WorldWideScience

Sample records for radiation nuevas magnitudes

  1. Radiation doses - maps and magnitudes

    International Nuclear Information System (INIS)

    1989-01-01

    A NRPB leaflet in the 'At-a-Glance' Series presents information on the numerous sources and magnitude of exposure of man to radiation. These include the medical use of radiation, radioactive discharges to the environment, cosmic rays, gamma rays from the ground and buildings, radon gas and food and drink. A Pie chart represents the percentage contribution of each of those sources. Finally, the terms becquerel, microsievert and millisievert are explained. (U.K.)

  2. Magnitudes and units in radiation protection

    International Nuclear Information System (INIS)

    2005-01-01

    This sheet provides definition and information on the ionizing radiations, the measurement of a ionizing radiation magnitude by a radioactive source (the becquerel), the measurement of the ionizing radiation energy absorbed by the organism (the gray), the biological impact evaluation of ionizing radiations in function of their nature (the sievert) and the evaluation and comparison of biological risks bond to little doses (dose efficiency). (A.L.B.)

  3. New ICRU quantities for the environmental and individual monitoring. Standardization of individual dosemeters by using external beams of photon radiation; Nuevas magnitudes ICRU para la vigilancia radiologica ambiental e individual. Calibracion de dosimetros personales usando haces externos de fotones

    Energy Technology Data Exchange (ETDEWEB)

    Brosed, A; Delgado, A; Granados, C E

    1987-07-01

    The quantities introduced by ICRU for the radiological monitoring are commented, specially those implied in individual protection against external photons. A procedure is proposed in order to standardize the individual dosemeters by using the kerma in air references of CIEMAT-JEN. The reference radiation beams are described in connection with ISO standards. Provisional values are selected for the appropriate conversion and correction factors. (Author) 23 refs.

  4. Low Magnitude Occupational Radiation Exposures Are They Safe or Unsafe

    International Nuclear Information System (INIS)

    Ravichandran, R.

    2013-01-01

    Man has always been exposed to ionizing radiation from natural sources and background exposure varies with the locations. No deleterious effects have been uniquely correlated, either they are not produced at low levels of exposure or their frequency is too low to be statistically observable. Direct source of information on radiation hazards in man is obviously based on follow up of population groups exposed to certain levels of radiation. Harmful effects of ionizing radiations are traced to documented exposures; for radiologists during 1920 s and 30 s, miners exposed to airborne radioactivity, workers in the radium industry, follow-up data of Japanese nuclear bomb survivors of Hiroshima and Nagasaki, the Marshallese accident in 1954, and the victims of the limited number of accidents at nuclear installations including Chernobyl. Mostly these information are from situations involving higher doses and dose rates. Ionizing radiations have been used extensively on the peaceful applications of atomic energy in general and medical applications in particular have shown to outweigh benefits over the risks. Personnel, low magnitude of exposures are encountered during routine work in handling radiation sources. In the light of present knowledge there is need to reassess the quantum of actual risk instead of projected risk based on long time models. The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) described models for dose-response relationships and micro-dosimetric arguments for defining low doses. The definition of low doses could also be based on direct observations in experimental or epidemiological studies. Through measurement of cell damage or death using human lymphocytes, linear and quadratic terms have been fitted the response and low doses have been judged to be 20-40 mSv. Data derived from epidemiological studies, mainly the atomic bomb survivors, suggests that for solid tumours and leukaemia, 200 mSv could be considered the

  5. Nature and magnitude of the problem of spent radiation sources

    International Nuclear Information System (INIS)

    1991-09-01

    Various types of sealed radiation sources are widely used in industry, medicine and research. Virtually all countries have some sealed sources. The activity in the sources varies from kilobecquerels in consumer products to hundreds of pentabecquerels in facilities for food irradiation. Loss or misuse of sealed sources can give rise to accidents resulting in radiation exposure of workers and members of the general public, and can also give rise to extensive contamination of land, equipment and buildings. In extreme cases the exposure can be lethal. Problems of safety relating to spent radiation sources have been under consideration within the Agency for some years. The first objective of the project has been to prepare a comprehensive report reviewing the nature and background of the problem, also giving an overview of existing practices for the management of spent radiation sources. This report is the fulfilment of this first objective. The safe management of spent radiation sources cannot be studied in isolation from their normal use, so it has been necessary to include some details which are relevant to the use of radiation sources in general, although that area is outside the scope of this report. The report is limited to radiation sources made up of radioactive material. The Agency is implementing a comprehensive action plan for assistance to Member States, especially the developing countries, in all aspects of the safe management of spent radiation sources. The Agency is further seeking to establish regional or global solutions to the problems of long-term storage of spent radiation sources, as well as finding routes for the disposal of sources when it is not feasible to set up safe national solutions. The cost of remedial actions after an accident with radiation sources can be very high indeed: millions of dollars. If the Agency can help to prevent even one such single accident, the cost of its whole programme in this field would be more than covered. Refs

  6. Mechanism of SOA Formation Determines Magnitude of Radiative Effects

    Science.gov (United States)

    Zhu, J.; Penner, J.; Lin, G.; Zhou, C.

    2017-12-01

    Secondary organic aerosol (SOA) nearly always exists as an internal mixture and the distribution of this mixture depends on the formation mechanism of SOA. A model is developed to examine the influence of using an internal mixing states based on the mechanism of formation and to estimate the radiative forcing of SOA in the future. For the present day, 66 % of SOA is internally mixed with sulfate, while 34 % is internally mixed with primary soot. When compared with using an external mixture, the direct effect of SOA is decreased, due to the decrease of total aerosol surface area and the increase of absorption efficiency. Aerosol number concentrations are sharply reduced and this is responsible for a large decrease in the cloud albedo effect. In total, internal mixing suppresses the radiative effect of SOA by a factor of >4 compared to treating SOA as an external mixture. The future SOA burden increases by 24% due to CO2 increases and climate change, leading to a total (direct plus cloud albedo) radiative forcing of -0.05 W m-2. When the combined effects of changes in climate, anthropogenic emissions and land use are included, the SOA forcing is -0.07 W m-2, even though the SOA burden only increases by 6.8%. This is caused by the substantial increase of SOA associated with sulfate in the Aitken mode. The Aitken mode increase contributes to the enhancement of first indirect radiative forcing, which dominates the total radiative forcing.

  7. Magnitudes and units in radiation protection; Grandeurs et unites en radioprotection

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    This sheet provides definition and information on the ionizing radiations, the measurement of a ionizing radiation magnitude by a radioactive source (the becquerel), the measurement of the ionizing radiation energy absorbed by the organism (the gray), the biological impact evaluation of ionizing radiations in function of their nature (the sievert) and the evaluation and comparison of biological risks bond to little doses (dose efficiency). (A.L.B.)

  8. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative magnitudes ICRU, for external fields of beta radiation. Part I. Study of the homogeneity of the response personal dosemeters leaves (cards G-1, TLD-100), in radiation fields of Co{sub 60}; Medicion de dosis equivalente con dosimetros personales e instrumentos de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte I. Estudio de la homogeneidad de la respuesta dosimetros personales (tarjetas G-1, TLD-100), en campos de radiacion de Co{sub 60}

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-01-15

    A sample of 40 composed personal dosemeters by cards model: G-l, (each card is made up of two TLD-100 crystals encapsulated in teflon), Harshaw trademark; those personal dosemeters present a free window and another with a filter of A1 of 171.7 mg cm{sup -2} of mass thickness.The objective of the work is to select of this sample of 40 personal dosemeters a population with the same stocking and standard deviation. The technique used is that of comparison of stockings, (ANOVA; Variance Analysis, when samples of the same one were had size; and/or GLM, Widespread Lineal Models, when the samples were of different size), by means of the use of those Duncan statistics, SNK, Tukey, Gabriel; the results are validated proving the kindness of adjustment of the experimental data to a Normal distribution by means of the Shapiro-Wilks statistics.The experimental design used consists on a test of two vias: a via is the variable card with two levels, (crystal 1 and 2), the other via is the variable irradiation position with four levels, (LS=left superior, SR= right superior, LI= left Inferior, IR = right inferior). The irradiations carried out in blocks of four personal dosemeters in a gamma radiation beam range of Cobalt 60; carrying out three repetitions of the design. With object of proving the homogeneity of the filter of A1 in those personal dosemeters the experimental design was executed for those cards without personal dosemeters.They were also carried out tests of stockings to the readings of bottom and sensibility of the reader equipment, (Harshaw, model marks 2271), certain that doesn{sup t} exist differences for sequence of reading, but if in the stockings of the sensibility, (they were 4 different populations). The responses of the dosemeters were corrected subtracting him the reading correspondence of bottom and by sensibility of the reader equipment before subjecting them to the tests of stockings mentioned. Of the results of the tests of stockings for the cards with

  9. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative quantities ICRU, for external fields of beta radiation. Part II. I study of the angular response of personal dosemeters TLD-100 in secondary patron fields of beta radiation ({sup 90}Sr / {sup 90}Y); Medicion de dosis equivalente con dosimetros personales e instrumentos de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte II. Estudio de la respuesta angular de dosimetros personales TLD-100 en campos patrones secundarios de radiacion beta ({sup 90}Sr/{sup 90}Y)

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-01-15

    The objective of this work is to carry out one of the possible ones test type for personal dosemeters TLD, under the recomendations of the ICRU 39, ICRU 43 and the draft of the norm ISO 6980,(1992), with the purpose of verifying the capacity of these detectors to carry out the operative unit: H' (0.07;{alpha}). Since H' (O. 07;{alpha}) this defined one in an expanded field, one of these tests type consist on determining the angular response of these detectors. 20 personal dosemeters TLD-100 was used, (card marks: Harshaw, Model: G-1, with two glasses of TLD-100 absorbed in teflon; the portadosemeters has two windows, a free one and another with a filter of Pb of 171.0 mg cm{sup -2}); these dosemeters they were previously selected, [to see, {sup S}tudy of the Homogeneity of the response of Personal Dosemeters (Cards G-l, TLD-100) in Radiation of Countrysides of {sup 60}Co{sup ,} J.T. Alvarez R. Technician Report GSR/IT/0001/94].The irradiations to effectued in secondary countryside of radiation beta of {sup 90}Sr/{sup 90}Y. The study was undertaken by means of an experimental design of blocks random that contemplate the following variables: intensity of the radiation source, (1850 MBq and 74 MBq); position of irradiation, (four positions); incidence of angle of the radiation (0, 15, 30, 45, 60 and 75 grades) and the absorbed dose in air, (0.005, 0.010, 0.020, 0.050 and 0.100 Gy). Then null hypothesis it was to suppose that there was not difference among the stockings of each treatment, to used the statistical of Duncan to carry out tests of stockings at a level of significance of 5%.These tests of stockings throw the following results in those variables of the experimental design: The irradiations carried out so much with the source pattern secondary of {sup 90}Sr/{sup 90}Y of 1850 MBq and of 74 MBq, they are equivalent reason why they can be used indistinctly. The responses of each one of the glasses of the card are strongly anisotropic for each glass

  10. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative magnitudes ICRU, for external fields of radiation beta. Part IV. Survey of the angular response of instruments used in radiological protection in secondary patron fields of beta radiation ({sup 90}Sr/{sup 90}Y (1850 MBq and 74 MBq), {sup 204}TI (18.5 MBq) and {sup 147}Pm (518 MBq)); Medicion de dosis equivalente con dosimetros personales e instrumentacion de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte IV. Estudio de la respuesta angular de instrumentos empleados en proteccion radiologica en campos patrones secundarios de radiacion beta ({sup 90}Sr/{sup 90}Y (1850 MBq y 74 MBq), {sup 204}TI (18.5 MBq) y {sup 147}Pm(518 MBq))

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-02-15

    Tests type were made (type test) in the following commercial instrumentation commonly used in radiological protection: Geiger-Mueller Counters (FH40 FE), Plastic Scintillators (NE-BP/6/4A), Ionization Chambers (RO-5) and Proportional Counters (HP-100A; gas:P-10). With object of checking the possibility that these they can carry out the new operative unit ICRU, H' (0.07; {alpha}). The tests consisted on determining the energy and angular response of the detectors in secondary patron fields of beta radiation, for isotopes of {sup 90}Sr/{sup 90}Y (1850 MBq and 74 MBq and {sup 147}Pm(518 MBq). The results show the inadequate of these commercial instruments for the realization of the H' operative unit (0.07; {alpha}) in beta external fields. Due to flaws in the design, construction and calibration of the instruments for this type of radiation fields (Author)

  11. Didactic revision of the operative magnitudes system ICRU for the evaluation of the equivalent dose in radiation external fields

    International Nuclear Information System (INIS)

    Alvarez R, J. T.

    2014-10-01

    In this work is presented in a didactic way the operative magnitudes system ICRU, showing as these magnitudes carry out an appropriate estimate of the effective equivalent doses H E and the effective dose. The objective is to present the basic concepts of the dosimetry for radiation external fields with purposes of radiological protection, because the assimilation lack and technological development of this dosimetric magnitudes system has persisted for near 50 years, in terms of practice of the radiological protection in Mexico. Also, this system is an essential part of safety basic standards of the IAEA and ICRP recommendations 26, 60, 74 and 103, as well as of the ICRU 25, 39, 43, 51 and 57. (Author)

  12. Magnitude and pattern of Arctic warming governed by the seasonality of radiative forcing.

    Science.gov (United States)

    Bintanja, R; Krikken, F

    2016-12-02

    Observed and projected climate warming is strongest in the Arctic regions, peaking in autumn/winter. Attempts to explain this feature have focused primarily on identifying the associated climate feedbacks, particularly the ice-albedo and lapse-rate feedbacks. Here we use a state-of-the-art global climate model in idealized seasonal forcing simulations to show that Arctic warming (especially in winter) and sea ice decline are particularly sensitive to radiative forcing in spring, during which the energy is effectively 'absorbed' by the ocean (through sea ice melt and ocean warming, amplified by the ice-albedo feedback) and consequently released to the lower atmosphere in autumn and winter, mainly along the sea ice periphery. In contrast, winter radiative forcing causes a more uniform response centered over the Arctic Ocean. This finding suggests that intermodel differences in simulated Arctic (winter) warming can to a considerable degree be attributed to model uncertainties in Arctic radiative fluxes, which peak in summer.

  13. The evaluation the magnitude radiation exposure dose rate in digital radiography room design

    Science.gov (United States)

    Dwiyanto, Agung; Setia Budi, Wahyu; Hardiman, Gagoek

    2017-12-01

    This study discusses the dose rate in digital radiography room, buit according to meet the provisions of KEMENKES No.1014 / Menkes / SK / XI / 2008 and Regulation of BAPETEN No. 8 / 2011. The provisions primary concern of radiation safety, not comfort, by considering the space design. There are five aspects to consider in designing the space: functionality, comfort, security, movement activities and aesthetics. However provisions only met three aspects of the design, which are a function, security and movement activity. Therefore, it is necessary to evaluate digital radiography room in terms of its ability to control external radiation exposure to be safe and comfortable The dose rate is measured by the range of primary and secondary radiation in the observation points by using Surveymeter. All data are obtained by the preliminary survey prior to the study. Furthermore, the review of digital radiography room is done based on architectural design theory. The dose rate for recommended improvement room is recalculated using the same method as the actual room with the help of computer modeling. The result of dose rate calculation at the inner and outer part of digital radiography observation room shows that in-room dose for a week at each measuring point exceeds the allowable dose limit both for staff and public. During a week of observation, the outdoor dose at some measuring points exceeds the dose limit set by the KEMENKES No.1014 / Menkes / SK / XI / 2008 and Regulation BEPETEN No 8/2011. Meanwhile, the result of dose rate calculation in the inner and outer part of the improved digital radiography room can meet the applicable regulations better.

  14. Magnitude estimate of occupational risks located in a radiative facility and its main health impacts

    International Nuclear Information System (INIS)

    Alves, Alice dos Santos; Gerulis, Eduardo; Carneiro, Janete C.G.G.

    2014-01-01

    The work routine of Radiopharmacy Center (CR) personnel of the Institute of Energy Research and Nuclear (IPEN / CNEN-SP) includes singularities not exist in other professions. Relevant examples to this study can be cited: exposure to physical, chemical, biological hazards, to accidents and ergonomic risks. The objective of this study is to conduct a quantitative and qualitative evaluation of occupational exposure existing in the workplace and its impact on the health of occupationally exposed individuals (IOE's). The proposed methodology was based on systematic observation and a questionnaire to the managers of each practice held at CR. The evaluation process involved three steps: a) characterization of exposure; b) identification of the main points of exposure and possible routes of exposure; c) quantifying of exposure. Seventeen occupational agents related to the tasks of different groups of IOE's were identified. Ionizing radiation (physical risk) and the situations that cause stress (ergonomic risk) had the highest frequencies. According to the applied methodology risks was considered mostly acceptable. Quantification of exposure was basically referring to physical risk agent (Ionizing radiation), because it is a radioactive installation. Based on the records analyzed, not was observed health risks to workers arising from the activities undertaken

  15. Magnitude of Solar Radiation Torque in the Transition Region from the Umbra to the Dark Shadow of the Earth

    International Nuclear Information System (INIS)

    Cabette, R E S; Kolesnikov, I; Zanardi, M C

    2015-01-01

    The analysis of solar radiation pressure force and its influence on the motion of artificial satellites has been developed by researchers. Accurate models to describe the influence of the Earth's shadow on the torque and force due to solar radiation pressure have been presented. In this work the solar radiation torque (SRT) and its influence on the attitude of an artificial satellite are taken into account by the introduction of the Earth's shadow function in the equations of motion. This function assumes a unitary value when the satellite is in the fully illuminated region of its orbit, and the value zero for the full shade region. The main objective of this study is to analyze the magnitude of SRT using the equations described by quaternions during a 35 day period and to compare the results with the satellite transition through the shadow region and the time interval in this region. The duration and transition through the shadow region were obtained using the software 'Shadow Conditions of Earth Satellites'. The formulation is applied to the Brazilian Data Collection Satellites SCD1 and SCD2, and the torque model is presented in terms of the satellite attitude quaternion, distance of the satellite to the Sun, orbital elements, right ascension and declination of the Sun. (paper)

  16. Didactic revision of the operative magnitudes system ICRU for the evaluation of the equivalent dose in radiation external fields; Revision didactica del sistema de magnitudes operativas ICRU para la evaluacion de la dosis equivalente en campos externos de radiacion

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J. T., E-mail: trinidad.alvarez@inin.gob.mx [ININ, Departamento de Metrologia de Radiaciones Ionizantes, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    In this work is presented in a didactic way the operative magnitudes system ICRU, showing as these magnitudes carry out an appropriate estimate of the effective equivalent doses H{sub E} and the effective dose. The objective is to present the basic concepts of the dosimetry for radiation external fields with purposes of radiological protection, because the assimilation lack and technological development of this dosimetric magnitudes system has persisted for near 50 years, in terms of practice of the radiological protection in Mexico. Also, this system is an essential part of safety basic standards of the IAEA and ICRP recommendations 26, 60, 74 and 103, as well as of the ICRU 25, 39, 43, 51 and 57. (Author)

  17. New approach of determinations of earthquake moment magnitude using near earthquake source duration and maximum displacement amplitude of high frequency energy radiation

    Energy Technology Data Exchange (ETDEWEB)

    Gunawan, H.; Puspito, N. T.; Ibrahim, G.; Harjadi, P. J. P. [ITB, Faculty of Earth Sciences and Tecnology (Indonesia); BMKG (Indonesia)

    2012-06-20

    The new approach method to determine the magnitude by using amplitude displacement relationship (A), epicenter distance ({Delta}) and duration of high frequency radiation (t) has been investigated for Tasikmalaya earthquake, on September 2, 2009, and their aftershock. Moment magnitude scale commonly used seismic surface waves with the teleseismic range of the period is greater than 200 seconds or a moment magnitude of the P wave using teleseismic seismogram data and the range of 10-60 seconds. In this research techniques have been developed a new approach to determine the displacement amplitude and duration of high frequency radiation using near earthquake. Determination of the duration of high frequency using half of period of P waves on the seismograms displacement. This is due tothe very complex rupture process in the near earthquake. Seismic data of the P wave mixing with other wave (S wave) before the duration runs out, so it is difficult to separate or determined the final of P-wave. Application of the 68 earthquakes recorded by station of CISI, Garut West Java, the following relationship is obtained: Mw = 0.78 log (A) + 0.83 log {Delta}+ 0.69 log (t) + 6.46 with: A (m), d (km) and t (second). Moment magnitude of this new approach is quite reliable, time processing faster so useful for early warning.

  18. New approach of determinations of earthquake moment magnitude using near earthquake source duration and maximum displacement amplitude of high frequency energy radiation

    Science.gov (United States)

    Gunawan, H.; Puspito, N. T.; Ibrahim, G.; Harjadi, P. J. P.

    2012-06-01

    The new approach method to determine the magnitude by using amplitude displacement relationship (A), epicenter distance (Δ) and duration of high frequency radiation (t) has been investigated for Tasikmalaya earthquake, on September 2, 2009, and their aftershock. Moment magnitude scale commonly used seismic surface waves with the teleseismic range of the period is greater than 200 seconds or a moment magnitude of the P wave using teleseismic seismogram data and the range of 10-60 seconds. In this research techniques have been developed a new approach to determine the displacement amplitude and duration of high frequency radiation using near earthquake. Determination of the duration of high frequency using half of period of P waves on the seismograms displacement. This is due tothe very complex rupture process in the near earthquake. Seismic data of the P wave mixing with other wave (S wave) before the duration runs out, so it is difficult to separate or determined the final of P-wave. Application of the 68 earthquakes recorded by station of CISI, Garut West Java, the following relationship is obtained: Mw = 0.78 log (A) + 0.83 log Δ + 0.69 log (t) + 6.46 with: A (m), d (km) and t (second). Moment magnitude of this new approach is quite reliable, time processing faster so useful for early warning.

  19. New approach of determinations of earthquake moment magnitude using near earthquake source duration and maximum displacement amplitude of high frequency energy radiation

    International Nuclear Information System (INIS)

    Gunawan, H.; Puspito, N. T.; Ibrahim, G.; Harjadi, P. J. P.

    2012-01-01

    The new approach method to determine the magnitude by using amplitude displacement relationship (A), epicenter distance (Δ) and duration of high frequency radiation (t) has been investigated for Tasikmalaya earthquake, on September 2, 2009, and their aftershock. Moment magnitude scale commonly used seismic surface waves with the teleseismic range of the period is greater than 200 seconds or a moment magnitude of the P wave using teleseismic seismogram data and the range of 10-60 seconds. In this research techniques have been developed a new approach to determine the displacement amplitude and duration of high frequency radiation using near earthquake. Determination of the duration of high frequency using half of period of P waves on the seismograms displacement. This is due tothe very complex rupture process in the near earthquake. Seismic data of the P wave mixing with other wave (S wave) before the duration runs out, so it is difficult to separate or determined the final of P-wave. Application of the 68 earthquakes recorded by station of CISI, Garut West Java, the following relationship is obtained: Mw = 0.78 log (A) + 0.83 log Δ+ 0.69 log (t) + 6.46 with: A (m), d (km) and t (second). Moment magnitude of this new approach is quite reliable, time processing faster so useful for early warning.

  20. Leguminosas nuevas de Colombia

    Directory of Open Access Journals (Sweden)

    Uribe Uribe Lorenzo

    1947-12-01

    Full Text Available El presente estudio se ocupa de tres nuevas especies del género Inga, dos de las cuales presentan caracteres muy notables en el género. La gentileza del doctor E. P. Killip, del Museo Nacional de los Estados Unidos, me permite incluir aquí una nueva especie del genero Machaerium; descrita por el y tipificada en un ejemplar colectado por mi en la región de Urabá.

  1. Ultra-low-dose CT imaging of the thorax: decreasing the radiation dose by one order of magnitude

    International Nuclear Information System (INIS)

    Lambert, Lukas; Banerjee, Rohan; Votruba, Jiri; El-Lababidi, Nabil; Zeman, Jiri

    2016-01-01

    Computed tomography (CT) is an indispensable tool for imaging of the thorax and there is virtually no alternative without associated radiation burden. The authors demonstrate ultra-low-dose CT of the thorax in three interesting cases. In an 18-y-old girl with rheumatoid arthritis, CT of the thorax identified alveolitis in the posterior costophrenic angles (radiation dose = 0.2 mSv). Its resolution was demonstrated on a follow-up scan (4.2 mSv) performed elsewhere. In an 11-y-old girl, CT (0.1 mSv) showed changes of the right collar bone consistent with chronic recurrent multifocal osteomyelitis. CT (0.1 mSv) of a 9-y-old girl with mucopolysaccharidosis revealed altogether three hamartomas, peribronchial infiltrate, and spine deformity. In some indications, the radiation dose from CT of the thorax can approach that of several plain radiographs. This may help the pediatrician in deciding whether 'gentle' ultra-low-dose CT instead of observation or follow-up radiographs will alleviate the uncertainty of the diagnosis with little harm to the child. (author)

  2. The influence of radiation dose on the magnitude and kinetics of reoxygenation in a C3H mammary carcinoma

    International Nuclear Information System (INIS)

    Grau, C.; Overgaard, J.

    1990-01-01

    The variation in hypoxic fraction as a function of time after various priming doses of radiation has been investigated in a C3H mouse mammary carcinoma in situ. The hypoxic fraction was calculated from data for local tumor control. Untreated tumors were found to contain 4.8% radiobiologically hypoxic cells. Within minutes after a priming dose of 20 Gy given in air, the hypoxic fraction increased to a value not significantly different from 100%. After 4 h, reoxygenation was complete (hypoxic fraction 1.3%), and the hypoxic fraction stabilized at a level significantly below the untreated value. Following a priming dose of 40 Gy the reoxygenation pattern was different: The hypoxic fraction stayed above the pretreatment value for 4 h, and pronounced reoxygenation occurred after 12 h (hypoxic fraction 0.4%). At longer time intervals the hypoxic fraction again increased to--and slightly above--the oxygenation level of untreated tumors. The present findings show that reoxygenation in solid tumors is a function of radiation dose, and the data suggest that mechanisms other than a decrease in tumor cell O2 consumption are involved in tumor reoxygenation

  3. Moments, magnitudes, and radiated energies of non-volcanic tremor near Cholame, CA, from ground motion spectra at UPSAR

    Science.gov (United States)

    Fletcher, J. B.; McGarr, A.

    2011-08-01

    By averaging the spectra of events within two episodes of tremor (on Jan. 21 and 24, 2005) across the 12 stations of UPSAR, we improved the S/N sufficiently to define source spectra. Analysis of eleven impulsive events revealed attenuation-corrected spectra of displacement similar to those of earthquakes, with a low-frequency plateau, a corner frequency, and a high frequency decay proportional to f-2. Seismic moments, M0, estimated from these spectra range from about 3 to 10 × 1011 N-m or moment magnitudes in the range 1.6 to 1.9. The corner frequencies range from 2.6 to 7.2 Hz and, if interpreted in the same way as for earthquakes, indicate low stress drops that vary from 0.001 to 0.04 MPa. Seismic energies, estimated from the ground motion spectra, vary from 0.2 × 105 to 4.4 × 105 J, or apparent stresses in the range 0.002 to 0.02 MPa. The low stress parameters are consistent with a weak fault zone in the lower crust at the depth of tremor. In contrast, the same analysis on a micro-earthquake, located near Cholame (depth = 10.3 km), revealed a stress drop of 0.5 MPa and an apparent stress of 0.02 MPa. Residual spectra from ω-2 model fits to the displacement spectra of the non-volcanic tremor events show peaks near 4 Hz that are not apparent in the spectra for the microearthquake nor for the spectrum of earth noise. These spectral peaks may indicate that tremor entails more than shear failure reminiscent of mechanisms, possibly entailing fluid flow, associated with volcanic tremor or deep volcanic earthquakes.

  4. Estado Nueva Esparta

    Directory of Open Access Journals (Sweden)

    Cecilia Bracho Toro

    2007-01-01

    Full Text Available Se diagnostica la situación actual de los conocimientos tradicionales de la palma datilera, sus derivados y su uso como atractivo turístico cultural del Municipio Díaz, Estado Nueva Esparta. Es un estudio descriptivo y de campo realizado específicamente en la comunidad de Fuentidueño, basado en entrevistas semi-estructuradas. Se concluye que la comunidad posee un cúmulo de conocimientos tradicionales, basados en saberes. Existe poca participación de las nuevas generaciones, en aprender los conocimientos tradicionales respecto al datilero y sus derivados. Se formulan recomendaciones: legales, educativos y comunitarias para la incorporación de los conocimientos tradicionales del datilero y sus derivados dentro de los atractivos turísticos culturales del Municipio.

  5. Increase by order of magnitude in quality factor during Cherenkov radiation detection in samples on solid carriers in glass cuvettes Kavalier

    International Nuclear Information System (INIS)

    Podracka, E.; Tykva, R.

    The method of measuring Cherenkov radiation is discussed developed by the authors, based on measuring samples on a solid carrier in glass scintillation cuvettes Kavalier. Increased interaction of emitted beta particles and modified measurement configuration were achieved by putting polyethylene foils of 0.3 mm in thickness and 17 mm in diameter straight to the sample or inserting a polyethylene tube of 13 mm in length and 15 mm in diameter down to the bottom of the cuvette in whose axis the sample is mounted. The application of the said technique can increase the quality factor by an order of magnitude when Czechoslovak-made cuvettes are used and a significantly higher value of quality factor can be obtained than when peak standard cuvettes imported from abroad and the original Huelsen and Prenzel's procedure are used. (B.S.)

  6. La nueva ciencia

    Directory of Open Access Journals (Sweden)

    Ramón Gavela González

    2011-01-01

    Full Text Available Los nuevos desarrollos informáticos, tanto en supercomputación como en informática distribuida, están propiciando una nueva for - ma más globalizada, integrada y pluridisciplinar de hacer ciencia. Las tecnologías de informática distribuida (GRID, que han sur - gido para resolver el monumental problema de tratamiento de datos de los grandes experimentos de física de partículas (LHC del CERN, están propiciando su aplicación en otros campos de la ciencia, en los que se necesita, cada vez más, gestionar grandes cantidades de información y acometer modelizaciones complejas con nuevas arquitecturas. Las redes GRID de los continentes se están organizando para abordar los retos cientíęcos del futuro, en relación con el dominio de los sistemas complejos e interactivos, la salud a través de la biotecnología, el modelo de universo, la nanociencia y las ciencias ambientales en la gestión del cambio climático. Así mismo, se está preparando la conjunción de todas las redes continentales en la red mundial, como lo son los proyectos EELA, EELA2 y GISELA, en Latinoamérica. Este tren de la nueva ciencia no debe perderse, pues de él depende el bienestar del futuro.

  7. Adolescente y nuevas adicciones

    OpenAIRE

    Hernanz Ruiz, Manuel

    2015-01-01

    El autor reflexiona sobre la adolescencia como momento evolutivo en el que se puede entender la adicción como un modo de relación en la que éste busca resolver situaciones o estados conflictivos de manera poco adecuada. Se plantea cuáles son los factores que pueden influir en la utilización abusiva de las nuevas tecnologías, los problemas derivados de su clasificación y los aspectos propios de la personalidad así como de los mecanismos que deben de ser contemplados tanto para su abordaje como...

  8. Magnitude estimate of occupational risks located in a radiative facility and its main health impacts; Estimativa da magnitude de riscos ocupacionais presentes em uma instalacao radiativa e seus principais impactos a saude

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Alice dos Santos; Gerulis, Eduardo; Carneiro, Janete C.G.G., E-mail: alicesante@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2014-07-01

    The work routine of Radiopharmacy Center (CR) personnel of the Institute of Energy Research and Nuclear (IPEN / CNEN-SP) includes singularities not exist in other professions. Relevant examples to this study can be cited: exposure to physical, chemical, biological hazards, to accidents and ergonomic risks. The objective of this study is to conduct a quantitative and qualitative evaluation of occupational exposure existing in the workplace and its impact on the health of occupationally exposed individuals (IOE's). The proposed methodology was based on systematic observation and a questionnaire to the managers of each practice held at CR. The evaluation process involved three steps: a) characterization of exposure; b) identification of the main points of exposure and possible routes of exposure; c) quantifying of exposure. Seventeen occupational agents related to the tasks of different groups of IOE's were identified. Ionizing radiation (physical risk) and the situations that cause stress (ergonomic risk) had the highest frequencies. According to the applied methodology risks was considered mostly acceptable. Quantification of exposure was basically referring to physical risk agent (Ionizing radiation), because it is a radioactive installation. Based on the records analyzed, not was observed health risks to workers arising from the activities undertaken.

  9. Las nuevas formas de racismo

    OpenAIRE

    Gutiérrez López-Dóriga, Cristina

    2012-01-01

    El racismo tal y como lo conocíamos ha disminuido considerablemente ya que ha debido adaptarse a las nuevas exigencias sociales. Esta adaptación ha creado una nueva forma de expresión de este fenómeno, más larvada pero igual de dañina que las anteriores formas manifiestas. Y aunque las bases que sustentan esta nueva forma de racismo dependen de la historia cultural del lugar, siendo así diferentes en Europa y Estados Unidos, ambas aluden a los mismos procesos que crean y mantienen la desigual...

  10. Therapy with {sup 90}Y microspheres: radiation protection in new medical therapies; Terapia con microesferas de {sup 90}Y: proteccion radiologica en nuevas terapias medicas

    Energy Technology Data Exchange (ETDEWEB)

    Rojo, Ana; Puerta, Nancy, E-mail: arojo@arn.gob.ar [Autoridad Regulatoria Nuclear (ARN), Buenos Aires (Argentina)

    2013-07-01

    Primary liver cancer is one of the most frequent in the world and with a low cure rate. Radioembolization using 90y spheres is a promising treatment of this pathology and involves the percutaneous vascular application of radioisotope-labeled the order of Micron size particles. The advantages of this technique include the permit administered high doses of radiation to small volumes with low relative toxicity, offer the possibility of treating all the liver including microscopic tumors, and finally, the feasibility of combined with other therapies. Radiation protection in new medical therapies requires justification and optimization, as requirements for their implementation. The application of the principle of optimization in the context of the protection of the patient must be the minimum that it can be reasonably reached compatible with the required doses of treatment dose to healthy tissue. With {sup 90}Y microspheres therapy this optimization applies to the activity of 90y which is administered to the patient, and estimation methods are postulated. in this work are analyzed comparatively these methods, described the early physicists, equations and the limitations of each. Finally, it is concluded that the optimal method to be implemented for the evaluation of the activity of {sup 90}Y manage must be based in a voxel dosimetric model specific for each patient, however, the partitional method may be a good alternative if you don't have the tools to apply the method.

  11. Evaluation of the ICRU operational magnitudes implantation for the photon radiation at the Angra I and Angra II nuclear power plants

    International Nuclear Information System (INIS)

    Viana, Ronaldo do Nascimento

    2006-01-01

    The measurements of photon radiation field intensity are usually performed by a radiation protection technician trained and having skill in using radiation rate meters. Nowadays, these measurements are reported on exposure quantity and used to protect exposed individuals against the radiation risks while executing their activities. The International Commission on Radiation Units and Measurements - ICRU - defined the operational quantity ambient equivalent dose H * (10). This quantity is accepted by the scientific community as the best estimative of the protection quantity effective dose, which can not be directly measured. The operational quantity H * (10) was introduced in Brazilian rules by the National Commission of Nuclear Energy - CNEN (2005a), although its adoption was conditioned to studies of convenience and applicability of implementation. The present work may contribute to these studies, as it presents the evaluation of H * (10)'s implementation at the Nuclear Central Almirante Alvaro Alberto - CNAAA. The evaluation involved radiological tests - the energy dependence and angular dependence - applied to six types of photon radiation rate meters utilized at the CNAAA, with represent around 83% of the total number of rate meters in use by CNAAA. The result of this evaluation is favorable to the quantity H * (10)'s implementation. Suggestions are presented in order to update de rate meters and the technical and administrative procedures related to the Laboratory of Calibration of Rate Meters - LCMR, belonging to CNAAA. Thus, it could be possible to perform the calibration of the rate meters at the nuclear installation. The results obtained allows to carry out new evaluations of H * (10)'s implementation on installations that perform measurements with radiation rate meters on the practice of radiation protection, in order to adopt the H * (10) quantity in our country. (author)

  12. Teleseismic magnitude relations

    Directory of Open Access Journals (Sweden)

    Markus Båth

    2010-02-01

    Full Text Available Using available sets of magnitude determinations, primarily from Uppsala seismological bulletin, various extensions are made of the Zurich magnitude recommendations of 1967. Thus, body-wave magnitude (m and surface-wave magnitudes (M are related to each other for 12 different earthquake regions as well as world-wide. Depth corrections for M are derived for all focal depths. Formulas are developed which permit calculation of M also from vertical component long-period seismographs. Body-wave magnitudes from broad-band and narrow-band short-period seismographs are compared and relations deduced. Applications are made both to underground nuclear explosions and to earthquakes. The possibilities of explosion-earthquake discrimination on the basis of magnitudes are examined, as well as the determination of explosive yield from magnitudes. For earthquakes, relations between magnitudes of main earthquakes and largest aftershocks are investigated. A world-wide station network for more homogeneous magnitude determinations is suggested in order to provide the necessary reference system.

  13. The magnitude and relevance of the February 2014 radiation release from the Waste Isolation Pilot Plant repository in New Mexico, USA

    Energy Technology Data Exchange (ETDEWEB)

    Thakur, P. [Carlsbad Environmental Monitoring & Research Center, 1400 University Drive, Carlsbad, NM, 88220 (United States); Lemons, B.G.; White, C.R. [AECOM, Carlsbad Operations, Carlsbad, NM, 88220 (United States)

    2016-09-15

    After almost fifteen years of successful waste disposal operations, the first unambiguous airborne radiation release from the Waste Isolation Pilot Plant (WIPP) was detected beyond the site boundary on February 14, 2014. It was the first accident of its kind in the 15-year operating history of the WIPP. The accident released moderate levels of radioactivity into the underground air. A small but measurable amount of radioactivity also escaped to the surface through the ventilation system and was detected above ground. The dominant radionuclides released were americium and plutonium, in a ratio consistent with the known content of a breached drum. The radiation release was caused by a runaway chemical reaction inside a transuranic (TRU) waste drum which experienced a seal and lid failure, spewing radioactive materials into the repository. According to source-term estimation, approximately 2 to 10 Ci of radioactivity was released from the breached drum into the underground, and an undetermined fraction of that source term became airborne, setting off an alarm and triggering the closure of seals designed to force exhausting air through a system of filters including high-efficiency-particulate-air (HEPA) filters. Air monitoring across the WIPP site intensified following the first reports of radiation detection underground to determine the extent of impact to WIPP personnel, the public, and the environment, if any. This article attempts to compile and interpret analytical data collected by an independent monitoring program conducted by the Carlsbad Environmental Monitoring & Research Center (CEMRC) and by a compliance-monitoring program conducted by the WIPP's management and operating contractor, the Nuclear Waste Partnership (NWP), LLC., in response to the accident. Both the independent and the WIPP monitoring efforts concluded that the levels detected were very low and localized, and no radiation-related health effects among local workers or the public would be

  14. Moment magnitude scale

    Energy Technology Data Exchange (ETDEWEB)

    Hanks, T.C.; Kanamori, H.

    1979-05-10

    The nearly conincident forms of the relations between seismic moment M/sub o/ and the magnitudes M/sub L/, M/sub s/, and M/sub w/ imply a moment magnitude scale M=2/3 log M/sub o/-10.7 which is uniformly valid for 3< or approx. =M/sub L/< or approx. = 7, 5 < or approx. =M/sub s/< or approx. =7 1/2 and M/sub w/> or approx. = 7 1/2.

  15. The moment magnitude Mw and the energy magnitude Me: common roots and differences

    OpenAIRE

    2010-01-01

    Abstract Starting from the classical empirical magnitude-energy relationships, in this article, the derivation of the modern scales for moment magnitude Mw and energy magnitude Me is outlined and critically discussed. The formulas for Mw and Me calculation are presented in a way that reveals, besides the contributions of the physically defined measurement parameters seismic moment M0 and radiated seismic energy ES, the role of the constants in the classical Gutenberg?Richter magnit...

  16. Una nueva forma de conflicto

    Directory of Open Access Journals (Sweden)

    SALUSTIANO DEL CAMPO

    2002-01-01

    Full Text Available Con el ataque del 11 de septiembre al World Trade Center, el siglo XXI ha empezado con una nueva forma de conflicto y un realineamiento global. Samuel P. Huntington (1993 describió esto como un choque de civilizaciones entre el islam y occidente, pero se argumenta que esto es una simplificación. Otros factores a tener en cuenta son la coexistencia de las sociedades modernas y postmodernas, la desigual distribución de la riqueza, los conflictos internacionales insolubles de larga duración y la condición del islam en diferentes países. Se discute el impacto de la futura diseminación de la tecnología de la información en la resolución de algunas de estas diferencias. Recientemente se han desmantelado anteriores redes internacionales e instituciones. Coexisten redes legales e ilegales de negocios y organizaciones. En el caso de las redes terroristas, es muy complicado identifcarlas, atacarlas y desactivarlas. En el proceso de combatir al terrorismo no deberían sacrificarse los derechos fundamentales democráticos.

  17. hoteleras del Estado Nueva Esparta

    Directory of Open Access Journals (Sweden)

    Daisis Giménez Sifontes

    2015-01-01

    Full Text Available Las empresas hoteleras deben contar con modelos de costos para obtener información relevante en el proceso de toma de decisiones gerenciales; sin embargo, a través de estudio previo, aplicando un análisis univariante se determinó que las empresas hoteleras categorizadas del Estado Nueva Esparta se basan en un modelo inorgánico de costos. En este contexto, la presente investigación tuvo como objetivo determinar los factores que influyen en ese modelo para su proceso de toma de decisiones, para ello se realizó un diseño de campo y aplicó un análisis factorial exploratorio con el método de extracción de factores análisis de componentes principales concluyendo que entre los factores que lo explican se encuentran, el no manejar herramientas como: margen de contribución, costos estándares, margen de seguridad, apalancamiento operativo, contabilidad por área de responsabilidad, aspectos motivacionales y congruencias de metas.

  18. Nueva escuela en Weggis, Suiza

    Directory of Open Access Journals (Sweden)

    Dahinden, J.

    1968-10-01

    Full Text Available This school has 5 standard schoolrooms, special teaching rooms, recreation hall, and a gymnasium, which can also be devoted to a variety of other uses. The lighting, both by day and by night, has been the subject of careful planning in this design, as well as the optimum orientation of the different rooms, in order to obtain a spontaneously friendly and pleasant environment, which will favourably influence the outlook of the young students.El conjunto construido contiene: 5 clases normales, las especiales, sala de recreo, etc.; y el gimnasio, que puede ser utilizado también como sala para múltiples usos. En esta nueva Escuela ha sido cuidadosamente estudiado el alumbrado, tanto diurno como nocturno, la orientación óptima de los diversos locales, y la elección de los materiales, con objeto de conseguir un ambiente alegre y «natural», que pueda influir favorablemente en la formación de los alumnos.

  19. Solar Variability Magnitudes and Timescales

    Science.gov (United States)

    Kopp, Greg

    2015-08-01

    The Sun’s net radiative output varies on timescales of minutes to many millennia. The former are directly observed as part of the on-going 37-year long total solar irradiance climate data record, while the latter are inferred from solar proxy and stellar evolution models. Since the Sun provides nearly all the energy driving the Earth’s climate system, changes in the sunlight reaching our planet can have - and have had - significant impacts on life and civilizations.Total solar irradiance has been measured from space since 1978 by a series of overlapping instruments. These have shown changes in the spatially- and spectrally-integrated radiant energy at the top of the Earth’s atmosphere from timescales as short as minutes to as long as a solar cycle. The Sun’s ~0.01% variations over a few minutes are caused by the superposition of convection and oscillations, and even occasionally by a large flare. Over days to weeks, changing surface activity affects solar brightness at the ~0.1% level. The 11-year solar cycle has comparable irradiance variations with peaks near solar maxima.Secular variations are harder to discern, being limited by instrument stability and the relatively short duration of the space-borne record. Proxy models of the Sun based on cosmogenic isotope records and inferred from Earth climate signatures indicate solar brightness changes over decades to millennia, although the magnitude of these variations depends on many assumptions. Stellar evolution affects yet longer timescales and is responsible for the greatest solar variabilities.In this talk I will summarize the Sun’s variability magnitudes over different temporal ranges, showing examples relevant for climate studies as well as detections of exo-solar planets transiting Sun-like stars.

  20. Historical revision of the exposure magnitude and the dosimetric magnitudes used in radiological protection; Revision historica de la magnitud exposicion y las magnitudes dosimetricas empleadas en proteccion radiologica

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez J, F. [UNAM, Facultad de Ciencias, Ciudad Universitaria, 04510 Mexico D. F. (Mexico); Alvarez R, J. T., E-mail: trinidad.alvarez@inin.gob.mx [ININ, Departamento de Metrologia de Radiaciones Ionizantes, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    In this work a historical revision of the exposure magnitude development and their roentgen unit (1905 - 2011) is made, noting that it had their origin in the electric methods for the detection of the ionizing radiation in the period of 1895 at 1937. However, the ionization is not who better characterizes the physical, chemical and biological effects of the ionizing radiations, but is the energy deposited by this radiation in the interest bodies, which led historically to the development of dosimetric magnitudes in energy terms like they are: the absorbed dose D (1950), the kerma K (1958) and the equivalent dose H (1962). These dosimetric magnitudes culminated with the definition of the effective equivalent dose or effective dose which is not measurable and should be considered with the operative magnitudes ICRU: H environmental equivalent dose and/or H directional equivalent dose, which can be determined by means of a conversion coefficient that is applied to the exposure, kerma in air, fluence, etc. (Author)

  1. Right idea, wrong magnitude system.

    Science.gov (United States)

    Lourenco, Stella F; Aulet, Lauren S; Ayzenberg, Vladislav; Cheung, Chi-Ngai; Holmes, Kevin J

    2017-01-01

    Leibovich et al. claim that number representations are non-existent early in life and that the associations between number and continuous magnitudes reside in stimulus confounds. We challenge both claims - positing, instead, that number is represented independently of continuous magnitudes already in infancy, but is nonetheless more deeply connected to other magnitudes through adulthood than acknowledged by the "sense of magnitude" theory.

  2. Nueva Sede para la Academia

    Directory of Open Access Journals (Sweden)

    Mario Camacho Pinto

    1994-06-01

    Full Text Available

    Una nueva sede adecuadamente dotada siempre estuvo en la mente de nuestros expresidentes Académicos César Augusto Pantoja, Hernando Groot, Pablo Gómez Martínez, Jorge Cavelier Gaviria y Efraim Otero-Ruiz, con quienes me tocó en suerte trabajar 12 años consecutivos, cerca de ellos a través de mi cargo de Coordinardor de la Comisión Permanente de Biblioteca y Publicaciones y de la Revista MEDICINA que se ha venido publicando sin interrupciones dentro de un compañerismo ejemplar; además de otras distinciones operativas que me inducen a expresar gratitud.

    Ahora, además, como Secretario de la Coporación por elección unánime de la Asamblea hace dos años, he sido testigo ático de una intensa, inteligente e inagotable actividad que nuestro Presidente Académico Juan Jacobo Muñoz Delgado quien siempre con el visto bueno de la Junta Directiva, mediante un acelerado ritmo de trabajo se impuso la tarea de convertir en realidad inmediata tan anhelada y necesaria idea.

    En efecto, la nueva sede fue inaugurada oficialmente el día 2 de septiembre de 1993.

    Este Editorial es la constancia escrita de tal febril actividad que para proporcionar evidencia a los lectores de “MEDICINA” resumo en breves incisos que muestran el tránsito a un estado con superávit de excepción para esta clase de instituciones:

    1. Terminación de la obra ya iniciada de la remodelación arquitectónica, tanto exterior de seguridad y aspecto como interior con suficientes y modernas instalaciones.

    2. Cerramiento total con altas y elegantes rejas metálicas y doble portería por la calle 69 y la carrera 7a.

    3. Aparcadero lujosamente adoquinado, amplio y seguro para 30 automóviles.

    4. Decoración interior estéticamente consultada, bien lograda en cortinas y clásicas lámparas de cristal obsequiadas por conocidos académicos. Un par de originales urnas precolombianas en el hall de entrada.

    5. Zona social doble, amplia

  3. Moment Magnitude discussion in Austria

    Science.gov (United States)

    Weginger, Stefan; Jia, Yan; Hausmann, Helmut; Lenhardt, Wolfgang

    2017-04-01

    We implemented and tested the Moment Magnitude estimation „dbmw" from the University of Trieste in our Antelope near real-time System. It is used to get a fast Moment Magnitude solutions and Ground Motion Parameter (PGA, PGV, PSA 0.3, PSA 1.0 and PSA 3.0) to calculate Shake and Interactive maps. A Moment Magnitude Catalogue was generated and compared with the Austrian Earthquake Catalogue and all available Magnitude solution of the neighbouring agencies. Relations of Mw to Ml and Ground Motion to Intensity are presented.

  4. Integrated Circuit Stellar Magnitude Simulator

    Science.gov (United States)

    Blackburn, James A.

    1978-01-01

    Describes an electronic circuit which can be used to demonstrate the stellar magnitude scale. Six rectangular light-emitting diodes with independently adjustable duty cycles represent stars of magnitudes 1 through 6. Experimentally verifies the logarithmic response of the eye. (Author/GA)

  5. Lago Agrio (Nueva Loja), Ecuador: A Strategic Black Spot?

    Science.gov (United States)

    2013-03-01

    Lago Agrio (Nueva Loja ), Ecuador : A Strategic Black Spot? by Colonel John A. Conway United States Army...REPORT TYPE STRATEGY RESEARCH PROJECT .33 3. DATES COVERED (From - To) 4. TITLE AND SUBTITLE Lago Agrio (Nueva Loja ), Ecuador : A...Agrio (Nueva Loja ), Ecuador : A Strategic Black Spot? by Colonel John A. Conway United States Army Colonel Juan C

  6. Historical revision of the exposure magnitude and the dosimetric magnitudes used in radiological protection

    International Nuclear Information System (INIS)

    Gonzalez J, F.; Alvarez R, J. T.

    2014-10-01

    In this work a historical revision of the exposure magnitude development and their roentgen unit (1905 - 2011) is made, noting that it had their origin in the electric methods for the detection of the ionizing radiation in the period of 1895 at 1937. However, the ionization is not who better characterizes the physical, chemical and biological effects of the ionizing radiations, but is the energy deposited by this radiation in the interest bodies, which led historically to the development of dosimetric magnitudes in energy terms like they are: the absorbed dose D (1950), the kerma K (1958) and the equivalent dose H (1962). These dosimetric magnitudes culminated with the definition of the effective equivalent dose or effective dose which is not measurable and should be considered with the operative magnitudes ICRU: H environmental equivalent dose and/or H directional equivalent dose, which can be determined by means of a conversion coefficient that is applied to the exposure, kerma in air, fluence, etc. (Author)

  7. Scaling relations of moment magnitude, local magnitude, and duration magnitude for earthquakes originated in northeast India

    Science.gov (United States)

    Bora, Dipok K.

    2016-06-01

    In this study, we aim to improve the scaling between the moment magnitude ( M W), local magnitude ( M L), and the duration magnitude ( M D) for 162 earthquakes in Shillong-Mikir plateau and its adjoining region of northeast India by extending the M W estimates to lower magnitude earthquakes using spectral analysis of P-waves from vertical component seismograms. The M W- M L and M W- M D relationships are determined by linear regression analysis. It is found that, M W values can be considered consistent with M L and M D, within 0.1 and 0.2 magnitude units respectively, in 90 % of the cases. The scaling relationships investigated comply well with similar relationships in other regions in the world and in other seismogenic areas in the northeast India region.

  8. Scaling Relations of Local Magnitude versus Moment Magnitude for Sequences of Similar Earthquakes in Switzerland

    KAUST Repository

    Bethmann, F.

    2011-03-22

    Theoretical considerations and empirical regressions show that, in the magnitude range between 3 and 5, local magnitude, ML, and moment magnitude, Mw, scale 1:1. Previous studies suggest that for smaller magnitudes this 1:1 scaling breaks down. However, the scatter between ML and Mw at small magnitudes is usually large and the resulting scaling relations are therefore uncertain. In an attempt to reduce these uncertainties, we first analyze the ML versus Mw relation based on 195 events, induced by the stimulation of a geothermal reservoir below the city of Basel, Switzerland. Values of ML range from 0.7 to 3.4. From these data we derive a scaling of ML ~ 1:5Mw over the given magnitude range. We then compare peak Wood-Anderson amplitudes to the low-frequency plateau of the displacement spectra for six sequences of similar earthquakes in Switzerland in the range of 0:5 ≤ ML ≤ 4:1. Because effects due to the radiation pattern and to the propagation path between source and receiver are nearly identical at a particular station for all events in a given sequence, the scatter in the data is substantially reduced. Again we obtain a scaling equivalent to ML ~ 1:5Mw. Based on simulations using synthetic source time functions for different magnitudes and Q values estimated from spectral ratios between downhole and surface recordings, we conclude that the observed scaling can be explained by attenuation and scattering along the path. Other effects that could explain the observed magnitude scaling, such as a possible systematic increase of stress drop or rupture velocity with moment magnitude, are masked by attenuation along the path.

  9. EOP Current Magnitude and Direction

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data contain shipboard current magnitudes and directions collected in the Pacific, both pelagic and near shore environments. Data is collected using an RD...

  10. Magnitude conversion to unified moment magnitude using orthogonal regression relation

    Science.gov (United States)

    Das, Ranjit; Wason, H. R.; Sharma, M. L.

    2012-05-01

    Homogenization of earthquake catalog being a pre-requisite for seismic hazard assessment requires region based magnitude conversion relationships. Linear Standard Regression (SR) relations fail when both the magnitudes have measurement errors. To accomplish homogenization, techniques like Orthogonal Standard Regression (OSR) are thus used. In this paper a technique is proposed for using such OSR for preparation of homogenized earthquake catalog in moment magnitude Mw. For derivation of orthogonal regression relation between mb and Mw, a data set consisting of 171 events with observed body wave magnitudes (mb,obs) and moment magnitude (Mw,obs) values has been taken from ISC and GCMT databases for Northeast India and adjoining region for the period 1978-2006. Firstly, an OSR relation given below has been developed using mb,obs and Mw,obs values corresponding to 150 events from this data set. M=1.3(±0.004)m-1.4(±0.130), where mb,proxy are body wave magnitude values of the points on the OSR line given by the orthogonality criterion, for observed (mb,obs, Mw,obs) points. A linear relation is then developed between these 150 mb,obs values and corresponding mb,proxy values given by the OSR line using orthogonality criterion. The relation obtained is m=0.878(±0.03)m+0.653(±0.15). The accuracy of the above procedure has been checked with the rest of the data i.e., 21 events values. The improvement in the correlation coefficient value between mb,obs and Mw estimated using the proposed procedure compared to the correlation coefficient value between mb,obs and Mw,obs shows the advantage of OSR relationship for homogenization. The OSR procedure developed in this study can be used to homogenize any catalog containing various magnitudes (e.g., ML, mb, MS) with measurement errors, by their conversion to unified moment magnitude Mw. The proposed procedure also remains valid in case the magnitudes have measurement errors of different orders, i.e. the error variance ratio is

  11. Radiation

    International Nuclear Information System (INIS)

    2013-01-01

    The chapter one presents the composition of matter and atomic theory; matter structure; transitions; origin of radiation; radioactivity; nuclear radiation; interactions in decay processes; radiation produced by the interaction of radiation with matter

  12. La nueva ingeniería

    Directory of Open Access Journals (Sweden)

    Carlos Cortés Amador

    1993-01-01

    Full Text Available En el presente artículo, inicialmente se recalcan algunos de los campos de aplicción general de la Ingeniería de Sistemas. También se enfatiza acerca de la actual era de la ingeniería, que ha conducido a nuevas matrices disciplinarias. Sin duda, la biología, como ciencia, y sus diferentes aplicaciones, han dado lugar a la "onda biotecnológica': que plantea. nuevas alternativas y consideraciones teóricas a la Ingeniería. Por esta razón se hace referencia breve a dicha temátIca en este artículo, como parte de una evaluación de una experiencia investigativa en el Instituto de Biotecnología. Finalmente se presentan algunas conclusiones provisionales que esperamos sean un aporte para la discusión sobre los temas tratados en este ensayo.

  13. Nueva estela procedente de Libia (La Rioja

    Directory of Open Access Journals (Sweden)

    Beltrán Lloris, Francisco

    2005-12-01

    Full Text Available Note on a decorated stela from the so called 'Herramélluri workshop' (La Rioja in Libia bearing a Latin inscription with a Celtic name (Gustuna not attested until now.Nota sobre una nueva inscripción latina realizada sobre una estela decorada del llamado "taller de Herramélluri" (La Rioja, la antigua Libia, con un nombre céltico no atestiguado hasta ahora: Gustuna.

  14. "Orobanche ballotae" A. Pujadas ("Oronbanchaceae"), especie nueva

    OpenAIRE

    Pujadas Salvá, Antonio J.

    1997-01-01

    Orobanche ballotae A. Pujadas (Orobanchaceae), especie. Se describe para el S de la Península Ibérica una especie nueva del género Orobanche L., de la sección Orobanche, Grex Minores G. Beck. Se destacan sus caracteres morfológicos que permiten diferenciarlo claramente de O. minor Sm., especie con la que presenta ciertas semejanzas.

  15. Absolute magnitudes by statistical parallaxes

    International Nuclear Information System (INIS)

    Heck, A.

    1978-01-01

    The author describes an algorithm for stellar luminosity calibrations (based on the principle of maximum likelihood) which allows the calibration of relations of the type: Msub(i)=sup(N)sub(j=1)Σqsub(j)Csub(ij), i=1,...,n, where n is the size of the sample at hand, Msub(i) are the individual absolute magnitudes, Csub(ij) are observational quantities (j=1,...,N), and qsub(j) are the coefficients to be determined. If one puts N=1 and Csub(iN)=1, one has q 1 =M(mean), the mean absolute magnitude of the sample. As additional output, the algorithm provides one also with the dispersion in magnitude of the sample sigmasub(M), the mean solar motion (U,V,W) and the corresponding velocity ellipsoid (sigmasub(u), sigmasub(v), sigmasub(w). The use of this algorithm is illustrated. (Auth.)

  16. Understanding Magnitudes to Understand Fractions

    Science.gov (United States)

    Gabriel, Florence

    2016-01-01

    Fractions are known to be difficult to learn and difficult to teach, yet they are vital for students to have access to further mathematical concepts. This article uses evidence to support teachers employing teaching methods that focus on the conceptual understanding of the magnitude of fractions.

  17. The language of magnitude comparison

    OpenAIRE

    Matthews, William John; Dylman, Alexandra S

    2014-01-01

    When two objects differ in magnitude, their relation can be described with a "smaller" comparative (e.g., "less", "shorter", "lower") or a "larger" comparative (e.g., "more", "taller", "higher"). We show that, across multiple dimensions and tasks, English speakers preferentially use the latter. In sentence-completion tasks, this higher use of larger comparatives (HULC) effect is more pronounced when the larger item is presented on the left (for simultaneous presentation) or second (for sequen...

  18. Creativos, Precarios, y Nuevas Formas de Interculturalidad

    Directory of Open Access Journals (Sweden)

    Néstor García Canclini

    2016-05-01

    Full Text Available Quiero proponer explorar la fertilidad de un enfoque antropológico queconsiste en mirar como conversaciones los signos de lo que cuesta entender en elmundo contemporáneo. Con ese fin voy a contarles dos investigaciones en las quebuscamos cambiar algunas preguntas habituales sobre los comportamientos de losjóvenes creativos y sobre lo que hacemos hoy en las nuevas formas de leer, en papel y en pantallas. Ambos estudios surgieron del descontento con las fotos y los relatos que nos daban la sociología y la economía acerca de los jóvenes y la lectura.

  19. Nuevas formas organizacionales en la gobernabilidad transnacional

    OpenAIRE

    Vargas Hernández, José Gpe.

    2008-01-01

    El objetivo de este trabajo es analizar las transformaciones que están teniendo las formas organizacionales para adaptarse a los requerimientos de una gobernabilidad transnacional que de respuesta a los cambios del medio ambiente creado por los procesos de globalización económica. A partir de un análisis de los elementos sobresalientes de las estructuras en las organizaciones, se determinan las tendencias en las nuevas formas organizacionales considerando las variables de un medio ambiente ca...

  20. Marketing Experiencial: Una nueva tendencia del marketing

    OpenAIRE

    Magro Magdalena, Lara

    2013-01-01

    El reciente desarrollo de las tecnologías y su cada vez mayor implicación en la vida diaria de las personas, ha permitido en el mundo del marketing, la creación de nuevos modelos de negocio y promociones que buscan cautivar, interesar y sorprender, siempre de forma innovadora y distintiva a los usuarios finales. Durante todo el trabajo presentado a continuación, se va a explicar una nueva forma de marketing que está creando moda entre las firmas más prestigiosas, como pueden ser A...

  1. Nueva prospectiva para la paz de Colombia

    Directory of Open Access Journals (Sweden)

    Alejo Vargas Velásquez

    2003-01-01

    Full Text Available Este trabajo se propone explicar la evolucion y las causas de la violencia en Colombia, la cual tiene en el conflicto armado una forma de expresión. Sobre este se analizan los factores que han permitido la permanencia del movimiento guerrillero en el país, a lo largo de cuatro décadas, antes y después de la guerra fría. Asimismo, se exploran los factores que incidieron en la ruptura del proceso de paz, entre el gobierno nacional del presidente Andrés Pastrana y las Farc. Finalmente, se reflexiona sobre las posibilidades de una nueva negociación con las guerrillas bajo el mandato del presidente Uribe y sobre las dificultades históricas comunes a los procesos de paz en el país, eventos en los cuales ha prevalecido una falta de coordinación entre los funcionarios civiles y militares.

