELS1 site have remained constant during the last 780 kyr. The sedimentation rate at the ELS1 site is 1.6 mm/yr. This value is extrapolated to obtain the vertical and perpendicular to strike slip rates of Laguna Salada fault. It was found that the vertical slip component is 4.22 mm/yr and the perpendicular to strike slip component (E-W direction) is 1.55 mm/yr.

  16. Calidad y aprovechamiento del agua de la Laguna Unamuno (Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Vanesa Yael Bohn

    2004-01-01

    Full Text Available Una de las características más destacadas de la geomorfología de la provincia de Buenos Aires es la presencia de un número muy grande de lagunas, de tamaños y formas diversas, con una distribución aparentemente caótica. Muchas de ellas han ocupado tierras potencialmente productivas. La laguna Unamuno se halla localizada en la cuenca del arroyo Napostá Chico (1320 km2, en la región pampeana argentina. El objetivo del trabajo es el estudio de la calidad del agua de la laguna y el análisis de las posibilidades de aprovechamiento del recurso hídrico. Se recopilaron datos edafológicos y meteorológicos, se midieron parámetros físicos y se analizaron muestras de agua en superfi cie y profundidad. La calidad del agua es evaluada desde las perspectivas biológica, química y física.

  17. The role of eclogite in the mantle heterogeneity at Cape Verde

    DEFF Research Database (Denmark)

    Barker, Abigail Katrine; Holm, Paul Martin; Troll, Valentin R.

    2014-01-01

    have been limited. We apply the minor elements in olivine approach (Sobolev et al. in Nature 434:590–597, 2005; Science, doi:10.1126/science.1138113, 2007), to determine and quantify the contributions of peridotite, pyroxenite and eclogite melts to the mantle heterogeneity observed at Cape Verde. Cores...... of olivine phenocrysts of the Cape Verde volcanics have low Mn/FeO and low Ni*FeO/MgO that deviate from the negative trend of the global array. The global array is defined by mixing between peridotite and pyroxenite, whereas the Cape Verde volcanics indicate contribution of an additional eclogite source...

  18. Subsidence of the Laguna Salada Basin, northeastern Baja California, Mexico, inferred from Milankovitch climatic changes

    Energy Technology Data Exchange (ETDEWEB)

    Contreras, Juan; Martin-Barajas, Arturo [Departamento de Geologia, CICESE, Ensenada Baja California (Mexico); Herguera, Juan Carlos [Division de Oceanologia, CICESE, Ensenada Baja California (Mexico)

    2005-01-15

    Laguna Salada in northern Baja California, Mexico, is an active half-graben product of the trans-tensional tectonics of the Gulf of California. It is sensitive to changes in sediment supply from the Colorado River basin. We present a time series analysis of the upper 980 m of a gamma-ray log from a borehole drilled near the Laguna Salada fault. The power spectrum of the gammaray log resembles the spectrum of {delta}{sup 1}8{omicron} Pleistocene isotopic variations from ice cores and from the deep ocean, known to be strongly controlled by Milankovitch cycles. We correlate {delta}{sup 1}8{omicron} stages with silty and sandy intervals in the log. Downcore ages for the last 780 ky are constrained within {approx}10 kyr. We derive a simple time vs. depth calibration relation for the basin over this time interval. Estimated sedimentation rates at the drill site appear to be constant with a value of {approx}1.6 mm/yr. We propose that this subsidence rate is produced by the Laguna Salada fault. [Spanish] La cuenca de Laguna Salada en el norte de Baja California, Mexico, es un semigraben activo producto de la tectonica ranstensional del Golfo de California. Esta cuenca endorreica es sensible a cambios en sedimentacion por variaciones en el aporte e sedimentos de fuentes cercanas y distales transportados por arroyos de las sierras adyacentes y por el Rio Colorado. Esta cuenca es un sitio excepcional para explorar el uso de cambios climaticos ciclicos como herramienta de datacion y estimar tasas de sedimentacion y subsidencia en el area. Para demostrar esto se presenta un analisis de series de tiempo de un registro de rayos de gama de un pozo geotermico exploratorio perforado adyacente a la falla de Laguna Salada, la cual limita el margen oriental de la cuenca. Los resultados del analisis indican que el espectro de los primeros 980 m del registro de rayos gama tiene una alta coherencia con el espectro de registros isotopicos paleoclimaticos de {delta}{sup 1}8{omicron} del

  19. Geología ambiental de la laguna de las Perdices, Monte, Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Nauris Dangavs

    2010-09-01

    Full Text Available El estudio de la laguna de las Perdices abarca tres aspectos: el geolimnológico, el geoambiental y el de remediación. El primero ha consistido en caracterizar el medio físico de un ambiente léntico típico de la Pampasia meridional prácticamente desconocido. El segundo, la evaluación del grado de deterioro natural y la contaminación físico-química y bacteriológica. El tercero propicia las medidas para su recuperación, máxime teniendo en cuenta que el Municipio de Monte pretende transformarla en Reserva Natural. Esta laguna de 11.50 km2, situada en el noreste bonaerense, pertenece a la cuenca de las Lagunas Encadenadas de Monte y fue evaluada con metodología geolimnológica, en base a cartografía, fotografía aérea e imágenes satelitales, nivelaciones, batimetría, freatimetría, perforaciones, muestreo de sedimentos, suelos y aguas. A tal efecto se caracterizaron los aspectos fisiográficos, geomorfológicos, geológicos e hidrológicos de la región y de la laguna. En la cubeta lagunar se estudiaron los depósitos colmatantes, integrados por siete unidades estratigráficas, de las cuales la de mayor interés corresponde a los depósitos actuales, indicadores directos del estado de degradación del ambiente. El régimen hidrológico de la laguna se estableció caracterizando las precipitaciones sobre la superficie lagunar, la evaporación, el escurrimiento superficial y freático, la freatimetría, la interrelación del cuerpo de agua con el agua subterránea, el balance hídrico anual y la dinámica acuática. Las aguas fueron evaluadas en los aspectos físico-químicos, estableciéndose su composición iónica y tipificación química según Maucha y la clasificación limnológica del ambiente acuático. Las determinaciones en agua y sedimentos confirmaron la severa contaminación físico-química y bacteriológica, incompatible con la vida acuática y el uso recreativo, de acuerdo a la normativa vigente. Dicha contaminaci

  20. Availability of ground water in parts of the Acoma and Laguna Indian Reservations, New Mexico

    Science.gov (United States)

    Dinwiddie, George A.; Motts, Ward Sundt

    1964-01-01

    The need for additional water has increased in recent years on the Acoma and Laguna Indian Reservations in west-central New Mexico because the population and per capita use of water have increased; the tribes also desire water for light industry, for more modern schools, and to increase their irrigation program. Many wells have been drilled in the area, but most have been disappointing because of small yields and poor chemical quality of the water. The topography in the Acoma and Laguna Indian Reservations is controlled primarily by the regional and local dip of alternating beds of sandstone and shale and by the igneous complex of Mount Taylor. The entrenched alluvial valley along the Rio San Jose, which traverses the area, ranges in width from about 0.4 mile to about 2 miles. The climate is characterized by scant rainfall, which occurs mainly in summer, low relative humidity, and large daily fluctuations of temperature. Most of the surface water enters the area through the Rio San Jose. The average annual streamflow past the gaging station Rio San Jose near Grants, N. Mex. is about 4,000 acre-feet. Tributaries to the Rio San Jose within the area probably contribute about 1,000 acre-feet per year. At the present time, most of the surface water is used for irrigation. Ground water is obtained from consolidated sedimentary rocks that range in age from Triassic to Cretaceous, and from unconsolidated alluvium of Quaternary age. The principal aquifers are the Dakota Sandstone, the Tres Hermanos Sandstone Member of the Mancos Shale, and the alluvium. The Dakota Sandstone yields 5 to 50 gpm (gallons per minute) of water to domestic and stock wells. The Tres Hermanos sandstone Member generally yields 5 to 20 gpm of water to domestic and stock wells. Locally, beds of sandstone in the Chinle and Morrison Formations, the Entrada Sandstone, and the Bluff Sandstone also yield small supplies of water to domestic and stock wells. The alluvium yields from 2 gpm to as much as 150

  1. Control of dengue disease: a case study in Cape Verde

    CERN Document Server

    Rodrigues, Helena Sofia; Torres, Delfim F M; Zinober, Alan

    2010-01-01

    A model for the transmission of dengue disease is presented. It consists of eight mutually-exclusive compartments representing the human and vector dynamics. It also includes a control parameter (adulticide spray) in order to combat the mosquito. The model presents three possible equilibria: two disease-free equilibria (DFE) --- where humans, with or without mosquitoes, live without the disease --- and another endemic equilibrium (EE). In the literature it has been proved that a DFE is locally asymptotically stable, whenever a certain epidemiological threshold, known as the basic reproduction number, is less than one. We show that if a minimum level of insecticide is applied, then it is possible to maintain the basic reproduction number below unity. A case study, using data of the outbreak that occured in 2009 in Cape Verde, is presented.

  2. Search for neutrino oscillations at the palo verde nuclear reactors

    Science.gov (United States)

    Boehm; Busenitz; Cook; Gratta; Henrikson; Kornis; Lawrence; Lee; McKinny; Miller; Novikov; Piepke; Ritchie; Tracy; Vogel; Wang; Wolf

    2000-04-24

    We report on the initial results from a measurement of the antineutrino flux and spectrum at a distance of about 800 m from the three reactors of the Palo Verde Nuclear Generating Station using a segmented gadolinium-loaded scintillation detector. We find that the antineutrino flux agrees with that predicted in the absence of oscillations excluding at 90% C.L. nu;(e)-nu;(x) oscillations with Deltam(2)>1.12x10(-3) eV(2) for maximal mixing and sin (2)2straight theta>0.21 for large Deltam(2). Our results support the conclusion that the atmospheric neutrino oscillations observed by Super-Kamiokande do not involve nu(e).

  3. (Lepus europaea capturadas en el Corredor Verde del Guadiamar

    Directory of Open Access Journals (Sweden)

    F. Carrascal Moreno

    2005-01-01

    Full Text Available Tras muestrear individuos de liebre en diversas zonas del Corredor Verde del Guadiamar, se procede a procesar muestras de tejidos de hígado y músculo para analizar sus contenidos en As, Cd, Pb, Cu y Zn, elementos químicos de especial significado ambiental, sobre todo en una zona de tradición minera, que además fue afectada por una catástrofe ambiental de gran magnitud por la rotura de una balsa de estériles (donde se acumulaban los restos del procesado del mineral con altas concentraciones de metales pesados en forma de lodos y aguas contaminadas, en abril del año 1998. Los resultados muestran una situación de mejora ambiental y de normalidad si se comparan con los valores encontrados en bibliografía especializada y los animales empleados como control.

  4. New Archaeological Evidence for an Early Human Presence at Monte Verde, Chile

    Science.gov (United States)

    Dillehay, Tom D.; Ocampo, Carlos; Saavedra, José; Sawakuchi, Andre Oliveira; Vega, Rodrigo M.; Pino, Mario; Collins, Michael B.; Scott Cummings, Linda; Arregui, Iván; Villagran, Ximena S.; Hartmann, Gelvam A.; Mella, Mauricio; González, Andrea; Dix, George

    2015-01-01

    Questions surrounding the chronology, place, and character of the initial human colonization of the Americas are a long-standing focus of debate. Interdisciplinary debate continues over the timing of entry, the rapidity and direction of dispersion, the variety of human responses to diverse habitats, the criteria for evaluating the validity of early sites, and the differences and similarities between colonization in North and South America. Despite recent advances in our understanding of these issues, archaeology still faces challenges in defining interdisciplinary research problems, assessing the reliability of the data, and applying new interpretative models. As the debates and challenges continue, new studies take place and previous research reexamined. Here we discuss recent exploratory excavation at and interdisciplinary data from the Monte Verde area in Chile to further our understanding of the first peopling of the Americas. New evidence of stone artifacts, faunal remains, and burned areas suggests discrete horizons of ephemeral human activity in a sandur plain setting radiocarbon and luminescence dated between at least ~18,500 and 14,500 cal BP. Based on multiple lines of evidence, including sedimentary proxies and artifact analysis, we present the probable anthropogenic origins and wider implications of this evidence. In a non-glacial cold climate environment of the south-central Andes, which is challenging for human occupation and for the preservation of hunter-gatherer sites, these horizons provide insight into an earlier context of late Pleistocene human behavior in northern Patagonia. PMID:26580202

  5. Estrategias de mercadeo verde utilizadas por empresas a nivel mundial

    Directory of Open Access Journals (Sweden)

    Castellano, Susie

    2015-09-01

    Full Text Available La preocupación por el medio ambiente se ha convertido en una temática que inquieta a toda la colectividad actual, desde los más pequeños hasta los más grandes, desde la pequeña empresa hasta la gran industria. Sumado a esto, el auge de normativas ambientales que establecen regulaciones al empresario, los obliga a tener una mayor conciencia de los daños que pueden causar sus acciones al medio ambiente. Es por esto, que paulatinamente ha comenzado, por parte de las empresas, la adopción de estrategias en el área de mercadeo verde que les permita comercializar sus productos y servicios de forma que los mismos sean ambientalmente compatibles. En el presente trabajo, se abordaron las diferentes estrategias que han venido asumiendo empresas de diferente índole para hacer frente a tan importante filosofía en el ámbito mundial. Para tal fin, se hizo la revisión y contrastación de artículos escritos en el marco del mercadeo verde por Rivera y Molero (2006, Chamorro (2001, Samper y Echeverri (2008 principalmente, encontrándose que cada vez son más las empresas que se suman a esta forma de mercadear sus procesos y productos y más los consumidores que anteponen criterios ecológicos ante variables de otra índole, modificando sus hábitos de consumo.

  6. Governança ambiental e economia verde

    Directory of Open Access Journals (Sweden)

    Pedro Roberto Jacobi

    Full Text Available A Conferência Rio+20 mobiliza a comunidade global em 2012 para participar de um desafiador debate sobre a realidade ambiental global e modus operandi existente quanto à temática ampla e genérica do desenvolvimento e do ambiente. Um dos temas estruturantes desta reunião é a transição para uma economia verde no contexto do desenvolvimento sustentável e da erradicação da pobreza. O tema da Governança Ambiental Global um dos carros chefe do debate na Rio+20, no intuito de promover e acelerar a transição rumo a sociedades sustentáveis, configura a construção muitas vezes, de forma controversa, das condições para a definição de novos espaços institucionais e processos decisórios compartilhados. Este artigo propõe aos leitores uma reflexão para discutir que tipo de sustentabilidade está por trás da economia verde, a sua aplicabilidade e o que deva ser priorizada na discussão de governança ambiental. Isto se explica na medida em que existe a necessidade de mudar os mecanismos de utilização dos recursos, profundamente injustos, e que impedem avanços nos processos decisórios, pois as decisões de poucos tem configurado uma lógica perversa de expropriação de recursos naturais e não resolução da exclusão social.

  7. Field Plot Points for Mesa Verde National Park Vegetation Mapping Project

    Data.gov (United States)

    National Park Service, Department of the Interior — The Mesa Verde National Park Classification Releve Location zip shapefile (meveplot.zip) was developed as a Geographic Information Systems (GIS) product to represent...

  8. Graphical representations of data from sediment cores collected in 2009 offshore from Palos Verdes, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of the data release includes graphical representation (figures) of data from sediment cores collected in 2009 offshore of Palos Verdes, California. This...

  9. Raw computed tomography (CT) images of sediment cores collected in 2009 offshore from Palos Verdes, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of the data release includes raw computed tomography (CT) images of sediment cores collected in 2009 offshore of Palos Verdes, California. It is one of...

  10. Contaminación producida por piscicultura intensiva en lagunas andinas de Junín, Perú

    Directory of Open Access Journals (Sweden)

    Mauro Mariano

    2011-05-01

    Full Text Available Se reportan los cambios producidos por el cultivo intensivo de la trucha Oncorhynchus mykiss en siete lagunas andinas. Las observaciones se realizaron en el año 1996, y entre el 2002 - 2007 y permitieron observar el proceso de deterioro de las lagunas, caracterizado por el incremento en las concentraciones de fosforo total y la disminución del oxigeno disuelto y la transparencia. La comunidad béntica fue evaluada en las siete lagunas en el 2007, resultando el número de especies y los índices de diversidad bajos (H'<1,26; <8 spp.. La abundancia varió entre 7 y 35 ind./0,04m2. La materia orgánica y carbonatos en fondo fueron altos (30,22 - 42,45%.

  11. Niebla ceruchis from Laguna Figueroa: dimorphic spore morphology and secondary compounds localized in pycnidia and apothecia.

    Science.gov (United States)

    Enzien, M; Margulis, L

    1988-01-01

    During and after the floods of 1979-80 Niebla ceruchis growing epiphytically on Lycium brevipes was one of the dominant aspects of the vegetation in the coastal dunal complex bordering the microbial mats at Laguna Figueroa, Baja California Norte, Mexico. The lichen on denuded branches of Lycium was far more extensively distributed than Lycium lacking lichen. Unusual traits of this Niebla ceruchis strain, namely localization of lichen compounds in the mycobiont reproductive structures (pycnidia and apothecia) and simultaneous presence of bilocular and quadrilocular ascospores, are reported. The abundance of this coastal lichen cover at the microbial mat site has persisted through April 1988.

  12. Bentos asociado al pastizal de Halodule (Potamogetonaceae) en Laguna de La Mancha, Veracruz, México

    OpenAIRE

    Reyes-Barragán, Ma del Pilar; Salazar-Vallejo, Sergio I.

    2016-01-01

    Se realizó un estudio puntual sobre la fauna asociada al pastizal de Halodule wrightii beaude t t eí en la Laguna de La Mancha, Veracruz, México, durante febrero, marzo, abril, junio, agosto, octubre, noviembre y diciembre de 1983 y febrero de 1984. Se pretendió detenninar la composición de la fauna béntica asociada al pasto y su variación estacional. Se efectuaron recolectas de material biológico y registros de parámetros ambientales (saliniudad, temperatura, profundidad del agua). La salini...

  13. Rock Magnetic Properties of Laguna Carmen (Tierra del Fuego, Argentina): Implications for Paleomagnetic Reconstruction

    Science.gov (United States)

    Gogorza, C. G.; Orgeira, M. J.; Ponce, F.; Fernández, M.; Laprida, C.; Coronato, A.

    2013-05-01

    We report preliminary results obtained from a multi-proxy analysis including paleomagnetic and rock-magnetic studies of two sediment cores of Laguna Carmen (53°40'60" S 68°19'0" W, ~83m asl) in the semiarid steppe in northern Tierra del Fuego island, Southernmost Patagonia, Argentina. Two short cores (115 cm) were sampled using a Livingstone piston corer during the 2011 southern fall. Sediments are massive green clays (115 to 70 cm depth) with irregularly spaced thin sandy strata and lens. Massive yellow clay with thin sandy strata continues up to 30 cm depth; from here up to 10 cm yellow massive clays domain. The topmost 10 cm are mixed yellow and green clays with fine sand. Measurements of intensity and directions of Natural Remanent Magnetization (NRM), magnetic susceptibility, isothermal remanent magnetization, saturation isothermal remanent magnetization (SIRM), back field and anhysteretic remanent magnetization at 100 mT (ARM100mT) were performed and several associated parameters calculated (ARM100mT/k and SIRM/ ARM100mT). Also, as a first estimate of relative magnetic grain-size variations, the median destructive field of the NRM (MDFNRM), was determined. Additionally, we present results of magnetic parameters measured with vibrating sample magnetometer (VSM). The stability of the NRM was analyzed by alternating field demagnetization. The magnetic properties have shown variable values, showing changes in both grain size and concentration of magnetic minerals. It was found that the main carrier of remanence is magnetite with the presence of hematite in very low percentages. This is the first paleomagnetic study performed in lakes located in the northern, semiarid fuegian steppe, where humid-dry cycles have been interpreted all along the Holocene from an aeolian paleosoil sequence (Orgeira et el, 2012). Comparison between paleomagnetic records of Laguna Carmen and results obtained in earlier studies carried out at Laguna Potrok Aike (Gogorza et al., 2012

  14. Relevamiento de la ictiofauna de la laguna Camba Cué, isla Apipé Grande, Corrientes, Argentina Ichthyological survey of the Camba Cué lagoon, Apipé Grande Island, Corrientes, Argentina

    Directory of Open Access Journals (Sweden)

    Juan M. Iwaszkiw

    2010-06-01

    Full Text Available La isla Apipé Grande se encuentra a la altura del kilómetro 1400 del río Paraná, dos kilómetros aguas abajo de la represa Yacyretá y actualmente constituye la Reserva Provincial Isla Apipé Grande. Esta isla se destaca por poseer cerca del 70% de la superficie compuesta por zonas bajas e inundables integradas por madrejones, esteros y lagunas. En la zona central de la isla se encuentran las lagunas Hermosa y Cambá Cué que cubren un área aproximada de 300 y 1000 hectáreas respectivamente. En el presente trabajo se informan los resultados del primer relevamiento ictiológico de los referidos cuerpos de agua. La toma de muestras realizada en la laguna Cambá Cué permitió identificar 55 especies de peces. La presencia de especies características de ambientes tanto lóticos como leníticos es interpretada como evidencia de la estrecha relación hidrológica entre estos cuerpos de agua y el sistema del río Paraná.The Apipé Grande island is a Provincial Reserve located in the Paraná river at 1400 km, from its origin at the Buenos Aires harbor, and two km downstream of the Yacyretá Dam. The outstanding feature of the island is that 70% of its area is composed of wetland. At the center of the island there are Hermosa and Cambá Cué «lagunas» with 300 and 1000 hectares respectively. The present paper reports the results of the first ichthyological survey to these water bodies. As a result of the sampling fieldwork 55 fish species were identified. The presence of species belonging to lotic and lenitic environments is interpreted as evidence for the close hydrological relationship of these water bodies and the Paraná river system.

  15. Chuva de sementes em remanescentes florestais de Campo Verde, MT

    Directory of Open Access Journals (Sweden)

    William Pietro-Souza

    2014-08-01

    Full Text Available O objetivo deste trabalho consistiu em avaliar sazonalmente a produção de sementes provenientes de fragmentos florestais presentes na zona rural de Campo Verde, MT. Essa caracterização ocorreu em termos de produção de sementes e riqueza de espécies vegetais. Foram selecionados três fragmentos florestais caracterizados como Floresta Estacional Semidecidual. Em cada fragmento, cinco coletores foram instalados e confeccionados com canos de PVC (1 m²; malha de náilon de 0,001 m e 0,15 m de profundidade do bojo. O material foi coletado mensalmente, cujas sementes foram quantificadas e separadas conforme a síndrome de dispersão, etapa sucessional e forma de vida. Houve a determinação da densidade, frequência absoluta, índice de diversidade e equitabilidade. Ao todo, foram obtidas 3.622 sementes, pertencentes a 74 táxons. Maiores densidades de sementes foram observadas durante os meses de setembro, outubro e novembro. As lianas Gouania sp., Fridericia speciosa, Heteropterys sp. e Distictella sp. responderam com 55,95% do total de sementes aportadas. Das espécies que compuseram a chuva de sementes, 74% não são dispersas pelo vento. Todavia, quando se verificou a quantidade de diásporos coletados, formas dispersas pelo vento foram predominantes, representando 76% do total. Citam-se como táxons arbóreos importantes para a recomposição florestal na região de Campo Verde, situada no Sudeste de Mato Grosso: Tachigali rubiginosa, Siparuna guianensis, Nectandra sp., Cordia alliodora, Alibertia sp., Terminalia brasiliensis e Myrcia sp. Essas espécies devem ser alvo de estudos mais específicos relacionados ao seu potencial para recuperação de ambientes degradados, considerando-se as Áreas de Preservação Permanente e Reservas Legais.

  16. Estructura y composición florística de la vegetación del Parque Educativo Laguna Bélgica, Chiapas, México Structure and floristic composition of vegetation on Parque Educativo Laguna Bélgica, Chiapas, Mexico

    Directory of Open Access Journals (Sweden)

    Ma. Consuelo Escobar-Ocampo

    2007-12-01

    Full Text Available El estudio se realizó en el Parque Educativo Laguna Bélgica (PELB. El objetivo fue el de caracterizar las asociaciones vegetales para sentar las bases para su manejo y conservación. El mapa de vegetación se realizó con la interpretación de ortofotos, verificaciones de campo y un Sistema de Información geográfica. La caracterización de la vegetación y los inventarios de flora leñosa se elaboraron según el método de Mueller-Dombois y Ellenberg. Se censaron todas las leñosas con altura > 1 m y diámetro a la altura del pecho > 3 cm. La cobertura se evaluó cualitativamente. Se reconocieron 5 asociaciones vegetales: encinar de Quercus oleoides, encinar de Q. elliptica, acahual arbóreo, pastizal y asociación secundaria de herbáceas. En la zona de estudio se colectaron 159 especies, las cuales se complementaron mediante revisión bibliográfica obteniéndose un total de 254 especies, comprendidas en 157 géneros y 64 familias. Se aportan 68 nuevos registros para el PELB. La flora de Laguna Bélgica presenta una mayor afinidad florística con los bosques húmedos de la vertiente del golfo que con los de la depresión central. Se resalta la alta diversidad florística y la importancia por conservar y manejar este relicto de vegetación.The study was conducted in the Parque Educativo Laguna Bélgica (PELB. The objective was to characterize the vegetal associations to establish basis for management. The vegetation map was elaborated on interpretation of ortophotos, supported with field verification and processed using a GIS. The characterization of the vegetation used the method of Mueller-Dombois and Ellenberg. For forest inventories we registered woody species > 1 m height and > 3 cm diameter breast height. The coverage was evaluated in qualitative form based on Braun-Blanquet method. Five types of vegetal associations were recognized: oak forest of Quercus oleoides, oak forest of Q. elliptica, tree-secondary vegetation, grasslands, and

  17. PASADO - ICDP Deep Drilling at Laguna Potrok Aike (Argentina): A 50 ka Record of Increasing Environmental Dynamics

    Science.gov (United States)

    Zolitschka, Bernd; Anselmetti, Flavio; Ariztegui, Daniel; Francus, Pierre; Gebhardt, Catalina; Kliem, Annette Hahn Pierre; Lücke, Andreas; Ohlendorf, Christian; Schäbitz, Frank; Wastegard, Stefan

    2010-05-01

    Laguna Potrok Aike, located in the South-Patagonian province of Santa Cruz (52°58'S, 70°23'W), was formed by a volcanic (maar) eruption in the late Quaternary Pali Aike Volcanic Field several hundred thousand years ago. This archive holds a unique record of paleoclimatic and paleoecological variability from a region sensitive to variations in southern hemispheric wind and pressure systems, which provide a significant cornerstone for the understanding of the entire global climate system. Moreover, Laguna Potrok Aike is close to many active volcanoes allowing a better understanding of the history of volcanism in the Pali Aike Volcanic Field as well as in the Andean mountain chain, the latter located in a distance of less than 150 km to the west. Finally, Patagonia is the source region of eolian dust blown from the South American continent into the South Atlantic and onto the Antarctic ice sheet. The currently ongoing global climate change, the thread of volcanic hazards as well as of regional dust storms are of increasing socio-economic relevance and thus challenging scientific themes that are tackled for southernmost South America with an interdisciplinary research approach in the framework of the ICDP-funded "Potrok Aike Maar Lake Sediment Archive Drilling Project" (PASADO). Using the GLAD800 drilling platform seven holes were drilled in the southern spring of 2008. A total of 510 m of lacustrine sediments were recovered by an international scientific team from the central 100 m deep basin with an excellent core recovery rate of 94.4%. The reference profile with a composite depth of 106 m consists of undisturbed laminated and sand-layered lacustrine silts with an increasing number of coarse gravel layers, turbidites and homogenites with depth. Below 80 m composite depth two mass-movement deposits (10 m and 5 m in thickness) are recorded. These deposits show tilted and distorted layers as well as nodules of fine-grained sediments and randomly distributed gravel

  18. Organochlorines and trace elements in four colonial waterbird species nesting in the lower Laguna Madre, Texas.

    Science.gov (United States)

    Mora, M A

    1996-11-01

    Eggs from four aquatic bird species nesting on the National Audubon Sanctuary Islands of the lower Laguna Madre were collected during 1993 and 1994 to determine concentrations of organochlorine compounds and trace metals and to evaluate their possible detrimental effects on birds nesting in this aquatic ecosystem. The only chlorinated hydrocarbons found above detection limits were p,p'-DDE (DDE), p,p'-DDT (DDT), HCB, HCH, chlordane, and polychlorinated biphenyls (PCBs). Median DDE and PCB levels in eggs of four species were below 1 microgram/g ww. Concentrations of DDE were much greater (6-70 fold) than the concentrations of other chlorinated pesticides which were present at or near detection limits. One egg from a snowy egret contained 9.65 micrograms/g DDE, 0.056 microgram/g DDD, and 1.75 micrograms/g DDT. Ten heavy metals and trace elements (Hg, Se, B, Cr, Cu, Fe, Mg, Mn, Sr, and Zn) were detected in 90% of the samples but at levels that were not of concern. In 1993-1994, concentrations of DDE in eggs of aquatic birds of the lower Laguna Madre were much lower than levels detected in this area during the late 1970s and early 1980s. Concentrations of DDE, PCBs, and trace metals in eggs detected in this study could not be associated with deformities or other detrimental effects on birds.

  19. Seagrasses, Dredging and Light in Laguna Madre, Texas, U.S.A.

    Science.gov (United States)

    Onuf, Christopher P.

    1994-07-01

    Light reduction resulting from maintenance dredging was the suspected cause of large-scale loss of seagrass cover in deep parts of Laguna Madre between surveys conducted in 1965 and 1974. Additional changes to 1988, together with an analysis of dredging frequency and intensity for different parts of the laguna, were consistent with this interpretation. Intensive monitoring of the underwater light regime and compilation of detailed environmental data for 3 months before and 15 months after a dredging project in 1988 revealed reduced light attributable to dredging in four of eight subdivisions of the study area, including the most extensive seagrass meadow in the study area. Dredging effects were strongest close to disposal areas used during this project but still were detectable on transects >1·2 km from the nearest dredge disposal area. In the subdivision of the study area where most of the dredge disposal occurred, light attenuation was increased throughout the 15 months of observation after dredging. In the seagrass meadow and the transition zone at the outer edge of the meadow, effects were evident up to 10 months after dredging. Resuspension and dispersion events caused by wind-generated waves are responsible for the propagation of dredge-related turbidity over space and time in this system.

  20. “Aunque verde, todo cinturón Aprieta”

    Directory of Open Access Journals (Sweden)

    Eulalia Borja Bedoya

    2016-05-01

    Full Text Available Medellín, en su afán de venderse al mundo como una ciudad de servicios se ha vuelto hipócrita con sus ciudadanos y ha venido construyendo desde los centros de poder trasnacionales unos modelos de ciudad excluyentes, que cada vez intentan acabar con esos que no han tenido mucho, pero que luchan con lo poco, que se han tomado a Medellín y han construido otras maneras de vivirse la ladera, siempre en una lucha constante, reivindicando su derecho a la ciudad; Las laderas de Medellín si bien se han ido conformando en gran parte como cinturones de miseria, al mismo tiempo también lo han hecho como territorios de vida y resistencia. Allá se siembra y se aprende a vivir con dignidad aunque sin mucho dinero, saben qué es lo verde porque vienen del campo y saben cultivar la tierra, son conscientes de que habitan un territorio con agua, árboles, suelos para cuidar y respetar y es por eso que durante todos estos años han sabido hacerse una misma con la montaña que los acogió cuando la ciudad entera les dio la espalda.

  1. Watershed management program on Santiago Island, Cape Verde

    Science.gov (United States)

    Lopes, Vicente L.; Meyer, John

    1993-01-01

    The Watershed Management Program (WMP) was put into operation in early 1985 on Santiago Island, Cape Verde, with the stated purpose, “to develop and protect the soil and water resources of the Program-designated watersheds … to stabilize the natural environment and increase agricultural production potential in the Program area.” The approach to soil and water conservation in the program has been to build erosion and flood control structures (engineering approach) and plant trees (biological approach) to decrease rill and gully erosion, trap sediment behind control structures, provide flood protection, increase infiltration, increase fuelwood and fodder production, and increase water supplies for irrigation. There have been many successes resulting from specific management activities, but flawed approach or implementation in a few key areas has acted to impede the program's complete success, including lack of a scientific basis for evaluating its impact on soil and water conservation; poor design, placement, and maintenance of some major hydraulic structures; inadequate intervention in stabilizing farmlands or education of farmers and landowners in the need for and benefits of agroforestry; and incomplete integration of engineering and biological approaches.

  2. Late Neogene stratigraphy and tectonic control on facies evolution in the Laguna Salada Basin, northern Baja California, Mexico

    Science.gov (United States)

    Martín-Barajas, A.; Vázquez-Hernández, S.; Carreño, A. L.; Helenes, J.; Suárez-Vidal, F.; Alvarez-Rosales, J.

    2001-10-01

    The Laguna Salada Basin (LSB) in northeastern Baja California records late-Neogene marine incursions in the Salton Trough and progradation of the Colorado River delta. Early subsidence and subsequent tectonic erosion are related to evolution of the Sierra El Mayor detachment fault during late Miocene time (geothermal exploratory well on the eastern margin of LSB. Interfingering fluvial-sandstone deposits and prograding alluvial fanglomerates with coarse debris-flow and rock-avalanche deposits crudely mark the onset of vertical slip along the Laguna Salada fault and rapid uplift of Sierra Cucapa and Sierra El Mayor. Up to 2 km of Quaternary alluvial-fan and lacustrine deposits accumulated along the eastern margin of LSB, whereas lower subsidence rates produced a thinner sedimentary wedge over a ramp-like crystalline basement along the western margin. In early Pleistocene time (˜2-1 Ma), the Laguna Salada became progressively isolated from the Colorado River delta complex, and the Salton Trough by activity on the Elsinore and Laguna Salada fault zones.

  3. Winter distributions of North American Plovers in the Laguna Madre regions of Tamaulipas, Mexico and Texas, USA

    Science.gov (United States)

    Mabee, Todd J.; Plissner, Jonathan H.; Haig, Susan M.; Goossen, J.P.

    2001-01-01

    To determine the distribution and abundance of wintering plovers in the Laguna Madre of Texas and Tamaulipas, surveys were conducted in December 1997 and February 1998, along a 160 km stretch of barrier islands in Mexico and- 40 km of shoreline on South Padre Island, Texas. Altogether, 5,673 individuals, representing six plover species, were recorded during the surveys. Black-bellied Plovers Pluvialis squatarola were the most numerous (3 ,013 individuals) representing 53% of the total number of plovers observed. Numbers of Piping Charadriusm elodu, Snowy C . alexandrinus, Semipalmated C. semipalmatus and Wilson's Plovers C. wilsonia were 739, 1,345, 561, and 13 birds, respectively. Most individuals (97%) of all species except Wilson's Plovers were observed on bayside flats of the barrier islands. Similar numbers of Piping Plovers were recorded at South Padre Island, Texas, and in the Laguna Madre de Tamaulipas. Over 85% of the individuals of each of the other species were found in the more extensively surveyed Mexico portion of Laguna Madre. In Tamaulipas, most plover species were observed more often on algal flats than any other substrate. These results provide evidence of the value of these systems as wintering areas for plover species and indicate the need for more extensive survey efforts to determine temporal and spatial variation in the distribution of these species within the Laguna ecosystem.

