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  1. Soil Moisture Measurement through Time Domain Reflectometry (TDR). Irrigation Application; Medicion de la humedad del suelo por reflectometria en el dominio temporal (TDR). Aplicacion en irrigacion

    Energy Technology Data Exchange (ETDEWEB)

    Quinonez Pedroza, Hector E.; Ruelle, Pierre; Nemeth Ildiko [Cemagre, (France)

    2002-03-01

    Knowledge of how moisture varies in the soil is essential to determine the actual rate of evapotranspiration in crops and, thus, the amount of water necessary for irrigation. Lisimeters, tensiometers and the neutron probe have been widely used for precise measurement of soil moisture in order to calibrate models of irrigation scheduling or to calculate volumes of irrigation water. Despite the usefulness of such measurements, these methods have limited use because of problems like high cost of lisimeters and neutron probes as well as their strict regulation, limited range of validity of tensiometers. Moreover, the measurements obtained from these methods generally describe noncontinuous points in time. Time Domain Reflectometry (TDR) is a viable to such methods because of its precision and the continuity of its measurements. This study evaluates soil moisture, using the neutron and TDR methods in maize crop irrigated by gravity in closed furrows. The results show that even though the absolute determinations of moisture are different in the 30-90 cm profiles, moisture variations were similar in all cases and respond consequently to the additions of water and to evapotranspiration. Neutron probe drawback become evident on its no-continuous measurements contrasting with the continuous measurements of TDR, which allows a detailed analysis of the infiltration and evapotranspiration phenomenal at instantaneous time scales. [Spanish] El conocimiento de la variacion de la humedad del suelo es esencial para determinar la evapotranspiracion real de los cultivos. Esta ultima, a su vez, permite conocer las cantidades necesarias de agua de riego. Los lisimetros, los tensiometros y el aspersor de nuestro s han sido ampliamente usados para la medicion precisa de la humedad del suelo con propositos de calibracion de modelos de programacion del riego o para su utilizacion directa en el calculo de volumenes de riego. A pesar de la importancia de tales mediciones, su uso es muy

  2. Utilização da TDR para monitoramento da solução de nitrato de potássio em Latossolo Vermelho-Amarelo Use of tdr for monitoring the potassium nitrate solution in dystrophic Red-Yellow Latossol

    Directory of Open Access Journals (Sweden)

    Leonardo do N. Lopes

    2010-10-01

    Full Text Available O conhecimento da distribuição e armazenamento da solução no solo é de grande importância para a agricultura, pois a interação entre os nutrientes e a água é um dos fatores que influenciam diretamente no rendimento das culturas. Das várias técnicas utilizadas para o monitoramento da solução no solo, a reflectometria no domínio do tempo (TDR vem sendo bastante difundida entre os pesquisadores por apresentar inúmeras vantagens, dentre as quais a mensuração em tempo real e a possibilidade de leituras automatizadas. O principal objetivo desta pesquisa foi avaliar a distribuição da solução de KNO3 no perfil de um Latossolo Vermelho-Amarelo. Sondas de Reflectometria no Domínio do Tempo (TDR foram utilizadas para monitorar a distribuição de solução no solo aplicada por gotejadores de fluxo constante nas vazões de 2; 4 e 8 L h-1. Considerando-se os resultados de diferentes perfis, observou-se maior armazenamento da solução próxima ao gotejador, diminuindo progressivamente para frente de molhamento. Pouco mais da metade da solução aplicada (65% foi armazenada na primeira camada (0-0,10 m para todos os ensaios, e 22% foi armazenada na próxima camada (0,10-0,20 m. Comparando-se diferentes taxas de aplicação, observou-se maior armazenamento de água para o gotejador de 4 L h-1, com 60; 72 e 63% de solução de KNO3 aplicada acumulada na primeira camada (0-0,10 m para gotejadores de 2; 4 e 8 L h-1, respectivamente. Os resultados sugerem que, com base no volume e frequência utilizada neste experimento, seria vantajoso aplicar pequenas quantidades de água em intervalos mais frequentes para reduzir perdas por percolação.Knowledge of water distribution in soil is of great importance to agriculture, since water is one of the factors that most influence the yield of crops. There are many techniques used for monitoring of soil water content, the Time Domain Reflectometry (TDR has been widespread among researchers to present