  2. The moment magnitude M w and the energy magnitude M e: common roots and differences

    Science.gov (United States)

    Bormann, Peter; di Giacomo, Domenico

    2011-04-01

    Starting from the classical empirical magnitude-energy relationships, in this article, the derivation of the modern scales for moment magnitude M w and energy magnitude M e is outlined and critically discussed. The formulas for M w and M e calculation are presented in a way that reveals, besides the contributions of the physically defined measurement parameters seismic moment M 0 and radiated seismic energy E S, the role of the constants in the classical Gutenberg-Richter magnitude-energy relationship. Further, it is shown that M w and M e are linked via the parameter Θ = log( E S/ M 0), and the formula for M e can be written as M e = M w + (Θ + 4.7)/1.5. This relationship directly links M e with M w via their common scaling to classical magnitudes and, at the same time, highlights the reason why M w and M e can significantly differ. In fact, Θ is assumed to be constant when calculating M w. However, variations over three to four orders of magnitude in stress drop Δ σ (as well as related variations in rupture velocity V R and seismic wave radiation efficiency η R) are responsible for the large variability of actual Θ values of earthquakes. As a result, for the same earthquake, M e may sometimes differ by more than one magnitude unit from M w. Such a difference is highly relevant when assessing the actual damage potential associated with a given earthquake, because it expresses rather different static and dynamic source properties. While M w is most appropriate for estimating the earthquake size (i.e., the product of rupture area times average displacement) and thus the potential tsunami hazard posed by strong and great earthquakes in marine environs, M e is more suitable than M w for assessing the potential hazard of damage due to strong ground shaking, i.e., the earthquake strength. Therefore, whenever possible, these two magnitudes should be both independently determined and jointly considered. Usually, only M w is taken as a unified magnitude in many

  3. Scaling Relations of Local Magnitude versus Moment Magnitude for Sequences of Similar Earthquakes in Switzerland

    KAUST Repository

    Bethmann, F.; Deichmann, N.; Mai, Paul Martin

    2011-01-01

    Theoretical considerations and empirical regressions show that, in the magnitude range between 3 and 5, local magnitude, ML, and moment magnitude, Mw, scale 1:1. Previous studies suggest that for smaller magnitudes this 1:1 scaling breaks down

  4. Nuevas formas organizacionales en la gobernabilidad transnacional

    Directory of Open Access Journals (Sweden)

    José Gpe. Vargas Hernández

    Full Text Available El objetivo de este trabajo es analizar las transformaciones que están teniendo las formas organizacionales para adaptarse a los requerimientos de una gobernabilidad transnacional que de respuesta a los cambios del medio ambiente creado por los procesos de globalización económica. A partir de un análisis de los elementos sobresalientes de las estructuras en las organizaciones, se determinan las tendencias en las nuevas formas organizacionales considerando las variables de un medio ambiente caracterizado por altos niveles de absorción de incertidumbre, complejidad de sistemas involucrados, flexibilidad de estructuras, comportamientos y procesos, interdependencia e interacciones de agentes económicos y actores políticos y sociales, incremento de la velocidad, cambios de poder y desmembramiento de fenómenos organizacionales. Finalmente, se hace una elaboración de las implicaciones del diseño organizacional e institucional bajo los diferentes modelos desde los enfoques del neoliberalismo, el intergubernamentalismo y las redes de gestión. A partir de este análisis se concluye con una delimitación de los principales retos.

  5. Inmigrantes y nuevas tecnologías

    Directory of Open Access Journals (Sweden)

    Juvenal García

    2012-04-01

    Full Text Available Son muy numerosos los estudios que tratan de diagnosticar y caracterizar los modos de estar de las personas inmigrantes en España. En especial, se pueden consultar numerosos estudios acerca de sus pautas de consumo comunicativo-tecnológicas. No obstante, todos estos estudios son de carácter cuantitativo. Los estudios cualitativos apenas son conocidos por estar dentro de las prácticas de las empresas privadas, que buscan un nuevo y potente nicho de mercado. Nuestro equipo ha decidido reunir aquí a grandes rasgos un perfil de uso, percepción y valoración de los soportes tecnológicos y de los new media, a partir de lo que sabemos por otros estudios no dedicados específicamente al tema, así como indicar las pautas que prevemos para un futuro estudio de carácter cualitativo para ofrecer un relato con contenido de la relación entre la población inmigrante y las Nuevas Tecnologías.

  6. El trabajo en la pepena informal en México: nuevas realidades, nuevas desigualdades

    OpenAIRE

    José Juan Cervantes Niño; Lylia Palacios Hernández

    2012-01-01

    Generalmente se afirma que las actividades de la pepena informal son algunas de las peores formas de empleo en México. Sin embargo, con base en la información de un estudio nacional y mediante una metodología de evaluación rápida, en este texto se destaca que muchas de las características típicas de dichas actividades han mutado y que en la actualidad se pueden encontrar nuevas realidades de esas ocupaciones, las cuales conllevan diferentes desigualdades, pero pueden inducir a una mejor formu...

  7. Creación de nuevas empresas. Estrategias personales para buscar nuevas oportunidades de negocios

    Directory of Open Access Journals (Sweden)

    Jorge Luis Vengoechea Orozco

    2009-01-01

    Full Text Available Resumen:Generar ideas de negocios es un gran reto hay que empezar por gestar ideas, pensar creativamente y comenzarpor generar una lista de ideas, sin preocuparse en como se materializar la idea. Al formular las ideas se debenaceptar todo tipo de ideas, ya sean tontas o atrevidas, ideas que vayan en contra de lo que la gente piensa. Unaforma de hacerlo es contactar familiares y personas de confianza para compartir las ideas, esta es una buenamanera de deshacerse de las malas ideas y de encontrar nuevas oportunidades de negocios, al contactar amigosy personas allegadas se puede saber qué opinan de las ideas y que nuevas ideas o mejoras podrían sugerir ellos.Palabras claves:Ideas, negocios, emprendimiento, emprendedor.Abstract:Generate business ideas is a challenge we must begin by developing ideas, think creatively and begin to generatea list of ideas, without worrying as to materialize the idea. In formulating the ideas must accept all kinds of ideas,whether silly or daring ideas that go against what people think. One way is to contact family and people you trust toshare ideas, this is a good way to get rid of bad ideas and find new business opportunities, to contact friends andsignificant others can know what you think of the ideas and new ideas or improvements that might suggest them.Keywords:Ideas, business, entrepreneurship, entrepreneurial

  8. Radiations

    International Nuclear Information System (INIS)

    Pujol Mora, J.

    1999-01-01

    The exposition to ionizing radiations is a constant fact in the life of the human being and its utilization as diagnostic and therapeutic method is generalized. However, it is notorious how as years go on, the fear to the ionizing radiation seems to persist too, and this fact is not limited to the common individual, but to the technical personnel and professional personnel that labors with them same. (S. Grainger) [es

  9. Radiation

    International Nuclear Information System (INIS)

    Davidson, J.H.

    1986-01-01

    The basic facts about radiation are explained, along with some simple and natural ways of combating its ill-effects, based on ancient healing wisdom as well as the latest biochemical and technological research. Details are also given of the diet that saved thousands of lives in Nagasaki after the Atomic bomb attack. Special comment is made on the use of radiation for food processing. (U.K.)

  10. Hacia una nueva Biología

    Directory of Open Access Journals (Sweden)

    Sandín, Máximo

    2002-05-01

    Full Text Available Not available

    «La victoria del darwinismo ha sido tan completa que es un shock darse cuenta de cuan vacía es realmente la visión darwiniana de la vida». Esta rotunda frase no parece significar solamente la manifestación de una opinión personal. Pertenece a un editorial publicado en Nature y fïrmado por Henry Gee, uno de sus comentaristas sobre evolución. El motivo de que una revista científica de las más prestigiosas (que se pueden considerar como las mantenedoras de la ortodoxia, haga suyo ese comentario es que las investigaciones más recientes (especialmente en el campo de la embriogénesis han revelado unos fenómenos que han puesto de manifiesto su absoluta incompatibilidad con la teoría darwinista de la evolución. Las consecuencias de esto son obvias, y las precisa otro editorialista de Nature, Philip Ball, en un comentario sobre la secuenciación del Genoma humano: «Los biólogos van a tener que construir una nueva Biología». Tenemos por delante un duro y largo trabajo científico por realizar, pero también tenemos una tarea previa: depurar la Biología de la, tan arraigada, terminología darwinista, cargada de conceptos y prejuicios deformadores de los fenómenos biológicos.

  11. Radiation

    International Nuclear Information System (INIS)

    Winther, J.F.; Ulbak, K.; Dreyer, L.; Pukkala, E.; Oesterlind, A.

    1997-01-01

    Exposure to solar and ionizing radiation increases the risk for cancer in humans. Some 5% of solar radiation is within the ultraviolet spectrum and may cause both malignant melanoma and non-melanocytic skin cancer; the latter is regarded as a benign disease and is accordingly not included in our estimation of avoidable cancers. Under the assumption that the rate of occurrence of malignant melanoma of the buttocks of both men and women and of the scalp of women would apply to all parts of the body in people completely unexposed to solar radiation, it was estimated that approximately 95% of all malignant melanomas arising in the Nordic populations around the year 2000 will be due to exposure to natural ultraviolet radiation, equivalent to an annual number of about 4700 cases, with 2100 in men and 2600 in women, or some 4% of all cancers notified. Exposure to ionizing radiation in the Nordic countries occurs at an average effective dose per capita per year of about 3 mSv (Iceland, 1.1 mSv) from natural sources, and about 1 mSv from man-made sources. While the natural sources are primarily radon in indoor air, natural radionuclides in food, cosmic radiation and gamma radiation from soil and building materials, the man-made sources are dominated by the diagnostic and therapeutic use of ionizing radiation. On the basis of measured levels of radon in Nordic dwellings and associated risk estimates for lung cancer derived from well-conducted epidemiological studies, we estimated that about 180 cases of lung cancer (1% of all lung cancer cases) per year could be avoided in the Nordic countries around the year 2000 if indoor exposure to radon were eliminated, and that an additional 720 cases (6%) could be avoided annually if either radon or tobacco smoking were eliminated. Similarly, it was estimated that the exposure of the Nordic populations to natural sources of ionizing radiation other than radon and to medical sources will each give rise to an annual total of 2120

  12. La Nueva Ruta de la Seda y la diplomacia internacional de negocios

    Directory of Open Access Journals (Sweden)

    Daniel Lemus Delgado

    2017-12-01

    Full Text Available En el presente trabajo se analiza la diplomacia internacional de negocios en el contexto de la Nueva Ruta de la Seda, la iniciativa geoeconómica más importante del gobierno chino. Se parte del supuesto teórico de la Interdependencia Compleja de Kohane y Nye, para señalar la magnitud de los obstáculos que se deberán solventar. Asimismo, se plantea como mecanismo complementario la participación directa de actores no estatales en la resolución de los conflictos y se sugiere que las empresas chinas con una participación en los proyectos de la Nueva Ruta de la Seda intervengan directamente en defensa de sus propios intereses comerciales, sin depender de su gobierno o de la diplomacia tradicional. Se debe recurrir a la diplomacia internacional de negocios para acercar las posiciones de las partes involucradas y aumentar las probabilidades de éxito del proyecto.

  13. Magnitude determination for large underground nuclear explosions

    Energy Technology Data Exchange (ETDEWEB)

    Porter, Lawrence D [Lawrence Radiation Laboratory, University of California, Livermore, CA (United States)

    1970-05-15

    A method is presented for determining the local magnitudes for large underground nuclear explosions. The Gutenberg-Richter nomograph is applied to the peak amplitudes for 24 large underground nuclear explosions that took place in Nevada. The amplitudes were measured at 18 California Wood-Anderson stations located 150-810 km from the explosion epicenter. The variation of the individual station magnitudes and magnitude corrections and the variation of the average and rms error estimates in the magnitude determinations are examined with respect to distance, azimuth, and event location. The magnitude prediction capability of the Gutenberg-Richter nomograph is examined on the basis of these two criteria, and certain corrections are suggested. The azimuthal dependence of the individual station magnitudes is investigated, and corrections for the California stations are calculated. Statistical weighting schemes for two-component data are employed, and the assumptions and limitations in the use of peak amplitudes are discussed. (author)

  14. Extreme value distribution of earthquake magnitude

    Science.gov (United States)

    Zi, Jun Gan; Tung, C. C.

    1983-07-01

    Probability distribution of maximum earthquake magnitude is first derived for an unspecified probability distribution of earthquake magnitude. A model for energy release of large earthquakes, similar to that of Adler-Lomnitz and Lomnitz, is introduced from which the probability distribution of earthquake magnitude is obtained. An extensive set of world data for shallow earthquakes, covering the period from 1904 to 1980, is used to determine the parameters of the probability distribution of maximum earthquake magnitude. Because of the special form of probability distribution of earthquake magnitude, a simple iterative scheme is devised to facilitate the estimation of these parameters by the method of least-squares. The agreement between the empirical and derived probability distributions of maximum earthquake magnitude is excellent.

  15. El trabajo en la pepena informal en México: nuevas realidades, nuevas desigualdades

    Directory of Open Access Journals (Sweden)

    José Juan Cervantes Niño

    2012-01-01

    Full Text Available Generalmente se afirma que las actividades de la pepena informal son algunas de las peores formas de empleo en México. Sin embargo, con base en la información de un estudio nacional y mediante una metodología de evaluación rápida, en este texto se destaca que muchas de las características típicas de dichas actividades han mutado y que en la actualidad se pueden encontrar nuevas realidades de esas ocupaciones, las cuales conllevan diferentes desigualdades, pero pueden inducir a una mejor formulación de intervenciones de política pública.

  16. NUEVAS ESPECIES COLOMBIANAS DE PHYLLOPHAGA HARRIS (COLEOPTERA: MELOLONTHIDAE: MELOLONTHINAE

    Directory of Open Access Journals (Sweden)

    MIGUEL ÁNGEL MORÓN

    2014-06-01

    Full Text Available Se describen tres Phyllophaga (s. str.: Phyllophaga velezangeli, nueva especie del grupo “schizorhina” recolectada en una localidad montañosa del departamento de Boyacá, ubicada a 1 989 m de altitud; y P. citarae, nueva especie del grupo “rorulenta” que habita en el bosque tropical perennifolio establecido a 70 m snm en Tutunendo, departamento de Chocó y P. densata chocoana, nueva subespecie del grupo “rugipennis” localizada en bosques tropicales perennifolios de Chocó y Risaralda. Phyllophaga densata densata (Moser se registra por primera ocasión para Colombia. Se incluyen ilustraciones de los caracteres diagnósticos, habitus y comentarios sobre sus diferencias con otras especies de los grupos citados.

  17. Cambio cultural y lectura. Hacia una nueva cultura lectora

    Directory of Open Access Journals (Sweden)

    Antonio BERNAL GUERRERO

    2017-07-01

    Full Text Available Las limitaciones de las prácticas lectoras actuales quizás puedan apreciarse mejor en el seno de los cambios culturales que se producen con el paso de la sociedad moderna a la posmoderna. Estas tecnologías de la vida cotidiana están cambiando pro- fundamente nuestras formas de trabajar, de relacionarnos, de vivir. La sacralización del libro propia de la modernidad pierde sentido en el mundo audiovisual actual, donde multitud de jóvenes descifran reglas y desarrollan nuevas destrezas usando los nuevos artefactos tecnológicos. La ignorancia de la vigencia de las nuevas prácticas culturales conduce al desencuentro cultural intergeneracional, que tanto daño está causando en los sistemas escolares. Las condiciones de las sociedades de la información reclaman un nuevo contexto para la cultura lectora, emergiendo nuevas posibilidades formativas.

  18. GESTIÓN EDUCATIVA AMBIENTAL PARA LA NUEVA RURALIDAD.

    Directory of Open Access Journals (Sweden)

    Soraya Husain N

    2014-05-01

    Full Text Available La nueva ruralidad implica una gestión ambiental educativa que forme competencias para el manejo de las cadenas de abastecimiento en los diferentes municipios en la cual los campesinos son partícipes de la producción, empaque, manejo, mercadeo y exportación de sus recursos. La investigación indaga cómo los estudiantes de grado once de tres municipios del oriente de Cundinamarca perciben y viven la realidad educativa ante los nuevos retos de la educación  en la nueva ruralidad. Se presenta un modelo pedagógico como apoyo a ésta nueva gestión.

  19. Nuevas tendencias del marketing: Marketing Experiencial y Street Marketing

    OpenAIRE

    Sánchez Casatejada, Ana Belén

    2015-01-01

    Ante la saturación de publicidad y marketing intrusivo al que está sometido el consumidor, las empresas deben tomar otra alternativa para promocionar sus productos haciendo uso de las nuevas tendencias del marketing. Dejando atrás el marketing tradicional, donde el eje principal era el producto, en esta nueva era es al consumidor al que hay que posicionar en el eje. El marketing experiencial a través de sus técnicas conecta con el consumidor de una forma emocional, haciéndole partícipe de la ...

  20. Nuevas aportaciones a la ictiofauna marina de Galicia

    OpenAIRE

    Bañón, R.; Cerdeira, J.D.; Ferreiro, P.; Sande, C.M.

    2007-01-01

    El número de especies de peces nuevas o raras en Galicia se ha incrementado en los últimos años gracias a un mayor esfuerzo científico y un contacto más estrecho con el sector pesquero, lo cual ha permitido obtener un mejor conocimiento de la ictiofauna marina (Bañón, 2002). En este trabajo se aportan nuevas citas sobre la presencia de cuatro especies de osteictios raras o poco conocidas para las aguas de Galicia. La biometría de los ejemplares analizados se da e...

  1. Una nueva especie de Calyptranthes Sw. (Myrtaceae de Colombia

    Directory of Open Access Journals (Sweden)

    Parra Osorio Carlos Alberto

    2001-12-01

    Full Text Available Se describe e ilustra una nueva especie de Calyptranthes (Myrtaceae de la Sierra Nevada de Santa Marta de Colombia. Se discuten las afinidades taxonómicas de la nueva especie y su distribución en los Andes del norte de Suramérica.A new species of Calyptranthes (Myrtaceae from Sierra Nevada de Santa Marta, in Colombia, is described and illustrated. The taxonomic affinities and the distribution of the new species in the Andes of the northern part of Southamerica are discussed.

  2. Numerical Magnitude Representations Influence Arithmetic Learning

    Science.gov (United States)

    Booth, Julie L.; Siegler, Robert S.

    2008-01-01

    This study examined whether the quality of first graders' (mean age = 7.2 years) numerical magnitude representations is correlated with, predictive of, and causally related to their arithmetic learning. The children's pretest numerical magnitude representations were found to be correlated with their pretest arithmetic knowledge and to be…

  3. Representations of the Magnitudes of Fractions

    Science.gov (United States)

    Schneider, Michael; Siegler, Robert S.

    2010-01-01

    We tested whether adults can use integrated, analog, magnitude representations to compare the values of fractions. The only previous study on this question concluded that even college students cannot form such representations and instead compare fraction magnitudes by representing numerators and denominators as separate whole numbers. However,…

  4. Magnitude of localized magnetic moments in metals

    International Nuclear Information System (INIS)

    Kiwi, M.; Pestana, E.; Ramirez, R.

    1979-01-01

    The magnitude of the localized magnetic moment of a transition or rare earth element impurity in a metal is evaluated within the framework of the Anderson model. Rotational invariance is preserved throughout. Graphs of the magnitude of the magnetization as a function of the relevant parameters of the model are provided and discussed. (author)

  5. Local magnitudes of small contained explosions.

    Energy Technology Data Exchange (ETDEWEB)

    Chael, Eric Paul

    2009-12-01

    The relationship between explosive yield and seismic magnitude has been extensively studied for underground nuclear tests larger than about 1 kt. For monitoring smaller tests over local ranges (within 200 km), we need to know whether the available formulas can be extrapolated to much lower yields. Here, we review published information on amplitude decay with distance, and on the seismic magnitudes of industrial blasts and refraction explosions in the western U. S. Next we measure the magnitudes of some similar shots in the northeast. We find that local magnitudes ML of small, contained explosions are reasonably consistent with the magnitude-yield formulas developed for nuclear tests. These results are useful for estimating the detection performance of proposed local seismic networks.

  6. Nuevas formas de hacer, nuevas formas de ser: las tecnologías digitales como agentes dinamizadores del aprendizaje informal

    OpenAIRE

    López Gil, Mónica María

    2014-01-01

    Entre los cambios sufridos durante los últimos años, destacamos la revolución tecnológica. Es innegable que en la actualidad vivimos una utilización masiva de herramientas electrónicas que han transformado, y siguen transformando, nuestras maneras de comunicarnos, nos entretenemos, usamos nuestro tiempo Suoronta (2003), nos formamos o trabajamos. Siendo así, por tanto, se están demandando nuevas formas de saber y de saber hacer así como se están creando nuevas formas de ser y hacer (Delors, 1...

  7. Discounting Behaviour and the Magnitude Effect

    DEFF Research Database (Denmark)

    Andersen, Steffen; Harrison, Glenn W.; Lau, Morten Igel

    2013-01-01

    We evaluate the claim that individuals exhibit a magnitude effect in their discounting behaviour, where higher discount rates are inferred from choices made with lower principals, all else being equal. If the magnitude effect is quantitatively significant, it is not appropriate to use one discount...... rate that is independent of the scale of the project for cost–benefit analysis and capital budgeting. Using data from a field experiment in Denmark, we find statistically significant evidence of a magnitude effect that is much smaller than is claimed. This evidence surfaces only if one controls...

  8. Aeropuerto de Nueva York. Nuevo hangar para reactores

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1960-09-01

    Full Text Available El nuevo hangar del Aeropuerto Internacional de Idlewild, de Nueva York (EE. UU., proyectado y construido bajo la dirección del Port of New York Authority, destinado a los servicios de líneas aéreas extranjeras, está formado por una estructura central metálica, que constituye el cuerpo resistente del hangar.

  9. Marketing 2.0: La nueva forma de hacer marketing.

    OpenAIRE

    Morón Redondo, Ana

    2014-01-01

    La web 2.0 ha revolucionado el concepto de marketing empresarial, dando lugar a una nueva corriente de colaboración y comunicación multidireccional on-line empresa-usuario a través de Internet y de las redes sociales. Grado en Administración y Dirección de Empresas

  10. Nuevas tecnologías en tiempos de paradojas

    Directory of Open Access Journals (Sweden)

    Osvaldo León

    2015-01-01

    Full Text Available Explica el impacto que han tenido las nuevas tecnologías en la era de la "Sociedad de la Información y la Comunicación". Comenta lo que se entiende por revolución digital, concentración monopólica y la Red de Redes, el Internet.

  11. Determination of the Meteor Limiting Magnitude

    Science.gov (United States)

    Kingery, A.; Blaauw, R.; Cooke, W. J.

    2016-01-01

    The limiting meteor magnitude of a meteor camera system will depend on the camera hardware and software, sky conditions, and the location of the meteor radiant. Some of these factors are constants for a given meteor camera system, but many change between meteor shower or sporadic source and on both long and short timescales. Since the limiting meteor magnitude ultimately gets used to calculate the limiting meteor mass for a given data set, it is important to have an understanding of these factors and to monitor how they change throughout the night, as a 0.5 magnitude uncertainty in limiting magnitude translates to a uncertainty in limiting mass by a factor of two.

  12. The Magnitude of Atherogenic Dyslipidaemia among Geriatric ...

    African Journals Online (AJOL)

    The Magnitude of Atherogenic Dyslipidaemia among Geriatric Nigerians with ... June 2011 on 122 consecutive geriatric patients with systemic hypertension ... of dyslipidaemia and a marker of dyslipidaemic cardiometabolic risk among them.

  13. Measuring radon source magnitude in residential buildings

    International Nuclear Information System (INIS)

    Nazaroff, W.W.; Boegel, M.L.; Nero, A.V.

    1981-08-01

    A description is given of procedures used in residences for rapid grab-sample and time-dependent measurements of the air-exchange rate and radon concentration. The radon source magnitude is calculated from the results of simultaneous measurements of these parameters. Grab-sample measurements in three survey groups comprising 101 US houses showed the radon source magnitude to vary approximately log-normally with a geometric mean of 0.37 and a range of 0.01 to 6.0 pCi 1 -1 h -1 . Successive measurements in six houses in the northeastern United States showed considerable variability in source magnitude within a given house. In two of these houses the source magnitude showed a strong correlation with the air-exchange rate, suggesting that soil gas influx can be an important transport process for indoor radon

  14. Una especie nueva del género Trichomanes Una especie nueva del género Trichomanes

    Directory of Open Access Journals (Sweden)

    Murillo Pulido María Teresa

    1991-12-01

    Full Text Available Se describe una especie nueva del género Trichomanes L., familia Hymenophyllaceae, T.lozanii Murillo coleccionada en la Isla Gorgona, Municipio de Guapí, Departamento del Cauca. A new specie of Trichomanes L. (Hymenophyllaceae, T. lozanii Murillo, is described; it was collected in Isla Gorgona, Municipio de Guapí, Departamento del Cauca.

  15. Nuevas audiencias, nuevas responsabilidades. La competencia mediática en la era de la convergencia digital

    Directory of Open Access Journals (Sweden)

    Yamile Sandoval Romero

    2012-08-01

    Full Text Available Partiendo de la trascendencia del pujante y emergente concepto de “competencia mediática”, este trabajo se centra en la evolución de la creciente omnipresencia de las tecnologías comunicativas en la sociedad del info-ocio digital, especialmente la brusca irrupción de la red Internet en nuestras vidas. Los relevantes cambios espacio-temporales que ya se venían gestando gracias a la “era de la televisión”, se han magnificado en esta nueva época de la red de redes, presentado retos novedosos a esta “sociedad de las pantallas” que se enfrenta a nuevas audiencias, expuestas permanentemente a una pluralidad de multipantallas, cada día más accesibles, asequibles y universales. El trabajo se centra en la sociedad digital en un contexto de convergencia digital esbozando los profundos cambios sociales en el que surgen nuevas audiencias, a veces escasamente cualificadas para afrontar estos universos digitales. Sin duda, está emergiendo una nueva generación, que se vislumbran autodidacta, con jóvenes capaces de comunicarse y producir con los dispositivos tecnológicos a los que tienen acceso, a veces con escasas competencias mediáticas. Este, hasta hace poco tiempo, inimaginable contexto se dibuja por la nítida desigualdad entre nativos y migrantes digitales, en una doble condición de responsabilidad, porque las nuevas posibilidades de acceso, distribución, consumo y producción de información y conocimiento exigen un replanteamiento de preguntas, estrategias y participación, ante unas audiencias más expuestas y menos formadas.

  16. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative magnitudes ICRU, for external fields of radiation beta. Part IV. Survey of the angular response of instruments used in radiological protection in secondary patron fields of beta radiation (90Sr/90Y (1850 MBq and 74 MBq), 204TI (18.5 MBq) and 147Pm (518 MBq)

    International Nuclear Information System (INIS)

    Alvarez R, J.T.

    1994-02-01

    Tests type were made (type test) in the following commercial instrumentation commonly used in radiological protection: Geiger-Mueller Counters (FH40 FE), Plastic Scintillators (NE-BP/6/4A), Ionization Chambers (RO-5) and Proportional Counters (HP-100A; gas:P-10). With object of checking the possibility that these they can carry out the new operative unit ICRU, H' (0.07; α). The tests consisted on determining the energy and angular response of the detectors in secondary patron fields of beta radiation, for isotopes of 90 Sr/ 90 Y (1850 MBq and 74 MBq and 147 Pm(518 MBq). The results show the inadequate of these commercial instruments for the realization of the H' operative unit (0.07; α) in beta external fields. Due to flaws in the design, construction and calibration of the instruments for this type of radiation fields (Author)

  17. Asymmetry in power-law magnitude correlations.

    Science.gov (United States)

    Podobnik, Boris; Horvatić, Davor; Tenenbaum, Joel N; Stanley, H Eugene

    2009-07-01

    Time series of increments can be created in a number of different ways from a variety of physical phenomena. For example, in the phenomenon of volatility clustering-well-known in finance-magnitudes of adjacent increments are correlated. Moreover, in some time series, magnitude correlations display asymmetry with respect to an increment's sign: the magnitude of |x_{i}| depends on the sign of the previous increment x_{i-1} . Here we define a model-independent test to measure the statistical significance of any observed asymmetry. We propose a simple stochastic process characterized by a an asymmetry parameter lambda and a method for estimating lambda . We illustrate both the test and process by analyzing physiological data.

  18. Las nuevas tecnologías en el campo educativo

    Directory of Open Access Journals (Sweden)

    Felix Antonio Malagón Malagón

    2001-07-01

    Full Text Available Este artículo responde a la necesidad de reconocer cómo el surgimiento y el desarrollo de las Nuevas Tecnologías de la Información y la Comunicación - NTIC - han cambiado en forma acelerada la visión global del mundo, del conocimiento y de la cultura; cómo estas nuevas herramientas proyectan a la humanidad hacia la innovación, la creatividad, los cambios tecnológicos y sociales y hacia el desarrollo de técnicas, estrategias y mecanismos educativos donde Internet juega un papel preponderante y central en toda esta revolución tecnológica.

  19. Nuevas lecturas de epigrafía hispana

    Directory of Open Access Journals (Sweden)

    Javier del Hoyo Calleja

    1989-01-01

    Full Text Available El presente artículo tiene por objeto ofrecer nueva lectura de distintos epígrafes ya publicados y comentados. Estos no tienen otro punto en común que el de su nueva lectura. No se relacionan entre sí por el lugar de hallazgo o conservación, interés prosopográfico, histórico, etc. De algunos he evitado presentar datos que ya han sido publicados y puestos al día sucesivamente; pueden revisarse en las referencias bibliográficas. No pretendo, por tanto, hacer el comentario exhaustivo que suele llevarse a cabo con un epígrafe inédito: clase de inscripción, tipo de soporte, material y calidad del mismo, dimensiones, etc., sino tan sólo aportar aquellos datos, o puntos dignos de comentario, que hasta ahora no han sido abordados.

  20. El mundo rural latinoamericano y la nueva ruralidad

    Directory of Open Access Journals (Sweden)

    Edelmira Pérez C.

    2004-04-01

    Full Text Available Es indudable la importancia del debate actual en América Latina acerca de las nuevas concepciones del desarrollo rural. Se empieza a presentar una coincidencia en la necesidad de darle a éste un enfoque territorial y a ello ha contribuido el aporte de la mirada de desarrollo rural de la Unión Europea, pero también la visión de “nueva ruralidad” que han venido planteando distintos estudiosos del continente, de manera especial en los últimos diez años.Aunque el mundo rural ha tenido grandes transformaciones, aún persisten en América Latina rezagos estructurales que impiden la incorporación de las áreas rurales y de sus pobladores a las dinámicas actuales del desarrollo los cuales son analizados en este artículo.

  1. EL MUNDO RURAL LATINOAMERICANO Y LA NUEVA RURALIDAD

    Directory of Open Access Journals (Sweden)

    Edelmira Pérez C.

    2004-01-01

    Full Text Available Es indudable la importancia del debate actual en América Latina acerca de las nuevas concepciones del desarrollo rural. Se empieza a presentar una coincidencia en la necesidad de darle a éste un enfoque territorial y a ello ha contribuido el aporte de la mirada de desarrollo rural de la Unión Europea, pero también la visión de "nueva ruralidad" que han venido planteando distintos estudiosos del continente, de manera especial en los últimos diez años. Aunque el mundo rural ha tenido grandes transformaciones, aún persisten en América Latina rezagos estructurales que impiden la incorporación de las áreas rurales y de sus pobladores a las dinámicas actuales del desarrollo los cuales son analizados en este artículo.

  2. Local magnitude, duration magnitude and seismic moment of Dahshour 1992 earthquakes

    Directory of Open Access Journals (Sweden)

    M. F. Abdelwahed

    2000-06-01

    Full Text Available Local magnitudes ML have been calculated for 56 earthquakes of the Dahshour 1992 sequence using simulated records of the KEG broadband station and the estimated calibration function of the Dahshour area. These were compared with their corresponding values of duration magnitudes obtained from the analog short period seismograms of the HLW station. The local magnitudes M L and the duration magnitudes M D for this region imply a linear relation as follows: M L = 1.2988 (± 0.04 M D – 0.9032 (± 0.14. Seismic moment has also been estimated for these events using simple measurements from the time domain records. These measurements based on the simulated Wood Anderson seismograms are used for the local magnitude (ML estimation. The derived relationship between seismic moment (M 0 and magnitude (M L is: log (M 0 = 0.954 (± 0.019 M L + 17.258 (± 0.075.

  3. Nueva benzoil lactona y otros costituyentes de pilocarpus alvaradoii (rutaceae)

    OpenAIRE

    Cuca, Luis E.; Avila, Mónica C.

    2008-01-01

    Del extracto etanólico de hojas de Pilocarpus alvaradoii fue aislada e identificada la nueva lactona α-Benzoil-γ-valerolactona (1), junto con los triterpenos pentacíclicos conocidos lupeol (2), epibetulina (3); y las furanocumarinas bergapteno (4), psoraleno (5), y xantotoxina (6).  El aislamiento y la purificación fueron realizados por técnicas cromatográficas convencionales.   La elucidación estructural de estos compuestos...

  4. Allamanda schottii (Apocynaceae: nueva cita para la Flora Argentina

    Directory of Open Access Journals (Sweden)

    Julio A. Hurrell

    2013-01-01

    Full Text Available En este trabajo Allamanda schottii Pohl (Apocynaceae es documentada como nueva cita genérica y específica para la Flora Argentina. La especie fue hallada en la ribera del Paraná, en el norte de la provincia de Corrientes, Argentina. Se incluye su sinonimia, descripción, comentarios sobre su distribución, hábitat, fenología, biología reproductiva, nombres vulgares, usos y observaciones.

  5. Una nueva especie de Adesmia (Leguminosae, Papilionoideae para la Argentina

    Directory of Open Access Journals (Sweden)

    Emilio A. Ulibarri

    2010-01-01

    Full Text Available Se describe e ilustra Adesmia australis (serie Frigidae, una nueva especie de la provincia de Santa Cruz, que se distingue de su especie más afín, A. frigida, por el número y tamaño de los folíolos, el tamaño de las flores y estípulas isomorfas.

  6. Colour-magnitude diagram of NGC 5053

    Energy Technology Data Exchange (ETDEWEB)

    Walker, M F; Pike, C D [California Univ., Santa Cruz (USA). Lick Observatory; McGee, J D

    1976-06-01

    The colour-magnitude diagram of NGC 5053 has been derived to V = 21.1 from photographic and electronographic observations. The electronographic observations were obtained with an experimental Spectracon image-converter, having photocathode and exit window dimensions of 20 x 30 mm, mounted at the prime-focus of the 120-in. Lick reflector. The photographic observations were obtained with the 20-in. Carnegie astrograph and the 36-in. Crossley reflector. The colour-magnitude diagram resembles that of M92, with the difference that a red horizontal branch is more pronounced than the asymptotic branch in NGC 5053. The topology of the horizontal branch is that of clusters with an intermediate metal content and is thus at variance with the mean period of the RR Lyr stars and the unreddened colour of the subgiant branch read at the magnitude level of the horizontal branch, both of which would indicate an extremely low metal content. If comparison of the colour-magnitude diagrams of NGC 5053 and M92 is valid, then the reddening of NGC 5053 is Esub(B-V) = 0.02 and the apparent distance modulus is m-M = 16.08 +- 0.08.

  7. Interaction of Number Magnitude and Auditory Localization.

    Science.gov (United States)

    Golob, Edward J; Lewald, Jörg; Jungilligens, Johannes; Getzmann, Stephan

    2016-01-01

    The interplay of perception and memory is very evident when we perceive and then recognize familiar stimuli. Conversely, information in long-term memory may also influence how a stimulus is perceived. Prior work on number cognition in the visual modality has shown that in Western number systems long-term memory for the magnitude of smaller numbers can influence performance involving the left side of space, while larger numbers have an influence toward the right. Here, we investigated in the auditory modality whether a related effect may bias the perception of sound location. Subjects (n = 28) used a swivel pointer to localize noise bursts presented from various azimuth positions. The noise bursts were preceded by a spoken number (1-9) or, as a nonsemantic control condition, numbers that were played in reverse. The relative constant error in noise localization (forward minus reversed speech) indicated a systematic shift in localization toward more central locations when the number was smaller and toward more peripheral positions when the preceding number magnitude was larger. These findings do not support the traditional left-right number mapping. Instead, the results may reflect an overlap between codes for number magnitude and codes for sound location as implemented by two channel models of sound localization, or possibly a categorical mapping stage of small versus large magnitudes. © The Author(s) 2015.

  8. Incentive theory: IV. Magnitude of reward

    OpenAIRE

    Killeen, Peter R.

    1985-01-01

    Incentive theory is successfully applied to data from experiments in which the amount of food reward is varied. This is accomplished by assuming that incentive value is a negatively accelerated function of reward duration. The interaction of the magnitude of a reward with its delay is confirmed, and the causes and implications of this interaction are discussed.

  9. Regional moment: Magnitude relations for earthquakes and explosions

    Energy Technology Data Exchange (ETDEWEB)

    Patton, H.J.; Walter, W.R. (Lawrence Livermore National Lab., CA (United States))

    1993-02-19

    The authors present M[sub o]:m[sub b] relations using m[sub b](P[sub n]) and m[sub b](L[sub g]) for earthquakes and explosions occurring in tectonic and stable areas. The observations for m[sub b](P[sub n]) range from about 3 to 6 and show excellent separation between earthquakes and explosions on M[sub o]:m[sub b] plots, independent of the magnitude. The scatter in M[sub o]:M[sub b] observations for NTS explosions is small compared to the earthquake data. The M[sub o]:m[sub b](L[sub g]) data for Soviet explosions overlay the observations for US explosions. These results, and the small scatter for NTS explosions, suggest weak dependence of M[sub o]:m[sub b] relations on emplacement media. A simple theoretical model is developed which matches all these observations. The model uses scaling similarity and conservation of energy to provide a physical link between seismic moment and a broadband seismic magnitude. Three factors, radiation pattern, material property, and apparent stress, contribute to the separation between earthquakes and explosions. This theoretical separation is independent of broadband magnitude. For US explosions in different media, the material property and apparent stress contributions are shown to compensate for one another, supporting the observations that M[sub o]:M[sub b] is nearly independent of source geology. 19 refs., 2 figs., 1 tab.

  10. Local magnitude, duration magnitude and seismic moment of Dahshour 1992 earthquakes

    OpenAIRE

    M. F. Abdelwahed; E. M. Abdelrahman; H. M. Hussein; M. M. Dessokey

    2000-01-01

    Local magnitudes ML have been calculated for 56 earthquakes of the Dahshour 1992 sequence using simulated records of the KEG broadband station and the estimated calibration function of the Dahshour area. These were compared with their corresponding values of duration magnitudes obtained from the analog short period seismograms of the HLW station. The local magnitudes M L and the duration magnitudes M D for this region imply a linear relation as follows: M L = 1.2988 (± 0.04) M D – 0.9032 (± 0...

  11. La ‘nueva ruralidad’ en Cañuelas. Entre la agroecología y las nuevas urbanizaciones

    Directory of Open Access Journals (Sweden)

    Fernando González

    2015-04-01

    Full Text Available Las transformaciones de la Región Metropolitana de Buenos Aires han impactado en territorios rurales. Es el caso de Cañuelas, donde “proyectos de desarrollo urbano” han avanzado, con lo cual desplazaron actividades agrícolas. No obstante, algunos de ellos intentan ser parte de la “nueva ruralidad” que se busca para el partido.Esta investigación exploratoria busca contribuir al estado del arte sobre “nueva ruralidad”. Específicamente, indagamos sobre transformaciones territoriales y modelos de desarrollo que se disputan hegemonía en el territorio. Se utiliza un enfoque que conjuga estudios urbanos y rurales, una metodología cualitativa y basada en fuentes secundarias. Los resultados plantean una difícil convivencia entre usos del suelo.

  12. Dos especies nuevas de Ouratea Aublet (Ochnaceae de Colombia Dos especies nuevas de Ouratea Aublet (Ochnaceae de Colombia

    Directory of Open Access Journals (Sweden)

    Sastre C.

    1986-12-01

    Full Text Available Two new colombian species of Ouratea Aublet (Ochnaceae are described. Relationships are established with O. gigantophylla (Erhard Engler and O. macrophylla van Tieghem.   Entre el material de Ouratea Aublet (Ochnaceae recolectado recientemente en Colombia, no he podido referir tres especímenes a las especies ya descritas.  Estas plantas pertenecen a dos especies nuevas, sistemáticamente cercanas a O. gigantophylla (Erhard Engler y a O. macrophylla van Tieghem.

  13. Absolute-magnitude distributions of supernovae

    Energy Technology Data Exchange (ETDEWEB)

    Richardson, Dean; Wright, John [Department of Physics, Xavier University of Louisiana, New Orleans, LA 70125 (United States); Jenkins III, Robert L. [Applied Physics Department, Richard Stockton College, Galloway, NJ 08205 (United States); Maddox, Larry, E-mail: drichar7@xula.edu [Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, LA 70402 (United States)

    2014-05-01

    The absolute-magnitude distributions of seven supernova (SN) types are presented. The data used here were primarily taken from the Asiago Supernova Catalogue, but were supplemented with additional data. We accounted for both foreground and host-galaxy extinction. A bootstrap method is used to correct the samples for Malmquist bias. Separately, we generate volume-limited samples, restricted to events within 100 Mpc. We find that the superluminous events (M{sub B} < –21) make up only about 0.1% of all SNe in the bias-corrected sample. The subluminous events (M{sub B} > –15) make up about 3%. The normal Ia distribution was the brightest with a mean absolute blue magnitude of –19.25. The IIP distribution was the dimmest at –16.75.

  14. Improving Children's Knowledge of Fraction Magnitudes.

    Directory of Open Access Journals (Sweden)

    Lisa K Fazio

    Full Text Available We examined whether playing a computerized fraction game, based on the integrated theory of numerical development and on the Common Core State Standards' suggestions for teaching fractions, would improve children's fraction magnitude understanding. Fourth and fifth-graders were given brief instruction about unit fractions and played Catch the Monster with Fractions, a game in which they estimated fraction locations on a number line and received feedback on the accuracy of their estimates. The intervention lasted less than 15 minutes. In our initial study, children showed large gains from pretest to posttest in their fraction number line estimates, magnitude comparisons, and recall accuracy. In a more rigorous second study, the experimental group showed similarly large improvements, whereas a control group showed no improvement from practicing fraction number line estimates without feedback. The results provide evidence for the effectiveness of interventions emphasizing fraction magnitudes and indicate how psychological theories and research can be used to evaluate specific recommendations of the Common Core State Standards.

  15. Evaluation of the magnitude of EBT Gafchromic film polarization effects.

    Science.gov (United States)

    Butson, M J; Cheung, T; Yu, P K N

    2009-03-01

    Gafchromic EBT film, has become a main dosimetric tools for quantitative evaluation of radiation doses in radiation therapy application. One aspect of variability using EBT Gafchromic film is the magnitude of the orientation effect when analysing the film in landscape or portrait mode. This work has utilized a > 99% plane polarized light source and a non-polarized diffuse light source to investigate the absolute magnitude of EBT Gafchromic films polarization or orientation effects. Results have shown that using a non-polarized light source produces a negligible orientation effect for EBT Gafchromic film and thus the angle of orientation is not important. However, the film exhibits a significant variation in transmitted optical density with angle of orientation to polarized light producing more than 100% increase, or over a doubling of measured OD for films irradiated with x-rays up to dose levels of 5 Gy. The maximum optical density was found to be in a plane at an angle of 14 degrees +/- 7 degrees (2 SD) when the polarizing sheet is turned clockwise with respect to the film. As the magnitude of the orientation effect follows a sinusoidal shape it becomes more critical for alignment accuracy of the film with respect to the polarizing direction in the anticlockwise direction as this will place the alignment of the polarizing axes on the steeper gradient section of the sinusoidal pattern. An average change of 4.5% per 5 degrees is seen for an anticlockwise polarizer rotation where as the effect is 1.2% per 5 degrees for an clockwise polarizer rotation. This may have consequences to the positional accuracy of placement of the EBT Gafchromic film on a scanner as even a 1 degree alignment error can cause an approximate 1% error in analysis. The magnitude of the orientation effect is therefore dependant on the degree of polarization of the scanning light source and can range from negligible (diffuse LED light source) through to more than 100% or doubling of OD variation

  16. Evaluation of the magnitude of EBT Gafchromic film polarization effects

    International Nuclear Information System (INIS)

    Cheung, T.; Yu, P.K.N.; Butson, M.J.

    2009-01-01

    Gafchromic EBT film, has become a main dosimetric tools for quantitative evaluation of radiation doses in radiation therapy application. One aspect of variability using EBT Gafchromic film is the magnitude of the orientation effect when analysing the film in landscape or portrait mode. This work has utilized a >99% plane polarized light source a non-polarized diffuse light source to investigate the absolute magnitude of EBT Gafchromic films polarization or orientation effects. Results have shown that using a non-polarized light source produces a negligible orientation effect for EBT Gafchromic film and thus the angle of orientation is not important. However, the film exhibits a significant variation in transmitted optical density with angle of orientation to polarized light producing more than 100% increase, or over a doubling of measured O D for films irradiated with x-rays up to dose levels of 5 Gy. The maximum optical density was found to be in a plane at an angle of 14 0 ± 7 0 (2 S D) when the polarizing sheet is turned clockwise with respect to the film. As the magnitude of the orientation effects follows a sinusoidal shape it becomes more critical for alignment accuracy of the film with respect to the polarizing direction in the anticlockwise direction as this will place the alignment of the polarizing axes on the steeper gradient section of the sinusoidal pattern. An average change of 4.5 % per 5 0 is seen for an anticlockwise polarizer rotation where as the effect is 1.2 % per 5 0 for an clockwise polarizer rotation. This may have consequences to the positional accuracy of placement of the EBT Gafchromic film on a scanner as even a 1 0 alignment error can cause an approximate 1 % error in analysis. The magnitude of the orientation effect is therefore dependant on the degree of polarization of the scanning light source and can range from negligible (diffuse LED light source) through to more than 100% or doubling of O D variation with a fully linear

  17. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative ICRU magnitudes, for external fields of beta radiation. Part III. Determination of the joint of factors of angular conversion for the secondary source pattern Nr. - 86 Of (1850) MBq; Medicion de dosis equivalente con dosimetros personales e instrumentacion de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion Beta externos. Parte III. Determinacion del conjunto de factores de conversion angular para la fuente patron secundario Nr.- 86 de (1850) MBq

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-02-15

    It determined the assembly of factors of angular conversion T(0;{alpha}), for the source secondary pattern of {sup 90}Sr/{sup 90}Y (1850 MBq) at a distance detecting source of 30 cm, in the following angles: 0, 15, 30, 45, 60 and 75{sup 0}. Obtaining the values of: 1.01, 1.05, 1.13, 1.19 and 0.95, respectively. Their Global uncertainty is smaller to 1.5% for all the cases and its percentage differences with regard to the values reported by the Draft of the norm ISO 6980(1992) they are smaller to 3.0% for all the cases.The technique employee was that of the extrapolation Chamber and the treatment of the uncertainties is made of agreement with the recommendations of the BIPM. (Author)

  18. Alimentos con calidad. Nuevas estrategias rurales para nuevos consumidores

    OpenAIRE

    Aguilar Criado, Encarnación; Amaya Corchuelo, Santiago; López Moreno, Ignacio

    2016-01-01

    Este texto profundiza en uno de los aspectos que caracteriza a la nueva ruralidad: la progresiva especialización de los espacios rurales en producción de calidad y el uso de marcas distintivas. Este tipo de estrategia de creación de valor añadido en los productos alimentarios ha sido una de las líneas prioritarias de los Programas de Desarrollo Rural en Europa desde los inicios del siglo xxi. Esta incesante proliferación de marcas de calidad de productos agroalimentarios denota la profunda tr...

  19. Dos especies nuevas de calathea (Marantaceae de la Amozonia Colombiana

    Directory of Open Access Journals (Sweden)

    Suárez Stella

    2000-07-01

    Full Text Available Two new species of Marantaceae from Amazonian Colombia are described and illustrated: Calathea caquetensis and C. compacta. C. caquetensis is apparently related to C. attenuata and C. silvosa. C. compacta seems to be related to C. ecuminata, C. pearcei and C. schunkei.Se describen e ilustran dos especies nuevas de Marantaceae de la Amazonia colombiana: Calathea caquetensís y C. compacta. C. caquetensis está aparentemente relacionada con C. attenuata y C. silvosa. C compacta parece estar relacionada con C. acuminata, C. pearcei y C. schunkei.

  20. El deporte en la ciudad: una nueva manera de verlo

    Directory of Open Access Journals (Sweden)

    Marta Carranza

    2008-03-01

    Full Text Available Barcelona y el deporte forman ya un binomio indisoluble e indiscutible. Por una parte, la larga tradición deportiva de la ciudad fundamentada por un tejido asociativo centenario, potente y vanguardista; por otra, la experiencia y el reconocimiento internacional de Barcelona como organizadora y sede de acontecimientos deportivos, y finalmente, la amplia red docente y de investigación relacionada con la actividad deportiva, nos dan las condiciones idóneas y los ingredientes básicos para poder elaborar, de forma compartida, una nueva receta deportiva barcelonesa con secretos del pasado y productos del siglo xxi: un deporte que construye socialmente la ciudad.

  1. La escuela y las nuevas formas de convivencia

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Estrada

    2016-06-01

    Full Text Available Actualmente, en las escuelas aumenta la reproducción de dinámicas de convivencia negativas, las cuales están siendo consideradas como nuevas, aunque siempre han estado presentes, esto se debe a que se trata de un tema que recientemente retomó importancia. Dentro de las principales manifestaciones se encuentra el acoso escolar, en todas sus modalidades: mobbing, bullying, acoso del docente al alumno y acoso del alumno al docente. Algunos de los detonantes del citado fenómeno son el ambiente y el clima escolar.

  2. NUEVA BENZOIL LACTONA Y OTROS COSTITUYENTES DE Pilocarpus alvaradoii (Rutaceae

    Directory of Open Access Journals (Sweden)

    Luis E. Cuca

    2008-04-01

    Full Text Available Del extracto etanólico de hojas de Pilocarpus alvaradoii fue aislada e identificada la nueva lactona α-Benzoil-γ-valerolactona (1, junto con los triterpenos pentacíclicos conocidos lupeol (2, epibetulina (3; y las furanocumarinas bergapteno (4, psoraleno (5, y xantotoxina (6.  El aislamiento y la purificación fueron realizados por técnicas cromatográficas convencionales.   La elucidación estructural de estos compuestos se determinó mediante técnicas espectroscópicas (IR, RMN 1H, 13C, EM.

  3. NUEVA BENZOIL LACTONA Y OTROS CONSTITUYENTES DE Pilocarpus alvaradoii (Rutaceae)

    OpenAIRE

    Cuca, Luis E.; Ávila, Mónica C.

    2007-01-01

    Del extracto etanólico de hojas de Pilocarpus alvaradoii fue aislada e identificada la nueva lactona α-Benzoil-γ-valerolactona 1, junto con los triterpenos pentacíclicos conocidos lupeol 2, y epibetulina 3; y las furanocumarinas bergapteno 4, psoraleno 5, y xantotoxina 6. El aislamiento y la purificación fueron realizados por técnicas cromatográficas convencionales. La elucidación estructural de estos compuestos se determinó mediante técnicas espectroscópicas (IR, RMN 1H, 13C, EM). From th...

  4. Buddleja filibracteolata (Buddlejaceae, una nueva especie para Costa Rica

    Directory of Open Access Journals (Sweden)

    Morales, J. Francisco

    2007-12-01

    Full Text Available Buddleja filibracteolata (Buddlejaceae, a new species from Costa Rica is described and illustrated and its relationships with B. crotonoides A. Gray are discussed. Buddleja filibracteolata is distinguished by its sessile leaves, amplexicaul leaf blades, and spiciform inflorescence with numerous and conspicuous threadlike bracteoles.Se describe e ilustra Buddleja filibracteolata (Buddlejaceae, una nueva especie de Costa Rica, y se compara con la especie más cercana, B. crotonoides A. Gray. Buddleja filibracteolata se diferencia por sus hojas sesiles, láminas foliares amplexicaules y por sus inflorescencias espiciformes con numerosas y conspicuas brácteas filiformes.

  5. Nuevas pistas en la antropología del desarrollo

    Directory of Open Access Journals (Sweden)

    Ana Toledo Chávarri

    2007-05-01

    Full Text Available El seminario “Nuevas pistas en antropología del desarrollo” formó parte de las actividades de revisión anuales que se organizaron en L'Ecole de Hautes Etudes en Sciences Sociales (EHESS. En esta ocasión, Jean Pierre Olivier de Sardan fue el encargado de dirigir este encuentro que pretendía describir las transformaciones ocurridas en las formas de ayuda al desarrollo y en las interacciones entre instituciones de desarrollo y las poblaciones destinatarias.

  6. Tres nuevas especies de Sterculia L. (Sterculiaceae) de Venezuela

    OpenAIRE

    MONDRAGÓN, Alcides

    2005-01-01

    Como resultado del estudio taxonómico del género Sterculia L. (Sterculiaceae) en Venezuela, se describen tres nuevas especies: Sterculia abbreviata, procedente de los estados Amazonas, Aragua, Delta Amacuro, Mérida y Miranda; S. amazonica, a lo largo del Río Ocamo del estado Amazonas, y estado Bolívar; S. steyermarkii, en bosques siempreverdes en las costas del estado Miranda y en el estado Mérida. As a result of a taxonomical study of the genus Sterculia L. (Sterculiaceae) in Venezuela, t...

  7. Nuevas tecnologías y relaciones laborales

    OpenAIRE

    Cuadros Garrido, María Elisa

    2017-01-01

    La Memoria de Doctorado ofrece una visión actualizada sobre la incidencia de las nuevas tecnologías en las relaciones laborales, su falta de regulación legal específica determina que estemos ante un Derecho de creación jurisprudencial y que la irradiación constitucional sea más fuerte que en otros ámbitos, por lo que el papel del Tribunal Constitucional es determinante en este ámbito. Aun así, se puede afirmar que el terreno es “movedizo”, pues existen, en ocasiones, cambios de doctrina cuest...

  8. La escuela y las nuevas formas de convivencia

    OpenAIRE

    Miguel Ángel Estrada

    2016-01-01

    Actualmente, en las escuelas aumenta la reproducción de dinámicas de convivencia negativas, las cuales están siendo consideradas como nuevas, aunque siempre han estado presentes, esto se debe a que se trata de un tema que recientemente retomó importancia. Dentro de las principales manifestaciones se encuentra el acoso escolar, en todas sus modalidades: mobbing, bullying, acoso del docente al alumno y acoso del alumno al docente. Algunos de los detonantes del citado fenómeno son el ambiente y ...

  9. Sertula Florae Colombiae – XV: Nuevas Melastomatáceas

    Directory of Open Access Journals (Sweden)

    Uribe Uribe Lorenzo

    1980-09-01

    Full Text Available El notable aumento de las colecciones del Herbario Nacional Colombiano muestran la riqueza de la flora melastomatácea de Colombia. Uno de los géneros más ricos y más bien caracterizados es Blakea. En este artículo describo dos nuevas especies muy interesantes. Dejo consignada mi gratitud para elnotable dibujante, don Silvio Fernández Valencia, a quien se deben las magníficas ilustraciones y muchos datos y mediciones de órganos pequeñísimos, que facilitaron  las descripciones exactas de las plantas.

  10. Nuevas formas de interactividad en videojuegos: los cascos EEG

    OpenAIRE

    Aniorte Llanes, Carlos

    2017-01-01

    Los videojuegos actuales cada vez nos ofrecen más formas y más variadas de interaccionar con ellos. La exploración de nuevos medios de interactividad en videojuegos amplia las perspectivas de juego y su aplicación. Por ello, este trabajo propone investigar estas nuevas formas de obtener entradas para la interacción, en concreto, las posibilidades de controlar los juegos mediante las ondas cerebrales. El público de este videojuego se centraría en personas que tienen un estado cognitivo normal,...

  11. Nuevos medios de comunicación, nuevas militancias

    Directory of Open Access Journals (Sweden)

    Eduardo Andrés Vizer

    2014-12-01

    Full Text Available Las nuevas tecnologías han quebrantado las barreras del tiempo y espacio, introduciendo el pasado y el futuro en las ecuaciones de un presente perpetuo. Con el crecimiento de Internet el periodismo de opinión crece en forma exponencial. Cada ciudadano puede constituirse en un militante público en circunstancias apropiadas. Indica que el periodismo 3.0 se sustenta en la consolidación de la llamada Web 2.0 que es la capacidad de aprovechar la inteligencia colectiva.

  12. Nuevas relaciones laborales en la industria automotriz colombiana

    OpenAIRE

    Edgar Augusto Valero

    2004-01-01

    Los sectores de ensamble de autos y fabricación de autopartes en Colombia describen las presiones que ejerce el entorno competitivo internacional sobre la eficiencia y la calidad. Estas presiones han incidido en la adopción de nuevas formas de organización del trabajo y en el cambio casi generalizado de políticas de personal durante los últimos quince años. En este artículo se analiza e ilustra un conjunto de transformaciones significativas en las relaciones laborales en esta rama industrial,...

  13. Strong motion duration and earthquake magnitude relationships

    International Nuclear Information System (INIS)

    Salmon, M.W.; Short, S.A.; Kennedy, R.P.

    1992-06-01

    Earthquake duration is the total time of ground shaking from the arrival of seismic waves until the return to ambient conditions. Much of this time is at relatively low shaking levels which have little effect on seismic structural response and on earthquake damage potential. As a result, a parameter termed ''strong motion duration'' has been defined by a number of investigators to be used for the purpose of evaluating seismic response and assessing the potential for structural damage due to earthquakes. This report presents methods for determining strong motion duration and a time history envelope function appropriate for various evaluation purposes, for earthquake magnitude and distance, and for site soil properties. There are numerous definitions of strong motion duration. For most of these definitions, empirical studies have been completed which relate duration to earthquake magnitude and distance and to site soil properties. Each of these definitions recognizes that only the portion of an earthquake record which has sufficiently high acceleration amplitude, energy content, or some other parameters significantly affects seismic response. Studies have been performed which indicate that the portion of an earthquake record in which the power (average rate of energy input) is maximum correlates most closely with potential damage to stiff nuclear power plant structures. Hence, this report will concentrate on energy based strong motion duration definitions

  14. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative magnitudes ICRU, for external fields of beta radiation. Part I. Study of the homogeneity of the response personal dosemeters leaves (cards G-1, TLD-100), in radiation fields of Co60

    International Nuclear Information System (INIS)

    Alvarez R, J.T.

    1994-01-01

    A sample of 40 composed personal dosemeters by cards model: G-l, (each card is made up of two TLD-100 crystals encapsulated in teflon), Harshaw trademark; those personal dosemeters present a free window and another with a filter of A1 of 171.7 mg cm -2 of mass thickness.The objective of the work is to select of this sample of 40 personal dosemeters a population with the same stocking and standard deviation. The technique used is that of comparison of stockings, (ANOVA; Variance Analysis, when samples of the same one were had size; and/or GLM, Widespread Lineal Models, when the samples were of different size), by means of the use of those Duncan statistics, SNK, Tukey, Gabriel; the results are validated proving the kindness of adjustment of the experimental data to a Normal distribution by means of the Shapiro-Wilks statistics.The experimental design used consists on a test of two vias: a via is the variable card with two levels, (crystal 1 and 2), the other via is the variable irradiation position with four levels, (LS=left superior, SR= right superior, LI= left Inferior, IR = right inferior). The irradiations carried out in blocks of four personal dosemeters in a gamma radiation beam range of Cobalt 60; carrying out three repetitions of the design. With object of proving the homogeneity of the filter of A1 in those personal dosemeters the experimental design was executed for those cards without personal dosemeters.They were also carried out tests of stockings to the readings of bottom and sensibility of the reader equipment, (Harshaw, model marks 2271), certain that doesn t exist differences for sequence of reading, but if in the stockings of the sensibility, (they were 4 different populations). The responses of the dosemeters were corrected subtracting him the reading correspondence of bottom and by sensibility of the reader equipment before subjecting them to the tests of stockings mentioned. Of the results of the tests of stockings for the cards with and

  15. Una nueva especie amazónica de Aristolochia (Aristolochiaceae Una nueva especie amazónica de Aristolochia (Aristolochiaceae

    Directory of Open Access Journals (Sweden)

    González Favio

    1991-12-01

    Full Text Available Mediante el estudio de colecciones provenientes de la Amazonia ecuatoriana (Napo y peruana (Huánuco y Loreto, es descrita Aristolochia schunkeana como especie nueva de Aristolochia ser. Thyrsicae; adicionalmente, se presenta una clave ilustrada para diferenciar las especies de la Amazonia noroccidental afines al nuevo taxon. Aristolochia schunkeana, from Ecuador (Napa and Peru (Huánuco and Loreto, is described as a new species of Aristolochia ser. Thyrsicae; in addition, a key and some drawings of the new taxon and their relatives from northwest Amazonia are provided.