  4. Luminescence dating of the PASADO core 5022-1D from Laguna Potrok Aike (Argentina) using IRSL signals from feldspar

    DEFF Research Database (Denmark)

    Buylaert, Jan-Pieter; Murray, A.S.; Gebhardt, A.C.;

    2013-01-01

    We have measured and tested a luminescence chronology for the PASADO core 5022-1D from the maar lake of Laguna Potrok Aike. Because of unsuitable quartz OSL characteristics, sand-sized K-feldspar extracts were chosen as a dosimeter and the dose was measured using a post-IR IRSL (pIRIR290) measure...

  5. 77 FR 14058 - Santa Teresa Southern Railroad, LLC-Operation Exemption-Rail Line of Verde Logistics Railroad...

    Science.gov (United States)

    2012-03-08

    ... Logistics Railroad, LLC at Santa Teresa, Dona Ana County, NM Santa Teresa Southern Railroad, LLC (STSR), a... feet of rail line owned by Verde Logistics Railroad, LLC (Verde). The rail line extends between a point... to shippers and receivers located in the Santa Teresa Logistics Industrial Park. \\1\\ STSR states...

  6. Modern and subrecent spatial distribution and characteristics of sediment infill controlled by internal depositional dynamics, Laguna Potrok Aike (southern Patagonia, Argentina)

    Science.gov (United States)

    Kastner, S.; Ohlendorf, C.; Haberzettl, T.; Lücke, A.; Maidana, N. I.; Mayr, C.; Schäbitz, F.; Zolitschka, B.

    2009-04-01

    Situated in the dry steppe environment of south-eastern Patagonia the 100 m deep and max. 770 ka old maar lake Laguna Potrok Aike (51°58'S, 70°23'W) has a high potential as a palaeolimnological key site for the reconstruction of terrestrial palaeoclimate conditions. As this area is sensitive to variations in southern hemispheric wind and pressure systems the lake holds a unique lacustrine record of palaeoclimatic and palaeoecological variability. Depositional changes inferred from the lacustrine sediment sequence as well as subaerial and subaquatic lake level terraces provide detailed information about the water budget of the lake related to the variability of the Southern Hemispheric Westerlies. For this reason the lake was chosen as an ICDP drilling site in 2008 within the "Potrok Aike maar lake sediment archive drilling project" (PASADO). Based on high resolution multi-proxy investigations of the last 16,000 years carried out on a 18.9 m long sediment record (Haberzettl et al., 2007; Mayr et al., 2009; Wille et al., 2007) this study focuses on the understanding of internal depositional dynamics which control the characteristics and spatial distribution of the sediment infill of this lake. Furthermore, it provides information improving the accuracy of the interpretation of the long sediment record recovered within the PASADO project. A survey of the spatial sediment distribution was carried out in 2005 using 46 gravity cores of up to 49 cm length covering a range of water depths from 9 to 100 m. All 46 cores were scanned with X-ray fluorescence technique and for magnetic susceptibility with up to 1 mm spatial resolution. Using Ca and Ti as well as magnetic susceptibility data the cores were correlated and linked to the established age model (Haberzettl et al., 2005). As these parameters vary considerably and not consistently within the suite of littoral cores, a correlation prior to the 2005 sediment surface is solely based on cores from water depths exceeding

  7. FOGO-2014: Monitoring the Fogo 2014 Eruption, Cape Verde

    Science.gov (United States)

    Fernandes, Rui; Faria, Bruno

    2015-04-01

    Fogo volcano, located in the Cape Verde Archipelago offshore Western Africa, is a complete stratovolcano system that was created by the Cape Verde hotspot, forming the island of Fogo. The top (Pico do Fogo) reaches ~2830m above sea level, and raises ~1100m above Chã das Caldeiras, an almost flat circular area with approximately 10 kilometres in the north-south direction and 7 kilometres in the east-west direction. Chã das Caldeiras, surrounded towards the West by the ~1000m high Bordeira rampart, has been inhabited since the early 20th Century, because it is one of the most productive agricultural areas in this semi-arid country. Fogo volcano erupted on November 23, 2014 (~10:00UTC) on a subsidiary vent of the main cone, after 19 years of inactivity. C4G (Collaboratory for Geosciences), a distributed research infrastructure created in 2014 in the framework of the Portuguese Roadmap for Strategic Research Infrastructures, immediately offered support to the Cape Verdean authorities, with the goal of complementing the permanent geophysical monitoring network operated in Fogo island by INMG, the Cape Verdean Meteorological and Geophysical Institute. This permanent network is composed of seven seismographic stations and three tiltmeter stations, and the data is transmitted in real time to the INMG geophysical laboratory in São Vicente Island, where it is analysed on a routine basis. Pre-eruptive activity started to be detected by the permanent monitoring network on October 2014, with earthquakes occurring at depths larger than 15 km. These events led to a first volcanic warning to the Cape Verdean Civil Protection Agency. On November 22 several volcano-tectonic earthquakes were recorded at shallow depths, indicating shallow fracturing. On the basis of this activity, INMG issued a formal alert of an impending eruption to the Civil Protection Agency, ~24 hours before the onset of the eruption. Volcanic tremor and clear tiltmeter signals were recorded about one hour

  8. INTERAKSI TROFIK JUVENIL IKAN DAN UDANG DI LAGUNA SEGARA ANAKAN, CILACAP

    Directory of Open Access Journals (Sweden)

    Didik Wahju Hendro Tjahjo

    2016-05-01

    Full Text Available Segara Anakan mempunyai peran penting sebagai kawasan pengelolaan sumber daya ikan dan udang. Beberapa jenis ikan dan udang menggunakan laguna ini sebagai daerah asuhan. Penelitian dengan tujuan untuk mengetahui aspek biologi juvenil ikan dan udang dalam memanfaatkan sumber daya makanan alami dilakukan di perairan laguna Segara Anakan Kabupaten Cilacap pada tahun 2010. Pengambilan sampel dilakukan dengan menggunakan metode tersratifikasi dengan menetapkan 9 stasiun pengamatan. Analisis data meliputi kebiasaan makan, tingkat trofik, luas relung serta interaksi juvenile ikan dan udang dalam memanfaatkan sumber daya makanan alami. Hasil analisis kebiasaan makan menunjukkan bahwa juvenil ikan dan udang dapat dikelompokan menjadi tiga tingkatan trofik yaitu herbivora (2,00 – 2,50, omnivora (2,51 – 3,00 dan karnivora (3,01 – 3,50.  Luas relung makanan juvenil ikan dan udang adalah relatif sempit atau bersifat spesialis dengan nilai indeks berkisar antara 1,00 – 3,02. Hasil analisis kesamaan dalam pemanfaatan sumber daya makanan menunjukkan bahwa interaksi antar jenis ikan dan udang relatif rendah, sehingga peluang terjadinya kompetisi antar jenis rendah. Kondisi ini dapat diartikan bahwa ketersediaan makanan alami di perairan laguna tidak menjadi faktor pembatas.   Segara Anakan loogon plays an important role as the management area of fish and shrimp resources. Several species of fish and shrimp use this lagoon as an area of nursery ground. A research aimed to investigate the biological aspects of juvenile fish and shrimps in the utilization of natural food resources. Have been conductcd in the lagoon of Segara Anakan, Cilacap District in 2010. Sampling was done by using a stratification method with 9 research stations. Food habits, trophic level, niche width and interactions in the utilization of natural food resources were analyzed. Results showed that the juveniles of fish and shrimp could be grouped into three trophic levels i

  9. Trace metal partitioning in Thalassia testudinum and sediments in the Lower Laguna Madre, Texas.

    Science.gov (United States)

    Whelan, Thomas; Espinoza, Jorge; Villarreal, Xiomara; Cottagoma, Maria

    2005-01-01

    Seagrass communities dominate the Laguna Madre, which accounts for 25% of the coastal region of Texas. Seagrasses are essential to the health of the Laguna Madre (LM) and have experienced an overall decline in coverage in the Lower Laguna Madre (LLM) since 1967. Little is known on the existing environmental status of the LLM. This study focuses on the trace metal chemistry of four micronutrient metals, Fe, Mn, Cu, and Zn, and two non-essential metals, Pb and As, in the globally important seagrass Thalassia testudinum. Seasonal trends show that concentrations of most essential trace metals increase in the tissue during the summer months. With the exception of (1) Cu in the vertical shoot and root, and (2) Mn in the roots, no significant positive correlation exists between the rhizosphere sediment and T. testudinum tissue. Iron indicates a negative correlation between the morphological units and the rhizosphere sediments. No other significant relationship was found between the sediments and the T. testudinum tissue. Mn was enriched up to 10-fold in the leaf tissue relative to the other morphological units and also enriched relative to the rhizosphere sediments. Both Cu and Mn appear to be enriched in leaf tissue compared to other morphological units and also enriched relative to the Cu and Mn in the rhizoshpere sediments. Sediments cores taken in barren areas were slightly elevated in Zn relative to the rhizosphere sediments, whereas no other metals showed statistical differences between barren sediment cores and rhizosphere sediments. However, no correlation was measured in T. testudinum tissue and Zn in rhizosphere sediments. Previous studies suggested that Fe/Mn ratios could indicate differences between seagrass environments. Our results indicate that there is an influence from the Rio Grande in the Fe/Mn signature in sediments, and that ratio is not reflected in the T. testudinum tissue. The results from this study show that the LLM contains trace metal

  10. Subsidios ao planejamento de sistemas de areas verdes baseado em principios de ecologia urbana

    OpenAIRE

    Hardt, Leticia Peret Antunes

    2013-01-01

    Com a finalidade de verificar a relação entre o ambiente urbano e as áreas verdes, a pesquisa, através da avaliação de Curitiba como estudo de caso, descreve a situação da cidade, desenvolve procedimentos a nível de métodos e técnicas e fornece subsídios a modelos teóricos para o processo de planejamento de sistemas de áreas verdes urbanas. Por amostragem, através de fotointerpretação, foram estimadas as áreas permeáveis e impermeáveis e algumas tipologias de áreas verdes (com e sem cobertura...

  11. EFECTOS PSICOAMBIENTALES DE LAS ÁREAS VERDES EN LA SALUD MENTAL

    Directory of Open Access Journals (Sweden)

    Joel Martínez-Soto

    2016-01-01

    Full Text Available El presente trabajo es una revisión de diversas evidencias sobre: a problemática ambiental de carencia de áreas verdes urbanas que constituye una amenaza no sólo a la salud ecológica, sino pública en lo que refiere a la salud mental. b Recurrencia de trastornos mentales en escenarios urbanos y la necesidad de valorar el rol de las áreas verdes como ambientes promotores de salud. c El ambiente físico como escenario que tiene influencias directas en la salud. d Ambientes restaurativos y restauración psicológica. e Aproximación ecológica social para el estudio de las áreas verdes como promotoras de salud mental.

  12. Groundwater Resources of Ribeira Paul Basin, Island of Santo Antao, Cape Verde, West Africa

    Science.gov (United States)

    Heilweil, Victor M.; Gingerich, Stephen B.; Verstraeten, Ingrid M.

    2010-01-01

    Groundwater resources in Cape Verde provide water for agriculture, industry, and human consumption. These resources are limited and susceptible to contamination. Additional groundwater resources are needed for continued agricultural development, particularly during times of drought, but increased use and (or) climatic change may have adverse effects on the quantity and quality of freshwater available. In volcanic island aquifers such as those of Cape Verde, a lens of fresh groundwater typically ?floats? upon a layer of brackish water at the freshwater/saltwater boundary, and increased pumping may cause salt water intrusion or other contamination. A recent U.S. Geological Survey study assessed baseline groundwater conditions in watersheds on three islands of Cape Verde to provide the scientific basis for sustainably developing water resources and minimizing future groundwater depletion and contamination.

  13. Groundwater Resources of Ribeira Faja Basin, Island of Sao Nicolau, Cape Verde, West Africa

    Science.gov (United States)

    Heilweil, Victor M.; Gingerich, Stephen B.; Plummer, L. Niel; Verstraeten, Ingrid M.

    2010-01-01

    Groundwater resources in Cape Verde provide water for agriculture, industry, and human consumption. These resources are limited and susceptible to contamination. Additional groundwater resources are needed for continued agricultural development, particularly during times of drought, but increased use and (or) climatic change may have adverse effects on the quantity and quality of freshwater available. In volcanic island aquifers such as those of Cape Verde, a lens of fresh groundwater typically ?floats? upon a layer of brackish water at the freshwater/saltwater boundary, and increased pumping may cause salt water intrusion or other contamination. A recent U.S. Geological Survey study assessed baseline groundwater conditions in watersheds on three islands of Cape Verde to provide the scientific basis for sustainably developing water resources and minimizing future groundwater depletion and contamination.

  14. Groundwater Resources of Mosteiros Basin, Island of Fogo, Cape Verde, West Africa

    Science.gov (United States)

    Heilweil, Victor M.; Gingerich, Stephen B.; Plummer, L. Niel; Verstraeten, Ingrid M.

    2010-01-01

    Groundwater resources in Cape Verde provide water for agriculture, industry, and human consumption. These resources are limited and susceptible to contamination. Additional groundwater resources are needed for continued agricultural development, particularly during times of drought, but increased use and (or) climatic change may have adverse effects on the quantity and quality of freshwater available. In volcanic island aquifers such as those of Cape Verde, a lens of fresh groundwater typically ?floats? upon a layer of brackish water at the freshwater/saltwater boundary, and increased pumping may cause salt water intrusion or other contamination. A recent U.S. Geological Survey study assessed baseline groundwater conditions in watersheds on three islands of Cape Verde to provide the scientific basis for sustainably developing water resources and minimizing future groundwater depletion and contamination.

  15. Libro verde: Derechos de autor en la economía del conocimiento

    OpenAIRE

    2008-01-01

    El objetivo del presente Libro Verde es promover un debate sobre la mejor manera de garantizar la difusión en línea de los conocimientos en los ámbitos de la investigación, la ciencia y la educación. El Libro Verde pretende plantear una serie de cuestiones relacionadas con el papel de los derechos de autor en la «economía del conocimiento» y poner en marcha una consulta a este respecto.

  16. The apid cuckoo bees of the Cape Verde Islands (Hymenoptera, Apidae

    Directory of Open Access Journals (Sweden)

    Jakub Straka

    2012-08-01

    Full Text Available The apid cuckoo bees of the Cape Verde Islands (Republic of Cape Verde are reviewed and five species recognized, representing two genera. The ammobatine genus Chiasmognathus Engel (Nomadinae: Ammobatini, a specialized lineage of cleptoparasites of nomioidine bees is recorded for the first time. Chiasmognathus batelkai sp. n. is distinguished from mainland African and Asian species. The genus Thyreus Panzer (Apinae: Melectini is represented by four species – Thyreus denolii sp. n., T. batelkai sp. n., T. schwarzi sp. n., and T. aistleitneri sp. n. Previous records of Thyreus scutellaris (Fabricius from the islands were based on misidentifications.

  17. The apid cuckoo bees of the Cape Verde Islands (Hymenoptera, Apidae).

    Science.gov (United States)

    Straka, Jakub; Engel, Michael S

    2012-01-01

    The apid cuckoo bees of the Cape Verde Islands (Republic of Cape Verde) are reviewed and five species recognized, representing two genera. The ammobatine genus Chiasmognathus Engel (Nomadinae: Ammobatini), a specialized lineage of cleptoparasites of nomioidine bees is recorded for the first time. Chiasmognathus batelkaisp. n. is distinguished from mainland African and Asian species. The genus Thyreus Panzer (Apinae: Melectini) is represented by four species - Thyreus denoliisp. n., Thyreus batelkaisp. n., Thyreus schwarzisp. n., and Thyreus aistleitnerisp. n. Previous records of Thyreus scutellaris (Fabricius) from the islands were based on misidentifications.

  18. Planejamento ambiental de areas verdes, estudo de caso : distrito sede do minicipio de Campinas - SP

    OpenAIRE

    Andrea Maria Morero

    1996-01-01

    Resumo: Em dias atuais, o planejamento de áreas verdes em sistemas urbanos tem se preocupado em conciliar a conservação dos recursos naturais com as facilidades recreativas de um espaço aberto. Neste enfoque, o presente trabalho propõe o planejamento ambiental de áreas verdes urbanas e peri-urbanas do Município de Campinas, baseado em três abordagens principais: a conservação dos ecossistemas naturais remanescentes, a educação ambiental e o lazer. De acordo com essas abordagens, foram selecio...

  19. Sobrevivencia y cobertura de plantas en techos verdes durante el estiaje en Yucatán

    OpenAIRE

    E. E. Ordóñez-López; C. Zetina-Moguel; M. Pérez-Cortés

    2012-01-01

    La búsqueda del confort térmico en edificaciones al menor costo energético es una aspiración humana; en Yucatán la alta temperatura ambiental estimula la búsqueda de tecnologías que maximicen el confort al interior de las viviendas. Los techos verdes son una de las opciones tecnológicas que se orientan a este objetivo. La selección adecuada de plantas y sustratos para techos verdes tiene efecto importante sobre su efectividad y costo económico. Los resultados obtenidos de este estudio pueden ...

  20. Os Direitos da Criança em Portugal e Cabo Verde

    OpenAIRE

    Fonseca, Graça

    2004-01-01

    Analisam-se os direitos das crianças e de jovens que praticam crimes em Portugal e Cabo Verde, à luz da Convenção das Nações Unidas sobre os Direitos da Criança, ao longo da década de 90. O tradicional “modelo proteccionista” foi dando lugar, em virtude do aparente crescimento da delinquência juvenil, ao “modelo de justiça”, onde se conjugam a defesa da sociedade e o reconhecimento dos direitos processuais dos menores. Portugal adoptou o segundo modelo, enquanto em Cabo Verde permanece o segu...

  1. Proposal - Mapping of Six Federally Endangered Listed Plants and Surveying the Population Status of Eugenia woodburyana at La Tinaja, Laguna Cartagena National Wildlife Refuge. Lajas, Puerto Rico

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This proposal concerns the distribution and relative abundance of 5 federally endangered plants endemic to Puerto Rico and specifically on Laguna Cartagena National...

  2. Response of shoal grass, Halodule wrightii, to extreme winter conditions in the Lower Laguna Madre, Texas

    Science.gov (United States)

    Hicks, D.W.; Onuf, C.P.; Tunnell, J.W.

    1998-01-01

    Effects of a severe freeze on the shoal grass, Halodule wrightii, were documented through analysis of temporal and spatial trends in below-ground biomass. The coincidence of the second lowest temperature (-10.6??C) in 107 years of record, 56 consecutive hours below freezing, high winds and extremely low water levels exposed the Laguna Madre, TX, to the most severe cold stress in over a century. H. wrightii tolerated this extreme freeze event. Annual pre- and post-freeze surveys indicated that below-ground biomass estimated from volume was Unaffected by the freeze event. Nor was there any post-freeze change in biomass among intertidal sites directly exposed to freezing air temperatures relative to subtidal sites which remained submerged during the freezing period.

  3. Shallow sublittoral benthic communities of the Laguna Estuarine System, South Brazil

    Directory of Open Access Journals (Sweden)

    Gustavo Fonseca

    2006-03-01

    Full Text Available Sediment properties, microphytobenthos biomass (chlorophyll a and phaeopigments, and the structure of the benthic communities of the three main lagoons (Mirim, Imaruí and Santo Antonio of the Laguna Estuarine System, South Brazil, were analyzed during summer and winter. Microphytobenthos biomass did not differ significantly among the lagoons, but showed higher values in the summer. The macrofauna was characterized by low species richness and the dominance of the gastropod Heleobia australis, the tanaidean Kalliapseudes schubartti and the bivalve Erodona mactroides. The meiofauna was composed of 20 higher taxa and the nematodes dominated in all the lagoons and periods. Desmodora (Desmodora sp.1, Terschllingia sp. and Microlaimus sp. were numerically the most important among the 74 nematode species registered. This study showed that, in the Laguna Estuarine System, differences in the benthos among lagoons and periods were dependent on the fauna component analyzed. Whilst macrofauna and nematodes were significantly more diverse in the inner stations, in the Mirim Lagoon, the number of meiofauna taxa did not differ significantly among the lagoons and the diversity and evenness were highest in Santo Antonio. These results were a response of the fauna to the salinity oscillations coupled with the heterogeneity of the sediment in the lagoons. The temporal variability of the fauna, macrofauna being more abundant in the summer and meiofauna in the winter, could be related to the different life strategies of these groups.Propriedades do sedimento, biomassa microfitobêntica (clorofila a e feopigmentos, e a estrutura das comunidades bênticas das três principais lagoas (Mirim, Imaruí e Santo Antonio do Sistema Estuarino de Laguna, sul do Brasil, foram analisadas durante o verão e inverno. A biomassa microfitobêntica não diferiu significativamente entre as lagoas, mas seus valores foram maiores no verão. A macrofauna foi caracterizada pela baixa

  4. Beam Transfer Systems for the LAGUNA-LBNO Long Baseline Neutrino Beam from the CERN SPS

    CERN Document Server

    Goddard, B; Efthymiopoulos, I; Papaphilippou, Y; Parfenova, A

    2013-01-01

    For the Long Baseline neutrino facility under study at CERN (LAGUNA-LBNO) it is initially planned to extract a 400 GeV beam from the second long straight section in the SPS into the existing transfer channel TT20 leading to the North Area experimental zone, to a new target aligned with a far detector at a distance of 2300 km [1]. In a second phase a new High-Power Proton Synchrotron (HPPS) accelerator is proposed, to give a 2 MW beam at about 50 GeV on the same target. In this paper the required beam transfer systems are outlined, including the new sections of transfer line between the Superconducting Proton Linac (SPL), HP-PS and SPS, and from the SPS to the target, and also the injection and extraction systems in the long straight section of the HPPS. The feasibility of a 4 GeV H- injection system is discussed.

  5. Late Pleistocene-early Holocene karst features, Laguna Madre, south Texas: A record of climate change

    Energy Technology Data Exchange (ETDEWEB)

    Prouty, J.S. [Texas A& M Univ., Corpus Christi, TX (United States)

    1996-09-01

    A Pleistocene coquina bordering Laguna Madre, south Texas, contains well-developed late Pleistocene-early Holocene karst features (solution pipes and caliche crusts) unknown elsewhere from coastal Texas. The coquina accumulated in a localized zone of converging longshore Gulf currents along a Gulf beach. The crusts yield {sup 14}C dates of 16,660 to 7630 B.P., with dates of individual crust horizons becoming younger upwards. The karst features provide evidence of regional late Pleistocene-early Holocene climate changes. Following the latest Wisconsinan lowstand 18,000 B.P. the regional climate was more humid and promoted karst weathering. Partial dissolution and reprecipitation of the coquina formed initial caliche crust horizons; the crust later thickened through accretion of additional carbonate laminae. With the commencement of the Holocene approximately 11,000 B.P. the regional climate became more arid. This inhibited karstification of the coquina, and caliche crust formation finally ceased about 7000 B.P.

  6. Martin Chalfie y la proteína verde fluorescente Martin Chalfie y la proteína verde fluorescente

    Directory of Open Access Journals (Sweden)

    Zacarías Pereira Vega

    2012-12-01

    Full Text Available The history of the green fluorescent protein (GFP starts with Osamu Shimomura at the beginning of the 1960s, with his discovery from the extracts of the Aequorea victoria jellyfish. However, it is not until the beginning of the 1990s, that the neurobiologist Martin Chalfie, applying genetic engineering tech- niques, achieved for the first time the heterology expression of the GFP in prokaryotes (E. coli and eukaryotes (Caernohabditis elegans, from a clone of the jellyfish’s gen that codifies the GFP prepared by Douglas Prasher. Besides fluorescing in green, the results from this work also demonstrated that it does not require any other cofactor or enzyme of the jellyfish for its expression or for the own forming of a fluorophore. At the same time, Chalfie proposed that the GFP could be used for the marking of cells on living ani- mals or the tag of proteins. Based upon these results, many scientists started working on research related to the GFP; actually this protein is used on different fields such as biotechnol- ogy, development biology, environmental chemistry and medicine. In the case of the latter, it has helped to elucidate the cellular mechanisms from which diseases are made of. Science owes Roger Tsien, amongst other contributions, the creation of differ- ent mutations of the GFP.La historia de la proteína verde fluorescente (GFP se inicia con Osamu Shimomura a principios de la década de 1960, con su descubrimiento de esta proteína a partir de extractos de la medusa Aequorea victoria. Sin embargo, es a principios de la década de 1990 que el neurobiólogo Martin Chalfie, aplicando técnicas de ingeniería genética, logra por primera vez la expresión heteróloga de la GFP en procariotas (Escherichia coli y eucariotas (Caernohabditis elegans, a partir de un clon del gen de la medusa que codifica a la GFP, preparado por Douglas Prasher. Además de fluorescer en verde, los resultados de este trabajo también demostraron que no se

  7. Dosimetry in nuclear power plants; Dosimetria en centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Lastra B, J. A. [CFE, Central Laguna Verde, Km. 42.5 Carretera Cardel-Nautla, Veracruz (Mexico)

    2008-12-15

    To control the occupationally exposed personnel dose working at the Laguna Verde nuclear power plant, two types of dosemeters are used, the thermoluminescent (TLD) which is processed monthly, and the direct reading dosemeter that is electronic and works as daily control of personal dose. In the case of the electronic dosemeters of direct reading conventional, the readings and dose automatic registers and the user identity to which he was assigned to each dosemeter was to carry out the restricted area exit. In activities where the ionizing radiation sources are not fully characterized, it is necessary to relocate the personal dosemeter or assigned auxiliary dosemeters (TLDs and electronics) to determine the dose received by the user to both whole body and in any specific area of it. In jobs more complicated are used a tele dosimetry system where the radiation protection technician can be monitoring the user dose to remote control, the data transmission is by radio. The dosimetry activities are documented in procedures that include dosemeter inventories realization, the equipment and dosemeters calibration, the dosimetry quality control and the discrepancies investigation between the direct reading and TLD systems. TLD dosimetry to have technical expertise in direct and indirect dosimetry and two technicians in TLD dosimetry; electronic dosimetry to have 4 calibration technicians. For the electronic dosemeters are based on a calibrator source of Cesium-137. TLD dosemeters to have an automatic radiator, an automatic reader which can read up to 100 TLD dosemeters per hour and a semiautomatic reader. To keep the equipment under a quality process was development a process of initial entry into service and carried out a periodic verification of the heating cycles. It also has a maintenance contract for the equipment directly with the manufacturer to ensure their proper functioning. The vision in perspective of the dosimetry services of Laguna Verde nuclear power plant

  8. Demand Constraints and New Demands: Regulations, Markets and Institutions Efficiency (A Case Study for Cape Verde

    Directory of Open Access Journals (Sweden)

    Bernardo Reynolds Pacheco de Carvalho

    2014-08-01

    Full Text Available Economic efficiency is a key issue in economic research and for policy design, and certainly for food security challenges. In the food system dynamics the understanding of changes and trends is crucial to improve our capacity to deal with the objectives of sustainable development and quality of life. Food system efficiency evaluation is necessary with regard to production and consumption efficiencies as well as market and governance dilemmas. Regulations and institutional efficiency are crucial aspects that are frequently forgotten, and efforts should be made to improve the capacity to deal with those methodological needs. In many situations, in the real world, data and measurements are difficult or even impossible to get in numeric or quantitative terms. Frequently, a qualitative evaluation is the only way to proceed, but measurements and numeric references are still important, mainly when changes over time are central to the research. The actual paper follows a structural food system model (WFSE – World Food Security Equation and a general equilibrium approach (ICI model – induced changes and innovation model to show in a country case study (Cape Verde the important role of markets and institutions as compared to regulation practices directed to improve economic efficiency subject to demand behavior. Cape Verde is a very challenging country with regard to the food security status (where natural resources are very poor for agricultural production but with great success in global and macro terms in the last 10 years. The main problems nowadays are clearly at local level. The present research tries to highlight the global achievements and explore local assessment efforts on food consumption conditions. A specific region is studied, in the island of Santo Antão, one of the most important production regions. Three different production systems were compared mainly with regard to their respective influence on consumption habits, incomes and

  9. Ostracode Paleoecology and Trace Element Shell Chemistry: A case study from Laguna Salada, Baja California, Mexico.

    Science.gov (United States)

    Romero-Mayen, V.; Bernal, J.; Palacios-Fest, M.; Carreno, A.

    2007-05-01

    The Laguna Salada Basin in northeastern Baja California constitutes the southwestern limit of the Salton Trough and provides insights into the evolution of marine and non-marine sedimentary basins during the latest Neogene at the head of the Gulf of California. A 43 m long core (LS04-1) recovered from the Basin consisted of alternating clay, silt and sand beds with gypsum lenses. Three radiocarbon dates provided the age control: 41,520±790 cal years BP at 30.21 m, 25,590±320 cal years BP at 26.60 m and 15,150±70 cal years BP at 7.50 m. A total of 103 samples were analyzed for taxonomy, taphonomy and geochemistry. Eighteen marine and brackish- water ostracode species and nine benthic foraminifera species were identified. Faunal changes suggest variations in the water source with the opening of the basin to the Gulf of California. The Mg/Ca and Sr/Ca ratios of valves of two ostracode species (Limnocythere staplini and Cyprideis castus) were measured using ICPMS. Based on the Mg/Ca ratios, water paleotemperatures were estimated using a regression model. Shell chemistry shows mixed results. Some intervals fit an acceptable range, whereas other are unrealistic. Analysis of Sr/Ca ratios ostracode valves from the conflicting horizons show evidence of diagenetic effects. The fossil assemblages indicate two dry periods: prior to the 41,520 cal years BP and after the 15 ,150 cal years BP, with the maximum highstand of the basin between 25,590 and 15,150 cal years BP. Given the diagenetic effects at Laguna Salada, ostracode shell chemistry paleotemperature estimates may not be warranted in attempting to determine this parameter from the dry periods shown by faunal assemblages.

  10. BIOCHEMICAL, NUTRIENT AND INHIBITORY CHARACTERISTICS OF STREPTOMYCES CULTURED FROM A HYPERSALINE ESTUARY, THE LAGUNA MADRE (TEXAS

    Directory of Open Access Journals (Sweden)

    Luis E. Espinoza

    2013-01-01

    Full Text Available Streptomyces are common soil bacteria that produce secondary metabolites, including several antibiotics; however, the characteristics of marine Streptomyces are largely unknown. Sediment samples were taken from 3 sites in the Laguna Madre to isolate marine Streptomyces. Sediment was diluted, spread onto synthetic seawater media to estimate the total bacterial density of the samples and spread onto starch casein agar to isolate Streptomyces. Isolated Streptomyces were tested for salinity tolerance and optimal growth pH. Isolates were assayed using API 20E® test strips and BIOLOG™ plates to construct biochemical profiles and assess nutrient utilization abilities of the bacteria, respectively. Individual Streptomyces were tested for the ability to inhibit the growth of other isolated Streptomyces (i.e., interference competition and putatively identified by DNA sequencing. Results showed that there was no significant difference in microbial density in sediments from the 3 sampling sites. Eleven (11 Streptomyces pure cultures were obtained in total; most tolerated salinity up to 60 ppt and grew optimally at pH 7.5. Biochemical profile comparisons showed that the Streptomyces were only at least 74% similar; most (8/11 were >90% similar. Isolates could use between 87-95 carbon sources. Three (3 isolates displayed interference toward other isolates. Ten (10 isolates were identified as Streptomyces griseus by DNA sequencing. Laguna Madre Streptomyces organisms display some diverse characteristics with regards to their halotolerance, biochemical profiles, carbon source utilization and inhibition toward other organisms. Further investigations may yield greater understanding of these organisms in this and other marine environments and may be a reservoir of novel microorganisms and secondary metabolites.

  11. Implementacion de modulos constructivistas que atiendan "misconceptions" y lagunas conceptuales en temas de la fisica en estudiantes universitarios

    Science.gov (United States)

    Santacruz Sarmiento, Neida M.

    Este estudio se enfoco en los "misconception" y lagunas conceptuales en temas fundamentales de Fisica como son Equilibrio Termodinamico y Estatica de fluidos. En primer lugar se trabajo con la identificacion de "misconceptions" y lagunas conceptuales y se analizo en detalle la forma en que los estudiantes construyen sus propias teorias de fenomenos relacionados con los temas. Debido a la complejidad en la que los estudiantes asimilan los conceptos fisicos, se utilizo el metodo de investigacion mixto de tipo secuencial explicativo en dos etapas, una cuantitativa y otra cualitativa. La primera etapa comprendio cuatro fases: (1) Aplicacion de una prueba diagnostica para identificar el conocimiento previo y lagunas conceptuales. (2) Identificacion de "misconceptions" y lagunas del concepto a partir del conocimiento previo. (3) Implementacion de la intervencion por medio de modulos en el topico de Equilibrio Termodinamico y Estatica de Fluidos. (4) Y la realizacion de la pos prueba para analizar el impacto y la efectividad de la intervencion constructivista. En la segunda etapa se utilizo el metodo de investigacion cualitativo, por medio de una entrevista semiestructurada que partio de la elaboracion de un mapa conceptual y se finalizo con un analisis de datos conjuntamente. El desarrollo de este estudio permitio encontrar "misconceptions" y lagunas conceptuales a partir del conocimiento previo de los estudiantes participantes en los temas trabajados, que fueron atendidos en el desarrollo de las distintas actividades inquisitivas que se presentaron en el modulo constructivista. Se encontro marcadas diferencias entre la pre y pos prueba en los temas, esto se debio al requerimiento de habilidades abstractas para el tema de Estatica de Fluidos y al desarrollo intuitivo para el tema de Equilibrio Termodinamico, teniendo mejores respuestas en el segundo. Los participantes demostraron una marcada evolucion y/o cambio en sus estructuras de pensamiento, las pruebas estadisticas

  12. CARACTERIZACIÓN SOCIO-AMBIENTAL DE UN PAISAJE TRANSFORMADO: EL CASO DE LA LAGUNA NEGRA.TRELEW. CHUBUT. ARGENTINA

    Directory of Open Access Journals (Sweden)

    Gladys Alcarraz

    2008-12-01

    Full Text Available La ciudad de Trelew se encuentra en la Provincia del Chubut, departamento Rawson, a los 43o 14' de Latitud Sur y 65o 19' de Longitud Oeste, su Ejido Municipal cubre una superficie total de 248 km2. Aproximadamente el 70% de los líquidos cloacales domiciliarios y pluviales de la ciudad de Trelew, son vertidos desde principios de la década del 70’ a un sistema lagunar. Originalmente estas lagunas eran cuencas naturales, algunas permanentes y otras temporarias, alimentadas por aguas subterráneas y por precipitaciones. Los bajos, hoy convertidos en lagunas permanentes, hidrológicamente representaban áreas de descarga -evaporación- alimentadas por los aportes de cañadones que drenan desde la terraza intermedia y el valle o bien por crecientes y desbordes del Río Chubut. Hoy el proceso se ha revertido, y las lagunas aportan agua en forma constante al sistema freático, habiéndose convertido entonces, en áreas de recarga -infiltración-, con consecuencias ambientales, paisajísticas y sociales. El objetivo del presente trabajo fue determinar la variación multitemporal de las lagunas de estabilización de la ciudad de Trelew, desde los años 1969 a 2005 para estimar las consecuencias producidas en el paisaje y caracterizar social y económicamente la población aledaña a las lagunas. Metodológicamente, para caracterizar el área de estudio y realizar una evolución de la misma desde las características originales hasta la actualidad se utilizó la teledetección y un relevamiento censal a campo con aplicación de encuestas y observación directa. La población aledaña a las lagunas presenta características particulares en cuanto a las actividades económicas que desarrollan, las condiciones en las que viven y llevan adelante esas actividades, conformando “asentamientos aislados”, precarios, que le dan cierto carácter de espacio rural marginal, como categoría en el continuo rural-urbano. Cuando se cambian artificialmente las

  13. Análisis morfológico de escarpas asociadas a una falla de intraplaca con actividad cuaternaria: falla Las lagunas, Córdoba

    Directory of Open Access Journals (Sweden)

    Diego Villalba

    2014-03-01

    Full Text Available El objetivo de la presente contribución es, mediante el análisis cuantitativo de la morfología de escarpas de falla desarrolladas sobre sedimentos cuaternarios, estimar las edades de las reactivaciones prehistóricas e históricas de la falla Las Lagunas. El área de estudio se ubica al SO del departamento Río Cuarto, en el sector pedemontano de la sierra de Comechingones entre las localidades de Achiras y Sampacho, a 33° 18' S y 64° 49´ O, región central de Argentina. El análisis morfológico cuantitativo se realizó mediante la obtención de perfiles topográficos de detalle transversales a la traza de la estructura y la aplicación de curvas de regresión para determinar sus edades. Esto permitió interpretar que las evidencias de deformación mecánica, ruptura en superficie, corresponden a, al menos, cuatro fuertes terremotos asociados a esta falla con ocurrencia en los últimos 10 ka. Con esta información se elaboró una curva de aproximación característica para rupturas en superficie, asociadas a esta falla, de edades menores o iguales a 100 años.