  3. Número e espaçamento entre hastes de guia de onda para medida da umidade do solo com TDR Number and spacing between wave guide rods for measurement of soil water content with TDR

    Directory of Open Access Journals (Sweden)

    Eugênio F. Coelho

    2003-08-01

    Full Text Available Com este trabalho, objetivou-se avaliar o desempenho de diferentes modelos matemáticos para ajuste dos dados de umidade, em função da constante dielétrica aparente do solo, e a viabilidade de uso de guias de onda de duas e três hastes, com diferentes espaçamentos. Amostras de solo deformadas foram acondicionadas em segmentos de tubos de PVC de 0,075 m de diâmetro. Construíram-se 24 guias de onda com capacitor e 24 guias de onda sem capacitor, sendo que, para cada tipo, 12 guias de onda de duas hastes e 12 de três hastes, com espaçamento entre hastes de 0,009 a 0,022 m, de impedâncias previamente determinadas, foram inseridas no solo, após a saturação em cada segmento de tubo. Dados de umidade do solo determinados por gravimetria e da constante dielétrica aparente obtidos pelo analisador Trase System, foram tomados em cada recipiente durante a secagem do solo de 0,31 a 0,13 m³ m-3. Cinco modelos matemáticos foram ajustados aos dados de umidade em função da correspondente constante dielétrica aparente do solo e o efeito dos modelos na obtenção da umidade do solo, em função da constante dielétrica aparente, foi avaliado estatisticamente. O modelo de Malicki foi o de melhor ajuste dos dados da constante dielétrica aparente, em função da umidade do solo. As guias de onda de três hastes, de diâmetro 0,003 m, comprimento 0,15 m, com espaçamentos entre hastes de 0,017 m, foram as de melhor desempenho, enquanto as guias de onda de três hastes sem capacitor indicaram melhor desempenho na determinação da umidade do solo, comparadas com as de duas hastes sem capacitor. As guias de onda de três hastes sem capacitor apresentaram melhor desempenho na determinação da umidade do solo que as de três hastes com capacitor.The objective of this study was to evaluate the performance of different mathematical models to adjust the humidity data as a function of the apparent dielectric constant of the soil and to evaluate the

  4. Theseus: tethered distributed robotics (TDR)

    Science.gov (United States)

    Digney, Bruce L.; Penzes, Steven G.

    2003-09-01

    The Defence Research and Development Canada's (DRDC) Autonomous Intelligent System's program conducts research to increase the independence and effectiveness of military vehicles and systems. DRDC-Suffield's Autonomous Land Systems (ALS) is creating new concept vehicles and autonomous control systems for use in outdoor areas, urban streets, urban interiors and urban subspaces. This paper will first give an overview of the ALS program and then give a specific description of the work being done for mobility in urban subspaces. Discussed will be the Theseus: Thethered Distributed Robotics (TDR) system, which will not only manage an unavoidable tether but exploit it for mobility and navigation. Also discussed will be the prototype robot called the Hedgehog, which uses conformal 3D mobility in ducts, sewer pipes, collapsed rubble voids and chimneys.

  5. Umidade do solo no semiárido pernambucano usando-se reflectometria no domínio do tempo (TDR Soil moisture in Pernambuco semiarid using time domain reflectometry (TDR

    Directory of Open Access Journals (Sweden)