  16. Nueva Secularización, Nueva Subjetividad: El descentramiento del trabajo y de la política

    Directory of Open Access Journals (Sweden)

    Martín Hopenhayn

    2000-01-01

    Full Text Available La secularización moderna surge de la Ilustración y contra la idea de un sujeto atrapado en un mundo de mitos, fantasmas y prescripciones doctrinarias y autoridades religiosas. Nuevas categorías del sujeto, construídas por la razón y la ciencia, inducen a pensar que ahora podremos vernos a nosotros mismos tal cual somos y, en la misma medida, realizar nuestros anhelados proyectos de libertad, progreso y cultura laica.

  17. Nueva Área Terminal (NAT del aeropuerto de Madrid-Barajas T-4

    Directory of Open Access Journals (Sweden)

    Lamela, A.

    2006-03-01

    Full Text Available This paper deals with the New Terminal Area of the Barajas airport. Its first part indicates the participants in the design and construction, as well as some general data. In the second part, organised like a data chart, technical data, such as general information, construction aspects, parking area, data about the building itself and others, are expressed in a concise way. The third part analyzes the construction aspects of the NAT Building, related to the power efficiency. The paper ends with a note that the author of the project has considered of interest about the functionality of the T4. Drawings, details and photographs that show the work in their total magnitude are also included.El articulo que se presenta trata de la Nueva Área Terminal (NAT del aeropuerto de Barajas y está diferenciado en una primera parte, donde se indican los créditos del proyecto y de la construcción, así como algunos datos generales. En el punto 2 y organizado como ficha, aparecen de forma escueta los datos técnicos, tales como: información general, sobre la construcción, sobre los aparcamientos, sobre el edificio terminal y otras. En el punto 3 se analizan los aspectos de la edificación NAT, relacionados con la eficiencia energética y finaliza el artículo con una nota sobre la funcionalidad de la T4, que el autor del proyecto ha considerado de interés. Se incluyen planos detalles y fotografías que muestran la obra en su total magnitud.

  18. Familia, socialización y nueva paternidad

    Directory of Open Access Journals (Sweden)

    Nora Cebotarev

    2003-01-01

    Full Text Available El objetivo de este artículo es ilustrar el carácter construido, flexible y multiforme de estructuras y procesos intergeneracionales de la familia utilizando como ejemplo su evolución histórica en los EEUU, y compartir resultados de investigaciones y nuevas conceptualizaciones de cambios recientes, para contribuir a una mejor comprensión del impacto del proceso de socialización intrafamiliar sobre la formación de futuras generaciones. El artículo contiene 5 partes que cubren los siguientes temas: la familia y su complejidad, concepciones diversas y transformación histórica de la familia; la modificación de roles e identidades de género y la nueva paternidad; la parentalidad, sus tareas durante la adolescencia, considerando el desarrollo cognitivo, la emotividad y cambios de autoconceptos del adolescente y la adolescente, y el manejo de conflictos familiares; los efectos de estilos parentales, (desde el control rígido hasta la inducción y democracia; la calidez y aceptación, la entrega de información, las conductas limitantes y capacitadoras, la conectividad; y la importancia de los cambios contextuales. Concluye el artículo preguntando: hasta qué punto pueden estos conocimientos ayudar a las familias en América Latina a crear una sociedad más pacífica y justa?

  19. Familia, socialización y nueva paternidad

    Directory of Open Access Journals (Sweden)

    Nora Cebotarev

    2003-10-01

    Full Text Available El objetivo de este artículo es ilustrar el carácter construido, flexible y multiforme de estructuras y procesos intergeneracionales de la familia utilizando como ejemplo su evolución histórica en los EEUU, y compartir resultados de investigaciones y nuevas conceptualizaciones de cambios recientes, para contribuir a una mejor comprensión del impacto del proceso de socialización intrafamiliar sobre la formación de futuras generaciones. El artículo contiene 5 partes que cubren los siguientes temas: la familia y su complejidad, concepciones diversas y transformación histórica de la familia; la modificación de roles e identidades de género y la nueva paternidad; la parentalidad, sus tareas durante la adolescencia, considerando el desarrollo cognitivo, la emotividad y cambios de autoconceptos del adolescente y la adolescente, y el manejo de conflictos familiares; los efectos de estilos parentales, (desde el control rígido hasta la inducción y democracia; la calidez y aceptación, la entrega de información, las conductas limitantes y capacitadoras, la conectividad; y la importancia de los cambios contextuales. Concluye el artículo preguntando: hasta qué punto pueden estos conocimientos ayudar a las familias en América Latina a crear una sociedad más pacífica y justa?

  20. Sequential dependencies in magnitude scaling of loudness

    DEFF Research Database (Denmark)

    Joshi, Suyash Narendra; Jesteadt, Walt

    2013-01-01

    Ten normally hearing listeners used a programmable sone-potentiometer knob to adjust the level of a 1000-Hz sinusoid to match the loudness of numbers presented to them in a magnitude production task. Three different power-law exponents (0.15, 0.30, and 0.60) and a log-law with equal steps in d......B were used to program the sone-potentiometer. The knob settings systematically influenced the form of the loudness function. Time series analysis was used to assess the sequential dependencies in the data, which increased with increasing exponent and were greatest for the log-law. It would be possible......, therefore, to choose knob properties that minimized these dependencies. When the sequential dependencies were removed from the data, the slope of the loudness functions did not change, but the variability decreased. Sequential dependencies were only present when the level of the tone on the previous trial...

  1. Erratum: Sloan Magnitudes for the Brightest Stars

    Science.gov (United States)

    Mallama, A.

    2018-06-01

    In the article "Sloan Magnitudes for the Brightest Stars" (JAAVSO, 2014, 42, 443), Equation 3 in section A.1. of the Appendix is incorrect; the coefficient of ((R-I) - C1) should be 0.935, rather than 0.953. The mean differences between the new and old results are 0.00 in all cases, and the standard deviations are all 0.00 or 0.01, which is less than the photometric uncertainties of the Johnson or Sloan values. A revised version of the catalog has been published at https://arxiv.org/abs/1805.09324. The revision is proposed as a bright star extension to the APASS database.

  2. Violence against women: global scope and magnitude.

    Science.gov (United States)

    Watts, Charlotte; Zimmerman, Cathy

    2002-04-06

    An increasing amount of research is beginning to offer a global overview of the extent of violence against women. In this paper we discuss the magnitude of some of the most common and most severe forms of violence against women: intimate partner violence; sexual abuse by non-intimate partners; trafficking, forced prostitution, exploitation of labour, and debt bondage of women and girls; physical and sexual violence against prostitutes; sex selective abortion, female infanticide, and the deliberate neglect of girls; and rape in war. There are many potential perpetrators, including spouses and partners, parents, other family members, neighbours, and men in positions of power or influence. Most forms of violence are not unique incidents but are ongoing, and can even continue for decades. Because of the sensitivity of the subject, violence is almost universally under-reported. Nevertheless, the prevalence of such violence suggests that globally, millions of women are experiencing violence or living with its consequences.

  3. Evidence accumulation in the magnitude system.

    Directory of Open Access Journals (Sweden)

    Anna Lambrechts

    Full Text Available Perceptual interferences in the estimation of quantities (time, space and numbers have been interpreted as evidence for a common magnitude system. However, if duration estimation has appears sensitive to spatial and numerical interferences, space and number estimation tend to be resilient to temporal manipulations. These observations question the relative contribution of each quantity in the elaboration of a representation in a common mental metric. Here, we elaborated a task in which perceptual evidence accumulated over time for all tested quantities (space, time and number in order to match the natural requirement for building a duration percept. For this, we used a bisection task. Experimental trials consisted of dynamic dots of different sizes appearing progressively on the screen. Participants were asked to judge the duration, the cumulative surface or the number of dots in the display while the two non-target dimensions varied independently. In a prospective experiment, participants were informed before the trial which dimension was the target; in a retrospective experiment, participants had to attend to all dimensions and were informed only after a given trial which dimension was the target. Surprisingly, we found that duration was resilient to spatial and numerical interferences whereas space and number estimation were affected by time. Specifically, and counter-intuitively, results revealed that longer durations lead to smaller number and space estimates whether participants knew before (prospectively or after (retrospectively a given trial which quantity they had to estimate. Altogether, our results support a magnitude system in which perceptual evidence for time, space and numbers integrate following Bayesian cue-combination rules.

  4. Descripción de una nueva especie del género Agrotis (Lepidoptera: Noctuidae

    Directory of Open Access Journals (Sweden)

    SAN BLAS Germán

    2011-01-01

    Full Text Available Se describe e ilustra una nueva especie de Noctuidae: Agrotis leucovenata sp. nov. Esta se distribuye en la estepa patagónica de la provincia de Neuquén, en Argentina. Se discuten los caracteres propios de la nueva especie, que la diferencian de otras especies similares del género.

  5. Fast Moment Magnitude Determination from P-wave Trains for Bucharest Rapid Early Warning System (BREWS)

    Science.gov (United States)

    Lizurek, Grzegorz; Marmureanu, Alexandru; Wiszniowski, Jan

    2017-03-01

    Bucharest, with a population of approximately 2 million people, has suffered damage from earthquakes in the Vrancea seismic zone, which is located about 170 km from Bucharest, at a depth of 80-200 km. Consequently, an earthquake early warning system (Bucharest Rapid earthquake Early Warning System or BREWS) was constructed to provide some warning about impending shaking from large earthquakes in the Vrancea zone. In order to provide quick estimates of magnitude, seismic moment was first determined from P-waves and then a moment magnitude was determined from the moment. However, this magnitude may not be consistent with previous estimates of magnitude from the Romanian Seismic Network. This paper introduces the algorithm using P-wave spectral levels and compares them with catalog estimates. The testing procedure used waveforms from about 90 events with catalog magnitudes from 3.5 to 5.4. Corrections to the P-wave determined magnitudes according to dominant intermediate depth events mechanism were tested for November 22, 2014, M5.6 and October 17, M6 events. The corrections worked well, but unveiled overestimation of the average magnitude result of about 0.2 magnitude unit in the case of shallow depth event ( H < 60 km). The P-wave spectral approach allows for the relatively fast estimates of magnitude for use in BREWS. The average correction taking into account the most common focal mechanism for radiation pattern coefficient may lead to overestimation of the magnitude for shallow events of about 0.2 magnitude unit. However, in case of events of intermediate depth of M6 the resulting M w is underestimated at about 0.1-0.2. We conclude that our P-wave spectral approach is sufficiently robust for the needs of BREWS for both shallow and intermediate depth events.

  6. Estudio de las cualidades inmunoestimulantes de nuevas bacterias probióticas asociadas al cultivo de lv

    OpenAIRE

    Gullian, Mariel; Rodríguez, Jenny

    2002-01-01

    Estudio de las cualidades inmunoestimulantes de nuevas bacterias probióticas asociadas al cultivo de LV Estudio de las cualidades inmunoestimulantes de nuevas bacterias probióticas asociadas al cultivo de LV

  7. TEORÍA Y PRÁCTICA DE LOPE Y MORATÍN: LA NUEVA COMEDIA, 'LA COMEDIA NUEVA'

    Directory of Open Access Journals (Sweden)

    Elia Saneleuterio Temporal

    2014-10-01

    Full Text Available En este artículo, por primera vez, se ponen en relación las teorías teatrales de dos dramaturgos españoles que crearon escuela: Lope de Vega y Leandro Fernández de Moratín. Dos siglos separan sus creaciones, pero ambos pretendieron renovar la escena con sus poéticas, ambos pretendieron una «nueva comedia» que rompiera con las tradiciones teatrales inmediatamente anteriores. Las obras dramáticas de uno y otro autor, en realidad se sitúan en polos opuestos en cuanto a su extensión; la de Lope abarca más de cuatrocientos títulos, mientras que Moratín apenas tiene en su haber media decena de piezas. El más fecundo e internacional poeta dramático español y el más comedido de entre los dramaturgos de amplio reconocimiento tienen en común una peculiar pretensión de reflejar con sus obras la realidad del mundo. Parafraseando al propio Lope, comoedia speculum humanae vitae podría utilizarse como lema de ambos. Partiendo del Arte nuevo de hacer comedias (1609 y La comedia nueva o el café (1792 desentrañamos la realidad teatral de ambos autores, contextualizándolas en sus respectivos momentos históricos.

  8. Nuevas especies, nombres nuevamente utilizados y nuevas distribuciones en los helechos arborescentes (Filicales: Cyatheaceae para el Neotrópico

    Directory of Open Access Journals (Sweden)

    Alexander Fco. Rojas - Alvarado

    2001-06-01

    Full Text Available Dos especies nuevas son descritas para el Neotrópico, cuatro especies anteriormente sinonimizadas son reconocidas, y se amplián la distribución de cuatro especies y una variedad. Las nuevas especies son: Cyathea grayumii A. Rojas y C. panamensis A. Rojas. Cyathea alfonsiana L. D. Gómez, C. holdridgeana Nisman et L. D. Gómez, C. onusta H. Christ y C. squarrosa (Rosenst. Domin son nuevamente aceptadas, y Cnemidaria coclena Stolze, Cyathea andina (Karst. Domin, C. caracasana var. meridensis (H. Karst. R. M. Tryon, C. macrosora y C. pseudonanna (L. D. Gómez Lellinger son ampliadas en su distribución.Two new species are described for the Neotropic, four species are newly accepted, and four species and one variety are reported. The new species are: Cyathea grayumii A. Rojas and C. panamensis A. Rojas. Cyathea alfonsiana L. D. Gómez, C. holdridgeana Nisman & L. D. Gómez, C. onusta H. Christ and C. squarrosa (Rosenst. Domin are recognized; Cnemidaria coclena Stolze, Cyathea andina (H. Karst. Domin, C. caracasana var. meridensis (H. Karst. R. M. Tryon, C. macrosora (Baker Domin and C. pseudonanna (L. D. Gómez Lellinger are reported from Costa Rica and Panama.

  9. Child prostitution: magnitude and related problems.

    Science.gov (United States)

    Ayalew, T; Berhane, Y

    2000-07-01

    In Ethiopia, very little is known about prostitution in general and about child prostitution in particular. The objective of this study was to determine the magnitude of child prostitution and to identify problems associated with it. A cross-sectional study design was utilized. Data were collected using structured questionnaire. A total of 650 commercial sex workers were interviewed. Eighty eight (13.5%) were below the age of 18 years at the time of data collection. At the time of joining prostitution 268 (41.2%) were under 18 years of age. Poverty, disagreement with family, and peer influence were the major reasons leading to prostitution. Child prostitutes were likely to be victim of physical violence [OR = (95% C.I.) = 1.93(1.18,3.15)] and sexual violence [OR = (95% C.I.) = 2.20(1.36,3.35)] compared to adult prostitutes. Child prostitutes were about five times more likely to desire rejoining their family than the adult prostitutes [OR = (95% C.I) = 5.47(3.01;9.93)]. Strategies need to be developed to rescue child prostitutes from on-job violence, and to establish a rehabilitation program for those interested to discontinue prostitution along with efforts to minimize entry into prostitution.

  10. Childhood Cataract: Magnitude, Management, Economics and Impact

    Directory of Open Access Journals (Sweden)

    BR Shamanna

    2004-01-01

    Full Text Available The prevalence of blindness among children in different regions varies from 0.2/1000 children to over 1.5/1000 children with a global figure estimated at 0.7/1000. This means that there are an estimated 1.4 million blind children worldwide.1 The proportion of blindness in children due to cataract varies considerably between regions from 10%-30% with a global average estimated at 14%, giving 190,000 children blind from cataract. 2 While the magnitude of childhood cataracts varies from place to place, it is a priority within all blindness control programmes for children. Children who are blind have to overcome a lifetime of emotional, social and economic difficulties which affect the child, the family and society.3 Loss of vision in children influences their education, employment and social life. The numbers blind with cataract do not reflect the years of disability and lost quality of life. Childhood blindness is second only to adult cataract as a cause of blind-person years. Approximately 70 million blind-person years are caused by childhood blindness of which about 10 million blind-person years (14% is due to childhood cataract. Timely recognition and intervention can eliminate blind-years due to childhood cataract, as the condition is treatable.

  11. How fault geometry controls earthquake magnitude

    Science.gov (United States)

    Bletery, Q.; Thomas, A.; Karlstrom, L.; Rempel, A. W.; Sladen, A.; De Barros, L.

    2016-12-01

    Recent large megathrust earthquakes, such as the Mw9.3 Sumatra-Andaman earthquake in 2004 and the Mw9.0 Tohoku-Oki earthquake in 2011, astonished the scientific community. The first event occurred in a relatively low-convergence-rate subduction zone where events of its size were unexpected. The second event involved 60 m of shallow slip in a region thought to be aseismicaly creeping and hence incapable of hosting very large magnitude earthquakes. These earthquakes highlight gaps in our understanding of mega-earthquake rupture processes and the factors controlling their global distribution. Here we show that gradients in dip angle exert a primary control on mega-earthquake occurrence. We calculate the curvature along the major subduction zones of the world and show that past mega-earthquakes occurred on flat (low-curvature) interfaces. A simplified analytic model demonstrates that shear strength heterogeneity increases with curvature. Stress loading on flat megathrusts is more homogeneous and hence more likely to be released simultaneously over large areas than on highly-curved faults. Therefore, the absence of asperities on large faults might counter-intuitively be a source of higher hazard.

  12. Local magnitude, duration magnitude and seismic moment of Dahshour 1992 earthquakes

    Energy Technology Data Exchange (ETDEWEB)

    Dessokey, M.M.; Abdelwahed, M.F. [National research Institute of Astronomy and Geophysics, Cairo (Egypt). Dept. of Seismology; Hussein, H.M.; Abdelrahman, El. M. [Cairo Univ., Cairo (Egypt). Dept. of Geophysics

    2000-02-01

    Local magnitude M{sub L} have been calculated for 56 earthquakes of the Dahshour 1992 sequence using simulated records of the KEG broadband station and estimated calibration function of the area. The measurements, derived by the simulated Wood Anderson seismograms, are analysed and discussed.

  13. Bhimrao R. Ambedkar: el nacimiento de una nueva conciencia dalit

    Directory of Open Access Journals (Sweden)

    Agustín Pániker

    2014-04-01

    Full Text Available Un repaso a la vida y el legado de Bhimrao Ambedkar, el político más influyente del siglo XX en la lucha por la emancipación de los intocables de la India. Él mismo de origen dalit, fue el artífice de la Constitución de la India, líder de diversas formaciones políticas y quien sentó las bases de las modernas políticas de acción afirmativa del país. Especial énfasis se pone en la manera cómo Ambedkar dotó de una nueva conciencia e identidad (budista a muchos dalits de Maharashtra.

  14. La nueva guerra de los 100 años

    Directory of Open Access Journals (Sweden)

    Bruce M. Bagley

    2015-01-01

    Full Text Available Desinformación guerra o conflicto de baja intensidad, operaciones sicológicas, droga narcotráfico tienen un solo denominador: la violencia. Este número presenta los resultados de una investigación periodística sobre desinformación. Otro tema que se aborda es el de la comunicación y las drogas, pues varios periodistas son asesinados o acobardados cuando los enfrentan y los medios de comunicación cada vez son más utilizados para propagar sus acciones. Se agrega temas relativos a una nueva etapa de la televisión,se trata sobre la carrera de comunicación

  15. Nanoinsecticidas: Nuevas perspectivas para el control de plagas

    Directory of Open Access Journals (Sweden)

    Teodoro STADLER

    2010-01-01

    Full Text Available La agricultura de bajo impacto ambiental demanda nuevos pesticidas que deben ajustarse a las exigentes normativas internacionales. Parte de la búsqueda de nuevos productos bio-racionales se desarrolla por fuera del marco de la síntesis orgánica, explorando diferentes sustancias de origen natural como extractos vegetales, aceites insecticidas e insecticidas inorgánicos. Los polvos insecticidas representan el grupo más antiguo de sustancias utilizadas por el hombre para el control de plagas, cuya eficacia se basa principalmente en fenómenos físicos. Con el advenimiento de los insecticidas de síntesis, los polvos insecticidas fueron relegados por casi cinco décadas a la función de carriers de principios activos dentro de los insecticidas formulados. Con el desarrollo del caolín hidrófobo en la década de los 90 ́, los polvos inorgánicos resurgieron como insecticidas “per se”, y, recientemente, a partir del descubrimiento de los nanoinsecticidas, afloran nuevas alternativas para expandir el espectro de aplicaciones de los polvos inorgánicos. El desarrollo y registro de nuevos productos a partir de nanomateriales manufacturados se basa en el paradigma “lo mismo pero diferente”, ya que éstos difieren de las sustancias con idéntica estructura y composición química respecto de algunas propiedades como reactividad, área especifica, efectos cuánticos, carga eléctrica, etc. Estas sustancias con nuevas propiedades también se destacan como herramientas muy prometedoras para la protección de cultivos y la producción de alimentos y abren nuevas fronteras para el manejo de plagas con nanoinsecticidas. La alúmina nanoestructurada exhibe varias de las propiedades del insecticida ideal, ya que se trata de un producto natural desde el punto de vista químico, no reactivo, económico, con reducidas probabilidades de provocar resistencia en los insectos y su eficacia es mayor que la de otros polvos insecticidas como el caolín o la

  16. El territorio de las nuevas economías metropolitanas

    Directory of Open Access Journals (Sweden)

    Ricardo Méndez

    2007-12-01

    Full Text Available Las transformaciones económicas recientes ocurridas en las regiones metropolitanas suponen importantes cambios en las pautas de localizado n de las empresas, el dinamismo y la organización espacial de las diferentes actividades, empleos y funciones, con evidentes efectos sobre la forma urbana. Un diagnóstico sobre la nueva geografía económica de las ciudades mundiales y sus regiones metropolitanas es un factor clave para orientar las nuevas políticas de promoción económica y planeamiento urbanístico. El artículo propone una revisión crítica de diferentes conceptos y teorías sobre la actual relación entre economías y territorios metropolitanos, analiza las tendencias recientes en la organización espacial de las actividades y destaca la importancia de las respuestas locales en la construcción de ciudades competitivas e innovadorasThe recent economic changes in metropolitan regions have given rise to significant shifis in the locational strategies of firms, the spatial organisation of different activities, functions and jobs, with direct consequences for urban form. A diagnosis of the new economic geography of world cities and metropolitan regions is a key factor in shaping new economic promotion policies and urban planning. This paper offers a critical review of diverse concepts and theories relating to the recent territorial evolution of metropolitan economies, it analyses the recent trends in spatial organisation of activities, and it emphasises the strategic value of local responses in the construction of competitive and innovative cities

  17. Monopolios, aranceles y contrabando en Nueva Granada, 1821-1830

    Directory of Open Access Journals (Sweden)

    Muriel Laurent

    2011-06-01

    Full Text Available Este artículo estudia el contrabando en Nueva Granada durante la primera década postindependentista. En un contexto en el que la reglamentación aduanera y comercial continuaba siendo proteccionista y fiscalista, a pesar de la pertinencia cada vez más aceptada de los argumentos a favor del libre cambio, se examina el comportamiento del comercio ilícito. El objetivo consiste en determinar cuál fue la relación entre esta reglamentación y el contrabando y en evaluar si la tendencia que considera que a mayor prohibición o mayor gravamen mayor contrabando se verifica en Nueva Granada entre 1821 y 1830; asimismo, en caso de verificarse, establecer si el contrabando recayó más en los productos prohibidos o en los más gravados.This article studies contraband in New Granada during the first decade after Independence. Given that the regulation of customs and trade remained protectionist and fiscally oriented, despite the growing acceptance of arguments in favor of free trade, it examines what happened to this illicit trade. The article tries to determine the relationship between these regulations and contraband. It also evaluates whether the frequently-held assumption that increasing prohibition or taxes on trade leads to a rise in contraband holds true for Colombia. If it does hold true, the article also attempts to establish whether or not there was greater contraband in prohibited or highly-taxes products.

  18. UNA NUEVA ESPECIE DE ACANTHOCLADUS (POLYGALACEAE DE COLOMBIA

    Directory of Open Access Journals (Sweden)

    Aymard Gerardo Felipe

    2009-06-01

    Full Text Available Una nueva especie del género Acanthocladus Klotzsch ex Hassk. se encontró durante la elaboración del tratamiento de la familia Polygalaceae para el Catálogo de las Plantasde Colombia. Se describe e ilustra Acanthocladus colombianus de los valles áridos interandinos ubicados en la Cordillera Oriental, departamento de Cundinamarca, y sediscuten sus relaciones morfológicas con su especie afín. Acanthocladus colombianus es similar a A. guayaquilensis B. Eriksen & Ståhl, sin embargo, difi ere de esta especiepor ser un árbol de 15 m de altura, con las ramitas teretes, las hojas más grandes, rígido-coriáceas, con 6--9 venas laterales, infl orescencias sésiles, y los sépalos externospilosos, 3--4 x 3--4 mm. Esta nueva especie representa el primer registro del géneropara los Andes. The phylogenetic relationship of the species of the genus Auricularia and its allied taxa were investigated using the internal transcribed spacer (ITS sequences of nuclear DNA. A molecular phylogenetic tree constructed using a total of 17 samples representing fi ve species and two outgroups indicates that the species of Auricularia form a monophyletic group. Within the genus Auricularia, A. mesenterica is basal and the remaining Auricularia species form three clades; the fi rst clade consists of A. auricula-judae; the second, of A. fuscosuccinea; and the third, of A. polytricha.

  19. Ciudades nuevas sostenibles en las regiones del Caribe y Orinoquia

    Directory of Open Access Journals (Sweden)

    Julio Carrizosa Umaña

    2009-11-01

    Full Text Available Se propone una política regional de construcción de nuevas ciudades para lograr un uso más racional de la energía, el agua y los suelos, disminuir la presión poblacional sobre las ciudades grandes, disminuir los costos de la descontaminación de los ambientes urbanos y mitigar los impactos de la población urbana sobre los ecosistemas. Se anotan los obstáculos geográficos, históricos, sociales y económicos en el proceso de manejo de la contaminación urbana, se detalla la situación actual ambiental de la capital de Colombia. Se explica cuál es el papel de la ingeniería en la sostenibilidad de las ciudades y se recomienda una política de planificación y construcción de nuevas ciudades en las regiones del Caribe y de la Orinoquia. /A regional policy of new towns development is proposed in order to obtain a better quality of life, a more rational use of energy, water and soil resources and alleviation of population pressure in the large cities, lower costs of contamination management and mitigation of impacts of urban population on ecosystems. Geographic, historic, social and economic obstacles in contamination management are noted and the case of the capital is analyzed. Engineering roles in obtaining sustainable cities are outlined. Priority in the development of new towns in the Caribe and Orinoquia is recommended.

  20. Evaluation of the ICRU operational magnitudes implantation for the photon radiation at the Angra I and Angra II nuclear power plants; Avaliacao da implantacao das grandezas operacionais do ICRU para a radiacao de fotons nas usinas nucleares Angra I e II

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Ronaldo do Nascimento

    2006-07-01

    The measurements of photon radiation field intensity are usually performed by a radiation protection technician trained and having skill in using radiation rate meters. Nowadays, these measurements are reported on exposure quantity and used to protect exposed individuals against the radiation risks while executing their activities. The International Commission on Radiation Units and Measurements - ICRU - defined the operational quantity ambient equivalent dose H{sup *}(10). This quantity is accepted by the scientific community as the best estimative of the protection quantity effective dose, which can not be directly measured. The operational quantity H{sup *}(10) was introduced in Brazilian rules by the National Commission of Nuclear Energy - CNEN (2005a), although its adoption was conditioned to studies of convenience and applicability of implementation. The present work may contribute to these studies, as it presents the evaluation of H{sup *}(10)'s implementation at the Nuclear Central Almirante Alvaro Alberto - CNAAA. The evaluation involved radiological tests - the energy dependence and angular dependence - applied to six types of photon radiation rate meters utilized at the CNAAA, with represent around 83% of the total number of rate meters in use by CNAAA. The result of this evaluation is favorable to the quantity H{sup *}(10)'s implementation. Suggestions are presented in order to update de rate meters and the technical and administrative procedures related to the Laboratory of Calibration of Rate Meters - LCMR, belonging to CNAAA. Thus, it could be possible to perform the calibration of the rate meters at the nuclear installation. The results obtained allows to carry out new evaluations of H{sup *}(10)'s implementation on installations that perform measurements with radiation rate meters on the practice of radiation protection, in order to adopt the H{sup *}(10) quantity in our country. (author)

  1. Automatic computation of moment magnitudes for small earthquakes and the scaling of local to moment magnitude

    Science.gov (United States)

    Edwards, Benjamin; Allmann, Bettina; Fäh, Donat; Clinton, John

    2010-10-01

    Moment magnitudes (MW) are computed for small and moderate earthquakes using a spectral fitting method. 40 of the resulting values are compared with those from broadband moment tensor solutions and found to match with negligible offset and scatter for available MW values of between 2.8 and 5.0. Using the presented method, MW are computed for 679 earthquakes in Switzerland with a minimum ML = 1.3. A combined bootstrap and orthogonal L1 minimization is then used to produce a scaling relation between ML and MW. The scaling relation has a polynomial form and is shown to reduce the dependence of the predicted MW residual on magnitude relative to an existing linear scaling relation. The computation of MW using the presented spectral technique is fully automated at the Swiss Seismological Service, providing real-time solutions within 10 minutes of an event through a web-based XML database. The scaling between ML and MW is explored using synthetic data computed with a stochastic simulation method. It is shown that the scaling relation can be explained by the interaction of attenuation, the stress-drop and the Wood-Anderson filter. For instance, it is shown that the stress-drop controls the saturation of the ML scale, with low-stress drops (e.g. 0.1-1.0 MPa) leading to saturation at magnitudes as low as ML = 4.

  2. Moment Magnitude ( M W) and Local Magnitude ( M L) Relationship for Earthquakes in Northeast India

    Science.gov (United States)

    Baruah, Santanu; Baruah, Saurabh; Bora, P. K.; Duarah, R.; Kalita, Aditya; Biswas, Rajib; Gogoi, N.; Kayal, J. R.

    2012-11-01

    An attempt has been made to examine an empirical relationship between moment magnitude ( M W) and local magnitude ( M L) for the earthquakes in the northeast Indian region. Some 364 earthquakes that were recorded during 1950-2009 are used in this study. Focal mechanism solutions of these earthquakes include 189 Harvard-CMT solutions ( M W ≥ 4.0) for the period 1976-2009, 61 published solutions and 114 solutions obtained for the local earthquakes (2.0 ≤ M L ≤ 5.0) recorded by a 27-station permanent broadband network during 2001-2009 in the region. The M W- M L relationships in seven selected zones of the region are determined by linear regression analysis. A significant variation in the M W- M L relationship and its zone specific dependence are reported here. It is found that M W is equivalent to M L with an average uncertainty of about 0.13 magnitude units. A single relationship is, however, not adequate to scale the entire northeast Indian region because of heterogeneous geologic and geotectonic environments where earthquakes occur due to collisions, subduction and complex intra-plate tectonics.

  3. Nueva Galicia en las relaciones geográficas de Felipe II: aspectos urbanos

    OpenAIRE

    López Guzmán, Rafael

    2008-01-01

    extraer la información de carácter urbanístico contenida en las mismas y referida a lo que fue el territorio de la Audiencia de la Nueva Galicia entre 1575 y 1585, aproximadamente. Su especial situación en la frontera norte del virreinato de la Nueva España hizo que la ocupación con nuevas poblaciones estuviera condicionada por la presencia de indios chichimecas y, a nivel económico, por el descubrimiento de minas. El trabajo se basa en las 12 Relaciones conservadas en la actualid...

  4. Temporal and spatial variations in the magnitude of completeness ...

    Indian Academy of Sciences (India)

    Temporal and spatial variations in the magnitude of completeness for homogenized moment magnitude catalogue for northeast India. Ranjit Das H R ... Orthogonal regression relations for conversion of body and surface wave magnitudes to w,HRVD based on events data for the period 1978–2006 have been derived.

  5. Automatic computation of moment magnitudes for small earthquakes and the scaling of local to moment magnitude

    OpenAIRE

    Edwards, Benjamin; Allmann, Bettina; Fäh, Donat; Clinton, John

    2017-01-01

    Moment magnitudes (MW) are computed for small and moderate earthquakes using a spectral fitting method. 40 of the resulting values are compared with those from broadband moment tensor solutions and found to match with negligible offset and scatter for available MW values of between 2.8 and 5.0. Using the presented method, MW are computed for 679 earthquakes in Switzerland with a minimum ML= 1.3. A combined bootstrap and orthogonal L1 minimization is then used to produce a scaling relation bet...

  6. Del libro de texto a YouTube; una aproximación a las nuevas tecnologías y a las nuevas formas de aprendizaje

    OpenAIRE

    Lucero Martínez, José Antonio

    2016-01-01

    Las nuevas tecnologías e Internet no solo han cambiado la manera en que nos comunicamos y nos relacionamos. También ha cambiado la forma en que nuestros niños y jóvenes aprenden. Por ello, los docentes de hoy en día deben conocer y comenzar a aplicar nuevas metodologías encaminadas a romper la brecha existente entre el alumnado y el método tradicional de enseñanza, basado en el libro de texto. En el siguiente artículo se expone de manera breve una experiencia docente basada en ...

  7. Una nueva especie de Columnea (Gesneriaceae del norte de los Andes

    Directory of Open Access Journals (Sweden)

    Skog Laurence E.

    2000-12-01

    Full Text Available A new species of Columnea L. belonging to section Ortholoma (Gesneriaceae from the Andean Region of Colombia and Ecuador is described.Se describe e ilustra una nueva especie de Columnea L. (Gesneriaceae perteneciente a la sección Ortholoma. La nueva especie proviene de la región andina de Colombia (Caquetá y Cauca y Ecuador (Napo.

  8. Nuevas especies de Axonopus (Poaceae: Panicoideae: Paniceae de la Amazonia Colombiana

    Directory of Open Access Journals (Sweden)

    Giraldo Cañas Diego

    1998-11-01

    Full Text Available Two new species of Axonopus, A. morronei (series Axonopus and A. zuloagae (series Barbigen are described. The new species are known only from the savannas and sandstone plateau of Colombian northwest Amazonia.Se describen dos nuevas especies de Axonopus, A. morronei y A. zuloagae, de las series Axonopus y Barbigeri, respectivamente. Las nuevas especies son conocidas únicamente de las sabanas y afloramientos rocosos de la Amazonia noroccidental colombiana.

  9. La mujer; manifestación de una nueva sensibilidad; principio de humanización

    OpenAIRE

    Mancipe Flechas, Eduardo; Beatriz Irizar, Liliana

    2006-01-01

    La postmodernidad ha redescubierto el valor insustituible de la dimensión femenina de la persona; que configura lo que el humanismo cívico define como una «nueva sensibilidad» cuyas raíces configuran el punto de partida para la comprensión de una nueva forma de orientar a los seres humanos hacia la plenitud de su humanidad

  10. Familias reconstituidas: Un estudio sobre las nuevas estructuras familiares

    Directory of Open Access Journals (Sweden)

    ISABEL ESPINAR FELLMANN

    2003-01-01

    Full Text Available En la mayoría de las investigaciones sobre la familia, los estudios se han centrado en las familias intactas o primeras familias. Sin embargo, es cada vez mayor el número de familias cuya configuración incluye un segundo matrimonio e hijos de una unión anterior (i.e. familias reconstituidas. En la consolidación del complejo proceso de ajuste de estas familias se han identificado unas fuentes comunes de estrés relacionadas principalmente con la formación de un nuevo sistema familiar. El objetivo de este artículo es realizar una revisión de las variables que inciden en el bienestar y/o malestar psicológico sobre una muestra de padrastros y madrastras españoles en el seno de estas nuevas configuraciones familiares. En una primera fase se realizaron, desde un diseño cualitativo, 20 entrevistas en profundidad a una muestra de padrastros y madrastras. En una segunda fase, se diseñó un cuestionario que fue respondido por 77 sujetos con la finalidad de analizar la posible relación entre alguna de las variables estudiadas.

  11. Dos nuevas Bignoniáceas del Valle del Magdalena

    Directory of Open Access Journals (Sweden)

    Dugand Armando

    1942-11-01

    Full Text Available Memora Romeroi: La especie aquí descrita pertenece a la sección Eumemora K. Schum. y es muy afín, según descripción, a M. caracasana K. Schum., de Venezuela, pero se distingue principalmente por tener racimos florales mucho más alargados, geminados y axilares, con 8, 12 a más flores opuestas, y por las brácteas infracalicinales de forma anchamente espatulada. Además, el cáliz y la corola son más cortos, particularmente el tubo basilar de esta última. EI raquis foliar y especialmente los peciolulos de M. Romeroi son diminutamente pubérulos, al menos durante mucho tiempo, y esta pubescencia menuda se presenta también en el raquis floral. / Tanaecium exitiosum: El doctor Rafael Mora, colector de esta muy interesante nueva especie, anota lo siguiente: "Arbusto que alcanza una altura de 2 metros; ocasionalmente crece más, arrollándose como bejuco a las otras plantas; las flores son de color blanco y de aspecto tubular alargado. La planta es abundante en las regiones secas de Barranca Bermeja y hay potreros que están completamente invadidos por ella".

  12. Una nueva especie de Burmeistera (Campanulaceae de Colombia

    Directory of Open Access Journals (Sweden)

    Lozano C. Gustavo

    1986-12-01

    Full Text Available Esta nueva especie se puede separar fácilmente de las demás especies del género Burmeistera por tener sus hojas profunda y repetidamente pinnatisectas característica nunca antes registrada en este grupo de plantas. Aparte de la especie aquí descrita, la única especie de Burmeistera que presenta la lámina foliar pinnatisecta (laciniada, es B. pteridioides,  Mc Vaugh, descrita de la Cordillera Oriental en Colombia (Mc VAUGH, 1965; sin embargo, las hojas de B. pteridioides tienen divisiones sólo de primer orden (simplemente pinnatisectas, mientras que las hojas de B. multipinnatisecta tienen divisiones hasta de quinto orden (pentapinnatisectas. Aún dentro de la familia Campanulaceae, el presentar la lámina foliar pinnatisecta es una característica  de escasa ocurrencia; en lo que respecta a las especies americanas, este carácter se presenta en las especies ya  mencionadas, B. multipinnatisecta  y B. pteridiodes y en Centropogon dissectus Wimm., una especie endémica del Ecuador (JEPPESEN, 1981.

  13. Seis nuevas inscripciones latinas de la Muralla de Segovia

    Directory of Open Access Journals (Sweden)

    Juan SANTOS YANGUAS

    2009-10-01

    Full Text Available RESUMEN: En este artículo damos a conocer seis nuevas inscripciones latinas de la mutalla de Segovia. Se trata de cuatro estelas de granito y dos bloques de caliza. Estas inscripciones están muy deterioradas y hemos utilizado para leerlas papel-aluminio, en el cual, al contacto con la piedra, quedan impresas las letras. Unicamente está completa, aunque borrada en parte, una de ellas, de la cual ofrecemos el testimonio de dos fotografías.ABSTRACT: In this article are published six new roman inscriptions from the wall at Segovia. They are four granite stellae and two limestone blocks. As all they are very damaged it was necessary to use a sheet of aluminium-paper; when the sheet is pressed over the stone-surface, the few traces of the letters are more easier to be read. Two fotogtaphs illustrate on the only inscription which is wholy conserved, being its icxt unfortunately partly disappeared.

  14. Nuevas tecnologías: nuevos medios, nuevos profesionales

    Directory of Open Access Journals (Sweden)

    Lic. Virginia Luzón

    1998-01-01

    Full Text Available Asistimos a un proceso de innovaciones aceleradas de las tecnologías de información que está conduciendo a la eclosión de nuevos medios y servicios, que a su vez están generando multiplicidad de nuevas formas de comunicación. (Cebrián Herreros, M. 1994. Pág. 165. Internet, el correo electrónico y la televisión a la carta son algunos de estos nuevos medios y servicios que hoy están al alcance de los consumidores. Si bien las diferentes formas de comunicación han girado en torno a la tecnología, nunca como hasta ahora habían estado tan supeditadas a la actividad tecnológica. La tecnología no es sólo una herramienta de trabajo, pasa a ser un valor añadido en las cadenas de producción, es incluso información confidencial de los diferentes medios de comunicación que hacen de su tecnología un valor de importancia estratégica.

  15. Los elementos integrantes de la nueva riqueza de la empresa

    Directory of Open Access Journals (Sweden)

    Mercedes Garcia-Parra

    2007-07-01

    Full Text Available Al analizar el valor real que tienen las empresas frente al valor que aparece en sus libros contables, se puede apreciar la existencia de una serie de activos intangibles. En un esfuerzo por explicar estos activos, han aparecido teorías como las basadas en la gestión del conocimiento, en el capital intelectual entre otras donde la importancia del valor de la empresa pasa de los recursos tangibles a los intangibles. La relativa juventud de este marco teórico, incorporado recientemente a las ciencias de la Administración, hace que no exista una nítida definición y diferenciación entre los conceptos que intervienen en esta nueva riqueza y que habitualmente se vinculen a una misma realidad. Este artículo pretende aportar una visión más clara de estos conceptos y su vinculación a la creación de ventajas competitivas en las empresas.

  16. Nueva evidencia sobre la Statistical Anxiety Scale (SAS

    Directory of Open Access Journals (Sweden)

    Amparo Oliver

    2014-01-01

    Full Text Available Las asignaturas relacionadas con la estadística suelen tener problemas de rendimiento académico. La ansiedad se relaciona de forma negativa con el rendimiento y en particular, la ansiedad estadística puede ser un constructo clave en la mejora de la enseñanza de esta materia y afines. La Statistical Anxiety Scale (Vigil-Colet, Lorenzo-Seva y Condon, 2008 se creó con la pretensión de ser útil para predecir el rendimiento académico en estadística. Se fundamenta en tres dimensiones de ansiedad referidas a tres aspectos específicos: respecto al examen, cuando se pide ayuda en la comprensión de estadística y en el proceso de interpretación de resultados. Esta estructura de tres factores fue hallada en un primer momento por los autores de la escala y en una primera validación corroborada en estudiantes italianos y españoles. El presente estudio pretende añadir nueva evidencia sobre la fiabilidad y validez de la escala, empleando en el estudio de fiabilidad técnicas estadísticas robustas, y ampliando el estudio de la validez respecto a su principal criterio, el rendimiento académico, ya que no puede ser considerado sinónimo de autoeficacia.

  17. Magnitudes and frequencies of earthquakes in relation to seismic risk

    International Nuclear Information System (INIS)

    Sharma, R.D.

    1989-01-01

    Estimating the frequencies of occurrence of earthquakes of different magnitudes on a regional basis is an important task in estimating seismic risk at a construction site. Analysis of global earthquake data provides an insight into the magnitudes frequency relationship in a statistical manner. It turns out that, whereas a linear relationship between the logarithm of earthquake occurrence rates and the corresponding earthquake magnitudes fits well in the magnitude range between 5 and 7, a second degree polynomial in M, the earthquake magnitude provides a better description of the frequencies of earthquakes in a much wider range of magnitudes. It may be possible to adopt magnitude frequency relation for regions, for which adequate earthquake data are not available, to carry out seismic risk calculations. (author). 32 refs., 8 tabs., 7 figs

  18. Nuevas andanzas de rosto palido. Dimensiones del turismo sexual Nuevas andanzas de rosto palido. Dimensiones del turismo sexual

    Directory of Open Access Journals (Sweden)

    Julio Aramberri

    2005-09-01

    Full Text Available El turismo sexual ha sido objeto de creciente atención en los estudios sobre turismo. La mayoría de los autores se ocupan de su expansión en el Sudeste asiático, con Tailandia como mascarón de proa. Para un grupo de investigadores el turismo sexual en ese área refleja, ante todo, una estrategia de desarrollo económico capitalista favorecida por los gobiernos locales y agencias económicas internacionales. Otros autores enfatizan que constituye otra nueva forma de dominación simbólica de Occidente sobre Oriente. Este trabajo analiza críticamente esas posiciones y concluye que el estudio de la prostitución en esos países debe ser objeto de un examen más general, enraizado en sus tradiciones familiares y culturales.Sex tourism has recently become one important topic in tourism research. Many authors discuss its expansion in Southeast Asia, significantly in Thailand. A sizeable number of researchers think that it reflects another facet of the international division of labor induced by capitalist development. This strategy has been consistently pursued by local governments and international agencies. Others see in sex tourism a new form of symbolic subjection of the Orient. This paper discusses those two points of view and concludes that prostitution in the area needs broader vistas including local family structures and cultural traditions.

  19. Social TV Analytics: Nuevas métricas para una nueva forma de ver televisión

    Directory of Open Access Journals (Sweden)

    Francisco Gallego

    2013-09-01

    Full Text Available La televisión social es un fenómeno todavía poco explorado en España pero las cadenas de televisión ya están aprendiendo a usar las redes sociales para su propio beneficio promocional y mercantil. Se trata de un nuevo campo de juego que requiere cierta reflexión para poner en práctica nuevas estrategias de negocio vinculadas al mundo de la televisión conectada y así poder aprovechar las oportunidades que en el futuro se presentarán. La presente investigación se centra en el análisis de los datos obtenidos del uso e interacción de las principales cadenas de televisión españolas con sus respectivas comunidades en la red social Twitter, la de mayor vinculación práctica al mundo televisivo.

  20. Magnitude Estimation for Large Earthquakes from Borehole Recordings

    Science.gov (United States)

    Eshaghi, A.; Tiampo, K. F.; Ghofrani, H.; Atkinson, G.

    2012-12-01

    We present a simple and fast method for magnitude determination technique for earthquake and tsunami early warning systems based on strong ground motion prediction equations (GMPEs) in Japan. This method incorporates borehole strong motion records provided by the Kiban Kyoshin network (KiK-net) stations. We analyzed strong ground motion data from large magnitude earthquakes (5.0 ≤ M ≤ 8.1) with focal depths < 50 km and epicentral distances of up to 400 km from 1996 to 2010. Using both peak ground acceleration (PGA) and peak ground velocity (PGV) we derived GMPEs in Japan. These GMPEs are used as the basis for regional magnitude determination. Predicted magnitudes from PGA values (Mpga) and predicted magnitudes from PGV values (Mpgv) were defined. Mpga and Mpgv strongly correlate with the moment magnitude of the event, provided sufficient records for each event are available. The results show that Mpgv has a smaller standard deviation in comparison to Mpga when compared with the estimated magnitudes and provides a more accurate early assessment of earthquake magnitude. We test this new method to estimate the magnitude of the 2011 Tohoku earthquake and we present the results of this estimation. PGA and PGV from borehole recordings allow us to estimate the magnitude of this event 156 s and 105 s after the earthquake onset, respectively. We demonstrate that the incorporation of borehole strong ground-motion records immediately available after the occurrence of large earthquakes significantly increases the accuracy of earthquake magnitude estimation and the associated improvement in earthquake and tsunami early warning systems performance. Moment magnitude versus predicted magnitude (Mpga and Mpgv).

  1. Radiation safety

    International Nuclear Information System (INIS)

    Auxier, J.A.

    1977-01-01

    Data available on the biological effects of radiation on man are reviewed, with emphasis on dose response to low LET and high LET radiation sources, and the effects of dose rate. Existing guides for radiation protection were formulated largely on the basis of tumor induction in the bone of radium dial painters, but the ICRP/NCRP annual dose guides of 5 rem/yr are of the same general magnitude as the doses received in several parts of the world from the natural radiation environment. Because of the greater sensitivity of rapidly dividing cells and the assumption that radiation occupations would not begin before the age of eighteen, maximum exposure levels were set as 5 (N-18) rem/yr, where N is the exposed worker's age in years. However, in the case of the natural radiation environment, exposure commences, in a sense, with the exposure of the ovum of the individual's mother; and the ovum is formed during the fetal development of the mother. In occupational exposures, the professional health physicist has always practiced the as low as practical philosophy, and exposures have generally averaged far below the guidelines. The average annual exposure of the radiation worker in modern plants and laboratories is approximately equal to the average natural radiation environment exposure rate and far lower than the natural radiation environment in many parts of the world. There are numerous complications and uncertainties in quantifying radiation effects on humans, however, the greatest is that due to having to extrapolate from high dose levels at which effects have been measured and quantified, to low levels at which most exposures occur but at which no effects have been observed

  2. Presentación: Hacia una nueva interculturalidad (educativa

    Directory of Open Access Journals (Sweden)

    Miguel Zapata Ros

    2014-01-01

    mesa este problema de tal forma que se generen elementos que, integrados con otros como pueden ser diseños instruccionalesadecuados, pueda contribuir a su debate y a una posible vía de solución: se trata de una nueva interculturalidad. Pensamos que este problema se resolverá en la medida en que se desarrolle una nueva cultura docente, y en general de la educación, sobre la base de un progresivo desarrollo en los alumnos de la competencia intercultural, del pensamiento crítico, de la conciencia y de las prácticas de autorregulación.En este número hemos hecho pues una llamada con este propósito. La respuesta ha sido irregular. Pero ello no le quita validez al intento, queda la cuestión abierta y por otra parte hemos recibido una serie de trabajos que sin abordar directamente este tema constituyen valiosas aproximaciones a la realidad de la interculturalidad en la educación en nuestro entorno.

  3. Nuevas políticas sociales y Estado social relacional.

    Directory of Open Access Journals (Sweden)

    PIERPAOLO DONATI

    2004-01-01

    Full Text Available Según el autor, las sociedades europeas siguen inspirando las políticas sociales en un código (estatal de inclusión ?al que aquí se denomina lib/lab (mezcla de liberalismo y laborismo? que en el pasado ha constituido un factor de progreso, pero que actualmente resulta cada vez más débil y obsoleto. Las políticas sociales encuentran límites estructurales en sus posibilidades de innovación porque están formuladas como compromisos entre Estado y mercado, utilizando al sector terciario para remediar los fracasos de los otros dos sectores. De hecho, los sistemas sociales gobernados por lógicas lib/lab se encaminan a una crisis irreversible. El documento ilustra las nuevas tendencias de configuración de las políticas sociales, que aquí se denominan "societarias ". Se caracterizan por dos novedades principales: primero, por el hecho de que confían la inclusión social a una ciudadanía compleja (concebida como entrelazamiento de ciudadanía estatal y ciudadanía societaria, en la cual poseen un papel primordial los sujetos colectivos de la sociedad civil; segundo, porque definen el Bienestar, los servicios y los derechos sociales mediante un código simbólico de tipo relacional. En términos de orden institucional, se trata de pasar a un "cuarto modelo de Estado del Bienestar", es decir, a un Estado social de cuarta generación, después de haber dejado atrás el paternalista, el asistencial y el intervencionista. El autor lo denomina Estado social relacional.

  4. Developmental Dyscalculia in Adults: Beyond Numerical Magnitude Impairment.

    Science.gov (United States)

    De Visscher, Alice; Noël, Marie-Pascale; Pesenti, Mauro; Dormal, Valérie

    2017-09-01

    Numerous studies have tried to identify the core deficit of developmental dyscalculia (DD), mainly by assessing a possible deficit of the mental representation of numerical magnitude. Research in healthy adults has shown that numerosity, duration, and space share a partly common system of magnitude processing and representation. However, in DD, numerosity processing has until now received much more attention than the processing of other non-numerical magnitudes. To assess whether or not the processing of non-numerical magnitudes is impaired in DD, the performance of 15 adults with DD and 15 control participants was compared in four categorization tasks using numerosities, lengths, durations, and faces (as non-magnitude-based control stimuli). Results showed that adults with DD were impaired in processing numerosity and duration, while their performance in length and face categorization did not differ from controls' performance. Our findings support the idea of a nonsymbolic magnitude deficit in DD, affecting numerosity and duration processing but not length processing.

  5. Magnitude of Interfractional Vaginal Cuff Movement: Implications for External Irradiation

    International Nuclear Information System (INIS)

    Ma, Daniel J.; Michaletz-Lorenz, Martha; Goddu, S. Murty; Grigsby, Perry W.

    2012-01-01

    Purpose: To quantify the extent of interfractional vaginal cuff movement in patients receiving postoperative irradiation for cervical or endometrial cancer in the absence of bowel/bladder instruction. Methods and Materials: Eleven consecutive patients with cervical or endometrial cancer underwent placement of three gold seed fiducial markers in the vaginal cuff apex as part of standard of care before simulation. Patients subsequently underwent external irradiation and brachytherapy treatment based on institutional guidelines. Daily megavoltage CT imaging was performed during each external radiation treatment fraction. The daily positions of the vaginal apex fiducial markers were subsequently compared with the original position of the fiducial markers on the simulation CT. Composite dose–volume histograms were also created by summing daily target positions. Results: The average (± standard deviation) vaginal cuff movement throughout daily pelvic external radiotherapy when referenced to the simulation position was 16.2 ± 8.3 mm. The maximum vaginal cuff movement for any patient during treatment was 34.5 mm. In the axial plane the mean vaginal cuff movement was 12.9 ± 6.7 mm. The maximum vaginal cuff axial movement was 30.7 mm. In the craniocaudal axis the mean movement was 10.3 ± 7.6 mm, with a maximum movement of 27.0 mm. Probability of cuff excursion outside of the clinical target volume steadily dropped as margin size increased (53%, 26%, 4.2%, and 1.4% for 1.0, 1.5, 2.0, and 2.5 cm, respectively.) However, rectal and bladder doses steadily increased with larger margin sizes. Conclusions: The magnitude of vaginal cuff movement is highly patient specific and can impact target coverage in patients without bowel/bladder instructions at simulation. The use of vaginal cuff fiducials can help identify patients at risk for target volume excursion.

  6. Reinforcement Magnitude: An Evaluation of Preference and Reinforcer Efficacy

    OpenAIRE

    Trosclair-Lasserre, Nicole M; Lerman, Dorothea C; Call, Nathan A; Addison, Laura R; Kodak, Tiffany

    2008-01-01

    Consideration of reinforcer magnitude may be important for maximizing the efficacy of treatment for problem behavior. Nonetheless, relatively little is known about children's preferences for different magnitudes of social reinforcement or the extent to which preference is related to differences in reinforcer efficacy. The purpose of the current study was to evaluate the relations among reinforcer magnitude, preference, and efficacy by drawing on the procedures and results of basic experimenta...

  7. Integration and magnitude homogenization of the Egyptian earthquake catalogue

    International Nuclear Information System (INIS)

    Hussein, H.M.; Abou Elenean, K.A.; Marzouk, I.A.; Abu El-Nader, E.; Peresan, A.; Korrat, I.M.; Panza, G.F.; El-Gabry, M.N.

    2008-03-01

    The aim of the present work is to compile and update a catalogue of the instrumentally recorded earthquakes in Egypt, with uniform and homogeneous source parameters as required for the analysis of seismicity and seismic hazard assessment. This in turn requires a detailed analysis and comparison of the properties of different available sources, including the distribution of events with time, the magnitude completeness and the scaling relations between different kinds of magnitude reported by different agencies. The observational data cover the time interval 1900- 2004 and an area between 22--33.5 deg N and 25--3 6 deg. E. The linear regressions between various magnitude types have been evaluated for different magnitude ranges. Using the best linear relationship determined for each available pair of magnitudes, as well as those identified between the magnitudes and the seismic moment, we convert the different magnitude types into moment magnitudes M W , through a multi-step conversion process. Analysis of the catalogue completeness, based on the MW thus estimated, allows us to identify two different time intervals with homogeneous properties. The first one (1900- 1984) appears to be complete for M W ≥ 4.5, while the second one (1985-2004) can be considered complete for magnitudes M W ≥ 3. (author)

  8. Moment Magnitudes and Local Magnitudes for Small Earthquakes: Implications for Ground-Motion Prediction and b-values

    Science.gov (United States)

    Baltay, A.; Hanks, T. C.; Vernon, F.

    2016-12-01

    We illustrate two essential consequences of the systematic difference between moment magnitude and local magnitude for small earthquakes, illuminating the underlying earthquake physics. Moment magnitude, M 2/3 log M0, is uniformly valid for all earthquake sizes [Hanks and Kanamori, 1979]. However, the relationship between local magnitude ML and moment is itself magnitude dependent. For moderate events, 3> fmax. Just as importantly, if this relation is overlooked, prediction of large-magnitude ground motion from small earthquakes will be misguided. We also consider the effect of this magnitude scale difference on b-value. The oft-cited b-value of 1 should hold for small magnitudes, given M. Use of ML necessitates b=2/3 for the same data set; use of mixed, or unknown, magnitudes complicates the matter further. This is of particular import when estimating the rate of large earthquakes when one has limited data on their recurrence, as is the case for induced earthquakes in the central US.

  9. Radiation in daily life

    International Nuclear Information System (INIS)

    Mora Rodriguez, P.

    1999-01-01

    The medical community benefits on a daily basis from the ionizing radiations used in the diagnosis and treatment of disease. The doses received in the medical field are only a small fraction of the total radiation received in a year. This bibliographic review has several objectives. The first one is to present the different components of natural radiation (background radiation). Secondly, it will introduce many consumer products that contain radioactive sources and expose our bodies. Third, arguments to diminish the radiation phobia will be presented and finally an easy to understand dosimetric magnitude will be introduced for the physician, the technologist and the patient. (author) [es

  10. Magnitude Knowledge: The Common Core of Numerical Development

    Science.gov (United States)

    Siegler, Robert S.

    2016-01-01

    The integrated theory of numerical development posits that a central theme of numerical development from infancy to adulthood is progressive broadening of the types and ranges of numbers whose magnitudes are accurately represented. The process includes four overlapping trends: (1) representing increasingly precisely the magnitudes of non-symbolic…

  11. Linear Numerical-Magnitude Representations Aid Children's Memory for Numbers

    Science.gov (United States)

    Thompson, Clarissa A.; Siegler, Robert S.

    2010-01-01

    We investigated the relation between children's numerical-magnitude representations and their memory for numbers. Results of three experiments indicated that the more linear children's magnitude representations were, the more closely their memory of the numbers approximated the numbers presented. This relation was present for preschoolers and…

  12. Non extensivity and frequency magnitude distribution of earthquakes

    International Nuclear Information System (INIS)

    Sotolongo-Costa, Oscar; Posadas, Antonio

    2003-01-01

    Starting from first principles (in this case a non-extensive formulation of the maximum entropy principle) and a phenomenological approach, an explicit formula for the magnitude distribution of earthquakes is derived, which describes earthquakes in the whole range of magnitudes. The Gutenberg-Richter law appears as a particular case of the obtained formula. Comparison with geophysical data gives a very good agreement

  13. Reinforcement Magnitude: An Evaluation of Preference and Reinforcer Efficacy

    Science.gov (United States)

    Trosclair-Lasserre, Nicole M.; Lerman, Dorothea C.; Call, Nathan A.; Addison, Laura R.; Kodak, Tiffany

    2008-01-01

    Consideration of reinforcer magnitude may be important for maximizing the efficacy of treatment for problem behavior. Nonetheless, relatively little is known about children's preferences for different magnitudes of social reinforcement or the extent to which preference is related to differences in reinforcer efficacy. The purpose of the current…

  14. Nuevas experiencias en urbanismo. Internet al servicio del planeamiento urbano

    Directory of Open Access Journals (Sweden)

    Hernández Sánchez, J. A.

    1997-10-01

    Full Text Available The present article is the description of a prototype. This job consists on the publication of a General City Planning Advance, where the newest technologies offered by the market have been used. Our intention is to perform an Information System, easy to access by everybody but powerful enough to offer a complete information to the citizens. We also are trying to provide the Public Institutions a fluent way to attend to the demands of the people. The project describes two different ways of accessing the City Planning Information. The first manner is the classical way we can find in almost every website, though this is the first time that it is used for this purpose, the publication of a City Planning. The second one is based on the connection of a Geographical Information System through Internet, to provide dynamic access to the information stored in the database of the GIS. This project has been developed trough the S.I.C. project, a project housed in the Facultad de Informática of the Universidad Politécnica de Madrid and supported by the PASO Special Action from the Ministry of Industry and Energy of Spain and the European Community.

    Este artículo recoge la descripción de un trabajo piloto, consistente en la publicación del Avance de un Plan General de Urbanismo, en el cual se han utilizado las nuevas tecnologías que el mercado ofrece. Con este trabajo se pretende realizar un sistema de información de fácil acceso que proporcione una información eficaz a todos los ciudadanos y que, a su vez, facilite la gestión de las Instituciones Públicas. El proyecto describe dos modos distintos de acceder a la información urbanística. Una forma estática, modo habitual de representar la información en Internet, empleada por vez primera en el planeamiento urbanístico. Y una segunda forma, fundamentada en la conexión de un Sistema GIS a Internet, que permite acceder dinámicamente a la información almacenada en una base de datos

  15. Nuevas relaciones laborales en la industria automotriz colombiana

    Directory of Open Access Journals (Sweden)

    Edgar Augusto Valero

    2004-01-01

    Full Text Available Los sectores de ensamble de autos y fabricación de autopartes en Colombia describen las presiones que ejerce el entorno competitivo internacional sobre la eficiencia y la calidad. Estas presiones han incidido en la adopción de nuevas formas de organización del trabajo y en el cambio casi generalizado de políticas de personal durante los últimos quince años. En este artículo se analiza e ilustra un conjunto de transformaciones significativas en las relaciones laborales en esta rama industrial, con base en información cualitativa de las tres más importante plantas terminales del país y de dos notables compañías fabricantes de componentes. Aunque las dinámicas no son homogéneas, se puede decir que el proceso más generalizado ha sido el debilitamiento de la negociación colectiva y las relaciones industriales, como bases para la interacción y el acuerdo entre capital y trabajo. Las políticas de personal y formas de organización de la producción han conducido en casi todas los espacios a una definición autoritaria y unilateral de las relaciones laborales y de las condiciones de trabajo por parte de las empresas. Los nuevos modelos de relaciones laborales se van conformando a través de prácticas organizativas y de gestión de personal que combinan mecanismos tradicionales de coacción y flexibilidad (políticas antisindicales y trabajo temporal con elaboradas y sutiles estrategias para generar entre los trabajadores sentido de pertenencia y compromiso con los fines de las empresas (adoctrinamiento en el discurso empresarial de la competitividad, llamados a la participación y autocontrol para el logro de mejores estándares de calidad, prácticas neopaternalistas, entre otras.