  14. “Uma força que atrai”: o significado das drogas para usuários de uma ilha de Cabo Verde “Una fuerza que atrae”: el significado de las drogas para usuarios de una Isla de Cabo Verde “An attractive force”: the meaning of drugs to users from an island in Cape Verde

    Directory of Open Access Journals (Sweden)

    Augusto César Lima Neves

    2010-06-01

    Full Text Available Este estudo teve como objetivo compreender o significado do consumo de drogas na perspectiva de usuários, atendidos em um ambulatório do Serviço da Saúde Mental de uma ilha do arquipélago de Cabo Verde. Dada a natureza do problema, esta investigação utilizou a abordagem qualitativa, tendo como referencial metodológico a Teoria Fundamentada nos Dados, à luz do Interacionismo Simbólico. Participaram do estudo nove usuários de drogas do referido ambulatório. A entrevista gravada e a observação foram as estratégias de obtenção de dados. A análise comparativa dos dados resultou no fenômeno central “uma força que atrai”, expressando a grande dificuldade que os usuários têm para se afastar do consumo abusivo de substâncias psicoativas, sabendo, previamente, que todos os problemas enfrentados nas esferas pessoal, familiar e social advêm da habituação. Este estudo permitiu, assim, identificar pontos vulneráveis de possível atuação da equipe de saúde, visando a prevenção do abuso de drogas.Ese estudio cualitativo tuvo como objetivo comprender el significado del consumo de drogas desde la perspectiva de usuarios atendidos en una clínica del Servicio de Salud Mental de una isla del archipiélago de Cabo Verde. La investigación tuvo como referencial metodológico la Teoría Fundamentada en los Datos, bajo la interpretación del Interaccionismo Simbólico. Participaron del estudio nueve usuarios de drogas de la referida clínica. La grabación de la entrevista y su observación fueron las estrategias para obtener los datos. El análisis comparativo de los datos mostró como resultado el fenómeno central “Una fuerza que atrae”, que expresa la gran dificultad que los usuarios tienen para alejarse del consumo abusivo de substancias psicoactivas, sabiendo, previamente, que todos los problemas enfrentados en las esferas personal, familiar y social provienen de la drogadicción. Este estudio permitió, así, identificar

  15. Soil and Water Conservation Strategies in Cape Verde (Cabo Verde in Portuguese and Their Impacts on Livelihoods: An Overview from the Ribeira Seca Watershed

    Directory of Open Access Journals (Sweden)

    Isaurinda Baptista

    2015-01-01

    Full Text Available Severe land degradation has strongly affected both people’s livelihood and the environment in Cape Verde (Cabo Verde in Portuguese, a natural resource poor country. Despite the enormous investment in soil and water conservation measures (SWC or SLM, which are visible throughout the landscape, and the recognition of their benefits, their biophysical and socioeconomic impacts have been poorly assessed and scientifically documented. This paper contributes to filling this gap, by bringing together insights from literature and policy review, field survey and participatory assessment in the Ribeira Seca Watershed through a concerted approach devised by the DESIRE project (the “Desire approach”. Specifically, we analyze government strategies towards building resilience against the harsh conditions, analyze the state of land degradation and its drivers, survey and map the existing SWC measures, and assess their effectiveness against land degradation, on crop yield and people’s livelihood. We infer that the relative success of Cape Verde in tackling desertification and rural poverty owes to an integrated governance strategy that comprises raising awareness, institutional framework development, financial resource allocation, capacity building, and active participation of rural communities. We recommend that specific, scientific-based monitoring and assessment studies be carried out on the biophysical and socioeconomic impact of SLM and that the “Desire approach” be scaled-up to other watersheds in the country.

  16. Sediment transport on the Palos Verdes shelf, California

    Science.gov (United States)

    Ferré, Bénédicte; Sherwood, Christopher R.; Wiberg, Patricia L.

    2010-04-01

    Sediment transport and the potential for erosion or deposition have been investigated on the Palos Verdes (PV) and San Pedro shelves in southern California to help assess the fate of an effluent-affected deposit contaminated with DDT and PCBs. Bottom boundary layer measurements at two 60-m sites in spring 2004 were used to set model parameters and evaluate a one-dimensional (vertical) model of local, steady-state resuspension, and suspended-sediment transport. The model demonstrated skill (Brier scores up to 0.75) reproducing the magnitudes of bottom shear stress, current speeds, and suspended-sediment concentrations measured during an April transport event, but the model tended to underpredict observed rotation in the bottom-boundary layer, possibly because the model did not account for the effects of temperature-salinity stratification. The model was run with wave input estimated from a nearby buoy and current input from four to six years of measurements at thirteen sites on the 35- and 65-m isobaths on the PV and San Pedro shelves. Sediment characteristics and erodibility were based on gentle wet-sieve analysis and erosion-chamber measurements. Modeled flow and sediment transport were mostly alongshelf toward the northwest on the PV shelf with a significant offshore component. The 95th percentile of bottom shear stresses ranged from 0.09 to 0.16 Pa at the 65-m sites, and the lowest values were in the middle of the PV shelf, near the Whites Point sewage outfalls where the effluent-affected layer is thickest. Long-term mean transport rates varied from 0.9 to 4.8 metric tons m -1 yr -1 along the 65-m isobaths on the PV shelf, and were much higher at the 35-m sites. Gradients in modeled alongshore transport rates suggest that, in the absence of a supply of sediment from the outfalls or PV coast, erosion at rates of ˜0.2 mm yr -1 might occur in the region southeast of the outfalls. These rates are small compared to some estimates of background natural sedimentation

  17. Sediment transport on the Palos Verdes shelf, California

    Science.gov (United States)

    Ferre, B.; Sherwood, C.R.; Wiberg, P.L.

    2010-01-01

    Sediment transport and the potential for erosion or deposition have been investigated on the Palos Verdes (PV) and San Pedro shelves in southern California to help assess the fate of an effluent-affected deposit contaminated with DDT and PCBs. Bottom boundary layer measurements at two 60-m sites in spring 2004 were used to set model parameters and evaluate a one-dimensional (vertical) model of local, steady-state resuspension, and suspended-sediment transport. The model demonstrated skill (Brier scores up to 0.75) reproducing the magnitudes of bottom shear stress, current speeds, and suspended-sediment concentrations measured during an April transport event, but the model tended to underpredict observed rotation in the bottom-boundary layer, possibly because the model did not account for the effects of temperature-salinity stratification. The model was run with wave input estimated from a nearby buoy and current input from four to six years of measurements at thirteen sites on the 35- and 65-m isobaths on the PV and San Pedro shelves. Sediment characteristics and erodibility were based on gentle wet-sieve analysis and erosion-chamber measurements. Modeled flow and sediment transport were mostly alongshelf toward the northwest on the PV shelf with a significant offshore component. The 95th percentile of bottom shear stresses ranged from 0.09 to 0.16 Pa at the 65-m sites, and the lowest values were in the middle of the PV shelf, near the Whites Point sewage outfalls where the effluent-affected layer is thickest. Long-term mean transport rates varied from 0.9 to 4.8 metric tons m-1 yr-1 along the 65-m isobaths on the PV shelf, and were much higher at the 35-m sites. Gradients in modeled alongshore transport rates suggest that, in the absence of a supply of sediment from the outfalls or PV coast, erosion at rates of ???0.2 mm yr-1 might occur in the region southeast of the outfalls. These rates are small compared to some estimates of background natural sedimentation

  18. Abundancia de juveniles de camarones peneidos comerciales en la zona norte de Laguna Madre, México Abundance of the commercial penaeid shrimp juveniles in the North zone of Laguna Madre, Mexico

    Directory of Open Access Journals (Sweden)

    Armando T. Wakida-Kusunoki

    2008-03-01

    Full Text Available Se tomaron muestras mensuales de agosto del 2005 a noviembre del 2006, para analizar los cambios de abundancia de juveniles de camarones peneidos comerciales en la parte norte de Laguna Madre, Tamaulipas. En cada una de las nueve estaciones de muestreo se realizó un arrastre nocturno, utilizando una red tipo chinchorro, de tamaño de malla de 1.25 cm y seis metros de longitud de relinga inferior. Se observaron tres especies de peneidos comerciales y cada una de ellas tuvo sus valores más altos de abundancia en diferentes periodos del año. El camarón café, Farfantepenaeus aztecus fue más abundante de abril-mayo; el camarón rosado, Farfantepenaeus dourarum en diciembre-enero y el camarón blanco, Litopenaeus setiferus en julio y septiembre. Estos resultados muestran que estas especies tienen un uso temporal diferencial en Laguna Madre, Tamaulipas.Monthly samplings were carried out during August, 2005 to November, 2006 to analizing the changes of the abundance of commercial juvenile penaeid shrimps in the North part of Laguna Madre, Tamaulipas. In every nine points a night trawl were carried out using a seine net of mesh size of 1.25 cm and 6 m length of bottom rope. Three commercial penaeid shrimp species were found and each one presented high abundance values for different periods of the year. Brown shrimp, Farfantepenaeus aztecus, in April-May period; pink shrimp, Farfantepenaeus dourarum, in December-January, and the white shrimp, Litopenaeus setiferus in July and September. These results showed that different species presented a differential temporal use in Laguna Madre.

  19. Neohyssura atlantica n.sp. from the Cape Verde Islands (Crustacea: Isopoda: Anthuridea)

    NARCIS (Netherlands)

    Wägele, Johann Wolfgang

    1987-01-01

    A fourth species of Neohyssura is described from a beach of a lagoon of Ilha do Sal (Cape Verde Islands). The species is blind and can easily be recognized by the oval, spinose outline of the telson and the spines on the uropodal endopod.

  20. Verde urbano e processi ambientali: per una progettazione di paesaggio multifunzionale

    Directory of Open Access Journals (Sweden)

    Raffaele Pelorosso

    2013-04-01

    Full Text Available L’impermeabilizzazione delle superfici determina un’alterazione del sistema idrologico, con un incremento dei volumi e dei picchi dei deflussi delle acque meteoriche. Il fenomeno è destinato a progredire, sia per il contributo che vi deriva dalla costante crescita delle superfici urbanizzate (urban sprawl, sia per i cambiamenti climatici in atto, che accentuano la frequenza delle piogge critiche. Una serie di misure e tecniche (Best Management Practices, BMPs sono state sviluppate per la gestione sostenibile delle acque meteoriche urbane. Alcune  BMPs (es: verde pensile, bacini di detenzione/ritenzione, zone umide possono svolgere inoltre una funzione ecologica (divenendo habitat per specie animali e vegetali, di termoregolazione, estetica e di promozione del capitale sociale. È quindi necessario sperimentare metodologie di progettazione e gestione del verde urbano e periurbano, la cui multifunzionalità consente di perseguire la strada della sostenibilità ambientale. Su tale traccia, questo lavoro presenta un percorso metodologico orientato a valutare alcune strategie integrate di controllo dei deflussi urbani, attraverso l’aumento della permeabilità di alcune parti sensibili di città. Il verde, quindi, non è visto come semplice infrastruttura necessaria a soddisfare generici standard urbanistici, ma ne sono analizzate le funzionalità, in questa prima fase di carattere idrologico, ma che, in prospettiva, con la stessa armatura verde, esso può assumere un ruolo ecologico, sociale, di mitigazione del clima e di emissione di gas clima-alteranti.

  1. Horizontal Gaze Palsy and Progressive Scoliosis With ROBO 3 Mutations in Patients From Cape Verde.

    Science.gov (United States)

    Mendes Marques, Nadine B P S; Barros, Sandra R; Miranda, Ana F; Nobre Cardoso, João; Parreira, Sónia; Fonseca, Teresa; Donaire, Nelvia M; Campos, Nuno

    2016-10-03

    Horizontal gaze palsy with progressive scoliosis (HGPPS) is a rare and autosomal recessive syndrome. We describe 2 cases of HGPPS which are the first documented in patients of African ancestry from an isolated population in Cape Verde. They demonstrated typical findings on neuro-ophthalmic examination and brain magnetic resonance imaging. One patient had novel heterozymous mutations of the ROB0 3 gene.

  2. Optimizing soil and water management in dryland farming systems in Cabo Verde

    NARCIS (Netherlands)

    Santos Baptista Costa, Dos I.

    2016-01-01

     “Optimizing Soil and Water Management in Dryland Farming Systems in Cabo Verde” Isaurinda Baptista Summary Soil and land degradation poses a great challenge for sustainable development worldwide and, in Cabo Verde, has strongly affected both people

  3. Promoting Distance Education in Higher Education in Cape Verde and Mozambique

    Science.gov (United States)

    Ramos, Fernando; Taju, Gulamo; Canuto, Louisette

    2011-01-01

    Over the past six years, the authors have been project leaders for three distance education initiatives in Cape Verde and Mozambique: (1) a blended learning master's degree in multimedia in education for faculty in Cape Verdean public higher education institutions (2005-2008); (2) a teacher training programme for 1375 elementary teachers provided…

  4. Survey of ICT and Education in Africa : Cape Verde Country Report

    OpenAIRE

    Tutu, Osei Agyeman

    2007-01-01

    This short country report, a result of larger Information for Development Program (infoDev)-supported survey of Information and Communication Technologies (ICT) in education in Africa, provides a general overview of current activities and issues related to ICT use in education in the country. Cape Verde has made significant strides in the implementation of ICTs in education. The drawback o...

  5. Geology of a Stable Intraplate Region: The Cape Verde/Canary Basin,

    Science.gov (United States)

    1982-03-01

    reflections. 102 I ’~ VIII. References Bebiano, J.B. (1932). "A Geologia do Arquipelago do Cabo Verde. Comm. Serv. Albers, Vernon M. (1965...eds.), The Ocean Content. Mexico City, Mexico , 43rd Basin and Margins, V. 2, The North Annual International Meeting of the Atlantic. New York

  6. Tetrapocillon atlanticus n.sp. (Porifera, Poecilosclerida) from the Cape Verde Islands

    NARCIS (Netherlands)

    Soest, van R.W.M.

    1988-01-01

    A representative of the rare genus Tetrapocillon Brondsted (1924) was found for the first time in the Atlantic Ocean, dredged at 70 m depth during the recent CANCAP VII Expedition to the Cape Verde Islands. The single specimen differed from the previously known Indo-Pacific specimens of the genus (

  7. Marine interstitial Amphipoda and Isopoda (Crustacea) from Santiago, Cape Verde Islands

    NARCIS (Netherlands)

    Stock, Jan H.; Vonk, Ronald

    1992-01-01

    Three species of Amphipoda are recorded from interstices of a marine beach on the island of Santiago, Cape Verde Archipelago: Cabogidiella littoralis n. gen., n. sp. (Bogidiellidae), Psammogammarus spinosus n. sp. (Melitidae), and Idunella sketi Karaman, 1980 (Liljeborgiidae). The latter, widely dis

  8. Assessment of tight-gas resources in Canyon sandstones of the Val Verde Basin, Texas, 2016

    Science.gov (United States)

    Schenk, Christopher J.; Tennyson, Marilyn E.; Klett, Timothy R.; Mercier, Tracey J.; Brownfield, Michael E.; Gaswirth, Stephanie B.; Hawkins, Sarah J.; Leathers-Miller, Heidi M.; Marra, Kristen R.; Finn, Thomas M.; Pitman, Janet K.

    2016-07-08

    Using a geology-based assessment methodology, the U.S. Geological Survey assessed mean resources of 5 trillion cubic feet of gas and 187 million barrels of natural gas liquids in tight-gas assessment units in the Canyon sandstones of the Val Verde Basin, Texas.

  9. A paleolimnological perspective on industrial-era metal pollution in the central Andes, Peru

    Energy Technology Data Exchange (ETDEWEB)

    Cooke, Colin A. [Department of Geology, University of Pittsburgh, Pittsburgh, PA 15260 (United States); Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2E3 (Canada)], E-mail: cacooke@ualberta.ca; Abbott, Mark B. [Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2E3 (Canada); Section of Anthropology, Carnegie Museum of Natural History, Pittsburgh, PA 15206 (United States)

    2008-04-15

    To date, few studies have investigated the environmental legacy associated with industrialization in the South American Andes. Here, we present an environmental archive of industrial pollution from {sup 210}Pb-dated lake cores recovered from Laguna Chipian, located near the Cerro de Pasco metallurgical region and Laguna Pirhuacocha, located near the Morococha mining region and the La Oroya smelting complex. At Laguna Chipian, trace metal concentrations increase beginning {approx} 1900 AD, coincident with the construction of the central Peruvian railway, and the rapid industrial development of the Cerro de Pasco region. Trace metal concentrations and fluxes peak during the 1950s before subsequently declining up-core (though remaining well above background levels). While Colonial mining and smelting operations are known to have occurred at Cerro de Pasco since at least 1630 AD, our sediment record preserves no associated metal deposition. Based on our {sup 14}C and {sup 210}Pb data, we suggest that this is due to a depositional hiatus, rather than a lack of regional Colonial pollution. At Laguna Pirhuacocha, industrial trace metal deposition first begins {approx} 1925 AD, rapidly increasing after {approx} 1950 AD and peaking during either the 1970s or 1990s. Trace metal concentrations from these lakes are comparable to some of the most polluted lakes in North America and Europe. There appears to be little diagenetic alteration of the trace metal record at either lake, the exception being arsenic (As) accumulation at Laguna Pirhuacocha. There, a correlation between As and the redox-sensitive element manganese (Mn) suggests that the sedimentary As burden is undergoing diagenetic migration towards the sediment-water interface. This mobility has contributed to surface sediment As concentrations in excess of 1100 {mu}g g{sup -1}. The results presented here chronicle a rapidly changing Andean environment, and highlight a need for future research in the rate and magnitude

  10. A paleolimnological perspective on industrial-era metal pollution in the central Andes, Peru.

    Science.gov (United States)

    Cooke, Colin A; Abbott, Mark B

    2008-04-15

    To date, few studies have investigated the environmental legacy associated with industrialization in the South American Andes. Here, we present an environmental archive of industrial pollution from (210)Pb-dated lake cores recovered from Laguna Chipian, located near the Cerro de Pasco metallurgical region and Laguna Pirhuacocha, located near the Morococha mining region and the La Oroya smelting complex. At Laguna Chipian, trace metal concentrations increase beginning ~1900 AD, coincident with the construction of the central Peruvian railway, and the rapid industrial development of the Cerro de Pasco region. Trace metal concentrations and fluxes peak during the 1950s before subsequently declining up-core (though remaining well above background levels). While Colonial mining and smelting operations are known to have occurred at Cerro de Pasco since at least 1630 AD, our sediment record preserves no associated metal deposition. Based on our (14)C and (210)Pb data, we suggest that this is due to a depositional hiatus, rather than a lack of regional Colonial pollution. At Laguna Pirhuacocha, industrial trace metal deposition first begins ~1925 AD, rapidly increasing after ~1950 AD and peaking during either the 1970s or 1990s. Trace metal concentrations from these lakes are comparable to some of the most polluted lakes in North America and Europe. There appears to be little diagenetic alteration of the trace metal record at either lake, the exception being arsenic (As) accumulation at Laguna Pirhuacocha. There, a correlation between As and the redox-sensitive element manganese (Mn) suggests that the sedimentary As burden is undergoing diagenetic migration towards the sediment-water interface. This mobility has contributed to surface sediment As concentrations in excess of 1100 microg g(-1). The results presented here chronicle a rapidly changing Andean environment, and highlight a need for future research in the rate and magnitude of atmospheric metal pollution.

  11. Desenvolvimento do pessegueiro 'Flordaprince' sob duas intensidades de poda verde 'Flordaprince' peach behaviour after two intensities of green pruning

    Directory of Open Access Journals (Sweden)

    Alessandro Rodrigues

    2009-09-01

    Full Text Available Pessegueiros 'Flordaprince' [Prunus persica (L. Batsch] foram submetidos a duas intensidades de poda verde (leve e de renovação, 45 dias após a colheita, com o objetivo de verificar seu efeito sobre o desenvolvimento, a produção, qualidade de frutos e as concentrações de carboidratos solúveis totais em raízes e ramos. O experimento foi realizado em condições de campo, em Piracicaba (SP, durante a safra 2003/2004, utilizando-se 48 plantas em espaçamento de 3,0 m x 1,2 m, sob sistema de líder central. O delineamento experimental utilizado foi o inteiramente casualizado, constituído de dois tratamentos e doze repetições. A parcela experimental correspondeu a duas plantas, nas quais foram analisados o florescimento efetivo, a densidade de brotação, o crescimento de ramos após a poda verde e após a poda de frutificação, o desenvolvimento, a produção e a qualidade dos frutos e as concentrações de carboidratos solúveis totais presentes em raízes e ramos. A poda de renovação acarretou menor concentração de carboidratos solúveis totais nas raízes durante o período de dormência. Essa poda também reduziu a fixação de frutos e o teor de sólidos solúveis, embora tenha acarretado maior massa individual de frutos. As intensidades de poda verde não influenciaram na concentração de carboidratos solúveis totais em ramos, no desenvolvimento dos frutos e crescimento de ramos após a poda de frutificação. Houve maior acúmulo de carboidratos solúveis totais nas raízes, durante todo o ciclo.'Flordaprince' peach [Prunus persica (L. Batsch] was submitted to two levels of green pruning intensity (mild and renewal, 45 days after harvest, with the objective of evaluating its effects on plant development, production, fruit quality and soluble carbohydrates in roots and branches. The experiment was carried out at University of São Paulo, Piracicaba, Brazil, in the 2003/2004 season. The experimental designed was entirely

  12. La pantalla de papel. El cine en la prensa de La Laguna antes de la guerra civil

    Directory of Open Access Journals (Sweden)

    Lic. Enrique Ramírez Guedes

    1998-01-01

    Full Text Available Con la llegada del cine a la ciudad de La Laguna (Tenerife, Islas Canarias, en 1906, la prensa local comienza a tomar conciencia de la importancia del nuevo medio y a realizar un minucioso seguimiento de su devenir. Ya desde los primeros momentos las páginas de los rotativos laguneros sirven como plataforma para la difusión de las ideas y opiniones que en materia cinematográfica se estaban gestando entre los intelectuales locales, provocando verdaderos debates sobre su utilidad, sus repercusiones éticas y morales, o, más relacionado con lo cinematográfico, su calidad estética. Este notable interés por el cine se mantiene como una constante hasta el estallido de la guerra civil española, época en que se extingue el último periódico de La Laguna.

  13. Estudio preliminar de contaminación bacteriológica en la laguna Pueblo Viejo, Veracruz, México

    OpenAIRE

    Guadalupe Barrera Escorcia; Irma Wong Chang; Alma S Sobrino Figueroa; Xóchitl Guzmán García; Fabiola Hernández Galindo; Fernando Saavedra Villeda

    1998-01-01

    La contaminación bacteriológica de la laguna de Pueblo Viejo fue evaluada en agua, sedimento y ostión, a través de las concentraciones de bacterias coliformes y estreptococos fecales (en dos épocas del año). Los conteos se realizaron utilizando la técnica de tubos múltiples de fermentación y se determinaron parámetros fisicoquímicos simultáneamente. Los resultados indican que el agua de la laguna fue inadecuada tanto para el cultivo de ostión, como para la recreación con contacto primario y p...

  14. Humberto Hernández (2002, Una palabra ganada. Notas lingMsticas. La Laguna, Tenerife: Altasur Ediciones; 337 pp.

    Directory of Open Access Journals (Sweden)

    Jasmina Markič

    2003-12-01

    Full Text Available Humberto Hernández, filólogo español y catedrático de la Universidad de La Laguna es el autor de Una palabra ganada - Notas lingüísticas, libra publicado en el año 2002 por Altasur Ediciones de La Laguna, Tenerife, en la colección Ensayo. El título del libro Una palabra ganada es un verso de Rilke y refleja bien el objetivo de la obra: el interés por los problemas normativos de la lengua. Con palabras de Manuel Seco, autor del prólogo, “nada lees ajeno a Humberto Hernández. Siempre tiene algo que decir de este milagro del lenguaje, aunque sea para mostrar los tristes harapos que con él nos hacemos los hablantes«.

  15. Larvicidal activity against Aedes aegypti of Foeniculum vulgare essential oils from Portugal and Cape Verde.

    Science.gov (United States)

    Rocha, Diara Kady; Matosc, Olivia; Novoa, Maria Teresa; Figueiredo, Ana Cristina; Delgado, Manuel; Moiteiro, Cristina

    2015-04-01

    Dengue is a potentially fatal mosquito-borne infection with 50 million cases per year and 2.5 billion people vulnerable to the disease. This major public health problem has recurrent epidemics in Latin America and occurred recently in Cape Verde and Madeira Island. The lack of anti-viral treatment or vaccine makes the control of mosquito vectors a high option to prevent virus transmission. Essential oil (EO) constituents can affect insect's behaviour, being potentially effective in pest control. The present study evaluated the potential use of Foenicultm vulgare (fennel) EO in the control of the dengue vector Aedes aegypti. EOs isolated from fennel aerial parts collected in Cape Verde and from a commercial fennel EO of Portugal were analysed by NMR, GC and GC-MS. trans-Anethole (32 and 30%, respectively), limonene (28 and 18%, respectively) and fenchone (10% in both cases) were the main compounds identified in the EOs isolated from fennel from Cape Verde and Portugal, respectively. The larvicidal activity of the EOs and its major constituents were evaluated, using WHO procedures, against third instar larvae ofAe. aegypti for 24 h. Pure compounds, such as limonene isomers, were also assayed. The lethal concentrations LC50, C90 and LC99 were determined by probit analysis using mortality rates of bioassays. A 99% mortality of Ae. aegypti larvae was estimated at 37.1 and 52.4 µL L-1 of fennel EOs from Cape Verde and Portugal, respectively. Bioassays showed that fennel EOs from both countries displayed strong larvicidal effect against Ae. aegypti, the Cape Verde EO being as active as one of its major constituents, (-)-limonene.

  16. DIAGNÓSTICO DAS ÁREAS VERDES PÚBLICAS DO BAIRRO POTENGI, NATAL/RN

    OpenAIRE

    Liana de Holanda Viana Barros; Valdenildo Pedro da Silva; Geovanine Araújo Alves; Lidiane Gomes Pinheiro; Itamara do Nascimento; Pollyana Karla Lima Dias; Radimilla Fernanda Avelino de Oliveira; Viviane Almeida de Santana; Wagner Araújo Oliveira; Carla Stefânia Cabral de Medeiros; Brenda Suellen Franklin de Farias Gomes

    2015-01-01

    Este estudo teve por objetivo diagnosticar as principais áreas verdes do bairro Potengi, localizado na Região Administrativa Norte de Natal-RN. A metodologia adotada consistiu, principalmente, de levantamentos bibliográfico e documental e, posteriormente, de pesquisa de campo, por meio da qual foi possível se visitar ruas, praças, canteiros e passeios públicos do bairro. A detecção das áreas verdes se deu inicialmente com o uso do google Earth. Os resultados apontaram que as áreas verdes do b...

  17. A 6000-year record of ecological and hydrological changes from Laguna de la Leche, north coastal Cuba

    Science.gov (United States)

    Peros, Matthew C.; Reinhardt, Eduard G.; Davis, Anthony M.

    2007-01-01

    Laguna de la Leche, north coastal Cuba, is a shallow (≤ 3 m), oligohaline (˜ 2.0-4.5‰) coastal lake surrounded by mangroves and cattail stands. A 227-cm core was studied using loss-on-ignition, pollen, calcareous microfossils, and plant macrofossils. From ˜6200 to ˜ 4800 cal yr BP, the area was an oligohaline lake. The period from ˜ 4800 to ˜ 4200 cal yr BP saw higher water levels and a freshened system; these changes are indicated by an increase in the regional pollen rain, as well as by the presence of charophyte oogonia and an increase in freshwater gastropods (Hydrobiidae). By ˜ 4000 cal yr BP, an open mesohaline lagoon had formed; an increase in salt-tolerant foraminifers suggests that water level increase was driven by relative sea level rise. The initiation of Laguna de la Leche correlates with a shift to wetter conditions as indicated in pollen records from the southeastern United States (e.g., Lake Tulane). This synchronicity suggests that sea level rise caused middle Holocene environmental change region-wide. Two other cores sampled from mangrove swamps in the vicinity of Laguna de la Leche indicate that a major expansion of mangroves was underway by ˜ 1700 cal yr BP.

  18. Environmental History of Southern Patagonia Unraveled by Seismic Stratigraphy and Sediment Cores of Laguna Potrok Aike

    Science.gov (United States)

    Anselmetti, F. S.; Ariztegui, D.; de Batist, M.; Gebhardt, C.; Haberzettl, T.; Niessen, F.; Ohlendorf, C.; Zolitschka, B.

    2006-12-01

    Laguna Potrok Aike, located in Southernmost Patagonia (Argentina, 52°S) is a maar lake and likely provides the only continental Southern Patagonian archive that covers a long and continuous interval of several glacial- to-interglacial cycles. In the context of a proposed ICDP-drilling initiative (see Zolitschka et al., this session), several site surveys have been undertaken that characterize in detail the shallow subsurface of the lake. A variety of environmental changes are identified based on seismic stratigraphic analyses of a dense grid of high- resolution data. Long sediment cores recovered the material to date and calibrate these changes providing a chronology of events. The paleoenvironmental history reflects the complex interplay between variations in the hydrologic cycle, wind regime, and volcanic/tectonic activity. Laguna Potrok Aike is the largest and deepest lake (maximum depth 100 m) in the Pali Aike Volcanic Field. It is steeply-rimmed, circular in shape with a diameter of 3 km and surrounded subaerially by a series of paleoshorelines, reflecting its sensitivity to changes in the evaporation/precipitation ratio. Seismic subsurface data indicate a basinwide erosional unconformity, that consistently occurs on the shoulder of the lake down to a depth of -35 m (below modern lake level) marking the lowest lake level during the Late Glacial-to-Holocene times. Cores that penetrate this unconformity comprise MIS3-dated sediments (45 ka) 3.5 m below the unconformity that were deposited during high lake levels. These cores also provide an age of 6800 cal BP for the transgressional sediments burying the unconformity. This middle Holocene transgression following the maximum lake level lowstand marks the onset of a stepwise increase in moisture, as shown by a series of buried paleoshorelines that were formed during at least five lake level stillstands between the depths of -32 and -12 m. No indications point towards an intermittent lake level lowering, so that

  19. Chemometric Characterization of Alembic and Industrial Sugar Cane Spirits from Cape Verde and Ceará, Brazil

    Directory of Open Access Journals (Sweden)

    Regina F. R. Pereira

    2012-01-01

    Full Text Available Sugar cane spirits are some of the most popular alcoholic beverages consumed in Cape Verde. The sugar cane spirit industry in Cape Verde is based mainly on archaic practices that operate without supervision and without efficient control of the production process. The objective of this work was to evaluate samples of industrial and alembic sugar cane spirits from Cape Verde and Ceará, Brazil using principal component analysis. Thirty-two samples of spirits were analyzed, twenty from regions of the islands of Cape Verde and twelve from Ceará, Brazil. Of the samples obtained from Ceará, Brazil seven are alembic and five are industrial spirits. The components analyzed in these studies included the following: volatile organic compounds (n-propanol, isobutanol, isoamylic, higher alcohols, alcoholic grade, acetaldehyde, acetic acid, acetate; copper; and sulfates.

  20. Estudo prospectivo, duplo cego e cruzado da Camellia sinensis (chá verde nas dislipidemias Estudio prospectivo, doble ciego y cruzado de la Camellia sinensis (té verde en las dislipidemias Prospective double-blind crossover study of Camellia sinensis (green tea in dyslipidemias

    Directory of Open Access Journals (Sweden)

    Gesiani de Almeida Pierin Batista

    2009-08-01

    Full Text Available FUNDAMENTO: Estudos epidemiológicos estabeleceram uma associação entre dislipidemias e aterosclerose. A terapia nutricional é um ponto central da estratégia preventiva em indivíduos que apresentam fatores de risco para doença aterosclerótica. OBJETIVOS: Investigar os efeitos do chá verde (Camellia sinensis em pacientes portadores de dislipidemias. MÉTODOS: O estudo envolveu 33 pacientes, com idade entre 21 e 71 anos, que consumiam uma dieta com baixo teor de gorduras (25% a 35% das calorias totais e 200 mg de colesterol por dia. Foram randomizados para dois tratamentos sequenciais: cápsulas contendo 250 mg de extrato seco do chá verde ou placebo, administradas por um período total de 16 semanas, tendo cada paciente utilizado chá verde (Camellia sinensis por oito semanas e placebo em igual período. RESULTADOS: Os valores lipídicos basais (mg/dl foram os seguintes: HDL-colesterol 60,7 ± 7,3; colesterol total 255 ± 30,9; LDL-colesterol 158,8 ± 29,0; triglicerídeos 169,0 ± 61,3 e Apo-B 120,2 ± 18,9. As variações lipídicas médias, provocadas pelo uso do chá verde (Camellia sinensis, mostraram uma redução de 3,9 % (p = 0,006 nas concentrações do colesterol total e uma redução de 4,5 % (p = 0,026 do LDL-colesterol. A ingestão de chá verde não influenciou significativamente os níveis de HDL-colesterol, dos triglicerídeos e do Apo-B. Resultados não significativos foram observados na avaliação dos lipídeos sanguíneos (colesterol total e LDL-colesterol com o uso do placebo. CONCLUSÃO: Foi demonstrado o efeito benéfico do chá verde (Camellia sinensis, que reduziu significativamente, em oito semanas, os níveis de colesterol total e LDL-colesterol nesse grupo de pacientes.FUNDAMENTO: Estudios epidemiológicos establecieron una asociación entre dislipidemias y aterosclerosis. La terapia nutricional es un punto central de la estrategia preventiva en individuos que presentan factores de riesgo para enfermedad

  1. Estimating floodplain sedimentation in the Laguna de Santa Rosa, Sonoma County, CA

    Science.gov (United States)

    Curtis, Jennifer A.; Flint, Lorraine E.; Hupp, Cliff R.