    Thais E. M. dos Santos

    2011-07-01

    Full Text Available Objetivou-se com o presente trabalho investigar a variabilidade temporal do conteúdo superficial da água no solo, através da reflectometria no domínio do tempo (TDR, em consequência das características de precipitação ocorridas no semiárido pernambucano, estudando esta dinâmica sob diferentes tipos de cobertura superficial do solo. O estudo foi realizado em uma encosta de uma bacia representativa, em um Argissolo Amarelo Eutrófico típico, onde foram instaladas quatro parcelas experimentais dotadas de duas sondas TDR, para investigação da umidade do solo e do sistema para monitoramento do escoamento superficial. Os tratamentos adotados foram: cobertura natural (CN, solo descoberto (SD, palma forrageira (P e barramentos, associados à cobertura morta (B+CM. A partir dos resultados obtidos durante o período de ocorrência de chuvas erosivas, a umidade do solo apresentou elevada variabilidade no tempo, estando relacionada aos diferentes tipos de cobertura e propriedades do solo. A cobertura morta mostrou ser a prática conservacionista mais adequada para manutenção da umidade do solo.Present study aimed to investigate the temporal variability of surface water content in soil by time domain reflectometry (TDR, as consequence of precipitation characteristics of Pernambuco semiarid, studying such dynamics under different types of the soil cover. The study was conducted in a slope of a representative catchment, in a Typic Hapludalf soil, where four experimental plots were installed with two TDR probes for soil moisture investigation as well as monitoring the runoff. Treatments were natural cover (CN, bare soil (SD, cactus (P and microdams associated with mulch (B + CM. From the results obtained during a period with erosive rainfall, it was found that soil moisture observed during the experimental period showed high variability in time, related to different types of coverage and soil properties. Mulching was the most appropriate

  6. Measuring water content in soil using TDR: A state-of-the-art in 1998

    International Nuclear Information System (INIS)

    Topp, G.C.; Ferre, P.A.

    2000-01-01

    Over the past decade or so, the development and continuing refinement of the time-domain reflectometry (TDR) technique for in-situ, nondestructive measurement of water content has revolutionized the study and management of the transfer and storage of water within the soil profile. The principles for the application of TDR to water content are now well accepted and straight forward. For many mineral soils, the calibration for water content has a linear relationship with the square root of the relative permittivity measured by TDR. This allows a two-point calibration. TDR-measured water content has been applied successfully to water balance studies ranging from the km scale of small watersheds to the nun scale of the root-soil interface. Soil probes can be designed to meet many and varied requirements. The performance of a number of probe geometries is presented, including some of their strengths and weaknesses. Although coated soil probes allow measurement in more conductive soils, the probe coatings alter the water-content calibration both in sensitivity and linearity. Three general options are available for determining profiles of soil water content from the soil surface to a depth of 1 m. Soil probes of differing total depths extending to the surface are the most accessible. Soil probes buried at selected depths provide easily repeatable values. The vertically installed single probe, Aith depth segments separated by diodes, allows repeated measurement in a single vertical slice. The portability of TDR instrumentation coupled with the simplicity and flexibility of probes has allowed the mapping of spatial patterns of water content and field-based spatial and temporal soil water content distributions. The usefulness and power of the TDR technique for characterizing soil water content is increasing rapidly through continuing improvements in instrument operating range, probe design, multiplexing and automated data collection. (author)

  7. The HLT, DAQ and DCS TDR

    CERN Multimedia

    Wickens, F. J

    At the end of June the Trigger-DAQ community achieved a major milestone with the submission to the LHCC of the Technical Design Report (TDR) for DAQ, HLT and DCS. The first unbound copies were handed to the LHCC referees on the scheduled date of 30th June, this was followed a few days later by a limited print run which produced the first bound copies (see Figure 1). As had previously been announced both to the LHCC and the ATLAS Collaboration it was not possible on this timescale to give a complete validation of all of the aspects of the architecture in the TDR. So it had been agreed that further work would continue over the summer to provide more complete results for the formal review by the LHCC of the TDR in September. Thus there followed an intense programme of measurements and analysis: especially to provide results for HLT both in testbeds and for the event selection software itself; to provide additional information on scaling of the dataflow aspects; to provide first results on the new prototype ROBin...