  16. ¿Cooptación, cooperación o competencia? Microfinanzas y nuevas izquierdas en Bolivia, Ecuador y Nicaragua

    Directory of Open Access Journals (Sweden)

    Florent Bédécarrats

    2013-05-01

    Full Text Available La última década ha estado marcada por el resurgimiento de movimientos políticos izquierdistas en Latinoamérica. Sin embargo, la magnitud del alzamiento de estas “nuevas izquierdas” oculta a menudo la relación ambivalente entre estos movimientos y la sociedad, así como su lucha por encontrar alternativas al modelo de desarrollo prevaleciente. A lo largo del continente, el sector de las microfinanzas ha llenado el vacío dejado por los fallos de los bancos públicos, desarrollándose bajo una forma crecientemente comercial. Análisis de Nicaragua, Ecuador y Bolivia revelan que los nuevos gobiernos comparten su desconfianza hacia las IMF (instituciones de microfinanzas. Sin embargo, en la ausencia de alternativas viables para la provisión de servicios financieros, los gobiernos y las microfinanzas se ven obligados a coexistir. El medio en el cual lo hacen varía grandemente, dependiendo de políticas locales y factores institucionales. No obstante, algunas tendencias comunes pueden ser discernidas.

  17. Adolescents with Developmental Dyscalculia Do Not Have a Generalized Magnitude Deficit – Processing of Discrete and Continuous Magnitudes

    Science.gov (United States)

    McCaskey, Ursina; von Aster, Michael; O’Gorman Tuura, Ruth; Kucian, Karin

    2017-01-01

    The link between number and space has been discussed in the literature for some time, resulting in the theory that number, space and time might be part of a generalized magnitude system. To date, several behavioral and neuroimaging findings support the notion of a generalized magnitude system, although contradictory results showing a partial overlap or separate magnitude systems are also found. The possible existence of a generalized magnitude processing area leads to the question how individuals with developmental dyscalculia (DD), known for deficits in numerical-arithmetical abilities, process magnitudes. By means of neuropsychological tests and functional magnetic resonance imaging (fMRI) we aimed to examine the relationship between number and space in typical and atypical development. Participants were 16 adolescents with DD (14.1 years) and 14 typically developing (TD) peers (13.8 years). In the fMRI paradigm participants had to perform discrete (arrays of dots) and continuous magnitude (angles) comparisons as well as a mental rotation task. In the neuropsychological tests, adolescents with dyscalculia performed significantly worse in numerical and complex visuo-spatial tasks. However, they showed similar results to TD peers when making discrete and continuous magnitude decisions during the neuropsychological tests and the fMRI paradigm. A conjunction analysis of the fMRI data revealed commonly activated higher order visual (inferior and middle occipital gyrus) and parietal (inferior and superior parietal lobe) magnitude areas for the discrete and continuous magnitude tasks. Moreover, no differences were found when contrasting both magnitude processing conditions, favoring the possibility of a generalized magnitude system. Group comparisons further revealed that dyscalculic subjects showed increased activation in domain general regions, whilst TD peers activate domain specific areas to a greater extent. In conclusion, our results point to the existence of a

  18. Adolescents with Developmental Dyscalculia Do Not Have a Generalized Magnitude Deficit - Processing of Discrete and Continuous Magnitudes.

    Science.gov (United States)

    McCaskey, Ursina; von Aster, Michael; O'Gorman Tuura, Ruth; Kucian, Karin

    2017-01-01

    The link between number and space has been discussed in the literature for some time, resulting in the theory that number, space and time might be part of a generalized magnitude system. To date, several behavioral and neuroimaging findings support the notion of a generalized magnitude system, although contradictory results showing a partial overlap or separate magnitude systems are also found. The possible existence of a generalized magnitude processing area leads to the question how individuals with developmental dyscalculia (DD), known for deficits in numerical-arithmetical abilities, process magnitudes. By means of neuropsychological tests and functional magnetic resonance imaging (fMRI) we aimed to examine the relationship between number and space in typical and atypical development. Participants were 16 adolescents with DD (14.1 years) and 14 typically developing (TD) peers (13.8 years). In the fMRI paradigm participants had to perform discrete (arrays of dots) and continuous magnitude (angles) comparisons as well as a mental rotation task. In the neuropsychological tests, adolescents with dyscalculia performed significantly worse in numerical and complex visuo-spatial tasks. However, they showed similar results to TD peers when making discrete and continuous magnitude decisions during the neuropsychological tests and the fMRI paradigm. A conjunction analysis of the fMRI data revealed commonly activated higher order visual (inferior and middle occipital gyrus) and parietal (inferior and superior parietal lobe) magnitude areas for the discrete and continuous magnitude tasks. Moreover, no differences were found when contrasting both magnitude processing conditions, favoring the possibility of a generalized magnitude system. Group comparisons further revealed that dyscalculic subjects showed increased activation in domain general regions, whilst TD peers activate domain specific areas to a greater extent. In conclusion, our results point to the existence of a

  19. Conversion of Local and Surface-Wave Magnitudes to Moment Magnitude for Earthquakes in the Chinese Mainland

    Science.gov (United States)

    Li, X.; Gao, M.

    2017-12-01

    The magnitude of an earthquake is one of its basic parameters and is a measure of its scale. It plays a significant role in seismology and earthquake engineering research, particularly in the calculations of the seismic rate and b value in earthquake prediction and seismic hazard analysis. However, several current types of magnitudes used in seismology research, such as local magnitude (ML), surface wave magnitude (MS), and body-wave magnitude (MB), have a common limitation, which is the magnitude saturation phenomenon. Fortunately, the problem of magnitude saturation was solved by a formula for calculating the seismic moment magnitude (MW) based on the seismic moment, which describes the seismic source strength. Now the moment magnitude is very commonly used in seismology research. However, in China, the earthquake scale is primarily based on local and surface-wave magnitudes. In the present work, we studied the empirical relationships between moment magnitude (MW) and local magnitude (ML) as well as surface wave magnitude (MS) in the Chinese Mainland. The China Earthquake Networks Center (CENC) ML catalog, China Seismograph Network (CSN) MS catalog, ANSS Comprehensive Earthquake Catalog (ComCat), and Global Centroid Moment Tensor (GCMT) are adopted to regress the relationships using the orthogonal regression method. The obtained relationships are as follows: MW=0.64+0.87MS; MW=1.16+0.75ML. Therefore, in China, if the moment magnitude of an earthquake is not reported by any agency in the world, we can use the equations mentioned above for converting ML to MW and MS to MW. These relationships are very important, because they will allow the China earthquake catalogs to be used more effectively for seismic hazard analysis, earthquake prediction, and other seismology research. We also computed the relationships of and (where Mo is the seismic moment) by linear regression using the Global Centroid Moment Tensor. The obtained relationships are as follows: logMo=18

  20. Defining Tsunami Magnitude as Measure of Potential Impact

    Science.gov (United States)

    Titov, V. V.; Tang, L.

    2016-12-01

    The goal of tsunami forecast, as a system for predicting potential impact of a tsunami at coastlines, requires quick estimate of a tsunami magnitude. This goal has been recognized since the beginning of tsunami research. The work of Kajiura, Soloviev, Abe, Murty, and many others discussed several scales for tsunami magnitude based on estimates of tsunami energy. However, difficulties of estimating tsunami energy based on available tsunami measurements at coastal sea-level stations has carried significant uncertainties and has been virtually impossible in real time, before tsunami impacts coastlines. The slow process of tsunami magnitude estimates, including collection of vast amount of available coastal sea-level data from affected coastlines, made it impractical to use any tsunami magnitude scales in tsunami warning operations. Uncertainties of estimates made tsunami magnitudes difficult to use as universal scale for tsunami analysis. Historically, the earthquake magnitude has been used as a proxy of tsunami impact estimates, since real-time seismic data is available of real-time processing and ample amount of seismic data is available for an elaborate post event analysis. This measure of tsunami impact carries significant uncertainties in quantitative tsunami impact estimates, since the relation between the earthquake and generated tsunami energy varies from case to case. In this work, we argue that current tsunami measurement capabilities and real-time modeling tools allow for establishing robust tsunami magnitude that will be useful for tsunami warning as a quick estimate for tsunami impact and for post-event analysis as a universal scale for tsunamis inter-comparison. We present a method for estimating the tsunami magnitude based on tsunami energy and present application of the magnitude analysis for several historical events for inter-comparison with existing methods.

  1. New moment magnitude scale, evidence of stress drop magnitude scaling and stochastic ground motion model for the French West Indies

    Science.gov (United States)

    Drouet, Stéphane; Bouin, Marie-Paule; Cotton, Fabrice

    2011-12-01

    In this study we analyse records from the 'Les Saintes' seismic sequence following the Mw= 6.3 earthquake of 2004 November 11, which occurred close to Guadeloupe (French West Indies). 485 earthquakes with magnitudes from 2 to 6, recorded at distances between 5 and 150 km are used. S-waves Fourier spectra are analysed to simultaneously determine source, path and site terms. The results show that the duration magnitude routinely estimated for the events that occurred in the region underestimate moment magnitude by 0.5 magnitude units over the whole magnitude range. From the inverted seismic moments and corner frequencies, we compute Brune's stress drops. We show that stress drops increase with increasing magnitude. The same pattern is observed on apparent stresses (i.e. the seismic energy-to-moment ratio). However, the rate of increase diminishes at high magnitudes, which is consistent with a constant stress drop model for large events. Using the results of the inversions, we perform ground motion simulations for the entire data set using the SMSIM stochastic simulation tool. The results show that a good fit (σ= 0.25) with observed data is achieved when the source is properly described by its moment magnitude and stress drop, and when site effects are taken into account. Although the magnitude-dependent stress drop model is giving better results than the constant stress drop model, the interevent variability remains high, which could suggest that stress drop depends on other parameters such as the depth of the hypocentre. In any case, the overall variability is of the same order of magnitude as usually observed in empirical ground motion prediction equations.

  2. Nueva Francia y Nueva Inglaterra en el contexto de los Tratados de Utrecht (1713. Lucha por el Imperio e Historia Transatlántica

    Directory of Open Access Journals (Sweden)

    de Bernardo Ares, José Manuel

    2015-06-01

    Full Text Available After establishing the spatiotemporal coordinates of the work, along with an interpretive perspective of political history, the metropolitan powers of France and England in their American expansion, autochthonous-Amerindian powers and colonial powers of New France and New England between 1661 and 1713 have been analysed.Después de fijar las coordenadas espacio temporales del trabajo, así como la óptica interpretativa de la historia política, se analizan los poderes metropolitanos de Francia e Inglaterra en su expansión americana, los poderes autóctonos-amerindios y los poderes coloniales de Nueva Francia y Nueva Inglaterra entre 1661 y 1713.

  3. Muhlenbergia monandra (Poaceae: Eragrostideae, nueva especie anual endémica del Perú

    Directory of Open Access Journals (Sweden)

    J. José Alegría Olivera

    2001-01-01

    Full Text Available Se describe e ilustra Muhlenbergia monandra, endémica de Perú. La nueva especie se caracteriza por sus glumas mayores que el antecio, por tener inflorescencias espiciformes y las flores cleistógamas con un estambre. La anatomía foliar se describe e ilustra y se detallan sus caracteres diferenciales. Se incluyen observaciones sobre la epidermis de la lemma y las glumas realizadas con el Microscopio Electrónico de Barrido. Se discute la posición taxonómica de la nueva entidad y las diferencias con las especies anuales relacionadas que habitan en América del Sur

  4. MOVIMIENTOS SOCIALES Y NUEVAS PRÁCTICAS POLÍTICAS EN ARGENTINA. LAS ORGANIZACIONES PIQUETERAS

    OpenAIRE

    Maristella Svampa

    2004-01-01

    En la Argentina de la última década emergieron nuevas formas de organización política y acción colectiva cuyas marcas mayores son la acción directa, la auto-organización y una importante dinámica asamblearia. Tres tipos de experiencias ilustran de manera diferente estas nuevas prácticas: las agrupaciones piqueteras (desocupados), las asambleas barriales y las fábricas recuperadas por sus trabajadores. Este artículo abordará algunos de los aspectos novedosos que presenta uno de estos movimient...

  5. Historias transnacionales: nuevas interpretaciones de los enclaves en América Latina

    Directory of Open Access Journals (Sweden)

    Catherine LeGrand

    2006-01-01

    Full Text Available Este ensayo revisa las nuevas direcciones en la investigación sobre ¿enclaves extranjeros¿ en América Latina, centrándose particularmente en las regiones bananeras de la United Fruit Company (UFCO en el Caribe y Centroamérica. Explora las preguntas y aproximaciones que orientan la ¿nueva historia de los enclaves¿ producida en universidades norteamericanas en los últimos quince años, las críticas que han surgido a dichos estudios y el giro contemporáneo en la mirada a las luchas por los recursos naturales.

  6. Una nueva especie de bolitoglossa (caudata: plethodontidae) de las selvas del magdalena medio en colombia

    OpenAIRE

    Acosta Galvis, Andrés R.; Restrepo, Ana E.

    2010-01-01

    Se describe una nueva especie del genero Bolitoglossa del grupo alfa (sensu Wake & Lynch, 1976) denominada Bolitoglossa lozanoi de las selvas húmedas relictuales del valle del Río Magdalena en La Cordillera Central de Colombia (loe. typ.: Río La Miel, Mpio. La Victoria, Departamento de Caldas, 500 m.s.n.m.); la nueva especie es reconocible por su cuerpo robusto, las palmeaduras manuales y pediales extensas, su patrón cromático ventral café con punteaduras café más oscuras y crema, ojos no pro...

  7. LA LITERATURA SOBRE LAS NUEVAS RELIGIOSIDADES EN LAS CLASES MEDIAS URBANAS. UNA MIRADA DESDE ARGENTINA

    OpenAIRE

    Nicolás Viotti

    2011-01-01

    Este trabajo se propone hacer un recorrido por la literatura sobre las nuevas religiosidades en elámbito urbano de los sectores medios argentinos que encarnan idealmente el catolicismo de tipocarismático y la llamada Nueva Era. Esta indagación detalla dos movimientos de análisis sobrecómo religiosidad y clase media se vinculan. En primer lugar describe los trabajos que, centradosen prácticas y experiencias religiosas específicas, remiten a la clase media como una característicagenérica de los...

  8. Nueva especie del género Arctosa (Araneae, Lycosidae del sur de Brazil

    Directory of Open Access Journals (Sweden)

    Estevam Luís Cruz da Silva

    2008-12-01

    Full Text Available Se describe e ilustra una nueva especie del género Arctosa C. L. a Koch, 1848, en base a material procedente de Sapiranga, sur del Brasil. Los miembros de este género por lo general excavan refugios pequeños en los bordes arenosos de los lagos, sin embargo, esta nueva especie se encuentra debajo de rocas en los bordes de rios pequeños. Se puede encontrar hembras con ootecas y machos durante todo el año, aunque son más abundantes en el período del verano.

  9. Characteristics of North Korea nuclear test and KMA magnitude scale

    Science.gov (United States)

    Jeon, Y. S.; Lee, D.; Min, K.; Hwang, E. H.; Lee, J.; Park, E.; Jo, E.; Lee, M. S.

    2017-12-01

    Democratic People's Republic of Korea(DPRK) carried out 6th nuclear test on 3 Sep. 2017 at 03:30 UTC. Korea Meteorological Administration(KMA) announced to the public that the event took place in the DPRK's test site, Punggye-ri with the magnitude 5.7. This event is larger than previous one in terms of magnitude and showed that measured magnitude strongly depends on the frequency band of data. After we applied several magnitude scales such as Everdon(1967), Nuttli(1967), and Hong & Lee(2012) to this event, we found that magnitude ranges from 5.3 to 6.7 which depends on frequency band and epicentral distance of signal. 6th DPRK test experiment indicated that spectral amplitude ratio of 6th/5th near 2.37 Hz shows similar amplification compatible to relative spectral magnitude 5.7, while spectral amplitude ratio of 6th/5th near 1.0 Hz marks relative spectral magnitude about 6.1. Relative spectral magnitude varies with frequencies and decreases as frequency increase. We found that systematic non-linearity exists for spectral amplitude ratio of 6th/5th from 1.0 to 10.0 Hz, while it's characteristic is not found at 5th/4th and 4th/3th. A methodology is presented for determining mb(Pn) magnitude of underground nuclear explosions from local Pn phase. 582 waveforms from vertical component of broadband and acceleration seismographs at 120 stations in the epicenter distance from 340 to 800 km are used to calibrate mb(Pn) magnitude scaling for DPRK's nuclear tests. The mb(Pn) estimates of regional events for Korean Peninsula are determined to be mb(Pn) ? = log10(A) + 2.1164×log10(d) - 0.2721, where A is the peak-to-peak Pn amplitude in μm and d is the epicentral distance in km. Systematic non-linearity does not observed at frequency band from 0.1 to 1.0 Hz. The magnitude of 6th event is mb(Pn) 6.08 and mb(Pn) 4.52, 4.92, 4.84 and 5.03 for 2nd, 3rd, 4th and 5th respectively. Further research of applicable mb(Pn) magnitude scaling is required for all frequency band and

  10. The bolometric, infrared and visual absolute magnitudes of Mira variables

    International Nuclear Information System (INIS)

    Robertson, B.S.C.; Feast, M.W.

    1981-01-01

    Statistical parallaxes, as well as stars with individually known distances are used to derive bolometric and infrared absolute magnitudes of Mira (Me) variables. The derived bolometric magnitudes are in the mean about 0.75 mag fainter than recent estimates. The problem of determining the pulsation constant is discussed. Miras with periods greater than 150 days probably pulsate in the first overtone. Those of shorter periods are anomalous and may be fundamental pulsators. It is shown that the absolute visual magnitudes at mean light of Miras with individually determined distances are consistent with values derived by Clayton and Feast from statistical parallaxes. (author)

  11. Ampliación del puerto Lyttelton. Nueva Zelanda

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1965-05-01

    Full Text Available Lyttleton Port Authority has drawn up a project for the reform and construction of new wharves and breakwaters, to cater for the increasing sea traffic. The cost of the project is 4.5 million pounds. The main work consists of a 1,070 m long front wharf, built in deep water, and apt for use by large ships. The structure of the wharf consists of a filled in zone, taken from the sea, along the edge of which a row of piles has been arranged, to support the wharf itself. This has been made with hard Australian timber. But the platform over the filled in zone is built with soft local timber. The hills rising along the coastline have been traversed by two tunnels: one for the roadway and the other to take the railway. These communication lines, which save 11 km, will link the harbour with Christchurch, the most important city in South Island. The bottom, where the wharf has been made, was soft mud, awkward to contain and control. To overcome this difficulty a simple and ingenious method was adopted. Loads of stone, from nearby quarry residues, were thrown into the mud. The stones pushed out the mud in the manner of a wavefront. The mud was then dredged away, and the stone filling operation was continued. Stone had to be used as there was insufficient sand in the neighbourhood.La Junta de Obras del puerto de Lyttelton (Nueva Zelanda ha redactado un proyecto de reforma y construcción de nuevos muelles y rompeolas para absorber el creciente movimiento portuario, cuyo coste se eleva a 4,5 millones de libras. La obra consiste en un muelle frontal, continuo, de 1.070 m de longitud, en zona de gran calado, capaz para que atraquen barcos de gran tonelaje. La estructura está constituida por una zona de rellenos, ganados al mar, en cuyo frente se hallan unas filas de pilotes sobre los que descansa la estructura del muelle, construida a base de madera dura australiana; en cambio, la plataforma formada sobre el relleno es de madera blanda del país. Los montes

  12. On the magnitude and recurence of Vrancea earthquakes

    International Nuclear Information System (INIS)

    Oncescu, M.C.

    1987-07-01

    The moment-magnitude scale Msub(W) is proposed for the quantification of Vrancea earthquakes. The asperity model is found adequate to explain the observed quasi-cycles and super-cycles in the occurrence of large events. (auhtor)

  13. Disparities in the Magnitude of Human Immunodeficiency Virus ...

    African Journals Online (AJOL)

    and low/middle‑income countries (LMICs) in the magnitude of HIV‑related OIs in pre‑highly ... HICs while tuberculosis, candidiasis, chronic diarrhea, and cryptococcosis were predominant ...... Mohar A. Transfusion associated AIDS in Mexico.

  14. Magnitude and factors associated with post-cesarean surgical site ...

    African Journals Online (AJOL)

    Magnitude and factors associated with post-cesarean surgical site infection at Hawassa University Teaching and referral hospital, southern Ethiopia: a ... the hospital. Thus, it should be averted by implementing infection prevention techniques.

  15. Rapid earthquake magnitude determination for Vrancea early warning system

    International Nuclear Information System (INIS)

    Marmureanu, Alexandru

    2009-01-01

    Due to the huge amount of recorded data, an automatic procedure was developed and used to test different methods to rapidly evaluate earthquake magnitude from the first seconds of the P wave. In order to test all the algorithms involved in detection and rapid earthquake magnitude estimation, several tests were performed, in order to avoid false alarms. A special detection algorithm was developed, that is based on the classical STA/LTA algorithm and tuned for early warning purpose. A method to rapidly estimate magnitude in 4 seconds from detection of P wave in the epicenter is proposed. The method was tested on al recorded data, and the magnitude error determination is acceptable taking into account that it is computed from only 3 stations in a very short time interval. (author)

  16. Impact of magnitude uncertainties on seismic catalogue properties

    Science.gov (United States)

    Leptokaropoulos, K. M.; Adamaki, A. K.; Roberts, R. G.; Gkarlaouni, C. G.; Paradisopoulou, P. M.

    2018-05-01

    Catalogue-based studies are of central importance in seismological research, to investigate the temporal, spatial and size distribution of earthquakes in specified study areas. Methods for estimating the fundamental catalogue parameters like the Gutenberg-Richter (G-R) b-value and the completeness magnitude (Mc) are well established and routinely applied. However, the magnitudes reported in seismicity catalogues contain measurement uncertainties which may significantly distort the estimation of the derived parameters. In this study, we use numerical simulations of synthetic data sets to assess the reliability of different methods for determining b-value and Mc, assuming the G-R law validity. After contaminating the synthetic catalogues with Gaussian noise (with selected standard deviations), the analysis is performed for numerous data sets of different sample size (N). The noise introduced to the data generally leads to a systematic overestimation of magnitudes close to and above Mc. This fact causes an increase of the average number of events above Mc, which in turn leads to an apparent decrease of the b-value. This may result to a significant overestimation of seismicity rate even well above the actual completeness level. The b-value can in general be reliably estimated even for relatively small data sets (N < 1000) when only magnitudes higher than the actual completeness level are used. Nevertheless, a correction of the total number of events belonging in each magnitude class (i.e. 0.1 unit) should be considered, to deal with the magnitude uncertainty effect. Because magnitude uncertainties (here with the form of Gaussian noise) are inevitable in all instrumental catalogues, this finding is fundamental for seismicity rate and seismic hazard assessment analyses. Also important is that for some data analyses significant bias cannot necessarily be avoided by choosing a high Mc value for analysis. In such cases, there may be a risk of severe miscalculation of

  17. Rapid Moment Magnitude Estimation Using Strong Motion Derived Static Displacements

    OpenAIRE

    Muzli, Muzli; Asch, Guenter; Saul, Joachim; Murjaya, Jaya

    2015-01-01

    The static surface deformation can be recovered from strong motion records. Compared to satellite-based measurements such as GPS or InSAR, the advantage of strong motion records is that they have the potential to provide real-time coseismic static displacements. The use of these valuable data was optimized for the moment magnitude estimation. A centroid grid search method was introduced to calculate the moment magnitude by using1 model. The method to data sets was applied of the 2011...

  18. The magnitude of innovation and its evolution in social animals.

    Science.gov (United States)

    Arbilly, Michal; Laland, Kevin N

    2017-02-08

    Innovative behaviour in animals, ranging from invertebrates to humans, is increasingly recognized as an important topic for investigation by behavioural researchers. However, what constitutes an innovation remains controversial, and difficult to quantify. Drawing on a broad definition whereby any behaviour with a new component to it is an innovation, we propose a quantitative measure, which we call the magnitude of innovation , to describe the extent to which an innovative behaviour is novel. This allows us to distinguish between innovations that are a slight change to existing behaviours (low magnitude), and innovations that are substantially different (high magnitude). Using mathematical modelling and evolutionary computer simulations, we explored how aspects of social interaction, cognition and natural selection affect the frequency and magnitude of innovation. We show that high-magnitude innovations are likely to arise regularly even if the frequency of innovation is low, as long as this frequency is relatively constant, and that the selectivity of social learning and the existence of social rewards, such as prestige and royalties, are crucial for innovative behaviour to evolve. We suggest that consideration of the magnitude of innovation may prove a useful tool in the study of the evolution of cognition and of culture. © 2017 The Author(s).

  19. Iranian earthquakes, a uniform catalog with moment magnitudes

    Science.gov (United States)

    Karimiparidari, Sepideh; Zaré, Mehdi; Memarian, Hossein; Kijko, Andrzej

    2013-07-01

    A uniform earthquake catalog is an essential tool in any seismic hazard analysis. In this study, an earthquake catalog of Iran and adjacent areas was compiled, using international and national databanks. The following priorities were applied in selecting magnitude and earthquake location: (a) local catalogs were given higher priority for establishing the location of an earthquake and (b) global catalogs were preferred for determining earthquake magnitudes. Earthquakes that have occurred within the bounds between 23-42° N and 42-65° E, with a magnitude range of M W 3.5-7.9, from the third millennium BC until April 2010 were included. In an effort to avoid the "boundary effect," since the newly compiled catalog will be mainly used for seismic hazard assessment, the study area includes the areas adjacent to Iran. The standardization of the catalog in terms of magnitude was achieved by the conversion of all types of magnitude into moment magnitude, M W, by using the orthogonal regression technique. In the newly compiled catalog, all aftershocks were detected, based on the procedure described by Gardner and Knopoff (Bull Seismol Soc Am 64:1363-1367, 1974). The seismicity parameters were calculated for the six main tectonic seismic zones of Iran, i.e., the Zagros Mountain Range, the Alborz Mountain Range, Central Iran, Kope Dagh, Azerbaijan, and Makran.

  20. Changes in the timing and magnitude of floods in Canada

    International Nuclear Information System (INIS)

    Cunderlik, J.M.; Ouarda, T.B.M.J.

    2008-01-01

    It is expected that the global climate change will have significant impacts on the regime of hydrologic extremes. An increase in both the frequency and magnitude of hydrologic extremes is anticipated in the near future. As a consequence, the design and operation of water resource systems will have to adapt to the changing regime of hydrologic extremes. This study explores trends in the timing and magnitude of floods in natural streamflow gauging stations in Canada. The seasonality of floods is analyzed and the selected streamflow stations grouped into five flood seasonality regions. A common 30-year long observation period from 1974 to 2003 is used in the analysis to eliminate the effect of hydro-climatic variability in the timing and magnitude of floods resulting from different observation periods. The timing of floods is described in terms of directional statistics. A method is developed for analyzing trends in directional dates of flood occurrence that is not affected by the choice of zero direction. The magnitude of floods is analyzed by the annual maximum and peak-over-threshold methods. Trends in the timing and magnitude of floods are identified in each flood seasonality region using the Mann-Kendall nonparametric test, with a modification for auto-correlated data. The results show a good correspondence between the identified flood seasonality regions and the main terrestrial zones in Canada. Significant changes in the timing and magnitude of floods are found in the flood seasonality regions. (author)

  1. Estimation of the Magnitude of Excavation Damaged Zone at KURT

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Won Jin; Kim, Jin Sub; Lee, Changsoo; Cho, Heui Joo [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2013-10-15

    In the EDZ, the permeability of the rock increases. The annular EDZ surrounding the tunnel may act as a continuous and high-permeable pathway for the groundwater flow, which accelerates the intrusion of groundwater into the repository and increases the release of radionuclide into the biosphere from the repository. Therefore an investigation on the magnitude of the EDZ has been important from the viewpoint of mechanical stability and radiological safety for a geological repository. In this study, two in-situ measurements were performed at the KURT (KAERI Underground Research Tunnel) to investigate the magnitude of the EDZ. The magnitude of EDZ was estimated to be 0.6 to 1.8 m from the tunnel wall on the basis of the deformation modulus, and the value of deformation modulus in the EDZ is about 40% of those in undisturbed zone. The magnitude of EDZ can be estimated to be about 2 m from the viewpoint of permeability, and the permeabilities in the EDZ seem to be increased at up to 2 orders of magnitude compared with those in the intact rock. The magnitude of EDZ estimated based on the permeability is larger than that from the Goodman jack test.

  2. Analyses of surface motions caused by the magnitude 9.0 2004 Sumatra earthquake

    DEFF Research Database (Denmark)

    Khan, Shfaqat Abbas; Gudmundsson, Ó.

    The Sumatra, Indonesia, earthquake on December 26th was one of the most devastating earthquakes in history. With a magnitude of Mw = 9.0 it is the forth largest earthquake recorded since 1900. It occurred about one hundred kilometers off the west coast of northern Sumatra, where the relatively thin...... of years. The result was a devastating tsunami hitting coastlines across the Indian Ocean killing more than 225,000 people in Sri Lanka, India, Indonesia, Thailand and Malaysia. An earthquake of this magnitude is expected to involve a displacement on the fault on the order of 10 meters. But, what...... was the actual amplitude of the surface motions that triggered the tsunami? This can be constrained using the amplitudes of elastic waves radiated from the earthquake, or by direct measurements of deformation. Here we present estimates of the deformation based on continuous Global Positioning System (GPS...

  3. Radiation sterilization

    International Nuclear Information System (INIS)

    Jacobs, G.P.

    1989-01-01

    In view of the application of ionizing radiation to sterilize pharmaceutical products, and the particular advantages of using this mode of sterilization for powders for injection, which cannot be sterilized by more conventional methods, it is important to recognise the possibility of modification of radiation response of bacteria when in close contact with various drug powders. For this study, bacterial spores, which lend themselves to dessication, and which can be dried onto an inert powder matrix, were chosen as the test system. The results of this work indicate that the additives tested have a modest protective effect on the spores. However, when considering a bacterial inactivation for sterilization purposes of between six and ten orders of magnitude, that is, a desired sterility assurance level of an expected maximum probability of a product item being non-sterile of 10 -6 , then the slight protective effect observed in this study approaches insignificance

  4. Probable Maximum Earthquake Magnitudes for the Cascadia Subduction

    Science.gov (United States)

    Rong, Y.; Jackson, D. D.; Magistrale, H.; Goldfinger, C.

    2013-12-01

    The concept of maximum earthquake magnitude (mx) is widely used in seismic hazard and risk analysis. However, absolute mx lacks a precise definition and cannot be determined from a finite earthquake history. The surprising magnitudes of the 2004 Sumatra and the 2011 Tohoku earthquakes showed that most methods for estimating mx underestimate the true maximum if it exists. Thus, we introduced the alternate concept of mp(T), probable maximum magnitude within a time interval T. The mp(T) can be solved using theoretical magnitude-frequency distributions such as Tapered Gutenberg-Richter (TGR) distribution. The two TGR parameters, β-value (which equals 2/3 b-value in the GR distribution) and corner magnitude (mc), can be obtained by applying maximum likelihood method to earthquake catalogs with additional constraint from tectonic moment rate. Here, we integrate the paleoseismic data in the Cascadia subduction zone to estimate mp. The Cascadia subduction zone has been seismically quiescent since at least 1900. Fortunately, turbidite studies have unearthed a 10,000 year record of great earthquakes along the subduction zone. We thoroughly investigate the earthquake magnitude-frequency distribution of the region by combining instrumental and paleoseismic data, and using the tectonic moment rate information. To use the paleoseismic data, we first estimate event magnitudes, which we achieve by using the time interval between events, rupture extent of the events, and turbidite thickness. We estimate three sets of TGR parameters: for the first two sets, we consider a geographically large Cascadia region that includes the subduction zone, and the Explorer, Juan de Fuca, and Gorda plates; for the third set, we consider a narrow geographic region straddling the subduction zone. In the first set, the β-value is derived using the GCMT catalog. In the second and third sets, the β-value is derived using both the GCMT and paleoseismic data. Next, we calculate the corresponding mc

  5. Radicalización y diferencia: ¿Hacia una nueva bipolaridad?

    OpenAIRE

    Rogado, Jesús

    2009-01-01

    Review Essay de:GRAY, John, Black Mass. Apocalyptic Religion and the Death of Utopia, Ed. Farrar, Straus and Giroux, Nueva York, 2007. KAGAN, Robert, El retorno de la historia y el fin de los sueños, Ed. Taurus-Santillana, Madrid, 2008. TODOROV, Tzvetan, El miedo a los bárbaros, Ed. Círculo de Lectores, Barcelona, 2008.

  6. Espacio geográfico y ciencias sociales. Nuevas propuestas para el estudio del territorio

    OpenAIRE

    Joaquín Bosque Sendra

    2005-01-01

    El desarrollo de la Ciencia de la información geográfica, de la Geocomputación y de una Ciencia social espacialmente integrada ofrece nuevas e interesantes perspectivas para el estudio de los problemas territoriales. En este trabajo se describen estas tres iniciativas y se reflexiona sobre sus posibilidades para integrar las diversas ciencias sociales.

  7. Neuromarketing: Nuevas fronteras de la investigación de mercados

    OpenAIRE

    Sutil Martín, Dolores Lucía

    2012-01-01

    Conferencia realizada en los "Lunes de Comercio" por la Cátedra de Comercio de la Universidad de la Rioja el día 15 de Octubre de 2012 Muestra las nuevas tendencias de la investigación de mercados con los avances de la neurociencia. Economía de la Empresa

  8. Espacio geográfico y ciencias sociales. Nuevas propuestas para el estudio del territorio

    Directory of Open Access Journals (Sweden)

    Joaquín Bosque Sendra

    2005-06-01

    Full Text Available El desarrollo de la Ciencia de la información geográfica, de la Geocomputación y de una Ciencia social espacialmente integrada ofrece nuevas e interesantes perspectivas para el estudio de los problemas territoriales. En este trabajo se describen estas tres iniciativas y se reflexiona sobre sus posibilidades para integrar las diversas ciencias sociales.

  9. UNA NUEVA COMBINACIÓN Y NUEVOS REGISTROS EN LAS BROMELIACEAE DE EL SALVADOR

    Directory of Open Access Journals (Sweden)

    J. Francisco Morales

    2009-01-01

    Full Text Available Se propone una nueva combinación, Werauhia montana y se discuten sus relaciones con W. nephrolepis. Además se registra por primera vez, la presencia de Aechmea bromeliifolia, Pitcairnia maidifolia y Tillandsia balbisiana para El Salvador.

  10. UNA ESPECIE NUEVA DE MYRCIA (MYRTACEAE Y NUEVOS REGISTROS DE LA FAMILIA PARA COLOMBIA

    Directory of Open Access Journals (Sweden)

    CARLOS PARRA-O.

    2013-12-01

    Full Text Available Se describe e ilustra una especie nueva de Myrcia (Myrtaceae para los Andes de Colombia. Se discuten las afinidades taxonómicas del nuevo taxón dentro de las Myrtaceae colombianas. Adicionalmente, se presentan cinco nuevos registros de Myrtaceae para la flora nativa colombiana.

  11. ESTRATEGIAS Y DESEMPEÑO DE LAS NUEVAS Y EMERGENTES EMPRESAS MULTINACIONALES MEXIANAS

    Directory of Open Access Journals (Sweden)

    José G. Vargas-Hernández

    2010-11-01

    Full Text Available El artículo analiza las nuevas empresas emergentes multinacionales mexicanas (MexEMNEs en el mercado global. Se analizan sus estrategias y desempeño para determinar perfiles y futuros escenarios de desarrollo. Se concluye que la innovación es clave para buscar ventajas y oportunidades en el cambio.

  12. Hallazgo de plantas nuevas o raras en Vizcaya = Discovery of news or rare plants in Biscay

    Directory of Open Access Journals (Sweden)

    J.J. Barredo Pérez

    2005-01-01

    Full Text Available Se citan once táxones interesantes de la flora vascular de Vizcaya, de ellos, cinco son aloctonas nuevas para Vizcaya -tres de ellas lo son también para la Comunidad Autónoma del País Vasco (CAPV - y de otras seis consideradas raras o muy raras en esta provincia atlántica.

  13. What controls the maximum magnitude of injection-induced earthquakes?

    Science.gov (United States)

    Eaton, D. W. S.

    2017-12-01

    Three different approaches for estimation of maximum magnitude are considered here, along with their implications for managing risk. The first approach is based on a deterministic limit for seismic moment proposed by McGarr (1976), which was originally designed for application to mining-induced seismicity. This approach has since been reformulated for earthquakes induced by fluid injection (McGarr, 2014). In essence, this method assumes that the upper limit for seismic moment release is constrained by the pressure-induced stress change. A deterministic limit is given by the product of shear modulus and the net injected fluid volume. This method is based on the assumptions that the medium is fully saturated and in a state of incipient failure. An alternative geometrical approach was proposed by Shapiro et al. (2011), who postulated that the rupture area for an induced earthquake falls entirely within the stimulated volume. This assumption reduces the maximum-magnitude problem to one of estimating the largest potential slip surface area within a given stimulated volume. Finally, van der Elst et al. (2016) proposed that the maximum observed magnitude, statistically speaking, is the expected maximum value for a finite sample drawn from an unbounded Gutenberg-Richter distribution. These three models imply different approaches for risk management. The deterministic method proposed by McGarr (2014) implies that a ceiling on the maximum magnitude can be imposed by limiting the net injected volume, whereas the approach developed by Shapiro et al. (2011) implies that the time-dependent maximum magnitude is governed by the spatial size of the microseismic event cloud. Finally, the sample-size hypothesis of Van der Elst et al. (2016) implies that the best available estimate of the maximum magnitude is based upon observed seismicity rate. The latter two approaches suggest that real-time monitoring is essential for effective management of risk. A reliable estimate of maximum

  14. The Strain Energy, Seismic Moment and Magnitudes of Large Earthquakes

    Science.gov (United States)

    Purcaru, G.

    2004-12-01

    The strain energy Est, as potential energy, released by an earthquake and the seismic moment Mo are two fundamental physical earthquake parameters. The earthquake rupture process ``represents'' the release of the accumulated Est. The moment Mo, first obtained in 1966 by Aki, revolutioned the quantification of earthquake size and led to the elimination of the limitations of the conventional magnitudes (originally ML, Richter, 1930) mb, Ms, m, MGR. Both Mo and Est, not in a 1-to-1 correspondence, are uniform measures of the size, although Est is presently less accurate than Mo. Est is partitioned in seismic- (Es), fracture- (Eg) and frictional-energy Ef, and Ef is lost as frictional heat energy. The available Est = Es + Eg (Aki and Richards (1980), Kostrov and Das, (1988) for fundamentals on Mo and Est). Related to Mo, Est and Es, several modern magnitudes were defined under various assumptions: the moment magnitude Mw (Kanamori, 1977), strain energy magnitude ME (Purcaru and Berckhemer, 1978), tsunami magnitude Mt (Abe, 1979), mantle magnitude Mm (Okal and Talandier, 1987), seismic energy magnitude Me (Choy and Boatright, 1995, Yanovskaya et al, 1996), body-wave magnitude Mpw (Tsuboi et al, 1998). The available Est = (1/2μ )Δ σ Mo, Δ σ ~=~average stress drop, and ME is % \\[M_E = 2/3(\\log M_o + \\log(\\Delta\\sigma/\\mu)-12.1) ,\\] % and log Est = 11.8 + 1.5 ME. The estimation of Est was modified to include Mo, Δ and μ of predominant high slip zones (asperities) to account for multiple events (Purcaru, 1997): % \\[E_{st} = \\frac{1}{2} \\sum_i {\\frac{1}{\\mu_i} M_{o,i} \\Delta\\sigma_i} , \\sum_i M_{o,i} = M_o \\] % We derived the energy balance of Est, Es and Eg as: % \\[ E_{st}/M_o = (1+e(g,s)) E_s/M_o , e(g,s) = E_g/E_s \\] % We analyzed a set of about 90 large earthquakes and found that, depending on the goal these magnitudes quantify differently the rupture process, thus providing complementary means of earthquake characterization. Results for some

  15. Cultura organizacional e identidad en la nueva competitividad

    Directory of Open Access Journals (Sweden)

    José Ernesto Ramírez

    1998-12-01

    segmentación salarial y de las identidades;. 2 la migración condicionada de los empleados a la normatividad contenida en la reforma laboral promulgada en 1990; 3 el desmonte de preferencias de selección y contratación de trabajadores en los distintos niveles; 4 la creación y fortalecimiento de departamentos de comunicaciones internas; 5 la aplicación sistemática de instrumentos de medición y seguimiento a la evolución del clima laboral alternando énfasis de tipo comportamentalista o del tipo estandarización; 6 una nueva estratificación sociolaboral entre operarios precompetitivos menos calificados y empíricos, con promedio elevado de antigüedad -sin-dicalizados-; técnicos y personal polivalente calificado y multihábíl sub- contratados; y empleados profesionales calificados, estos dos últimos estratos poco sindícalizados; 7 mantenimiento de patrones de centralización -en algunos casos, personal- de la toma de decisiones. La diferenciación de prácticas culturales se expresa en manifestaciones matizadas intra e interempresaríalmente, en aspectos como la distribución de la autoridad, el sentido dado a los cambios, la función de los sistemas de comunicación y los ordenamientos simbólicos de las organizaciones. Los nuevos conflictos culturales tendrían como factores determinantes 1 el impacto de la trasculturalización empresarial; 2 el paso de prácticas que generaban identidad como algo que sucedía espontáneamente a la generalización de prácticas de construcción de identidades particulares como interiorización; 3 las perspectivas y "visiones de la dirección" determinando los estilos de liderazgo; 4 la tendencia al cambio en la concepción del tiempo; 5 creciente informatización del control personal. Simultáneamente, la capacidad movilizatoria de distintos instrumentos de "reforma cultural" utilizados ha derivado en una creciente ideologización de la empresa, como espacios pletóricos de pautas valorativas homogenizantes. La investigaci

  16. Magnitudes and units in the X-ray dosimetry in diagnostic radiology

    International Nuclear Information System (INIS)

    Tovar M, V. M.; Cejudo A, J.; Vergara M, F.

    2009-10-01

    The dosimetry objective in the radiological image is the quantification from the exposition to the radiation with a commitment of optimizing the image quality to the reason of the absorbed dose. The dosimetry has the meaning of avoiding excessive dose that could imply a significant risk of deterministic effects induction. The dosimetric magnitudes and dosimetry protocols in the radiological image, are those that are related to the risks for the patient. Exist in diagnostic radiology two fundamentals reason to measure or to estimate the patient radiation dose. First, the mensurations are a means to verify the good practices and an aid to the optimization of the patient protection. Second, the absorbed dose estimation to tissues and organs in the patient are necessary to determine the risks, and this way to indicate that the radiological techniques employees can be justified and in investigated cases of over exposition. (Author)

  17. Magnitude corrections for attenuation in the upper mantle

    International Nuclear Information System (INIS)

    Anon.

    1978-01-01

    Since 1969, a consistent discrepancy in seismic magnitudes of nuclear detonations at NTS compared with magnitudes of detonations elsewhere in the world has been observed. This discrepancy can be explained in terms of a relatively high seismic attenuation for compressional waves in the upper mantle beneath the NTS and in certain other locations. A correction has been developed for this attenuation based on a relationship between the velocity of compressional waves at the top of the earth's mantle (just beneath the Mohorovicic discontinuity) and the seismic attenuation further down in the upper mantle. Our new definition of body-wave magnitude includes corrections for attenuation in the upper mantle at both ends of the teleseismic body-wave path. These corrections bring the NTS oservations into line with measurements of foreign events, and enable one to make more reliable estimates of yields of underground nuclear explosions, wherever the explosion occurs

  18. Magnitude and duration of stretch modulate fibroblast remodeling.

    Science.gov (United States)

    Balestrini, Jenna L; Billiar, Kristen L

    2009-05-01

    Mechanical cues modulate fibroblast tractional forces and remodeling of extracellular matrix in healthy tissue, healing wounds, and engineered matrices. The goal of the present study is to establish dose-response relationships between stretch parameters (magnitude and duration per day) and matrix remodeling metrics (compaction, strength, extensibility, collagen content, contraction, and cellularity). Cyclic equibiaxial stretch of 2-16% was applied to fibroblast-populated fibrin gels for either 6 h or 24 h/day for 8 days. Trends in matrix remodeling metrics as a function of stretch magnitude and duration were analyzed using regression analysis. The compaction and ultimate tensile strength of the tissues increased in a dose-dependent manner with increasing stretch magnitude, yet remained unaffected by the duration in which they were cycled (6 h/day versus 24 h/day). Collagen density increased exponentially as a function of both the magnitude and duration of stretch, with samples stretched for the reduced duration per day having the highest levels of collagen accumulation. Cell number and failure tension were also dependent on both the magnitude and duration of stretch, although stretch-induced increases in these metrics were only present in the samples loaded for 6 h/day. Our results indicate that both the magnitude and the duration per day of stretch are critical parameters in modulating fibroblast remodeling of the extracellular matrix, and that these two factors regulate different aspects of this remodeling. These findings move us one step closer to fully characterizing culture conditions for tissue equivalents, developing improved wound healing treatments and understanding tissue responses to changes in mechanical environments during growth, repair, and disease states.

  19. Color-magnitude relations in nearby galaxy clusters

    Science.gov (United States)

    Rasheed, Mariwan A.; Mohammad, Khalid K.

    2018-06-01

    The rest-frame (g-r) /Mr color-magnitude relations of 12 Abell-type clusters are analyzed in the redshift range (0.02≲ z ≲ 0.10) and within a projected radius of 0.75 Mpc using photometric data from SDSS-DR9. We show that the color-magnitude relation parameters (slope, zero-point, and scatter) do not exhibit significant evolution within this low-redshift range. Thus, we can say that during the look-back time of z ˜ 0.1 all red sequence galaxies evolve passively, without any star formation activity.

  20. High-magnitude head impact exposure in youth football

    Science.gov (United States)

    Campolettano, Eamon T.; Gellner, Ryan A.; Rowson, Steven

    2018-01-01

    OBJECTIVE Even in the absence of a clinically diagnosed concussion, research suggests that neurocognitive changes may develop in football players as a result of frequent head impacts that occur during football games and practices. The objectives of this study were to determine the specific situations in which high-magnitude impacts (accelerations exceeding 40g) occur in youth football games and practices and to assess how representative practice activities are of games with regard to high-magnitude head impact exposure. METHODS A total of 45 players (mean age 10.7 ± 1.1 years) on 2 youth teams (Juniors [mean age 9.9 ± 0.6 years; mean body mass 38.9 ± 9.9 kg] and Seniors [mean age 11.9 ± 0.6 years; mean body mass 51.4 ± 11.8 kg]) wore helmets instrumented with accelerometer arrays to record head impact accelerations for all practices and games. Video recordings from practices and games were used to verify all high-magnitude head impacts, identify specific impact characteristics, and determine the amount of time spent in each activity. RESULTS A total of 7590 impacts were recorded, of which 571 resulted in high-magnitude head impact accelerations exceeding 40g (8%). Impacts were characterized based on the position played by the team member who received the impact, the part of the field where the impact occurred, whether the impact occurred during a game or practice play, and the cause of the impact. High-magnitude impacts occurred most frequently in the open field in both games (59.4%) and practices (67.5%). “Back” position players experienced a greater proportion of high-magnitude head impacts than players at other positions. The 2 teams in this study structured their practice sessions similarly with respect to time spent in each drill, but impact rates differed for each drill between the teams. CONCLUSIONS High-magnitude head impact exposure in games and practice drills was quantified and used as the basis for comparison of exposure in the 2 settings. In

  1. Image reconstruction from pairs of Fourier-transform magnitude

    International Nuclear Information System (INIS)

    Hunt, B.R.; Overman, T.L.; Gough, P.

    1998-01-01

    The retrieval of phase information from only the magnitude of the Fourier transform of a signal remains an important problem for many applications. We present an algorithm for phase retrieval when there exist two related sets of Fourier-transform magnitude data. The data are assumed to come from a single object observed in two different polarizations through a distorting medium, so the phase component of the Fourier transform of the object is corrupted. Phase retrieval is accomplished by minimization of a suitable criterion function, which can take three different forms. copyright 1998 Optical Society of America

  2. Improving Children's Knowledge of Fraction Magnitudes

    Science.gov (United States)

    Fazio, Lisa K.; Kennedy, Casey A.; Siegler, Robert S.

    2016-01-01

    We examined whether playing a computerized fraction game, based on the integrated theory of numerical development and on the Common Core State Standards' suggestions for teaching fractions, would improve children's fraction magnitude understanding. Fourth and fifth-graders were given brief instruction about unit fractions and played "Catch…

  3. Lower bound earthquake magnitude for probabilistic seismic hazard evaluation

    International Nuclear Information System (INIS)

    McCann, M.W. Jr.; Reed, J.W.

    1990-01-01

    This paper presents the results of a study that develops an engineering and seismological basis for selecting a lower-bound magnitude (LBM) for use in seismic hazard assessment. As part of a seismic hazard analysis the range of earthquake magnitudes that are included in the assessment of the probability of exceedance of ground motion must be defined. The upper-bound magnitude is established by earth science experts based on their interpretation of the maximum size of earthquakes that can be generated by a seismic source. The lower-bound or smallest earthquake that is considered in the analysis must also be specified. The LBM limits the earthquakes that are considered in assessing the probability that specified ground motion levels are exceeded. In the past there has not been a direct consideration of the appropriate LBM value that should be used in a seismic hazard assessment. This study specifically looks at the selection of a LBM for use in seismic hazard analyses that are input to the evaluation/design of nuclear power plants (NPPs). Topics addressed in the evaluation of a LBM are earthquake experience data at heavy industrial facilities, engineering characteristics of ground motions associated with small-magnitude earthquakes, probabilistic seismic risk assessments (seismic PRAs), and seismic margin evaluations. The results of this study and the recommendations concerning a LBM for use in seismic hazard assessments are discussed. (orig.)

  4. Magnitude of stress and academic achievement of female students ...

    African Journals Online (AJOL)

    Stress is a universal phenomenon which no human being is free from. This paper examined the magnitude of stress and academic achievement of female students of the University of Ilorin. It was a description survey type. The target population comprised the 400 level female students from the four randomly selected ...

  5. Sequential sampling, magnitude estimation, and the wisdom of crowds

    DEFF Research Database (Denmark)

    Nash, Ulrik W.

    2017-01-01

    in the wisdom of crowds indicated by judgment distribution skewness. The present study reports findings from an experiment on magnitude estimation and supports these predictions. The study moreover demonstrates that systematic errors by groups of people can be corrected using information about the judgment...

  6. A catalog of observed nuclear magnitudes of Jupiter family comets

    Science.gov (United States)

    Tancredi, G.; Fernández, J. A.; Rickman, H.; Licandro, J.

    2000-10-01

    A catalog of a sample of 105 Jupiter family (JF) comets (defined as those with Tisserand constants T > 2 and orbital periods P International Comet Quarterly Archive of Cometary Photometric Data, the Minor Planet Center (MPC) data base, IAU Circulars, International Comet Quarterly, and a few papers devoted to some particular comets, together with our own observations. Photometric data previous to 1990 have mainly been taken from the Comet Light Curve Catalogue (CLICC) compiled by Kamél (\\cite{kamel}). We discuss the reliability of the reported nuclear magnitudes in relation to the inherent sources of errors and uncertainties, in particular the coma contamination often present even at large heliocentric distances. A large fraction of the JF comets of our sample indeed shows various degrees of activity at large heliocentric distances, which is correlated with recent downward jumps in their perihelion distances. The reliability of coma subtraction methods to compute the nuclear magnitude is also discussed. Most absolute nuclear magnitudes are found in the range 15 - 18, with no magnitudes fainter than H_N ~ 19.5. The catalog can be found at: http://www.fisica.edu.uy/ ~ gonzalo/catalog/. Table 2 and Appendix B are only available in electronic form at http://www.edpsciences.org Table 5 is also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

  7. Magnitude and predictors of excessive alcohol use in Ethiopia ...

    African Journals Online (AJOL)

    user

    11Harvard T.H. Chan School of Public Health, Harvard University, E-mail: ST: solomon.teferra@gmail.com USA. Magnitude ..... cigarettes while drinking (34). ... Addiction. 2011;106(10):. 1718–24. 3. Alcohol an Obstacle to Development in East.

  8. The Magnitude of Obesity and its Relationship to Blood Pressure ...

    African Journals Online (AJOL)

    Background: Obesity in developing nations is no longer as uncommon as it was thought to be decades ago however paucity of data on the burden of obesity from urban communities was observed by previous workers. Aim: To determine the magnitude of obesity and its relationship to blood pressure among urban adult ...

  9. Magnitude and gender distribution of obesity and abdominal ...

    African Journals Online (AJOL)

    Background: Obesity and abdominal adiposity are associated with increased cardiovascular morbidity in diabetes. This study evaluated their magnitude and gender distribution in Nigerians with Type 2 DM attending a tertiary care clinic. Patients and Methods: 258 consecutive patients with type 2 DM were evaluated.

  10. Extremal Regions Detection Guided by Maxima of Gradient Magnitude

    DEFF Research Database (Denmark)

    Faraji, Mehdi; Shambezadeh, Jamshid; Nasrollahi, Kamal

    2015-01-01

    boundaries we introduce Maxima of Gradient Magnitudes (MGMs) which are shown to be points that are mostly around the boundaries of the regions. Having found the MGMs, the method obtains a Global Criterion (GC) for each level of the input image which is used to find Extremum Levels (ELs). The found ELs...

  11. Magnitude and correlates of moderate to severe anemia among ...

    African Journals Online (AJOL)

    Introduction: Moderate to severe anemia is an important clinical problem in HIV patients on Highly Active Antiretroviral Therapy. The rate of progression and mortality in this sub group of patients is high compared to non anemic patients. In sub Saharan Africa with scale up of Anti retroviral therapy, the magnitude of this ...

  12. The magnitude-redshift relation in a perturbed Friedmann universe

    International Nuclear Information System (INIS)

    Sasaki, Misao.

    1987-02-01

    A general formula for the magnitude-redshift relation in a linearly perturbed Friedmann universe is derived. The formula does not assume any specific gauge condition, but the gauge-invariance of it is explicitly shown. Then the application of the formula to the spatially flat background model is considered and the implications are discussed. (author)

  13. Determining on-fault earthquake magnitude distributions from integer programming

    Science.gov (United States)

    Geist, Eric L.; Parsons, Thomas E.

    2018-01-01

    Earthquake magnitude distributions among faults within a fault system are determined from regional seismicity and fault slip rates using binary integer programming. A synthetic earthquake catalog (i.e., list of randomly sampled magnitudes) that spans millennia is first formed, assuming that regional seismicity follows a Gutenberg-Richter relation. Each earthquake in the synthetic catalog can occur on any fault and at any location. The objective is to minimize misfits in the target slip rate for each fault, where slip for each earthquake is scaled from its magnitude. The decision vector consists of binary variables indicating which locations are optimal among all possibilities. Uncertainty estimates in fault slip rates provide explicit upper and lower bounding constraints to the problem. An implicit constraint is that an earthquake can only be located on a fault if it is long enough to contain that earthquake. A general mixed-integer programming solver, consisting of a number of different algorithms, is used to determine the optimal decision vector. A case study is presented for the State of California, where a 4 kyr synthetic earthquake catalog is created and faults with slip ≥3 mm/yr are considered, resulting in >106  variables. The optimal magnitude distributions for each of the faults in the system span a rich diversity of shapes, ranging from characteristic to power-law distributions. 

  14. Working Memory Strategies during Rational Number Magnitude Processing

    Science.gov (United States)

    Hurst, Michelle; Cordes, Sara

    2017-01-01

    Rational number understanding is a critical building block for success in more advanced mathematics; however, how rational number magnitudes are conceptualized is not fully understood. In the current study, we used a dual-task working memory (WM) interference paradigm to investigate the dominant type of strategy (i.e., requiring verbal WM…

  15. Estimating the magnitude of food waste generated in South Africa

    CSIR Research Space (South Africa)

    Oelofse, Suzanna HH

    2012-08-01

    Full Text Available Throughout the developed world, food is treated as a disposable commodity. Between one third and half of all food produced for human consumption globally is estimated to be wasted. However, attempts to quantify the actual magnitude of food wasted...

  16. Temporal Order Judgment Reveals How Number Magnitude Affects Visuospatial Attention

    Science.gov (United States)

    Casarotti, Marco; Michielin, Marika; Zorzi, Marco; Umilta, Carlo

    2007-01-01

    The existence of spatial components in the mental representation of number magnitude has raised the question regarding the relation between numbers and spatial attention. We present six experiments in which this relation was examined using a temporal order judgment task to index attentional allocation. Results demonstrate that one important…

  17. Analytical review of the magnitude and causes maternal death at ...

    African Journals Online (AJOL)

    Background: Tanzania is one of the countries with the highest maternal mortalities in the word and sub Saharan Africa. However, recently there have been reports of a downward trend of this tragedy in Tanzania. Objectives: This study was done to determine the magnitude and the causes of maternal deaths at Dodoma ...

  18. Representation of numerical magnitude in math-anxious individuals.

    Science.gov (United States)

    Colomé, Àngels

    2018-01-01

    Larger distance effects in high math-anxious individuals (HMA) performing comparison tasks have previously been interpreted as indicating less precise magnitude representation in this population. A recent study by Dietrich, Huber, Moeller, and Klein limited the effects of math anxiety to symbolic comparison, in which they found larger distance effects for HMA, despite equivalent size effects. However, the question of whether distance effects in symbolic comparison reflect the properties of the magnitude representation or decisional processes is currently under debate. This study was designed to further explore the relation between math anxiety and magnitude representation through three different tasks. HMA and low math-anxious individuals (LMA) performed a non-symbolic comparison, in which no group differences were found. Furthermore, we did not replicate previous findings in an Arabic digit comparison, in which HMA individuals showed equivalent distance effects to their LMA peers. Lastly, there were no group differences in a counting Stroop task. Altogether, an explanation of math anxiety differences in terms of less precise magnitude representation is not supported.

  19. Strategy Use and Strategy Choice in Fraction Magnitude Comparison

    Science.gov (United States)

    Fazio, Lisa K.; DeWolf, Melissa; Siegler, Robert S.

    2016-01-01

    We examined, on a trial-by-trial basis, fraction magnitude comparison strategies of adults with more and less mathematical knowledge. College students with high mathematical proficiency used a large variety of strategies that were well tailored to the characteristics of the problems and that were guaranteed to yield correct performance if executed…

  20. Passive seismic monitoring at the ketzin CCS site -Magnitude estimation

    NARCIS (Netherlands)

    Paap, B.F.; Steeghs, T.P.H.

    2014-01-01

    In order to allow quantification of the strength of local micro-seismic events recorded at the CCS pilot site in Ketzin in terms of local magnitude, earthquake data recorded by standardized seismometers were used. Earthquakes were selected that occurred in Poland and Czech Republic and that were

  1. The colour-magnitude diagram of NGC 5053

    International Nuclear Information System (INIS)

    Walker, M.F.; Pike, C.D.; McGee, J.D.

    1976-01-01

    The colour-magnitude diagram of NGC 5053 has been derived to V = 21.1 from photographic and electronographic observations. The electronographic observations were obtained with an experimental Spectracon image-converter, having photocathode and exit window dimensions of 20 x 30 mm, mounted at the prime-focus of the 120-in. Lick reflector. The photographic observations were obtained with the 20-in. Carnegie astrograph and the 36-in. Crossley reflector. The colour-magnitude diagram resembles that of M92, with the difference that a red horizontal branch is more pronounced than the asymptotic branch in NGC 5053. The topology of the horizontal branch is that of clusters with an intermediate metal content and is thus at variance with the mean period of the RR Lyr stars and the unreddened colour of the subgiant branch read at the magnitude level of the horizontal branch, both of which would indicate an extremely low metal content. If comparison of the colour-magnitude diagrams of NGC 5053 and M92 is valid, then the reddening of NGC 5053 is Esub(B-V) = 0.02 and the apparent distance modulus is m-M = 16.08 +- 0.08. (author)

  2. Magnitude, precision, and realism of depth perception in stereoscopic vision.

    Science.gov (United States)

    Hibbard, Paul B; Haines, Alice E; Hornsey, Rebecca L

    2017-01-01

    Our perception of depth is substantially enhanced by the fact that we have binocular vision. This provides us with more precise and accurate estimates of depth and an improved qualitative appreciation of the three-dimensional (3D) shapes and positions of objects. We assessed the link between these quantitative and qualitative aspects of 3D vision. Specifically, we wished to determine whether the realism of apparent depth from binocular cues is associated with the magnitude or precision of perceived depth and the degree of binocular fusion. We presented participants with stereograms containing randomly positioned circles and measured how the magnitude, realism, and precision of depth perception varied with the size of the disparities presented. We found that as the size of the disparity increased, the magnitude of perceived depth increased, while the precision with which observers could make depth discrimination judgments decreased. Beyond an initial increase, depth realism decreased with increasing disparity magnitude. This decrease occurred well below the disparity limit required to ensure comfortable viewing.

  3. Magnitude and predictors of excessive alcohol use in Ethiopia ...

    African Journals Online (AJOL)

    Magnitude and predictors of excessive alcohol use in Ethiopia: Findings from the 2015 national non-communicable diseases STEPS survey. ... overall prevalence of lifetime alcohol consumption was 49.3%, and 40.7% of the study participants reported consumption of alcohol in the past 30 days, defined as current drinkers.