    2013-01-01

    We present a conceptual and analytical framework for predicting the spatial distribution of floodplain sedimentation for the Laguna de Santa Rosa, Sonoma County, CA. We assess the role of the floodplain as a sink for fine-grained sediment and investigate concerns regarding the potential loss of flood storage capacity due to historic sedimentation. We characterized the spatial distribution of sedimentation during a post-flood survey and developed a spatially distributed sediment deposition potential map that highlights zones of floodplain sedimentation. The sediment deposition potential map, built using raster files that describe the spatial distribution of relevant hydrologic and landscape variables, was calibrated using 2 years of measured overbank sedimentation data and verified using longer-term rates determined using dendrochronology. The calibrated floodplain deposition potential relation was used to estimate an average annual floodplain sedimentation rate (3.6 mm/year) for the ~11 km2 floodplain. This study documents the development of a conceptual model of overbank sedimentation, describes a methodology to estimate the potential for various parts of a floodplain complex to accumulate sediment over time, and provides estimates of short and long-term overbank sedimentation rates that can be used for ecosystem management and prioritization of restoration activities.

  2. Estructura del ensamble de anuros de la Reserva Integral Laguna de los Padres (Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Stellatelli, Oscar Aníbal

    2010-11-01

    Full Text Available La Reserva Municipal Integral Laguna de los Padres (RILaPa contiene al humedal más grande del Partido de General Pueyrredón que conserva una fracción valiosa del patrimonio cultural y natural de los humedales pampeanos. Conocer no sólo el listado de las especies de anfibios presentes, sino también el "dónde, cuándo y cómo se localizan esas especies", es información que sirve como punto de partida para monitorear posteriormente su estado y evaluar las causas de posibles fluctuaciones numéricas. Por estas razones, el objetivo general de este trabajo es relevar la composición, abundancia relativa, distribución espacial y estado sanitario general de las poblaciones, haciendo un énfasis comparativo entre las áreas destinadas a la conservación y a la recreación.

  3. Vegetation and climate history from Laguna de Río Seco, Sierra Nevada, southern Spain

    Science.gov (United States)

    Anderson, R. S.; Jimenez-Moreno, G.

    2010-12-01

    The largest mountain range in southern Spain - the Sierra Nevada - is an immense landscape with a rich biological and cultural heritage. Rising to 3,479 m at the summit of Mulhacén, the range was extensively glaciated during the late Pleistocene. Subsequent melting of cirque glaciers allowed formation of numerous small lakes and wetlands. One south-facing basin contains Laguna de Río Seco, a small lake at ca. 3020 m elevation, presently above potential treeline. Pollen analysis of sediment cores documents over 11,000 calendar years of vegetation change there. The early record, to ca. 5,700 cal yr BP, is dominated by pine pollen, with birch, deciduous oak, and grass, with an understory of shrubs types. Pine trees probably never grew at the elevation of the lake, but aquatic microfossils indicate lake levels were highest prior to ca. 7,800 cal yr BP, perhaps as a result of heavy winter precipitation, and early Holocene expansion of the ITCZ. Drier conditions commenced by 5,700 cal yr BP, shown by declines in wetland pollen, and increases in high elevation steppe shrubs more common today (juniper, sage, and others). The local and regional impact of humans increased substantially after ca. 2700 years ago, with the regional loss of pine forest or woodland, increases in pollen and spore types associated with pasturing, and olive cultivation at lower elevations.

  4. Transformation to Eco-Agri Tourism: The Case of Casile, Cabuyao City, Laguna, Philippines

    Directory of Open Access Journals (Sweden)

    Tuzon Troy P.

    2014-01-01

    Full Text Available The study was conducted to determine the acceptability of the residents of Barangay Casile, Cabuyao, Laguna, Philippines in transforming their locality into an eco-agri tourism site. A total of 241 residents participated in the data collection using a survey questionnaire and interviews. Barangay Casile is an agricultural area and is also noted for its natural heritage such as the Matang Tubig River and Falls and the Marcos Twin Tower. Because of this, the local government unit of Cabuyao City plans to develop the area as a nature- based tourism destination specifically as an eco-agri tourism site. The survey revealed that the respondents agreed on the proposition of transforming their area into agri-tourism site. Cultural acceptability ranks the highest which means that the locals are open on the possible effects on their culture that the development could bring them. Economic and social acceptability were also ranked high because of the income they could get from the influx of tourists. Environmental acceptability is the least agreeable because most of the respondents were environment sensitive and are concerned with the changes to the natural façade of their area. It can be concluded that agri-tourism development involving local residents provides control over the development and management of the project.

  5. Laguna Negra Virus Infection Causes Hantavirus Pulmonary Syndrome in Turkish Hamsters (Mesocricetus brandti).

    Science.gov (United States)

    Hardcastle, K; Scott, D; Safronetz, D; Brining, D L; Ebihara, H; Feldmann, H; LaCasse, R A

    2016-01-01

    Laguna Negra virus (LNV) is a New World hantavirus associated with severe and often fatal cardiopulmonary disease in humans, known as hantavirus pulmonary syndrome (HPS). Five hamster species were evaluated for clinical and serologic responses following inoculation with 4 hantaviruses. Of the 5 hamster species, only Turkish hamsters infected with LNV demonstrated signs consistent with HPS and a fatality rate of 43%. Clinical manifestations in infected animals that succumbed to disease included severe and rapid onset of dyspnea, weight loss, leukopenia, and reduced thrombocyte numbers as compared to uninfected controls. Histopathologic examination revealed lung lesions that resemble the hallmarks of HPS in humans, including interstitial pneumonia and pulmonary edema, as well as generalized infection of endothelial cells and macrophages in major organ tissues. Histologic lesions corresponded to the presence of viral antigen in affected tissues. To date, there have been no small animal models available to study LNV infection and pathogenesis. The Turkish hamster model of LNV infection may be important in the study of LNV-induced HPS pathogenesis and development of disease treatment and prevention strategies.

  6. Las lagunas estratigráficas y las superficies negativas en arqueología

    Directory of Open Access Journals (Sweden)

    Murillo Fragero, José I.

    2004-12-01

    Full Text Available Owing much to geological research, archaeological stratigraphy and its tools and principles are developed through continuous experiences following a model of critical study and reflection. In this case, we have attempted to approach the issue of stratigraphic gaps, a concept that includes various processes (hiatuses, erosional gaps and that we have identified through negative surfaces. Their definition and documentation is often vital in archaeological analysis and historical archaeology.La estratigrafía arqueológica, deudora de la investigación geológica, templa sus herramientas y desarrolla sus principios gracias a las continuas experiencias llevadas a cabo de acuerdo a un modelo de trabajo y reflexión crítico. En este caso, hemos pretendido un acercamiento al tema de las lagunas estratigráficas, concepto que encierra distintos procesos (hiatos, vacíos erosionales y que identificamos gracias a las superficies negativas. Su definición y documentación es, a menudo, clave en el análisis arqueológico de la arquitectura histórica.

  7. Plan verde: un instrumento para la gestión y fomento de áreas verdes en el gran Santiago

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    Claudio Nilo Orellana

    2015-04-01

    Full Text Available La ciudad de Santiago, cuenta con una importante falencia de espacios verdes. La Organización Mundial de la Salud (OMS recomienda que las ciudades tengan 9 metros cuadrados por habitante. Por su parte, el Plan de Prevención y Descontaminación para la Región Metropolitana (PPDA se ha propuesto como meta lograr que el área Metropolitana logre un promedio de 6 metros cuadrados por habitante.

  8. Corredores verdes urbanos: estudo da viabilidade de conexão das áreas verdes de Vitória

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    Homero Marconi Penteado

    2007-12-01

    Full Text Available Grande parte dos profissionais de planejamento urbano tem buscado melhorar a qualidade de vida da população e a aplicação de princípios de sustentabilidade, que se refletem, na maioria dos casos, na busca de ampliação das áreas verdes, sejam na forma de parques, praças, arborização de vias ou mesmo incentivo aos jardins particulares. Esta pesquisa apresenta o resultado do estudo de viabilidade de criação de corredores verdes urbanos na cidade de Vitória, estabelecendo uma rede de conexões utilizando-se de sua malha viária, visando incrementar as condições ecológicas e paisagísticas urbanas e melhores condições de circulação de pedestres e ciclistas. Está alicerçada nos conceitos desenvolvidos pela ecologia da paisagem, baseada em fragmentos, corredores e matriz. A metodologia adotada foi aplicada em uma área teste, onde foram realizados levantamentos preliminares, mapeamento das áreas verdes, seleção de vias para implantação de corredores, avaliação dos possíveis corredores, inventário e análise das vias, diretrizes para estabelecimento dos corredores, ensaio projetual e criação de uma rede de corredores verdes. Dentre os principais resultados, verificou-se a possibilidade de criação de corredores com pequenas modificações nos perfis de vias que permitiriam a inserção de vegetação contínua, calçadas e ciclovias com consequências diretas (otimização das condições microclimáticas, melhoria na paisagem, atratividade para pequenos animais, incentivo ao percurso não motorizado, entre outros e indiretas (redução das partículas em suspensão, redução dos níveis de ruído e do consumo de combustíveis etc..

  9. Monte Verde: seaweed, food, medicine, and the peopling of South America.

    Science.gov (United States)

    Dillehay, Tom D; Ramírez, C; Pino, M; Collins, M B; Rossen, J; Pino-Navarro, J D

    2008-05-09

    The identification of human artifacts at the early archaeological site of Monte Verde in southern Chile has raised questions of when and how people reached the tip of South America without leaving much other evidence in the New World. Remains of nine species of marine algae were recovered from hearths and other features at Monte Verde II, an upper occupational layer, and were directly dated between 14,220 and 13,980 calendar years before the present ( approximately 12,310 and 12,290 carbon-14 years ago). These findings support the archaeological interpretation of the site and indicate that the site's inhabitants used seaweed from distant beaches and estuarine environments for food and medicine. These data are consistent with the ideas that an early settlement of South America was along the Pacific coast and that seaweeds were important to the diet and health of early humans in the Americas.

  10. Atividade antifúngica, in vitro, do óleo de café verde

    OpenAIRE

    Elizei,Virgínia Guerra; CHALFOUN, Sara Maria; Botelho,Deila Magna dos Santos; Rebelles,Pedro Paulo Reis

    2016-01-01

    RESUMO: O objetivo deste trabalho foi avaliar o efeito do contato direto e da fração volátildo óleo de café verde, testado nas concentrações de 500, 1.000, 1.500 e 2.000 µL L-1, sobre o crescimento micelial e a esporulação dos fungos Penicillium roqueforti e Rhizopus stolonifer. O óleo essencial de cravo-da-índia na concentração de 800 µL L-1 foi utilizado para comparação. Nas concentrações de 1.500 e 2.000 µL L-1, o óleo de café verde em contato direto proporcionou redução da esporulação do ...

  11. Metrópoles, cobertura vegetal, áreas verdes e saúde

    Directory of Open Access Journals (Sweden)

    Luís Fernando Amato-Lourenço

    2016-04-01

    Full Text Available A falta de planejamento no processo de urbanização das grandes metrópoles tem produzido numerosas externalidades negativas, entre elas a supressão de sua cobertura vegetal e de áreas verdes. Inúmeros benefícios têm sido reportados sobre como a presença da vegetação no meio ambiente urbano favorece fatores ambientais, sociais e econômicos, influenciando na saúde da população. O presente trabalho busca apresentar uma série de estudos com enfoque na associação entre áreas verdes e saúde e também uma sucinta reflexão sobre a importância do assunto no município de São Paulo.

  12. First report of Culex (Culex) tritaeniorhynchus Giles, 1901 (Diptera: Culicidae) in the Cape Verde Islands

    OpenAIRE

    Alves, Joana; Pina, Adilson de; Diallo, Mawlouth; Dia, Ibrahima

    2015-01-01

    During an entomological survey in Santiago Island, Cape Verde Islands, in November-December 2011 in order to study the bio-ecology and susceptibility to insecticides of Anopheles arabiensis Patton, 1905, Culex tritaeniorhynchus Giles, 1901 was found to be present in the Santa Cruz District. Both adult and immature specimens were collected and a description of both is given. Further confirmation of the taxonomic identity of the specimens was obtained from studying the male genitalia. This is t...

  13. Economía verde y economía del conocimiento

    OpenAIRE

    Duque Escobar, Gonzalo

    2013-01-01

    Una opción sin precedentes para la ecorregión cafetera, es la creación de sinergias entre economía verde y economía del conocimiento, para desarrollar ventajas competitivas a partir del medio tropical andino biodiverso y del carácter triétnico de su población, desde las instituciones científicas e importantes universidades que hacen presencia en este territorio conurbado.

  14. Lava flow hazard at Fogo Volcano, Cabo Verde, before and after the 2014-2015 eruption

    OpenAIRE

    Richter, Nicole; Favalli, Massimiliano; de Zeeuw-van Dalfsen, Elske; Fornaciai, Alessandro; Silva Fernandes, Rui Manuel; Pérez, Nemesio M.; Levy, Judith; Victória, Sónia Silva; Thomas R. Walter

    2016-01-01

    Lava flow simulations help to better understand volcanic hazards and may assist emergency preparedness at active volcanoes. We demonstrate that at Fogo Volcano, Cabo Verde, such simulations can explain the 2014–2015 lava flow crisis and therefore provide a valuable base to better prepare for the next inevitable eruption. We conducted topographic mapping in the field and a satellite-based remote sensing analysis. We produced the first topographic model of the 2014&ndash...

  15. Insecticide susceptibility of Aedes aegypti populations from Senegal and Cape Verde Archipelago

    OpenAIRE

    Dia Ibrahima; Diagne Cheikh; Ba Yamar; Diallo Diawo; Konate Lassana; Diallo Mawlouth

    2012-01-01

    Abstract Background Two concomitant dengue 3 (DEN-3) epidemics occurred in Cape Verde Archipelago and Senegal between September and October 2009. Aedes aegypti was identified as the vector of these epidemics as several DEN-3 virus strains were isolated from this species in both countries. The susceptibility to pyrethroids, organochlorine, organophosphates and carbamate was investigated in two field strains of Aedes aegypti from both countries using WHO diagnostic bioassay kits in order to mon...

  16. Potencial del techo verde, para ahorrar electricidad por aire acondicionado en la edificación

    Directory of Open Access Journals (Sweden)

    Ruber Trujillo Samayoa

    2015-01-01

    Full Text Available Introducción: Tanto en México como en el mundo, más de tres cuartas partes de los insumos que se usan en la producción de electricidad provienen de fuentes no renovables, en una realidad donde los techos de las edificaciones son responsables de un consumo importante de electricidad por aire acondicionado. Por lo anterior, el objetivo fue evaluar el aspecto térmico y la eficiencia en el consumo de electricidad de dos aires acondicionados colocados, bajo el Techo de concreto reforzado y el Techo verde, y a la vez utilizar a la geometría analítica como herramienta de análisis en el consumo de electricidad. Método: Aunque inicialmente la metodología de la climatología dinámica, fue desarrollada para el análisis térmico, en este trabajo se retomó para aplicarlo al consumo eléctrico y conjuntándolo con el apoyo de la geometría analítica, a través de ecuaciones de recta que representan promedios anuales, se evidenció las diferencias en el consumo. Resultados: Los resultados obtenidos demuestran que el Techo verde amortigua mejor las temperaturas exteriores, reduce la oscilación térmica y; en el consumo eléctrico, con una diferencia promedio anual de un 28%, el Techo Verde consumió menos energía eléctrica por aire acondicionado. Discusión o conclusión: Se demuestra que conviene el uso de techos verdes en el sitio de estudio y posibilita su aplicación en otros contextos. El trabajo se realizó en periodos de temperaturas extremas opuestas, invierno de 2014 y primavera de 2015.

  17. Las compras verdes. Enfoque ambiental en la contratación pública

    OpenAIRE

    Romero-Pérez, Jorge Enrique

    2008-01-01

    En la contratación pública, estatal, administrativa se incorpora el enfoque ambiental para los efectos de que el Estado cumpla con su deber de proteger la naturaleza, siendo un consumidor de bienes y servicios destinados a su función pública, teniendo presente los parámetros ambientales. Por ello es que se ha divulgado este enfoque como las compras o adquisiciones verdes de parte de la Administración pública.

  18. Insecticide susceptibility of Aedes aegypti populations from Senegal and Cape Verde Archipelago

    Directory of Open Access Journals (Sweden)

    Dia Ibrahima

    2012-10-01

    Full Text Available Abstract Background Two concomitant dengue 3 (DEN-3 epidemics occurred in Cape Verde Archipelago and Senegal between September and October 2009. Aedes aegypti was identified as the vector of these epidemics as several DEN-3 virus strains were isolated from this species in both countries. The susceptibility to pyrethroids, organochlorine, organophosphates and carbamate was investigated in two field strains of Aedes aegypti from both countries using WHO diagnostic bioassay kits in order to monitor their the current status of insecticide susceptibility. Findings The two tested strains were highly resistant to DDT. The Cape Verde strain was found to be susceptible to all others tested insecticides except for propoxur 0.1%, which needs further investigation. The Dakar strain was susceptible to fenitrothion 1% and permethrin 0.75%, but displayed reduced susceptibility to deltamethrin, lambda-cyhalothrin and propoxur. Conclusions As base-line results, our observations stress a careful management of insecticide use for the control of Ae. aegypti. Indeed, they indicate that DDT is no longer efficient for the control of Ae. aegypti populations in Cape Verde and Dakar and further suggest a thorough follow-up of propoxur susceptibility status in both sites and that of deltamethrin and lambda-cyhalothrin in Ae. aegypti populations in Dakar. Thus, regular monitoring of susceptibility is greatly needed as well as the knowing if this observed resistance/susceptibility is focal or not and for observed resistance, the use of biochemical methods is needed with detailed comparison of resistance levels over a large geographic area. Keywords Aedes aegypti, Insecticides, Susceptibility, Cape Verde, Senegal

  19. Risk-based inservice testing program modifications at Palo Verde nuclear generating station

    Energy Technology Data Exchange (ETDEWEB)

    Knauf, S.; Lindenlaub, B.; Linthicum, R.

    1996-12-01

    Arizona Public Service Company (APS) is investigating changes to the Palo Verde Inservice Testing (IST) Program that are intended to result in the reduction of the required test frequency for various valves in the American Society of Mechanical Engineers (ASME) Section XI IST program. The analytical techniques employed to select candidate valves and to demonstrate that these frequency reductions are acceptable are risk based. The results of the Palo Verde probabilistic risk assessment (PRA), updated in June 1994, and the risk significant determination performed as part of the implementation efforts for 10 CFR 50.65 (the maintenance rule) were used to select candidate valves for extended test intervals. Additional component level evaluations were conducted by an `expert panel.` The decision to pursue these changes was facilitated by the ASME Risk-Based Inservice Testing Research Task Force for which Palo Verde is participating as a pilot plant. The NRC`s increasing acceptance of cost beneficial licensing actions and risk-based submittals also provided incentive to seek these changes. Arizona Public Service is pursuing the risk-based IST program modification in order to reduce the unnecessary regulatory burden of the IST program through qualitative and quantitative analysis consistent with maintaining a high level of plant safety. The objectives of this project at Palo Verde are as follows: (1) Apply risk-based technologies to IST components to determine their risk significance (i.e., high or low). (2) Apply a combination of deterministic and risk-based methods to determine appropriate testing requirements for IST components including improvement of testing methods and frequency intervals for high-risk significant components. (3) Apply risk-based technologies to high-risk significant components identified by the {open_quotes}expert panel{close_quotes} and outside of the IST program to determine whether additional testing requirements are appropriate.

  20. A cor verde do endosperma do café On the green color of coffee endosperm

    Directory of Open Access Journals (Sweden)

    Paulo Mazzafera

    1988-01-01

    Full Text Available Realizaram-se comparações entre as sementes dos cultivares Mundo Novo de Coffea arabica, cujo endosperma é verde, com as do cultivar Cera, dessa espécie, de endosperma amarelo, com o objetivo de determinar os componentes responsáveis por aquela cor. Nas análises de clorofilas, flavonóides, diterpenos totais, ácido clorogênico e íons Mg, Ca, K, Fe e B, nenhuma diferença foi verificada entre os dois cultivares, sugerindo que a coloração verde se deva à presença de outros componentes ou que o 'Cera' apresente um componente que não ocorre no 'Mundo Novo' e que inibe o desenvolvimento da cor verde no seu endosperma.A comparison was made between the green seeded Mundo Novo and the yellow seeded Cera cultivars of Coffea arabica, in order to determine the components responsible for the green color of the endosperm. Both cultivars produce beverage of good quality. Chlorophylls, flavonoids, total diterpens, chlorogenic acid, and K, Ca, Mg, Fe and B ions were determined in beans of both cultivars. No differences between cultivars were found on these component contents, what suggests that the green color may be due to other compounds or that the Cera endosperm may have an inhibitor component of the green color of the coffee beans.

  1. Improving Access to Pediatric Cardiology in Cape Verde via a Collaborative International Telemedicine Service.

    Science.gov (United States)

    Lapão, Luís Velez; Correia, Artur

    2015-01-01

    This paper addresses the role of international telemedicine services in supporting the evacuation procedures from Cape Verde to Portugal, enabling better quality and cost reductions in the management of the global health system. The Cape Verde, as other African countries, health system lacks many medical specialists, like pediatric cardiologists, neurosurgery, etc. In this study, tele-cardiology shows good results as diagnostic support to the evacuation decision. Telemedicine services show benefits while monitoring patients in post-evacuation, helping to address the lack of responsive care in some specialties whose actual use will help save resources both in provision and in management of the evacuation procedures. Additionally, with tele-cardiology collaborative service many evacuations can be avoided whereas many cases will be treated and followed locally in Cape Verde with remote technical support from Portugal. This international telemedicine service enabled more efficient evacuations, by reducing expenses in travel and housing, and therefore contributed to the health system's improvement. This study provides some evidence of how important telemedicine really is to cope with both the geography and the shortage of physicians.

  2. Psychosocial concomitants of loneliness among students of Cape Verde and Portugal.

    Science.gov (United States)

    Neto, F; Barros, J

    2000-09-01

    This research is an examination of the relationship between loneliness and a number of psychosocial variables (e.g., affective state, cultural issues, gender, age) among adolescents and young adults from Cape Verde and Portugal. Two studies are presented. The participants in the first study were 285 adolescents from Cape Verde and 202 from Portugal, and in the second study there were 134 college students from Cape Verde and 112 from Portugal. The following instruments were administered to all the participants in both studies: The Revised UCLA Loneliness Scale (D. Russell, L. Peplau, & C. Cutrona, 1980), the Neuroticism Scale (J. Barros, 1999), the Optimism Scale (J. Barros, 1998), the Social Anxiety subscale (A. Fenigstein, M. Scheier, & A. Buss, 1975), and the Satisfaction With Life Scale (E. Diener, R. Emmons, R. Larsen, & S. Griffin, 1985). No ethnic or gender differences were found for loneliness between the two groups. For both groups, the most prominent predictors of loneliness were neuroticism and dissatisfaction with life. However, as expected, the adolescent group recorded higher scores for loneliness than did the college students.

  3. Biologia de ninfas e adultos do percevejo-verde em estruturas reprodutivas de algodoeiro

    Directory of Open Access Journals (Sweden)

    Rosalia Azambuja

    2014-06-01

    Full Text Available O objetivo deste trabalho foi determinar a biologia de ninfas e adultos do percevejo-verde em estruturas reprodutivas do algodoeiro. Os alimentos testados foram: dieta padrão, contendo vagem de feijão, amendoim cru e frutos de ligustro; vagem verde de soja; semente de soja; botão floral de algodoeiro; e maçãs e sementes de algodoeiro. Foram avaliados os parâmetros biológicos: período de desenvolvimento e sobrevivência ninfal; longevidade de fêmeas e machos; percentagem de fêmeas em oviposição; períodos de pré-oviposição e oviposição; número total de ovos por fêmea; e viabilidade dos ovos. Ninfas alimentadas com estruturas reprodutivas do algodoeiro morreram no segundo ou no terceiro ínstar. Adultos alimentados com botão floral e semente de algodoeiro não se reproduzem; porém, há reprodução quando adultos os de percevejo-verde são alimentados com maçã de algodoeiro, o que indica a capacidade de adaptação da espécie na fase reprodutiva do algodoeiro.

  4. Origin of the springs of Costa Verde beach in Lima Peru

    CERN Document Server

    Rojas, Ruben; Mamani, Enoc; Maguina, Jose; Montoya, Eduardo; Baltuano, Oscar; Bedregal, Patricia; Coria, Lucy; Guerra, Alcides; Justo, Santiago; Churasacari, Tania

    2013-01-01

    This paper tries to determine the origin of springs on the Costa Verde beach, located in the district of Barranco, Miraflores and Magdalena, province of Lima, Peru. These springs emerge near the shoreline, from the lower layers of a 80 meter high cliff. They have survived the process of urbanization of agricultural land, started in the early 70, which decreased the water table aquifer of Lima, and wiped the water leaks from the cliffs. To identify the source of the springs, isotopic, physical, chemical and bacteriological analysis was carried out for samples from five springs. The isotopic concentrations in waters from Costa Verde springs are depleted compared to those obtained for Lima aquifer waters, which is recharged by infiltration of the Rimac River. The measured values of those concentrations suggest that water from the Costa Verde springs should come from a direct recharge in the upper and middle basin, due to infiltration of rainfall or the river at an altitude of about 3600 m. Conductivity and tempe...

  5. Impact of Sahara dust transport on Cape Verde atmospheric element particles.

    Science.gov (United States)

    Almeida-Silva, M; Almeida, S M; Freitas, M C; Pio, C A; Nunes, T; Cardoso, J

    2013-01-01

    The objectives of this study were to (1) conduct an elemental characterization of airborne particles sampled in Cape Verde and (2) assess the influence of Sahara desert on local suspended particles. Particulate matter (PM(10)) was collected in Praia city (14°94'N; 23°49'W) with a low-volume sampler in order to characterize its chemical composition by k0-INAA. The filter samples were first weighed and subsequently irradiated at the Portuguese Research Reactor. Results showed that PM(10) concentrations in Cape Verde markedly exceeded the health-based air quality standards defined by the European Union (EU), World Health Organization (WHO), and U.S. Environmental Protection Agency (EPA), in part due to the influence of Sahara dust transport. The PM(10) composition was characterized essentially by high concentrations of elements originating from the soil (K, Sm, Co, Fe, Sc, Rb, Cr, Ce, and Ba) and sea (Na), and low concentrations of anthropogenic elements (As, Zn, and Sb). In addition, the high concentrations of PM measured in Cape Verde suggest that health of the population may be less affected compared with other sites where PM(10) concentrations are lower but more enriched with toxic elements.

  6. Marketing verde e práticas socioambientais nas indústrias do Paraná

    Directory of Open Access Journals (Sweden)

    Valéria Neder Lopes

    2014-03-01

    Full Text Available A preocupação das empresas com o meio ambiente e com todas as questões sociais envolvidas em seu processo tem se tornado uma constante nos últimos tempos. Devido a isso, estão surgindo novas formas de administrar os recursos disponíveis. Nesse contexto, enquadra-se o marketing verde que deve estar pautado em práticas ambientalmente corretas, com o intuito de gerar produtos e serviços mais sustentáveis, fortalecendo a imagem das empresas e diferenciando suas marcas no mercado. O intuito neste trabalho foi verificar se as grandes indústrias do Paraná estão se utilizando das práticas de marketing verde e se mantêm projetos de gestão socioambiental. Para atender a tais objetivos, elaborou-se uma pesquisa descritiva e quantitativa com 48 grandes empresas cadastradas na Federação das Indústrias do Paraná. Os resultados obtidos indicam que a maior parte das empresas possui departamento de marketing formalizado, mantém sistemas de gestão ambiental e utiliza moderadamente práticas de marketing verde.

  7. Abundancia de juveniles de camarones peneidos comerciales en la zona norte de Laguna Madre, México Abundance of the commercial penaeid shrimp juveniles in the North zone of Laguna Madre, Mexico

    OpenAIRE

    Armando T. Wakida-Kusunoki; Leobardo García-Solorio; Norma Gloria Vázquez Benavides

    2008-01-01

    Se tomaron muestras mensuales de agosto del 2005 a noviembre del 2006, para analizar los cambios de abundancia de juveniles de camarones peneidos comerciales en la parte norte de Laguna Madre, Tamaulipas. En cada una de las nueve estaciones de muestreo se realizó un arrastre nocturno, utilizando una red tipo chinchorro, de tamaño de malla de 1.25 cm y seis metros de longitud de relinga inferior. Se observaron tres especies de peneidos comerciales y cada una de ellas tuvo sus valores más altos...

  8. Nutrientes y productividad primaria fitoplanctónica en una laguna costera tropical intermitente (La Mancha,Ver.) del Golfo de México

    OpenAIRE

    Francisco Contreras Espinosa; Nadia E. Rivera Guzmán; Raquel Segura Aguilar

    2005-01-01

    En el caso de la laguna de La Mancha, el efecto de la apertura de la boca implica que la laguna pierda, a lo largo de este período (157 días) 1’148,400 m3 de su volumen original; cuando la boca se cierra, el incremento de agua hacia el interior del sistema se calcula en aproximadamente 950,400 m3 alcanzando 1’ 663,200 m3. Cuando la laguna permaneció comunicada con el mar (del 23 de junio al 25 de noviembre), los parámetros medidos mostraron las siguientes medianas: la salinidad de 22.0 ups, e...

  9. Microbiological quality of chicken- and pork-based street-vended foods from Taichung, Taiwan, and Laguna, Philippines.

    Science.gov (United States)

    Manguiat, Lydia S; Fang, Tony J

    2013-10-01

    The microbiological quality of chicken- and pork-based street-food samples from Taichung, Taiwan's night markets (50) and Laguna, Philippines' public places (69) was evaluated in comparison to a microbiological guideline for ready-to-eat foods. Different bacterial contamination patterns were observed between 'hot-grilled' and 'cold cooked/fried' food types from the two sampling locations with 'hot grilled' foods generally showing better microbiological quality. Several samples were found to be unsatisfactory due to high levels of aerobic plate count, coliform, Escherichia coli, and Staphylococcus aureus. The highest counts obtained were 8.2 log cfu g⁻¹, 5.4 log cfu g⁻¹, 4.4 log cfu g⁻¹, and 3.9 log cfu g⁻¹, respectively, suggesting poor food hygiene practices and poor sanitation. Salmonella was found in 8% and 7% of Taichung and Laguna samples, respectively, which made the samples potentially hazardous. None of the samples was found to be positive for Listeria monocytogenes and E. coli O157, but Bacillus cereus was detected at the unsatisfactory level of 4 log cfu g⁻¹ in one Laguna sample. Antimicrobial resistance was observed for Salmonella, E. coli, and S. aureus isolates. Food preparation, cooking, and food handling practices were considered to be contributors to the unacceptable microbiological quality of the street foods. Hence, providing training on food hygiene for the street vendors should result in the improvement of the microbiological quality of street foods. The data obtained in this study can be used as input to microbial risk assessments and in identifying science-based interventions to control the hazards.

  10. Field reconnaissance of the effects of the earthquake of April 13, 1973, near Laguna de Arenal, Costa Rica

    Science.gov (United States)

    Plafker, George

    1973-01-01

    At about 3:34 a.m. on April 13, 1973, a moderate-sized, but widely-felt, earthquake caused extensive damage with loss of 23 lives in a rural area of about 150 km2 centered just south of Laguna de Arenal in northwestern Costa Rica (fig. 1). This report summarizes the results of the writer's reconnaissance investigation of the area that was affected by the earthquake of April 13, 1973. A 4-day field study of the meizoseismal area was carried out during the period from April 28 through May 1 under the auspices of the U.S. Geological Survey. The primary objective of this study was to evaluate geologic factors that contributed to the damage and loss of life. The earthquake was also of special interest because of the possibility that it was accompanied by surface faulting comparable to that which occurred at Managua, Nicaragua, during the disastrous earthquake of December 23, 1972 (Brown, Ward, and Plafker, 1973). Such earthquake-related surface faulting can provide scientifically valuable information on active tectonic processes at shallow depths within the Middle America arc. Also, identification of active faults in this area is of considerable practical importance because of the planned construction of a major hydroelectrical facility within the meizoseismal area by the Instituto Costarricense de Electricidad (I.C.E.). The project would involve creation of a storage reservoir within the Laguna de Arenal basin and part of the Río Arenal valley with a 75 m-high earthfill dam across Río Arenal at a point about 10 km east of the outlet of Laguna de Arenal.

  11. Origin and evolution of the Laguna Potrok Aike maar (Southern Patagonia, Argentina) as revealed by seismic data

    Science.gov (United States)

    Gebhardt, C.; de Batist, M. A.; Niessen, F.; Anselmetti, F.; Ariztegui, D.; Haberzettl, T.; Ohlendorf, C.; Zolitschka, B.

    2009-12-01

    Seismic reflection and refraction data provide insights into the sedimentary infill and the underlying volcanic structure of Laguna Potrok Aike, a maar lake situated in the Pali Aike Volcanic Field, Southern Patagonia. The lake has a diameter of ~3.5 km, a maximum water depth of ~100 m and a presumed age of ~770 ka. Its sedimentary regime is influenced by climatic and hydrologic conditions related to the Antarctic Circumpolar Current, the Southern Hemispheric Westerlies and sporadic outbreaks of Antarctic polar air masses. Multiproxy environmental reconstructions of the last 16 ka document that this terminal lake is highly sensitive to climate change. Laguna Potrok Aike has recently become a major focus of the International Continental Scientific Drilling Program and was drilled down to 100 m below lake floor in late 2008 within the PASADO project. The sediments are likely to contain a continental record spanning the last ca. 80 kyrs unique in the South American realm. Seismic reflection data show relatively undisturbed, stratified lacustrine sediments at least in the upper ~100 m of the sedimentary infill but are obscured possibly by gas and/or coarser material in larger areas. A model calculated from seismic refraction data reveals a funnel-shaped structure embedded in the sandstone rocks of the surrounding Santa Cruz Formation. This funnel structure is filled by lacustrine sediments of up to 370 m in thickness. These can be separated into two distinct subunits with low acoustic velocities of 1500-1800 m s-1 in the upper subunit pointing at unconsolidated lacustrine muds, and enhanced velocities of 2000-2350 m s-1 in the lower subunit. Below these lacustrine sediments, a unit of probably volcanoclastic origin is observed (>2400 m s-1). This sedimentary succession is well comparable to other well-studied sequences (e.g. Messel and Baruth maars, Germany), confirming phreatomagmatic maar explosions as the origin of Laguna Potrok Aike.

  12. Lithologic controls on mineralization at the Lagunas Norte high-sulfidation epithermal gold deposit, northern Peru

    Science.gov (United States)

    Cerpa, Luis M.; Bissig, Thomas; Kyser, Kurt; McEwan, Craig; Macassi, Arturo; Rios, Hugo W.