  8. Desempenho de modelos de calibração de guias de onda acopladas a TDR e a multiplexadores em três tipos de solos Performance of calibration models for TDR and multiplexer - connected waveguides in three soil types

    Directory of Open Access Journals (Sweden)

    Eugenio Ferreira Coelho

    2006-02-01

    Full Text Available O trabalho teve como objetivo avaliar modelos de calibração para dois tipos de guias de onda de TDR, referentes a dois equipamentos (Trase System e TDR 100, acopladas diretamente ao analisador de umidade ou a multiplexadores. Amostras de três tipos de solo foram acondicionadas em segmentos de tubos de PVC e saturadas. Dois tipos de guias de onda de três hastes, com capacitor e com resistor foram inseridas dentro de cada segmento de tubo com solo e conectadas a dois equipamentos de TDR, diretamente no testador de cabos ou via multiplexadores. Dados de umidade obtidos por gravimetria e da constante dielétrica foram tomados em cada coluna durante a secagem do solo da saturação até umidades próximas do limite inferior de disponibilidade de água por meio de leituras com as guias de onda conectadas ao testador de cabos e conectadas ao multiplexador. Um modelo polinomial cúbico foi ajustado aos dados da constante dielétrica do solo (épsilon e da correspondente umidade (teta e cinco modelos de determinação de q em função de e foram testados quanto ao desempenho. Os resultados mostraram que não houve diferença significativa na calibração das guias de onda com capacitor para uso com a TDR Trase System, considerando a conexão das guias ao analisador de umidade ou a multiplexadores. No caso da TDR 100, as guias de onda com resistor devem ser calibradas conforme o seu uso. O modelo cúbico foi o de melhor desempenho seguido pelo modelo de Roth que estimou, com boa exatidão, os valores da constante dielétrica e da umidade com a mais próximo de 0,5 para as guias de onda com capacitor que com as guias com resistor.The study aimed at evaluating of calibration models for two kinds of TDR waveguides used with Trase System and TDR 100 equipments linked to the cable tester or the multiplexer. Disturbed samples of three soils were packed in PVC columns and, after soil saturation, two TDR waveguides of three rods with capacitor and with

  9. Comparison of performance of inclinometer casing and TDR technique

    Science.gov (United States)

    Aghda, S. M. Fatemi; Ganjalipour, K.; Nabiollahi, K.

    2018-03-01

    TDR (Time Domain Reflectometry) and GPR (Ground Penetrating Radar) are two of the electromagnetic methods in applied geophysics, which using them for various applications are developing. The Time Domain Reflectometry is a remote sensing method that has been used for years to determine the nature of the materials and spatial location. The use of TDR system has led to innovative applications of it and comparing it with previous measuring techniques, since it has developed. In this study, not only a summary of the basics of TDR application for monitoring of ground deformation is offered, but also a comparison of this technology with other measurement techniques (inclinometer casing) is provided. Actually, this paper presents a case study in which the opportunity arose to compare these two technologies in detecting subsurface deformation in slopes. A TDR system includes a radar wave receiver & generator, a transmission line and a waveguide. The generated electro-magnetic pulse moves toward the waveguide within the conductor cable and enters the test environment. For this study, slopes overlooking the Darian dam bottom outlet, power house and spillway were instrumented with RG59/U coaxial cables for TDR monitoring and slope inclinometer. Coaxial cables - as a TDR sensor - and inclinometer casings were installed in a same bore hole where coaxial cable was attached to the inclinometer casing. Shear and tensile deformations of the cable, which is caused by ground movements, significantly impacts on cable reflection coefficient. In Darian dam boreholes, the cable points subject to the shear and stretch were correlated with deformation points of the inclinometer casings in incremental displacement graphs. This study shows that TDR technique is more sensitive than inclinometer casing for small movement in the slide planes. Because manual processing of TDR data is hard and need experienced personnel, the authors have designed an algorithm to compare the shape of the new TDR

  10. Soil volumetric water content measurements using TDR technique

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    S. Vincenzi

    1996-06-01

    Full Text Available A physical model to measure some hydrological and thermal parameters in soils will to be set up. The vertical profiles of: volumetric water content, matric potential and temperature will be monitored in different soils. The volumetric soil water content is measured by means of the Time Domain Reflectometry (TDR technique. The result of a test to determine experimentally the reproducibility of the volumetric water content measurements is reported together with the methodology and the results of the analysis of the TDR wave forms. The analysis is based on the calculation of the travel time of the TDR signal in the wave guide embedded in the soil.