  4. Automated method for determining location and magnitude of leaks inside a PWR containment

    International Nuclear Information System (INIS)

    Cho, J.H.; Elia, F.A. Jr.

    1986-01-01

    Thermal-hydraulics analysis can be used to determine location and magnitude of leaks inside a pressurized water reactor (PWR) containment, as required by plant technical specifications. The major advantage of this detection method is that it minimizes radiation exposure of maintenance personnel because most of the leak detection process is performed from the control room outside the containment. In addition, such a program allows for the elimination of pipe whip restraints and jet impingement shields, eliminating costs for maintenance of these supports and shields in older plants and lowering construction costs for new plants. Previously, only simple single-node containment models were used for determining leakage magnitude. This paper presents a more sophisticated multinode approach for determining the magnitude and location. The resulting sensitivities to leak can be programmed into the plant's computer system. In this way, the plant's computer will be able to measure and locate leaks inside containment. The study concludes that dew point temperature (or relative humidity) is the most suitable parameter for locating a leak while flow rate to sump is the most suitable parameter for quantifying the leak

  5. Individual Movement Variability Magnitudes Are Explained by Cortical Neural Variability.

    Science.gov (United States)

    Haar, Shlomi; Donchin, Opher; Dinstein, Ilan

    2017-09-13

    Humans exhibit considerable motor variability even across trivial reaching movements. This variability can be separated into specific kinematic components such as extent and direction that are thought to be governed by distinct neural processes. Here, we report that individual subjects (males and females) exhibit different magnitudes of kinematic variability, which are consistent (within individual) across movements to different targets and regardless of which arm (right or left) was used to perform the movements. Simultaneous fMRI recordings revealed that the same subjects also exhibited different magnitudes of fMRI variability across movements in a variety of motor system areas. These fMRI variability magnitudes were also consistent across movements to different targets when performed with either arm. Cortical fMRI variability in the posterior-parietal cortex of individual subjects explained their movement-extent variability. This relationship was apparent only in posterior-parietal cortex and not in other motor system areas, thereby suggesting that individuals with more variable movement preparation exhibit larger kinematic variability. We therefore propose that neural and kinematic variability are reliable and interrelated individual characteristics that may predispose individual subjects to exhibit distinct motor capabilities. SIGNIFICANCE STATEMENT Neural activity and movement kinematics are remarkably variable. Although intertrial variability is rarely studied, here, we demonstrate that individual human subjects exhibit distinct magnitudes of neural and kinematic variability that are reproducible across movements to different targets and when performing these movements with either arm. Furthermore, when examining the relationship between cortical variability and movement variability, we find that cortical fMRI variability in parietal cortex of individual subjects explained their movement extent variability. This enabled us to explain why some subjects

  6. Magnitude and pattern of Arctic warming governed by the seasonality of radiative forcing

    NARCIS (Netherlands)

    Bintanja, R.; Krikken, F.

    2016-01-01

    Observed and projected climate warming is strongest in the Arctic regions, peaking in autumn/winter. Attempts to explain this feature have focused primarily on identifying the associated climate feedbacks, particularly the ice-Albedo and lapse-rate feedbacks. Here we use a state-of-The-Art global

  7. Solid state radiation detector system

    International Nuclear Information System (INIS)

    1977-01-01

    A solid state radiation flux detector system utilizes a detector element, consisting of a bar of semiconductor having electrical conductance of magnitude dependent upon the magnitude of photon and charged particle flux impinging thereon, and negative feedback circuitry for adjusting the current flow through a light emitting diode to facilitate the addition of optical flux, having a magnitude decreasing in proportion to any increase in the magnitude of radiation (e.g. x-ray) flux incident upon the detector element, whereby the conductance of the detector element is maintained essentially constant. The light emitting diode also illuminates a photodiode to generate a detector output having a stable, highly linear response with time and incident radiation flux changes

  8. Magnitudes and Moment-Duration Scaling of Low-Frequency Earthquakes Beneath Southern Vancouver Island

    Science.gov (United States)

    Bostock, M. G.; Thomas, A.; Rubin, A. M.; Savard, G.; Chuang, L. Y.

    2015-12-01

    We employ 130 low-frequency-earthquake (LFE) templates representing tremor sources on the plate boundary below southern Vancouver Island to examine LFE magnitudes. Each template is assembled from 100's to 1000's of individual LFEs, representing over 300,000 independent detections from major episodic-tremor-and- slip (ETS) events between 2003 and 2013. Template displacement waveforms for direct P- and S-waves at near epicentral distances are remarkably simple at many stations, approaching the zero-phase, single pulse expected for a point dislocation source in a homogeneous medium. High spatio-temporal precision of template match-filtered detections facilitates precise alignment of individual LFE detections and analysis of waveforms. Upon correction for 1-D geometrical spreading, attenuation, free-surface magnification and radiation pattern, we solve a large, sparse linear system for 3-D path corrections and LFE magnitudes for all detections corresponding to a single ETS template. The spatio-temporal distribution of magnitudes indicates that typically half the total moment release occurs within the first 12-24 hours of LFE activity during an ETS episode when tidal sensitity is low. The remainder is released in bursts over several days, particularly as spatially extensive RTRs, during which tidal sensitivity is high. RTR's are characterized by large magnitude LFEs, and are most strongly expressed in the updip portions of the ETS transition zone and less organized at downdip levels. LFE magnitude-frequency relations are better described by power-law than exponential distributions although they exhibit very high b-values ≥ 6. We examine LFE moment-duration scaling by generating templates using detections for limiting magnitude ranges MW<1.5, MW≥ 2.0. LFE duration displays a weaker dependence upon moment than expected for self-similarity, suggesting that LFE asperities are limited in dimension and that moment variation is dominated by slip. This behaviour implies

  9. Ultraviolet radiation

    International Nuclear Information System (INIS)

    Faber, M.

    1989-01-01

    Although UV radiation can arise from a large number of man-made sources, the sun is the main source and both the general public and people working out of doors will be exposed to it. This natural background radiation and the variations in its magnitude must be taken into account when exposure limits are discussed. The full extent to which UV affects human well-being is difficult to quantify. Artificially produced UV has, however, been used in mines and cellars and in far northern latitudes as a supplement to combat functional impairment among people. Many of the observed effects, such as a decrease in the incidence of infectious diseases and in absenteeism, may be due to the bactericidal nature of the radiation. On the other hand, large doses of UV have an acute destructive effect on the skin and eye. Doses so low that they give rise only to normally acceptable or even desirable acute effects can, if repeated, induce changes resulting in late effects such as elastosis of the skin, keratosis and skin cancers. These effects will be of greater significance in people with lightly pigmented skin. 130 refs, 13 figs, 2 tabs

  10. MOVIMIENTOS SOCIALES Y NUEVAS PRÁCTICAS POLÍTICAS EN ARGENTINA. LAS ORGANIZACIONES PIQUETERAS

    Directory of Open Access Journals (Sweden)

    Maristella Svampa

    2004-01-01

    Full Text Available En la Argentina de la última década emergieron nuevas formas de organización política y acción colectiva cuyas marcas mayores son la acción directa, la auto-organización y una importante dinámica asamblearia. Tres tipos de experiencias ilustran de manera diferente estas nuevas prácticas: las agrupaciones piqueteras (desocupados, las asambleas barriales y las fábricas recuperadas por sus trabajadores. Este artículo abordará algunos de los aspectos novedosos que presenta uno de estos movimientos, el que sin duda constituye, por encima de su diversidad ideológica, el fenómeno más disruptivo de los años 90: el movimiento piquetero.

  11. Subjetividad y socialidad en los fotologs. Juventud y nuevas formas de experiencias: la escritura hecha imagen

    Directory of Open Access Journals (Sweden)

    María Belén Espoz

    2011-01-01

    Full Text Available El presente trabajo ensaya algunas interpretaciones para comprender prácticas y experiencias de jóvenes en relación al uso y consumo de TIC, desde un cruce de lecturas que incluyen la semiótica de C. Sanders Peirce y la microsociología de Erving Goffman. ¿Qué tipos de experiencias se están produciendo en el marco de estas nuevas técnicas y como afectan (si lo hacen las formas de socialidad y su constitución subjetiva de los jóvenes en la actualidad? La importancia que los soportes/mediaciones tecnológicas adquieren en la vida cotidiana de los jóvenes abre el campo a nuevas indagaciones.

  12. La industria del network marketingy la producción de nuevas subjetividades

    Directory of Open Access Journals (Sweden)

    Martha Helena Barreto

    2015-01-01

    Full Text Available El presente artículo describe los resultados parciales de la investigación “Formas de trabajo y procesos de subjetivación” que tiene como objetivo explorar la transición del trabajo material al inmaterial. Plantea como pregunta eje ¿qué tipo de acciones y formas de subjetividad produce el discurso del network marketing para instaurar este tránsito? Dicho análisis lo efectúa a través de la pregunta por las nuevas formas de explotación. Concluye sobre la emergencia de nuevas subjetividades con mayor autonomía, libertad y movilidad, pero al mismo tiempo, capturadas por los intereses del consumo y el mercadeo.

  13. Nuevas directivas de calidad del aire: directivas marco y directivas hijas

    Directory of Open Access Journals (Sweden)

    Rosalía Fernández Patier

    2002-12-01

    Full Text Available Las antiguas Directivas de calidad presentaban algunos problemas en su aplicación, tanto en la gestión de la calidad del aire ambiente, como en la falta de información a la población. Las nuevas Directivas, que parten de la Directiva 96/62/CE sobre evaluación y gestión de la calidad del aire ambiente solucionan estos problemas, siendo más estrictos en los valores límites permitidos de los parámetros ya existentes y estableciendo Directivas para nuevos contaminantes, en el aire ambiente. La transposición de las nuevas Directivas a la legislación nacional, se ha realizado mediante el RD 1073/2002 de 18 de octubre y transpone las Directivas 96/62/CE; 1999/30/CE y 2000/69/CE.

  14. TRES NUEVAS ESPECIES DE Cryptocanthon BALTHASAR, 1942 (COLEOPTERA: SCARABAEIDAE: SCARABAEINAE PARA COLOMBIA

    Directory of Open Access Journals (Sweden)

    JORGE ARMANDO ARIAS

    2014-06-01

    Full Text Available Se presenta la descripción de tres especies nuevas de Cryptocanthon para Colombia: Cryptocanthon andradei, Cryptocanthon buriticaorum y Cryptocanthon pulidoae. Se incluye ilustraciones del habitus, caracteres morfológicos externos, la genitalia del macho incluyendo los escleritos del saco interno, así como mapas de distribución. Se presenta una clave para la determinación de las especies del género presentes en Colombia. Además, se presenta nuevas localidades de recolección para las especies conocidas para Colombia y se amplía la distribución departamental de: C. altus (Santander, C. foveatus (Santander, C. peckorum (Vichada y C. humidus(Caquetá, Nariño y Putumayo.

  15. Selección de personal basado en las nuevas competencias

    OpenAIRE

    Galante Barreiro, Vanessa

    2015-01-01

    Traballo de Fin de Grao en Administración e Dirección de Empresas. Curso 2014-2015 El objetivo de este trabajo es desarrollar la selección de personal basada en las nuevas competencias. El presente trabajo está compuesto por una parte de carácter más teórico y otra más práctico. En primer lugar, la parte teórica trata temas como la importancia de los recursos humanos para una empresa, la selección de personal y, sobre todo, la selección de personal basada en las nuevas competencias. En ...

  16. Nuevas perspectivas en el manejo terapéutico de la enfermedad de chagas

    Directory of Open Access Journals (Sweden)

    Alfonso J Rodríguez-Morales

    2005-04-01

    Full Text Available Desde hace un par de décadas y más aun en los últimos cinco años, se ha desarrollado un gran número de estudios que demuestran la actividad tripanocida de diversas drogas, algunas nuevas, muchas viejas, lo cual aunado al conocimiento acerca de la persistencia parasitaria de Trypanosoma cruzi en tejido miocárdico, entre otros, durante las fases crónicas de la enfermedad, permiten hacer patente que existe un nuevo paradigma, nuevas aproximacio-nes al manejo terapéutico del paciente con enfermedad de Chagas. En el presente artículo se revisan las principales bases que sustentan dichas perspectivas terapéuticas en la tripanosomiasis americana.

  17. La nueva creación en el pensamiento de Pablo

    OpenAIRE

    Espíndola García, Luis

    2016-01-01

    En la tradición teológica de la religión judía que demostró poseer Pablo de Tarso, el Dios de Israel tiene el poder de crear y el poder de volver a crear; es decir, realizar una nueva creación. Pablo experimentó cómo en Jesús, Dios ha revelado la salvación, el perdón de los pecados por amor a toda la humanidad; y cada vez que un ser humano recibe este don por parte de Dios, se genera un nuevo ser. La comprensión e interpretación del mensaje teológico de Pablo sobre el tema de la nueva creació...

  18. Adicción a las nuevas tecnologías

    OpenAIRE

    Baños Zamora, Rosario

    2012-01-01

    Se aborda el tema de las adicciones a las nuevas tecnologías, especialmente internet y videojuegos. Internet es la herramienta que da acceso a una gran cantidad de posibilidades, pero también es una ventana abierta a problemas de diversa índole en personas con determinadas características. Los videojuegos, por otro lado, generan una problemática más férrea pero con un menor sector poblacional afectado.

  19. Pedro Duque Cornejo y la escultura barroca en Sevilla: nuevas aportaciones

    Directory of Open Access Journals (Sweden)

    Manuel García Luque

    2013-01-01

    Full Text Available Pedro Duque Cornejo (1678-1757 es una figura de capital importancia para comprender el desarrollo del barroco meridional durante la primera mitad del siglo XVIII. En este artículo damos a conocer una docena de nuevas atribuciones repartidas por Sevilla y provincia, que vienen a incrementar su ya de por sí nutrido catálogo y que avalan su carácter polifacético como escultor, pintor y arquitecto de retablos.

  20. Buddleja filibracteolata (Buddlejaceae), una nueva especie para Costa Rica

    OpenAIRE

    Morales, J. Francisco; González, José

    2007-01-01

    Buddleja filibracteolata (Buddlejaceae), a new species from Costa Rica is described and illustrated and its relationships with B. crotonoides A. Gray are discussed. Buddleja filibracteolata is distinguished by its sessile leaves, amplexicaul leaf blades, and spiciform inflorescence with numerous and conspicuous threadlike bracteoles.Se describe e ilustra Buddleja filibracteolata (Buddlejaceae), una nueva especie de Costa Rica, y se compara con la especie más cercana, B. crotonoides A. Gray. B...

  1. Siete especies nuevas de Allorhogas (Hymenoptera: Braconidae: Doryctinae) de México

    OpenAIRE

    Martínez, Juan José; Zaldívar-Riverón, Alejandro

    2013-01-01

    Se describen, ilustran y caracterizan molecularmente 7 especies nuevas del género gallícola Allorhogas (Braconidae: Doryctinae): A. amuzgo sp. nov., A. coccolobae sp. nov., A. crassifemur sp. nov., A. jaliscoensis sp. nov., A. marshi sp. nov., A. parvus sp. nov. y A. scotti sp. nov. Estas especies fueron recolectadas en bosques tropicales caducifolios de la costa del Pacífico mexicano en Jalisco, Oaxaca y Guerrero. Allorhogas coccolobae fue criada de agallas foliares en Coccoloba barbadensis ...

  2. Web 2.0 para la Biblioteca Digital de Nueva Generación (BDNG)

    OpenAIRE

    Barraza Difilippo, José Rafael

    2010-01-01

    El desarrollo del presente trabajo tiene como objetivo principal diseñar e implementar herramientas de la WEB 2.0 en el sistema BDNG (Biblioteca Digital de Nueva Generación) para mejorar la interacción del usuario con dicha plataforma, y así creando comunidades virtuales científicas interuniversitarias y redes de conocimiento que beneficiarán la producción científica del país.

  3. On the internal representation of numerical magnitude and physical size.

    Science.gov (United States)

    Fitousi, Daniel

    2014-01-01

    A nascent idea in the numerical cognition literature--the analogical hypothesis (Pinel, Piazza, Bihan, & Dehaene, 2004)--assumes a common noisy code for the representation of symbolic (e.g., numerals) and nonsymbolic (e.g., numerosity, physical size, luminance) magnitudes. The present work subjected this assumption to various tests from the perspective of General Recognition Theory (GRT; Ashby &Townsend, 1986)--a multidimensional extension of Signal Detection Theory (Green & Swets, 1966). The GRT was applied to the dimensions of numerical magnitude and physical size with the following goals: (a) characterizing the internal representation of these dimensions in the psychological space, and (b) assessing various types of (in)dependence and separability governing the perception of these dimensions. The results revealed various violations of independence and separability with Stroop incongruent, but not with Stroop congruent stimuli. The outcome suggests that there are deep differences in architecture between Stroop congruent and incongruent stimuli that reach well beyond the semantic relationship involved.

  4. On the frequency-magnitude law for fractal seismicity

    International Nuclear Information System (INIS)

    Molchan, G.; Kronrod, T.

    2004-09-01

    Scaling analysis of seismicity in the space-time-magnitude domain very often starts from the relation λ(m, L = a L 10 -bm L c for the rate of seismic events of magnitude M > m in an area of size L. There are some evidences in favor of multifractal property of seismic process. In this case the choice of the scale exponent 'c' is not unique. It is shown how different 'c's are related to different types of spatial averaging applied to λ (m, L) and what are the 'c's for which the distributions of a L best agree for small L. Theoretical analysis is supplemented with an analysis of California data for which the above issues were recently discussed on an empirical level. (author)

  5. EARTHQUAKE-INDUCED DEFORMATION STRUCTURES AND RELATED TO EARTHQUAKE MAGNITUDES

    Directory of Open Access Journals (Sweden)

    Savaş TOPAL

    2003-02-01

    Full Text Available Earthquake-induced deformation structures which are called seismites may helpful to clasify the paleoseismic history of a location and to estimate the magnitudes of the potention earthquakes in the future. In this paper, seismites were investigated according to the types formed in deep and shallow lake sediments. Seismites are observed forms of sand dikes, introduced and fractured gravels and pillow structures in shallow lakes and pseudonodules, mushroom-like silts protruding laminites, mixed layers, disturbed varved lamination and loop bedding in deep lake sediments. Earthquake-induced deformation structures, by benefiting from previous studies, were ordered according to their formations and earthquake magnitudes. In this order, the lowest eartquake's record is loop bedding and the highest one is introduced and fractured gravels in lacustrine deposits.

  6. THE ABSOLUTE MAGNITUDES OF TYPE Ia SUPERNOVAE IN THE ULTRAVIOLET

    International Nuclear Information System (INIS)

    Brown, Peter J.; Roming, Peter W. A.; Ciardullo, Robin; Gronwall, Caryl; Hoversten, Erik A.; Pritchard, Tyler; Milne, Peter; Bufano, Filomena; Mazzali, Paolo; Elias-Rosa, Nancy; Filippenko, Alexei V.; Li Weidong; Foley, Ryan J.; Hicken, Malcolm; Kirshner, Robert P.; Gehrels, Neil; Holland, Stephen T.; Immler, Stefan; Phillips, Mark M.; Still, Martin

    2010-01-01

    We examine the absolute magnitudes and light-curve shapes of 14 nearby (redshift z = 0.004-0.027) Type Ia supernovae (SNe Ia) observed in the ultraviolet (UV) with the Swift Ultraviolet/Optical Telescope. Colors and absolute magnitudes are calculated using both a standard Milky Way extinction law and one for the Large Magellanic Cloud that has been modified by circumstellar scattering. We find very different behavior in the near-UV filters (uvw1 rc covering ∼2600-3300 A after removing optical light, and u ∼ 3000-4000 A) compared to a mid-UV filter (uvm2 ∼2000-2400 A). The uvw1 rc - b colors show a scatter of ∼0.3 mag while uvm2-b scatters by nearly 0.9 mag. Similarly, while the scatter in colors between neighboring filters is small in the optical and somewhat larger in the near-UV, the large scatter in the uvm2 - uvw1 colors implies significantly larger spectral variability below 2600 A. We find that in the near-UV the absolute magnitudes at peak brightness of normal SNe Ia in our sample are correlated with the optical decay rate with a scatter of 0.4 mag, comparable to that found for the optical in our sample. However, in the mid-UV the scatter is larger, ∼1 mag, possibly indicating differences in metallicity. We find no strong correlation between either the UV light-curve shapes or the UV colors and the UV absolute magnitudes. With larger samples, the UV luminosity might be useful as an additional constraint to help determine distance, extinction, and metallicity in order to improve the utility of SNe Ia as standardized candles.

  7. METHOD FOR SOLVING FUZZY ASSIGNMENT PROBLEM USING MAGNITUDE RANKING TECHNIQUE

    OpenAIRE

    D. Selvi; R. Queen Mary; G. Velammal

    2017-01-01

    Assignment problems have various applications in the real world because of their wide applicability in industry, commerce, management science, etc. Traditional classical assignment problems cannot be successfully used for real life problem, hence the use of fuzzy assignment problems is more appropriate. In this paper, the fuzzy assignment problem is formulated to crisp assignment problem using Magnitude Ranking technique and Hungarian method has been applied to find an optimal solution. The N...

  8. Radiation, chemicals and combined effects

    International Nuclear Information System (INIS)

    Sinclair, W.K.

    1991-01-01

    A brief background has been provided on current carcinogenic risks from ionizing radiation and their magnitude in background circumstances. The magnitude of the risks from possibly carcinogenic chemicals at background levels in air, water and food are surprisingly similar. The exception is, perhaps, for the single source of radon which, while variable, on the average stands out above all other sources. Some basic principles concerning the interaction of combined radiation and chemicals and some practical examples where the two interact synergistically to enhance radiation effects has also been provided. Areas for human research in the future are discussed. (Author)

  9. POTENCIALIDAD DEL PLÁTANO VERDE EN LA NUEVA MATRIZ PRODUCTIVA DEL ECUADOR

    Directory of Open Access Journals (Sweden)

    Rubén Paz

    2013-12-01

    Full Text Available El presente trabajo revela la potencialidad que tiene el  plátano verde o macho para incorporarlo en la nueva matriz productiva la misma que hace referencia al cambio del modelo primario exportador, a uno fundamentado en el valor agregado de los productos.  Para ello, se argumenta en las bondades de la naturaleza para la producción de éste producto, como también en la versatilidad que tiene para ser transformado en la industria de alimentos y en otras por el importante contenido de fibra y celulosa, materias primas requerida en muchos procesos industriales, lo que generará nuevas plazas directas de trabajo. Así también se reconocen las dificultades que tienen las áreas cultivadas en cuanto a problemas fitosanitarios y desastres naturales. La nueva matriz productiva tendrá como objetivo primordial garantizar el Sumak kawsay, que significa estado de bienestar  de la población,  y en especial de los agricultores pobres, a quienes a través de la capacitación y apoyo financiero se les haga partícipes de éste gran reto.

  10. Corporalidad, espacio y nuevas formas de socialidad en la cinematografía de Luis Ortega

    Directory of Open Access Journals (Sweden)

    Esteban Marcos Dipaola

    2010-08-01

    Full Text Available El artículo analiza la dimensión visual de la corporalidad tal como aparece en las estéticas, las narrativas y las imágenes de los films de Luis Ortega, Caja negra y Monobloc. Partiendo de esa exposición de la corporalidad y también de los gestos y los afectos, se busca analizar la conformación de un espacio social íntimo y cotidiano que en la cinematografía de Ortega se hace presente con la figura de los micromundos, para comprender las nuevas formas de socialidad y la nueva expresión de la experiencia social, ahora dada en la materialidad de los cuerpos como formas de vinculación. Así, las relaciones entre cuerpo y vida o entre cuerpo y dolor se conjugan en el artículo como formas de pensar las condiciones de una nueva experiencia social y cultural. Fecha de recepción: 19 de febrero de 2010. Fecha de aceptación: 14 de julio de 2010.

  11. LA UNIVERSIDAD POSTMODERNA Y LA NUEVA CREACIÓN DEL CONOCIMIENTO

    Directory of Open Access Journals (Sweden)

    María José García Ruiz

    2012-01-01

    Full Text Available La globalización y su potenciación de la dimensión económica de las sociedades occidentales han favorecido la ascendencia y el influjo de la visión postmoderna de la universidad y del paradigma de la nueva creación del conocimiento por dicha visión propuesto. Los dos modos de creación del conocimiento, Modo 1 y Modo 2, constituyen dos paradigmas opuestos que concretan epistemológicamente los dos modelos, moderno y postmoderno, de universidad que coexisten sin relacionarse en los primeros años del siglo XXI. La masificación de la universidad constituye el argumento más potente de los defensores de la nueva epistemología. Si bien no se puede negar la existencia y el crecimiento de los nuevos desarrollos epistemológicos, quedan aspectos no resueltos del mismo necesitados aún de mucho debate académico. Entre estos destacan dos: la nueva composición de las identidades profesionales, y el presumible déficit democrático del Modo 2 de producción del conocimiento.

  12. La vivienda nueva en la ciudad de Chihuahua: oferta y demanda

    Directory of Open Access Journals (Sweden)

    María de Lourdes Romo-Aguilar

    2012-01-01

    Full Text Available El objetivo del presente artículo es analizar el papel del gobierno y del mercado inmobiliario en relación con la disponibilidad de vivienda nueva en la ciudad de Chihuahua en el periodo 2000-2005, no sólo en términos cuantitativos sino también en calidad en cuanto a que tenga las características que le permitan satisfacer las necesidades básicas de las familias, como lo define la agenda internacional denominada Habitat, éstas son: espacio suficiente, seguridad y disponibilidad de servicios, entre otros. Para ello, este trabajo se divide en seis apartados: 1 apuntes teórico-conceptuales sobre la vivienda; 2 desarrollo institucional de atención a la vivienda en México; 3 dinámica de crecimiento de la ciudad de Chihuahua; 4 características de la vivienda tradicional y nueva; 5 oferta de vivienda nueva para el caso particular, y 6 demanda de vivienda. Finalmente se presentan las conclusiones sobre el tema.

  13. Improving Children’s Knowledge of Fraction Magnitudes

    Science.gov (United States)

    Fazio, Lisa K.; Kennedy, Casey A.; Siegler, Robert S.

    2016-01-01

    We examined whether playing a computerized fraction game, based on the integrated theory of numerical development and on the Common Core State Standards’ suggestions for teaching fractions, would improve children’s fraction magnitude understanding. Fourth and fifth-graders were given brief instruction about unit fractions and played Catch the Monster with Fractions, a game in which they estimated fraction locations on a number line and received feedback on the accuracy of their estimates. The intervention lasted less than 15 minutes. In our initial study, children showed large gains from pretest to posttest in their fraction number line estimates, magnitude comparisons, and recall accuracy. In a more rigorous second study, the experimental group showed similarly large improvements, whereas a control group showed no improvement from practicing fraction number line estimates without feedback. The results provide evidence for the effectiveness of interventions emphasizing fraction magnitudes and indicate how psychological theories and research can be used to evaluate specific recommendations of the Common Core State Standards. PMID:27768756

  14. Correlating precursory declines in groundwater radon with earthquake magnitude.

    Science.gov (United States)

    Kuo, T

    2014-01-01

    Both studies at the Antung hot spring in eastern Taiwan and at the Paihe spring in southern Taiwan confirm that groundwater radon can be a consistent tracer for strain changes in the crust preceding an earthquake when observed in a low-porosity fractured aquifer surrounded by a ductile formation. Recurrent anomalous declines in groundwater radon were observed at the Antung D1 monitoring well in eastern Taiwan prior to the five earthquakes of magnitude (Mw ): 6.8, 6.1, 5.9, 5.4, and 5.0 that occurred on December 10, 2003; April 1, 2006; April 15, 2006; February 17, 2008; and July 12, 2011, respectively. For earthquakes occurring on the longitudinal valley fault in eastern Taiwan, the observed radon minima decrease as the earthquake magnitude increases. The above correlation has been proven to be useful for early warning local large earthquakes. In southern Taiwan, radon anomalous declines prior to the 2010 Mw 6.3 Jiasian, 2012 Mw 5.9 Wutai, and 2012 ML 5.4 Kaohsiung earthquakes were also recorded at the Paihe spring. For earthquakes occurring on different faults in southern Taiwan, the correlation between the observed radon minima and the earthquake magnitude is not yet possible. © 2013, National Ground Water Association.

  15. Number magnitude to finger mapping is disembodied and topological.

    Science.gov (United States)

    Plaisier, Myrthe A; Smeets, Jeroen B J

    2011-03-01

    It has been shown that humans associate fingers with numbers because finger counting strategies interact with numerical judgements. At the same time, there is evidence that there is a relation between number magnitude and space as small to large numbers seem to be represented from left to right. In the present study, we investigated whether number magnitude to finger mapping is embodied (related to the order of fingers on the hand) or disembodied (spatial). We let healthy human volunteers name random numbers between 1 and 30, while simultaneously tapping a random finger. Either the hands were placed directly next to each other, 30 cm apart, or the hands were crossed such that the left hand was on the right side of the body mid-line. The results show that naming a smaller number than the previous one was associated with tapping a finger to the left of the previously tapped finger. This shows that there is a spatial (disembodied) mapping between number magnitude and fingers. Furthermore, we show that this mapping is topological rather than metrically scaled.

  16. Radiation chemistry

    International Nuclear Information System (INIS)

    Rodgers, F.; Rodgers, M.A.

    1987-01-01

    The contents of this book include: Interaction of ionizing radiation with matter; Primary products in radiation chemistry; Theoretical aspects of radiation chemistry; Theories of the solvated electron; The radiation chemistry of gases; Radiation chemistry of colloidal aggregates; Radiation chemistry of the alkali halides; Radiation chemistry of polymers; Radiation chemistry of biopolymers; Radiation processing and sterilization; and Compound index

  17. Automated Determination of Magnitude and Source Length of Large Earthquakes

    Science.gov (United States)

    Wang, D.; Kawakatsu, H.; Zhuang, J.; Mori, J. J.; Maeda, T.; Tsuruoka, H.; Zhao, X.

    2017-12-01

    Rapid determination of earthquake magnitude is of importance for estimating shaking damages, and tsunami hazards. However, due to the complexity of source process, accurately estimating magnitude for great earthquakes in minutes after origin time is still a challenge. Mw is an accurate estimate for large earthquakes. However, calculating Mw requires the whole wave trains including P, S, and surface phases, which takes tens of minutes to reach stations at tele-seismic distances. To speed up the calculation, methods using W phase and body wave are developed for fast estimating earthquake sizes. Besides these methods that involve Green's Functions and inversions, there are other approaches that use empirically simulated relations to estimate earthquake magnitudes, usually for large earthquakes. The nature of simple implementation and straightforward calculation made these approaches widely applied at many institutions such as the Pacific Tsunami Warning Center, the Japan Meteorological Agency, and the USGS. Here we developed an approach that was originated from Hara [2007], estimating magnitude by considering P-wave displacement and source duration. We introduced a back-projection technique [Wang et al., 2016] instead to estimate source duration using array data from a high-sensitive seismograph network (Hi-net). The introduction of back-projection improves the method in two ways. Firstly, the source duration could be accurately determined by seismic array. Secondly, the results can be more rapidly calculated, and data derived from farther stations are not required. We purpose to develop an automated system for determining fast and reliable source information of large shallow seismic events based on real time data of a dense regional array and global data, for earthquakes that occur at distance of roughly 30°- 85° from the array center. This system can offer fast and robust estimates of magnitudes and rupture extensions of large earthquakes in 6 to 13 min (plus

  18. The biological effects of radiation

    International Nuclear Information System (INIS)

    Sykes, D.A.

    1979-01-01

    The hazards of radiations to man are briefly covered in this paper. The natural background sources of radiations are stated and their resulting doses are compared to those received voluntarily by man. The basis of how radiations cause biological damage is given and the resulting somatic effects are shown for varying magnitude of dose. Risk estimates are given for cancer induction and genetic effects are briefly discussed. Finally four case studies of radiation damage to humans are examined exemplifying the symptoms of large doses of radiations [af

  19. Infrared Radiative Properties of Food Materials

    Science.gov (United States)

    Precisely, infrared radiation is electromagnetic radiation whose wavelength is longer than that of visible light, but shorter than that of terahertz radiation and microwaves. The infrared portion of the electromagnetic spectrum spans roughly three orders of magnitude (750 nm to 100 µm) and has been...

  20. Roentgen's heritage and radiation phobia, a challenge to radiation research and radiation protection

    International Nuclear Information System (INIS)

    Feinendegen, L.E.

    1996-01-01

    Present practice of applying linearity to assessing risk even from very low dose exposure of complex tissues to ionising radiation has been evaluated in terms of microdosimetric approach to energy deposition in tissues, nature of radiation and also the magnitudes of conditioning and challenging doses. This paper discusses the probability of radiation risk at quite low doses on the tissues in terms of simple mathematical terms. (author). 13 refs., 2 figs., 1 tab

  1. Estuarine abandoned channel sedimentation rates record peak fluvial discharge magnitudes

    Science.gov (United States)

    Gray, A. B.; Pasternack, G. B.; Watson, E. B.

    2018-04-01

    Fluvial sediment deposits can provide useful records of integrated watershed expressions including flood event magnitudes. However, floodplain and estuarine sediment deposits evolve through the interaction of watershed/marine sediment supply and transport characteristics with the local depositional environment. Thus extraction of watershed scale signals depends upon accounting for local scale effects on sediment deposition rates and character. This study presents an examination of the balance of fluvial sediment dynamics and local scale hydro-geomorphic controls on alluviation of an abandoned channel in the Salinas River Lagoon, CA. A set of three sediment cores contained discrete flood deposits that corresponded to the largest flood events over the period of accretion from 1969 to 2007. Sedimentation rates scaled with peak flood discharge and event scale sediment flux, but were not influenced by longer scale hydro-meteorological activities such as annual precipitation and water yield. Furthermore, the particle size distributions of flood deposits showed no relationship to event magnitudes. Both the responsiveness of sedimentation and unresponsiveness of particle size distributions to hydro-sedimentological event magnitudes appear to be controlled by aspects of local geomorphology that influence the connectivity of the abandoned channel to the Salinas River mainstem. Well-developed upstream plug bar formation precluded the entrainment of coarser bedload into the abandoned channel, while Salinas River mouth conditions (open/closed) in conjunction with tidal and storm surge conditions may play a role in influencing the delivery of coarser suspended load fractions. Channel adjacent sediment deposition can be valuable records of hydro-meteorological and sedimentological regimes, but local depositional settings may dominate the character of short term (interdecadal) signatures.

  2. Magnitude of bacteraemia predicts one-year mortality

    DEFF Research Database (Denmark)

    Gradel, Kim Oren; Schønheyder, Henrik Carl; Søgaard, Mette

    Objectives: All hospitals in our region use the BacT/Alert® blood culture (BC) system with a 3-bottle BC set for adults. We hypothesized that the magnitude of bacteremia (i.e., number of positive bottles in the initial BC set) predicted one-year mortality. Methods In a population-based study we...... with a BC index of 1 (i.e., one positive bottle) were chosen as the reference group. We computed Kaplan-Meier curves and performed Cox regression analyses to estimate mortality rate ratios (MRRs) with 95 % confidence intervals [CIs] 30 and 365 days after the initial BC sampling date, first in crude analyses...... mortality....

  3. Color Magnitude Diagrams of Old, Massive GCs in M31

    Science.gov (United States)

    Caldwell, Nelson; Williams, B.; Dolphin, A. E.; Johnson, L. C.; Weisz, D. R.

    2013-01-01

    Multicolor stellar photometry of HST data of M31 collected as part of the PHAT project has been performed using the DOLPHOT suite of programs. We present results of color-magnitude diagrams created in F475W and F814W (BI) of more than 50 massive, old clusters. These are clusters in or projected on the disk. We compare the metallicities derived from the color of the giant branch stars with that derived from integrated light spectroscopy. As well, we compare the ages of massive, young clusters with those found from spectra.

  4. Radiation and radiation protection

    International Nuclear Information System (INIS)

    Landfermann, H.H.; Solbach, C.

    1992-11-01

    The brochure explains the major types of radiation, the radiation sources, effects, uses, and risks, as well as the regulatory system adopted by the government in order to keep the risks as low as possible. (orig./DG) [de

  5. Una nueva especie de Lepidoblepharis (Sauria, Gekkonidae de la Cordillera Central de Colombia Una nueva especie de Lepidoblepharis (Sauria, Gekkonidae de la Cordillera Central de Colombia

    Directory of Open Access Journals (Sweden)

    Ayala Stephen C.

    1986-12-01

    Full Text Available A third Lepidoblepharis is described from temperate elevations in the Colombian Andes. Unlike L. colombianus or L. duolepis, the new species from central Antioquia is a small, moderately short toed species, reaching about 30 mm snout-vent length. Most specimens have prominent rust colored dorsolateral stripes on the tail. Una tercera especie de Lepidoblepharis se describe de zonas templadas de los Andes de Colombia. A diferencia de L. colombianus o L. duolepis, la nueva especie de Antioquia es una especie de menor tamaño que alcanza unos 30 mm de longitud rostro-ano, y los dedos son moderadamente cortos. La mayoría de los ejemplares tiene franjas dorsolaterales muy notorias de color herrumbre en la cola.

  6. Nueva especie de (Sauria: Iguanidae Lagarto Collarejo de la zona sur andina de Colombia Nueva especie de (Sauria: Iguanidae Lagarto Collarejo de la zona sur andina de Colombia

    Directory of Open Access Journals (Sweden)

    Castro Fernando

    1982-04-01

    Full Text Available Two species of the Andean lizard genus Stenocercus are reported from Colombia, in addition to the well-known S. trachycepbalus. The presence of Stenocercus guentheri, group lizards in the southern Departamento de Nariño is confirmed. A new species of Stenocercus is described from the immediate surroundings of the town of Bolivar, Departamento del Cauca.Se informa la presencia en Colombia de dos especies adicionales de lagartos del género andino Stenocercus, además de la especie bien conocida S. trachycephalus. Se confirma la presencia de poblaciones del grupo S. guentheri en el Departamento de Nariño. Se describe una especie nueva de Stenocercus de los alrededores del Municipio de Bolívar en el Departamento del Cauca.

  7. Nuevas tintas digitales para la obtención de innovadores efectos cerámicos con los que generar nuevas posibilidades y tendencias de futuro

    Directory of Open Access Journals (Sweden)

    Torrecid, Grupo

    2012-04-01

    Full Text Available This technical note contains the most significant aspects of the work “New digital inks for the production of innovative ceramic effects which generate new possibilities and future trends” in which the Group Torrecid won the “Alfa de Oro 2012” given by the Spanish Society of Ceramics and Glass. To achieve the stated objectives to work in different fields of activity for each specific ink has been necessary, comprising, among other, aspects such as the development of special frits, selecting the most suitable solvents or optimizing the compositions to ensure that the inks have appropriate behaviour in the printing process and met all the requirements of stability and quality that the ceramic industry demand.

    En la presente nota técnica se recoge los aspectos más significativos del trabajo “Nuevas tintas digitales para la obtención de innovadores efectos cerámicos con los que generar nuevas posibilidades y tendencias de futuro” por el que el Grupo Torrecid obtuvo el Premio Alfa de Oro 2012 otorgado por la Sociedad Española de Cerámica y Vidrio. Para conseguir los objetivos planteados ha sido necesario trabajar en diferentes campos de actuación para cada tinta en concreto, abarcando, entre otros, aspectos como el desarrollo de fritas especiales, la selección de los disolventes más adecuados o la optimización de las composiciones para conseguir que las tintas tuvieran un comportamiento adecuado en el proceso de impresión y cumplieran todos los requisitos de estabilidad y calidad que el sector cerámico demanda.

  8. CLAUDE PARENT EN NUEVA FORMA: LA RECEPCIÓN DE ARCHITECTURE PRINCIPE EN ESPAÑA / Claude Parent at Nueva Forma: the reading of Architecture Principe in Spain

    Directory of Open Access Journals (Sweden)

    Lucía C. Pérez Moreno

    2014-11-01

    Full Text Available RESUMEN En los agitados años sesenta, en países como Francia, Inglaterra o Japón, proliferaron equipos de arquitectos, sociólogos y urbanistas que planteaban radicales visiones del hecho arquitectónico. De entre todos ellos, Architecture Principe destacó por su repercusión en España, esencialmente debido a la estrecha relación entre Claude Parent, uno de sus fundadores, y Juan Daniel Fullaondo, director de la revista Nueva Forma. Las teorías de Claude Parent y Paul Virilio en torno a La fonction oblique y Le troisieme ordre Urbain se divulgaron en la revista madrileña de forma coetánea con su país de origen. Sin embargo, la recepción de sus propuestas visionarias se vio desvirtuada con respecto a su propaganda original. Fullaondo dio un valor sobresaliente a las posibilidades reales de su arquitectura, lo que conllevo dejar en un segundo plano la condición utópica del grupo y fijar la atención en lo verosímil de sus propuestas. A ello se sumó el interés por divulgar los primeros proyectos de Claude Parent, en la línea de colaboraciones previas con otros arquitectos como André Bloc e Ionel Schein, cuyas obras fueron igualmente objeto de publicación en Nueva Forma. Esta decisión supuso que la labor de Virilio se viese relegada y que la figura de Claude Parent fuese la realmente protagonista.

  9. Large magnitude earthquakes on the Awatere Fault, Marlborough

    International Nuclear Information System (INIS)

    Mason, D.P.M.; Little, T.A.; Van Dissen, R.J.

    2006-01-01

    The Awatere Fault is a principal active strike-slip fault within the Marlborough fault system, and last ruptured in October 1848, in the M w ∼7.5 Marlborough earthquake. The coseismic slip distribution and maximum traceable length of this rupture are calculated from the magnitude and distribution of small, metre-scale geomorphic displacements attributable to this earthquake. These data suggest this event ruptured ∼110 km of the fault, with mean horizontal surface displacement of 5.3 ± 1.6m. Based on these parameters, the moment magnitude of this earthquake would be M w ∼7.4-7.7. Paeloseismic trenching investigations along the eastern section reveal evidence for at least eight, and possibly ten, surface-rupturing paleoearthquakes in the last 8600 years, including the 1848 rupture. The coseismic slip distribution and rupture length of the 1848 earthquake, in combination with the paleoearthquake age data, suggest the eastern section of the Awatere Fault ruptures in M w ∼7.5 earthquakes, with over 5 m of surface displacement, every 860-1080 years. (author). 21 refs., 10 figs., 7 tabs

  10. On the Real Magnitude of Psychological Sex Differences

    Directory of Open Access Journals (Sweden)

    Marco Del Giudice

    2009-04-01

    Full Text Available A comprehensive evolutionary theory of sex differences will benefit from an accurate assessment of their magnitude across different psychological domains. This article shows that mainstream research has severely underestimated the magnitude of psychological sex differences; the reason lies in the common practice of measuring multidimensional differences one dimension at a time, without integrating them into a proper multivariate effect size (ES. Employing the Mahalanobis distance D (the multivariate generalization of Cohen's d results in more accurate, and predictably larger, estimates of overall sex differences in multidimensional constructs. Two real-world examples are presented: (1 In a published dataset on Big Five personality traits, sex differences on individual scales averaged d = .27, a typical ES conventionally regarded as “small.” However, the overall difference was D = .84 (disattenuated D = .98, implying considerable statistical separation between male and female distributions. (2 In a recent meta-analytic summary of sex differences in aggression, the individual ESs averaged d = .34. However, the overall difference was estimated at D = .75 – .80 (disattenuated D = .89–1.01. In many psychological domains, sex differences may be substantially larger than previously acknowledged.

  11. Local magnitude scale for Valle Medio del Magdalena region, Colombia

    Science.gov (United States)

    Londoño, John Makario; Romero, Jaime A.

    2017-12-01

    A local Magnitude (ML) scale for Valle Medio del Magdalena (VMM) region was defined by using 514 high quality earthquakes located at VMM area and inversion of 2797 amplitude values of horizontal components of 17 stations seismic broad band stations, simulated in a Wood-Anderson seismograph. The derived local magnitude scale for VMM region was: ML =log(A) + 1.3744 ∗ log(r) + 0.0014776 ∗ r - 2.397 + S Where A is the zero-to-peak amplitude in nm in horizontal components, r is the hypocentral distance in km, and S is the station correction. Higher values of ML were obtained for VMM region compared with those obtained with the current formula used for ML determination, and with California formula. With this new scale ML values are adjusted to local conditions beneath VMM region leading to more realistic ML values. Moreover, with this new ML scale the seismicity caused by tectonic or fracking activity at VMM region can be monitored more accurately.

  12. Optimal updating magnitude in adaptive flat-distribution sampling.

    Science.gov (United States)

    Zhang, Cheng; Drake, Justin A; Ma, Jianpeng; Pettitt, B Montgomery

    2017-11-07

    We present a study on the optimization of the updating magnitude for a class of free energy methods based on flat-distribution sampling, including the Wang-Landau (WL) algorithm and metadynamics. These methods rely on adaptive construction of a bias potential that offsets the potential of mean force by histogram-based updates. The convergence of the bias potential can be improved by decreasing the updating magnitude with an optimal schedule. We show that while the asymptotically optimal schedule for the single-bin updating scheme (commonly used in the WL algorithm) is given by the known inverse-time formula, that for the Gaussian updating scheme (commonly used in metadynamics) is often more complex. We further show that the single-bin updating scheme is optimal for very long simulations, and it can be generalized to a class of bandpass updating schemes that are similarly optimal. These bandpass updating schemes target only a few long-range distribution modes and their optimal schedule is also given by the inverse-time formula. Constructed from orthogonal polynomials, the bandpass updating schemes generalize the WL and Langfeld-Lucini-Rago algorithms as an automatic parameter tuning scheme for umbrella sampling.

  13. Radiation measurement

    International Nuclear Information System (INIS)

    Go, Sung Jin; Kim, Seung Guk; No, Gyeong Seok; Park, Myeong Hwan; Ann, Bong Seon

    1998-03-01

    This book explains technical terms about radiation measurement, which are radiation, radiation quantity and unit such as prefix of international unit, unit for defence purposes of radiation, coefficient of radiation and interaction, kinds and principles of radiation detector, ionization chamber, G-M counter, G-M tube, proportional counter, scintillation detector, semiconductor radiation detector, thermoluminescence dosimeter, PLD, others detector, radiation monitor, neutron detector, calibration of radiation detector, statistics of counting value, activation analysis and electronics circuit of radiation detector.

  14. Interaction of Volcanic Forcing and El Nino: Sensitivity to the Eruption Magnitude and El Nino Intensity

    KAUST Repository

    Predybaylo, Evgeniya

    2015-04-01

    Volcanic aerosols formed in the stratosphere after strong explosive eruptions influence Earth\\'s radiative balance, affecting atmospheric and oceanic temperatures and circulation. It was observed that the recent volcanic eruptions frequently occurred in El Nino years. Analysis of the paleo data confirms that the probability of a sequent El Nino occurrence after the eruption increases. To better understand the physical mechanism of this interaction we employed ocean-atmosphere coupled climate model CM2.1, developed in the Geophysical Fluid Dynamics Laboratory, and conducted a series of numerical experiments using initial conditions with different El Nino Southern Oscillation (ENSO) strengths forced by volcanic eruptions of different magnitudes, Pinatubo of June 1991 and Tambora of April 1815: (i) strong ENSO/Pinatubo, (ii) weak ENSO/Pinatubo, (iii) strong ENSO/Tambora. The amount of ejected material from the Tambora eruption was about three times greater than that of the Pinatubo eruption. The initial conditions with El Nino were sampled from the CM2.1 long control run. Our simulations show the enhancement of El Nino in the second year after an eruption. We found that the spatial-temporal structure of model responses is sensitive to both the magnitude of an eruption and the strength of El Nino. We analyzed the ocean dynamic in the tropical Pacific for all cases to uncover the physical mechanism, resulting in the enhanced and/or prolonged El Nino.

  15. Interaction of Volcanic Forcing and El Nino: Sensitivity to the Eruption Magnitude and El Nino Intensity

    KAUST Repository

    Predybaylo, Evgeniya; Wittenberg, Andrew; Stenchikov, Georgiy L.

    2015-01-01

    Volcanic aerosols formed in the stratosphere after strong explosive eruptions influence Earth's radiative balance, affecting atmospheric and oceanic temperatures and circulation. It was observed that the recent volcanic eruptions frequently occurred in El Nino years. Analysis of the paleo data confirms that the probability of a sequent El Nino occurrence after the eruption increases. To better understand the physical mechanism of this interaction we employed ocean-atmosphere coupled climate model CM2.1, developed in the Geophysical Fluid Dynamics Laboratory, and conducted a series of numerical experiments using initial conditions with different El Nino Southern Oscillation (ENSO) strengths forced by volcanic eruptions of different magnitudes, Pinatubo of June 1991 and Tambora of April 1815: (i) strong ENSO/Pinatubo, (ii) weak ENSO/Pinatubo, (iii) strong ENSO/Tambora. The amount of ejected material from the Tambora eruption was about three times greater than that of the Pinatubo eruption. The initial conditions with El Nino were sampled from the CM2.1 long control run. Our simulations show the enhancement of El Nino in the second year after an eruption. We found that the spatial-temporal structure of model responses is sensitive to both the magnitude of an eruption and the strength of El Nino. We analyzed the ocean dynamic in the tropical Pacific for all cases to uncover the physical mechanism, resulting in the enhanced and/or prolonged El Nino.

  16. Low-level radiation

    International Nuclear Information System (INIS)

    Myers, D.K.

    1982-05-01

    It is known that the normal incidence of cancer in human populations is increased by exposure to moderately high doses of ionizing radiation. At background radiation levels or at radiation levels which are 100 times greater, the potential health risks are considered to be directly proportional to the total accumulated dose of radiation. Some of the uncertainties associated with this assumption and with the accepted risk estimates have been critically reviewed in this document. The general scientific consensus at present suggests that the accepted risk estimates may exaggerate the actual risk of low levels of sparsely ionizing radiations (beta-, gamma- or X-rays) somewhat but are unlikely to overestimate the actual risks of densely ionizing radiations (fast neutrons, alpha-particles). At the maximum permissible levels of exposure for radiation workers in nuclear power stations, the potential health hazards in terms of life expectancy would be comparable to those encountered in transportation and public utilities or in the construction industry. At the average radiation exposures received by these workers in practice, the potential health hazards are similar to those associated with safe categories of industries. Uranium mining remains a relativly hazardous occupation. In terms of absolute numbers, the genetic hazards, which are less well established, are thought to be smaller than the carcinogenic hazards of radiation when only the first generation is considered but to be of the same order of magnitude as the carcinogenic hazards when the total number of induced genetic disorders is summed over all generations

  17. The absolute magnitude distribution of Kuiper Belt objects

    Energy Technology Data Exchange (ETDEWEB)

    Fraser, Wesley C. [Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7 (Canada); Brown, Michael E. [Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Morbidelli, Alessandro [Laboratoire Lagrange, UMR7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d' Azur, BP 4229, F-06304 Nice (France); Parker, Alex [Department of Astronomy, University of California at Berkeley, Berkeley, CA 94720 (United States); Batygin, Konstantin, E-mail: wesley.fraser@nrc.ca [Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 51, Cambridge, MA 02138 (United States)

    2014-02-20

    Here we measure the absolute magnitude distributions (H-distribution) of the dynamically excited and quiescent (hot and cold) Kuiper Belt objects (KBOs), and test if they share the same H-distribution as the Jupiter Trojans. From a compilation of all useable ecliptic surveys, we find that the KBO H-distributions are well described by broken power laws. The cold population has a bright-end slope, α{sub 1}=1.5{sub −0.2}{sup +0.4}, and break magnitude, H{sub B}=6.9{sub −0.2}{sup +0.1} (r'-band). The hot population has a shallower bright-end slope of, α{sub 1}=0.87{sub −0.2}{sup +0.07}, and break magnitude H{sub B}=7.7{sub −0.5}{sup +1.0}. Both populations share similar faint-end slopes of α{sub 2} ∼ 0.2. We estimate the masses of the hot and cold populations are ∼0.01 and ∼3 × 10{sup –4} M {sub ⊕}. The broken power-law fit to the Trojan H-distribution has α{sub 1} = 1.0 ± 0.2, α{sub 2} = 0.36 ± 0.01, and H {sub B} = 8.3. The Kolmogorov-Smirnov test reveals that the probability that the Trojans and cold KBOs share the same parent H-distribution is less than 1 in 1000. When the bimodal albedo distribution of the hot objects is accounted for, there is no evidence that the H-distributions of the Trojans and hot KBOs differ. Our findings are in agreement with the predictions of the Nice model in terms of both mass and H-distribution of the hot and Trojan populations. Wide-field survey data suggest that the brightest few hot objects, with H{sub r{sup ′}}≲3, do not fall on the steep power-law slope of fainter hot objects. Under the standard hierarchical model of planetesimal formation, it is difficult to account for the similar break diameters of the hot and cold populations given the low mass of the cold belt.

  18. The absolute magnitude distribution of Kuiper Belt objects

    International Nuclear Information System (INIS)

    Fraser, Wesley C.; Brown, Michael E.; Morbidelli, Alessandro; Parker, Alex; Batygin, Konstantin

    2014-01-01

    Here we measure the absolute magnitude distributions (H-distribution) of the dynamically excited and quiescent (hot and cold) Kuiper Belt objects (KBOs), and test if they share the same H-distribution as the Jupiter Trojans. From a compilation of all useable ecliptic surveys, we find that the KBO H-distributions are well described by broken power laws. The cold population has a bright-end slope, α 1 =1.5 −0.2 +0.4 , and break magnitude, H B =6.9 −0.2 +0.1 (r'-band). The hot population has a shallower bright-end slope of, α 1 =0.87 −0.2 +0.07 , and break magnitude H B =7.7 −0.5 +1.0 . Both populations share similar faint-end slopes of α 2 ∼ 0.2. We estimate the masses of the hot and cold populations are ∼0.01 and ∼3 × 10 –4 M ⊕ . The broken power-law fit to the Trojan H-distribution has α 1 = 1.0 ± 0.2, α 2 = 0.36 ± 0.01, and H B = 8.3. The Kolmogorov-Smirnov test reveals that the probability that the Trojans and cold KBOs share the same parent H-distribution is less than 1 in 1000. When the bimodal albedo distribution of the hot objects is accounted for, there is no evidence that the H-distributions of the Trojans and hot KBOs differ. Our findings are in agreement with the predictions of the Nice model in terms of both mass and H-distribution of the hot and Trojan populations. Wide-field survey data suggest that the brightest few hot objects, with H r ′ ≲3, do not fall on the steep power-law slope of fainter hot objects. Under the standard hierarchical model of planetesimal formation, it is difficult to account for the similar break diameters of the hot and cold populations given the low mass of the cold belt.

  19. La enseñanza tradicional de las ciencias versus las nuevas tendencias educativas

    Directory of Open Access Journals (Sweden)

    María Isabel Torres-Salas

    2010-06-01

    Full Text Available Recibido 27 de octubre de 2009 • Aceptado 02 de diciembre de 2009 • Corregido 05 de marzo de 2010       Para pensar en una propuesta educativa que enseñe a aprender, es necesario pensar en un cambio no sólo en lo educativo, sino, también, en lo político, económico, social, ecológico y cultural, entre otros; que permita una comprensión de la realidad y es aquí donde la construcción del conocimiento y el rol de las ciencias tienen un papel fundamental. Pero no debemos olvidar que el desarrollo de la ciencia ha estado marcado por la llamada ciencia positivista, la cual se caracteriza por interpretar los fenómenos y la forma cómo funcionan éstos por medio de teorías y leyes, en los que el contexto y el ser humano tienen un papel protagónico muy pobre, por no decir ninguno; a esto se le puede llamar el cientificismo, que ha permitido un desarrollo, incluso, sobre de las necesidades humanas. Pero, desde los 90s, se da un resurgimiento paulatino del humanismo en los campos educativos y se busca trabajar en la revalorización de lo humano, lo cual implica una serie de cambios en el plano epistemológico y metodológico que nos impulsa hacia nuevas formas de trabajar. Esto nos llama a reflexionar en alternativas trascendentales para la construcción del conocimiento, que superen la enseñanza tradicional de las ciencias, que sean amplias, sistemáticas, flexibles y enmarcadas en una cultura humanista. Algunos modelos de las nuevas tendencias son: investigación dirigida, aprendizaje por descubrimiento, aprendizaje por indagación y la enseñanza de las ciencias y las nuevas tecnologías.

  20. NUEVA RURALIDAD Y SUSTENTABILIDAD SOCIAL EN EL PUEBLO MÁGICO DE CALVILLO, AGUASCALIENTES

    Directory of Open Access Journals (Sweden)

    Alejandro Palafox-Muñoz

    2016-06-01

    Full Text Available Con la finalidad de penetrar los espacios rurales para promover el modo de producción capitalista el Estado ha elaborado estrategias para la renovación del espacio rural, a ello se le denomina nueva ruralidad, la cual impulsa el turismo como actividad económica tanto en el campo como en áreas naturales protegidas. En este sentido, el Programa Pueblos Mágicos contribuye a establecer las acciones encaminadas a la apropiación, funcionalización y homogenización del territorio en espacios con precariedades marcadas por la pobreza. Calvillo, Aguascalientes, hoy en día reconocido por la Secretaría de Turismo como uno de los Pueblos Mágicos, es ejemplo vivo de la nueva ruralidad institucional, la cual se caracteriza por una intervención del Estado para el control de los recursos, así como para dirigir la actividad económica de acuerdo con los intereses del capital. Metodológicamente, se aplicaron una serie de entrevistas en profundidad, para que dicha información contribuya al análisis de los efectos de la nueva ruralidad institucional sobre la sustentabilidad social de la localidad, ya que la sociedad está perdiendo las actividades tradicionales que le caracterizaban y la participación de la comunidad se limita a la recepción de recursos e instrucciones para el desarrollo turístico de la comunidad.

  1. ANÁLISIS DE LA NUEVA LEY DE EDUCACIÓN EN ESPAÑA

    Directory of Open Access Journals (Sweden)

    ANTONI ARASANZ MAYOLAS

    2014-01-01

    Full Text Available El Gobierno del Estado español planteó en 2012 una nueva reforma educativa (la séptima en treinta años mediante la redacción y la tramitación del anteproyecto de ley orgánica que lleva el título de Ley Orgánica para la Mejora de la Calidad Educativa (Lomce. Se señala que los objetivos de esta reforma son: Reducir el abandono escolar prematuro y mejorar la tasa de población que termina la educación obligatoria, fomentar la empleabilidad, mejorar el nivel de conocimientos en materias prioritarias, incrementar la autonomía de los centros docentes, intensificar el uso de las tecnologías de la información y la comunicación y mejorar el aprendizaje de las lenguas extranjeras. Durante el período de tramitación del anteproyecto de ley, el Ministerio dio a conocer hasta tres versiones diferentes del texto de la disposición, con fechas 25 de septiembre de 2012, 3 de diciembre de 2012 y 14 de febrero de 2013, en cada una de las cuales se introducían nuevas modificaciones sustanciales. Finalmente se presentó el Proyecto de Ley al Parlamento y al Senado de España, siendo aprobada la ley el 9 de diciembre de 2013 con el nombre definitivo de Ley Orgánica para la Mejora de la Calidad Educativa (Lomce. Este trabajo analiza el contenido de la nueva ley.

  2. Temporal and spatial variations in the magnitude of completeness for homogenized moment magnitude catalogue for northeast India

    Science.gov (United States)

    Das, Ranjit; Wason, H. R.; Sharma, M. L.

    2012-02-01

    Northeast India region is one of the most seismically active areas in the world. Events data for the period 1897-2010, used in this study has been largely compiled from global ISC, NEIC and GCMT databases. Historical seismicity catalogue of Gupta et al (1986) and some events data from the bulletins of India Meteorological Department are also used. Orthogonal regression relations for conversion of body and surface wave magnitudes to M w,HRVD based on events data for the period 1978-2006 have been derived. An Orthogonal Standard Regression (OSR) relationship has also been obtained for scaling of intensity estimates to M w,NEIC using 126 global intensity events with intensity VI or greater during the period 1975-2010. Magnitude of completeness and Gutenberg-Richter (GR) recurrence parameter values have been determined for the declustered homogenized catalogue pertaining to four different time periods namely, 1897-1963, 1964-1990, 1964-2000 and 1964-2010. The M c and ` b' values are observed to decrease and increase, respectively, with addition of newer data with time. The study region has been subdivided into nine seismogenic zones keeping in view the spatial variations in earthquake occurrence and prevalent tectonics. M c, ` b' and ` a' values have been estimated with respect to each zone, and the variations in the values of these parameters have been analysed.

  3. Aerogel Antennas Communications Study Using Error Vector Magnitude Measurements

    Science.gov (United States)

    Miranda, Felix A.; Mueller, Carl H.; Meador, Mary Ann B.

    2014-01-01

    This presentation discusses an aerogel antennas communication study using error vector magnitude (EVM) measurements. The study was performed using 2x4 element polyimide (PI) aerogel-based phased arrays designed for operation at 5 GHz as transmit (Tx) and receive (Rx) antennas separated by a line of sight (LOS) distance of 8.5 meters. The results of the EVM measurements demonstrate that polyimide aerogel antennas work appropriately to support digital communication links with typically used modulation schemes such as QPSK and 4 DQPSK. As such, PI aerogel antennas with higher gain, larger bandwidth and lower mass than typically used microwave laminates could be suitable to enable aerospace-to- ground communication links with enough channel capacity to support voice, data and video links from CubeSats, unmanned air vehicles (UAV), and commercial aircraft.

  4. Magnitude and Distribution of Flows into Northeastern Florida Bay

    Science.gov (United States)

    Patino, Eduardo; Hittle, Clinton D.