    2013-06-01

    The 13.1-Moz high-sulfidation epithermal gold deposit of Lagunas Norte, Alto Chicama District, northern Peru, is hosted in weakly metamorphosed quartzites of the Upper Jurassic to Lower Cretaceous Chimú Formation and in overlying Miocene volcanic rocks of dacitic to rhyolitic composition. The Dafne and Josefa diatremes crosscut the quartzites and are interpreted to be sources of the pyroclastic volcanic rocks. Hydrothermal activity was centered on the diatremes and four hydrothermal stages have been defined, three of which introduced Au ± Ag mineralization. The first hydrothermal stage is restricted to the quartzites of the Chimú Formation and is characterized by silice parda, a tan-colored aggregate of quartz-auriferous pyrite-rutile ± digenite infilling fractures and faults, partially replacing silty beds and forming cement of small hydraulic breccia bodies. The δ34S values for pyrite (1.7-2.2 ‰) and digenite (2.1 ‰) indicate a magmatic source for the sulfur. The second hydrothermal stage resulted in the emplacement of diatremes and the related volcanic rocks. The Dafne diatreme features a relatively impermeable core dominated by milled slate from the Chicama Formation, whereas the Josefa diatreme only contains Chimú Formation quartzite clasts. The third hydrothermal stage introduced the bulk of the mineralization and affected the volcanic rocks, the diatremes, and the Chimú Formation. In the volcanic rocks, classic high-sulfidation epithermal alteration zonation exhibiting vuggy quartz surrounded by a quartz-alunite and a quartz-alunite-kaolinite zone is observed. Company data suggest that gold is present in solid solution or micro inclusions in pyrite. In the quartzite, the alteration is subtle and is manifested by the presence of pyrophyllite or kaolinite in the silty beds, the former resulting from relatively high silica activities in the fluid. In the quartzite, gold mineralization is hosted in a fracture network filled with coarse alunite

  13. TECHOS VERDES COMO SOLUCIÓN AL PROBLEMA DE INUNDACIONES EN MEDIOS URBANOS

    Directory of Open Access Journals (Sweden)

    López, N.

    2015-12-01

    Full Text Available El presente trabajo de investigación se realizó empleando modelos matemáticos, con la finalidad de comparar la escorrentía producida en un urbanismo con condiciones actuales de techos de tejas criollas, contra otro donde se usan estructuras o dispositivos de almacenamiento y retención de agua en casas, patios, parcelas, calles y contra urbanismos en general. Se seleccionó una zona de estudio en el Estado Lara (Venezuela, en el municipio Palavecino, en las inmediaciones de la Quebrada Tabure, considerando los techos verdes desde el punto de vista de reductores de escorrentía. Se elaboró una aplicación llamada “TechosVerdes.py” en el programa de licencia libre Python, con aproximadamente 4600 líneas de código para calcular los hidrogramas de los techos, patios, calles y áreas verdes, basándose en un mosaico creado con imágenes tipo raster en el programa Quantum Gis. La investigación se basó en la comparación directa de trece escenarios hipotéticos, donde se utilizó techos verdes y adicionalmente, tanques de almacenamiento y brocales, con un escenario original en condiciones actuales, sin alteraciones. Se obtuvo como resultado en los hidrogramas calculados para los escenarios hipotéticos, que el caudal pico disminuye, achatándose el hidrograma. This research was carried out using mathematical models in order to compare the runoff from an urban planning with handmade tiles roofs in actual conditions, with one where structures or storage devices and water retention in houses, yards are used, parcels, streets and housing complexes in general. A study area in the state of Lara, Venezuela, in Palavecino municipality, near Quebrada Tabure, was selected and green roofs are considered from the point of view of reducing runoff. An application called "TechosVerdes.py" was made under the license free Python program with approximately 4600 code lines was developed to calculate hydrographs from roofs, patios, streets and green areas

  14. La docencia del área de Toxicología de la Universidad de La Laguna

    OpenAIRE

    A. J. Gutiérrez Fernández; C Rubio Armendáriz; G. Luis González; C Hernández Sánchez; D. González- Weller; J. M. Caballero Mesa; A. Hardisson de la Torre

    2012-01-01

    La docencia de Toxicología en la Universidad de La Laguna (ULL) se integra en diversas Licenciaturas y Grados tales como Farmacia, Ciencia y Tecnología de los Alimentos (CTA), Medicina, Náutica y Transporte Marítimo y el Máster Oficial de Seguridad y Calidad de los Alimentos. En la Licenciatura de Farmacia en la ULL, el Área de Toxicología imparte la asignatura troncal Toxicología de 7 créditos y dos asignaturas optativas, Drogodependencias y Toxicología Clínica y Laboral, de 4,5 créditos...

  15. The LAGUNA design study-towards giant liquid based underground detectors for neutrino physics and astrophysics and proton decay searches

    CERN Document Server

    Angus, D; Autiero, D.; Apostu, A.; Badertscher, A.; Bennet, T.; Bertola, G.; Bertola, P.F.; Besida, O.; Bettini, A.; Booth, C.; Borne, J.L.; Brancus, I.; Bujakowsky, W.; Campagne, J.E.; Danil, G.Cata; Chipesiu, F.; Chorowski, M.; Cripps, J.; Curioni, A.; Davidson, S.; Declais, Y.; Drost, U.; Duliu, O.; Dumarchez, J.; Enqvist, T.; Ereditato, A.; von Feilitzsch, F.; Fynbo, H.; Gamble, T.; Galvanin, G.; Gendotti, A.; Gizicki, W.; Goger-Neff, M.; Grasslin, U.; Gurney, D.; Hakala, M.; Hannestad, S.; Haworth, M.; Horikawa, S.; Jipa, A.; Juget, F.; Kalliokoski, T.; Katsanevas, S.; Keen, M.; Kisiel, J.; Kreslo, I.; Kudryastev, V.; Kuusiniemi, P.; Labarga, L.; Lachenmaier, T.; Lanfranchi, J.C.; Lazanu, I.; Lewke, T.; Loo, K.; Lightfoot, P.; Lindner, M.; Longhin, A.; Maalampi, J.; Marafini, M.; Marchionni, A.; Margineanu, R.M.; Markiewicz, A.; Marrodan-Undagoita, T.; Marteau, J.E.; Matikainen, R.; Meindl, Q.; Messina, M.; Mietelski, J.W.; Mitrica, B.; Mordasini, A.; Mosca, L.; Moser, U.; Nuijten, G.; Oberauer, L.; Oprina, A.; Paling, S.; Pascoli, S.; Patzak, T.; Pectu, M.; Pilecki, Z.; Piquemal, F.; Potzel, W.; Pytel, W.; Raczynski, M.; Rafflet, G.; Ristaino, G.; Robinson, M.; Rogers, R.; Roinisto, J.; Romana, M.; Rondio, E.; Rossi, B.; Rubbia, A.; Sadecki, Z.; Saenz, C.; Saftoiu, A.; Salmelainen, J.; Sima, O.; Slizowski, J.; Slizowski, K.; Sobczyk, J.; Spooner, N.; Stoica, S.; Suhonen, J.; Sulej, R.; Szarska, M.; Szeglowski, T.; Temussi, M.; Thompson, J.; Thompson, L.; Trzaska, W.H.; Tippmann, M.; Tonazzo, A.; Urbanczyk, K.; Vasseur, G.; Williams, A.; Winter, J.; Wojutszewska, K.; Wurm, M.; Zalewska, A.; Zampaolo, M.; Zito, M.

    2010-01-01

    The feasibility of a next generation neutrino observatory in Europe is being considered within the LAGUNA design study. To accommodate giant neutrino detectors and shield them from cosmic rays, a new very large underground infrastructure is required. Seven potential candidate sites in different parts of Europe and at several distances from CERN are being studied: Boulby (UK), Canfranc (Spain), Fr\\'ejus (France/Italy), Pyh\\"asalmi (Finland), Polkowice-Sieroszowice (Poland), Slanic (Romania) and Umbria (Italy). The design study aims at the comprehensive and coordinated technical assessment of each site, at a coherent cost estimation, and at a prioritization of the sites within the summer 2010.

  16. Lesiones causadas por helmintos del aparato digestivo en peces estuarinos de la Laguna Tres Palos, Guerrero, México

    OpenAIRE

    Ramón Vázquez Núñez; José Ramírez Lezama; David Osorio Sarabia; Larisa Adriana Chávez Soriano; Fernando Constantino Casas

    2004-01-01

    Se realizó el presente estudio con el fi n de identificar y comparar las lesiones macro y microscópicas asociadas a helmintos en el tracto digestivo del Ariopsis guatemalensis (“cuatete”) y Eleotris picta (“alahuate”) de la Laguna de Tres Palos, Guerrero, México. En Mayo, Julio y Diciembre del 2001 se colectaron 30 peces de cada especie. A 15 individuos de cada muestra se les practicó el examen histopatológico y a los 15 restantes el examen parasitológico. Se identifi caron tres grupos de hel...

  17. Producción espacial y temporal de hojarasca del manglar en la laguna Barra de Navidad, Jalisco, México

    OpenAIRE

    Mendoza-Morales, Alma J.; González-Sansón, Gaspar; Aguilar-Betancourt, Consuelo

    2016-01-01

    La laguna de Barra de Navidad es un humedal costero de importancia internacional (sitio RAMSAR) y está incluida entre los 81 sitios prioritarios de manglar de México. Una de las características de mayor valor de la laguna, es la presencia de bosques de mangle en buen estado de conservación. El objetivo de nuestro trabajo, fue medir la producción de hojarasca del manglar y los factores ambientales que pueden influir en su dinámica. El manglar fue dividido en siete zonas y las recolectas de hoj...

  18. Nuove ricerche subacquee nella laguna di Santa Giusta (OR (campagna del 2009-2010

    Directory of Open Access Journals (Sweden)

    Carla Del Vais

    2012-07-01

    Full Text Available Le ricerche avviate nel 2005 nella laguna di Santa Giusta (OR stanno rivelando la presenza di contesti archeologici di età fenicio-punica di eccezionale rilevanza. In uno di questi, localizzato a circa 800 m dall’attuale linea di riva, è stato condotto, a partire dal 2006, uno scavo subacqueo, ancora in corso. Sono stati recuperati numerosi materiali ceramici, in larga parte rappresentati da anfore commerciali, ma anche da ceramica domestica e, più raramente, di carattere funerario e cultuale (VI-III/II sec. a.C.. In vari casi le anfore contenevano resti ossei animali, più spesso di ovicaprini, con evidenti tracce di macellazione; le condizioni anossiche garantite dal substrato limoso hanno favorito la conservazione di materiali organici, tra i quali pigne, semi di diverse specie e legni, prevalentemente lavorati, alcuni ancora in connessione. Research undertaken in 2005 in the lagoon of Santa Giusta (OR is revealing the presence of archaeological contexts of Phoenician-Punic date of exceptional importance. In one of these, located about 800 m from the current shoreline, an underwa­ter excavation was conducted since 2006; it is still in progress. Much pottery has been recovered, mostly represented by transport amphoras, but also by domestic pottery and, more rarely, ceramics associated with funerary and cultic use (6th-2nd century BC. In several cases the amphoras contained animal remains, most often of ovicaprines, with clear traces of slaughter; the anaerobic condi­tions guaranteed by the silty substrate have favoured the preservation of organic materials, including pine cones, seeds of different species and wood, mostly worked and some still joined together.

  19. El uso hegemónico del agua en la laguna Chignahuapan 1940-1969

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    María Verónica Ibarra García

    2010-01-01

    Full Text Available Este artículo analiza los cambios en el uso predominante del agua, desde la geografía política, en los municipios de Almoloya del Río, San Mateo Texcalyacac y Santa Cruz Atizapan, localizados en la cuenca alta del Lerma, básicamente de los años cuarenta a los sesenta del siglo XX. Serán considerados elementos sociales, económicos y políticos que definen las condiciones de la naturaleza, esta propuesta crítica de la geografía política, se desarrolla en oposición a las vertientes de la naturaleza prístina, en contraste con esta corriente, planteamos el problema del uso-apropiación del agua como una segunda naturaleza, para la cual las relaciones de poder y el modelo de sustitución de importaciones y la consecuente urbanización e industrialización exigen la extracción y trasvase del agua de la cuenca alta de Lerma a la ciudad de México. La parcial desecación de la laguna de Chignahuapan es la manifestación ambiental de una forma de apropiación y uso del agua que responde a un modelo de desarrollo, con intereses precisos que iniciaron la producción del espacio nacional, dentro del sistema capitalista mexicano bajo un régimen político autoritario.

  20. The Laguna Potrok Aike Scientific Drilling Project PASADO (ICDP Expedition 5022

    Directory of Open Access Journals (Sweden)

    Pierre Francus

    2009-09-01

    Full Text Available In the Southern Hemisphere long, continuous, and high-resolution series of terrestrial paleoclimatic data are scarce, and they are only slowly emerging. Globally speaking, the most extreme oceanic character is encountered between 40°S and 60°S (Fig. 1. In this latitudinal belt ninety-eight percent of water is juxtaposed to only two percent of land—Patagonia and a few sub-Antarctic islands. Therefore, records from Patagonia are a key to a better evaluation ofinter-hemispheric linkages and differences in the climate system, especially as the Southern Ocean plays a key role for a proper understanding of the global climate system (Kaiser et al., 2007. Moreover, this region—close to the Andean volcanic chain—is one of the source regions for southern hemispheric dust. It is also subject to shifts in polar to mid-latitude pressure fields and precipitation regimes related to the Southern Hemispheric Westerlies and the Antarctic Oscillation. Patagonia thus potentially provides uniqueterrestrial records of variations in (1 climate, (2 hydrology, (3 erosion and deposition of atmospheric dust, and (4 volcanic activity. Additionally, links can be established to ice cores from Antarctica and to marine records from the South Atlantic where dust and tephra of Patagonian provenance have been deposited (Ackert, 2009; Narcisi et al., 2005; Sugden et al., 2009. For southernmost South America most lake sediments extend in time not beyond theLate-Glacial. However, Laguna Potrok Aike (Fig. 1 is older than the numerous Patagonian glacial lakes and offers the opportunity for volcanological studies.

  1. Dynamics of a large, restless, rhyolitic magma system at Laguna del Maule, southern Andes, Chile

    Science.gov (United States)

    Singer, Brad S.; Andersen, Nathan L.; Le Mével, Hélène; Feigl, Kurt L.; DeMets, Charles; Tikoff, Basil; Thurber, Clifford H.; Jicha, Brian R.; Cardonna, Carlos; Córdova, Loreto; Gil, Fernando; Unsworth, Martyn J.; Williams-Jones, Glyn; Miller, Craig W.; Fierstein, Judith; Hildreth, Edward; Vazquez, Jorge A.

    2014-01-01

    Explosive eruptions of large-volume rhyolitic magma systems are common in the geologic record and pose a major potential threat to society. Unlike other natural hazards, such as earthquakes and tsunamis, a large rhyolitic volcano may provide warning signs long before a caldera-forming eruption occurs. Yet, these signs—and what they imply about magma-crust dynamics—are not well known. This is because we have learned how these systems form, grow, and erupt mainly from the study of ash flow tuffs deposited tens to hundreds of thousands of years ago or more, or from the geophysical imaging of the unerupted portions of the reservoirs beneath the associated calderas. The Laguna del Maule Volcanic Field, Chile, includes an unusually large and recent concentration of silicic eruptions. Since 2007, the crust there has been inflating at an astonishing rate of at least 25 cm/yr. This unique opportunity to investigate the dynamics of a large rhyolitic system while magma migration, reservoir growth, and crustal deformation are actively under way is stimulating a new international collaboration. Findings thus far lead to the hypothesis that the silicic vents have tapped an extensive layer of crystal-poor, rhyolitic melt that began to form atop a magmatic mush zone that was established by ca. 20 ka with a renewed phase of rhyolite eruptions during the Holocene. Modeling of surface deformation, magnetotelluric data, and gravity changes suggest that magma is currently intruding at a depth of ~5 km. The next phase of this investigation seeks to enlarge the sets of geophysical and geochemical data and to use these observations in numerical models of system dynamics.

  2. Early and mid-Holocene age for the Tempanos moraines, Laguna San Rafael, Patagonian Chile

    Science.gov (United States)

    Harrison, Stephan; Glasser, Neil F.; Duller, Geoff A. T.; Jansson, Krister N.

    2012-01-01

    Data about the nature and timing of Holocene events from the Southern Hemisphere, especially in southern South America, are required to provide insight into the extent and nature of past climate change in a region where land-based records are restricted. Here we present the first use of single grain Optically Stimulated Luminescence (OSL) dating of a moraine sequence recording glacial advance along the western side of the Patagonian Icefields. Dates from the Tempanos moraines at Laguna San Rafael (LSR) show that the San Rafael Glacier (SRG) advanced to maximum Holocene positions during the period 9.3 to 9.7 ka and at 5.7 ka. Outwash lying beneath the moraine in its northern portion, dated to 7.7 ka, indicates that the glacier front was also advanced at this time. Since these advances span both the regional early Holocene warm-dry phase (11.5 ka to 7.8 ka) and the subsequent cooling and rise in precipitation in the mid-late Holocene (since 6.6 ka) we infer that the advances of the SRG are not simply climate-driven, but that the glacier has also probably responded strongly to non-climatic stimuli such as internal ice dynamics and the transition between calving and non-calving. Many westwards-flowing glaciers in Patagonia were probably calving during much of the Late Pleistocene and Holocene, so we conclude that establishing robust glacial chronologies where climatic and non-climatic factors cannot be distinguished is likely to remain a challenge.

  3. Estructura del macrobentos de la laguna de Paca, Junín

    Directory of Open Access Journals (Sweden)

    Pedro Huamán

    2013-06-01

    Full Text Available Se caracterizó la estructura comunitaria del macrobentos de la laguna de Paca ubicada a 3364 msnm, a 11º 45 S y 75º 30’ W en el departamento de Junín-Perú. También se analizaron los principales factores físicos y químicos del agua y sedimentos que condicionan dicha estructura. Los muestreos se realizaron en el año 2000 en 8 estaciones, distribuidas en la zona litoral (5 y pelágica (3. En cada estación se tomaron muestras de agua cercana al fondo y de sedimentos para analizar los parámetros físicos, químicos y biológicos de la comunidad del macrobentos. Los datos fueron sometidos a pruebas univariadas y multivariadas para determinar el grado de interacción de los diversos factores con las variables biológicas. La diversidad del macrobentos es baja y muestra valores de diversidad menores a 1,5 y el número de especies menores a 11 especies. La abundancia varía en valores que van desde los 16 hasta 176 individuos/0,04 m2 . Tubifex tubifex y Chironomus sp. fueron las especies más resistentes a los altos valores de materia orgánica (35,22 a 38,28% y bajos valores de oxígeno disuelto (1 a 2 mg/L, lo que constituye indicadores biológicos de eutroficación.

  4. Uso de lagunas algales de alta tasa para tratamiento de aguas residuales

    Directory of Open Access Journals (Sweden)

    Víctor Alfonso Cerón Hernández

    2015-01-01

    Full Text Available Se han propuesto muchos sistemas para la descontaminación de las aguas residuales domésticas, industriales y lixiviados. Actualmente se espera tratar las aguas residuales y derivar un beneficio económico-ambiental. Es en este contexto que los sistemas algales de alta tasa se propusieron inicialmente para el tratamiento de aguas residuales domésticas. Sin em - bargo, la investigación realizada alrededor de esta tecnología ha mostrado ventajas y beneficios que no se tenían contemplados inicialmente. En la actualidad se están realizando implementaciones en el tratamiento de las aguas residuales, buscando la producción de biocombustibles, bio - masa algal para alimento (animal y humano, la obtención de productos farmacéuticos y la bioprospección de las algas. Adicional a esto, se está investigando sobre la captura y reducción del dióxido de carbono ( CO 2 atmosférico, mecanismos de eliminación de contaminantes específicos y la optimización de la hidrobiología del sistema. Sin embargo, hace falta información sobre la función y la ecología de las algas y la relación alga/ bacteria, efecto del comportamiento hidrodinámico de la laguna sobre la producción algal, el efecto de las variables ambientales del trópico en el desempeño del sistema y el desarrollo de criterios de diseño para zonas tropicales.

  5. Laguna Potrok Aike, Argentina: the first non-tropical environmental record in South America extending far beyond the Late-Glacial - a progress report

    Science.gov (United States)

    Zolitschka, B.; Anselmetti, F.; Ariztegui, D.; Corbella, H.; Francus, P.; Gebhardt, C.; Lücke, A.; Ohlendorf, C.; Schäbitz, F.; Pasado Science Team

    2009-04-01

    Within the framework of the ICDP-funded "Potrok Aike maar lake sediment archive drilling project" (PASADO) an international team of scientists carried out interdisciplinary research at the unique mid-Pleistocene (770 ka) maar lake of Laguna Potrok Aike in southern Patagonia (Province of Santa Cruz, Argentina). This lake is very sensitive to variations in southern hemispheric wind and pressure systems and thus holds a unique and continuous lacustrine record of climatic and ecological variability of global significance. Moreover, Southern Patagonia with its many active volcanoes is an ideal location to better understand the regional history of volcanism. These are two challenging geo-scientific themes that need to be tackled, especially as both of them have an increasing socio-economic relevance. Three months of drilling activities that finished last November 2008 were carried out by DOSECC from the drilling platform R/V "Kerry Kelts". More than 500 m of lacustrine sediments were recovered. This sedimentary archive will provide (1) new insights into the processes of regional back arc volcanism within the Pali Aike Volcanic Field itself as well as the more distant explosive volcanism of the Andean mountain chains; and, (2) high-resolution (decadal) quantitative climate and environmental reconstructions supported by multiple dating and stratigraphic correlations. Marine - ice core - terrestrial linkages will be emphasized as well as the incorporation of results from global climate modelling simulations for the last ca. 100 ka. The two drilled sites in the central deep basin of Laguna Potrok Aike have been selected based on four seismic surveys carried out between 2003 and 2005. Sediments were recovered at both drilled sites down to a subbottom depth of slightly more than 100 m using the GLAD800 drill rig with the hydraulic piston corer tool (HPC) at water depths varying between 95 and 100 m. The total core recovery is 94%. On-site core logging with the multi sensor

  6. Age dependent variation of magnetic fabric on dike swarms from Maio Island (Cape Verde)

    Science.gov (United States)

    Moreira, Mário; Madeira, José; Mata, João.; Represas, Patrícia

    2010-05-01

    Maio is one of the oldest and most eroded islands of Cape Verde Archipelago. It comprises three major geological units: (1) an old raised sea-floor sequence of MORB covered by Jurassic(?)-Cretaceous deep marine sediments; (2) an intrusive 'Central Igneous Complex' (CIC), forming a dome-like structure in the older rocks; and (3) a sequence of initially submarine, then subaerial, extrusive volcanic formations and sediments. Based on the trend distribution of 290 dikes, we performed magnetic sampling on 26 basic and one carbonatite dikes. Anisotropy of magnetic susceptibility (AMS) was measured to infer geometries of magmatic flow. Dikes were sampled in both chilled margins were larger shear acting on particles embedded in the magmatic flow is expected. Sampling involved 11 dikes (N=195) intruding MORB pillows from the Upper Jurassic 'Batalha Formation' (Bt fm); 6 dikes (N=95) intruding the Lower Cretaceous 'Carquejo Formation' (Cq fm), and 10 dikes (N=129) intruding the submarine sequence of the Neogene 'Casas Velhas Formation' (CV fm). The studied hypabissal rocks are usually porphyritic, with phenocrysts of clinopyroxene and/or olivine set on an aphanitic groundmass. Dikes intruding CV fm trend N-S to NE-SW and plunge to SW. In Bt fm, dikes make ≈ 99% of the outcrops, span all directions and include frequent low dip sills. Dikes intruding Cq fm are shallow (mostly parallel to the limestone strata), dip 30o- 40o to the E, and trend N-S to NE-SW. Bulk susceptibility of the 26 basic dikes presents an average value of k = 47 ± 26 (×10-3) SI. The carbonatite dike intruding Bt fm has lower susceptibility: k = 4.6 ± 1.2 (×10-3) SI. More than 80% of the dikes show normal and triaxial magnetic fabric. Anisotropy is usually low, with P' < 1.08, but in CV fm dikes the anisotropy is higher and grows (up to P' ≈ 1.5) towards the centre of the volcano. Dominant magnetic fabric in CV fm is planar but in dikes from Cq fm and Bt fm it varies between oblate and prolate

  7. El proyecto de recuperación de la laguna de La Nava: una iniciativa de éxito

    Directory of Open Access Journals (Sweden)

    Fernando Jubete

    2004-01-01

    Full Text Available La riqueza ornítica de una de las tres lagunas interiores más importantes de España, La Nava, hizo posible que llegaran los fondos necesarios para que en 1990 las aguas de un río volviesen de nuevo a inundar 60 ha de ella. Las obras realizadas en esta primera intervención trataron de anular los desagües de la red de canales y acequias existentes. Posteriormente, las acciones contempladas en un proyecto de la UE incluyeron la compra y arrendamiento de terrenos, trabajos de restauración dentro y fuera del vaso lagunar, actividades de gestión y uso público. El proyecto de recuperación de la Nava ha conseguido regenerar 300 ha de la antigua laguna y está generando unos interesantes recursos económicos directos e indirectos, derivados principalmente del turismo. La actual crisis que está sufriendo el sector agrario, especialmente notoria en la comarca de Tierra de Campos, nos enseña ahora que decisiones políticas tan arriesgadas como la destrucción de un enclave natural tan importante como la Nava deben contar con informes serios y rigurosos sobre cuales son las perspectivas de futuro.

  8. Ang Social Network sa Facebook ng mga Taga-Batangas at ng mga Taga-Laguna: Isang Paghahambing

    Directory of Open Access Journals (Sweden)

    Jaderick P. Pabico

    2013-12-01

    Full Text Available Online social networking (OSN has become of great influence to Filipinos, where Facebook, Twitter, LinkedIn, Google+, and Instagram are among the popular ones. Their popularity, coupled with their intuitive and interactive use, allow one's personal information such as gender, age, address, relationship status, and list of friends to become publicly available. The accessibility of information from these sites allow, with the aid of computers, for the study of a wide population's characteristics even in a provincial scale. Aside from being neighbouring locales, the respective residents of Laguna and Batangas both derive their livelihoods from two lakes, Laguna de Bay and Taal Lake. Both residents experience similar problems, such as that, among many others, of fish kill. The goal of this research is to find out similarities in their respective online populations, particularly that of Facebook's. With the use of computational dynamic social network analysis (CDSNA, we found out that the two communities are similar, among others, as follows: both populations are dominated by single young female; Homophily was observed when choosing a friend in terms of age (i.e., friendships were created more often between people whose ages do not differ by at most five years; and Heterophily was observed when choosing friends in terms of gender (i.e., more friendships were created between a male and a female than between both people of the same gender. This paper also presents the differences in the structure of the two social networks, such as degrees of separation and preferential attachment.

  9. Congener-specific polychlorinated biphenyl patterns in eggs of aquatic birds from the lower Laguna Madre, Texas

    Science.gov (United States)

    Mora, Miguel A.

    1996-01-01

    Eggs from four aquatic bird species nesting in the Lower Laguna Madre, Texas, were collected to determine differences and similarities in the accumulation of congener-specific polychlorinated biphenyls (PCBs) and to evaluate PCB impacts on reproduction. Because of the different toxicities of PCB congeners, it is important to know which congeners contribute most to total PCBs. The predominant PCB congeners were 153, 138, 180, 110, 118, 187, and 92. Collectively, congeners 153, 138, and 180 accounted for 26 to 42% of total PCBs. Congener 153 was the most abundant in Caspian terns (Sterna caspia) and great blue herons (Ardea herodias) and congener 138 was the most abundant in snowy egrets (Egretta thula) and tricolored herons (Egretta tricolor). Principal component analysis indicated a predominance of higher chlorinated biphenyls in Caspian terns and great blue herons and lower chlorinated biphenyls in tricolored herons. Snowy egrets had a predominance of pentachlorobiphenyls. These results suggest that there are differences in PCB congener patterns in closely related species and that these differences are more likely associated with the species' diet rather than metabolism. Total PCBs were significantly greater (p Laguna Madre were below concentrations known to affect bird reproduction.

  10. Congener-specific polychlorinated biphenyl patterns in eggs of aquatic birds from the Lower Laguna Madre, Texas

    Energy Technology Data Exchange (ETDEWEB)

    Mora, M.A. [Texas A and M Univ., College Station, TX (United States)

    1996-06-01

    Eggs from four aquatic bird species nesting in the Lower Laguna Madre, Texas, were collected to determine differences and similarities in the accumulation of congener-specific polychlorinated biphenyls (PCBs) and to evaluate PCB impacts on reproduction. Because of the different toxicities of PCB congeners, it is important to know which congeners contribute most to total PCBs. The predominant PCB congeners were 153, 138, 180, 110, 118, 187, and 92. Collectively, congeners 153, 138, and 180 accounted for 26 to 42% of total PCBs. Congener 153 was the most abundant in Caspian terns (Sterna caspia) and great blue herons (Ardea herodias) and congener 138 was the most abundant in snowy egrets (Egretta thula) and tricolored herons (Egretta tricolor). Principal component analysis indicated a predominance of higher chlorinated biphenyls in Caspian terns and great blue herons and lower chlorinated biphenyls in tricolored herons. Snowy egrets had a predominance of pentachlorobiphenyls. These results suggest that there are differences in PCB congener patterns in closely related species and that these differences are more likely associated with the species` diet rather than metabolism. Total PCBs were significantly greater (p < 0.05) in Caspian terns than in the other species. Overall, PCBs in eggs of birds from the Lower Laguna Madre were below concentrations known to affect bird reproduction.

  11. Distribution and community structure of ichthyoplankton in Laguna Madre seagrass meadows: Potential impact of seagrass species change

    Science.gov (United States)

    Tolan, J.M.; Holt, S.A.; Onuf, C.P.

    1997-01-01

    Seasonal ichthyoplankton surveys were made in the lower Laguna Madre, Texas, to compare the relative utilization of various nursery habitats (shoal grass, Halodule wrightii; manatee grass, Syringodium filiforme;, and unvegetated sand bottom) for both estuarine and offshore-spawned larvae. The species composition and abundance of fish larvae were determined for each habitat type at six locations in the bay. Pushnet ichthyoplankton sampling resulted in 296 total collections, yielding 107,463 fishes representing 55 species in 24 families. A broad spectrum of both the biotic and physical habitat parameters were examined to link the dispersion and distribution of both pre-settlement and post-settlement larvae to the utilization of shallow seagrass habitats. Sample sites were grouped by cluster analysis (Ward's minimum variance method) according to the similarity of their fish assemblages and subsequently examined with a multiple discriminant function analysis to identify important environmental variables. Abiotic environmental factors were most influential in defining groups for samples dominated by early larvae, whereas measures of seagrass complexity defined groups dominated by older larvae and juveniles. Juvenile-stage individuals showed clear habitat preference, with the more shallow Halodule wrightii being the habitat of choice, whereas early larvae of most species were widely distributed over all habitats. As a result of the recent shift of dominance from Halodule wrightii to Syringodium filiforme, overall reductions in the quality of nursery habitat for fishes in the lower Laguna Madre are projected.

  12. Estimated natural streamflow in the Rio San Jose upstream from the pueblos of Acoma and Laguna, New Mexico

    Science.gov (United States)

    Risser, D.W.

    1982-01-01

    The development of surface and ground water, which began about 1870 in the upper Rio San Jose drainage basin, has decreased the flow of the Rio San Jose on the Pueblo of Acoma and the Pueblo of Laguna. The purpose of this study was to estimate the natural streamflow in the Rio San Jose that would have entered the pueblos if no upstream water development had taken place. Estimates of natural flow were based upon streamflow and precipitation records, historical accounts of streamflow, records of irrigated acreage, and empirically-derived estimates of the effects on streamflow of Bluewater Lake, groundwater withdrawals, and irrigation diversions. Natural streamflow in the Rio San Jose at the western boundary of the Pueblo of Acoma is estimated to be between 13,000 and 15,000 acre-feet per year, based on 55 years of recorded and reconstructed streamflow data from water years 1913 to 1972. Natural streamflow at the western boundary of the Pueblo of Laguna is estimated to be between 17 ,000 and 19,000 acre-feet per year for the same period. The error in these estimates of natural streamflow is difficult to assess accurately, but it probably is less than 25 percent. (USGS)

  13. Radiological protection in nuclear power plants; La proteccion radiologica en las centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Zorrilla R, S. [CFE. Central Laguna Verde, Km. 42.5 Carretera Cardel-Nautla, Veracruz (Mexico)

    2008-12-15

    This presentation sharing experiences which correspond to the nuclear power plant of Laguna Verde. This nuclear power plant is located at level 2 of four possible, in the classification performance of the World Association of Nuclear Operators (WANO), which means the mexican nuclear power plant is classified in terms of its performance indicators and above the average achieved by their counterparts americans and canadians. In the national context, the nuclear power plant of Laguna Verde has also been honored with several awards such as the National Quality Award, the Clean Industry Certificate, the distinction of Environmental Excellence and others of similar importance. For the standards of WANO, the basic idea is that there are shortcomings in one of nuclear power plant concern to all partners. The indicators used for the classification will always go beyond more compliance with regulations, which are assumed, and rather assume come or a path to excellence. Among the most important indicators are: the collective dose, the percentage of areas declared as contaminated, the number, type and tendency of contamination personal cases, the number of dosimetry alarms, the number of unplanned exposures, loss control of high radiation areas and the release of contaminated material outside the restricted areas. Furthermore, as already indicated, nuclear power plants are of special care situations, such as, carrying out work in areas with radiation fields of more than 15 mSv h{sup -1}, the movement of spent fuel in the reload floor. The consideration of the minimum total effective dose equivalent as a criterion for prescribing tools that reduce exposures, but may increase the external cases of contaminated casualties, the experience in portals such as workers subject to radiology, where exposure in industrial radiography, and so on. Special mention deserve the conditions generated during fuel reload stops, which causes a massive personnel movement, working simultaneously on

  14. Popular conceptions of schizophrenia in Cape Verde, Africa Concepções populares da esquizofrenia em Cabo Verde, África

    Directory of Open Access Journals (Sweden)

    Mário Dinis Mateus

    2005-06-01

    Full Text Available INTRODUCTION: It has been well documented that schizophrenia presents a better clinical course in developing countries. Although there are many epidemiological studies showing this association, little research has been conducted to investigate the local representation systems for schizophrenia in these countries. OBJECTIVES: This study focuses on cultural factors of schizophrenia, namely the local representation systems for the disease, as well as what is locally understood as deviant behavior and its acceptability, and mechanisms of social-cultural insertion or exclusion of patients with schizophrenia in Cape Verde, Africa. METHODS: Randomized open interviews were carried out with the relatives of patients under treatment at the mental health out patient service of the Batista de Sousa Hospital (São Vicente Island between the years 1994 and 1995. Interviews dealt with patients' life histories and disease related to problems, strategies employed by the family to cope with such problems, and comments on the social and family burden. RESULTS: 20 interviews with close relatives of 10 patients were analyzed. The study focused on three main categories explaining schizophrenia: "tired head" (cabeça cansada, "nervous" (nervoso, and supernatural categories (like "sorcery" or "witchcraft". The interviewees expressed their opinions, either explicitly or not, on whether their relatives truly had a disease. CONCLUSION: Characteristics of local categories for schizophrenia found in Cape Verde can be regarded as a less stigmatized way of dealing with the disease. It is reasonable to suppose that the understanding of such cultural factors could lead to better outcomes in the treatment for schizophrenia in this country, and also in others, where similar conditions can be identified.INTRODUÇÃO: Tem sido bem documentado que a esquizofrenia apresenta um melhor curso clínico em países em desenvolvimento. Ainda que haja muitos estudos epidemiol

  15. Selected Hydrologic, Water-Quality, Biological, and Sedimentation Characteristics of Laguna Grande, Fajardo, Puerto Rico, March 2007-February 2009

    Science.gov (United States)

    Soler-López, Luis R.; Santos, Carlos R.