  11. A new probe for in situ TDR moisture measurement

    Energy Technology Data Exchange (ETDEWEB)

    Yokuda, E. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Smith, R. (Sonsub Services, Inc., Houston, TX (United States))

    1993-01-01

    This paper explains the development of a new Time Domain Reflectometry (TDR) probe which can be inserted through waste and soil to a depth of 14 feet with minimal labor and minimal soil disturbance. TDR has been used for 10 years as a method for measuring soil moisture contents. Conventional TDR probes are 30 centimeters long and therefore are difficult to insert at depths below a few feet. Recently, a probe has been developed which can be inserted to depths of 14 feet with the use of a vibratory drill. Quality objectives for the instrument, preliminary data, and suggestions for future developments are presented.

  12. A new probe for in situ TDR moisture measurement

    International Nuclear Information System (INIS)

    Yokuda, E.; Smith, R.

    1993-01-01

    This paper explains the development of a new Time Domain Reflectometry (TDR) probe which can be inserted through waste and soil to a depth of 14 feet with minimal labor and minimal soil disturbance. TDR has been used for 10 years as a method for measuring soil moisture contents. Conventional TDR probes are 30 centimeters long and therefore are difficult to insert at depths below a few feet. Recently, a probe has been developed which can be inserted to depths of 14 feet with the use of a vibratory drill. Quality objectives for the instrument, preliminary data, and suggestions for future developments are presented

  13. A new probe for in situ TDR moisture measurement

    Energy Technology Data Exchange (ETDEWEB)

    Yokuda, E. [EG and G Idaho, Inc., Idaho Falls, ID (United States); Smith, R. [Sonsub Services, Inc., Houston, TX (United States)

    1993-05-01

    This paper explains the development of a new Time Domain Reflectometry (TDR) probe which can be inserted through waste and soil to a depth of 14 feet with minimal labor and minimal soil disturbance. TDR has been used for 10 years as a method for measuring soil moisture contents. Conventional TDR probes are 30 centimeters long and therefore are difficult to insert at depths below a few feet. Recently, a probe has been developed which can be inserted to depths of 14 feet with the use of a vibratory drill. Quality objectives for the instrument, preliminary data, and suggestions for future developments are presented.

  14. Proposta de arquitetura de hardware e software para sistemas tempo-real distribuídos

    OpenAIRE

    Marcelo Gotz

    2001-01-01

    Um sistema tempo-real caracteriza-se por possuir requisitos temporais para execução de suas atividades, e de acordo com a sua tolerância ao atendimento destes requisitos é classificado em hard-real-time ou soft-real-time. O presente trabalho se propõe a apresentar uma arquitetura de hardware e software para suporte a sistemas tempo-real embarcados de baixo custo com objetivo de aplicação em pesquisas no meio acadêmico e que possa ser usado até em ambientes hard-real-time. A motivação para est...

  15. Estrategias para establecer pastos de temporal en zonas semiáridas de México.

    OpenAIRE

    Hernández Guzmán, Filogonio Jesús

    2013-01-01

    Para incrementar la probabilidad de establecimiento de pastos, en siembras de temporal en zonas semiáridas, se caracterizaron física y fisiológicamente semillas de Banderita, Navajita; Buffel y Rhodes y, en base a dimensiones y utilizando tamiz, se clasificaron por tamaño de cariópside (TC) en chicos (Cch), medianos (CM) y grandes (CG). En Banderita y Buffel, los diámetros de tamiz para CG, CM y Cch fueron de 0.70, 0.59 y 0.50 mm y para Navajita y Rhodes, 0.59, 0.50 y 0.42 mm, respectivamente...