    2000-01-01

    Changes in water-management practices have been made to accommodate a large and rapidly growing urban population along the Atlantic Coast and to meet the demand for intensive agricultural activities. These changes have resulted in a highly managed hydrologic system consisting of numerous canals, levees, control structures, and pumping stations that have altered the hydrology of the Everglades and Florida Bay ecosystems. Over the past decade, Florida Bay has experienced sea-grass die-off and algal blooms, which are indicators of ecological change attributed primarily to the increase in salinity and nutrient content of bay waters. Because plans are to restore sheetflow in the Everglades wetlands to its natural state, water managers anticipate a change in the magnitude and timing of freshwater exiting the mainland through the creeks that cut through the embankment or as sheetflow into Florida Bay.

  5. Real time monitoring of moment magnitude by waveform inversion

    Science.gov (United States)

    Lee, J.; Friederich, W.; Meier, T.

    2012-01-01

    An instantaneous measure of the moment magnitude (Mw) of an ongoing earthquake is estimated from the moment rate function (MRF) determined in real-time from available seismic data using waveform inversion. Integration of the MRF gives the moment function from which an instantaneous Mw is derived. By repeating the inversion procedure at regular intervals while seismic data are coming in we can monitor the evolution of seismic moment and Mw with time. The final size and duration of a strong earthquake can be obtained within 12 to 15 minutes after the origin time. We show examples of Mw monitoring for three large earthquakes at regional distances. The estimated Mw is only weakly sensitive to changes in the assumed source parameters. Depending on the availability of seismic stations close to the epicenter, a rapid estimation of the Mw as a prerequisite for the assessment of earthquake damage potential appears to be feasible.

  6. Aerogel Antennas Communications Study Using Error Vector Magnitude Measurements

    Science.gov (United States)

    Miranda, Felix A.; Mueller, Carl H.; Meador, Mary Ann B.

    2014-01-01

    This paper discusses an aerogel antennas communication study using error vector magnitude (EVM) measurements. The study was performed using 4x2 element polyimide (PI) aerogel-based phased arrays designed for operation at 5 GHz as transmit (Tx) and receive (Rx) antennas separated by a line of sight (LOS) distance of 8.5 meters. The results of the EVM measurements demonstrate that polyimide aerogel antennas work appropriately to support digital communication links with typically used modulation schemes such as QPSK and pi/4 DQPSK. As such, PI aerogel antennas with higher gain, larger bandwidth and lower mass than typically used microwave laminates could be suitable to enable aerospace-to-ground communication links with enough channel capacity to support voice, data and video links from cubesats, unmanned air vehicles (UAV), and commercial aircraft.

  7. Breach Risk Magnitude: A Quantitative Measure of Database Security.

    Science.gov (United States)

    Yasnoff, William A

    2016-01-01

    A quantitative methodology is described that provides objective evaluation of the potential for health record system breaches. It assumes that breach risk increases with the number of potential records that could be exposed, while it decreases when more authentication steps are required for access. The breach risk magnitude (BRM) is the maximum value for any system user of the common logarithm of the number of accessible database records divided by the number of authentication steps needed to achieve such access. For a one million record relational database, the BRM varies from 5.52 to 6 depending on authentication protocols. For an alternative data architecture designed specifically to increase security by separately storing and encrypting each patient record, the BRM ranges from 1.3 to 2.6. While the BRM only provides a limited quantitative assessment of breach risk, it may be useful to objectively evaluate the security implications of alternative database organization approaches.

  8. Magnitude of the current in 2D interlayer tunneling devices.

    Science.gov (United States)

    Feenstra, Randall M; de la Barrera, Sergio C; Li, Jun; Nie, Yifan; Cho, Kyeongjae

    2018-01-15

    Using the Bardeen tunneling method with first-principles wave functions, computations are made of the tunneling current in graphene/hexagonal-boron-nitride/graphene (G/h-BN/G) vertical structures. Detailed comparison with prior experimental results is made, focusing on the magnitude of the achievable tunnel current. With inclusion of the effects of translational and rotational misalignment of the graphene and the h-BN, predicted currents are found to be about 15×  larger than experimental values. A reduction in this discrepancy, to a factor of 2.5×, is achieved by utilizing a realistic size for the band gap of the h-BN, hence affecting the exponential decay constant for the tunneling.

  9. Nuevas Tendencias de Procesado y Conservación de Alimentos Vegetales de IV Gama

    OpenAIRE

    Gil Muñoz, M.ª Isabel; Allende, Ana; Beltrán Riquelme, David; Selma, María Victoria

    2005-01-01

    La OTRI del Centro Tecnológico Nacional de la Conserva y Alimentación junto con la OTT del Consejo Superior de Investigaciones Científicas, colaboran en el Proyecto AGROCSIC, el cual fue aprobado por el Ministerio de Ciencia y Tecnología y financiado por el Ministerio de Educación y Ciencia. El objetivo principal de esta nueva actuación es estudiar las distintas líneas de trabajo de los Centros del CSIC relacionadas con la alimentación, para transferir sus resultados al sector industrial....

  10. La renegociación de Itaipú: una nueva oportunidad para el Paraguay

    Directory of Open Access Journals (Sweden)

    GUSTAVO ROJAS

    2009-09-01

    Full Text Available Después de casi un año de negociaciones,
    Paraguay y Brasil definieron las bases de un acuerdo
    sobre la Hidroeléctrica de Itaipú. Con este acuerdo,
    Paraguay triplicaría el ingreso que recibe por la venta
    de energía eléctrica al Brasil. Más allá de ello, los
    autores notan las nuevas posibilidades que genera
    este acuerdo, que redefine la relación bilateral con
    el Brasil.

  11. Historia de la familia: una nueva perspectiva sobre la sociedad europea

    Directory of Open Access Journals (Sweden)

    Pablo Rodríguez

    1998-01-01

    Full Text Available Historia de la Familia: una nueva perspectiva sobre la sociedad europea. 5 volúmenes, varios autores. Murcia: Universidad de Murcia, 1997. Estos cinco libros conforman la memoria de las sesiones del congreso internacional celebrado en Murcia los días 14, 15 Y 16 de diciembre de 1994, bajo el mismo título. El éxito de dicho congreso, y el atractivo de estos libros, es explicable por el continuado trabajo del seminario Familia y élite de poder en el Reino de Murcia, que desde 1983 se reúne en forma continua con el liderazgo de Francisco Chacón.

  12. Ilustración y reacción en la Nueva Granada

    Directory of Open Access Journals (Sweden)

    Javier Laviña

    1989-01-01

    Full Text Available Las Reformas Borbónicas y la influencia del pensamiento ilustrado francés, incidieron decididamente en la liberalización de la Nueva Granada. Cuando las autoridades se percataron de los aires independentistas, expresados en hechos como la "Revolución de los Pasquines", optaron por elaborar un proyecto que devolviera la seguridad al Reino. Aquí se analizan algunos de los informes oficiales sobre la situación de la Colonia y las soluciones expuestas para contrarrestar el ambiente político que se percibía.

  13. Guatemala y nueva España: historia de una plaga compartida, 1798-1807

    OpenAIRE

    Arrioja Díaz Viruell, Luis Alberto

    2015-01-01

    Este artículo examina las diversas acciones que impulsaron las autoridades de Guatemala y Nueva España para combatir una plaga de langosta que invadió sus territorios entre 1798 y 1807. De la misma manera, analiza las posturas que asumieron los funcionarios –civiles y religiosos– para interpretar y gestionar dicha catástrofe, y pondera el papel que jugaron una serie de hechos –ajenos a la naturaleza de los insectos– en el desarrollo de la plaga. This article describes the actions that led ...

  14. TIEMPO RECOMENDADO PARA UNA NUEVA CONCEPCIÓN POST ABORTO ESPONTÁNEO

    OpenAIRE

    Baltra E,Estebeni; de Mayo G,Tomás; Rojas G,María de los Ángeles; Arraztoa V,José Antonio

    2008-01-01

    Antecedentes: La recomendación del clínico acerca del tiempo a esperar para una nueva concepción post aborto espontáneo correspondería a una práctica basada en la experiencia y no en la evidencia. Objetivo: Análisis crítico de la literatura científica, en relación al tiempo de espera para intentar un nuevo embarazo en pacientes con aborto espontáneo, y los resultados materno-perinatales asociados a las diferentes conductas. Búsqueda sistemática en múltiples bases de datos. Resultados: Se enco...

  15. Inteligencia Emocional en los docentes de la Universidad Militar Nueva Granada

    OpenAIRE

    López Pacheco, Jenny Carolina; Pedraza Ortíz, Alexandra Patricia

    2016-01-01

    La presente investigación tuvo como objetivo principal describir el estado actual de la inteligencia emocional en los docentes de la Universidad Militar Nueva Granada. Se utilizaron los siguientes instrumentos: escala Trait Meta Mood Scale 24 (TMMS-24) y una encuesta de variables sociodemográficas. También se describió la percepción que tienen los docentes con relación al concepto de Inteligencia Emocional. La investigación fue de tipo observacional descriptiva, se realizó un muestreo por con...

  16. Nuevas tecnologías de la información como facilitadoras de Aprendizaje significativo

    OpenAIRE

    Irene Arriassecq; Graciela Santos

    2017-01-01

    En este trabajo se propone abordar la potencialidad de las TIC para promover aprendizaje significativo asumiendo que, en la actualidad, existe consenso en la vigencia de ese marco teórico enriquecido con los diversos aportes teóricos que ha recibido desde la década del ´60 y que, al mismo tiempo, las TIC posibilitan nuevas formas para el acceso a la educación dado que las instancias de aprendizaje se amplían ante una gran variedad de aplicaciones y recursos disponibles en Internet. Realizamos...

  17. ¿Nuevas fuentes co-innovadoras de la productividad empresarial?

    Directory of Open Access Journals (Sweden)

    Joan Torrent-Sellens

    2010-12-01

    Full Text Available La crisis económica actual ha acentuado la necesidad de transformar el patrón de crecimiento de muchas economías en todo el mundo. En el proceso de transición hacia la economía global del conocimiento, las fuentes de productividad evolucionan desde los modelos competitivos extensivos (acumulación de recursos productivos hacia los modelos competitivos intensivos (innovación. En sintonía con la evidencia internacional, en este artículo se analizan las nuevas fuentes co-innovadoras (usos de las tecnologías de la información y comunicación –TIC–, nuevas formas de organización del trabajo y cualificación de los trabajadores de la productividad empresarial para todo un tejido productivo. El conjunto del sistema empresarial en Cataluña (región del norte de España presenta unas características intrínsecas muy definidas, como la presencia mayoritaria de empresas de dimensión reducida, poco intensivas en el uso de la tecnología y el conocimiento, débilmente innovadoras, con un bajo nivel de formación y capacitación del trabajo, unos usos de las TIC mejorables y con importantes problemas de eficiencia y competitividad. Sin duda, esta es también la situación en otros territorios de la economía mundial, con lo que la metodología de análisis y los resultados obtenidos pueden ser útiles para la investigación y la promoción de las nuevas fuentes de la eficiencia y el crecimiento empresarial en otros países, regiones, sectores de actividad y grupos de empresas en todo el mundo. Los resultados obtenidos sugieren que para la gran mayoría de empresas catalanas no se ha encontrado evidencia que corrobore la existencia de nuevas fuentes de productividad y, por consiguiente, certifican su inadaptación para la competencia en los mercados globales del conocimiento.

  18. Migración interna indígena desde el Istmo veracruzano: nuevas articulaciones regionales

    OpenAIRE

    Velázquez-Hernández, Emilia

    2013-01-01

    El objetivo de este trabajo es analizar las nuevas articulaciones regionales que se crean a través de las migraciones internas. Para ello, se toma como estudio de caso las migraciones que desde mediados de la década de 1990 se realizan desde el Istmo veracruzano hacia la frontera norte de México y los campos de agricultura intensiva de Sinaloa. Se muestra que, a través de la migración laboral de trabajadores nahuas y popolucas de la Sierra de Santa Marta, regiones antes inconexas se articulan...

  19. Dos especies nuevas del género Boletus (Boletales: Agaricomycetes) en México

    OpenAIRE

    García-Jiménez, Jesús; Singer, Rolf; Estrada, Eduardo; Garza-Ocañas, Fortunato; Valenzuela, Ricardo

    2013-01-01

    Se describen e ilustran 2 especies nuevas para la ciencia del género Boletus encontradas en bosques de Quercus en los estados de Nuevo León y Tamaulipas, México: Boletus paulae y B. singeri. B. paulae pertenece a la secc. Luridi y B. singeri a la secc. Subpruinosi del género Boletus. Ambas especies son consideradas micorrizógenas, la primera con Quercus fusiformis y Q. polymorpha y la segunda con Q. canbyi. Los especímenes están depositados en los Herbarios ITCV y UNL con duplicados en F y EN...

  20. Nuevas tendencias en la Supply Management en Colombia y México

    OpenAIRE

    Caro Sánchez, Jully Alexandra; Quintero Vega, Wilmer Said

    2016-01-01

    La Misión empresarial a México 2015, tiene como propósito brindar a los estudiantes espacios para el crecimiento profesional, mediante la aplicación de los conceptos y los modelos estudiados en las diferentes visitas empresariales que se realizaron. Se pretende conocer cuáles son las nuevas tendencias en el manejo y administración de la cadena de abastecimiento de las empresas, de manera que estos conceptos puedan ser aplicados en diferentes tipos de empresas. Se realizó una investigaci...

  1. Cruzando fronteras: transnacionalismo político en la comunidad dominicana de Nueva York

    OpenAIRE

    Angélica Durán Martinez

    2010-01-01

    Este artículo analiza la participación simultánea de los migrantes Dominicanos en elecciones de los Estados Unidos y de la Republica Dominicana en 2004 y los esfuerzos de campaña de políticos dominicanos y estadounidenses como manifestaciones de transnacionalismo político. Usando evidencia de las propuestas de campaña y datos electorales del Distrito Electoral 72 en Nueva York, sostengo dos hipótesis que contribuyen a entender algunas de las formas de participación política compleja...

  2. Migración interna indígena desde el Istmo veracruzano: nuevas articulaciones regionales

    Directory of Open Access Journals (Sweden)

    Emilia Velázquez Hernández

    2013-07-01

    Full Text Available El objetivo de este trabajo es analizar las nuevas articulaciones regionales que se crean a través de las migraciones internas. Para ello, se toma como estudio de caso las migraciones que desde mediados de la década de 1990 se realizan desde el Istmo veracruzano hacia la frontera norte de México y los campos de agricultura intensiva de Sinaloa. Se muestra que, a través de la migración laboral de trabajadores nahuas y popolucas de la Sierra de Santa Marta, regiones antes inconexas se articulan actualmente de manera desigual.

  3. Integral definida, cálculo mental y nuevas tecnologías

    OpenAIRE

    Porres Tomé, Mario

    2012-01-01

    Este trabajo investiga los aprendizajes de los estudiantes de segundo curso de Bachillerato de Ciencias Sociales sobre la integral definida al integrar la docencia tradicional, el cálculo mental de primitivas elementales y las nuevas tecnologías con DERIVE. Esta investigación ha sido realizada mediante la investigación-acción y los actos de comprensión de Sierpinska. La investigación teórica consta de: estudio de los antecedentes, epistemología de la integral y una unidad didáctica del área y...

  4. Viejas y nuevas formas de hacer política: el Buen gobierno comunitario

    OpenAIRE

    Mandujano Estrada, Miguel

    2016-01-01

    En el marco de las viejas y nuevas formas de acción política, este trabajo presenta el Buen gobierno comunitario, una experiencia de intensificación democrática llevada a cabo por el pueblo indígena de Cherán, en México. En el centro del argumento, la propuesta presenta el caso como una imagen del sufrimiento y crítica a la idea de Estado nación en la que el Buen gobierno se alza como una forma decolonial más allá de la línea abismal moderna

  5. Nuevas modalidades de captación de rentas ilegales en Medellín

    OpenAIRE

    Giraldo Ramírez, Jorge; Rendón Cardona, Andrés Julián; Duncan Cruz, Gustavo

    2014-01-01

    El fenómeno de la criminalidad en Medellín, como en otras ciudades, ofrece unas facetas nuevas; cambia, se transforma. Aunque no es una tarea sencilla, tenemos que buscar el análisis estructural de una economía criminal, pasando de la cuantificación de los homicidios a las articulaciones del crimen organizado. Nosotros desde la administración, los académicos, los expertos, los movimientos políticos, el sector privado y las organizaciones sociales estamos en la obligación de conocer a fondo es...

  6. Las nuevas tecnologías: ¿Progreso o exclusión?

    Directory of Open Access Journals (Sweden)

    Lidia Borgaminck de de la Torre

    2015-01-01

    Full Text Available Se consideran algunos conceptos como: la problemática del acceso vinculado con diferencias socioeconómicas y el uso que los jóvenes hacen de los medios, en este caso de las nuevas tecnologías -computadora e Internet en relación con la motivación. Referentes de este trabajo fueron las teorías de la comunicación provenientes de la sociología y la sicología de la comunicación.

  7. La formación de la conciencia moral en la Universidad Militar Nueva Granada

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Vargas Vargas

    2008-01-01

    Full Text Available Este artículo presenta los hallazgos obtenidos en la investigación titulada "Formación de la conciencia moral en la Universidad Militar Nueva Granada", partiendo de las teorías del desarrollo moral propuestas por Piaget y Kohlberg. El diagnóstico nos enfrenta a la responsabilidad que tienen las instituciones de Educación Superior frente a la formación de sujetos con una moral de principios, de justicia social y de reconocimiento de los otros y a la búsqueda de procesos pedagógicos que posibiliten estos desarrollos.

  8. Kaelum : emprender y crear una nueva agencia de comunicación

    OpenAIRE

    Gallés Faz, Carlota; Universitat Autònoma de Barcelona. Facultat de Ciències de la Comunicació

    2016-01-01

    Projecte pensat per a posar fonament a una nova agència de comunicació que actuaria en el món de la comunicació digital, els esdeveniments i les solucions TIC. Proyecto pensado para marcar las bases de una nueva agencia de comunicación que actuaria en el ámbito de la comunicación digital, los eventos y las soluciones TIC. Project designed to lay the technical basics for starting a new communications agency who is going to intervene on the digital communication, events and TIC sphere....

  9. Biocontabilidad: Hacia una definición de una nueva disciplina contable.

    OpenAIRE

    Mejía Soto, Eutimio

    2014-01-01

    La biocontabilidad se plantea como una nueva disciplina que pertenece a la ciencia contable, constituyendo así, un modelo que en conjunto con la sociocontabilidad y la contabilidad económica, configuran la Teoría tridimensional de la contabilidad T3C. La definición de biocontabilidad sugerida, principal objetivo de la investigación, se infiere de la definición general de contabilidad propuesta por la T3C y, metodológicamente, se soporta en los ítems básicos que debe tener toda acepción de un ...

  10. Lista preliminar de las heliconias de Colombia y cinco especies nuevas

    Directory of Open Access Journals (Sweden)

    Kress W. Jhon

    1993-12-01

    Full Text Available A preliminary check list of the 93 species of Heliconia currently recognized from Colombia is provided. Five new species of subgen. Griggsia (H. arrecta, H. donstonea, H. gigantea, H.terciopete y H. titanum from that country are also described, ilustrated, and discussed.Se proporciona una lista preliminar de las 93 especies de Heliconia reconocidas para Colombia. Además se describen, ilustran y comentan cinco especies nuevas pertenecientes al subgénero Griggsia (H. arrecta, H. donstonea, H. gigantea, H. terciopela y H. titanum.

  11. THE ABSOLUTE MAGNITUDE OF RRc VARIABLES FROM STATISTICAL PARALLAX

    International Nuclear Information System (INIS)

    Kollmeier, Juna A.; Burns, Christopher R.; Thompson, Ian B.; Preston, George W.; Crane, Jeffrey D.; Madore, Barry F.; Morrell, Nidia; Prieto, José L.; Shectman, Stephen; Simon, Joshua D.; Villanueva, Edward; Szczygieł, Dorota M.; Gould, Andrew; Sneden, Christopher; Dong, Subo

    2013-01-01

    We present the first definitive measurement of the absolute magnitude of RR Lyrae c-type variable stars (RRc) determined purely from statistical parallax. We use a sample of 242 RRc variables selected from the All Sky Automated Survey for which high-quality light curves, photometry, and proper motions are available. We obtain high-resolution echelle spectra for these objects to determine radial velocities and abundances as part of the Carnegie RR Lyrae Survey. We find that M V,RRc = 0.59 ± 0.10 at a mean metallicity of [Fe/H] = –1.59. This is to be compared with previous estimates for RRab stars (M V,RRab = 0.76 ± 0.12) and the only direct measurement of an RRc absolute magnitude (RZ Cephei, M V,RRc = 0.27 ± 0.17). We find the bulk velocity of the halo relative to the Sun to be (W π , W θ , W z ) = (12.0, –209.9, 3.0) km s –1 in the radial, rotational, and vertical directions with dispersions (σ W π ,σ W θ ,σ W z ) = (150.4, 106.1, 96.0) km s -1 . For the disk, we find (W π , W θ , W z ) = (13.0, –42.0, –27.3) km s –1 relative to the Sun with dispersions (σ W π ,σ W θ ,σ W z ) = (67.7,59.2,54.9) km s -1 . Finally, as a byproduct of our statistical framework, we are able to demonstrate that UCAC2 proper-motion errors are significantly overestimated as verified by UCAC4

  12. Refractive error magnitude and variability: Relation to age.

    Science.gov (United States)

    Irving, Elizabeth L; Machan, Carolyn M; Lam, Sharon; Hrynchak, Patricia K; Lillakas, Linda

    2018-03-19

    To investigate mean ocular refraction (MOR) and astigmatism, over the human age range and compare severity of refractive error to earlier studies from clinical populations having large age ranges. For this descriptive study patient age, refractive error and history of surgery affecting refraction were abstracted from the Waterloo Eye Study database (WatES). Average MOR, standard deviation of MOR and astigmatism were assessed in relation to age. Refractive distributions for developmental age groups were determined. MOR standard deviation relative to average MOR was evaluated. Data from earlier clinically based studies with similar age ranges were compared to WatES. Right eye refractive errors were available for 5933 patients with no history of surgery affecting refraction. Average MOR varied with age. Children <1 yr of age were the most hyperopic (+1.79D) and the highest magnitude of myopia was found at 27yrs (-2.86D). MOR distributions were leptokurtic, and negatively skewed. The mode varied with age group. MOR variability increased with increasing myopia. Average astigmatism increased gradually to age 60 after which it increased at a faster rate. By 85+ years it was 1.25D. J 0 power vector became increasingly negative with age. J 45 power vector values remained close to zero but variability increased at approximately 70 years. In relation to comparable earlier studies, WatES data were most myopic. Mean ocular refraction and refractive error distribution vary with age. The highest magnitude of myopia is found in young adults. Similar to prevalence, the severity of myopia also appears to have increased since 1931. Copyright © 2018 Spanish General Council of Optometry. Published by Elsevier España, S.L.U. All rights reserved.

  13. Coda-derived source spectra, moment magnitudes and energy-moment scaling in the western Alps

    Science.gov (United States)

    Morasca, P.; Mayeda, K.; Malagnini, L.; Walter, William R.

    2005-01-01

    A stable estimate of the earthquake source spectra in the western Alps is obtained using an empirical method based on coda envelope amplitude measurements described by Mayeda et al. for events ranging between MW~ 1.0 and ~5.0. Path corrections for consecutive narrow frequency bands ranging between 0.3 and 25.0 Hz were included using a simple 1-D model for five three-component stations of the Regional Seismic network of Northwestern Italy (RSNI). The 1-D assumption performs well, even though the region is characterized by a complex structural setting involving strong lateral variations in the Moho depth. For frequencies less than 1.0 Hz, we tied our dimensionless, distance-corrected coda amplitudes to an absolute scale in units of dyne cm by using independent moment magnitudes from long-period waveform modelling for three moderate magnitude events in the region. For the higher frequencies, we used small events as empirical Green's functions, with corner frequencies above 25.0 Hz. For each station, the procedure yields frequency-dependent corrections that account for site effects, including those related to fmax, as well as to S-to-coda transfer function effects. After the calibration was completed, the corrections were applied to the entire data set composed of 957 events. Our findings using the coda-derived source spectra are summarized as follows: (i) we derived stable estimates of seismic moment, M0, (and hence MW) as well as radiated S-wave energy, (ES), from waveforms recorded by as few as one station, for events that were too small to be waveform modelled (i.e. events less than MW~ 3.5); (ii) the source spectra were used to derive an equivalent local magnitude, ML(coda), that is in excellent agreement with the network averaged values using direct S waves; (iii) scaled energy, , where ER, the radiated seismic energy, is comparable to results from other tectonically active regions (e.g. western USA, Japan) and supports the idea that there is a fundamental

  14. Radiation protection

    International Nuclear Information System (INIS)

    Koelzer, W.

    1975-01-01

    Physical and radiological terms, quantities, and units. Basic principles of radiation protection (ICRP, IAEA, EURATOM, FRG). Biological effects of ionizing radiation. Objectives of practical radiation protection. (HP) [de

  15. The Movement of Tlaxcaltecas Indians Families to North Region of Nueva Galicia (Virreinato de la Nueva España). A Policy of Colonization and Pacification of the Spanish Empire at the End of the XVI Century

    OpenAIRE

    José Rojas Galván

    2016-01-01

    At the end of the XVI century, the Spanish empire had the necessity to create a series of strategies to access deposits of metal deposits located them in the North of Nueva España. These metal deposits were very important to the colony economy. The porpouse of this text in to analize the colonization and pacification policy that the Spanish goverment used in the North of Nueva Galicia during this history period of time, in which a group of tlaxcaltecas families took the leading role. The meth...

  16. Guía del investigador americanista: La Universidad de Tulane en Nueva Orleáns

    OpenAIRE

    Betancourt, Margarita Vargas

    2009-01-01

    Introducción La Universidad de Tulane se encuentra en una de las ciudades más interesantes de Estados Unidos, y probablemente, una de las ciudades norteamericanas que más se parece a las ciudades de Latino América: Nueva Orleáns. Copyright © (fotografías de Daniela Castillo y James Huck) Ejemplo de ello es que Nueva Orleáns tiene un centro histórico (el barrio francés) y una plaza o zócalo (Jackson Square). Antes de que Napoleón vendiera Luisiana a Thomas Jefferson en 1803, Nueva Orleáns fue...

  17. Cibercultura, ciberciudad, cibersociedad. Hacia la construcción de mundos posibles en nuevas metáforas conceptuales

    Directory of Open Access Journals (Sweden)

    Jesús Galindo Cáceres

    2008-12-01

    Full Text Available En este artículo se reflexiona sobre las nuevas formas de sociabilidad, las modificaciones en la percepción espacio-temporal, las reconfiguraciones territoriales que la nueva estructuración de la información impone. Se trata del pasaje de sociedades informáticas y de las de comunicación hacia las cibersociedades, caracterizadas por un tipo de organización de la información horizontal, que supone un aprovechamiento múltiple del espacio virtual, y de las posibilidades de interacción y de interconexión entre los sujetos. Estas cibersociedades y ciberculturas introducen una mudanza en las formas de actuar y de percibir lo social: horizontal, multinteractiva, y expansiva. Alejado del esquema vertical, las nuevas ecologías y sociabilidades invitan a transformar e l mundo real a través del mundo virtual.

  18. Large Contrast Between the Moment Magnitude of Tremor and the Moment Magnitude of Slip in ETS Events

    Science.gov (United States)

    Kao, H.; Wang, K.; Dragert, H.; Rogers, G. C.; Kao, J. Y.

    2009-12-01

    We have developed an algorithm to estimate the moment magnitudes (Mw) of seismic tremors that are recorded during episodic tremor and slip (ETS) events beneath the northern Cascadia margin. The tremor “cloud” during an ETS episode consists of numerous individual tremor bursts. For each tremor burst, the hypocenter is first determined by the Source-Scanning Algorithm [Kao and Shan, 2004]. From the derived source location, we calculate a set of synthetic seismograms for each station based on a fixed seismic moment but different focal mechanisms. The maximum tremor amplitude observed at each station is then compared to that of the synthetics to give an estimate of the corresponding seismic moment of the tremor burst. The seismic moment averaged over all stations is used to calculate the final tremor burst Mw. We have applied this method to local earthquakes for calibration and the results are very consistent with the magnitudes listed in the catalogue. For each of the 8 northern Cascadia ETS episodes whose GPS coverage is sufficient for slip distribution inversion, the cumulative tremor Mw for the entire tremor cloud, determined from the combined moments of all individual tremor bursts in the ETS episode, is ~3 orders less than the corresponding slip Mw in the same episode (e.g., 3.7 vs. 6.7). This result suggests that aseismic slip is the predominant mode of deformation during ETS. The majority of individual tremor bursts in northern Cascadia have Mw ranging between 1.0 and 1.7 with the mean of 1.34. Only 5% of all tremors are larger than 2.0 with the largest being ~2.5.

  19. THE ABSOLUTE MAGNITUDE OF RRc VARIABLES FROM STATISTICAL PARALLAX

    Energy Technology Data Exchange (ETDEWEB)

    Kollmeier, Juna A.; Burns, Christopher R.; Thompson, Ian B.; Preston, George W.; Crane, Jeffrey D.; Madore, Barry F.; Morrell, Nidia; Prieto, José L.; Shectman, Stephen; Simon, Joshua D.; Villanueva, Edward [Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Szczygieł, Dorota M.; Gould, Andrew [Department of Astronomy, The Ohio State University, 4051 McPherson Laboratory, Columbus, OH 43210 (United States); Sneden, Christopher [Department of Astronomy, University of Texas at Austin, TX 78712 (United States); Dong, Subo [Institute for Advanced Study, 500 Einstein Drive, Princeton, NJ 08540 (United States)

    2013-09-20

    We present the first definitive measurement of the absolute magnitude of RR Lyrae c-type variable stars (RRc) determined purely from statistical parallax. We use a sample of 242 RRc variables selected from the All Sky Automated Survey for which high-quality light curves, photometry, and proper motions are available. We obtain high-resolution echelle spectra for these objects to determine radial velocities and abundances as part of the Carnegie RR Lyrae Survey. We find that M{sub V,RRc} = 0.59 ± 0.10 at a mean metallicity of [Fe/H] = –1.59. This is to be compared with previous estimates for RRab stars (M{sub V,RRab} = 0.76 ± 0.12) and the only direct measurement of an RRc absolute magnitude (RZ Cephei, M{sub V,RRc} = 0.27 ± 0.17). We find the bulk velocity of the halo relative to the Sun to be (W{sub π}, W{sub θ}, W{sub z} ) = (12.0, –209.9, 3.0) km s{sup –1} in the radial, rotational, and vertical directions with dispersions (σ{sub W{sub π}},σ{sub W{sub θ}},σ{sub W{sub z}}) = (150.4, 106.1, 96.0) km s{sup -1}. For the disk, we find (W{sub π}, W{sub θ}, W{sub z} ) = (13.0, –42.0, –27.3) km s{sup –1} relative to the Sun with dispersions (σ{sub W{sub π}},σ{sub W{sub θ}},σ{sub W{sub z}}) = (67.7,59.2,54.9) km s{sup -1}. Finally, as a byproduct of our statistical framework, we are able to demonstrate that UCAC2 proper-motion errors are significantly overestimated as verified by UCAC4.

  20. Is Fish Response related to Velocity and Turbulence Magnitudes? (Invited)

    Science.gov (United States)

    Wilson, C. A.; Hockley, F. A.; Cable, J.

    2013-12-01

    Riverine fish are subject to heterogeneous velocities and turbulence, and may use this to their advantage by selecting regions which balance energy expenditure for station holding whilst maximising energy gain through feeding opportunities. This study investigated microhabitat selection by guppies (Poecilia reticulata) in terms of the three-dimensional velocity structure generated by idealised boulders in an experimental flume. Velocity and turbulence influenced intra-species variation in swimming behaviour with respect to size, sex and parasite intensity. With increasing body length, fish swam further and more frequently between boulder regions. Larger guppies spent more time in the high velocity and low turbulence region, whereas smaller guppies preferred the low velocity and high shear stress region directly behind the boulders. Male guppies selected the region of low velocity, indicating a possible reduced swimming ability due to hydrodynamic drag imposed by their fins. With increasing parasite (Gyrodactylus turnbulli) burden, fish preferentially selected the region of moderate velocity which had the lowest bulk measure of turbulence of all regions and was also the most spatially homogeneous velocity and turbulence region. Overall the least amount of time was spent in the recirculation zone which had the highest magnitude of shear stresses and mean vertical turbulent length scale to fish length ratio. Shear stresses were a factor of two greater than in the most frequented moderate velocity region, while mean vertical turbulent length scale to fish length ratio were six times greater. Indeed the mean longitudinal turbulent scale was 2-6 times greater than the fish length in all regions. While it is impossible to discriminate between these two turbulence parameters (shear stress and turbulent length to fish length ratio) in influencing the fish preference, our study infers that there is a bias towards fish spending more time in a region where both the bulk

  1. El cultivo del trigo en Nueva Galicia durante el siglo XVII

    Directory of Open Access Journals (Sweden)

    René de León Meza

    2016-01-01

    Full Text Available Este artículo estudia los factores que determinaron el desarrollo y consolidación del cultivo del trigo en varias comarcas del reino de Nueva Galicia durante el siglo xvii tomando como referencia la última fundación de Guadalajara. Destaca lo vital que fue para esta industria la mano de obra indígena a través del sistema de repartimiento forzado y la vigencia de este hasta el siglo xviii en contraste con Nueva España donde fue suprimido desde 1633. La hipótesis aquí planteada es que la escasez de trigo y harina que constantemente sufrieron los habitantes de la ciudad de Guadalajara se debió a la confabulación de las autoridades del Cabildo con los comerciantes y productores para acapararlos, esconderlos y luego venderlos a precios elevados. La política que los regidores implementaron de no instalar una alhóndiga que concentrara y regulara la venta de esos productos confirma el anterior aserto.

  2. Una nueva especie de Bolitoglossa (Caudata: Plethodontidae de las selvas del Magdalena Medio en Colombia

    Directory of Open Access Journals (Sweden)

    Acosta Galvis Andrés R.

    2001-12-01

    Full Text Available Se describe una nueva especie del genero Bolitoglossa del grupo alfa (sensu Wake & Lynch, 1976 denominada Bolitoglossa lozanoi de las selvas húmedas relictuales del valle del Río Magdalena en La Cordillera Central de Colombia (loe. typ.: Río La Miel, Mpio. La Victoria, Departamento de Caldas, 500 m.s.n.m.; la nueva especie es reconocible por su cuerpo robusto, las palmeaduras manuales y pediales extensas, su patrón cromático ventral café con punteaduras café más oscuras y crema, ojos no protuberantes y la talla corporal relativamente grande entre las especies de salamandras del país. A new species of the genus Bolitoglossa, of the alpha group (sensu Wake & Lynch, 1976 named Bolitoglossa lozanoi from the relictual humid forest from the Magdalena Valley on the eastern slope ofthe central Andes Mountain range in Colombia (type locality: La Miel River, Mpio. La Victoria, Dept. of Caldas, 500 m.s.n.m.. The new species is mainly recognized by the presence of a robust body, extensively webbed hands and toes, a brownish ventral chromatic pattern with small darker brown and cream dots, non-protuberant eyes and a relatively large size.

  3. APLICACIÓN DE LAS COMUNICACIONES Y NUEVAS TECNOLOGÍAS AL CAMPO DEL APRENDIZAJE MOTOR

    Directory of Open Access Journals (Sweden)

    A. Oña

    2010-09-01

    Full Text Available

    RESUMEN

    En este artículo exponemos las posibilidades de las Nuevas Tecnologías en el campo del Aprendizaje Motor. Explicaremos con detalle las aplicaciones en Investigación, los programas informáticos especializados, las comunicaciones e Internet, el aprendizaje por modelos y práctica asistida, la Simulación y Realidad Virtual y la Tele-educación.
    PALABRAS CLAVE:Nuevas Tecnologías, Informática, Aprendizaje Motor, Comunicaciones e Internet

     

    ABSTRACT

    We expose in this paper the posibilities of News Technologies in Motor Learning. We will explain in detail the aplications in Research, Apply Software, Communications and Internet, Modeling Learning Practice Assisted, Simulation,Virtual Reality and Tele-Education.
    KEY WORDS: News Technologies, computer Science, Motor Learning, Communications and Internet.

     

  4. La binaria LSS 3074 y su entorno: ?`una nueva asociación OB?

    Science.gov (United States)

    Niemela, V.; Morrell, N.; Corti, M.

    En este trabajo presentamos un nuevo análisis orbital de LSS~3074, junto con tipos espectrales y velocidades radiales de estrellas que podrían constituir con ella una nueva asociación OB. La estrella O4f LSS3074 fue descubierta como binaria espectroscópica de corto período y líneas dobles por Morrell & Niemela (1990, ASP Conf. Ser. 7, 57). Posteriormente, Haefner et~al.(1994, IBVS 3969) encontraron variaciones fotométricas, estimando una inclinación orbital entre 50o y 55o. Teniendo en cuenta la importancia de obtener valores empíricos para las masas de estrellas O tempranas, y considerando la gran dispersión existente entre los valores observados y su discrepancia con los predichos por los modelos teóricos, hemos obtenido nuevas observaciones espectroscópicas de este sistema, con el propósito de mejorar los elementos orbitales derivados en la solución preliminar. Además, como las estrellas O tempranas suelen formar parte de cúmulos y asociaciones OB, hemos llevado a cabo una investigación espectroscópica de varias estrellas tempranas que podrían estar físicamente relacionadas con LSS~3074.

  5. Administración económica, fiscal y de hacienda en la nueva Granada

    Directory of Open Access Journals (Sweden)

    Jacqueline Blanco Blanco

    2008-01-01

    Full Text Available Al examinar la administración económica del Estado durante la Nueva Granada, especialmente durante el gobierno del General Francisco de Paula Santander, se encuentra un importante esfuerzo por vincular el desarrollo económico del país a una propuesta de orden liberal orientada hacia la ampliación de la producción y el fortalecimiento del comercio, fundamentalmente el de exportación. El proyecto contrasta con el estado de pobreza en que se encontraba la economía rural basada principalmente en la explotación de la mano de obra esclava, con la languidez del comercio de productos como café, cacao, algodón y añil, y con el escaso desarrollo de la manufactura artesanal en el país. En consecuencia la vinculación al mercado internacional de la Nueva Granada durante este período resultó atropellada. La administración estatal del referido proyecto económico enfrentó la corrupción pública incontrolada, que desembocó en el progresivo deterioro del fisco, lo cual imposibilitó alcanzar los logros previstos en cuanto al mejoramiento de las condiciones sociales, culturales, educativas, y de bienestar material y general.

  6. Nuevas narrativas audiovisuales: multiplataforma, crossmedia y transmedia. El caso de Águila Roja (RTVE.

    Directory of Open Access Journals (Sweden)

    Carmen Costa Sanchez

    2012-07-01

    Full Text Available En la llamada era de la convergencia se ha producido la eclosión de nuevos tipos de narrativas que, basadas en las nuevas tecnologías, ponen un énfasis especial en la actividad del lector/espectador/usuario. La industria audiovisual se ha beneficiado de estas nuevas formas de contar historias, en particular, de aquellas que se valen de diferentes soportes y lenguajes para construir un relato unitario. Expresiones como multiplataforma, crossmedia o transmedia se utilizan con frecuencia para designar esta tipología de proyectos a los que se puede acceder desde diferentes plataformas con contenidos adecuados al lenguaje-forma de cada una de ellas (audiovisuales, textuales, hipertextuales, multimedia…. Entre estas narraciones, resultan de particular interés los proyectos transmedia en cuanto se trata de historias expandidas en diferentes medios y que permiten a los receptores obtener una experiencia unitaria –del contenido en un solo medio- o completa –con el disfrute de la totalidad de los componentes. En este sentido, desde la perspectiva del audiovisual español, resulta de particular interés Águila Roja. Este producto transmedia comenzó siendo una producción audiovisual convencional cuyo éxito de audiencia favoreció el desarrollo de una experiencia más amplia, que implicó el desarrollo y consolidación de su fenómeno fan.

  7. Nueva tecnología para la producción de Jarabe de Salbutamol

    Directory of Open Access Journals (Sweden)

    Iván G Morales Lacarrere

    2001-04-01

    Full Text Available Se presenta una nueva tecnología para la producción del jarabe de salbutamol, con el propósito de eliminar los problemas de estabilidad químico-física que presentaba la formulación anterior y, como consecuencia de esto, su vida útil no rebasaba los 6 meses. Se logró obtener una nueva formulación que cumplió con todas las especificaciones de calidad exigidas para este medicamento. Se demostró que su vida útil se incrementó hasta 2 años almacenado a temperatura ambiente en su envase original.A new technology for the production of salbutamol syrup is presented aimed at eliminating the problems of chemical and physical stability of the previous formulation, which had a useful life of less than 6 months. It was possible to obtain a new formulation that met all the quality specifications required for this drug. It was proved that its useful life increased up to 2 years stored at room temperature in its original bottle.

  8. DETERMINANTES DE LA PROBABILIDAD DE CIERRE DE NUEVAS EMPRESAS EN BOGOTÁ

    Directory of Open Access Journals (Sweden)

    JUAN FELIPE PARRA

    2011-01-01

    Full Text Available El artículo analiza los determinantes de la probabilidad de cerrar una firma nueva en el mercado antes de que alcance sus primeros cinco años de actividades. Se estudian las condiciones macroeconómicas y microeconómicas que experimentaron estas empresas en Bogotá durante su primer lustro. El estudio revela que hay indicios para afirmar que el tamaño óptimo de entrada es el de pequeña y mediana empresa (PYMEs. Entre los principales hallazgos de la investigación están, en primer lugar, que las empresas más proclives a la quiebra prematura son las microempresas, en segundo lugar, para algunas empresas el endeudamiento moderado puede ser útil para apalancarse, pero el alto endeudamiento, finalmente, se verificó que, tanto el sector económico, como la localidad en la que abre sus puertas la nueva empresa, son determinantes en su probabilidad de cerrar antes de los primeros cinco años.

  9. Khat: ¿Una nueva droga?/Khat: A new drug?

    Directory of Open Access Journals (Sweden)

    Aitor Curiel López de Arcaute (España

    2008-08-01

    Full Text Available Una nueve droga surgió el Barcelona procedente de África subsahariana interceptada en un vuelo con destino a Nueva York. La droga conocida como Khat no es una droga nueva, es una planta de la antigüedad que surge entre los arbustos de café y se cultiva en Etiopia y Yemen y en menos escala en Kenia, Tanzania, Madagascar y Uganda. En la actualidad muchas personas consumen Khat. El costo de esta raíz varía desde 1 euro hasta 600 euros por Kg. Los efectos de esta planta son similares a los de anfetamina que producen los ingredientes activos de esta raíz los cuales están prohibidos por la ONU y la OMS. A new drug emerged in Barcelona, coming from sub-Saharan Africa, intercepted on a flight bound for New York. The drug known as Khat is not a new drug, is a plant of antiquity that emerges in the coffee bushes and cultivated in Ethiopia and Yemen and less scale in Kenya, Tanzania, Madagascar and Uganda. Nowadays many people consume Khat. The cost of this root varies from 1 euro up to 600 euros per Kg. The effects of this plant are similar to amphetamine that produce the active ingredients of this root which are prohibited by the UN and the WHO.

  10. Educación y sociedad: una nueva visión para el siglo XXI

    Directory of Open Access Journals (Sweden)

    Ferran Ferrer

    1998-01-01

    Full Text Available El articulo presenta los rasgos más definitorios de la educación del próximo siglo. Con esta visión prospectiva parte, en primer lugar de las características más significativas de la sociedad presente y futura. Entre otros as pecios resalla su multiculturalidad, su envejecimiento poblacional, su interconectivad a través de las nuevas tecnologías, su globalización, su interdependencia; en suma, su complejidad. Este breve análisis sociológico, que plantea el autor, es el paso previo para poder señalar los elementos distintivos de un modelo educativo que debe adaptarse a una situación nueva pero que también debe proporcionar instrumentos para su transformación. La educación intercultural, solidaria, critica, universalista. creativa. tanto en el marco formal, como no formal e informal constituirán, sin duda alguna, los fundamentos de una sociedad mejor en el futuro. 

  11. Rem Koolhaas: Delirio de Nueva York. Un manifiesto retroactivo para Manhattan

    Directory of Open Access Journals (Sweden)

    Rosa María Añón-Abajas

    2014-05-01

    Full Text Available Le conocemos principalmente por sus obras, tan grandes, rotundas y complejas, como polémicas; espectaculares obras que le han proporcionado numerosas distinciones. Pero Koolhaas también se ha ocupado de dejar escrita la teoría con la que ha alimentado y justificado su arquitectura. Entre sus textos destaca “Delirio de Nueva York. Un manifiesto retroactivo para Manhattan”. Publicado por primera vez en 1978, es gracias a la traducción al castellano realizada por Jorge Sainz y publicada por Gustavo Gili en 2004, que hoy cuenta con esta reseña; por esto considero importante empezar manifestando mi gratitud a cuantos han contribuido a esa edición en castellano. Delirio de Nueva York describe la metrópoli con una técnica impresionista, mediante sueltas pinceladas superpuestas, configura imágenes cotidianas de la metrópolis en sus momentos de máxima esfervescencia

  12. Nuevas Tecnologías y nuevos retos para el profesional de enfermería

    Directory of Open Access Journals (Sweden)

    M.ª Isabel Arandojo Morales

    Full Text Available La informatización y el uso de nuevas tecnologías es un proceso progresivo y cada vez más presente en nuestra sociedad y en nuestra profesión. Todas las áreas sanitarias están afectadas por este proceso de informatización. Pero todavía hay profesionales de Enfermería que tienen dificultades a la hora de utilizarlas, sobre todo aquellos que llevan más años de profesión y que pertenecen a la generación que "vio llegar la tecnología", con lo que han tenido que adaptarse a una nueva forma de trabajar a la que a muchos les cuesta acostumbrarse. El enfermero de hoy en día tiene un enorme reto en el aprovechamiento de los nuevos recursos tecnológicos para realizar su labor de una manera más eficiente, efectiva y en el menor tiempo posible y para desenvolverse con soltura en el acceso a la información y el conocimiento en salud, su gestión o la generación y difusión de nuevo conocimiento.

  13. La idea del derecho natural en la Ciencia Nueva. Giambattista Vico y América

    Directory of Open Access Journals (Sweden)

    Ma. Del Carmen Rovira Gaspar

    2015-01-01

    Full Text Available Este trabajo trata de mostrar y confirmar la modernidad presente en el pensamiento de Giambattista Vico en relación con la idea sobre el derecho natural ofrecida en las páginas de su libro Principios de una ciencia nueva sobre la naturaleza común de las naciones. Asimismo, trata de la opinión del filósofo italiano, en el mismo libro, sobre los pueblos del Nuevo Mundo que sufrieron la conquista. Oposición entre conquista y desarrollo histórico del pueblo conquistado. This work tries to show and confirm the modernity of the thought about natural right that Giambattista Vico offered in his book Principios de una ciencia nueva sobre la naturaleza común de las naciones. As well, deals with the italian philosopher opinion, in the same book, about the people in the New World who suffered the spanish conquest. Opposition between conquest an historical development of the conquered people.

  14. Teatro, comunicación y nuevas tecnologías

    Directory of Open Access Journals (Sweden)

    Virginia Guarinos

    2012-04-01

    Full Text Available El teatro en pleno siglo XXI ya no es sólo una forma de ocio, es un signo de cultura. En esa eterna polémica entre teatro y cine primero, entre cine y televisión después, la institución teatral ha pasado a convertirse en un tótem cultural, en marchamo de intelectualidad. Pero, independientemente de la verdad o no de este hecho, lo cierto es que la teatralidad, hoy por hoy, excede al mismo teatro y se expande a otras formas de ocio, otros discursos ficcionales o no y otros medios o manifestaciones artísticas. A la irrupción en nuestras vidas cotidianas de las nuevas tecnologías hay que sumar nuestra tendencia cultural occidental a la hibridación de los últimos tiempos. Y de ese modo también el teatro se ha visto afectado, en el buen sentido de la palabra, por dichas nuevas tecnologías y éstas por aquél.

  15. UNA ESPECIE NUEVA DE RANA DEL GÉNERO CHIASMOCLEIS (MICROHYLIDAE: GASTROPHRYNINAE DE LA CORDILLERA DEL CÓNDOR, ECUADOR

    Directory of Open Access Journals (Sweden)

    ANA ALMENDÁRIZ C.

    Full Text Available RESUMEN Se describe una especie nueva de rana del género Chiasmocleis de los bosques montanos del suroriente del Ecuador, en las laderas occidentales de la Cordillera del Cóndor, entre 1.025-1.630 m de altitud. En base a nuevas secuencias de ADN mitocondrial y nuclear presentamos las relaciones filogenéticas de la nueva especie y sus congéneres. La filogenia muestra una relación cercana a C. antenori, C. carvalhoi, C. magnova, y C. tridactyla. La nueva especie forma parte de un clado integrado por especies que previamente habían sido asignadas al género Syncope. Este clado es hermano de otro conformado por el resto de especies de Chiasmocleis. La nueva especie difiere de sus congéneres por su dorso café ladrillo a café obscuro (sepia cubierto por puntos diminutos blanco-amarillentos. Chiasmocleis parkeri sp. nov. se parece a Chiasmocleis antenori por la ausencia del dedo I, tanto en las manos como en los pies, pero difiere en la coloración, la disposición y tamaño de las manchas claras y la ausencia de una línea clara en la región cantal. La especie nueva presenta algunos rasgos que le distinguen de especies similares. Describimos el canto, caracterizado por tener notas sin pulsos y aportamos datos ecológicos de la localidad típica y áreas adyacentes.

  16. The role of the Secondary Laboratory of Dosimetric calibration in the implementation of the dosimetric magnitudes with radiological protection aims

    International Nuclear Information System (INIS)

    Perez Medina O, V.; Alvarez R, J.T.; Tovar M, V.M.

    2006-01-01

    It is very well-known the paper of the net of secondary laboratories of dosimetric calibration of the OAS in the dissemination of the traceability of the dosimetric magnitudes: kerma in air and absorbed dose in water, to the radiotherapy departments, given the high accuracy and precision that require the radiotherapy treatments. However the LSCD has other important areas at least for the development, implementation and evaluation of dosimetric magnitudes denominated operative magnitudes with ends of radiological protection: environmental equivalent dose H*(10), directional equivalent dose H'(0.07) and personal equivalent dose Hp. In the case of radiological protection the LSCD-ININ has been implementing the infrastructure to give service of personal dosimetry for photons and beta particles in terms of the operative magnitudes. For photons: X and gamma rays, it account with a secondary pattern camera PTW T34035 gauged in H * and Hp in the primary laboratory of Germany PTB. For the case of beta radiation its account with an extrapolation camera PTW 23392 with a secondary pattern kit of sources of the type I, gauged in terms of H'(0.07) in the PTB. (Author)

  17. IAU 2015 Resolution B2 on Recommended Zero Points for the Absolute and Apparent Bolometric Magnitude Scales

    DEFF Research Database (Denmark)

    Mamajek, E. E.; Torres, G.; Prsa, A.

    2015-01-01

    The XXIXth IAU General Assembly in Honolulu adopted IAU 2015 Resolution B2 on recommended zero points for the absolute and apparent bolometric magnitude scales. The resolution was proposed by the IAU Inter-Division A-G Working Group on Nominal Units for Stellar and Planetary Astronomy after...... consulting with a broad spectrum of researchers from the astronomical community. Resolution B2 resolves the long-standing absence of an internationally-adopted zero point for the absolute and apparent bolometric magnitude scales. Resolution B2 defines the zero point of the absolute bolometric magnitude scale...... such that a radiation source with $M_{\\rm Bol}$ = 0 has luminosity L$_{\\circ}$ = 3.0128e28 W. The zero point of the apparent bolometric magnitude scale ($m_{\\rm Bol}$ = 0) corresponds to irradiance $f_{\\circ}$ = 2.518021002e-8 W/m$^2$. The zero points were chosen so that the nominal solar luminosity (3.828e26 W...

  18. La educación en el marco de una sociedad global: algunos principios y nuevas exigencias

    Directory of Open Access Journals (Sweden)

    José Tejada Fernández

    2000-01-01

    Full Text Available El presente artículo sobre la «Educación en el marco de una sociedad global: principios y nuevas exigencias», pretende centrar algunas de los rasgos de la sociedad actual (globalización, multiculturalismo, revolución tecnológica e incertidumbre a partir de los cuales ha de operar la educación. Esto conlleva un conjunto de cambios (estructurales y en la propia práctica, fundamentados en nuevos principios, y por tanto, nuevas exigencias para que la educación pueda dar respuesta en dicha sociedad.

  19. Drymonia squamosa (Gesneriaceae, una especie nueva del Parque Nacional Natural Las Orquídeas (Antioquia, Colombia

    Directory of Open Access Journals (Sweden)

    LAURA CLAVIJO

    2015-01-01

    Full Text Available Se describe e ilustra una especie nueva de Drymonia (Gesneriaceae de la Cordillera Occidental de los Andes colombianos, departamento de Antioquia. La nueva especie, Drymonia squamosa, se distingue por tener los pecíolos cubiertos con escamas, el envés de la lámina foliar glabrescente y punteado, el cáliz con la base engrosada y los lóbulos lanceolados, la corola vilosa a lanosa, y el estilo con tricomas glandulares. Adicionalmente, D. squamosa es categorizada como vulnerable (VU siguiendo los criterios de la IUCN.

  20. Taxonomía e importancia clínica de las nuevas familias del orden Chlamydiales

    OpenAIRE

    MARTÍNEZ T., M. ANGÉLICA; DIOMEDI P., ALEXIS; KOGAN A., RICARDO; BORIE P., CONSUELO

    2001-01-01

    Esta revisión comprende los cambios trascendentales que se han producido recientemente en la taxonomía de clamidias, la importancia clínica de las nuevas especies del orden Chlamydiales y los métodos para su identificación. La nueva clasificación del orden Chlamydiales se basa en las características fenotípicas, antigénicas, rango de huésped y análisis filogenético del operón ribosomal y proporciona un procedimiento consistente para la identificación de las actuales especies y el establecimie...

  1. BOMBACACEAE NEOTROPICAE NOVAE VEL MINUS COGNITAE IX. UNA NUEVA ESPECIE DE MATISIA BONPL. DEL CHOCÓ BIOGEOGRÁFICO

    Directory of Open Access Journals (Sweden)

    Fernandez José

    2011-12-01

    Full Text Available Como parte de la revisión de las especies de la sección Calyculatae del género Matisia Bonpl. (Malvaceae - Matisieae que actualmente se adelanta, se describe e ilustra aquí Matisia pacifica, una especie nueva circunscrita a la región del Chocó Biogeográfico. Se incluye también la descripción ampliada de la especie M. bracteolosa Ducke s. str. cuya distribución se restringe a la cuenca amazónica. Se comenta su relación y posibles afinidades con la especie nueva que se describe.

  2. Las campañas electorales en la nueva sociedad de la información y el conocimiento

    OpenAIRE

    Valdez Zepeda, Andrés

    2010-01-01

    El artículo trata sobre los principales cambios que las campañas electorales han experimentado en los últimos años en América Latina, subrayando las nuevas características distintivas y tendencias de este tipo de campañas, a la luz de lo que se conoce como el constructo de la nueva sociedad de la información y el conocimiento. The article discusses the main changes the electoral campaigns in Latin America have experienced in recent years, highlighting the distinctive features and new trend...

  3. El modelo de articulación entre la universidad militar Nueva Granada y la educación media

    OpenAIRE

    Cantor, Carlos Fernando

    2016-01-01

    Con el fin de responder a necesidades sociales de los municipios de la Sabana-Centro en Cundinamarca, la Universidad Militar Nueva Granada – UMNG, ha formulado y viene desarrollando el “Modelo de articulación entre la Universidad Militar Nueva Granada y la educación media”. Es una estrategia pedagógica que brinda oportunidades a estudiantes de décimo y undécimo, para el mejoramiento de 1) competencias cognitivas en matemática, física, química y lecto-escritura, y/o 2) competencias laborales e...

  4. First measurement of σ8 using supernova magnitudes only

    Science.gov (United States)

    Castro, Tiago; Quartin, Miguel

    2014-09-01

    A method was recently proposed which allows the conversion of the weak-lensing effects in the Type Ia supernova (SNeIa) Hubble diagram from noise into signal. Such signal is sensitive to the growth of structure in the universe, and in particular can be used as a measurement of σ8 independently from more traditional methods such as those based on the cosmic microwave background, cosmic shear or cluster abundance. We extend here that analysis to allow for intrinsic non-Gaussianities in the supernova probability distribution function, and discuss how this can be best modelled using the Bayes factor. Although it was shown that a precise measurement of σ8 requires ˜105 SNeIa, current data already allow an important proof of principle. In particular, we make use of the 706 supernovae with z ≤ 0.9 of the recent Joint Lightcurve Analysis catalogue and show that a simple treatment of intrinsic non-Gaussianities with a couple of nuisance parameters is enough for our method to yield the values σ _8 = 0.84^{+0.28}_{-0.65} or σ8 < 1.45 at a 2σ confidence level. This result is consistent with mock simulations and it is also in agreement with independent measurements and presents the first ever measurement of σ8 using SNeIa magnitudes alone.

  5. THE AGE OF ELLIPTICALS AND THE COLOR-MAGNITUDE RELATION

    International Nuclear Information System (INIS)

    Schombert, James; Rakos, Karl

    2009-01-01

    Using new narrowband color observations of early-type galaxies in clusters, we reconstruct the color-magnitude relation (CMR) with a higher degree of accuracy than previous work. We then use the spectroscopically determined ages and metallicities from three samples, combined with multimetallicity spectral energy distribution models, to compare predicted colors for galaxies with young ages (less than 8 Gyr) with the known CMR. We find that the CMR cannot by reproduced by the spectroscopically determined ages and metallicities in any of the samples despite the high internal accuracies to the spectroscopic indices. In contrast, using only the (Fe) index to determine [Fe/H], and assuming a mean age of 12 Gyr for a galaxy's stellar population, we derive colors that exactly match not only the color zero point of the CMR but also its slope. We consider the source of young age estimates, the Hβ index, and examine the conflict between red continuum colors and large Hβ values in galaxy spectra. We conclude that our current understanding of stellar populations is insufficient to correctly interpret Hβ values.

  6. Magnitude Squared of Coherence to Detect Imaginary Movement

    Directory of Open Access Journals (Sweden)

    Sady Antônio Santos Filho

    2009-01-01

    Full Text Available This work investigates the Magnitude Squared of Coherence (MSC for detection of Event Related Potentials (ERPs related to left-hand index finger movement. Initially, ERP presence was examined in different brain areas. To accomplish that, 20 EEG channels were used, positioned according to the 10–20 international system. The grand average, resulting from 10 normal subjects showed, as expected, responses at frontal, central, and parietal areas, particularly evident at the central area (C3, C4, Cz. The MSC, applied to movement imagination related EEG signals, detected a consistent response in frequencies around 0.3–1 Hz (delta band, mainly at central area (C3, Cz, and C4. Ability differences in control imagination among subjects produced different detection performance. Some subjects needed up to 45 events for a detectable response, while for some others only 10 events proved sufficient. Some subjects also required two or three experimental sessions in order to achieve detectable responses. For one subject, response detection was not possible at all. However, due to brain plasticity, it is plausible to expect that training sessions (to practice movement imagination improve signal-noise ratio and lead to better detection using MSC. Results are sufficiently encouraging as to suggest further exploration of MSC for future BCI application.

  7. Size matters: Perceived depth magnitude varies with stimulus height.

    Science.gov (United States)

    Tsirlin, Inna; Wilcox, Laurie M; Allison, Robert S

    2016-06-01

    Both the upper and lower disparity limits for stereopsis vary with the size of the targets. Recently, Tsirlin, Wilcox, and Allison (2012) suggested that perceived depth magnitude from stereopsis might also depend on the vertical extent of a stimulus. To test this hypothesis we compared apparent depth in small discs to depth in long bars with equivalent width and disparity. We used three estimation techniques: a virtual ruler, a touch-sensor (for haptic estimates) and a disparity probe. We found that depth estimates were significantly larger for the bar stimuli than for the disc stimuli for all methods of estimation and different configurations. In a second experiment, we measured perceived depth as a function of the height of the bar and the radius of the disc. Perceived depth increased with increasing bar height and disc radius suggesting that disparity is integrated along the vertical edges. We discuss size-disparity correlation and inter-neural excitatory connections as potential mechanisms that could account for these results. Copyright © 2016 Elsevier Ltd. All rights reserved.

  8. Properties of the Magnitude Terms of Orthogonal Scaling Functions.

    Science.gov (United States)

    Tay, Peter C; Havlicek, Joseph P; Acton, Scott T; Hossack, John A

    2010-09-01

    The spectrum of the convolution of two continuous functions can be determined as the continuous Fourier transform of the cross-correlation function. The same can be said about the spectrum of the convolution of two infinite discrete sequences, which can be determined as the discrete time Fourier transform of the cross-correlation function of the two sequences. In current digital signal processing, the spectrum of the contiuous Fourier transform and the discrete time Fourier transform are approximately determined by numerical integration or by densely taking the discrete Fourier transform. It has been shown that all three transforms share many analogous properties. In this paper we will show another useful property of determining the spectrum terms of the convolution of two finite length sequences by determining the discrete Fourier transform of the modified cross-correlation function. In addition, two properties of the magnitude terms of orthogonal wavelet scaling functions are developed. These properties are used as constraints for an exhaustive search to determine an robust lower bound on conjoint localization of orthogonal scaling functions.