    2010-01-01

    Laguna Grande is a 50-hectare lagoon in the municipio of Fajardo, located in the northeasternmost part of Puerto Rico. Hydrologic, water-quality, and biological data were collected in the lagoon between March 2007 and February 2009 to establish baseline conditions and determine the health of Laguna Grande on the basis of preestablished standards. In addition, a core of bottom material was obtained at one site within the lagoon to establish sediment depositional rates. Water-quality properties measured onsite (temperature, pH, dissolved oxygen, specific conductance, and water transparency) varied temporally rather than areally. All physical properties were in compliance with current regulatory standards established for Puerto Rico. Nutrient concentrations were very low and in compliance with current regulatory standards (less than 5.0 and 1.0 milligrams per liter for total nitrogen and total phosphorus, respectively). The average total nitrogen concentration was 0.28 milligram per liter, and the average total phosphorus concentration was 0.02 milligram per liter. Chlorophyll a was the predominant form of photosynthetic pigment in the water. The average chlorophyll-a concentration was 6.2 micrograms per liter. Bottom sediment accumulation rates were determined in sediment cores by modeling the downcore activities of lead-210 and cesium-137. Results indicated a sediment depositional rate of about 0.44 centimeter per year. At this rate of sediment accretion, the lagoon may become a marshland in about 700 to 900 years. About 86 percent of the community primary productivity in Laguna Grande was generated by periphyton, primarily algal mats and seagrasses, and the remaining 14 percent was generated by phytoplankton in the water column. Based on the diel studies the total average net community productivity equaled 5.7 grams of oxygen per cubic meter per day (2.1 grams of carbon per cubic meter per day). Most of this productivity was ascribed to periphyton and macrophytes

  16. Diseño de Lagunas de Estabilización en Serie con Diferentes configuraciones. (Caso Comarca Lagunera Estado de Durango, México.

    Directory of Open Access Journals (Sweden)

    Facundo Cortés Martínez

    2011-01-01

    Full Text Available Una de las principales desventajas en un sistema de tratamiento de lagunas de estabilización es el requerimiento del terreno, es por ello que en el diseño se deben analizar varias propuestas. El objetivo del presente estudio fue realizar un análisis comparativo de resultados en el diseño de una planta de tratamiento a base de lagunas. Lo indicado incluyendo dos arreglos en serie, el primero: anaerobia, facultativa y maduración. En el segundo caso, facultativa y maduración. Se diseñó una planta de tratamiento para una comunidad rural localizada en el municipio de Gómez Palacio, Dgo. Los resultados del primer arreglo muestran un área menor del 17.11 % y un tiempo de retención de 21.68 días. Los dos esquemas analizados cumplen satisfactoriamente con los límites máximos permisibles de concentración de contaminantes que indica la normatividad. El primer arreglo de lagunas de estabilización es el que se recomienda de acuerdo con las condiciones climáticas locales. Es prudente proponer otros arreglos de lagunas, luego comparar los resultados considerando la disponibilidad del terreno, recursos económicos y las normas de calidad aplicables.

  17. Instrumentos de molienda: evidencias del procesamiento de recursos vegetales en la laguna de Castillos (Rocha, Uruguay

    Directory of Open Access Journals (Sweden)

    Irina Capdepont

    2005-12-01

    Full Text Available Se presentan los resultados obtenidos del estudio de instrumentos de molienda recuperados en la Excavación I del montículo A del sitio Guardia del Monte -laguna de Castillos- Uruguay. Para realizar el trabajo se procedió a la caracterización de los instrumentos de molienda mediante el relevamiento de los atributos físicos y de las características funcionales. Para esto último se aplicó la Técnica de Extracción e Identificación de Partículas Biosilíceas, con el objetivo de realizar correlaciones entre instrumentos particulares y tipos de recursos vegetales específicos. Asimismo, se emplearon fuentes escritas profundizando en los aspectos relacionados con la molienda y uso de recursos vegetales. Los resultados obtenidos permitieron identificar el procesamiento de vegetales con aplicaciones alimenticias (preparación de harinas, bebidas fermentadas, etc. y tecnológicas (textilería, cordelería, cestería, entre los que se identificaron recursos silvestres y cultivados o manejados. Algunos instrumentos presentaron evidencias de procesamiento de recursos alimenticios, otros de recursos tecnológicos y finalmente otros con indicios de multifuncionalidad. Asimismo, se constató una cierta correlación entre algunos de los atributos físicos de los instrumentos y la funcionalidad atribuida a partir de los vegetales identificados y los usos referidos en las fuentes etnográficas.This paper presents the results from studies performed on milling stone tools recovered at Excavation I, Mound A from Guardia del Monte Site, Castillos lagoon, Uruguay. Physical attributes and functional features were used for the characterization of grinding artefacts. To this end opal phytoliths were extracted and analyzed in order to correlate different kinds of artefacts with specific vegetable resources. Written sources were used additionally to reach a deeper understanding of other aspects related to grinding activities and use of vegetable resources. The

  18. Delivery of Services of Day Care Workers In Sta. Maria, Laguna

    Directory of Open Access Journals (Sweden)

    ROLANDO R. CRUZADA, JR.

    2014-02-01

    Full Text Available This study focused on the determination of the delivery of services of day care workers in the municipality of Sta. Maria, Province of Laguna during the first semester of school year 2012-2013. Descriptive research was used in this study. Among the key findings were that Day Care Workers with respect to interactional relationship accomplished the functions with outstanding adequacy such as constantly giving feedback and praises on the performance of children, along with workers and parents coordination and cooperation, with verbal interpretation of Always Observe. In terms of instructional quality both group of respondents perceived that day care workers in-charge had adequate abilities and competencies concerning their education and trainings in connection with teaching small children with verbal interpretation of Always Observe. The parents had confidence to the day care workers in-charge of their children aside from regularly consulting the day care workers about their children’s progress with verbal interpretation of Always Observe. There were only 871 households who availed of the services of day care centers in which 27 workers were employed and each of them assigned to handle an average of 33 children. Notable along with other findings was the day care workers and parents had the same perception as to the extent of services provided by the Day Care Center with respect to interactional relationship, instructional quality and parental participation. Subsequently the study ensued with these five factual remarks: Children’s interactions with parents in the centers were the direct mechanisms through which children learn. The educational qualification and the capability of the day care workers to handle small children were the primary essentials in children’s learning. Parents’ participation in the day care centers premises brought harmonious relationship between the Day Care Workers and children as well. The capacity of day care worker

  19. El viaje espiritual al 'espacio verde': el 'jardín de la visión' en el sufismo

    OpenAIRE

    Gonzalo Carbó, Antoni

    2007-01-01

    El viaje espiritual al «espacio verde» es un recorrido por el significado simbólico del color verde, el color litúrgico y espiritual del Islam, tomando como punto de partida la obra de dos artistas iraníes contemporáneos: Suhrab Sepehri y Shirin Neshat. Desde las antiguas religiones del Oriente Próximo hasta el Islam, el verde es el color del firmamento espiritual, el de los vergeles del Paraíso, la tierra del más allá. El jardín verdeante que alcanza el alma difunta (den) en el mazdeísmo, el...

  20. O jornal A Escola e a construção da escola moderna e republicana (Laguna, década de 1910 - The newspaper A Escola and the construction of modern and republican school (Laguna, decade of 1910

    Directory of Open Access Journals (Sweden)

    Gladys Mary Ghizoni Teive

    2013-04-01

    Full Text Available O presente estudo analisa dois exemplares do jornal A Escola, veiculado no Grupo Escolar Jerônimo Coelho, de Laguna, Sul de Santa Catarina, em 1916. O que este jornalzinho teria a ver com aqueles que anos mais tarde foram popularizados por Decroly e Freinet e incorporados às escolas primárias brasileiras como parte das associações auxiliares da escola? Esta questão constituiu-se no fio condutor desta reflexão histórica, buscando indícios que contribuam para a discussão acerca do ensino ativo, carro-chefe da pedagogia moderna, e da escola ativa, principal bandeira da escola nova. Para tanto, analisa principais temas pautados pela gazeta A Escola quais sejam: o patriotismo republicano e a civilidade burguesa.Palavras-chave: jornal escolar, pedagogia moderna, grupo escolar. THE NEWSPAPER A ESCOLA AND THE CONSTRUCTION OF MODERN AND REPUBLICAN SCHOOL (LAGUNA, DECADE OF 1910AbstractThis study examines two copies of the newspaper The School, published by the School Group Jerônimo Coelho, Laguna, south of Santa Catarina in 1916. What would this newspaper have to do with those that years later were popularized by Decroly and Freinet and incorporated to Brazilian primary schools as part of the auxiliary school associations? This question was the thread of this historical reflection, seeking clues that would contribute to the discussion of active teaching, flagship of Modern Pedagogy, and active school, main feature of progressive education. Therefore, it analyzes the main themes debated by the newspaper The School such as: republican patriotism and bourgeois civility.Key-words: school newspaper, modern pedagogy, school group. EL PERIÓDICO A ESCOLA Y LA CONSTRUCCIÓN DE LA ESCUELA MODERNA Y REPUBLICANA (LAGUNA, DÉCADA DE 1910ResumenEl presente estudio analiza dos ejemplares del Periódico La Escuela, vehiculado en el Grupo Escolar Jerônimo Coelho, de Laguna, sur de Santa Catarina, en 1916. ¿Este periodiquito qué tendría que ver con

  1. Estudo do feijão verde (Vigna unguiculata (L Walp minimamente processado

    Directory of Open Access Journals (Sweden)

    FURTUNATO Andréa A

    2000-01-01

    Full Text Available Visando definir tecnologias alternativas de processamento do feijão verde (Vigna unguiculata (L Walp, estudou-se o processo de congelamento do mesmo. Este consistiu na recepção da matéria prima, seleção dos grãos de coloração e tamanho uniformes, seguida de lavagem em água corrente e branqueamento por imersão em água a 90ºC. Os grãos foram acondicionados em sacos plásticos e congelados em freezer doméstico a -18ºC, sendo armazenados a essa temperatura. Foi realizado o estudo de vida de prateleira desse produto por 180 dias, através de análises físico-químicas, microbiológicas e sensoriais, preservando-se em boas condições para o consumo. Foi realizado também o teste de aceitação do produto comparando-se com o feijão verde fresco. Embora o nível de aceitação não tenha sido muito alto (71,1% quando comparado com o feijão fresco (96,6%, este resultado poderia ser diferente em regiões que não têm o hábito de consumir esta leguminosa no estádio de maturação verde fresco.

  2. Fibra da casca do coco verde como substrato agrícola

    Directory of Open Access Journals (Sweden)

    Carrijo Osmar Alves

    2002-01-01

    Full Text Available A produção comercial de mudas e o cultivo sem solo de hortaliças estão se tornando práticas comuns entre os olericultores. Vários materiais orgânicos como as turfas, resíduos de madeira, casca de pinus e de arroz parcialmente carbonizada ou não, ou materiais inorgânicos como areia, rochas vulcânicas, perlita, lã de rocha e a espuma fenólica já são utilizados como substratos, isoladamente ou em composição. A casca de coco verde que em muitas regiões causa transtorno ao serviço de limpeza pública pelo volume e pela dificuldade de decomposição produz uma fibra que pode ser utilizada como substrato. Para a produção da fibra, a casca de coco verde é picada, desfibrada, triturada, lavada e secada. Para o uso como substrato na produção de mudas, a fibra deve passar por um processo de compostagem. Este processo não é necessário para o uso como substrato em cultivo sem solo, mas no entanto, o substrato necessitará ser enriquecido com nutrientes em pré-plantio ou em fertirrigação. O uso do substrato da fibra de coco verde na produção de tomate em casa de vegetação, alcançou, em termos absolutos, 13,2 kg m-2 de frutos comerciais (média de 3 anos cerca de 7,3% mais que o segundo melhor substrato, o pó de serra com 12,3 kg m-2.

  3. Legitimacy and Innovation in Mining: the case of the Oro Verde Program

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    Mariana Sarmiento

    2013-11-01

    Full Text Available The paper describes how the Oro Verde Program emerged, and how it has gained recognition as an innovative program that has successfully promoted improved social and environmental practices for small scale miners. The paper describes the local and regional context where the miners from Oro Verde are from, and attempts to explain how it waspossible for two afro-colombian communities, two NGOs and a government agency to find alternative arrangements to overcome the challenges that result from the complexities of the Choco region in Colombia. The paper argues that one factor of success is the interaction among participants to create a Non-State Market Driven Governance System. In the case of the Oro Verde Program, the norms created by the international system surrounding sustainable development were necessary for allowing the NGOs to bring financial resources into the project as well as opening the doors to isolated communities in Choco to an international market that valued sustainably produced products. Similarly, the national policies surrounding Green Markets and the existence of a government research institution, made the certification process possible and legitimate. Finally, having a law that recognized land rights to afro-Colombian communities and the community councils as local authorities, as well as customary laws about natural resource use and access within these territories was key for the viability of the project. All of these organizations, working as a nested governance system, that respected and embraced different but interdependent norms and interests, were key for the consolidation of a NSMD that has resonated throughout the world and that has become an element of some afro-Colombians’ struggle to protect their rights for self-determination.

  4. Preferência do pulgão-preto e da cigarrinha-verde em diferentes genótipos de feijão-caupi em Roraima = Preference of the black aphid and green leafhopper in different genotypes of cowpea in Roraima, Brazil

    Directory of Open Access Journals (Sweden)

    Hugo Falkyner da Silva Bandeira

    2015-03-01

    Gurgueia, BRS Guariba, BRS Cauamé, Pretinho Precoce 1, UFRR Grão Verde, Apiaú, Iracema, Cara-Preta, and Sempre Verde. The experimental design was carried out in randomized blocks with four replications. Each variety was planted in four parallel lines, considering the two central rows as the useful area. Counting of aphids-black was taken directly across the last fully open leaf, whereas the leafhoppers leaf stage was performed by the method of beating plants on tray with water. The genotypes BRS Cauamé, BRS Guariba, and Pretinho Precoce 1 had the lowest levels of infestation by A. craccivora, presenting, therefore, a nonpreference resistance compared to the others assessed. The genotype Apiaú was susceptible to Empoasca sp. and the genotypes BR-17 Gurgueia, Cara-Preta, Sempre Verde, UFRR Grão Verde, and BRS Cauamé were the most resistant, since they were least preferred by leafhoppers at 28 and 35 days after plant emergence.

  5. Consideraciones sobre la contratación pública sostenible ("verde")

    OpenAIRE

    Pierre Foy Valencia

    2011-01-01

    Sobre la base de un enfoque de desarrollo sostenible y sistema jurídico (derecho ambiental) se inserta el rol del Derecho Administrativo y cómo a modo de ejemplo se traduce en algunas instituciones legales, aterrizando en la moderna visón de la contratación y compras sostenible o verdes. Se abordan experiencias comparadas, así como la presencia de la ética y la política de tales contrataciones, los desafíos y beneficios tanto para el propio Estado en su rol de consumidor, como para la socieda...

  6. Produção e estado nutricional do milho em cultivo intercalar com adubos verdes

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    R. Heinrichs

    2002-03-01

    Full Text Available A utilização da adubação verde para estabelecer a diversidade e o equilíbrio do sistema de produção é um dos paradigmas da agricultura moderna. Com o objetivo de avaliar a produção e o estado nutricional da cultura de milho sob cultivo intercalar com adubos verdes, foi realizado, entre 1995 e 1997, um experimento em campo, em Piracicaba (SP, em um Litossolo Vermelho eutrófico. O milho foi semeado no espaçamento de 0,90m nas entrelinhas, perfazendo aproximadamente 50.000plantas por hectare. Os tratamentos constaram de uma testemunha, sem cultivo intercalar, e quatro espécies de adubos verdes: mucuna anã (Mucuna deeringiana (Bort. Merr, guandu anão (Cajanus cajan (L. Millsp, crotalária (Crotalaria spectabilis Roth e feijão-de-porco (Canavalia ensiformis (L. DC., semeados sem adubação, no meio da entrelinha, distante 45cm da linha do milho, em duas épocas: simultânea à semeadura do milho e 30dias após. O solo, no primeiro ano, foi preparado sob sistema convencional e, no segundo, cultivaram-se as culturas sob semeadura direta. O delineamento experimental foi de blocos ao acaso com parcelas subdivididas e quatro repetições. O estado nutricional e a produção de grãos do milho apresentaram melhores resultados no cultivo consorciado com feijão-de-porco. Os efeitos positivos desta espécie na produtividade de grãos de milho foram mais acentuados no segundo ano de adoção do cultivo consorciado, quando o sistema de manejo do solo foi semeadura direta. A semeadura dos adubos verdes simultânea ao milho foi o manejo mais recomendável, por não prejudicar o desenvolvimento do milho e reduzir a operação pós-plantio.

  7. Online environments in the professionalization of secondary education teachers in Cape Verde: an action research project

    OpenAIRE

    Mendonça, Adriana

    2014-01-01

    Tese de doutoramento em Ciências da Educação (área de especialização em Tecnologia Educativa). A introdução de ambientes online nas práticas docentes no ensino superior, tem-se afigurado numa necessidade um pouco por todo o mundo. Nesta investigação apresenta-se uma dessas iniciativas desenvolvidas na universidade de Cabo Verde (Uni-CV), no Departamento de Ciências Sociais e Humanas (DCSH). A Uni-CV conta com oito anos de existência, encontrando-se ainda na caminhada para a inc...

  8. Aprofitant cada engruna de calor : el Tub Verd de Mataró

    OpenAIRE

    Alerm, Llorenç

    2012-01-01

    La calor residual de diverses infraestructures mediambientals permet distribuir calor i fred al seu entorn urbà. Es tracta d’un aprofitament energètic que redueix contaminació, emissions de CO2 i importacions de combustible. Una estratègia que fa anys que funciona a diversos països del món: al centre i nord d’Europa fa temps que hi està força estesa, i més recentment ha arribat aquí, amb iniciatives com la del Tub Verd de Mataró.

  9. Composition and origin of PM10 in Cape Verde: Characterization of long-range transport episodes

    Science.gov (United States)

    Salvador, P.; Almeida, S. M.; Cardoso, J.; Almeida-Silva, M.; Nunes, T.; Cerqueira, M.; Alves, C.; Reis, M. A.; Chaves, P. C.; Artíñano, B.; Pio, C.

    2016-02-01

    A receptor modelling study was performed to identify source categories and their contributions to the PM10 total mass at the Cape Verde archipelago. Trajectory statistical methods were also used to characterize the main atmospheric circulation patterns causing the transport of air masses and to geographically identify the main potential source areas of each PM10 source category. Our findings point out that the variability of the PM10 levels at Cape Verde was prompted by the advections of African mineral dust. The mineral dust load was mainly composed by clay-silicates mineral derived elements (22% of the PM10 total mass on average) with lower amounts of carbonates (9%). A clear northward gradient was observed in carbonates concentration that illustrates the differences in the composition according to the source regions of mineral dust. Mineral dust was frequently linked to industrial emissions from crude oil refineries, fertilizer industries as well as oil and coal power plants, located in the northern and north-western coast of the African continent (29%). Sea salt was also registered in the PM10 mass during most part of the sampling period, with a lower impact in the PM10 levels than the mineral dust one (26%). Combustion aerosols (6%) reached the highest mean values in summer as a consequence of the emissions from local-regional sources. Biomass burning aerosols produced from October to November in sub-sahelian latitudes, had a clear influence in the content of elemental carbon (EC) recorded at Cape Verde but a small impact in the PM10 total mass levels. A minor contribution to the PM10 mass has been associated to secondary inorganic compounds-SIC. Namely, ammonium sulfate and nitrate (SIC 1-5%) and calcium sulfate and nitrate (SIC 2-3%). The main origin of SIC 1 was attributed to emissions of SO2 and NOx from industrial sources located in the northern and north-western African coast and from wildfires produced in the continent. SIC 2 had a clear regional origin

  10. Techos verdes y el confort térmico en Angostillo, Veracruz, México.

    OpenAIRE

    Beltrán Melgarejo, Abraham

    2013-01-01

    Se diseñó un prototipo de techo verde con enredaderas tropicales y se evaluó el confort térmico brindado por éste en viviendas de una zona rural tropical. Con base en entrevistas a viveristas de la región centro de Veracruz y un recorrido de campo, se preseleccionaron cinco especies Mandevilla sanderi, Solandra maxima, Passiflora edulis, Thunbergia alata y Cissus verticillata. Se evaluó la adaptabilidad de éstas al ambiente sobre techos modelo en condiciones de campo, midiendo sus tasas de cr...

  11. INDICADORES BIOFÍSICOS DE DESERTIFICAÇÃO, CABO VERDE/ÁFRICA

    OpenAIRE

    Vládia Pinto Vidal de Oliveira

    2011-01-01

    El trabajo discute el diagnostico geoambiental de la Isla de Santiago de Cabo Verde. Tiene como objetivo evaluar la dinámica ambiental y el estado de evolución de los sistemas naturales, estableciendo las categorías de los medios ecodinámicos. Cada categoría del medio está asociada al comportamiento y a la vulnerabilidad de las condiciones geoambientales en función de los procesos de degradación. Sobre el punto de vista teórico- -metodológico, se adoptaron criterios integrativos capaces de at...

  12. Aula Verde: art as experience in community-based environmental education.

    Science.gov (United States)

    Abarca, Marco A

    2010-01-01

    After winning a class-action lawsuit against unconstitutional prison conditions in Puerto Rico, Marco Abarca managed to direct part of the fine monies accumulated throughout years of litigation toward an investment that would improve the living conditions in one of the largest and poorest housing projects in Puerto Rico. With the participation of parolees and probationers, he began to transform a mosquito-infested badland into a natural haven. Then, with the help of science educators, the group designed a workshop for elementary school children on urban ecology. As the participants organized, what developed was a community-based, self-employed enterprise known as Aula Verde.

  13. Caracterização da farinha de banana verde Green banana flour characterization

    OpenAIRE

    Antonia de Maria Borges; Joelma Pereira; Eliseu Marlônio Pereira de Lucena

    2009-01-01

    O presente trabalho objetivou a obtenção, a caracterização físico-química e o controle microbiológico durante o processamento da farinha de banana (Musa spp.) verde, cv. Prata, visando o seu aproveitamento na panificação, produtos dietéticos e alimentos infantis. Para obtenção da farinha, os frutos foram cortados, imersos em metabissulfito de sódio, desidratados e triturados, sendo em seguida, feitas as seguintes determinações: umidade; extrato etéreo; proteína bruta; fibra bruta; cinzas; fra...

  14. O verde que não era esperança

    OpenAIRE

    2012-01-01

    O arsenito de cobre, obtido originalmente há quase 240 anos, e popularizado sob o nome de “verde de Scheele”, ainda hoje é um tema que suscita interrogações quanto ao curso das aplicações que a sociedade emergente da revolução industrial lhe reservou, as quais estiveram na origem de um fenómeno de intoxicação com arsénio à escala global. O design e a moda deram-lhe grande uso; as contas bancárias de uns poucos beneficiaram muito. E os outros?

  15. Análisis preliminares de los materiales líticos provenientes de la Laguna Blanca Chica (Olavarría, Buenos Aires

    Directory of Open Access Journals (Sweden)

    Pablo G. Messineo

    2004-12-01

    Full Text Available En este trabajo se presentan los resultados preliminares sobre el estudio de los materiales líticos recuperado en la Laguna Blanca Chica (Partido de Olavarría, Provincia de Buenos Aires. El objetivo principal es conocer las estrategias relacionadas al aprovisionamiento y explotación de las materias primas presentes, como los procesos tecnológicos utilizados sobre las mismas. Los resultados obtenidos indican que la ftanita (55,58% y la cuarcita (43,23% fueron las materias primas más utilizadas. Los instrumentos (formales e informales presentan mayores frecuencias de ftanita. Los altos porcentajes de esta materia prima en la laguna se asemejan a otros sitios del área (e.g., Laguna La Barrancosa 2, Arroyo Tapalqué 1, lo cual puede deberse a su alta disponibilidad y excelente calidad para la talla. Por otro lado, se observa una gran variabilidad entre las rocas cuarcíticas, proponiéndose la explotación de distintas formaciones geológicas.In this paper we report some preliminary results of the study of lithic material recovered from Laguna Blanca Chica, Olavarría district, Buenos Aires Province. The main aim of the study is to gain knowledge of aspects related to the acquisition of, and technological process involved in, raw material exploitation. The results obtained show that more than 50% of the principal lithic resource used consisted of chert. Formal and informal artefacts were also made using mainly chert as the raw material. The high frequency of this raw material in the lagoon is similar to other sites in the area (e.g., Laguna La Barrancosa 2, Arroyo Tapalqué 1, and may be due to its high natural availability and good chipping quality. Even so, a great variability of quartzite rocks was observed, showing that different geological formations were exploited.

  16. TIJOLOS DE TERRA CRUA ESTABILIZADOS COM FIBRAS DE COCO VERDE: ALTERNATIVA PARA HABITAÇÃO DE INTERESSE SOCIAL

    OpenAIRE

    Soares, Raquel Nascimento; Silva, Adeildo Cabral; Pinheiro, Jose Cesar

    2008-01-01

    Este trabalho propõe a utilização da fibra de coco verde incorporada à terra crua como material alternativo na construção de tijolos de adobe. As fibras foram cedidas a partir de uma parceria com a EMBRAPA, onde é produzido em sua Unidade de Beneficiamento da Casca do Coco Verde cerca de 530 t/a de fibra bruta. A fibra inserida ao adobe tem características de agir como um esqueleto principal devido à presença de celulose, lignina e hemicelulose atuarem conferindo uma maior coesão entre os com...

  17. Entre la publicidad social y la publicidad ambiental: una revisión de la contrapublicidad verde de Greenpeace

    OpenAIRE

    Martín Villar, Sara

    2015-01-01

    Este trabajo presenta un análisis y evolución de la publicidad social, sus efectos, características y tendencias en nuestra sociedad. Se conceptualiza la publicidad verde como medio de denuncia de lo social, y se realiza una recopilación de las acciones de Greenpeace y su contrapublicidad para detener la deforestación de los bosques de Indonesia. Una aproximación a los conceptos de publicidad social, publicidad ambiental, publicidad verde y contrapublicidad.

  18. Tratamento do líquido gerado no beneficiamento da casca de coco verde em sistema de lodos ativados

    OpenAIRE

    2007-01-01

    O principal impacto ambiental do processo de beneficiamento da casca de coco verde é a geração de resíduo líquido com elevada carga orgânica. Este trabalho teve como objetivo aplicar o sistema convencional de lodos ativados para o tratamento biológico do líquido gerado no beneficiamento da casca de coco verde, além de utilizar o teste de taxa de consumo de oxigênio (TCO) para avaliar a toxicidade do efluente ao lodo aeróbio. O reator de escala laboratorial foi inoculado com lodo proveniente d...

  19. Desarrollo de alimentos tipo snack de bajo contenido graso a partir de discos de manzana verde

    OpenAIRE

    Tavera Quiroz, María José

    2015-01-01

    Esta investigación se basó en el desarrollo de productos tipo snack bajos en grasa a partir de manzana verde Granny Smith (Malus domestica). Se desarrollaron snacks a partir de manzanas verdes estudiando diferentes alternativas de cocción (fritado, horneado o su combinación) con el objetivo de obtener productos con menor contenido graso que los tradicionales pero con las propiedades que los consumidores valoran en los mismos, como el color y la textura crocante. Para ello se analizó...

  20. A High-Resolution Reconstruction of Late Holocene Environmental Change from Laguna Ek'Naab, Northern Holmul Region, Peten, Guatemala

    Science.gov (United States)

    Anderson, L.; Wahl, D.; Estrada-Belli, F.

    2015-12-01

    Widespread demographic shifts in the southern Maya lowlands at the end of the Classic period have been attributed to environmental change caused by human activity and/or climate variability. Fire was essential to landscape modification and was a primary agent of environmental change associated with prehispanic land use. While several studies have provided insight into the dynamic relationship between natural and anthropogenic drivers of change, defining the specific interplay between natural environmental change, human modification of the environment, and cultural response to changes remains a persistent challenge. Here we present the results of a multi-proxy study that reconstructs fire history, agricultural land use, and environmental change during and after Pre-Columbian Maya settlement. Results are interpreted in the context of settlement history as inferred from archaeological mapping around the study site. Our findings suggest landscape disturbance, as indicated by erosion, local burning, and nearby maize agriculture, was at its peak during the Early Classic period. This disturbance was likely due to large-scale settlement at the nearby site of Witzna'. All proxies indicate a slow decline in disturbance into the Late Classic period, beginning around 1300 cal yr BP. Cival and Chanchich, two proximal site centers to the south of Laguna Ek'Naab, supported their largest populations during the Late Preclassic and Late Classic, with little or no settlement during the Early Classic. The data from Laguna Ek'Naab suggests that Witzna' may have been an important center during the Early Classic. Whether the decreasing environmental degradation after 1240 cal yr BP is do to a decline in local population or changing land use strategies is not discernable based on the data thus far. However, the near complete absence of burning and continued decrease in erosion from 1240-1090 cal yr BP suggests little anthropogenic activity in the area. Burning resumes in the watershed

  1. Influência de áreas verdes urbanas sobre a mirmecofauna

    Directory of Open Access Journals (Sweden)

    Milene Andrade Estrada

    Full Text Available O trabalho objetivou estudar a influência de características da arborização das áreas verdes urbanas sobre a mirmecofauna. A pesquisa foi conduzida no Município de Três Rios-RJ, em um parque urbano e em cinco praças públicas arborizadas. Foram obtidas a densidade de árvores, a densidade de espécies de árvores e a temperatura do ar. As formigas foram coletadas no solo e sobre o tronco de árvores, com iscas de sardinha. Foram coletadas 44 espécies de formigas, 26 espécies no solo e 37 espécies nas árvores. A densidade de espécies de árvores influenciou positivamente o número total de espécies de formigas e a diversidade de espécies coletadas nas árvores. Conclui-se que o aumento da densidade de espécies de árvores nas áreas verdes urbanas pode colaborar para a conservação da diversidade biológica.

  2. Parque Verde do Mondego: gestão e uso público

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    Yuli Della Volpi

    2016-05-01

    Full Text Available O presente artigo se refere a um estudo de caso que teve como recorte espacial o Parque Verde do Mondego, localizado às margens do Rio Mondego, na cidade de Coimbra, em Portugal. A pesquisa teve como objetivo compreender a gestão da área e o uso público do espaço. Para tanto, realizou-se, inicialmente, uma pesquisa bibliográfica e documental; em seguida, foram feitas diversas visitas ao parque e, por fim, uma entrevista com o responsável pela administração do local. Pôde-se, por meio do estudo, compreender o processo de criação do Parque Verde do Mondego, sua concessão para as empresas privadas, realizada por meio de concursos públicos, e seu uso pela população da cidade de Coimbra. Foram verificados ainda a carência de atividades de animação sociocultural na área – embora exista na cidade de Coimbra um curso de graduação em Animação Socioeducativa –, os conflitos existentes entre setor público e privado, além de determinados problemas que atingem atualmente o parque, como as inundações causadas pelas cheias do Rio Mondego.

  3. Áreas verdes públicas urbanas: conceitos, usos e funções

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    Carlos Roberto Loboda

    2005-06-01

    Full Text Available O presente trabalho consiste em uma reflexão sobre os espaços públicos vegetados na organização dos aglomerados urbanos. Serão abordados aspectos históricos dos espaços livres de construção já nas primeiras cidades, como conseqüência das necessidades experimentadas a cada momento na relação cidade e natureza. Utiliza-se como fundamentação teórica os aspectos conceituais que definem e caracterizam as principais funções das áreas verdes urbanas. As diferentes concepções construídas ao longo dos períodos históricos remontam um perfil desses espaços, representados hoje pelos parques, praças, jardins públicos e arborização de acompanhamento viário. Torna-se necessário fazer um resgate das áreas verdes públicas e suas funções indispensáveis na estruturação da cidade moderna.

  4. Numerical modelling of Alto Verde landslide using the material point method

    Directory of Open Access Journals (Sweden)

    Marcelo Alejandro Llano-Serna

    2015-01-01

    Full Text Available Finalizando el año 2008 en la ciudad de Medellín, Colombia, ocurrió un deslizamiento de tierra en la urbanización Alto Verde provocando la muerte de doce personas y la destrucción de seis viviendas. Los deslizamientos se destacan por el elevado nivel de deformaciones en una masa de suelo. El presente trabajo utilizó el método del punto material (MPM, método basado en partículas que utiliza una doble discretización Lagrangiano-Euleriana. La doble discretización genera un marco numérico robusto que permite la simulación de grandes distorsiones. El modelo numérico planteó una simplificación de las condiciones geotécnicas, morfológicas y estructurales de las edificaciones envueltas en Alto Verde. El estado de deformación final de la simulación se acomodó satisfactoriamente a las características geométricas finales observadas en campo. Los resultados obtenidos generan aplicaciones como el diseño de barreras, análisis de riesgo o la determinación de la distancia mínima de retiro a una ladera susceptible de deslizamiento.

  5. Oxygen, hydrogen, and helium isotopes for investigating groundwater systems of the Cape Verde Islands, West Africa

    Science.gov (United States)

    Heilweil, V.M.; Solomon, K.D.; Gingerich, S.B.; Verstraeten, Ingrid M.

    2009-01-01

    Stable isotopes (??18O, ??2H), tritium (3H), and helium isotopes (3He, 4He) were used for evaluating groundwater recharge sources, flow paths, and residence times of three watersheds in the Cape Verde Islands (West Africa). Stable isotopes indicate the predominance of high-elevation precipitation that undergoes little evaporation prior to groundwater recharge. In contrast to other active oceanic hotspots, environmental tracers show that deep geothermal circulation does not strongly affect groundwater. Low tritium concentrations at seven groundwater sites indicate groundwater residence times of more than 50 years. Higher tritium values at other sites suggest some recent recharge. High 4He and 3He/4He ratios precluded 3H/3He dating at six sites. These high 3He/4He ratios (R/Ra values of up to 8.3) are consistent with reported mantle derived helium of oceanic island basalts in Cape Verde and provided end-member constraints for improved dating at seven other locations. Tritium and 3H/3He dating shows that S??o Nicolau Island's Ribeira Faj?? Basin has groundwater residence times of more than 50 years, whereas Fogo Island's Mosteiros Basin and Santo Ant??o Island's Ribeira Paul Basin contain a mixture of young and old groundwater. Young ages at selected sites within these two basins indicate local recharge and potential groundwater susceptibility to surface contamination and/or salt-water intrusion. ?? Springer-Verlag 2009.

  6. Diversidad florística asociada a las lagunas andinas Pomacocha y Habascocha, Junín, Perú

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    Mercedes Flores

    2013-05-01

    Full Text Available Se realizó un estudio de la diversidad florística de los alrededores de las lagunas Pomacocha y Habascocha (4350 - 4550 m de altitud, 11°45’-11°48’S y 75°12’-75°15’O, Provincia de Concepción, Junín, Perú. Se han registrado 29 familias, 64 géneros y 100 especies. Poaceae fue la familia con mayor diversidad específica (25%, seguida por Asteraceae (24% y Gentianaceae (6%. Se hace una comparación de la composición florística de la puna de Concepción con la de otras localidades de la puna del Perú.

  7. La denuncia a través de la mujer: La casa de la laguna, de Rosario Ferré

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    Ana Molestina

    2015-08-01

    Full Text Available La historia puertorriqueña es una historia de imposiciones identitarias, choques culturales y ambivalencia desde la llegada de los españoles a la isla. En La casa de la laguna, Ferré analiza el pasado  y el presente de Puerto Rico. Crea una reconstrucción simbolizada en la historia de las familias Mendizábal-Monfort, en la cual Isabel Monfort, trata de descubrir las causas del fracaso de su matrimonio. En esta búsqueda y reflexión personal, se representan las versiones olvidadas o silenciadas de la historia puertorriqueña y de igual manera, da voz y vida a las mujeres marginadas o silenciadas.