  16. Nucleo multiprocessado para aplicações em tempo-real

    OpenAIRE

    Roberto Andre Hexsel

    1988-01-01

    Resumo: Esta Dissertação descreve o nucleo de tempo-real do Multiprocessador para Sistemas de Controle (MSC). O MSC foi desenvolvido no Instituto de Automação do Centro Tecnológico para Informática e possui características que o tornam adequado a aplicações em controle de processos e automação industrial. Estas aplicações exigem respostas rápidas a eventos externos e grande capacidade de processamento. O MSC pode ser configurado para satisfazer as mais diversas aplicações e diferentes níveis ...

  17. Estimation of water absorption coefficient using the TDR method

    Science.gov (United States)

    Suchorab, Zbigniew; Majerek, Dariusz; Brzyski, Przemysław; Sobczuk, Henryk; Raczkowski, Andrzej

    2017-07-01

    Moisture accumulation and transport in the building barriers is an important feature that influences building performance, causing serious exploitation problems as increased energy use, mold and bacteria growth, decrease of indoor air parameters that may lead to sick building syndrome (SBS). One of the parameters that is used to describe moisture characteristic of the material is water absorption coefficient being the measure of capillary behavior of the material as a function of time and the surface area of the specimen. As usual it is determined using gravimetric methods according to EN 1925:1999 standard. In this article we demonstrate the possibility of determination of water absorption coefficient of autoclaved aerated concrete (AAC) using the Time Domain Reflectometry (TDR) method. TDR is an electric technique that had been adopted from soil science and can be successfully used for real-time monitoring of moisture transport in building materials and envelopes. Data achieved using TDR readouts show high correlation with standard method of moisture absorptivity coefficient determination.

  18. Design and evaluation of a high sensitivity spiral TDR scour sensor

    Science.gov (United States)

    Gao, Quan; (Bill Yu, Xiong

    2015-08-01

    Bridge scour accounts for more than half of the reported bridge failures in the United States. Scour monitoring technology based on time domain reflectometry (TDR) features the advantages of being automatic and inexpensive. The senior author’s team has developed a few generations of a TDR bridge scour monitoring system, which have succeeded in both laboratory and field evaluations. In this study, an innovative spiral TDR sensor is proposed to further improve the sensitivity of the TDR sensor in scour detection. The spiral TDR sensor is made of a parallel copper wire waveguide wrapped around a mounting rod. By using a spiral path for the waveguide, the TDR sensor achieves higher sensitivity than the traditional straight TDR probes due to longer travel distance of the electromagnetic (EM) wave per unit length in the spiral probe versus traditional probe. The performance of the new TDR spiral scour sensor is validated by calibration with liquids with known dielectric constant and wet soils. Laboratory simulated scour-refilling experiments are performed to evaluate the performance of the new spiral probe in detecting the sediment-water interface and therefore the scour-refill process. The tests results indicate that scour depth variation of less than 2 cm can be easily detected by this new spiral sensor. A theory is developed based on the dielectric mixing model to simplify the TDR signal analyses for scour depth detection. The sediment layer thickness (directly related to scour depth) varies linearly with the square root of the bulk dielectric constant of the water-sediment mixture measured by the spiral TDR probe, which matches the results of theoretical prediction. The estimated sediment layer thickness and therefore scour depth from the spiral TDR sensor agrees very well with that by direct physical measurement. The spiral TDR sensor is four times more sensitive than a traditional straight TDR probe.