  9. Effects of magnitude, depth, and time on cellular seismology forecasts

    Science.gov (United States)

    Fisher, Steven Wolf

    This study finds that, in most cases analyzed to date, past seismicity tends to delineate zones where future earthquakes are likely to occur. Network seismicity catalogs for the New Madrid Seismic Zone (NMSZ), Australia (AUS), California (CA), and Alaska (AK) are analyzed using modified versions of the Cellular Seismology (CS) method of Kafka (2002, 2007). The percentage of later occurring earthquakes located near earlier occurring earthquakes typically exceeds the expected percentage for randomly distributed later occurring earthquakes, and the specific percentage is influenced by several variables, including magnitude, depth, time, and tectonic setting. At 33% map area coverage, hit percents are typically 85-95% in the NMSZ, 50-60% in AUS, 75-85% in CA, and 75-85% in AK. Statistical significance testing is performed on trials analyzing the same variables so that the overall regions can be compared, although some tests are inconclusive due to the small number of earthquake sample sizes. These results offer useful insights into understanding the capabilities and limits of CS studies, which can provide guidance for improving the seismicity-based components of seismic hazard assessments.

  10. [Early hypophosphataemia in at risk newborns. Frequency and magnitude].

    Science.gov (United States)

    Bustos Lozano, Gerardo; Hidalgo Romero, Álvaro; Melgar Bonis, Ana; Ureta Velasco, Noelia; Orbea Gallardo, Carlos; Pallás Alonso, Carmen

    2018-04-01

    To determine the frequency and magnitude of neonatal hypophosphataemia (32 weeks with weight

  11. Ultrasound Evaluation of the Magnitude of Pneumothorax: A New Concept

    Science.gov (United States)

    Sargsyan, Ashot E.; Nicolaou, S.; Kirkpatrick, A. W.; Hamilton, D. R.; Campbell, M. R,; Billica, R. D.; Dawson, D. L.; Williams, D. R.; Dulchavsky, S. A.

    2000-01-01

    Pneumothorax is commonly seen in trauma patients; the diagnosis is usually confirmed by radiography. Use of ultrasound for this purpose, in environments such as space flight and remote terrestrial areas where radiographic capabilities are absent, is being investigated by NASA. In this study, the ability of ultrasound to assess the magnitude of pneumothorax in a porcine model was evaluated. Sonography was performed on anesthetized pigs (avg. wt. 50 kg) in both ground-based laboratory (n = 5) and micro gravity conditions (0 g) aboard the KC-135 aircraft during parabolic flight (n = 4). Aliquots of air (50-1 OOcc) were introduced into the chest through a catheter to simulate pneumothorax. Results were video-recorded and digitized for later interpretation by radiologists. Several distinct sonographic patterns of partial lung sliding were noted, including the combination of a sliding zone with a still zone, and a "segmented" sliding zone. These "partial lung sliding" patterns exclude massive pneumothorax manifested by a complete separation of the lung from the parietal pleura. In 0 g, the sonographic picture was more diverse; 1 g differences between posterior and anterior aspects were diminished. CONCLUSIONS: Modest pneumothorax can be inferred by the ultrasound sign of "partial lung sliding". This finding, which increases the negative predictive value of thoracic ultrasound, may be attributed to intermittent pleural contact, small air spaces, or alterations in pleural lubricant. Further studies of these phenomena are warranted.

  12. Magnitude of income-related disparities in adverse perinatal outcomes.

    Science.gov (United States)

    Shankardass, Ketan; O'Campo, Patricia; Dodds, Linda; Fahey, John; Joseph, Ks; Morinis, Julia; Allen, Victoria M

    2014-03-04

    To assess and compare multiple measurements of socioeconomic position (SEP) in order to determine the relationship with adverse perinatal outcomes across various contexts. A birth registry, the Nova Scotia Atlee Perinatal Database, was confidentially linked to income tax and related information for the year in which delivery occurred. Multiple logistic regression was used to examine odds ratios between multiple indicators of SEP and multiple adverse perinatal outcomes in 117734 singleton births between 1988 and 2003. Models for after tax family income were also adjusted for neighborhood deprivation to gauge the relative magnitude of effects related to SEP at both levels. Effects of SEP were stratified by single- versus multiple-parent family composition, and by urban versus rural location of residence. The risk of small for gestational age and spontaneous preterm birth was higher across all the indicators of lower SEP, while risk for large for gestational age was lower across indicators of lower SEP. Higher risk of postneonatal death was demonstrated for several measures of lower SEP. Higher material deprivation in the neighborhood of residence was associated with increased risk for perinatal death, small for gestational age birth, and iatrogenic and spontaneous preterm birth. Family composition and urbanicity were shown to modify the association between income and some perinatal outcomes. This study highlights the importance of understanding the definitions of SEP and the mechanisms that lead to the association between income and poor perinatal outcomes, and broadening the types of SEP measures used in some cases.

  13. Floods in the United States: Magnitude and frequency

    Science.gov (United States)

    Jarvis, Clarence S.; ,

    1936-01-01

    From time immemorial floods have transformed beneficent river waters into a menace to humanity. Man's progress toward economic stability has been repeatedly halted or even thrown backward by the interruption of his efforts to make effective use of rivers and of valley lands. This handicap is not imposed by the destructiveness of large rivers alone, or of rivers in widely separated areas, for there are few if any streams, brooks, or rivulets that are not subject to flows beyond their channel capacities. Yet, though man for ages has suffered seriously from recurring floods, he has not been deterred from continuing to extend his activities in areas that are virtually foredoomed to flood damage.Today in the United States serious floods may occur in any section in any year, and even, in some regions, several times a year. Many of these floods leave behind them the tragedy of death and disease and of property irreparably damaged. The aggregate direct property damage caused by floods in this country has been estimated roughly to average $35,000,000 a year. In addition there are serious indirect and intangible losses of great but not precisely calculable magnitude.

  14. The magnitude and effects of extreme solar particle events

    Directory of Open Access Journals (Sweden)

    Jiggens Piers

    2014-06-01

    Full Text Available The solar energetic particle (SEP radiation environment is an important consideration for spacecraft design, spacecraft mission planning and human spaceflight. Herein is presented an investigation into the likely severity of effects of a very large Solar Particle Event (SPE on technology and humans in space. Fluences for SPEs derived using statistical models are compared to historical SPEs to verify their appropriateness for use in the analysis which follows. By combining environment tools with tools to model effects behind varying layers of spacecraft shielding it is possible to predict what impact a large SPE would be likely to have on a spacecraft in Near-Earth interplanetary space or geostationary Earth orbit. Also presented is a comparison of results generated using the traditional method of inputting the environment spectra, determined using a statistical model, into effects tools and a new method developed as part of the ESA SEPEM Project allowing for the creation of an effect time series on which statistics, previously applied to the flux data, can be run directly. The SPE environment spectra is determined and presented as energy integrated proton fluence (cm−2 as a function of particle energy (in MeV. This is input into the SHIELDOSE-2, MULASSIS, NIEL, GRAS and SEU effects tools to provide the output results. In the case of the new method for analysis, the flux time series is fed directly into the MULASSIS and GEMAT tools integrated into the SEPEM system. The output effect quantities include total ionising dose (in rads, non-ionising energy loss (MeV g−1, single event upsets (upsets/bit and the dose in humans compared to established limits for stochastic (or cancer-causing effects and tissue reactions (such as acute radiation sickness in humans given in grey-equivalent and sieverts respectively.

  15. Landslide scaling and magnitude-frequency distribution (Invited)

    Science.gov (United States)

    Stark, C. P.; Guzzetti, F.

    2009-12-01

    Landslide-driven erosion is controlled by the scale and frequency of slope failures and by the consequent fluxes of debris off the hillslopes. Here I focus on the magnitude-frequency part of the process and develop a theory of initial slope failure and debris mobilization that reproduces the heavy-tailed distributions (PDFs) observed for landslide source areas and volumes. Landslide rupture propagation is treated as a quasi-static, non-inertial process of simplified elastoplastic deformation with strain weakening; debris runout is not considered. The model tracks the stochastically evolving imbalance of frictional, cohesive, and body forces across a failing slope, and uses safety-factor concepts to convert the evolving imbalance into a series of incremental rupture growth or arrest probabilities. A single rupture is simulated with a sequence of weighted ``coin tosses'' with weights set by the growth probabilities. Slope failure treated in this stochastic way is a survival process that generates asymptotically power-law-tail PDFs of area and volume for rock and debris slides; predicted scaling exponents are consistent with analyses of landslide inventories. The primary control on the shape of the model PDFs is the relative importance of cohesion over friction in setting slope stability: the scaling of smaller, shallower failures, and the size of the most common landslide volumes, are the result of the low cohesion of soil and regolith, whereas the negative power-law tail scaling for larger failures is tied to the greater cohesion of bedrock. The debris budget may be dominated by small or large landslides depending on the scaling of both the PDF and of the depth-length relation. I will present new model results that confirm the hypothesis that depth-length scaling is linear. Model PDF of landslide volumes.

  16. Magnitude of Anemia at Discharge Increases 30-Day Hospital Readmissions.

    Science.gov (United States)

    Koch, Colleen G; Li, Liang; Sun, Zhiyuan; Hixson, Eric D; Tang, Anne; Chagin, Kevin; Kattan, Michael; Phillips, Shannon C; Blackstone, Eugene H; Henderson, J Michael

    2017-12-01

    Anemia during hospitalization is associated with poor health outcomes. Does anemia at discharge place patients at risk for hospital readmission within 30 days of discharge? Our objectives were to examine the prevalence and magnitude of anemia at hospital discharge and determine whether anemia at discharge was associated with 30-day readmissions among a cohort of hospitalizations in a single health care system. From January 1, 2009, to August 31, 2011, there were 152,757 eligible hospitalizations within a single health care system. The endpoint was any hospitalization within 30 days of discharge. The University HealthSystem Consortium's clinical database was used for demographics and comorbidities; hemoglobin values are from the hospitals' electronic medical records, and readmission status was obtained from the University HealthSystem Consortium administrative data systems. Mild anemia was defined as hemoglobin of greater than 11 to less than 12 g/dl in women and greater than 11 to less than 13 g/dl in men; moderate, greater than 9 to less than or equal to 11 g/dl; and severe, less than or equal to 9 g/dl. Logistic regression was used to assess the association of anemia and 30-day readmissions adjusted for demographics, comorbidity, and hospitalization type. Among 152,757 hospitalizations, 72% of patients were discharged with anemia: 31,903 (21%), mild; 52,971 (35%), moderate; and 25,522 (17%), severe. Discharge anemia was associated with severity-dependent increased odds for 30-day hospital readmission compared with those without anemia: for mild anemia, 1.74 (1.65-1.82); moderate anemia, 2.76 (2.64-2.89); and severe anemia, 3.47 (3.30-3.65), P < 0.001. Anemia at discharge is associated with a severity-dependent increased risk for 30-day readmission. A strategy focusing on anemia treatment care paths during index hospitalization offers an opportunity to influence subsequent readmissions.

  17. The magnitude of syphilis: from prevalence to vertical transmission

    Directory of Open Access Journals (Sweden)

    Luciane Rodrigues Pedreira de Cerqueira

    2017-12-01

    Full Text Available ABSTRACT Introduction: In 2013, the World Health Organization (WHO reported that 1.9 million pregnant women were infected with syphilis worldwide, of which 66.5% had adverse fetal effects in cases of untreated syphilis. Congenital syphilis contributes significantly to infant mortality, accounting for 305,000 perinatal deaths worldwide annually. Aim: To estimate the prevalence of syphilis in parturients, the incidence of congenital syphilis and the vertical transmission rate. Material and methods: a cross-sectional study with data collected from 2041 parturients who had undergone treatment between 2012 and 2014 in the maternity section of the Pedro Ernesto Hospital of the State University of Rio de Janeiro, in the metropolitan area of Rio de Janeiro. The inclusion criterion was positive VDRL and treponemal test in a hospital environment. Results: the prevalence of syphilis in pregnant women was 4.1% in 2012, 3.1% in 2013 and 5% in 2014, with official reporting of 15.6%, 25.0% and 48.1%, respectively. The incidence of congenital syphilis (CS was 22/1,000 in live births (LB in 2012; 17/1,000 LB in 2013 and 44.8/1,000 LB in 2014. CS underreporting during the period was 6.7%. Vertical transmission occurred in 65.8% of infants from infected mothers. It was concluded that, in 34.6% of the CS cases, maternal VDRL titers were = 1/4. Conclusion: Results demonstrate the magnitude of the disease, fragility of the reporting system in the assessment of the actual prevalence, impact on perinatal outcomes, and they are a warning about the real situation of syphilis, which is still underestimated in the State.

  18. The magnitude of syphilis: from prevalence to vertical transmission.

    Science.gov (United States)

    Cerqueira, Luciane Rodrigues Pedreira de; Monteiro, Denise L M; Taquette, Stella R; Rodrigues, Nádia C P; Trajano, Alexandre J B; Souza, Flavio Monteiro de; Araújo, Bianca De Melo

    2017-12-21

    In 2013, the World Health Organization (WHO) reported that 1.9 million pregnant women were infected with syphilis worldwide, of which 66.5% had adverse fetal effects in cases of untreated syphilis. Congenital syphilis contributes significantly to infant mortality, accounting for 305,000 perinatal deaths worldwide annually. To estimate the prevalence of syphilis in parturients, the incidence of congenital syphilis and the vertical transmission rate. a cross-sectional study with data collected from 2041 parturients who had undergone treatment between 2012 and 2014 in the maternity section of the Pedro Ernesto Hospital of the State University of Rio de Janeiro, in the metropolitan area of Rio de Janeiro. The inclusion criterion was positive VDRL and treponemal test in a hospital environment. the prevalence of syphilis in pregnant women was 4.1% in 2012, 3.1% in 2013 and 5% in 2014, with official reporting of 15.6%, 25.0% and 48.1%, respectively. The incidence of congenital syphilis (CS) was 22/1,000 in live births (LB) in 2012; 17/1,000 LB in 2013 and 44.8/1,000 LB in 2014. CS underreporting during the period was 6.7%. Vertical transmission occurred in 65.8% of infants from infected mothers. It was concluded that, in 34.6% of the CS cases, maternal VDRL titers were = 1/4. Results demonstrate the magnitude of the disease, fragility of the reporting system in the assessment of the actual prevalence, impact on perinatal outcomes, and they are a warning about the real situation of syphilis, which is still underestimated in the State.

  19. La nueva violencia urbana de América Latina The new urban violence in Latin America

    Directory of Open Access Journals (Sweden)

    Roberto Briceño-León

    2002-12-01

    Full Text Available El artículo procura mostrar que la situación de violencia que se presenta a inicios del Siglo XXI en América Latina es un fenómeno novedoso desde el punto de vista sociológico, tanto por el crecimiento en sus magnitudes, como por lo singular de sus características. Se trata, argumenta el autor, de una violencia que no tiene orígenes o propósitos políticos, sino sociales y está vinculada al proceso de empobrecimiento que ha tenido la región a partir de los años ochenta y que ha creado unas condiciones de exclusión educativa y laboral para una gran parte de la población. Esta nueva violencia afecta fundamentalmente a los jóvenes de la segunda generación urbana quienes están expuestos a unas altas expectativas de consumo que no pueden satisfacer por los medios proscritos por la sociedad, y quienes ven en la violencia y el uso de las armas de fuego un medio para construir su identidad como hombres y lograr medios económicos para satisfacer sus aspiraciones. Este proceso de violencia delincuencial se ve acompañado de un incremento en la violencia policial, todo lo cual tiene grandes costos psicológicos y económicos para la población, costos y daños que se ven agravados por la desconfianza e ineficencia del sistema de justicia penal existente en América Latina.This article depicts the violence situation at the beginning of the 21st century in Latin America as a novel phenomenon from the sociological standpoint, both for its increase in magnitude and for its unique traits. According to the author, it is a sort of violence deprived of political origins or purposes, having only social ones, linked to the process of impoverishment in the region after the 1980s, which has created conditions of educational and work exclusion for a sizable part of the population. That new violence affects essentially the youth of the second urban generation, whose exposure to high consumption expectations cannot be met by the means prescribed by

  20. Applying coda envelope measurements to local and regional waveforms for stable estimates of magnitude, source spectra and energy

    International Nuclear Information System (INIS)

    Hofstetter, R.; Mayeda, K.; Rodgers, A.; Walter, W.

    1999-01-01

    Magnitude estimation forms an integral part in any seismic monitoring endeavor. For monitoring compliance of the Comprehensive Nuclear-Test-Ban Treaty, regional seismic discriminants are often functions of magnitude such as m(sub b):M(sub 0) high-to-low spectral ratios, and nuclear yield estimation. For small-to-moderate magnitude events that cannot be studied by a large regional or global network of stations, there is a need for stable magnitudes that can be obtained from as few as one station. To date, magnitudes based on coda envelopes are by far the most stable because of the coda's averaging properties. Unlike conventional magnitudes which utilize the direct phases such as P (P(sub n), P(sub g)) or S (S(sub n), L(sub g)), or M(sub g), a coda envelope magnitude is not as sensitive to the undesirable effects of source radiation pattern, 3-D path heterogeneity, and constructive/destructive interference near the recording site. The stability of the coda comes from a time-domain measurement made over a large portion of the seismogram thereby averaging over the scattered wavefield. This approach has been applied to earthquakes in the western United States where it was found that a single-station coda magnitude was approximately equivalent to an average over a 64 station network which used only the direct waves such as L(sub g) (Mayeda and Walter, JGR, 1996). In this paper we describe in detail our calibration procedure starting with a broadband recording, correlation with independent moment estimates, formation of narrowband envelopes, coda envelope fitting with synthetics, and finally the resultant moment-rate spectra. Our procedure accounts for all propagation, site, and S-to-coda transfer function effects. The resultant coda-derived moment-rate spectra are then used to estimate seismic moment (M(sub o)), narrowband magnitudes such as m(sub b) or M(sub L), and total seismic energy. For the eastern Mediterranean region a preliminary study was completed for

  1. Perspectivas para nuevas vacunas antituberculosas en la era posgenómica.

    Directory of Open Access Journals (Sweden)

    Luis F. García

    2004-06-01

    Full Text Available A pesar de que la vacunación con Mycobacterium bovis BCG es el procedimiento más utilizado a nivel mundial para prevenir la tuberculosis, su eficicacia es muy cuestionable, lo cual ha motivado la búsqueda de nuevas opciones inmunoprofilácticas. El conocimiento generado con el secuenciamiento completo de una cepa de Mycobacterium tuberculosis H37Rv y la aplicación de nuevas tecnologías inmunológicas, bioquímicas y genéticas han permitido realizar una disección fina del transcriptoma y el proteoma de M. tuberculosis, lo cual ha generado una gran cantidad de conocimiento sobre la biología de este microorganismo. Dado que alrededor de una tercera parte de la población mundial puede estar infectada con M. tuberculosis y que éste sólo se detecta cuando se inicia la enfermedad, la mayor parte de los esfuerzos se han dedicado al diseño de vacunas posinfección que induzcan un aumento selectivo de la inmunidad celular específica del hospedero a largo plazo, no generen reacciones adversas y sean de bajo costo. Dentro de las nuevas estrategias que están siendo utilizadas para el desarrollo de vacunas, se destaca la utilización de mezclas de proteínas con una alta inmunogenicidad, cepas de M. bovis BCG recombinantes y de M. tuberculosis genéticamente atenuadas o modificadas para inducir una mayor respuesta inmune, y las vacunas de ADN desnudo. Los candidatos con más potencial incluyen las vacunas de subunidades micobacterianas, las cuales expresan moléculas ampliamente reconocidas por el sistema inmune y cuyo reconocimiento resulta en el incremento de la respuesta Th1 y aquéllas que utilizan vectores virales diseñados para expresar moléculas micobacterianas antigénicas. Aunque los modelos animales son de valor limitado, puesto que la patología observada en ellos sólo reproduce parcialmente la observada en humanos, los resultados obtenidos con estas vacunas son muy prometedores y algunas están siendo actualmente evaluadas en

  2. La economía mundial y las nuevas tecnologías

    Directory of Open Access Journals (Sweden)

    German Guerrero Chaparro

    1991-01-01

    Full Text Available Las economías de mercado han estado utilizando la ciencia y la investigación como un factor importante de producción mediado por la tecnología. Los cambios aparecidos en la economía mundial en la década de los ochenta han originado una desarticulación de los países que usualmente suministraban materia prima (en general, países en desarrollo, y han sido dejados a sus propias posibilidades para competir en el mercado internacional con sus ventajas, las cuales no serán más en el sector primario, ni en el bajo costo de la mano de obra; lo tendrán que hacer con productos de base tecnológica. Esta nueva fase ha tenido un impacto en la reducción de la importancia del trabajo en el proceso de producción industrial, mediante la integración vertical dentro de las firmas gracias al uso de la electrónica y los computadores, logrando una gran integración del proceso de producción: comenzando con el diseño (Computer Aided Design - CAD, pasando por la manufactura integrada por computador (Computer Integrated Manufacturing -CIM, y aun hasta el almacenaje de los productos terminados. Todas estas cosas están sucediendo por el desplazamiento del trabajo. Esta nueva transformación está reemplazando la importancia de las actividades comerciales en favor de la movilidad del capital como una fuerza importante en la economía mundial. Una pregunta aparece: ¿Qué ha originado los cambios? La nueva revolución industrial los ha producido, y ha determinado cambios económicos, políticos, sociales e institucionales. Esta avalancha tecnológica ha requerido, de una parte, de nuevos profesionales del conocimiento, y de otra, de las tecnologías de punta. El presente artículo presenta, en la primera parte, los cambios ocurridos en la economía mundial desde una perspectiva tecnológica; en la segunda, describe en forma sucinta las tecnologías de avanzada, concluyendo con una novedosa especialización de los países soportada en su desarrollo inform

  3. Las nuevas tecnologías aplicadas a las clases de Computación

    Directory of Open Access Journals (Sweden)

    Alberto Santiago Gutiérrez Gutiérrez

    2009-12-01

    Full Text Available Las Nuevas Tecnologías han impactado la vida cotidiana del hombre de las postrimerías del siglo XX, que cede el paso ya, al siglo XXI, y esta irrupción tenderá a socializarse cada día más. Las escuelas, indudablemente, no serán ajenas a este fenómeno, y se moverán en el paradigma del constructivismo, en donde lo importante es aprender a aprender, y el conocimiento es saber dónde encontrar la información adecuada para la solución de problemas determinados. Entre las funciones primordiales de la educación, podemos mencionar dos: transmitir cultura, valores y experiencias a las nuevas generaciones, así como preparar a las personas, en especial a los jóvenes, para poder enfrentar el mundo que les toca vivir. En este sentido, preparar a la juventud es una labor que se torna cada vez más compleja. En la actualidad el promedio de vida es más alto, las personas no pueden terminar su formación con sólo un diploma de bachiller o aún de licenciatura. Se ha vuelto imprescindible que se continúe en el proceso de educación a lo largo de la vida. El uso de nuevas tecnologías con fines educativos, como radio, TV, telefonía, computadoras, etc., han creado amplias posibilidades de capacitación, razón por la que el rumbo de la educación debe ser reestructurado. Por todo lo anterior hemos visto la necesidad de presentar a los estudiantes facilidades en la asignatura de Computación de los contenidos que ellos reciben para que puedan realizar su trabajo independiente a través de un sitio Web donde los estudiantes tendrán acceso a él, este sitio está hecho a través de un programa de autor llamado eXe, que es una multimedia y que lo podrán localizar en uno de los servicios que presta la Facultad. Esperamos que dé resultados satisfactorios cuando se comience a aplicar, que será para el primer semestre del próximo curso 2009-2010.

  4. The relationship between local and moment magnitude in Greece during the period 2008-2016

    Science.gov (United States)

    Konstantinou, K. I.; Melis, N. S.

    2018-03-01

    We perform a systematic comparison between local and moment magnitudes in Greece for the period 2008-2016 when both magnitudes have been determined using waveform data recorded by the Hellenic Unified Seismic Network (HUSN). Differences between the two magnitudes scales on average do not exceed ± 0.2 units as has been found in other regions worldwide. A recalculation of local magnitude using magnitude residuals for each HUSN station shows that station site conditions have very little influence on the difference between local and moment magnitude. It is therefore more likely that wave propagation effects and in rare cases, anomalous source properties are dominant factors in shaping this difference. General orthogonal regression is applied to the whole dataset and also to subsets covering different areas of Greece or different time period to calibrate the one magnitude scale against the other using a linear model. The resulting relationships differ very little, suggesting that there is no significant regional/temporal variation between local and moment magnitudes. While these relationships predict that local magnitude is very close to moment magnitude if both are determined using HUSN data, the comparison with Global CMT moment magnitude (with M w in the range 4.5-6.2) shows that it is larger than local magnitude by 0.18 units. These results are particularly important for converting local magnitudes to equivalent moment magnitudes and thus homogenize the Greek earthquake catalog.

  5. The cause of larger local magnitude (Mj) in western Japan

    Science.gov (United States)

    Kawamoto, H.; Furumura, T.

    2017-12-01

    The local magnitude of the Japan Meteorological Agency (JMA) scale (Mj) in Japan sometimes show a significant discrepancy between Mw. The Mj is calculated using the amplitude of the horizontal component of ground displacement recorded by seismometers with the natural period of T0=5 s using Katsumata et al. (2004). A typical example of such a discrepancy in estimating Mj was an overestimation of the 2000 Western Tottori earthquake (Mj=7.3, Mw=6.7; hereafter referred to as event T). In this study, we examined the discrepancy between Mj and Mw for recent large earthquakes occurring in Japan.We found that the most earthquakes with larger Mj (>Mw) occur in western Japan while the earthquakes in northern Japan show reasonable Mj (=Mw). To understand the cause of such larger Mj for western Japan earthquakes we examined the strong motion record from the K-NET and KiK-net network for the event T and other earthquakes for reference. The observed ground displacement record from the event T shows a distinctive Love wave packet in tangential motion with a dominant period of about T=5 s which propagates long distances without showing strong dispersions. On the other hand, the ground motions from the earthquakes in northeastern Japan do not have such surface wave packet, and attenuation of ground motion is significant. Therefore, the overestimation of the Mj for earthquakes in western Japan may be attributed to efficient generation and propagation properties of Love wave probably relating to the crustal structure of western Japan. To explain this, we then conducted a numerical simulation of seismic wave propagation using 3D sedimentary layer model (JIVSM; Koketsu et al., 2012) and the source model of the event T. The result demonstrated the efficient generation of Love wave from the shallow strike-slip source which propagates long distances in western Japan without significant dispersions. On the other hand, the generation of surface wave was not so efficient when using a

  6. Conectando valores: las nuevas estrategias de la comunicación on-line en el tercer sector

    Directory of Open Access Journals (Sweden)

    Antonio Baraybar Fernández

    2012-04-01

    Full Text Available En su actual etapa Internet ha potenciado significativamente el carácter relacional presente desde sus inicios, convirtiéndose en una gran plataforma de conversación denominada Web Social. Las redes sociales han irrumpido en nuestra vida con un potencial comunicativo abrumador, nuevas redes que además de informar generan opinión y, en consecuencia, modifican actitudes y comportamientos. La publicidad social, por la relevante función que desempeña en la transmisión de valores, debe adaptarse al nuevo entorno y explorar las nacientes oportunidades para divulgar sus propuestas. No todo es negocio en la Web 2.0, ni mucho menos, las ONG están participando en esta nueva ágora virtual de forma creciente, en donde la relación comunicativa se vuelve más directa, más ágil, y, en consecuencia, aparecen nuevas posibilidades persuasivas que les permiten dar a conocer mejor sus actividades y recabar nuevas adhesiones.

  7. Los hombres de dios aproximación a un estudio de la masculinidad en nueva españa

    Directory of Open Access Journals (Sweden)

    Asunción Lavrin

    2004-01-01

    Full Text Available Este estudio inicia una "conversación" académica sobre la posibilidad deanalizar aspectos claves de la masculinidad dentro de tres órdenes mendicantesen Nueva España. Se adoptan tres avenidas de acercamiento al tema: 1. Elestudio de la representación del

  8. Geological map of Uruguay scale 1,100,000. Agraciada Sheet R-23, Nueva Palmira Sheet R- 24

    International Nuclear Information System (INIS)

    Ferrando, L.; Eugui, W.; Cabrera, Z.; Elias, R.

    1990-01-01

    This work is about the geological map of Uruguay Esc.1.100.000 (Agraciada and Nueva Palmira) and the explanatory memoranda which describes the geological , lithological and sedimentological soil characteristics of: Fray Bentos, Camacho, Raygon, Libertad and Villa Soriano formations

  9. ÚLTIMOS RETOS PARA EL DERECHO PRIVADO: LAS NUEVAS TECNOLOGÍAS DE LA INFORMACIÓN

    Directory of Open Access Journals (Sweden)

    Erick Rincón-Cárdenas

    2010-03-01

    Full Text Available El artículo analiza algunas de las formas en que se ve afectado el derecho privado como resultado de la incidencia de las nuevas tecnologías de la información y la comunicación en nuestra sociedad. Para ello se tendrá en cuenta la siguiente estructura metodológica: en primer lugar se desarrollará una breve introducción sobre las nuevas tecnologías de la información y la comunicación, y su incidencia en  el derecho. Seguidamente, se exponen algunos de los temas centrales de afectación del derecho privado por las nuevas tecnologías, para lo cual se utilizará el siguiente esquema: a la contratación electrónica y la nueva forma del negocio jurídico; b la propiedad en los entornos electrónicos; e la responsabilidad y los seguros en los entornos electrónicos; d los derechos del consumidor y la privacidad en los entornos electrónicos, y e la banca electrónica  y los medios de pago. Finalmente, en la tercera parte, se desarrollarán algunas conclusiones.

  10. What is cosmic radiation?

    International Nuclear Information System (INIS)

    2004-01-01

    The earth was indeed receiving ionizing radiations from the heavens. This cosmic radiation consists of particles travelling near the speed of light. It consists of two components, the first of which is permanent and of galactic origin, while the other is more sporadic, depending on the sun's activities. Natural land-based sources expose each of us to an average total dose of 2.4 mSv per year (source UNSCEAR). In addition, the human activities using ionizing radiation contribute to an average annual exposure of 1.4 mSv, originating primarily with medical activities ( radiodiagnostic and radiation therapy). Members of flights crew are subject to exposure. The total dose of cosmic radiation received is is directly proportional with the duration of exposure, and thus with the duration of the flight. Measurement taken on board aircraft during the 1990's showed that flight personnel (on long haul flights) receive an average dose of approximately the same magnitude as the one due to exposure to natural radioactivity in France. The damage caused by ionizing radiation depends on the quantity of energy released by radiation into the cells of each organ or tissue of the human body(exposure dose). For a given quantity of absorbed energy (dose expressed in Gray), the damage will vary according to the nature of the radiation and the affected organ. These effects are of two types: acute effects and deferred effects. Two measurements are essential for radiation protection: the measurements of the dose of radiation absorbed by the body and the assessment of the risk associated with the absorbed dose. Two units were thus created: the gray and the sievert. (N.C.)

  11. Dos Nuevas Técnicas Manuales Rápidas para Antibiogramas Urinarios en 6 a 18 horas

    Directory of Open Access Journals (Sweden)

    Margaret Ordóñez Smith de Danies

    1994-03-01

    Full Text Available

    Se estudiaron 694 muestras de orina de las cuales 130 sirvieron para estudiar dos nuevas técnicas manuales para antibiogramas urinarios con orinas de recuentos bacterianos >100.000 UCF/mL. Una se denomina NUEVA TECNICA DIRECTA, y se interpreta después de 6 a 18 horas de recolectada la muestra de orina, teniendo una confiabilidad del 99%. La segunda técnica se titula TECNICA DE ENRIQUECIMIENTO cuyo resultado se da entre 10 a 22 horas con una confiabilidad del 99% (p>0.900 en relación con las lecturas de la técnica estándar de difusión en disco. Con las nuevas técnicas no es necesario esperar al aislamiento bacteriano.

    Introducción
    Hasta donde llega mi conocimiento es la primera vez que se describen estas nuevas técnicas manuales para antibiogramas urinarios (se realizaron dos para escoger la mejor y obtener su informe rápido (6 a 18 horas. Al comparar las nuevas técnicas descritas con la técnica estándar de difusión en disco se ahorran de 30 a 40 horas, y el costo del cultivo para el aislamiento bacteriano. Las técnicas que propongo están al alcance económico de todo laboratorio, en especial para los países en donde no tengan equipos sistematizados, por su alto costo. Estas nuevas técnicas son totalmente manuales y además para el paciente tienen la ventaja de que le formulen pronto y a ciencia cierta el antibiótico más eficaz. Nuestras nuevas técnicas sólo se pueden aplicar para recuentos >100.000 UCF/mL, aunque hoy en día los criterios de infección urinaria no son de recuentos tan altos (1, 2, 3, 4,5...

  12. Ionizing radiation, radiation sources, radiation exposure, radiation effects. Pt. 2

    International Nuclear Information System (INIS)

    Schultz, E.

    1985-01-01

    Part 2 deals with radiation exposure due to artificial radiation sources. The article describes X-ray diagnosis complete with an analysis of major methods, nuclear-medical diagnosis, percutaneous radiation therapy, isotope therapy, radiation from industrial generation of nucler energy and other sources of ionizing radiation. In conclusion, the authors attempt to asses total dose, genetically significant dose and various hazards of total radiation exposure by means of a summation of all radiation impacts. (orig./WU) [de

  13. Atmospheric Radiation Measurement Program plan

    International Nuclear Information System (INIS)

    1990-02-01

    In order to understand energy's role in anthropogenic global climate change, significant reliance is being placed on General Circulation Models (GCMs). A major goal is to foster the development of GCMs capable of predicting the timing and magnitude of greenhouse gas-induced global warming and the regional effects of such warming. The Atmospheric Radiation Measurement (ARM) Program will contribute to the Department of Energy goal by improving the treatment of cloud radiative forcing and feedbacks in GCMs. Two issues will be addressed: the radiation budget and its spectral dependence and the radiative and other properties of clouds. The experimental objective of the ARM Program is to characterize empirically the radiative processes in the Earth's atmosphere with improved resolution and accuracy. A key to this characterization is the effective treatment of cloud formation and cloud properties in GCMs. Through this characterization of radiative properties, it will be possible to understand both the forcing and feedback effects. 19 refs., 4 figs., 2 tabs

  14. Nuevas dataciones para el Paleolítico superior de Cueva Morin (Villanueva de Villaescusa, Cantabria

    Directory of Open Access Journals (Sweden)

    José Manuel Maíllo Fernández

    2001-01-01

    Full Text Available Se presentan dos nuevas dataciones C14 realizadas en Cueva Morin de ios niveles 11 (Musteriense y 8 (Auriñaciense arcaico. También se efectúa la contextualización de éstas en el marco de la Transición entre el Paleolítico medio y el superior en la región cantábrica.We present the new C14 dates come from Cueva Morin sampies of ttie 11 (Mousterian and 8 (Archaic Aurignacian levéis. Moreover we offer the framework of this dates for the Middie-Upper Paiaeolithic Transition in the Cantabrian región.

  15. Una nueva especie de Passiflora, subgénero Passiflora (Passifloraceae del oeste de Colombia

    Directory of Open Access Journals (Sweden)

    Gerlach Gϋnter

    2000-12-01

    Full Text Available A new species of Passiflora from Colombia is here described: Passiflora chocoensis. It is closely related to P. menispermifolia, but differs by its sparsely spreading hairs, the finer texture of the leaves, its larger and cordate bracts, the number of petiolar glands and the lack of glands on the stipules and bracts.Se describe una nueva especie de Passiflora de Colombia: P. chocoensis, la cual tiene un parentesco cercano con P. menispermifolia, diferenciándose de ésta por su indumento ligero de pocos pelos dispersos, la textura de las hojas más fina, el mayor tamaño de sus brácteas en forma de corazón, la cantidad de glándulas en los pecíolos, al igual que por la ausencia de las glándulas en las brácteas y estípulas.

  16. Nueva norma de arrendamiento IFRS 16 Leases y su impacto financiero y contable

    Directory of Open Access Journals (Sweden)

    Viviana Lambreton Torres

    2017-07-01

    Full Text Available Este documento tiene como objetivo evidenciar el impacto que generará la aplicación de la IFRS 16 en las métricas de rentabilidad ROA, ROE y en el margen de utilidad. Así como en las razones de apalancamiento financiero y liquidez para que, tanto los responsables de la información como los usuarios de la misma, tengan conocimiento del efecto que genera esta nueva norma internacional de arrendamiento en la situación financiera y en los resultados de operación. Además de presentar los principales requerimientos que establece para que los tomadores de decisiones, tanto de las empresas privadas como de las públicas, puedan anticiparse y prepararse adecuadamente al cambio.

  17. Sobre una nueva inscripción latina funeraria en Lusitania

    Directory of Open Access Journals (Sweden)

    Javier Andreu Pintado

    2012-01-01

    Full Text Available El objetivo del presente trabajo es el de dar a conocer una nueva inscripción romana, funeraria, sobre granito, procedente del término municipal de Don Benito (Badajoz y seguramente adscrita al tipo de estelas graníticas tan habituales en el paisaje funerario de Augusta Emerita y su entorno. La pieza –muy fragmentaria– atestigua pese a ello la presencia de un nuevo antropónimo, Surina, hasta ahora no constatado en la epigrafía peninsular.The aim of this paper is to present a new roman inscription, a funerary one, carved on granite and founded in the municipality of Don Benito (Badajoz probably related with the usual type of granite funerary stelae commonly attested in the funerary landscape of Augusta Emerita. Instead of the very fragmentary aspect of the piece it certifies the presence of a new female name, Surina, still unattested in the hispanic epigraphy.

  18. Bordes urbanos metropolitanos en Venezuela ante nuevas leyes y proyectos inmobiliarios

    Directory of Open Access Journals (Sweden)

    Nubis Pulido

    2014-01-01

    Full Text Available En Venezuela, a los tradicionales factores motivadores de la dinámica de expansión metropolitana, hoy se incorporan nuevas decisiones de políticas emanadas como leyes desde el gobierno central. La implementación de estas leyes contribuye a acelerar la ampliación de los bordes metropolitanos, reforzando, paradójicamente, un proceso improvisado y desarticulado de anexión de nuevos desarrollos populares, sin infraestructura, equipamiento y servicios necesarios para garantizar la calidad de vida urbana, y a expensas de espacios ecológicamente valiosos y vulnerables. Estas áreas constituyen emergencias territoriales que ameritan atención particular e inmediata, porque constituyen las formas territoriales de mayores y más recientes cambios y las más susceptibles a intervenciones con fines de ordenamiento territorial.

  19. Nuevas nociones sobre el género Ficus en Colombia, III

    Directory of Open Access Journals (Sweden)

    Dugand Armando

    1944-06-01

    Full Text Available En este trabajo, continuación de mi estudio del genero Ficus en Colombia, se describe una especie nueva de este país y se proponen sendos nombres nuevos para dos especies antiguas recientemente halladas en Colombia pero originalmente descritas del Amazonas brasileño y de la América Central. Aprovecho esta oportunidad para expresar mi más vivo agradecimiento a la señorita Marjorie W. Stone, Bibliógrafa del Gray Herbarium, Universidad de Harvard, y al señor León Groizat, del Arnold Arboretum, Universidad de Harvard, por la muy diligente y valiosa ayuda que me han prestado en la búsqueda de datos bibliográficos referentes a algunas especies de Ficus de status nomenclatural incierto o dudoso.

  20. Viejas, nuevas y novísimas guerras: la conflictividad desafía la modernidad

    Directory of Open Access Journals (Sweden)

    José Manuel Pureza

    2012-02-01

    Full Text Available La comparación entre los sistemas políticos, objetivos de guerra, tipo de ejército, técnica militar y economía de guerra de las llamadas viejas guerras y de las nuevas guerras nos revela un continuum y una articulación de las causas de la violencia y de las guerras, que, a su vez, tienen manifestaciones cada vez más locales (a pesar de sus impactos globales. Y subraya también la necesidad de repensar categorías y adaptar conceptos. De hecho, los contextos de paz formal (y violenta en que emergían las viejas guerras interestatales se transformaron, después del final de la Guerra Fría, en escenarios de un nuevo tipo de conflictividad violenta, a los que se ha llamado «nuevas guerras». Sin embargo, los abordajes tradicionales sobre esas «viejas guerras» invisibilizaron las señales de emergencia de los nuevos tipos de conflictividad, ya que éstos no correspondían a ninguna definición tradicional de guerra. Las características de estas (nuevas manifestaciones de la violencia han ido desafiando las fronteras entre lo que se define como guerra y lo que se define como paz. Sin embargo, los conceptos o definiciones de conflicto y de guerra no son inmutables y estáticos, son conceptos dinámicos y deben tener capacidad de adaptación a las nuevas realidades. Nuestra propuesta es precisamente que hoy día, hay espacios de indefinición o «sin nombre», normalmente entendidos como contextos de paz formal, pero que pueden contener indicios del surgimiento de nuevísimos tipos de conflictividad, cuestionando y poniendo en duda las distinciones estanques y herméticas entre escenarios de paz formal, guerra y posguerra. Comparing the political systems, war objectives, type of army, military technique and war economics of the so-called new wars reveals a continuum and a connection of the causes for violence and wars which, in turn, present increasingly local signs (in spite of their global impact. It also stresses the need

  1. Contratación Colectiva y Flexibilidad en las Nuevas Empresas Textiles de Toluca y Lerma

    Directory of Open Access Journals (Sweden)

    Rosa Silvia Arcineaga Arce

    1999-01-01

    Full Text Available Se estudia la flexibilidad de los contratos colectivos de las empresas tex tiles más modernas de Toluca, du rante el periodo de los 90’s. Se sostiene que el proceso de profunda transformación económica y productiva, así como política, presiona por el cambio de modelo de relaciones laborales. Se concluye que el modelo no se re de fine totalmente, y como tendencia se señala un nuevo acuerdo corporativista de modernización: las nuevas empresas tex tiles se incorporan a la economía globalizada con la participación de los sindicatos.

  2. DESEMPEÑO DEL MERCADO DE VIVIENDA NUEVA EN BOGOTÁ 1992-2004

    Directory of Open Access Journals (Sweden)

    Garza Nestor

    2007-12-01

    Full Text Available Este artículo analiza las series de precios de la vivienda nueva en
    Bogotá, considerando el carácter espacial de este mercado. Para ello, se construyó una base de datos espacializada que incluye más de 17.000 registros y que permitió obtener la información sobre precios y áreas construidas, entre mayo de 1992 y abril de 2004.
    A partir de estas series se pudo establecer una estrecha relación estadística, entre el precio por metro cuadrado de las unidades de vivienda y su área construida; sin embargo, su causalidad no está claramente definida.

  3. Internacionalización e Internet: Una nueva mirada al marketing internacional

    Directory of Open Access Journals (Sweden)

    Verónica Henao Posada

    2013-06-01

    Full Text Available La economía de la información y la empresa red constituyen la base de una nueva gestión empresarial. Hoy se habla de estructuras horizontales, flexibilidad en los procesos y trabajo en equipo. Estos cambios en la economía global han influido en el desarrollo de los negocios internacionales y en la evolución del marketing internacional. Además, gracias a la Internet el mercado de masas se convierte en un mercado de nichos y las empresas tienen más oportunidades de acceder a los mercados exteriores. Finalmente, existen diversas herramientas en Internet que potencializan la internacionalización de las empresas, y la gestión de la marca, permitiendo la construcción de relaciones a largo plazo con las demás partes de la cadena de suministro.

  4. Nueva especie de rana (Atelopus de Los Farallones de Cali, Cordillera Occidental de Colombia

    Directory of Open Access Journals (Sweden)

    Kattan Gustavo

    1986-06-01

    Full Text Available Durante la realización de colecciones herpetológicas en el Departamento del Valle del Cauca, fue encontrada una especie no descrita de Atelopus (Anura: Bufonidae en los farallones de Cali, a 2600 m de altura. Esta es la primera especie en este género que se encuentra a elevaciones superiores a 2000 m en la Cordillera Occidental. Se conocen varias especies de Atelopus en las Cordilleras Central y Oriental de Colombia y en los Andes ecuatorianos (COCHRAN y GOIN 1970; PETERS 1973; RIVERO 1963 y probablemente futuras colecciones herpetológicas continuaran revelando nuevas especies en las partes altas de la Cordillera Occidental.

  5. Una nueva estructura de garantías para los bonos chilenos de infraestructura

    Directory of Open Access Journals (Sweden)

    Werner Kristjanpoller Rodríguez

    2011-12-01

    Full Text Available El sistema chileno de concesiones ha sido uno de los fundamentos del desarrollo del país y ha creado una fuerte relación entre el sector público y el sector privado para financiar grandes obras. La reciente crisis financiera destruyó la confianza en las compañías de seguros "monolínea", las cuales aseguran los bonos de infraestructura de Chile aumentando su calificación de riesgo a AAA a nivel internacional. En este contexto es necesario estudiar nuevas estructuras de garantías para estos bonos, en particular para proyectos superiores a 200 millones de dólares. Se proponen dos alternativas: una Sociedad de Garantía y garantías de contratos de concesión con cobertura privada.

  6. Movimiento podcaster: la nueva concreción de la radio libre

    Directory of Open Access Journals (Sweden)

    Francisco Godinez Galay

    2015-06-01

    Full Text Available El movimiento podcaster consiste en grupos de jóvenes que realizan sus programas de radio específicamente para el entorno digital. El aprovechamiento tecnológico se suma a las peculiaridades de la radio para asegurar su perdurabilidad bajo nuevas formas como el podcast. El podcast, por sus características, usos y necesidades encarna un eslabón más de la historia de la radio alternativa, libre e independiente, y es deudor de la cultura autogestionada y romántica del fanzine, por un lado, y del humor anecdótico del stand up y la sitcom, por el otro. Y es, a su vez, el espacio en donde se puede dar un paso superador y asegurar una relación comunicativa por sobre la concepción estrictamente informativa.

  7. Retos pendientes y nuevas situaciones en la gestión de la propiedad intelectual

    Directory of Open Access Journals (Sweden)

    Martínez Rodríguez, Emiliano

    2001-05-01

    Full Text Available No podemos decir que la propiedad intelectual no esté de moda. Nunca se habían hecho tantos informes, cursos, estudios y publicaciones; nunca fue tan frecuente acercarse a la legislación exterior o aventurarse en nuevos enfoques para nuevas situaciones. Por otra parte, esta creciente atención no viene tan sólo de los profesionales interesados, sino que se ha convertido en referencia frecuente incluso para las autoridades económicas, desde que en el comercio internacional, especialmente protagonizado por los Estados Unidos, pasó a tener un peso económico muy relevante. Todo eso está bien, constituye un indicador de que el núcleo creador y determinante de la industria cultural -la del libro, desde luego, y también las restantes- está lleno de vitalidad.

  8. The expulsion of Jesuits from Nueva Granada in 185Oas key for understanding

    Directory of Open Access Journals (Sweden)

    José David Cortés Guerrero

    2003-01-01

    Full Text Available This article shows the confrontation between the liberal ideology of the mid nineteenth century and the conservative positions of the time as a result of the expulsion of the Society of Jesus from the Nueva Granada. The expulsion of the Jesuits encapsulates several key aspects of liberal ideology: the need to break with the colonial past; progress and civilization as attainable objectives; education as a neutral in terms of religious instruction; and the separation of the Catholic Church from the State as an important factor for reaching modernization and modernity. With the expulsion of the Jesuits one can also see the aligning of the nascent political parties, some defended the expulsión, others opposed it vehemently.

  9. Las nuevas formas de la guerra y el cuerpo de las mujeres

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    Rita Laura Segato

    2014-08-01

    Full Text Available Las nuevas formas de la guerra, caracterizadas por la informalidad, se despliegan hoy en un espacio intersticial que podemos caracterizar como para-estatal porque se encuentra controlado por corporaciones armadas con participación de efectivos estatales y para estatales. En esa esfera de para-estatalidad en franca expansión, la violencia contra las mujeres ha dejado de ser un efecto colateral de la guerra y se ha transformado en un objetivo estratégico de este nuevo escenario bélico. Se examinan aquí las transformaciones históricas que circundan la informalización de la guerra y la centralidad que asume en ellas una "pedagogía de la crueldad" contra aquéllos que no juegan el papel de antagonistas armados - mujeres y niños - en los enfrentamientos.

  10. Las viejas y las nuevas formas de participación sociopolítica

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    José Guillermo Fouce

    2008-01-01

    Full Text Available En el presente artículo, se plantea esquemática y brevemente la evolución que está sufriendo el ámbito de la participación sociopolítica comparando los principales ejes considerados por el autor de la participación en el pasado con los ejes de la nueva participación o de la participación en la actualidad. Estos ejes o principios son extraídos de una amplia revisión de la literatura desarrollada en el marco de la tesis doctoral del autor y se establecen como posibles hipótesis explicativas de la evolución de la participación en nuestras sociedades contemporáneas.

  11. Orobanche montserratii A. Pujadas & D. Gómez (Orobanchaceae, especie nueva del Pirineo oscense

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    Gómez García, Daniel

    1999-12-01

    Full Text Available Orobanche montserratii A. Pujadas & D. Gómez a new species of the spanish Pyrenees is described. The diagnosis, description, original illustration and the analysis of the morphological differences between the new species and O. alsatica Kirschl., O. bartlingü Griseb, and O. mayeri (Suess. & Ronniger Bertsch & F. Bertsch, are given.Se describe una nueva especie localizada en el Pirineo español. Aportamos su diagnosis, descripción, iconografía original y el análisis de los caracteres que permiten su diferenciación de Orobanche alsatica Kirschl., O. bartlingü Griseb, y O. mayeri (Suess. & Ronniger Bertsch & F. Bertsch.

  12. Claves para entender las nuevas sensibilidades: Estudios sobre producciones culturales juveniles en Costa Rica

    Directory of Open Access Journals (Sweden)

    Priscilla Carballo Villagra

    2009-01-01

    Full Text Available En el contexto de la academia costarricense, el estudio de la población joven se ha desarrollado generalmente a partir del interés por problemas socialmente visibles, como el embarazo adolescente, las prácticas sexuales de riesgo, etc. Sin embargo, en los últimos cinco años, varias investigaciones han llamado la atención sobre otras posibles formas de entender las dinámicas juveniles urbanas. Estas investigaciones proponen analizar las vivencias jóvenes desde producciones culturales como la música, el baile, la estética, el fútbol y los espacios callejeros. Pretendemos a partir de dichas investigaciones plantear algunas claves, como las hemos denominado, para continuar con el análisis y debate de las producciones juveniles como formas de entender las nuevas sensibilidades.

  13. Errores comunes en el lenguaje periodístico. Nueva Colonización

    Directory of Open Access Journals (Sweden)

    Juan Manuel Rodríguez

    2015-01-01

    Full Text Available La vitalidad del idioma y su vigencia para expresar un mundo cambiante radica en que, al ser éste un organismo vivo, está sujeto a sufrir cambios, a traspasar o prestar palabras, en cuyo caso, se observarán las normas vigentes. Sin embargo ha de cuidarse que ésta sea absorvida por otra o contaminada fatalmente. Para el periodista, el idioma es la herramienta para informar y comunicar. Los comunicadores que enturbian, enferman y prostituyen el sentido de la expresión, se convierten en siervos, esclavos y mercenarios del nuevo colonialismo promovido por la globalización tecnológica y cultural. Los esbirros de lo moderno suelen ser propagadores y emisores gratuitos de la nueva Babel.

  14. La nueva frontera de los realities shows y de las estrategias multimedia

    Directory of Open Access Journals (Sweden)

    Mariano Cebrián Herreros

    2003-01-01

    Full Text Available El artículo aborda la situación de vanguardia de la televisión como es la generada por el programa Operación Triunfo, nacido en España y expandido a los canales de televisión de múltiples países europeos y latinoamericanos. Se analiza su presencia y penetración en los modelos generalistas, multitemáticos y convergentes de la televisión, así como la repercusión que tiene en los demás medios de comunicación: periódicos, revistas, emisoras de radio, mundo discográfico, merchandising. Se examina como un desarrollo máximo de los reality show y, sobre todo, como la nueva frontera de la estrategia multimedia a partir de un programa de televisión.

  15. Chloraea riojana (Chloraeinae-Orchidaceae), una nueva orquídea argentina

    OpenAIRE

    Sobral, Ana; Novoa, Patricio

    2013-01-01

    Se describe una nueva especie de orquídea del género Chloraea, secc. Foliosae. Encontrada en provincia de La Rioja, representa el nuevo límite sur de distribución de la sección, presente desde el sudoeste de Perú hasta el noroeste de Argentina. Las diferencias significativas, morfológicas (de color del perigonio), fenológicas y la separación geográfica con las otras especies del género justifican la creación de este nuevo taxón. La diferencia más evidente con las especies afines (Chloraea pra...

  16. Nueva especie de zapote de monte (Phragmotheca, Bombacacea en bosques premontanos del centro de Colombia

    Directory of Open Access Journals (Sweden)

    Fernández Alonso José Luis

    1999-11-01

    Full Text Available A new species of Phragmotheca (Bombacaceae is described and illustrated. This represents the first record of this genus in premontane forest (subandean belt and is also the first locality for Phragmotheca in the Eastern Cordillera of Colombia. The genus was previously known only from the Chocó biogeographic region and the Amazonian lowlands.Se describe e ilustra una nueva especie de Phragmotheca (Bombacaceae, que representa el primer registro del género en bosques premontanos (franja subandina y en la Cordillera Oriental de Colombia. Phragmotheca era conocido hasta ahora, sólo de la región biogeográfica chocoana y de la planicie amazónica.

  17. Mujeres en Yucatán: Nuevas figuras obreras a partir del modelo maquilador extranjero

    Directory of Open Access Journals (Sweden)

    Castilla R., Beatriz

    2000-12-01

    Full Text Available The author describes the export maquiladora industry in Yucatán, México, and calis attention to the emergence of a new type of women workers whose job records have tumed them into new social actors in this socioeconomic process. The subject discussed falls within the study of globalization and the heterogeneity it causes in specific social areas.El presente artículo ofrece una visión panorámica de la industria maquiladora de exportación en Yucatán, México, poniendo el acento en el surgimiento de nuevas figuras obreras que resultan ser, en esencia, mujeres cuyas trayectorias laborales las han convertido en nuevos actores de estos procesos socioeconómicos. El tema se inscribe en el campo de los estudios sobre la mundialización y la heterogeneidad que ésta conlleva en socioterritorios específicos.

  18. Nuevas exigencias, retos, tendencias… ¿cambios en la evaluación de aprendizajes universitarios?

    OpenAIRE

    Porto Currás, Mónica; García Hernández, María Luisa

    2012-01-01

    Nos hemos acostumbrado a leer y escuchar que la Universidad se encuentra inmersa en un proceso de renovación, de modernización, de adaptación a las nuevas exigencias de la sociedad –¿del mercado?-, lo cual conlleva una modificación en la organización y estructura de los estudios universitarios y, sobre todo, una revisión crítica y reformulación de la formación pretendida, así como de la metodología de enseñanza y evaluación necesarias para conseguir estos nuevos fines. Mientras que difere...

  19. La nueva cultura de la discapacidad y los modelos de rehabilitación

    Directory of Open Access Journals (Sweden)

    Gloria Maritza Céspedes

    2005-01-01

    Full Text Available El presente artículo tiene como propósito principal dar a conocer los planteamientos teóricos sobre la nueva concepción de la discapacidad orientada desde el reconocimiento de los derechos humanos, la autonomía, la integración, las capacidades y los apoyos, enfatizando en la interacción de la persona con discapacidad y el ambiente donde vive. Por otra parte, se describen algunos de los modelos de rehabilitaci ón que han sido utilizados a lo largo del tiempo, pero que han resultado ineficaces hacia la atención integral de la persona con discapacidad. Por esto, finalmente se plantea el modelo ecológico como una alternativa que aborda de manera integral los diferentes aspectos de la vida de cada persona.

  20. Educación, nuevas tecnologías y globalización

    Directory of Open Access Journals (Sweden)

    Rafael Feito

    2002-06-01

    Full Text Available Estamos asistiendo a una transformación económica y social similar a la que supuso la revolución neolítica o la revolución industrial. El acceso a la denominada sociedad del conocimiento exige profundas transformaciones a la escuela, la cual debe ser capaz de suministrar una educación obligatoria de calidad a todos los niños y niñas. Los riesgos de exclusión social son cada vez mayores para quienes quedan al margen de las nuevas tecnologías, de cuyo uso y enseñanza han de ocuparse con intensidad las escuelas.

  1. Radiation effects and radioprotectors

    Energy Technology Data Exchange (ETDEWEB)

    Purohit, R.K., E-mail: dr_rajendra_purohit@yahoo.co.in [Radiation Biology Laboratory, Department of Zoology, Govt. Dungar College, Bikaner (India); Bugalia, Saroj [Department of Zoology, S.K. Kalyan College, Sikar (India); Dakshene, Monika [Department of Chemistry, Govt. College, Kota (India)

    2012-07-01

    Radiation exposure causes damage to biological systems and these damages are mediated by the generation of free radicals and reactive oxygen species targeting vital cellular components such as DNA and membranes. DNA repair systems and the endogenous cellular biochemical defense mechanisms against reactive oxygen species and antioxidants enzymes like reduced Glutathione (GSH), Superoxide dismutase, Glutathione peroxidase catalase etc. fail upon exposures to higher as well as chronic radiation doses leading to alterations in cell functions, cell death or mutations. Radioprotectors prevent these alterations and protect cells and tissues from the deleterious effects of radiations. Radioprotectors are of great importance due to their possible and potential application during planned radiation exposures such as radiotherapy, diagnostic scanning, clean up operations in nuclear accidents, space expeditions etc. and Unplanned radiations exposures such as accidents in nuclear industry, nuclear terrorism, natural background radiation etc. Many of the available synthetic radioprotectors are toxic to mammalian system at doses required to be effective as radioprotector. Increasing uses of ionizing radiation have drawn the attention of many radiobiologists towards their undesired side effects produced in various tissues and for modifying them to facilitate the beneficial uses of radiation. Modification of radiation response is obtained by means of chemical substances that can significantly decrease the magnitude of response when present in a biological system during irradiation. Radioprotectors are chemicals that modify a cell's response to radiation. Radioprotectors are drugs that protect normal (non cancerous) cells from the damage caused by radiation therapy. These agents promote the repair of normal cells that are exposed to radiation. Various chemicals, like Cysteamine, MPG , WR-2721 have been tested for the protection against harmful effects of radiation. These radio

  2. Radiation effects and radioprotectors

    International Nuclear Information System (INIS)

    Purohit, R.K.; Bugalia, Saroj; Dakshene, Monika

    2012-01-01

    Radiation exposure causes damage to biological systems and these damages are mediated by the generation of free radicals and reactive oxygen species targeting vital cellular components such as DNA and membranes. DNA repair systems and the endogenous cellular biochemical defense mechanisms against reactive oxygen species and antioxidants enzymes like reduced Glutathione (GSH), Superoxide dismutase, Glutathione peroxidase catalase etc. fail upon exposures to higher as well as chronic radiation doses leading to alterations in cell functions, cell death or mutations. Radioprotectors prevent these alterations and protect cells and tissues from the deleterious effects of radiations. Radioprotectors are of great importance due to their possible and potential application during planned radiation exposures such as radiotherapy, diagnostic scanning, clean up operations in nuclear accidents, space expeditions etc. and Unplanned radiations exposures such as accidents in nuclear industry, nuclear terrorism, natural background radiation etc. Many of the available synthetic radioprotectors are toxic to mammalian system at doses required to be effective as radioprotector. Increasing uses of ionizing radiation have drawn the attention of many radiobiologists towards their undesired side effects produced in various tissues and for modifying them to facilitate the beneficial uses of radiation. Modification of radiation response is obtained by means of chemical substances that can significantly decrease the magnitude of response when present in a biological system during irradiation. Radioprotectors are chemicals that modify a cell's response to radiation. Radioprotectors are drugs that protect normal (non cancerous) cells from the damage caused by radiation therapy. These agents promote the repair of normal cells that are exposed to radiation. Various chemicals, like Cysteamine, MPG , WR-2721 have been tested for the protection against harmful effects of radiation. These radio

  3. Santa Teresa en los conventos de monjas de Nueva España

    Directory of Open Access Journals (Sweden)

    Lavrin, Asuncion

    2015-12-01

    Full Text Available The transfer of the spiritual message of Saint Teresa to the viceregal court of New Spain tested the ability of Teresa’s teachings to adapt to new societies within the Spanish empire. Although the Carmelites founded only seven convents in Mexico, the Order succeeded in following the key precepts of the Teresian charisma, although nuanced by a baroque style of observance that insisted on spiritual and corporal mortification, complete humility and obedience, visionary experiences, and the imitation of Christ to achieve God’s love. Despite their small numbers, Carmelite nuns earned the respect of colonial society for their dedication to an ascetic way of life, personal poverty and the centrality of prayer.El trasplante de la espiritualidad teresiana a Nueva España fue una experiencia que puso a prueba la capacidad de adaptar su mensaje reformista a las circunstancias de nuevas sociedades en formación en el imperio español. Con sólo siete conventos femeninos en el nuevo virreinato, la Orden logró seguir los preceptos esenciales de Santa Teresa aunque matizados por una religiosidad barroca que insistía en mortificaciones espirituales y corporales, completa humildad y obediencia, experiencias visionarias, e imitatio Christi para acceder al amor de Dios. A pesar de su corto número las Carmelitas ganaron el respeto de la sociedad colonial por su dedicación a la vida ascética, la pobreza personal y la centralidad de la práctica de la oración.