  8. Las dependencias regionales de los asentamientos humanos localizados en el parque nacional “Lagunas de Chacahua”, Oaxaca

    Directory of Open Access Journals (Sweden)

    Marco Antonio Huerta García

    2000-01-01

    Full Text Available Este trabajo tiene como objetivo revelar la dinámica regional de los asentamientos humanos localizados en el parque nacional Lagunas de Chacahua". derivada de actividades de prioritaria necesidad poblacional. En una primera parte se presentan las principales posturas teórico-metodológicas asumidas en la investigación. En la segunda, se identifica una jerarquía de cuatro asentarnientos humanos de interés, presentes en el territorio, que permite apreciar la importancia relativa de éstos dentro del parque nacional. El contenido final se desarrolla sobre la base de la correlación espacial entre la jerarquía revelada y las dependencias regionales de funciones esenciales de los residentes locales, como la asistencia médica, el abasto alimentario y la comercialización de la producción pesquera.

  9. Tectonic forcing of shelf-ramp depositional architecture, Laguna Madre-Tuxpan Shelf, western Gulf of Mexico

    Science.gov (United States)

    Wawrzyniec, Tim F.; Ambrose, W.; Aranda-Garcia, M.; Romano, U. H.

    2004-07-01

    Analysis of seismic reflection data reveals the existence of a major listric fault that accommodates most of the Neogene extension of the Laguna Madre-Tuxpan shelf of the western Gulf of Mexico. The variation of related growth strata, the profile of the modern shelf-slope transition, the linear gradient of shelf extension (as well as basin accommodation) along the trace of the fault support a hypothesis that sediment loading along the northern part of the fault drives fault motion and influences sediment distribution along the southern end of the fault. In particular, where kinematic accommodation appears to outpace sediment supply, sedimentation is maximized along a shelf-ramp system and not the shelf-slope transition.

  10. Characterizing the eolian sediment component in the lacustrine record of Laguna Potrok Aike (southeastern Patagonia)

    Science.gov (United States)

    Ohlendorf, C.; Gebhardt, C.

    2013-12-01

    Southern South America with its extended dry areas was one of the major sources for dust in the higher latitudes of the southern hemisphere during the last Glacial, as was deduced from fingerprinting of dust particles found in Antarctic ice cores. The amount of dust that was mobilized is mostly related to strength and latitudinal position of the Southern Hemisphere Westerly Winds (SWW). How exactly SWW shifted between glacial and interglacial times and what consequences such shifts had for ocean and atmospheric circulation changes during the last deglaciation is currently under debate. Laguna Potrok Aike (PTA) as a lake situated in the middle of the source area of dust offers the opportunity to arrive at a better understanding of past SWW changes and their associated consequences for dust transport. For this task, a sediment record of the past ~51 ka is available from a deep drilling campaign (PASADO). From this 106 m long profile, 76 samples representing the different lithologies of the sediment sequence were selected to characterize an eolian sediment component. Prior to sampling of the respective core intervals, magnetic susceptibility was measured and the element composition was determined by XRF-scanning on fresh, undisturbed sediment. After sampling and freeze drying, physical, chemical and mineralogical sediment properties were determined before and after separation of each sample into six grainsize classes for each fraction separately. SEM techniques were used to verify the eolian origin of grains. The aim of this approach is to isolate an exploitable fingerprint of the eolian sediment component in terms of their grain size, physical properties, geochemistry and mineralogy. Thereby, the challenging aspect is that such a fingerprint should be based on high-resolution down-core scanning techniques, so time-consuming techniques such as grain-size measurements by laser detection can be avoided. A first evaluation of the dataset indicates that magnetic

  11. High-Resolution Paleosalinity Reconstruction From Laguna de la Leche, North Coastal Cuba, Using Sr, O, and C Isotopes

    Science.gov (United States)

    Peros, M. C.; Reinhardt, E. G.; Schwarcz, H. P.; Davis, A. M.

    2008-12-01

    Isotopes of Sr, O, and C were studied from a 227-cm long sediment core to develop a high-resolution paleosalinity record to investigate the paleohydrology of Laguna de la Leche, north coastal Cuba, during the Middle to Late Holocene. Palynological, plant macrofossil, foraminiferal, ostracode, gastropod, and charophyte data from predominantly euryhaline taxa, coupled with a radiocarbon-based chronology, indicate that the wetland evolved through four phases: (1) an oligohaline lake existed from 6200 to 4800 cal yr B.P.; (2) water level in the lake increased and the system freshened from 4800 to 4200 cal yr B.P.; (3) a mesohaline lagoon replaced the lake 4200 cal yr B.P.; and (4) mangroves enclosed the lagoon beginning 1700 cal yr B.P., forming a mesohaline lake. Isotopic ratios were measured on specimens of the euryhaline foraminifer Ammonia beccarii, although several measurements were also made on other calcareous microfossils in order to identify potential taphonomic and/or vital effects. The 87Sr/86Sr results show that the average salinity of Laguna de la Leche was 1.7 ppt during the early lake phase and 8 ppt during the lagoon phase - a change driven by relative sea level rise. The delta18O results do not record the salinity increase seen in the 87Sr/86Sr data, but instead indicate high evaporation from the lake surface. Variability in delta13C was controlled by plant productivity, episodic marine incursions, and vegetation community change. There is some evidence for seasonal effect and the lateral transport of microfossils prior to burial. Our results show that Sr isotopes, while often cited as a powerful paleosalinity tool, should be used in conjunction with other indicators when investigating paleosalinity trends; relying solely on any single isotopic or ecological indicator can lead to inaccurate results, especially in semi-enclosed and closed hydrological systems.

  12. Biología del pejerrey Odontesthes bonariensis (Pisces, Atherinopsidae de la laguna Los Charos (Córdoba, Argentina

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    Miguel Mancini

    2008-12-01

    Full Text Available El pejerrey Odontesthes bonariensis es la especie más importante de las pesquerías del centro de Argentina. Se estudio la captura por unidad de esfuerzo (CPUE, la condición corporal, el crecimiento y la alimentación de O. bonariensis de la laguna pampeana Los Charos (34º28´S, 64º23´W, 240 ha, ubicada en la provincia de Córdoba. Se realizaron cuatro muestreos estacionales en el periodo 2002-2003. Para la captura de peces se utilizaron redes de arrastre y enmalle. Se capturaron 2862 ejemplares de un rango de talla comprendido entre 38 y 380 mm de longitud estándar (LSt. La CPUE promedio fue de 74,3(±71,0kg/20 hs de tendido de red. La relación LSt-peso presentó diferencias significativas entre épocas del año (P< 0,01. Los índices de condición corporal estuvieron dentro de los límites de referencia de la especie. El crecimiento calculado fue: LSt(t=459,8*[1–exp(-0,3105*(t-0,175]. La relación LSt–Longitud total (LT fue: LT(mm=8,23+LSt*1,14 (n=283; R2=0,99. El zooplancton constituyó un ítem alimenticio secundario en los peces jóvenes. En los ejemplares de 3+ años de vida se observó un marcado canibalismo, situación que explicaría en parte su mejor condición corporal. La laguna Los Charos presenta una elevada producción de O. bonariensis.

  13. Sr Isotopes and Migration of Prairie Mammoths (Mammuthus columbi) from Laguna de las Cruces, San Luis Potosi, Mexico

    Science.gov (United States)

    Solis-Pichardo, G.; Perez-Crespo, V.; Schaaf, P. E.; Arroyo-Cabrales, J.

    2011-12-01

    Asserting mobility of ancient humans is a major issue for anthropologists. For more than 25 years, Sr isotopes have been used as a resourceful tracer tool in this context. A comparison of the 87Sr/86Sr ratios found in tooth enamel and in bone is performed to determine if the human skeletal remains belonged to a local or a migrant. Sr in bone approximately reflects the isotopic composition of the geological region where the person lived before death; whereas the Sr isotopic system in tooth enamel is thought to remain as a closed system and thus conserves the isotope ratio acquired during childhood. Sr isotope ratios are obtained through the geologic substrate and its overlying soil, from where an individual got hold of food and water; these ratios are in turn incorporated into the dentition and skeleton during tissue formation. In previous studies from Teotihuacan, Mexico we have shown that a three-step leaching procedure on tooth enamel samples is important to assure that only the biogenic Sr isotope contribution is analyzed. The same Sr isotopic tools can function concerning ancient animal migration patterns. To determine or to discard the mobility of prairie mammoths (Mammuthus columbi) found at Laguna de las Cruces, San Luis Potosi, México the leaching procedure was applied on six molar samples from several fossil remains. The initial hypothesis was to use 87Sr/86Sr values to verify if the mammoth population was a mixture of individuals from various herds and further by comparing their Sr isotopic composition with that of plants and soils, to confirm their geographic origin. The dissimilar Sr results point to two distinct mammoth groups. The mammoth population from Laguna de Cruces was then not a family unit because it was composed by individuals originated from different localities. Only one individual was identified as local. Others could have walked as much as 100 km to find food and water sources.

  14. Determinaciones de Parámetros de Diseño para Lagunas de Alta Velocidad con Residuales Pesqueros.

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    Teresita de Jesús Romero López

    2005-01-01

    Full Text Available Debido a la necesidad de conservar el medio ambiente circundante y muy especialmente las aguas interiores y costeras, se estudian diferentes sistemas de tratamiento de las aguas de desecho para su aplicación en instalaciones que carezcan de ellas. En el caso muy especial de la industria pesquera, donde solamente 14 establecimientos poseen tratamiento de los 42 activos hasta la fecha, se requiere del estudio y rápida puesta en marcha de alternativas que logren disminuir la carga contaminante hasta valores permisibles. Por tales motivos, además del estudio que se realizó a diferentes escalados para explorar y proponer un sistema de tratamiento por laguna de alta velocidad con microalgas del género Chlorella, se calcularon ecuaciones tanto empíricas como cinéticas a partir de los valores de Demanda Bioquímica de Oxígeno (DBO, con el objetivo de facilitar la predicción de la eficiencia del sistema en sí, así como su diseño. Para el cálculo de las ecuaciones empíricas se tuvieron en consideración las cargas orgánicas superficiales aplicadas y removidas (COa y COr y las cargas orgánicas volumétricas aplicadas y removidas (COva y COvr. Por otra parte, se comprobó que la ecuación de primer orden para un sistema en batch se ajusta al proceso depurador que ocurre en los mismos, siendo el valor promedio obtenido para la constante cinética del proceso 0,47 d¿1. Los resultados logrados en este estudio demuestran las grandes posibilidades que tienen las lagunas de alta velocidad para el tratamiento de las aguas residuales de la industria pesquera cubana, además de aportar una herramienta de gran valor para su diseño.

  15. Recovery of floral and faunal communities after placement of dredged material on seagrasses in Laguna Madre, Texas

    Science.gov (United States)

    Sheridan, P.

    2004-03-01

    The objectives of this project were to determine how long alterations in habitat characteristics and use by fishery and forage organisms were detectable at dredged material placement sites in Laguna Madre, Texas. Water, sediment, seagrass, benthos, and nekton characteristics were measured and compared among newly deposited sediments and nearby and distant seagrasses each fall and spring over three years. Over this period, 75% of the estimated total surface area of the original deposits was either re-vegetated by seagrass or dispersed by winds and currents. Differences in water and sediment characteristics among habitat types were mostly detected early in the study. There were signs of steady seagrass re-colonization in the latter half of the study period, and mean seagrass coverage of deposits had reached 48% approximately three years after dredging. Clovergrass Halophila engelmannii was the initial colonist, but shoalgrass Halodule wrightii predominated after about one year. Densities of annelids and non-decapod crustaceans were generally significantly greater in close and distant seagrass habitats than in dredged material habitat, whereas densities of molluscs were not significantly related to habitat type. Nekton (fish and decapod) densities were almost always significantly greater in the two seagrass habitats than in dredged material deposits. Benthos and nekton communities in dredged material deposits were distinct from those in seagrass habitats. Recovery from dredged material placement was nearly complete for water column and sediment components after 1.5 to 3 years, but recovery of seagrasses, benthos, and nekton was predicted to take 4 to 8 years. The current 2 to 5 years dredging cycle virtually insures no time for ecosystem recovery before being disturbed again. The only way to ensure permanent protection of the high primary and secondary productivity of seagrass beds in Laguna Madre from acute and chronic effects of maintenance dredging, while ensuring

  16. [Clinical and immunological assessment of Polyoxidonium and Tantum Verde efficiency by catarrhal gingivitis treatment in children with chronic gastroduodenitis].

    Science.gov (United States)

    Kazarina, L N; Pursanova, A E

    2014-01-01

    The article presents findings allowing estimating effect of local application of polioxidonium and yantum verde in 101 children aged 12-17 with chronic catarrhal gingivitis and chronic gastroduodenitis. Statistically significant PMA indeх decrease (40.1±2.3% till 1.4±0.6% (рgingivitis in children with chronic gastroduodenitis.

  17. Implementación del proceso de canal verde en la aduana marítima de Guayaquil

    OpenAIRE

    2008-01-01

    propone un nuevo proceso para facilitar el comercio exterior y de manera en especial las actividades de importación; este proceso denominado Canal Verde o Aforo Automático está siendo aplicando en la mayoría de las aduanas del mundo logrando crear aduanas eficientes

  18. Migração na África Ocidental e Cabo Verde: uma relação recente?

    Directory of Open Access Journals (Sweden)

    Eufémia Vicente Rocha

    2013-01-01

    Full Text Available The aim of this paper is to reconstruct, from a eurocentric perspective, how migration is objectivated, today, in Cape Verde, the circumstances in which immigration is thought and the conditions to understand it out of the patterns that shape it into a Western form, static. Here, witchcraft appears as an obstacle to this relation of domination.

  19. The Surface Rupture of the 2010 El Mayor-Cucapah Earthquake and its Interaction with the 1892 Laguna Salada Rupture - Complex Fault Interaction in an Oblique Rift System (Invited)

    Science.gov (United States)

    Rockwell, T. K.; Fletcher, J. M.; Teran, O.; Mueller, K. J.

    2010-12-01

    The 2010 El Mayor-Cucapah earthquake (Mw 7.2) demonstrates intimate mechanical interactions between two major fault systems that intersect within and along the western margin of the Sierra Cucapah in Baja California, Mexico. Rupture associated with 2010 earthquake produced ~4 m of dextral oblique slip and propagated through an imbricate stack of east-dipping faults. Toward the north, rupture consistently steps left to structurally deeper faults located farther west and in this manner passes through the core of the Sierra Cucapah to its western margin. The western margin of the Sierra Cucapah is defined by the Laguna Salada fault (LSF), which forms part of an active west-directed oblique detachment system recognized as the source of the large (M7+) February 22, 1892 earthquake. In the central Sierra Cucapah, the fault systems are separated by a narrow horst block, and here the 2010 event produced triggered slip on the LSF. These surface breaks follow the exact trace of the 1892 rupture, but their sense of slip (10-30 cm of pure normal displacement) differs radically from the 5 m of oblique dextral-normal slip produced by the 1892 event. Farther north, the narrow horst block is buried beneath strata of the northern Laguna Salada rift basin, and at this location, west-directed scarps of the LSF accommodate a significant component of dextral slip associated with the primary 2010 surface rupture. Thus, the two fault systems combine to accommodate oblique extension in the northern part of the range and likely have linking structures at fairly shallow depth. Newly identified paleo-scarps extend the known 1892 rupture length from 20 km to as much as 42 km, from the Canon Rojo fault to the Yuha Basin; consistent with a Mw 7.2 event and historical reports of MMI VII damage in San Diego. Both fault systems generate large earthquakes (>M7.2), with the west-directed LSF fault accommodating rapid subsidence in the adjacent basin during M7+ events at ~ 2Ka recurrence. Initial

  20. Filogenética Molecular de Peces del Complejo Midas Cichlidae que habitan lagos y lagunas de Nicaragua, utilizando el gen COI

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    Lucía Páiz-Medina

    2012-12-01

    Full Text Available Las lagunas cratéricas de Nicaragua se consideran verdaderos "laboratorios" naturales de investigación debido a que son geológicamente jóvenes y por su pequeña dimensión, lo que permite el estudio de procesos evolutivos y de especiación. En estas lagunas se encuentran especies endémicas (familia Cichlidae que representan recursos valiosos para estudios de especiación, incluyendo la velocidad y fuerzas con las que el aislamiento geográfico, la selección natural y sexual provocan la diversificación fenotípica y, finalmente, la especiación misma. Los peces de la familia Cichlidae han sido objeto de mucha controversia debido a que morfológicamente es difícil diferenciarlos y se requieren de nuevas herramientas moleculares para descifrar las diferencias a nivel genético y entender mejor los procesos de especiación de este fascinante grupo de peces. En este estudio se utilizó el gen Citocromo Oxidasa I, COI, para determinar las relaciones filogenéticas entre los peces del Complejo presente en lagos y lagunas de Nicaragua. El COI ha sido propuesto como "código de barras" genético y como técnica ha sido estandarizada para animales. Este trabajo es parte de una investigación más grande que se enmarca en el Proyecto "DNA Barcoding de la biodiversidad nicaragüense" y se realiza en el Centro de Biología Molecular de la Universidad Centroamericana. Con este estudio se ha logrado determinar que: (1 el gen COI discrimina entre especies de diferentes lagunas, (2 las relaciones entre las especies Midas Cichlidae son complejas y es necesario más de un gen para obtener resultados concluyentes, (3 las especies fundadoras de las lagunas cratéricas provienen del lago de Nicaragua, (4 en las lagunas habitan más de una especie del Complejo Midas Cichlidae y (5 se infiere que la especiación simpátrica es el mecanismo evolutivo que ha conducido a la creación de estas especies, confirmando la hipótesis de otros autores y aportando nuevos

  1. DIAGNÓSTICO DAS ÁREAS VERDES PÚBLICAS DO BAIRRO POTENGI, NATAL/RN

    Directory of Open Access Journals (Sweden)

    Liana de Holanda Viana Barros

    2015-10-01

    Full Text Available Este estudo teve por objetivo diagnosticar as principais áreas verdes do bairro Potengi, localizado na Região Administrativa Norte de Natal-RN. A metodologia adotada consistiu, principalmente, de levantamentos bibliográfico e documental e, posteriormente, de pesquisa de campo, por meio da qual foi possível se visitar ruas, praças, canteiros e passeios públicos do bairro. A detecção das áreas verdes se deu inicialmente com o uso do google Earth. Os resultados apontaram que as áreas verdes do bairro Potengi estão em torno de 2,20 km² de extensão, correspondendo a uma taxa de 27,54% do território da região. As principais praças e canteiros visitados dispõem de árvores de pequeno a médio portes. Conclui-se que as áreas verdes públicas do bairro Potengi estão concentradas basicamente nas praças e canteiros centrais das principais ruas e avenidas. O percentual de arborização do bairro apresenta-se pouco significativo, requerendo com isso um maior envolvimento das populações locais e do poder público no sentido de se ampliar a arborização dos passeios públicos, visto que a presença de áreas verdes no espaço urbano é fator de extrema relevância para o bem-estar da população. Além disso, devido a importância das áreas verdes para a melhoria da qualidade de vida, o estudo constatou, ainda, a falta de investimento público no que tange a manutenção e revitalização das áreas verdes públicas.

  2. Intensidade de poda verde em pessegueiro para controle da ferrugem Tranzschelia discolor (Fuckel Tranzschel e Litvinov Rust Tranzschelia discolor (Fuckel Tranzschel and Litvinov control by green pruning in peach

    Directory of Open Access Journals (Sweden)

    Alessandro Rodrigues

    2008-09-01

    Full Text Available Com o objetivo de se avaliar o controle da ferrugem [Tranzschelia discolor (Fuckel Tranzschel e Litvinov] em pessegueiro 'Flordaprince' [Prunus persica (L. Batsch], duas intensidades de poda verde foram realizadas aos 45 dias após a colheita: poda leve e poda de renovação. O experimento foi realizado em condições de campo, no Departamento de Produção Vegetal da ESALQ-USP, em Piracicaba-SP, entre novembro de 2004 e janeiro de 2005. O delineamento experimental adotado foi inteiramente ao acaso, com dois tratamentos e doze réplicas. A parcela experimental correspondeu a duas plantas em espaçamento 3,0 x 1,2 m e conduzidas sob sistema de líder central. A avaliação de incidência e severidade de ferrugem foi realizada em folhas de quatro brotações por parcela, sendo duas por planta. As avaliações foram conduzidas de 33 a 81 dias após a poda verde, em intervalos de sete dias, utilizando-se de escala diagramática adaptada para a ferrugem. Os dados referentes à incidência e severidade de ferrugem foram submetidos, respectivamente, ao teste exato de Fisher e ao teste de Wilcoxon. A incidência e a severidade de ferrugem aumentaram com a idade das folhas, independentemente do tipo de poda verde empregada, atingindo, respectivamente, 81,95% das folhas e 1,43% de área foliar lesionada, aos 81 dias após a poda verde. A poda de renovação não reduziu os níveis de ferrugem em pessegueiro 'Flordaprince' em relação à poda leve, a partir dos 40 dias após a poda verde.Rust [Tranzschelia discolor (Fuckel Tranzschel and Litvinov] control in peach [Prunus persica (L. Batsch] cultivar 'Flordaprince' was evaluated through the use of two green pruning levels performed 45 days after harvest: light pruning and renovation pruning. Experimental works were conducted at University of São Paulo, Piracicaba-SP, Brazil, from November 2004 to January 2005. Experimental design was completely randomized with two treatments and 12 replicates

  3. Evaluación del proceso y la eficiencia de remoción de la materia orgánica en las lagunas de estabilización del municipio de La Ceja, Antioquia, Colombia

    Directory of Open Access Journals (Sweden)

    MEJÍA RUIZ ROBERTO

    2010-05-01

    Full Text Available En esta investigación, se estudió la condición ambiental y el funcionamiento de las lagunas de estabilización para el tratamiento de las aguas residuales del municipio de La Ceja, Antioquia. Este sistema ha presentado deficiencias en su operación, reflejadas en problemas organolépticos, hidráulicos y metabólicos. El sistema de lagunas del municipio de La Ceja está conformado por dos lagunas anaerobias y una laguna facultativa, que reciben las aguas residuales domésticas provenientes de un alcantarillado combinado. En los años 2003 y 2004, se realizaron mediciones de variables físicas, químicas y biológicas, incluyendo tres muestreos generales. El sistema funcionó deficientemente debido a problemas hidráulicos. La deficiencia del sistema estuvo acompañada de una baja remoción de nutrientes disueltos en la laguna facultativa asociada a un pobre desarrollo de la comunidad de microorganismos. El sistema presentó una remoción de carga orgánica del 75 %, relacionada principalmente con la sedimentación en las lagunas anaerobias.

  4. Pre-Hispanic agricultural decline prior to the Spanish Conquest in southern Central America

    Science.gov (United States)

    Taylor, Zachary P.; Horn, Sally P.; Finkelstein, David B.

    2013-08-01

    Archeological and paleoenvironmental records from southern Central America attribute population collapse to the Spanish Conquest about 500 years ago. Paleoclimate records from the circum-Caribbean have shown evidence of severe, regional droughts that contributed to the collapse of the Mayan Civilization, but there are few records of these droughts in southern Central America and no records of their effects on prehistoric populations in the region. Here we present a high-resolution lake sediment record of prehistoric agricultural activities using bulk sediment stable carbon isotopes from Laguna Zoncho, Costa Rica. We find isotopic evidence that agriculture was nearly absent from the watershed approximately 220 years prior to the Spanish arrival in Costa Rica and identify two distinct periods of agricultural decline, 1150-970 and 860-640 cal yr BP, which correspond to severe droughts in central Mexico. We attribute decreases in agriculture to a weakened Central American monsoon, which would have shortened the growing season at Laguna Zoncho, reduced crop yields, and negatively affected prehistoric populations.

  5. Resiliencia ambiental: el uso de la infraestructura verde en la cuenca de Itacorubi, municipio de Florianópolis, Brasil

    Directory of Open Access Journals (Sweden)

    Bárbara Heliodora Alves D´Acampora

    2015-12-01

    Full Text Available Resumen El presente artículo tiene como objetivo presentar una metodología para la implementación de la infraestructura verde de escala regional y urbana para la resiliencia ambiental de la cuenca de Itacorubi, que está sufriendo graves impactos ambientales. Serán investigados los conceptos sobre la infraestructura verde y resiliencia ambiental, y la caracterización ambiental de la cuenca. A partir del análisis de DAFO será posible hacer un diagnóstico territorial para medir, según los aspectos de debilidades, amenazas, fortalezas y oportunidades, el grado de sostenibilidad del paisaje y del manglar de la cuenca. Será verificado que la implementación de una infraestructura verde, a través de conexiones verdes multifuncionales, en la escala regional y urbana, es una solución viable y de gran rendimiento para tornar la cuenca de Itacorubi resiliente. Palabras clave Infraestructura verde, resiliencia ambiental, impactos ambientales, análisis de DAFO, manglar Abstract This article aims to present a methodology for the implementation of green infrastructure for regional and urban environmental resilience for the basin of Itacorubi; which is suffering serious environmental damages. It will be investigated concepts of green infrastructure and environmental resilience, and environmental characterization of the basin. From the SWOT analysis will be possible to make a territorial diagnosis to measure; according to aspects of weaknesses, threats, strengths, and opportunities; the sustainability of the landscape and mangrove basin. It will be verified that the implementation of green infrastructure; through multifunctional green connections in the regional and urban scale; is a viable and has good performance to turn the basin Itacorubi resilient. Keywords Green infrastructure, environmental resilience, environmental impacts, SWOT analysis, mangrove

  6. Lazer, esporte e turismo: importância e uso das áreas verdes urbanas em Belém/Brasil

    OpenAIRE

    Figueiredo, Silvio Lima; Bahia, Mirleide Chaar; Cabral, Patrícia Thatyane Miranda; Nóbrega, Wilker Ricardo de Medonça; Tavares, Auda Edileusa Piani

    2013-01-01

    O artigo apresenta as análises da pesquisa realizada em parques e áreas verdes urbanos de uma cidade da Amazônia Brasileira, Belém. A pesquisa teve como objetivo explicitar as representações sobre as áreas verdes da cidade pelos seus usuários, em práticas de esporte e lazer, realizadas por residentes e turistas. Foram entrevistados usuários das áreas verdes, em entrevistas diretivas, porém abertas, e também observações em campo. Foram debatidos os conceitos de esporte-lazer, de...

  7. Cohesive Sediment Erodibility and Evolution of a Mud Deposit on the Palos Verdes Shelf

    Science.gov (United States)

    Sherwood, C. R.; Ferre, B.; Murray, C. J.; Sanford, L. P.; Warner, J. C.; Wiberg, P. L.

    2006-12-01

    We have added a cohesive-sediment erodibility algorithm to ROMS, a three-dimensional numerical model for circulation and sediment transport. The new code implements an algorithm developed by Sanford ("Modeling a dynamically varying mixed sediment bed with erosion, deposition, bioturbation, consolidation, and armoring", Computers and Geosciences, in review.) The algorithm assumes that cohesive sediment has a critical stress for erosion that varies (typically increasing) with depth in the sediment, determined by various physical and biological properties or processes. Erosion and deposition alter this profile, but it is reestablished over a characteristic time scale which is longer than typical resuspension events (a few days) but probably less than a year. The critical stress profile limits the amount of sediment that can be eroded during to the mass available at the maximum stress applied during the event. Because the critical stress profile varies with time, the response to events depends on the history of sediment disturbance and recovery. The shapes of the critical stress profiles can vary both horizontally and vertically. In this pilot application, the shapes of the profiles were determined from geostatistical modeling of field data collected on a mud deposit on the Palos Verdes Shelf off Los Angeles. The data include about 30 traditional grain-size measurements, 10 erosion-chamber experiments, and 160 measurements of the penetration depths of a sediment-profiling camera. The penetration depths were highly correlated (r=0.84) with the slope of the erodibility profiles determined by the erosion chamber. Maps of erodibility (i.e., slope and offset of the critical stress profiles) on the Palos Verdes Shelf were made with Gaussian simulation and collocated cokriging of the erosion-chamber data conditioned on the camera-penetration data. These and maps of bottom grain-size distribution were used to initialize the bed sediment in ROMS. Model runs were made for the

  8. Surficial Geologic Map of Mesa Verde National Park, Montezuma County, Colorado

    Science.gov (United States)

    Carrara, Paul E.

    2012-01-01

    Mesa Verde National Park in southwestern Colorado was established in 1906 to preserve and protect the artifacts and dwelling sites, including the famous cliff dwellings, of the Ancestral Puebloan people who lived in the area from about A.D. 550 to A.D. 1300. In 1978, the United Nations designated the park as a World Heritage Site. The geology of the park played a key role in the lives of these ancient people. For example, the numerous (approximately 600) cliff dwellings are closely associated with the Cliff House Sandstone of Late Cretaceous age, which weathers to form deep alcoves. In addition, the ancient people farmed the thick, red loess (wind-blown dust) deposits on the mesa tops, which because of its particle size distribution has good moisture retention properties. The soil in this loess cover and the seasonal rains allowed these people to grow their crops (corn, beans, and squash) on the broad mesa tops. Today, geology is still an important concern in the Mesa Verde area because the landscape is susceptible to various forms of mass movement (landslides, debris flows, rockfalls), swelling soils, and flash floods that affect the park's archeological sites and its infrastructure (roads, septic systems, utilities, and building sites). The map, which encompasses an area of about 100 mi2 (260 km2), includes all of Mesa Verde National Park, a small part of the Ute Mountain Indian Reservation that borders the park on its southern and western sides, and some Bureau of Land Management and privately owned land to the north and east. Surficial deposits depicted on the map include: artificial fills, alluvium of small ephemeral streams, alluvium deposited by the Mancos River, residual gravel on high mesas, a combination of alluvial and colluvial deposits, fan deposits, colluvial deposits derived from the Menefee Formation, colluvial deposits derived from the Mancos Shale, rockfall deposits, debris flow deposits, earthflow deposits, translational and rotational landslide

  9. MCTP, a code for the thermo-mechanical analysis of a fuel rod of BWR type reactors (Neutron part); MCTP, un codigo para el analisis termo-mecanico de una barra combustible de reactores tipo BWR (Parte Neutronica)

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez L, H.; Ortiz V, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: hhl@nuclear.inin.mx

    2003-07-01

    In the National Institute of Nuclear Research of Mexico a code for the thermo-mechanical analysis of the fuel rods of the BWR type reactors of the Nucleo electric Central of Laguna Verde is developed. The code solves the diffusion equation in cylindrical coordinates with several energy groups. The code, likewise, calculates the temperature distribution and power distribution in those fuel rods. The code is denominated Multi groups With Temperatures and Power (MCTP). In the code, the energy with which the fission neutrons are emitted it is divided in six groups. They are also considered the produced perturbations by the changes in the temperatures of the materials that constitute the fuel rods, the content of fission products, the uranium consumption and in its case the gadolinium, as well as the plutonium production. In this work there are present preliminary results obtained with the code, using data of operation of the Nucleo electric Central of Laguna Verde. (Author)

  10. Determinación de Glifosato mediante inmunoensayo enzimático (ELISA en el Paisaje Protegido Laguna de Rocha y su entorno, Uruguay.

    Directory of Open Access Journals (Sweden)

    Daniela Nardo

    2015-12-01

    Full Text Available En el entorno de la Laguna de Rocha se ha visto incrementada la superficie dedicada a las actividades agrícolas con un mayor uso de plaguicidas, entre ellos el herbicida glifosato, usado en cultivos de soja principalmente. Mediante la utilización de técnicas de inmunoensayo enzimático (ELISA, se investigó la presencia de glifosato en la Laguna y algunos de sus afluentes en dos momentos específicos de tiempo. Se detectó glifosato en 27 de las 28 muestras estudiadas. Muestras positivas por ELISA fueron confirmadas por cromatografía iónica. El método ELISA demostró ser una herramienta de screening adecuada para determinar la presencia de glifosato en agua.

  11. Astronomical Alignments of the Sun Temple site in Mesa Verde National Park

    CERN Document Server

    Towers, Sherry

    2016-01-01

    Summer 2015 marked the 100th anniversary of the excavation by J.W. Fewkes of the Sun Temple in Mesa Verde National Park, Colorado; an ancient ceremonial complex of unknown purpose, prominently located atop a mesa, constructed by the Pueblo Indians approximately 1000 years ago. In this analysis we perform a digital survey of the site, and examine the possibility that four key tower-like elements of the complex were used for observation of the rise or set of celestial bodies known to be sacred to the Pueblo Indians. We find statistically significant evidence that the site was used for astronomical observation of the rise and/or set of nearly all such bodies. The Sun Temple appears to represent the most comprehensive prehistoric astronomical observatory yet uncovered.

  12. Competitividade de destinos turísticos: o caso das ilhas de Cabo Verde

    Directory of Open Access Journals (Sweden)

    Milene Monteiro

    2015-01-01

    Full Text Available The main goal of this research focuses on studying the performance and competitiveness of tourism destinations of the Cape Verde islands by main outbond markets. It was used the data of monthly overnight stays in hotels for the period 2005 to 2011. For that it was used the instrument Analysis of Market Share proposed by Faulkner (1997, as well as the Gini Index and the Dissimilarity among tourist destinations in major outbound markets, to better complement the study analysis. The results showed that the islands have changed in the tourism competitiveness, presented levels of tourism competitiveness different for the various origins. Concerning the Gini Index, nationally there was a decrease in concentration of overnights. As the dissimilarity, the island of Boavista was the most singular region and São Nicolau and Brava were the most similar.

  13. Consideraciones sobre la contratación pública sostenible ("verde"

    Directory of Open Access Journals (Sweden)

    Pierre Foy Valencia

    2011-12-01

    Full Text Available Sobre la base de un enfoque de desarrollo sostenible y sistema jurídico (derecho ambiental se inserta el rol del Derecho Administrativo y cómo a modo de ejemplo se traduce en algunas instituciones legales, aterrizando en la moderna visón de la contratación y compras sostenible o verdes. Se abordan experiencias comparadas, así como la presencia de la ética y la política de tales contrataciones, los desafíos y beneficios tanto para el propio Estado en su rol de consumidor, como para la sociedad en su conjunto. Se concluye con una aproximación al actual marco legal y sus perspectivas.

  14. La química verde como plataforma para el desarrollo de materiales y procesos sustentables

    OpenAIRE

    SÁNCHEZ CERVANTES, EDUARDO M.

    2012-01-01

    La química verde provee los fundamentas básicos para evitar la contaminación innecesaria y el uso eficiente de la energía. En el presente trabajo se han utilizado líquidos iónicos (solventes de bajo impacto ecológico) para la síntesis, con base en ultrasonido de baja energía, de nanobarras de Sb2S3 que tienen una potencial aplicación en celdas solares. Asimismo, se ha logrado un estudio fisicoquímico completo de nuevos líquidos iónicos basados en fosfonios que se han u...

  15. DOS COSECHAS ANUALES DE GRANOS Y FORRAJE VERDE CON SORGOS GRANIFEROS EN CORRIENTES

    Directory of Open Access Journals (Sweden)

    Héctor Mario Cenoz

    2010-11-01

    Full Text Available En este trabajo los autores presentan los resultados de la investigación comparativa de variedades de granos de sorgo, incluyendo una variedad doble propósito, para determinar su adaptación a las condiciones ecológicas de la zona y su rendimiento en grano y forraje fresco en dos cosechas anuales. Los resultados muestran la clara superioridad de la variedad de doble propósito sobre las variedades de grano en grano y forraje verde en la producción anual (dos cosechas, pero la variedad Doble Enano tiene superioridad sobre las variedades de grano en el rendimiento (dos cosechas anuales. Cabe notar que las variedades híbridas del grano de sorgo no han superado a las no-híbridas.