  4. LA LITERATURA SOBRE LAS NUEVAS RELIGIOSIDADES EN LAS CLASES MEDIAS URBANAS. UNA MIRADA DESDE ARGENTINA

    Directory of Open Access Journals (Sweden)

    Nicolás Viotti

    2011-06-01

    Full Text Available Este trabajo se propone hacer un recorrido por la literatura sobre las nuevas religiosidades en elámbito urbano de los sectores medios argentinos que encarnan idealmente el catolicismo de tipocarismático y la llamada Nueva Era. Esta indagación detalla dos movimientos de análisis sobrecómo religiosidad y clase media se vinculan. En primer lugar describe los trabajos que, centradosen prácticas y experiencias religiosas específicas, remiten a la clase media como una característicagenérica de los participantes. Entre ellos reconoce una corriente de análisis que extiende lapreocupación de la religiosidad en el horizonte más amplio de una cultura de clase específica quetiene como valores centrales la noción de individuo y la autonomía. En segundo lugar se concentraen cómo los trabajos preocupados inicialmente con la movilidad social de la clase media enrelación a sus nuevos y viejos valores, analizan tangencialmente algunos fenómenos novedosos enlo que hace a las prácticas religiosas de esa población. El trabajo concluye que es necesaria unarelectura comparada entre religiosidad y clase media atendiendo tanto a valores específicos ycontrastivos de esos colectivos como a los procesos en que la religiosidad funciona como vehículode diferenciación y construcción de identidades de clase.

  5. IACuba 37: Nueva variedad de arroz, para las condiciones de riego.

    Directory of Open Access Journals (Sweden)

    René Pérez Polanco

    2014-12-01

    Full Text Available La variedad IACuba-37 fue obtenida a partir del cruzamiento, IACuba-16//J104/2064; después de obtenida la población producto de dicho cruzamiento, fue conducida por el método masal modificado hasta llevarla a la homocigosis, se obtuvo entre varias línea, la 4544, la que fue estudiada en los ensayos de rendimiento de todo el País y por sus resultados, resultó aprobada como nueva variedad de arroz para las condiciones de riego por el Instituto de Investigaciones de Granos de Cuba. La nueva variedad en condiciones de investigación produce rendimiento agrícola medio de 8.4 y 5.5 t/ha en frío y primavera respectivamente, en condiciones de producción tuvo rendimiento de 8.9 t/ha; además el ciclo de germinación a cosecha está en el rango de 112- 137 días, posee granos cristalinos, los que se parten poco en el molino, produce el 59.97 % de granos enteros, es resistente a Tagosodes orizicolus y presenta resistencia intermedia a la Pyricularia grisea; esta variedad contribuirá al incremento de la producción en este cereal; por su resistencia a las plagas, permite disminuir el uso de plaguicidas y por ende existirá una menor contaminación ambiental, además ayudará a fortalecer la estructura varietal en el cultivo del arroz.

  6. Nueva regulación del IVA en el comercio electrónico

    Directory of Open Access Journals (Sweden)

    Ana Maria Delgado

    2015-06-01

    Full Text Available

    La Ley 28/2014, de 27 de noviembre, por la que se modifica la Ley 37/1992, de 28 de diciembre, del impuesto sobre el valor añadido, introduce nuevas reglas de localización de los servicios de telecomunicaciones, de radiodifusión y televisión y de las prestaciones de servicios efectuadas por vía electrónica. A partir del 1 de enero de 2015, de acuerdo con las reglas de localización introducidas en la Directiva 2006/112/CE por la Directiva 2008/8/CE, de 12 de febrero de 2008, cuando estos servicios se presten a un consumidor final, pasan a gravarse en el lugar donde el destinatario esté establecido, tenga su domicilio o residencia habitual, independientemente del lugar donde esté establecido el prestador.

    Estas nuevas reglas de localización en el IVA vienen acompañadas de dos nuevos regímenes especiales del IVA, que son opcionales y que permiten a los sujetos pasivos liquidar el impuesto adeudado por la prestación de dichos servicios a través de un portal web «ventanilla única» en el estado miembro de la UE en que estén identificados, lo cual les evita tener que registrarse en cada estado miembro donde realicen las operaciones.

    Asimismo, debe tenerse en cuenta la normativa comunitaria que desarrolla la Directiva del IVA en este aspecto y que resulta directamente aplicable en cada uno de los Estados miembros: el Reglamento de Ejecución (UE 1042/2013, del Consejo, de 7 de octubre de 2013, y el Reglamento de Ejecución (UE 967/2012, del Consejo, de 9 de octubre de 2012.

  7. El médico auditor: Nueva especialidad y práctica profesional

    Directory of Open Access Journals (Sweden)

    Facultad de Medicina Revista

    1997-07-01

    Full Text Available Con la puesta en marcha de la ley 100 Y su implementación mediante decretos reglamentarios, ha irrumpido en la práctica médica una nueva modalidad de ejercicio médico. No se sorprenda de encontrar hurgando en sus historias clínicas a nuevas profesionales de la salud, quienes estarán investigando, diferentes pormenores sobre los casos clínicos manejados por Ud., con la acuciosidad, que envidiaría hasta un Sherlock Holmes, estarán tratando de encontrar justificación a sus decisiones científicas en términos de la pertinencia o no, de sus diagnósticos y exámenes paraclínicos, esquemas de tratamiento, si aplica normas institucionales de manejo clínico; adicionalmente, cruzaran sus datos de evolución y formulación, con los registros de enfermería. La revisaran las facturas de cobros y determinaran, si estas se ajustan a las decisiones médicas y observaran, si los costes son racionales o por el contrario, desbordados. Solicitarán algunos informes clínicos para respaldar decisiones especializadas o de alto costo, pero no se preocupe, jamás entraran en choque o exigencias con Ud., ni interferirán sus decisiones o sus esquemas de manejo. Finalmente, harán un informe a su respectiva EPS, o si encontraron irregularidades, dialogaran o informaran al director de la respectiva IPS.

  8. Aproximación al desarrollo rural desde la nueva ruralidad

    Directory of Open Access Journals (Sweden)

    Luz Adriana Pita-Morales

    2015-01-01

    Full Text Available El desarrollo rural ha sido objeto de distintas aproximaciones conceptuales, en función del momento socioeconómico espacial imperante; se destacan el estructuralismo y la modernización, que tuvieron influencia desde la década de los cincuenta hasta mediados de la de los sesenta; la dependencia, desde mediados de los años sesenta y hasta el final de los setenta; el neoliberalismo, desde los ochenta; el neoestructuralismo y las estrategias de vida rural, a partir de los noventa (1, y el enfoque territorial (2. La nueva ruralidad, que puede ubicarse en el enfoque de estrategias de vida, ha tenido un amplio desarrollo y estudio en América Latina; con esta orientación se intenta entender la complejidad y la dinámica del espacio rural, que trasciende su tradicional concepción de sector productor y abastecedor de alimentos; dentro de este marco es pertinente su estudio, si se tiene en cuenta que el contexto rural es precisamente el nicho de trabajo de los profesionales del sector agrario. Con esta revisión se pretende contribuir a la construcción del concepto de nueva ruralidad, como herramienta para el análisis del sector rural, a través de la compilación y análisis de los aportes de diferentes autores. Los resultados indican que este enfoque se corresponde con la adaptación de la población rural a fenómenos económicos, sociales y culturales, reconociendo que la multidimensionalidad del espacio rural es una aproximación pertinente que permite comprender e intervenir en los problemas del desarrollo rural.

  9. The Influence of Emission Location on the Magnitude and Spatial Distribution of Aerosols' Climate Effects

    Science.gov (United States)

    Persad, G.; Caldeira, K.

    2017-12-01

    The global distribution of anthropogenic aerosol emissions has evolved continuously since the preindustrial era - from 20th century North American and Western European emissions hotspots to present-day South and East Asian ones. With this comes a relocation of the regional radiative, dynamical, and hydrological impacts of aerosol emissions, which may influence global climate differently depending on where they occur. A lack of understanding of this relationship between aerosol emissions' location and their global climate effects, however, obscures the potential influence that aerosols' evolving geographic distribution may have on global and regional climate change—a gap which we address in this work. Using a novel suite of experiments in the CESM CAM5 atmospheric general circulation model coupled to a slab ocean, we systematically test and analyze mechanisms behind the relative climate impact of identical black carbon and sulfate aerosol emissions located in each of 8 past, present, or projected future major emissions regions. Results indicate that historically high emissions regions, such as North America and Western Europe, produce a stronger cooling effect than current and projected future high emissions regions. Aerosol emissions located in Western Europe produce 3 times the global mean cooling (-0.34 °C) as those located in East Africa or India (-0.11 °C). The aerosols' in-situ radiative effects remain relatively confined near the emissions region, but large distal cooling results from remote feedback processes - such as ice albedo and cloud changes - that are excited more strongly by emissions from certain regions than others. Results suggest that aerosol emissions from different countries should not be considered equal in the context of climate mitigation accounting, and that the evolving geographic distribution of aerosol emissions may have a substantial impact on the magnitude and spatial distribution of global climate change.

  10. New Directive on Occupational Protection against Electromagnetic Fields; Nueva Directiva de Protección Ocupacional ante Campos Electromagnéticos

    Energy Technology Data Exchange (ETDEWEB)

    Berlana Llorente, T.; Úbeda Maeso, A.

    2015-07-01

    :Concerns on the potential impact that the application of Directive 2004/40/EC would have on the activities of some industrial and technological sectors, have led to the repeal of that Directive and its replacement by the more permissive Directive 2013/35/EU. This new regulation on the minimum health and safety requirements regarding the exposure of workers to risks arising from physical agents (electromagnetic fields) is based on the modifications that the International Commission on Non-Ionizing Radiation Protection (ICNIRP) recently made on its original guidelines. [Spanish] Las preocupaciones manifestadas por ciertos sectores tecnológicos e industriales sobre el impacto que la aplicación de los criterios de la Directiva 2004/40/CE tendría en sus actividades, han motivado la derogación de tal Directiva y su sustitución por otra más permisiva, la Directiva 2013/35/UE. Esta nueva regulación sobre las disposiciones mínimas de salud y seguridad relativas a la exposición de los trabajadores a los riesgos derivados de agentes físicos (campos electromagnéticos) se basa en las modificaciones que la Comisión Internacional sobre Protección frente a Radiaciones No Ionizantes (ICNIRP) ha introducido recientemente en sus directrices originales, que sirvieron de base a la Directiva ahora derogada.

  11. Atoms, radiation, and radiation protection

    International Nuclear Information System (INIS)

    Turner, J.E.

    1986-01-01

    This book describes basic atomic and nuclear structure, the physical processes that result in the emission of ionizing radiations, and external and internal radiation protection criteria, standards, and practices from the standpoint of their underlying physical and biological basis. The sources and properties of ionizing radiation-charged particles, photons, and neutrons-and their interactions with matter are discussed in detail. The underlying physical principles of radiation detection and systems for radiation dosimetry are presented. Topics considered include atomic physics and radiation; atomic structure and radiation; the nucleus and nuclear radiation; interaction of heavy charged particles with matter; interaction of beta particles with matter; phenomena associated with charged-particle tracks; interaction of photons with matter; neutrons, fission and criticality; methods of radiation detection; radiation dosimetry; chemical and biological effects of radiation; radiation protection criteria and standards; external radiation protection; and internal dosimetry and radiation protection

  12. Natural radiation

    International Nuclear Information System (INIS)

    Feliciano, Vanusa Maria Delage

    2016-01-01

    Cosmic radiation, as well as cosmogenic radiation, terrestrial radiation, radon and thorium are introduced in this chapter 3. The distribution of natural radiation sources is treated, where the percentage distribution of the contribution relative to exposure to radiation from natural and artificial sources is also included

  13. Uses of synchrotron radiation

    International Nuclear Information System (INIS)

    Gordon, B.M.

    1982-01-01

    X-ray fluorescence has long been used as a technique for elemental analysis. X-ray fluorescence techniques have a number of features that make them attractive for application to biomedical samples. In the past few years synchrotron radiation x-ray sources have been developed and, because of their properties, their use can improve the sensitivity for trace element analysis by two to three orders of magnitude. Also, synchrotron radiation will make possible an x-ray microprobe with resolution in the micrometer range. The National Synchrotron Light Source (NSLS), a dedicated synchrotron radiation source recently built at Brookhaven National Laboratory, will have a facility for trace element analysis by x-ray fluorescence and will be available to all interested users

  14. Stimulated coherent transition radiation

    International Nuclear Information System (INIS)

    Hung-chi Lihn.

    1996-03-01

    Coherent radiation emitted from a relativistic electron bunch consists of wavelengths longer than or comparable to the bunch length. The intensity of this radiation out-numbers that of its incoherent counterpart, which extends to wavelengths shorter than the bunch length, by a factor equal to the number of electrons in the bunch. In typical accelerators, this factor is about 8 to 11 orders of magnitude. The spectrum of the coherent radiation is determined by the Fourier transform of the electron bunch distribution and, therefore, contains information of the bunch distribution. Coherent transition radiation emitted from subpicosecond electron bunches at the Stanford SUNSHINE facility is observed in the far-infrared regime through a room-temperature pyroelectric bolometer and characterized through the electron bunch-length study. To measure the bunch length, a new frequency-resolved subpicosecond bunch-length measuring system is developed. This system uses a far-infrared Michelson interferometer to measure the spectrum of coherent transition radiation through optical autocorrelation with resolution far better than existing time-resolved methods. Hence, the radiation spectrum and the bunch length are deduced from the autocorrelation measurement. To study the stimulation of coherent transition radiation, a special cavity named BRAICER is invented. Far-infrared light pulses of coherent transition radiation emitted from electron bunches are delayed and circulated in the cavity to coincide with subsequent incoming electron bunches. This coincidence of light pulses with electron bunches enables the light to do work on electrons, and thus stimulates more radiated energy. The possibilities of extending the bunch-length measuring system to measure the three-dimensional bunch distribution and making the BRAICER cavity a broadband, high-intensity, coherent, far-infrared light source are also discussed

  15. Empirical Global Relations Converting M S and m b to Moment Magnitude

    Science.gov (United States)

    Scordilis, E. M.

    2006-04-01

    The existence of several magnitude scales used by seismological centers all over the world and the compilation of earthquake catalogs by many authors have rendered globally valid relations connecting magnitude scales a necessity. This would allow the creation of a homogeneous global earthquake catalog, a useful tool for earthquake research. Of special interest is the definition of global relations converting different magnitude scales to the most reliable and useful scale of magnitude, the moment magnitude, M W. In order to accomplish this, a very large sample of data from international seismological sources (ISC, NEIC, HRVD, etc.) has been collected and processed. The magnitude scales tested against M W are the surface wave magnitude, M S, the body wave magnitude, m b, and the local magnitude, M L. The moment magnitudes adopted have been taken from the CMT solutions of HRVD and USGS. The data set used in this study contains 20,407 earthquakes, which occurred all over the world during the time period 1.1.1976-31.5.2003, for which moment magnitudes are available. It is shown that well-defined relations hold between M W and m b and M S and that these relations can be reliably used for compiling homogeneous, with respect to magnitude, earthquake catalogs.

  16. The Effects of Numerical Magnitude, Size, and Color Saturation on Perceived Interval Duration

    Science.gov (United States)

    Alards-Tomalin, Doug; Leboe-McGowan, Jason P.; Shaw, Joshua D. M.; Leboe-McGowan, Launa C.

    2014-01-01

    The relative magnitude (or intensity) of an event can have direct implications on timing estimation. Previous studies have found that greater magnitude stimuli are often reported as longer in duration than lesser magnitudes, including Arabic digits (Xuan, Zhang, He, & Chen, 2007). One explanation for these findings is that different…

  17. Radiation enteritis

    International Nuclear Information System (INIS)

    Ochsner, S.F.; Head, L.H.

    1973-01-01

    A comprehensive review of radiation enteritis is presented. Experience in clinical radiation therapy has indicated that the small bowel is the segment of the alimentary tract that is most susceptible to radiation damage. (U.S.)

  18. Radiation monitor

    International Nuclear Information System (INIS)

    Pao, C.T.; Green, W.K.

    1978-01-01

    A system for indicating radiation from a radioactive fluid such as a gas wherein simultaneous indications of the activity concentration of radioactivity of the gas, the radiation dose rate and average energy of the radiation are provided

  19. Radiation protection

    International Nuclear Information System (INIS)

    Ures Pantazi, M.

    1994-01-01

    This work define procedures and controls about ionizing radiations. Between some definitions it found the following topics: radiation dose, risk, biological effects, international radioprotection bodies, workers exposure, accidental exposure, emergencies and radiation protection

  20. Radiation sickness

    Science.gov (United States)

    ... exposure to ionizing radiation. There are two main types of radiation: nonionizing and ionizing. Nonionizing radiation comes in the form of light, radio waves, microwaves and radar. These forms usually don't cause tissue damage. ...

  1. Ionizing radiation

    International Nuclear Information System (INIS)

    Kruger, J.

    1989-01-01

    Ionizing radiation results in biological damage that differs from other hazardous substances and is highly dangerous to man. Ionizing radiation cannot be perceived by man's sense organs and the biological damage cannot be detected immediately afterwards (except in very high doses). Every human being is exposed to low doses of radiation. The structure of the atom; sources of ionizing radiation; radiation units; biological effects; norms for radiation protection; and the national control in South Africa are discussed. 1 fig., 5 refs

  2. Fourier Magnitude-Based Privacy-Preserving Clustering on Time-Series Data

    Science.gov (United States)

    Kim, Hea-Suk; Moon, Yang-Sae

    Privacy-preserving clustering (PPC in short) is important in publishing sensitive time-series data. Previous PPC solutions, however, have a problem of not preserving distance orders or incurring privacy breach. To solve this problem, we propose a new PPC approach that exploits Fourier magnitudes of time-series. Our magnitude-based method does not cause privacy breach even though its techniques or related parameters are publicly revealed. Using magnitudes only, however, incurs the distance order problem, and we thus present magnitude selection strategies to preserve as many Euclidean distance orders as possible. Through extensive experiments, we showcase the superiority of our magnitude-based approach.

  3. Radiation induced sarcomas of bone following therapeutic radiation

    International Nuclear Information System (INIS)

    Kim, J.H.; Chu, F.C.H.; Woodward, H.Q.; Huvos, A.

    1983-01-01

    Because of new therapeutic trends of multi-modality and the importance of late effects, we have updated our series of radiation induced bone sarcomas seen at Memorial Sloan-Kettering Cancer Center over the past four decades. A total of 37 cases of bone sarcoma arising from normal bone in the irradiated field was analyzed. The median for latent period from irradiation to diagnosis of bone sarcoma was 11 years with a minimum latent period of four years. The median radiation dose for the bone sarcoma was 6000 rad in 6 weeks with a minimum total radiation dose of 3000 rad in 3 weeks. We have found nine patients who developed bone sarcomas in the radiation field after successful treatment of Hodgkin's disease. Criteria for radiation induced bone sarcomas and the magnitude of the risk of bone sarcomas are briefly discussed

  4. Radiation exposures: risks and realities

    International Nuclear Information System (INIS)

    Ganesh, G.

    2010-01-01

    Discovery of radioactivity in 1869 by Henry Becquerel and artificial radioactivity by Irene Curie in 1934 led to the development of nuclear field and nuclear materials in 20th century. They are widely used for man-kind across the globe in electricity production, carbon dating, treatment and diagnosis of diseases etc. While deriving benefits and utilizing nuclear resources for the benefit of man-kind, it is inevitable that exposure to radiation can not be avoided. Radiation exists all around us either natural or man-made which can not be totally eliminated or avoided. Radiation exposures from natural background contribute 2.4 to 3.6 mSv in a year. Radiation exposures incurred by a member of public due to nuclear industries constitute less than one hundredth of annual dose due to natural background. Hence it is important to understand the risk posed by radiation and comparison of radiation risk with various risks arising due to other sources. Studies have indicated that risks due to environmental pollution, cigarette smoking, alcohol consumption, heart diseases are far higher in magnitude compared to radiation risks from man made sources. This paper brings about the details and awareness regarding radiation exposures, radiation risk, various risks associated with other industries and benefits of radiation exposures. (author)

  5. Aguas residuales y contaminación del lago de Amatitlán: Villa Canales y Villa Nueva (2005-2014

    Directory of Open Access Journals (Sweden)

    Luis F. Olayo

    2017-03-01

    Full Text Available La contaminación y destrucción del lago de Amatitlán es un problema ambiental actual y de gran magnitud en el Área Metropolitana de la Ciudad de Guatemala, un fenómeno antrópico que crece aceleradamente, derivado del crecimiento demográfico y urbano que experimentan los lugares poblados de los 14 municipios que se localizan en la cuenca del lago de Amatitlán. La vivienda urbana -que se cuantifica por miles- es una de las fuentes productoras de las aguas residuales domiciliares que se depositan en el citado lago desde el traslado y asentamiento de la ciudad de Guatemala de la Asunción al Valle de la Ermita en el año de 1776 hasta el año 2016 (240 años, las que nunca han recibido un tratamiento apropiado; esta tendencia hará que en el corto plazo, el lago se pierda, convirtiéndose en un pantano insalubre que hará inhabitables sus tierras adyacentes. Mediante estimaciones de población urbana municipal y datos recientes de la cantidad de viviendas construidas en las áreas urbanas de los municipios de Villa Canales y Villa Nueva en el período 2005-2014, se estimó la producción de aguas residuales domiciliares (caudales o volúmenes, útiles para ilustrar y dimensionar este problema, débilmente visibilizado, considerado y valorado por la población, la iniciativa privada e instituciones del estado -municipalidades, instituciones y ministerios-, involucradas en este problema.

  6. Radiation carcinogenesis

    International Nuclear Information System (INIS)

    1978-01-01

    The Cancergram deals with all aspects of radiation carcinogenesis. The term radiation here includes U-V radiation and the entire electromagnetic spectrum, electron and other charged particle beams, neutrons, and alpha and beta radiation from radioactive substances. Abstracts included concern relationships between radiation and carcinogenesis in humans, experimental induction of tumors in animals by irradiation, studies on the mechanism of radiation carcinogenesis at the cellular level, studies of RBE, dose response or dose threshold in relation to radiation carcinogenesis, and methods and policies for control of radiation exposure in the general population. In general, this Cancergram excludes abstracts on radio-therapy, radiologic diagnosis, radiation pathology, and radiation biology, where these articles have no bearing on radiation carcinogenesis

  7. Un nuevo orden mundial, una ética universal, una nueva educación

    Directory of Open Access Journals (Sweden)

    Amparo MARTÍNEZ SÁNCHEZ

    2009-11-01

    Full Text Available RESUMEN: Este artículo ofrece unas reflexiones sobre la urgencia de establecer un nuevo orden mundial que exige: «una ética universal», «una nueva educación», «un mundo en paz». Se subraya que es necesaria una educación que esté al servicio: del desarrollo económico de los pueblos, particularmente de los pueblos del Sur; de la justicia cultural global y del diálogo de civilizaciones; de la democratización de todas las sociedades. Una educación que tenga como base un humanismo de carácter universal. Se concluye apuntando que la tarea social más urgente consiste en activar una nueva conciencia y unos nuevos actores sociales que fortalezcan los vínculos humanos en el nuevo escenario de la mundialización.ABSTRACT: This article offers some reflections on the urgency of establishing a new world order that calls for: «a universal ethic», «a new education», «a peaceful world». It emphasises the importance of education that serves: economic development of communities, particularly those in the South; global cultural justice and dialogue between civilisations; démocratisation of all societies. Education based on universal humanity. The conclusion demonstrates that the most urgent social task is to activate a new social conscience, and new social actors to strengthen human bonds in the current scenario of globalisation.RÉSUMÉ: Cet article offre une réflexion sur l'urgence d'établir un nouvel ordre mondial exigeant: une éthique universelle, une nouvelle éducation, un monde en paix. L'article met en évidence la nécessité d'une éducation au service du développement économique des peuples, en particulier des peuples du Sud; de la justice culturelle globale et du dialogue entre civilisations; de la démocratisation de toutes les sociétés. Une nouvelle éducation ayant comme base un humanisme universel. La conclusion démontre que la tâche sociale la plus urgente est celle d'activer une nouvelle conscience et des nouveaux

  8. Reto Europeo: la Eficiencia Energetica en Edificios. La Nueva Directiva Comunitaria 31/2010

    Directory of Open Access Journals (Sweden)

    Fernández, Pablo Sandoval

    2011-08-01

    Full Text Available Abstract: The new European Directive2010/31 is trying to achieve a 20%reduction in greenhouse gas emissionsbellow 1990 levels, and by 30% in theevent of an international agreementbeing. The E.U. has a major goal to reduceour oil dependency and use morerenewable energy, especially in buildingswhere 40% of the total energy consumptiontakes place. The Directive wants toestablish a plan to achieve our goal tocompletely reduce the use of energy inbuildings by 2020. The new buildingsoccupied and owned by public authoritiesmust comply with the proposed regulationby 2018 to serve as an exampleto the private sector. By increasing renewableenergy sources the goal is to reducethe Greenhouse effect since we arealready noticing it in our daily lives andcontinuing being the global and multilateralengine of the policies against theClimate Change.Resumen: La nueva Directiva Comunitaria31/2010 pretende la consecución de una reducciónde los gases de efecto invernadero en un20% con respecto a 1990, que podría incrementarseen un 30% si existe un compromiso internacional.La UE se ha marcado como objetivo lasustitución del empleo de combustibles fósilespor energías renovables y una mayor eficienciaenergética, especialmente en los edificios dondese consume el 40% del total de energía de la UE.Esta Directiva establece la obligatoriedad de losEstados miembros de adoptar políticas y planespara conseguir que los edificios de nueva construcciónsean de consumo de energía nulo en el2020. Los edificios de titularidad pública deberánadelantarse al 2018 en dicho objetivo comopapel ejemplarizante que toda Administracióndebe jugar. Con este paso y con una sustituciónprogresiva del empleo de combustibles fósilespor energías renovables, la UE pretende mitigarlos graves efectos del calentamiento global, queya empezamos a notar en nuestra vida cotidiana,y continuar siendo el motor global y multilateralde las políticas contra el Cambio Climático.

  9. Nueva Guinea ante la Autonomía Regional, un desafío pendiente

    Directory of Open Access Journals (Sweden)

    Claribel del Rosario Castillo Úbeda

    2012-09-01

    Full Text Available La Autonomía Regional de la Costa Caribe de Nicaragua es una temática abordada desde el enfoque de las representaciones sociales que permite conocer de que manera la población de Nueva Guinea, percibe el régimen autonómico; asimismo la identificación de posibles estrategias de definición política y administrativa de este territorio mestizo, que según la Ley 137 es parte de la Región Autónoma Atlántico Sur −RAAS−, no obstante desde el Estatuto de de las Regiones de la Costa Atlántica de Nicaragua y su Reglamento en el artículo 42, no hubo claridad en su jurisdicción.El diseño de investigación tuvo un enfoque cualitativo, de corte transversal, cuyos instrumentos de recopilación de información fueron entrevistas individuales y grupales, con representatividad de todos los sectores sociales y políticos.Se Identificaron diferentes apreciaciones relativas a la conceptualización y sentido de inclusión al régimen autonómico, que puede resumirse en dos posiciones. Una quienes han visto en la autonomía una oportunidad para que el municipio alcance mayores niveles de desarrollo si se integra a la región con los derechos establecidos en la Ley No. 28, y otra, quienes han pensado en una salida que implica la conformación de una nueva Región Autónoma.También se aportan elementos a las autoridades y organizaciones de la Sociedad Civil sobre el sentir de la población respecto a esta situación Los hallazgos sugieren que la población necesita mayor divulgación de la Ley para el conocimiento de sus contenidos, y a partir de ello realizar una consulta amplia a sus habitantes antes de definir el futuro de este municipio. También se ha demandado urgentemente una respuesta clara a la indefinición política – administrativa. 

  10. USO DE LA PLATAFORMA VIRTUAL DEL RECINTO URACCAN-NUEVA GUINEA, II SEMESTRE 2012

    Directory of Open Access Journals (Sweden)

    Margarita Arastenia Zamora Huete

    2013-10-01

    Full Text Available Se valora el uso de la plataforma virtual del recinto URACCAN-Nueva Guinea, en el área  de Ciencias Administrativas e Informática, implementada durante el II semestre del 2012. Se desarrolló bajo un enfoque cuantitativo empleando la encuesta como técnica de recolección de datos y entrevistas a fuentes específicas. La investigación da mayor relevancia a la plataforma virtual Moodle y sus características por ser el software educativo utilizado por el recinto universitario para desarrollar los procesos educativos en los entornos virtuales.Los resultados muestran el poco uso de la plataforma virtual, tanto de estudiantes y docentes, aunque la universidad ha realizado esfuerzo por capacitar a los docentes en metodologías a través de entornos virtuales; empero, el diseño de los cursos por algunos docentes no incentiva su uso: son pocos atractivos y no se aprovechan todas las opciones que la plataforma otorga para su uso eficiente. Los estudiantes y docentes ven con buenas expectativas y aprueban de manera complementaria la utilización de plataformas virtuales para el desarrollo de sus clases, ya que existen pocas condiciones en la universidad en cuanto al acceso y equipos para su implementación.SummaryThis study was carried out in order to evaluate the virtual platform use in URACCAN-Nueva Guinea campus, in the area of Administrative Sciences and Informatics, implemented during the second semester of the year 2012. It was developed with a quantitative approach using the survey as a technique for data collection and interviews with specific sources. The research gives major importance to the Moodle virtual platform and its characteristics, for being the educational software used by the campus to develop educational processes in virtual environments.The results show little use of the virtual platform, both by students and teachers, although the university has made efforts to train teachers in methodologies through virtual environments

  11. La Nueva Generación de las Power Line Communications en el Servicio Triple Play

    Directory of Open Access Journals (Sweden)

    Luís Enrique Conde del Oso

    2010-09-01

    Full Text Available Normal 0 21 false false false ES-TRAD X-NONE X-NONE MicrosoftInternetExplorer4 st1:*{behavior:url(#ieooui } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Se explica las nuevas características presentes en la Nueva Generación de los sistemas Power Line Communication, así como las actuales posibilidades de los nuevos y novedosos servicios a ofertar con estos sistemas. Otros de los aspectos abordados en el artículo son la experiencia cubana en la implementación de varios diseños de redes con este tipo de tecnología, así como los principales parámetros que deben ser validados en una prueba de aceptación de estos sistemas, con vistas a pasar las rigorosas pruebas que exigen los Órganos Reguladores para garantizar la coexistencia armoniosa de esta novedosa tecnología con otras ya presentes en nuestras Redes de Telecomunicaciones. Finalmente se muestran algunos diseños que facilitan brindar a través de estos sistemas un servicio Triple Play, a los operadores de telecomunicaciones, con orientación al uso de la baja tensión y mas específicamente hacia el interior de las edificaciones, donde el tendido eléctrico es propiedad del dueño del inmueble, permitiendo de esta manera a los Operadores de Telecomunicaciones tener un completo acceso a la Red, facilitándoles una acción inmediata ante

  12. METODOLOGÍAS EN LA ENSEÑANZA DE LA DERIVADA: URACCAN-NUEVA GUINEA

    Directory of Open Access Journals (Sweden)

    William Oswaldo Flores López

    2013-10-01

    Full Text Available Esta investigación describe la metodología que utilizan profesores de la URACCAN -Nueva Guinea, en la enseñanza-aprendizaje de la Derivada a estudiantes de Administración de Empresas, y cómo esta metodología educativa influye en el rendimiento de la asignatura “Matemática Financiera”. Fue un estudio de caso en el que participaron dos profesores de matemática; los datos fueron obtenidos a través de un cuestionario y entrevista abierta; además, una encuesta que se le suministró al alumnado en las que se les solicitó información relacionada a los procesos metodológicos en el aula. El análisis se desarrolló en función de las redes sistémicas y los resultados muestran que existen diferencias significativas a la hora de abordar el contenido, los resultados comparativos favorecen a los estudiantes a quienes se les facilitó  clases en  la enseña de la Derivada con pertinencia al contexto social y en cuanto al profesor que aborda la Derivada desde el enfoque tradicional, se evidencian calificaciones bajas por parte del estudiantado.SummaryThis research describes the methodology that is been used by teachers of URACCAN-Nueva Guinea, in the teaching and learning of the derivatives with students of Business Administration, and how this educational methodology influences the performance of "Financial Mathematics" as a subject. In this case-study two mathematics teachers participated; the data were obtained through a questionnaire and open interviews, as well as a survey that was provided to the students in which they requested information related to the methodological processes in the classroom.  The analysis was developed based on the systemic networks and the results demonstrated significant differences in addressing the content. The comparative results favor students, due to the fact that they were provided with training classes related to the derivative with pertinence to the social context; and as for the teacher who teaches

  13. La gran red: una era nueva entre la ciencia y el mito

    Directory of Open Access Journals (Sweden)

    María del Rosario Contepomi

    2007-03-01

    Full Text Available El propósito del trabajo es relacionar concepciones en torno al concepto red adoptadas por el movimiento espiritualista "Nueva Era" de la ciudad de Posadas, Misiones, Argentina, con aquellas planteadas por teóricos de la "Era de la Información y Comunicación" en el campo de las ciencias sociales. Dadas la complejidad y amplitud que se atribuye a esta noción, hemos denominado la Gran Red a esa construcción fáctica y virtual a la que se le asignan múltiples denominaciones: interconexión, interrelación, articulación. Estos complejos y heterogéneos vínculos se desarrollan entre elementos, dimensiones y niveles diferentes, tales como materialidad y espiritualidad, hombre y naturaleza, sociedad e individuo. Conforme a ello, nos preguntamos respecto a las creencias religiosas, creaciones ideológicas, producciones científicas o construcciones mitológicas que conforman el mundo-red de la cosmovisión la Nueva Era y la cultura-red de los enfoques socio-antropológicos.The purpose of this work is to relate conceptions around the concept of net adopted by the spiritualist movement "New Era" from the city of Posadas, Misiones, Argentina, with those considered by theorists of the "Era of Information and Communication" in the field of Social Sciences. Given the complexity and range that it is attributed to this notion we have designated the Great Net to that factual and virtual construction which is assigned multiple names: interconnection, interrelation, articulation. These complex and heterogeneous links develop among elements, dimensions and different levels, such as material nature and spirituality, man and nature, society and the individual. In accordance with that we ask ourselves regarding religious beliefs, ideological creations, scientific productions or mythological constructions that constitute the world-net of the view of the world of the New Era and the culture-net of the socio-anthropological approaches.

  14. The Movement of Tlaxcaltecas Indians Families to North Region of Nueva Galicia (Virreinato de la Nueva España. A Policy of Colonization and Pacification of the Spanish Empire at the End of the XVI Century

    Directory of Open Access Journals (Sweden)

    José Rojas Galván

    2016-07-01

    Full Text Available At the end of the XVI century, the Spanish empire had the necessity to create a series of strategies to access deposits of metal deposits located them in the North of Nueva España. These metal deposits were very important to the colony economy. The porpouse of this text in to analize the colonization and pacification policy that the Spanish goverment used in the North of Nueva Galicia during this history period of time, in which a group of tlaxcaltecas families took the leading role. The method used en this research is the historical reconstruction, which give us elements to build up all the past events of the differents sources —vestiges and testimonies— already analized. All this let us know a successfuly colonial policy which help the colonial government to extracted the silver, and also contribuid to legitimize the expansion of tlaxcalteca people in North of Nueva España. Also we conclude two kinds of aculturation: the macroestructural and the microestructural, both affecting in a considerate way the two different social groups wich consider in the same space.

  15. Comunicación y nuevas tecnologías: una lectura que demanda acción

    Directory of Open Access Journals (Sweden)

    Lic. Elena del Carmen Pérez Martínez

    2002-01-01

    Full Text Available Uno de los factores que caracterizará, probablemente, en el futuro, a estos años en que cruzamos de un siglo a otro es la explosión de las Nuevas Tecnologías de la Información y de la Comunicación y la consecuente reinvención de lo cotidiano a partir de su inserción en todas las esferas del quehacer humano. Paralelamente, aunque no simultáneamente, al acontecimiento –fenomenológico, en cuanto sucede en el mundo físico– se va conformando un campo teórico–crítico que da cuenta de su existencia en el campo discursivo; los lenguajes mediatizados por las Nuevas Tecnologías de la Información y su incidencia en el modus vivendi, comienzan a ser analizados desde distintas disciplinas.

  16. Movimientos sociales y nuevas prácticas políticas en argentina. Las organizaciones piqueteras

    Directory of Open Access Journals (Sweden)

    Maristella Svampa

    2004-04-01

    Full Text Available En la Argentina de la última década emergieron nuevas formas de organización política y acción colectiva cuyas marcas mayores son la acción directa, la auto-organización y una importante dinámica asamblearia. Tres tipos de experiencias ilustran de manera diferente estas nuevas prácticas: las agrupaciones piqueteras (desocupados, las asambleas barriales y las fábricas recuperadas por sus trabajadores. Este artículo abordará algunos de los aspectos novedosos que presenta uno de estos movimientos, el que sin duda constituye, por encima de su diversidad ideológica, el fenómeno más disruptivo de los años 90: el movimiento piquetero.

  17. El contrato de Factoring y la nueva Factura Cambiaria. Consideraciones sobre el contrato y el título valor

    Directory of Open Access Journals (Sweden)

    El contrato de Factoring y la nueva Factura Cambiaria. Consideraciones sobre el contrato y el título valor

    2010-07-01

    Full Text Available El presente artículo aborda el análisis del contrato de factoring desde diferentes perspectivas, a saber: su definición, obligaciones, clases, interpretación, regulación de las compañías de factoring, y esquema de eficacia negocial. A partir de los anteriores puntos se analiza la incidencia de la nueva factura unificada sobre el negocio jurídico de factoring, y se demuestra como el deber de información puede conducir a prevenir las posibles falencias de la nueva factura unificada.Esperamos así entregar al lector un material de utilidad práctica, en el que además de abordar los aspectos legales y jurídicos del factoring y la factura unificada, se entreguen también suficientes elementos de juicio para la mejor comprensión de cada una de ellas.

  18. El contrato de Factoring y la nueva Factura Cambiaria. Consideraciones sobre el contrato y el título valor

    Directory of Open Access Journals (Sweden)

    Camilo Franco

    2010-06-01

    Full Text Available El presente artículo aborda el análisis del contrato de factoring desde diferentes perspectivas, a saber: su definición, obligaciones, clases, interpretación, regulación de las compañías de factoring, y esquema de eficacia negocial. A partir de los anteriores puntos se analiza la incidencia de la nueva factura unificada sobre el negocio jurídico de factoring, y se demuestra como el deber de información puede conducir a prevenir las posibles falencias de la nueva factura unificada. Esperamos así entregar al lector un material de utilidad práctica, en el que además de abordar los aspectos legales y jurídicos del factoring y la factura unificada, se entreguen también suficientes elementos de juicio para la mejor comprensión de cada una de ellas.

  19. Las nuevas tecnologías y redes sociales aplicadas al turismo. Caso práctico: turismo de Segovia

    OpenAIRE

    Gozalo Sanz, Noelia

    2013-01-01

    Las nuevas tecnologías se han adaptado en un breve período de tiempo a todos los ámbitos de la sociedad y más aún en lo referente al ocio y al turismo, convirtiéndose este mercado en una de las principales industrias a nivel mundial y siendo uno de los más implicados en la promoción en la red. Las nuevas tecnologías y las redes sociales que nos llegan a través de Internet, no son solo un nuevo canal de comunicación, sino un canal de comercialización muy potente, que nos ha abierto las puertas...

  20. Filosofía y literatura: dos herramientas necesarias ante los retos de una nueva Ilustración

    Directory of Open Access Journals (Sweden)

    Asunción Herrera Guevara

    2017-01-01

    Full Text Available El ciudadano global necesita deliberar sobre los nuevos fenómenos globales. Debe preguntarse hacia dónde nos encamina la globalización y cuáles son sus consecuencias. El presente trabajo propone dirigir la globalización hacia una nueva Ilustración. Esta nueva Ilustración tendría que alcanzar lo que toda Ilustración promete: la emancipación del hombre. Mostraré que la Filosofía y la Literatura son dos herramientas necesarias para reflexionar sobre los actuales problemas éticos y políticos y, por ende, para alcanzar la emancipación. La metodología empleada será un análisis hermenéutico de textos filosóficos y literarios con el fin de argumentar mi propuesta.

  1. Reinforcer magnitude and rate dependency: evaluation of resistance-to-change mechanisms.

    Science.gov (United States)

    Pinkston, Jonathan W; Ginsburg, Brett C; Lamb, Richard J

    2014-10-01

    Under many circumstances, reinforcer magnitude appears to modulate the rate-dependent effects of drugs such that when schedules arrange for relatively larger reinforcer magnitudes rate dependency is attenuated compared with behavior maintained by smaller magnitudes. The current literature on resistance to change suggests that increased reinforcer density strengthens operant behavior, and such strengthening effects appear to extend to the temporal control of behavior. As rate dependency may be understood as a loss of temporal control, the effects of reinforcer magnitude on rate dependency may be due to increased resistance to disruption of temporally controlled behavior. In the present experiments, pigeons earned different magnitudes of grain during signaled components of a multiple FI schedule. Three drugs, clonidine, haloperidol, and morphine, were examined. All three decreased overall rates of key pecking; however, only the effects of clonidine were attenuated as reinforcer magnitude increased. An analysis of within-interval performance found rate-dependent effects for clonidine and morphine; however, these effects were not modulated by reinforcer magnitude. In addition, we included prefeeding and extinction conditions, standard tests used to measure resistance to change. In general, rate-decreasing effects of prefeeding and extinction were attenuated by increasing reinforcer magnitudes. Rate-dependent analyses of prefeeding showed rate-dependency following those tests, but in no case were these effects modulated by reinforcer magnitude. The results suggest that a resistance-to-change interpretation of the effects of reinforcer magnitude on rate dependency is not viable.

  2. La nueva novela histórica ficción-realidad del héroe

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    Carolina lópez Sánchez

    2017-08-01

    Full Text Available La nueva novela histórica toma la realidad histórica con sus aconteceres para convertirlos en el asunto central de la novela. El objetivo del presente trabajo parte de la pregunta ¿cómo a través de la ficción se presenta a un personaje de la historia (Simón Bolívar como un héroe real y desvanecer el concepto del héroe intachable?, creando una reflexión sobre las situaciones que se presentan en la realidad a la cual se pertenece; para el desarrollo del trabajo se toman bases teóricas desde: Nueva novela histórica, ficción-realidad, héroe y la obra la carroza de Bolívar del escritor colombiano Evelio Rosero Diago. La novela instiga a descubrir la otra faceta de Bolívar y desvanecer la concepción tradicional de héroe. La propuesta permite tomar desde la posición de la literatura la inclinación por lecturas de Nueva novela histórica, donde los personajes históricos (héroes se muestran como hombres de carne y hueso, para ver que también tuvieron sentimientos con aciertos y desaciertos, con equivocaciones como la humanidad de nuestra cotidianidad, y ponernos a la par como hombres que somos, capaces de reconocernos y a la vez de reconocer al otro, así la Nueva Novela Histórica permite dar mayor significación a la narrativa.

  3. Fundamentos Físicos de las Nuevas Tecnologías Informáticas: Enunciados de los problemas

    OpenAIRE

    Beléndez Vázquez, Augusto

    1996-01-01

    Fundamentos Físicos de las Nuevas Tecnologías Informáticas: Enunciados de los problemas (óptica geométrica, óptica ondulatoria, óptica de Fourier, holografía, óptica electromagnética, dispositivos electroópticos, dispositivos acustoópticos, fibras ópticas y comunicaciones, computación óptica).

  4. Nueva ruralidad, vínculos campo-ciudad: El caso del cantón Cuenca período 2000-2010.

    OpenAIRE

    Bernal Campoverde, María Elena

    2014-01-01

    El concepto de nueva ruralidad trata de analizar la transformación que acontece en la sociedad rural, tradicionalmente caracterizada por la práctica de actividades primarias y un sistema de creencias y valores en común. Algunos debates acerca de nueva ruralidad, resaltan que la novedad radica en distanciarse del enfoque economicista-primario para analizar otras actividades que ocurren en el campo, poniendo en evidencia que la pluriactividad es muy importante en ciertos escenarios rurales. Por...

  5. Las nuevas tecnologías en la terapia cognitivo-conductual: una revisión

    Directory of Open Access Journals (Sweden)

    Xavier Bornas

    2002-01-01

    Full Text Available En este trabajo se hace un análisis del uso de las nuevas tecnologías como elemento terapéutico en el campo de la psicología cognitivo-conductual. Tras seleccionar las palabras-clave se realizó una búsqueda en las bases de datos Eric, PsycInfo, Dissertations Abstracts Online, Scy Search, Sociological Abstracts y Pascal a partir de 1990. La revisión de los trabajos publicados proporcionó información sobre tecnología usada, trastorno específico, muestra y diseño, descripción del funcionamiento y resultados. El ordenador aparece como la tecnología más empleada y los trastornos de ansiedad son los que han recibido más atención mediante nuevas tecnologías. La realidad virtual e internet son más usadas a partir de 1995. La eficacia de los tratamientos es elevada y comparable a la de los más tradicionales. Aunque los resultados indican un creciente uso de las nuevas tecnologías en la terapia cognitivo-conductual, esto es más cierto en los ámbitos académicos que en los clínicos. Estos aspectos se tratan en la discusión

  6. Educar haciendo uso de las nuevas tecnologías y medios digitales. Algunas pautas básicas

    Directory of Open Access Journals (Sweden)

    Ana Mª Fermoso García

    2009-01-01

    Full Text Available Las nuevas tecnologías y los medios digitales plantean nuevas posibilidades educativas, dando paso a lo que se conoce como e-learning. Sin embargo, contar con estos medios no garantiza sin más el conseguir los mejores resultados de aprendizaje, pues también se requiere la implantación paralela de nuevos modelos pedagógicos. Estos modelos afectarán tanto al diseño de los materiales educativos en formato digital, como al modo de utilización de los mismos en el aula. Los objetos de aprendizaje son la principal opción a la hora de crear los materiales educativos. En este artículo se hace una breve introducción de los conceptos básicos sobre objetos de aprendizaje y sobre algunos principios metodológicos fundamentales a la hora de diseñar estos materiales educativos en formato digital contenidos en los objetos de aprendizaje. En el resto de los artículos de este monográfico se describen distintas experiencias reales a la hora de poner en práctica esta "digitalización" del aula, demandada por un nuevo modelo educativo en respuesta al uso de las nuevas tecnologías en el aula.

  7. Anomalous arsenic content in soils of Villa Nueva, Department Calingasta, Province of San Juan Argentina. Analysis of the source

    International Nuclear Information System (INIS)

    Arroqui Langer, A.; Cardús, A; Echenique, O.; Nozica, G.

    2010-01-01

    In soils entysol type of Villa Nueva, were detected anomalous arsenic values ​​(not recommended for agricultural soils). This location downstream of old mines of Au and Ag, Pb, and Zn is basing its economic growth in the agriculture, forestry and mining. In this study the geochemistry of the different areas of contribution related to the genesis of the soils analyzed. Two areas were considered for the interpretation of the results : one associated with the upper watershed of Brown River (upstream of the town of Villa Nueva) and another related to the geomorphological units on which the village is developed. The evaluation of results from the analysis of 443 samples, allows for content As high in the regional context, with more content, widespread in sub-basins upstream of the village under study, irrespective of the sectors where it was developed historic mining, so a naturally occurring arsenic in soils of Villa Nueva is assigned. Bioavailability studies are needed to assess the risk of existing toxicity in soils

  8. Nueva especie de Ilyodon (Cyprinodontiformes: Goodeidae de la cuenca del río Balsas, México

    Directory of Open Access Journals (Sweden)

    Joel Paulo-Maya

    2000-06-01

    Full Text Available Una nueva especie, Ilyodon cortesae, se describe del río San Juan Tacámbaro, Michoacán, México. Usamos 129 organismos pertenecientes a I. whitei, 60 de I. furcidens y 84 de la nueva especie para nuestro análisis. Estos incluyeron muestras de ambos sexos. La nueva especie se distingue de I. whitei y de I. furcidens por su perfil cefálico convexo, el tamaño y disposición de los poros de la línea lateral en el preorbital, la base del pedúnculo caudal delgado, sus dientes fuertemente bífidos y en la forma de las precigapófisis de las vértebras caudales.A new species of the fish genus Ilyodon is described from San Juan Tacámbaro river, Michoacán, México 19° 10’ 42’’ N, 101° 20’ 45" W. We used 129 specimens representing I. whitei, 60 of I. furcidens and 84 of the new species for our analyses. These included samples of both sexes. The new species is distinguished from I. whitei and I. furcidens by its strongly convex cephalic profile, the size and disposition of the pores of the lateral line of the preorbital, the thinner caudal peduncle, its strongly bifid tooth and the form and size of neural prezygapophyses of caudal vertebrae.

  9. Nuevas formas de organización para la innovación administrativa y técnica

    Directory of Open Access Journals (Sweden)

    Luis Alfredo Vega Osuna

    2016-01-01

    Full Text Available En la actualidad, la globalización está marcando un nuevo mundo sin fronteras, donde la competencia en el mercado de hortalizas se hace más intensa y se requiere ser más innovador y competitivo para permanecer en el mercado. Las nuevas formas de organización en el trabajo representan una ventana abierta a fomentar y crear las condiciones del trabajo colaborativo y del intercambio de ideas para lograr la innovación organizacional, pieza clave para hacer frente a los retos que presenta el entorno mundial. Entre los principales autores que analizan las nuevas formas de organización destacan Heyderbrand (1989, Clegg (1990 Rivas (2002 y por la innovación se encuentran Damanpour y Evan (1999 y Coopey (1997. El objetivo de este artículo consistió en analizar las nuevas formas de organización que presenta la Empresa Hortícola Sinaloense en el proceso de innovación. Metodológicamente este estudio es una investigación documental bajo un enfoque analítico. Se concluye que alrededor del 75% de las empresas hortícolas en Sinaloa adoptan un modelo tradicional de producción y comercialización, que en su esencia no generan una innovación que los ayude a ser competitivos.

  10. LOS DETERMINANTES DEL PRECIO DE LA VIVIENDA NUEVA EN COLOMBIA: 1997-2013

    Directory of Open Access Journals (Sweden)

    Hernando Rendón Obando

    2016-10-01

    Full Text Available El presente artículo examina, a través de la metodología series de tiempo, los factores que determinaron la dinámica de los precios de la vivienda nueva en Colombia en el período 1997-2013. Para el desarrollo de dicha metodología, se  determina el grado de integración de cada una de las series, mediante los test de raíces unitarias; luego se contrasta cointegración entre las variables a fin de detectar relaciones de equilibrio o de largo plazo entre las series. Después de aplicar contrastes de exogeneidad  débil, se construye el modelo de corto plazo  para las variables endógenas. Los resultados indican que variables como el nivel de ingreso real per-cápita  y los costos de la construcción impactan estos precios a corto y largo plazo, mientras que la  tasa de interés real del crédito hipotecario y los precios de la vivienda usada inciden solo en el largo plazo.

  11. Barren Forests. Missing Indian villages on the South Coast of Nueva Galicia during the Colonial Period

    Directory of Open Access Journals (Sweden)

    Ramón Goyas Mejía

    2017-01-01

    Full Text Available This analysis focuses on the disappearance of the Indian villages during the colonial period in the town of Purification belonging to Nueva Galicia. The natural physical characterization of the region was first addressed in order to make the historical man-nature relationship relevant since pre-Columbian times. This relationship highlights the importance of the loss of population during the colonial period as a central research topic. This research not only analyzes historical demography, but also addresses the consequences of the disappearance of these entities from the geographical area in which they were located; furthermore, it is an analysis of the relationship of the people as geospatial entities and their environment. Based on the theoretical premise of so-called "nodes" and "networks" for the construction of a territory, this essay argues that as the indigenous people were disappearing, they failed to socially articulate the emergence of spaces that in theory became part of the government. These areas were ultimately "nobodyareas"; areas not controlled by survivors or new settlers who took centuries to settle in the region of study.

  12. Nuevas obras de Carlos de Haes y de Aureliano de Beruete

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    Arias Anglés, Enrique

    2005-09-01

    Full Text Available El objeto de estas líneas es el de dar a conocer y catalogar cuatro nuevas obras de Carlos de Haes (Bruselas, 1826-Madrid, 1898 y otras dos de Aureliano de Beruete (Madrid, 1845- Madrid, 1912. Tres de las de Haes pertenecen a colecciones particulares madrileñas y la otra ha aparecido en el comercio alicantino; mientras que las dos de Aureliano de Beruete son de colección particular madrileña. Comenzaremos este análisis por las de Haes, tanto por razones cronológicas como por haber sido este pintor maestro de Beruete. La primera de ellas pertenece a la colección Rudolf Gerstenmaier (Madrid, y es un óleo sobre lienzo, de 0,35 x 0,65 m., firmado en rojo en el ángulo inferior izquierdo "C. de Haes", y que por representar un bello paisaje de los llamados de alta montaña, que no podemos identificar, lo titularíamos Vista de cordillera (Fig. 1...

  13. Saúl Yurkievich en la “nueva crítica” latinoamericana

    Directory of Open Access Journals (Sweden)

    Libertad Garzón Hurtado

    2016-07-01

    Full Text Available Saúl Yurkievich pertenece a una larga tradición de escritores y poetas que se dedican también a la lectura experta de las obras literarias. En América Latina, Octavio Paz, Jorge Luis Borges, Julio Cortázar, José Lezama Lima y Severo Sarduy continúan en la segunda mitad del siglo XX la tradición iniciada por los poetas modernistas. Saúl Yurkievich es heredero directo de esta generación de escritores-críticos y quizás uno de los más radicales exponentes de lo que, apropiándonos de la expresión de Paz, podríamos denominar la poesía vista desde la poesía. Este artículo presenta una primera aproximación a la obra crítica de Yurkiévich en el marco de lo que Guillermo Sucre denominó la tradición de la “nueva crítica” latinoamericana.

  14. EL PENSAMIENTO COMPLEJO Y LA TRANSDISCIPLINARIEDAD: FENÓMENOS EMERGENTES DE UNA NUEVA RACIONALIDAD

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    SERGIO NÉSTOR OSORIO GARCÍA

    2012-01-01

    Full Text Available Hoy tenemos que aprender a diferenciar y a distinguir, sin tener por ello que separar. En este sentido hay dos pares de conceptos claramente diferenciables y no por ello separables: por un lado, los conceptos complejidad y pensamiento complejo y por otro lado, conocimiento disciplinar (multi-poli e interdisciplinar y conocimiento transdisciplinar. Para la ciencia clásica el pensamiento complejo y el conocimiento transdisciplinar es un absurdo, pero para éstos, el ideal de racionalidad de la ciencia clásica es necesario y válido, pero insuficiente para comprender la Realidad en el tiempo actual. Se hace necesario un nuevo paradigma de racionalidad que permita pensar la unidad de los conocimientos fragmentados en disciplinas de cara a la supervivencia de la especie humana en esta era que se ha convertido en planetaria. La presente reflexión busca presentar desde las apuestas conceptuales de Edgar Morin (pensamiento complejo y de Basarab Nicolescu (conocimiento transdisciplinar la dimensión epistemológica, ontológica y metodológica de la emergencia de esta nueva racionalidad.

  15. El caso Breivik como paradigma de la nueva violencia política en Europa

    Directory of Open Access Journals (Sweden)

    Jesús Pérez

    2014-01-01

    Full Text Available Tras el doble atentado en Noruega del 22 de julio de 2011 cometido por Anders Behring Breivik, el terrorismo en Europa se enfrenta a una nueva amenaza. La novedad ideológica de Breivik es escasa, salvo por actualizar peligros que parecían del pasado. Por el contrario, su novedad operativa sí es relevante, ya que demuestra la posibilidad de la actuación de "lobos solitarios" en Europa y ejemplifica de qué manera el occidental medio puede actuar con un potencial muy alto de causar daños. Se concluye con el avance de un nuevo paradigma, el de sujetos que actúan movidos políticamente por un objetivo irrealizable, para favorecer a grupos que son extremadamente abstractos o no existen, lo que les proporciona un blindaje ideológico sin capacidad alta de movilización pero con destacadas cotas de destrucción.

  16. Una nueva especie del grupo Hyloscirtus larinopygion (Amphibia: Anura: Hylidae del suroccidente de Colombia

    Directory of Open Access Journals (Sweden)

    Jonh Jairo Mueses-Cisneros

    2008-01-01

    Full Text Available Se describe una nueva especie del grupo Hyloscirtus larinopygion del Nudo de los Pastos en el departamento de Nariño, Colombia. Hyloscirtus tigrinus sp. nov. puede ser distinguida fácilmente de sus especies similares por la presencia de un tubérculo calcar carnoso y prominente, además de su distintivo patrón de coloración. Se realizan algunos comentarios sobre la coloración de la garganta y coloración ventral en Hyloscirtus caucanus, H. larinopygion, H. lindae y H. tigrinus. La coloración de la garganta es altamente variable, por lo tanto no puede ser utilizada para diagnosticar a estas especies.A new species of the Hyloscirtus larinopygion group from Nudo de los Pastos, Nariño department, Colombia is described. Hyloscirtus tigrinus sp. nov. can be distinguished easily from similar species by the presence of a fleshy and prominent calcar tubercle and by its distinctive color pattern. Some remarks on throat and ventral coloration in Hyloscirtus caucanus, H. larinopygion, H. lindae and H. tigrinus are presented. The throat coloration is highly variable and cannot be used to diagnose any of these species.

  17. Nuevas políticas de seguridad vial y motivación de los ciudadanos

    Directory of Open Access Journals (Sweden)

    Jordi Tena-Sánchez

    2012-01-01

    Full Text Available La evidencia empírica señala que las nuevas políticas de tráfi co aplicadas desde 2004 han tenido una fuerte incidencia positiva sobre la conducta de los conductores que se ha traducido en importantes descensos de la siniestralidad. No obstante, no se ha prestado atención a cuáles han sido los mecanismos sociales que dan cuenta de ese cambio ni a cuál ha sido el impacto en la motivación de los ciudadanos. ¿Han tenido dichas políticas efectos "pedagógicos"? En el presente trabajo se analizan los datos disponibles que permiten responder a esta pregunta. Dichos datos no permiten afi rmar que las reformas hayan tenido ningún tipo de impacto positivo sobre la motivación de los conductores y la mejora del cumplimiento parece deberse al efecto disuasorio de las sanciones.

  18. Bases científicas de la terapia de conducta: nuevas propuestas para un viejo problema

    Directory of Open Access Journals (Sweden)

    Xavier Bornas

    2002-01-01

    Full Text Available En este trabajo se revisa críticamente el recurrente tópico de las bases científicas de la Terapia de Conducta. Asumiendo que la investigación científica de la conducta es conveniente, si no necesaria, para el desarrollo tecnológico y aplicado, se propone tomar en consideración algunos conceptos relativamente nuevos de la Ciencia (por ejemplo, el de caos determinístico y utilizarlos, al menos tentativamente, para procurar obtener un conocimiento mejor de la complejidad de la conducta humana. La incorporación de aquellos conceptos abre una nueva perspectiva complementaria para el estudio de la conducta que se caracteriza por: (a conceder una importancia capital al cambio o flujo continuo de conducta y los procesos de retroalimentación del sistema, (b destacar, además de las relaciones lineales, las de tipo no lineal entre la conducta y el ambiente, y (c tener en cuenta la emergencia de nuevos patrones de comportamiento. Se discute también la necesidad de la investigación de laboratorio y el análisis de los datos así obtenidos.

  19. Una nueva especie de Axonopus (Poaceae: Panicoideae: Paniceae de la Guyana de Colombia y Venezuela

    Directory of Open Access Journals (Sweden)

    Giraldo Cañas Diego

    1999-11-01

    Full Text Available Axonopus piccae, a new species of the series Barbigeri G. A. Black, is described and illustrated. The new species is known only from two areas of Guayana Region: Guainía (Colombia and Bolívar (Venezuela. Its inflorescence is polytelic and truncate.Based on SEM microphotographs, the characters of its upper anthecium are presented. Its morphological and anatomical relationships are discussed, and a key to the nearest species is provided.Se describe e ilustra Axonopus piccae, una nueva especie perteneciente a la serie Barbigeri G. A. Black, conocida únicamente de dos áreas de la región Guayana en Guainía (Colombia y Bolívar (Venezuela. Su inflorescencia es politélica y truncada. Se comentan las características de su antecio superior sobre la base de microfotografías al microscopio electrónico de barrido. Se discuten sus relaciones morfológicas y anatómicas. Se presenta una clave para separar las especies afines.

  20. Redes Corporativas Inmersivas. Nuevas formas de uso de las redes sociales

    Directory of Open Access Journals (Sweden)

    Jorge E. Giménez Hernando

    2011-07-01

    Full Text Available Las redes sociales se están imponiendo como forma de comunicación a través de Internet sobre cualesquiera otros formatos tradicionales, llegando incluso a eclipsar el más reciente y universal correo electrónico. De entre sus múltiples aplicaciones, destacan desde el punto de vista empresarial las redes sociales corporativas, que se conciben como un vehículo extraordinariamente eficaz para transferir el conocimiento que aporte a la compañía ventaja competitiva para posicionarse y operar en el mercado.Por otra parte, el auge del desarrollo de las nuevas tecnologías basadas en 3D, los mundos virtuales o la realidad aumentada, que se ha basado en los últimos años en entornos lúdicos y de esparcimiento, está comenzando a aplicarse a otro tipo de contenidos, que se intentan aprovechar de su realismo y motivación.El presente artículo presenta la realización de una experiencia piloto en que se han aunado ambos conceptos, aplicando las tecnologías de mundos virtuales a las redes sociales corporativas, y permitiendo la comparación de los resultados obtenidos con los acumulados en experiencias anteriores de acceso web tradicional. Dicha comparación se ha basado en las encuestas realizadas a los usuarios tras la experiencia piloto.