  16. Genome-wide analyses of HTLV-1aD strains from Cape Verde, Africa

    Science.gov (United States)

    Zanella, Louise; de Pina-Araujo I, Isabel; Morgado, Mariza G; Vicente, Ana Carolina

    2016-01-01

    We characterised and reported the first full-length genomes of Human T-cell Lymphotropic Virus Type 1 subgroup HTLV-1aD (CV21 and CV79). This subgroup is one of the major determinants of HTLV-1 infections in North and West Africa, and recombinant strains involving this subgroup have been recently demonstrated. The CV21 and CV79 strains from Cape Verde/Africa were characterised as pure HTLV-1aD genomes, comparative analyses including HTLV-1 subtypes and subgroups revealed HTLV-1aD signatures in the envelope, pol, and pX regions. These genomes provide original information that will contribute to further studies on HTLV-1a epidemiology and evolution. PMID:27653363

  17. Sustentabilidade e Inovação: Um Estudo Sobre o Plástico Verde

    OpenAIRE

    Zambanini, Marcos Eduardo; Universidade Municipal de São Caetano do Sul - USCS; Bresciani, Luis Paulo; Universidade Municipal de São Caetano do Sul - USCS; Pereira, Raquel da Silva; Universidade Municipal de São Caetano do Sul - USCS; Souza, Dércia Antunes de; Universidade Municipal de São Caetano do Sul - USCS; Ortega, Gustavo; Universidade Municipal de São Caetano do Sul - USCS

    2013-01-01

    O presente trabalho tem por objetivo verificar a perspectiva de possível substituição do plástico oriundo dos combustíveis fósseis não renováveis e esgotáveis pelo Plástico Verde, fabricado a partir do etanol de cana-de-açúcar, recurso renovável. O estudo consiste em uma pesquisa exploratória com abordagem qualitativa, realizada mediante análise de artigos técnicos, informações disponíveis no site da empresa Braskem e entrevistas com atores empresariais envolvidos com o tema. Como um dos resu...

  18. Atividade extensionista e TI Verde conectando instituição e comunidade

    Directory of Open Access Journals (Sweden)

    Mozart Lemos de Siqueira

    2013-11-01

    Full Text Available A área conhecida como TI Verde alia a evolução da Tecnologia da Informação (TI à preservação do meio ambiente. Dentre as soluções é possível listar o aumento da vida útil dos computadores, redução e reciclagem de lixo eletrônico, equipamentos ligados somente enquanto estão sendo utilizados, virtualização e diminuição do consumo de papel em impressões desnecessárias. Neste contexto, o projeto de extensão apresentado nesse artigo faz um levantamento desses aspectos dentro do universo da instituição de ensino superior. Além disso, mostra o benefício para a comunidade.

  19. Steam generator chemical cleaning at the Palo Verde Nuclear Generating Station

    Energy Technology Data Exchange (ETDEWEB)

    Jevec, J.M. [Babcock and Wilcox, Alliance, OH (United States). R and D Division; Knollmeyer, P.M. [B and W Nuclear Technologies, Lynchburg, VA (United States); Paramithas, P. [Palo Verde Nuclear Generating Station, Tonopah, AZ (United States)

    1995-09-01

    The secondary side of the Palo Verde Units 2 and 3 steam generators were chemically cleaned in 1994. The primary purpose of the chemical cleaning was to remove deposits bridging between adjacent tubes and also to remove bulk tube and tubesheet deposits. A secondary objective was to remove deposits from the flow distribution plate-to-tube crevice. The chemical cleaning consisted of a magnetite dissolution step, a separate step aimed at removing deposits in the flow distribution plate crevices, and a final step to remove residual copper and passivate the carbon steel surfaces of the steam generator. Corrosion monitoring was employed during the cleaning to ensure that the cleaning resulted in corrosion to steam generator materials of construction that was below the predetermined chemical cleaning corrosion allowances. The process application, removal efficiency, and corrosion results are presented in this paper.

  20. The Vida Verde Women's Co-Op: Brazilian immigrants organizing to promote environmental and social justice.

    Science.gov (United States)

    Gute, David M; Siqueira, Eduardo; Goldberg, Julia S; Galvão, Heloisa; Chianelli, Mônica; Pirie, Alex

    2009-11-01

    We reviewed the key steps in the launch of the Vida Verde Women's Co-Op among Brazilian immigrant housecleaners in Somerville, MA. The co-op provides green housecleaning products, encourages healthy work practices, and promotes a sense of community among its members. We conducted in-depth interviews with 8 of the first co-op members, who reported a reduction in symptoms associated with the use of traditional cleaning agents and a new sense of mutual support. Critical to the co-op's success have been the supportive roles of its academic partners (Tufts University and the University of Massachusetts, Lowell), effective media outreach, and a focus on advancing social justice. Next steps include implementing a formal business plan and assessing the appropriateness of cooperatives in other industries.

  1. The volcanic and geochemical development of São Nicolau, Cape Verde Islands

    DEFF Research Database (Denmark)

    Duprat, Helene Inga; Holm, Paul Martin; Sherson, Jacob Friis;

    2007-01-01

    We present 34 new age results from 40 Ar/39 Ar incremental heating analyses of groundmass separates from volcanic rocks from São Nicolau, Cape Verde. Combining the age results with field observations, we show that the volcanic activity that formed the island occurred in four separate stages: 1: >6...... of 207 volcanic rocks representing all volcanic activity stages is presented. The rocks are alkaline and mostly primitive (MgO >8 wt.%) basic to ultrabasic ranging from nephelinites through basanites to picrobasalts. Evolved rocks range to phonolites. During all four volcanic stages predominantly high Mg...... assumed. With more ages of only around 50 ka the youngest volcanic rocks found on the island indicate that stage 4 may still be active. The cyclieity of São Nico volcanism suggests that mantle plume material arrived under São Nicolau in batches separated by nonfertile material....

  2. Avaliação das áreas verdes em espaços públicos no município de Guarapuava/PR

    Directory of Open Access Journals (Sweden)

    Carlos Roberto Loboda

    2005-06-01

    Full Text Available Apresenta-se neste artigo uma proposta metodológica para se avaliar o desempenho das áreas verdes públicas do Município de Guarapuava/PR, mais especificamente sua arborização de acompanhamento viário de sua área central. Guarapuava é uma cidade que conta com aproximadamente 160 mil habitantes, situada na região centro-sul do Estado. A proposta metodológica que ora se apresenta, aplicada em parcela do município, foi desenvolvida através de levantamentos diretos de campo. Por fim, apresentam-se as discussões e análises dos resultados obtidos nesta pesquisa, onde se conclui a respeito do desempenho obtido pela arborização em questão. A partir dos dados coletados nos levantamentos utilizados, tem-se um panorama global, realístico e atual não só da situação desses espaços, mas da validade, abrangência e pertinência do modelo metodológico empregado.

  3. La principal colección de periódicos sobre Canarias: la hemeroteca de la Universidad de La Laguna

    Directory of Open Access Journals (Sweden)

    Dr. Javier González Antón

    1998-01-01

    Full Text Available Descripción de uno de los más importantes fondos hemerográficos del mundo sobre las Islas Canarias, las colecciones de periódicos y revistas, desde los manuscritos del siglo XVIII, los primeros impresos de 1785, hasta la serie completa de los actuales, conservados en la Hemeroteca de Canarias de la Universidad de La Laguna, con sus servicios y prestaciones.

  4. Groundwater flow in a closed basin with a saline shallow lake in a volcanic area: Laguna Tuyajto, northern Chilean Altiplano of the Andes.

    Science.gov (United States)

    Herrera, Christian; Custodio, Emilio; Chong, Guillermo; Lambán, Luis Javier; Riquelme, Rodrigo; Wilke, Hans; Jódar, Jorge; Urrutia, Javier; Urqueta, Harry; Sarmiento, Alvaro; Gamboa, Carolina; Lictevout, Elisabeth

    2016-01-15

    Laguna Tuyajto is a small, shallow saline water lake in the Andean Altiplano of northern Chile. In the eastern side it is fed by springs that discharge groundwater of the nearby volcanic aquifers. The area is arid: rainfall does not exceed 200mm/year in the rainiest parts. The stable isotopic content of spring water shows that the recharge is originated mainly from winter rain, snow melt, and to a lesser extent from some short and intense sporadic rainfall events. Most of the spring water outflowing in the northern side of Laguna Tuyajto is recharged in the Tuyajto volcano. Most of the spring water in the eastern side and groundwater are recharged at higher elevations, in the rims of the nearby endorheic basins of Pampa Colorada and Pampa Las Tecas to the East. The presence of tritium in some deep wells in Pampa Colorada and Pampa Las Tecas indicates recent recharge. Gas emission in recent volcanoes increase the sulfate content of atmospheric deposition and this is reflected in local groundwater. The chemical composition and concentration of spring waters are the result of meteoric water evapo-concentration, water-rock interaction, and mainly the dissolution of old and buried evaporitic deposits. Groundwater flow is mostly shallow due to a low permeability ignimbrite layer of regional extent, which also hinders brine spreading below and around the lake. High deep temperatures near the recent Tuyajto volcano explain the high dissolved silica contents and the δ(18)O shift to heavier values found in some of the spring waters. Laguna Tuyajto is a terminal lake where salts cumulate, mostly halite, but some brine transfer to the Salar de Aguas Calientes-3 cannot be excluded. The hydrogeological behavior of Laguna Tuyajto constitutes a model to understand the functioning of many other similar basins in other areas in the Andean Altiplano.

  5. Modelización de la hidroquímica y sedimentoquímica de una laguna tipo playa (Cl- So2-4 Mg2+ - Na+: La Laguna Grande de Quero (Toledo

    Directory of Open Access Journals (Sweden)

    García del Cura, M. A.

    1991-08-01

    Full Text Available The «Laguna Grande de Quero», is a saline pond located on the aluvial system from the Cigüela and Riansares rivers. The pond's underground impermeable materials are claystone with gypsum from the Triassic ages. On the next reliefs appears gypsiferous-detrital and calcareous materials from the Tertiary ages. A model have been created for the evaporative process, correcting the saline effect bearing in mind the climatic parameters; the conclusions obtained are coherents with the experimental data, which have been obtained in two experimental pools placed for the evaporative- concentration processes chasing. The experimental precipitation sequence obtained was: calcite + gypsum → bloedite + thenardite → bloedite → epsomite + halite. This sequence has been studied about saits generated on the air-brine interface. Moreover coincide with the foreseeable theoric sequence, according to Valyashko diagrams. In the natural environment appears facies and paragenesis associations coherents with the experimental data. During the evaporative process to specific gravity and concentration evolution graphics show a stagnancy period, «plateau effect», that it seams to coincide with a differential heating from the depth waters. The explanation of this effect can be related with the salts dissolution previously formed.La Laguna Grande de Quero, se ubica en el sistema aluvial de los ríos Cigüela-Riansares. Los materiales del subsuelo impermeable de la laguna son lutitas con yeso del Trías. En los relieves próximos afloran materiales detrítico-yesíferos y calcáreos de edad Terciaria. Se ha establecido un modelo del proceso de evaporación, corrigiendo el efecto salino, y teniendo en cuenta los parámetros climáticos, obteniendo resultados coherentes con los datos obtenidos en las balsas experimentales instaladas para el seguimiento del proceso de evaporación-concentración de la salmuera. La secuencia de precipitación experimental

  6. Utilização de nitrogênio de adubos verde e mineral pelo milho

    Directory of Open Access Journals (Sweden)

    W. B. Scivittaro

    2000-12-01

    Full Text Available Desenvolveu-se, na Estação Experimental de Piracicaba - Instituto Agronômico (SAA-SP, de março/94 a setembro/95, um experimento para avaliar o potencial de fornecimento de nitrogênio de adubos, verde e mineral, aplicados, de forma exclusiva ou combinada, na cultura do milho. Em uma primeira fase, produziram-se, simultaneamente, mucuna-preta sem marcação isotópica no campo e adubo verde marcado com 15N em casa de vegetação e, na segunda, a mucuna-preta foi incorporada ao solo, cultivando-se, em seguida, milho. O experimento constou dos seguintes tratamentos: testemunha, 15N-mucuna-preta (4,4 t ha-1 de matéria seca e 25,8 g kg-1 de N, 15N-uréia (50 e 100 kg ha-1 de N e as possíveis combinações de mucuna-preta e uréia marcadas ou não com 15N. Esses foram dispostos em delineamento experimental de blocos ao acaso com quatro repetições. O solo forneceu a maior parte do N acumulado nas plantas de milho, seguido, em ordem decrescente, pela uréia e mucuna-preta. A contribuição da uréia para o N acumulado nas plantas de milho foi proporcional à dose aplicada. O aproveitamento de nitrogênio da uréia pelo milho foi maior que o da mucuna-preta, sendo os melhores efeitos proporcionados pela combinação das duas fontes.

  7. Production and photosynthetic activity of Mimosa Verde and Mimosa Roxa lettuce in two farming systems

    Directory of Open Access Journals (Sweden)

    Aline Mabel Rosa

    2014-08-01

    Full Text Available Lettuce (Lactuca sativa L. is the most commonly consumed leaf vegetable in the Brazilian diet, and it is a good source of vitamins and minerals. It is widely grown in the conventional farming system. However, the hydroponic farming system has been gaining importance in the market, wining confidence from consumers, who are becoming increasingly more demanding on food quality. The objective of this study was to evaluate the performance of two lettuce cultivars on hydroponic and conventional farming systems for the production of fresh mass (FM and dry mass (DM, photosynthesis, contents of chlorophyll and anthocyanin. The following two experiments were carried out: hydroponics farming (HF and conventional farming (CF, performed in protect and unprotect environments, respectively, in Florianópolis, SC. Mimosa Verde cultivar (MV showed greater fresh mass than Mimosa Roxa (MR, in both farming systems and the two cultivars presented better performance in the hydroponic system (287.7 g MV and 139.1 g MR than the conventional system (129.7 g MV and 111.8 g MR. Mimosa Verde cultivar presented lower average contents of total chlorophyll (7.7 mg g-¹ FM than Mimosa Roxa (11.8 mg g-¹FM, and both cultivars displayed higher means for this variable in the hydroponic farming system. Mimosa Roxa presented higher contents of anthocyanin in the conventional system (88.24 mg g-¹ FM than the ones in the hydroponic system (36.89 mg g-¹ FM. The best results for CO2 net assimilation rate regarded to photosyntheticaly active photon flux density were found in the hydroponic system, for both lettuce cultivars. Variation in the contents of chlorophyll were also found. Those variations were higher in the protected system than in the hydroponic system and contents of anthocyanin were higher in the conventional system.

  8. Susceptibility profile of Aedes aegypti from Santiago Island, Cabo Verde, to insecticides.

    Science.gov (United States)

    Rocha, Hélio Daniel Ribeiro; Paiva, Marcelo Henrique Santos; Silva, Norma Machado; de Araújo, Ana Paula; Camacho, Denise dos Reis da Rosa de Azevedo; Moura, Aires Januário Fernandes da; Gómez, Lara Ferrero; Ayres, Constância Flávia Junqueira; Santos, Maria Alice Varjal de Melo

    2015-12-01

    In 2009, Cabo Verde diagnosed the first dengue cases, with 21,137 cases reported and Aedes aegypti was identified as the vector. Since the outbreak, chemical insecticides and source reduction were used to control the mosquito population. This study aimed to assess the susceptibility of A. aegypti populations from Santiago, Cabo Verde to insecticides and identify the mechanisms of resistance. Samples of A. aegypti eggs were obtained at two different time periods (2012 and 2014), using ovitraps in different locations in Santiago Island to establish the parental population. F1 larvae were exposed to different concentrations of insecticides (Bacillus thuringiensis var israelensis (Bti), diflubenzuron and temephos) to estimate the lethal concentrations (LC90) and calculate the respective rate of resistance (RR90). Semi-field tests using temephos-ABATE(®) were performed to evaluate the persistence of the product. Bottle tests using female mosquitoes were carried out to determine the susceptibility to the adulticides malathion, cypermethrin and deltamethrin. Biochemical and molecular tests were performed to investigate the presence of metabolic resistance mechanisms, associated with the enzymes glutathione S-transferases (GSTs), esterases and mixed-function oxidases (MFO) and to detect mutations or alterations in the sodium channel and acetylcholinesterase genes. A. aegypti mosquitoes from Santiago exhibited resistance to deltamethrin, cypermethrin (mortalityaegypti population from Santiago is resistant to two major insecticides used for vector control, deltamethrin and temephos. To our knowledge, this is the first report of temephos resistance in an African A. aegypti population. The low level of temephos resistance was maintained from 2012-2014, which suggested the imposition of selective pressure, although it was not possible to identify the resistance mechanisms involved. These data show that the potential failures in the local mosquito control program are not

  9. Seasonal variation of aliphatic amines in marine sub-micrometer particles at the Cape Verde islands

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    C. Müller

    2009-07-01

    Full Text Available Monomethylamine (MA, dimethylamine (DMA and diethylamine (DEA were detected at non-negligible concentrations in sub-micrometer particles at the Cap Verde Atmospheric Observatory (CVAO located on the island of São Vicente in Cape Verde during algal blooms in 2007. The concentrations of these amines in five stage impactor samples ranged from 0 to 30 pg m−3 for MA, 130 to 360 pg m−3 for DMA and 5 to 110 pg m−3 for DEA during the spring bloom in May 2007 and 2 to 520 pg m−3 for MA, 100 to 1400 pg m−3 for DMA, 90 to 760 pg m−3 for DEA during an unexpected winter algal bloom in December 2007. Anomalously high Saharan dust deposition and intensive ocean layer deepening were found at the Atmospheric Observatory and the associated Ocean Observatory during algal bloom periods. The highest amine concentrations in fine particles (impactor stage 2, 0.14–0.42 μm indicates that amines are likely taken up from the gas phase into the acidic sub-micrometer particles. The contribution of amines to the organic carbon (OC content ranged from 0.2 to 2.5%C in the winter months, indicating the importance of this class of compounds to the carbon cycle in the marine environment. Furthermore, aliphatic amines originating from marine biological sources likely contribute significantly to the organic nitrogen in the marine atmosphere. The average contribution of the amines to the total detected nitrogen content in submicron particles can be non-negligible, especially in the winter months (0.1% N to 1.5% N in the sum of nitrate, ammonium and amines. This indicates that these smaller aliphatic amines can be important for the carbon and the nitrogen cycles in the remote marine environment.

  10. Seasonal variation of aliphatic amines in marine sub-micrometer particles at the Cape Verde islands

    Science.gov (United States)

    Müller, C.; Iinuma, Y.; Karstensen, J.; van Pinxteren, D.; Lehmann, S.; Gnauk, T.; Herrmann, H.

    2009-12-01

    Monomethylamine (MA), dimethylamine (DMA) and diethylamine (DEA) were detected at non-negligible concentrations in sub-micrometer particles at the Cap Verde Atmospheric Observatory (CVAO) located on the island of São Vicente in Cape Verde during algal blooms in 2007. The concentrations of these amines in five stage impactor samples ranged from 0-30 pg m-3 for MA, 130-360 pg m-3 for DMA and 5-110 pg m-3 for DEA during the spring bloom in May 2007 and 2-520 pg m-3 for MA, 100-1400 pg m-3 for DMA and 90-760 pg m-3 for DEA during an unexpected winter algal bloom in December 2007. Anomalously high Saharan dust deposition and intensive ocean layer deepening were found at the Atmospheric Observatory and the associated Ocean Observatory during algal bloom periods. The highest amine concentrations in fine particles (impactor stage 2, 0.14-0.42 μm) indicate that amines are likely taken up from the gas phase into the acidic sub-micrometer particles. The contribution of amines to the organic carbon (OC) content ranged from 0.2-2.5% C in the winter months, indicating the importance of this class of compounds to the carbon cycle in the marine environment. Furthermore, aliphatic amines originating from marine biological sources likely contribute significantly to the nitrogen content in the marine atmosphere. The average contribution of the amines to the detected nitrogen species in sub-micrometer particles can be non-negligible, especially in the winter months (0.1% N-1.5% N in the sum of nitrate, ammonium and amines). This indicates that these smaller aliphatic amines can be important for the carbon and the nitrogen cycles in the remote marine environment.

  11. Tracking effusive eruptions in near real-time: 2014 Fogo (Cape Verde) eruption

    Science.gov (United States)

    Laiolo, Marco; Coppola, Diego; Cigolini, Corrado; Faria, Bruno; Ripepe, Maurizio

    2015-04-01

    The Fogo volcano (Cape Verde), after almost 20 years of inactivity, entered in a new effusive phase on November 23, 2014. The eruption occurred on the Fogo's Pico cone inside the Cha Caldera where the lava flow caused the evacuation of the Bangaeira and Portela inhabitants. To track the thermal evolution of this eruption, we extended the near-real time processing of the MIROVA (Middle InfraRed Observation of Volcanic Activity) algorithm to Fogo island. MIROVA is a hot-spot detection system based on the analysis of the Moderate Resolution Imaging Spectroradiometer (MODIS) data that provide thermal maps (1 km resolution) and radiant flux estimates, in near real time (1-4 hours from satellite overpass). Thermal output retrieved by MIROVA can be converted into time-average lava discharge rates allowing the identification of ongoing effusive trends. During the first 45 days of activity the eruption shows a waxing-waning trend typical of pressurized closed systems. Preliminary results indicate that MIROVA is particularly efficient to provide near real-time data that are critical for better assessing volcanic risk, and to help the decision-makers during volcanic crisis. Data requested by the UNDAC (United Nations Disaster Assessment and Coordination) team operating in Cape Verde, through the Emergency Response Coordination Center (ERCC) of the European Mechanism of Civil Protection, were provided in near real-time via web to the National Institute of Meteorology and Geophysics and to National Civil Protection. Once compared to seismological data, information provided by MIROVA have been successfully used during the volcanic crisis.

  12. Período de recuperação do investimento em bomba hidráulica de melhor rendimento em sistemas de bombeamento na tarifa horossazonal verde

    OpenAIRE

    Zocoler, João L.; Hernandez,Fernando B. T.; Saad,João C. C.; Cruz,Raimundo L.

    2011-01-01

    Neste trabalho, ajustou-se um modelo matemático para quantificar o efeito da variação do rendimento da bomba hidráulica na variação dos custos de um sistema de bombeamento, na estrutura tarifária horossazonal verde (subgrupo A4) e o tempo de recuperação do capital investido no equipamento de maior rendimento. Em seguida, o mesmo foi aplicado a um sistema de bombeamento para suprimento de um sistema de irrigação do tipo pivô central. As opções de rendimento da bomba hidráulica foram: 69,5% (bo...

  13. Identification and dating of indigenous water storage reservoirs along the Rio San José at Laguna Pueblo, western New Mexico, USA

    Science.gov (United States)

    Huckleberry, Gary; Ferguson, T.J.; Rittenour, Tammy M.; Banet, Chris; Mahan, Shannon

    2016-01-01

    An investigation into indigenous water storage on the Rio San José in western New Mexico was conducted in support of efforts by the Pueblo of Laguna to adjudicate their water rights. Here we focus on stratigraphy and geochronology of two Native American-constructed reservoirs. One reservoir located near the community of Casa Blanca was formed by a ∼600 m (2000 feet) long stone masonry dam that impounded ∼1.6 × 106 m3 (∼1300 acre-feet) of stored water. Four optically stimulated luminescence (OSL) ages obtained on reservoir deposits indicate that the dam was constructed prior to AD 1825. The other reservoir is located adjacent to Old Laguna Pueblo and contains only a small remnant of its former earthen dam. The depth and distribution of reservoir deposits and a photogrammetric analyses of relict shorelines indicate a storage capacity of ∼6.5 × 106 m3 (∼5300 ac-ft). OSL ages from above and below the base of the reservoir indicate that the reservoir was constructed sometime after AD 1370 but before AD 1750. The results of our investigation are consistent with Laguna oral history and Spanish accounts demonstrating indigenous construction of significant water-storage reservoirs on the Rio San José prior to the late nineteenth century.

  14. Pesticide and PCB residues in the aquatic ecosystems of Laguna de Terminos, a protected area of the coast of Campeche, Mexico.

    Science.gov (United States)

    Carvalho, Fernando P; Villeneuve, Jean-Pierre; Cattini, C; Rendón, Jaime; Mota de Oliveira, J

    2009-02-01

    The coastal lagoon system of Laguna de Terminos, Campeche, Mexico, a natural reserve since 1994, was investigated for contamination by agricultural and industrial chemical residues. Water, sediment and biota samples were analyzed for a wide variety of organochlorine and organophosphorus compounds. Chlorpyrifos was detected in water in concentrations up to 72 pgL(-1) and, amongst organochlorine compounds, summation operator PCB were measured averaging 1177 pgL(-1) and summation operator DDT 279 pgL(-1). Residues of chlorinated compounds were present in sediments and in biota with summation operator DDT averaging 190 pg g(-1) and 5876 pg g(-1) in sediment and oysters, respectively. Results show that the more widespread contaminants in the Laguna were residues of chlorinated hydrocarbons, such as DDTs, PCBs, endosulfan, and lindane. Concentrations of residues were not at an alarming level and were even lower than reported for other costal lagoons of the region. Still there is a need to implement control measures on persistent and bioaccumulative compounds that may reach the aquatic system of Laguna de Terminos.

  15. Fuertes paleosismos de intraplaca y sus retornos vinculados a la falla Las Lagunas, Sierras Pampeanas de Cordoba Strong intraplate paleoearthquakes and their recurrence related to Las Lagunas fault, Sierras Pampeanas of Cordoba

    Directory of Open Access Journals (Sweden)

    Guillermo L Sagripanti

    2011-03-01

    Full Text Available En la intraplaca argentina, a la latitud 33°S, región sur de la provincia de Córdoba, la presencia de morfologías superficiales y deformaciones en sedimentos sueltos cuaternarios hacen suponer que la actividad tectónica neógena tuvo continuidad en el Holoceno y que seguramente fue acompañada por la ocurrencia de paleoterremotos. Los objetivos del presente trabajo son, por medio de investigaciones paleosismológicas realizar la reconstrucción del registro de la sismicidad prehistórica de la región y una estimación del potencial sismogénico de una fuente, con probada actividad cuaternaria, que sean de base en la estimación del riesgo sísmico de la región. Se excavaron seis trincheras transversales a la traza de la falla Las Lagunas, en sedimentos de origen eólico, fluvial y lagunar, en las cuales se relevaron estructuras cosísmicas, deformacionales y de licuefacción, de escala mesoscópica. Los resultados obtenidos han permitido proponer un modelo de retrodeformación para la falla, calcular el período de recurrencia de fuertes terremotos que es del orden de 1,2 - 2,0 Ka, calcular la magnitud de algunos paleo-eventos, Ms > 6,6 y hacer una estimación de la magnitud del terremoto máximo.Evidences like landforms and deformations in loose quaternary sediments, in the argentinian intraplate, at latitude 33° S, southern part of the Cordoba province, suggest that the Neogene tectonic activity continues into the Holocene and certainly had been associated to strong paleoearthquakes. The objectives of this work are to make a reconstruction of the prehistoric seis-micity record of the region by paleoseismological investigations, and to estimate the seismogenic potential of a source with proven Quaternary activity, with the aim of setting the basis to estimate the seismic risk of the region. Six trenches were dug across the trace of the Las Lagunas fault, cutting eolian, fluvial, and lagoon sediments. In the sites, several coseismic

  16. Dinámica e implicancia del aluvión de la laguna 513, Cordillera Blanca, Ancash, Perú Dinamics and implications of the laguna 513 Aluvion, Cordillera Blanca, Ancash Perú

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    Patricio Valderrama

    2012-09-01

    Full Text Available La Cordillera Blanca, al norte de Perú, es la zona con más actividad geodinámica externa en Perú. En ella ocurrieron grandes flujos de detritos de origen glaciar, varios de ellos fueron grandes desastres y cobraron miles de vidas. El 11 de abril del 2010, la laguna 513, ubicada en el centro de la Cordillera Blanca, sufrió un desembalse parcial por la caída de un gran bloque de hielo y rocas del nevado Hualcán (5500 m.s.n.m.. Este evento pese a ser de dimensiones considerables, no generó grandes pérdidas ni afectó alguna ciudad importante. Mediante simulaciones numéricas de flujo se estudió su dinámica, se determinó sus volúmenes y su turbulencia así como también explicamos e papel de la morfología de la zona en la desaceleración del flujo, su encausamiento en un valle fluvial y su posterior comportamiento como crecida de río. Las simulaciones realizadas mediante FLO2D se validan mediante comparaciones con imágenes de satélite post evento y datos de campo.The Cordillera Blanca in northern Peru is the most external geodynamics active areas in Perú. There have been occurred the biggest glacier source debris flow in the Peruvian history, most of them became on major disasters and claimed thousands of lives. On April 11th, 2010, the Laguna 513, located in the center of the Cordillera Blanca, suffered a partial GLOF due a massive rock and ice fall from Nevado Hualcán (5500 masl. This event, despite being of considerable size, did not generate large losses or affect any major city. Using numerical simulations we study the dynamics of the consequent GLOF and debris flow. We determined the volume and turbulence as well as also explained the role of the geomorphology of the area in the flow deceleration process and the river flood subsequent behavior. The FLO 2D simulations are validated with post event satellite image and field data.

  17. INFLUÊNCIA DOS STAKEHOLDERS NA ADOÇÃO DE ESTRATÉGIAS DE MARKETING VERDE

    Directory of Open Access Journals (Sweden)

    Benny Kramer Costa

    2012-01-01

    Full Text Available Este artigo tem como objetivo conhecer de que forma os stakeholders influenciam na adoção de estratégias de marketing verde sob a ótica da empresa Alfa, uma indústria moveleira situada no Rio Grande do Norte, Brasil. A metodologia utilizada teve uma abordagem qualitativa e utiliza o método do estudo de caso exploratóriodescritivo como modelo formal e sistemático do estudo científico. Segue as proposições teórico-conceituais de Polonsky (1995, Michell, Angle e Wood (1997 e Frooman (1999 como referências básicas que identifica e avalia o grau de importância dos stakeholders relevantes, mostra suas expectativas e necessidades e descreve as táticas utilizadas pelas empresas para a implantação de estratégias de marketing verde. O estudo descreve a realidade de uma indústria moveleira do Rio Grande do Norte, Brasil e mostra sua filosofia e contexto; identifica os stakeholders presentes, analisa o grau de importância de cada grupo relevante e mostra suas necessidades e expectativas e por fim, constata as mudanças ocorridas na organização na implantação de estratégias de marketing verde. A partir dos resultados obtidos conclui que os stakeholders são levados em consideração na adoção de estratégias de marketing verde, mesmo a empresa não possuindo a devida percepção estratégica necessária para avançar na adoção da filosofia do marketing verde. Este estudo de caso explora conhecimentos que podem ser apropriados e adequados por empresas de pequeno porte que atuem nesse segmento-tendência estratégico do marketing verde.

  18. Histology of the liver of Oligosarcus jenynsii (Ostariophysi, Characidae from Los Padres Lake, Argentina Histología del hígado de Oligosarcus jenynsii (Ostariophysi, Characidae de la Laguna de Los Padres, Argentina

    Directory of Open Access Journals (Sweden)

    Gladys M. Petcoff

    2006-06-01

    Full Text Available The liver is an organ notable for its sensitivity to a great variety of environmental factors. It is composed of a parenchyma divided into irregular lobules by the exocrine pancreas or hepatopancreas; the pancreatic cells are arranged around a branch of the portal vein. The hepatocytes are radially arranged in cords around a central sinusoid. The liver histomorphology and the organization of exocrine pancreatic tissue of O. jenynsii (Günther, 1864 is similar to the acinar morphology of many teleosts, including freshwater and marine species. The aim of the present work was to carry out the histological analysis of the liver of Oligosarcus jenynsii, one of the most common species inhabiting Los Padres Lake (Buenos Aires Province, Argentina.El dientudo Oligosarcus jenynsii (Günther, 1864 es una de las especies más comunes que habita en la Laguna de Los Padres. Se ha realizado el análisis histológico del hígado del dientudo, un órgano destacable por su sensibilidad a una variedad de factores del medio ambiente. El hígado está compuesto por un parénquima con hepatocitos dispuestos en cordones alrededor de un sinusoide central. El parénquima se halla dividido en lóbulos irregulares por el páncreas exócrino o hepatopáncreas, que posee una disposición acinar y cuyas células se organizan alrededor de una rama de la vena porta. La histomorfología del hígado y la organización del tejido pancreático exócrino de Oligosarcus jenynsii es similar a la de muchos peces teleósteos, tanto marinos como de agua dulce.

  19. Priorização de práticas verdes em GSCM: estudo de casos com empresas da indústria do pêssego

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    Miguel Afonso Sellitto

    Full Text Available Resumo O objetivo deste artigo é definir prioridades para as práticas verdes que são observadas em cadeias de suprimentos da indústria do pêssego. O método de pesquisa é a modelagem qualiquantitativa. As unidades de análise são quatro empresas focais da cadeia de suprimentos da indústria do pêssego da região de Pelotas. Foi elaborado um modelo para estruturar práticas verdes observadas na indústria, a partir da literatura sobre GSCM (Gestão Verde da Cadeia de Suprimento. O modelo inclui três construtos: Estratégia, Inovação e Operações. Dezesseis práticas verdes presentes na literatura foram distribuídas entre os construtos. Um grupo focado de três especialistas adaptou o modelo à indústria do pêssego de Pelotas, eliminando três práticas. As restantes foram priorizadas por gestores das empresas com apoio do método AHP de análise multicriterial. Com base no resultado, cinco práticas foram consideradas prioritárias para a indústria: Ecodesign, Cooperação, Avaliação de Desempenho, Compras Verdes e Manufatura Verde, nesta ordem.

  20. Linking microbial assemblages to paleoenvironmental conditions from the Holocene and Last Glacial Maximum times in Laguna Potrok Aike sediments, Argentina

    Science.gov (United States)

    Vuillemin, Aurele; Ariztegui, Daniel; Leavitt, Peter R.; Bunting, Lynda

    2014-05-01

    Laguna Potrok Aike is a closed basin located in the southern hemisphere's mid-latitudes (52°S) where paleoenvironmental conditions were recorded as temporal sedimentary sequences resulting from variations in the regional hydrological regime and geology of the catchment. The interpretation of the limnogeological multiproxy record developed during the ICDP-PASADO project allowed the identification of contrasting time windows associated with the fluctuations of Southern Westerly Winds. In the framework of this project, a 100-m-long core was also dedicated to a detailed geomicrobiological study which aimed at a thorough investigation of the lacustrine subsurface biosphere. Indeed, aquatic sediments do not only record past climatic conditions, but also provide a wide range of ecological niches for microbes. In this context, the influence of environmental features upon microbial development and survival remained still unexplored for the deep lacustrine realm. Therefore, we investigated living microbes throughout the sedimentary sequence using in situ ATP assays and DAPI cell count. These results, compiled with pore water analysis, SEM microscopy of authigenic concretions and methane and fatty acid biogeochemistry, provided evidence for a sustained microbial activity in deep sediments and pinpointed the substantial role of microbial processes in modifying initial organic and mineral fractions. Finally, because the genetic material associated with microorganisms can be preserved in sediments over millennia, we extracted environmental DNA from Laguna Potrok Aike sediments and established 16S rRNA bacterial and archaeal clone libraries to better define the use of DNA-based techniques in reconstructing past environments. We focused on two sedimentary horizons both displaying in situ microbial activity, respectively corresponding to the Holocene and Last Glacial Maximum periods. Sequences recovered from the productive Holocene record revealed a microbial community adapted to