  19. Assessing the accuracy of TDR-based water leak detection system

    Directory of Open Access Journals (Sweden)

    S.M. Fatemi Aghda

    2018-03-01

    Full Text Available The use of TDR system to detect leakage locations in underground pipes has been developed in recent years. In this system, a bi-wire is installed in parallel with the underground pipes and is considered as a TDR sensor. This approach greatly covers the limitations arisen with using the traditional method of acoustic leak positioning. TDR based leak detection method is relatively accurate when the TDR sensor is in contact with water in just one point. Researchers have been working to improve the accuracy of this method in recent years.In this study, the ability of TDR method was evaluated in terms of the appearance of multi leakage points simultaneously. For this purpose, several laboratory tests were conducted. In these tests in order to simulate leakage points, the TDR sensor was put in contact with water at some points, then the number and the dimension of the simulated leakage points were gradually increased. The results showed that with the increase in the number and dimension of the leakage points, the error rate of the TDR-based water leak detection system increases.The authors tried, according to the results obtained from the laboratory tests, to develop a method to improve the accuracy of the TDR-based leak detection systems. To do that, they defined a few reference points on the TDR sensor. These points were created via increasing the distance between two conductors of TDR sensor and were easily identifiable in the TDR waveform. The tests were repeated again using the TDR sensor having reference points. In order to calculate the exact distance of the leakage point, the authors developed an equation in accordance to the reference points. A comparison between the results obtained from both tests (with and without reference points showed that using the method and equation developed by the authors can significantly improve the accuracy of positioning the leakage points. Keywords: Multiple leakage points, TDR, Reference points

  20. Assessing the accuracy of TDR-based water leak detection system

    Science.gov (United States)

    Fatemi Aghda, S. M.; GanjaliPour, K.; Nabiollahi, K.

    2018-03-01

    The use of TDR system to detect leakage locations in underground pipes has been developed in recent years. In this system, a bi-wire is installed in parallel with the underground pipes and is considered as a TDR sensor. This approach greatly covers the limitations arisen with using the traditional method of acoustic leak positioning. TDR based leak detection method is relatively accurate when the TDR sensor is in contact with water in just one point. Researchers have been working to improve the accuracy of this method in recent years. In this study, the ability of TDR method was evaluated in terms of the appearance of multi leakage points simultaneously. For this purpose, several laboratory tests were conducted. In these tests in order to simulate leakage points, the TDR sensor was put in contact with water at some points, then the number and the dimension of the simulated leakage points were gradually increased. The results showed that with the increase in the number and dimension of the leakage points, the error rate of the TDR-based water leak detection system increases. The authors tried, according to the results obtained from the laboratory tests, to develop a method to improve the accuracy of the TDR-based leak detection systems. To do that, they defined a few reference points on the TDR sensor. These points were created via increasing the distance between two conductors of TDR sensor and were easily identifiable in the TDR waveform. The tests were repeated again using the TDR sensor having reference points. In order to calculate the exact distance of the leakage point, the authors developed an equation in accordance to the reference points. A comparison between the results obtained from both tests (with and without reference points) showed that using the method and equation developed by the authors can significantly improve the accuracy of positioning the leakage points.

  1. Self-Sensing TDR with Micro-Strip Line

    Science.gov (United States)

    2015-06-11

    the CFRP plate is quasi-isotropic [0/+45/0/-45/90/+45 /0/-45/90]S. The material used to fabricate the CFRP laminate is Toray T800S/3900-2B prepreg ...specimen. The specimen is 1750 mm long, 200 mm wide and is 2.6 mm thick. The material used to fabricate the CFRP laminate is Toray T800S/epoxy prepreg ...is adopted. In the present project, CFRP laminated plates are adopted as a target structure for application of self-sensing TDR. The previous

  2. Design and testing of access-tube TDR soil water sensor

    Science.gov (United States)

    We developed the design of a waveguide on the exterior of an access tube for use in time-domain reflectometry (TDR) for in-situ soil water content sensing. In order to optimize the design with respect to sampling volume and losses, we derived the electromagnetic (EM) fields produced by a TDR sensor...

  3. Estimation of water percolation by different methods using TDR

    Directory of Open Access Journals (Sweden)

    Alisson Jadavi Pereira da Silva

    2014-02-01

    Full Text Available Detailed knowledge on water percolation into the soil in irrigated areas is fundamental for solving problems of drainage, pollution and the recharge of underground aquifers. The aim of this study was to evaluate the percolation estimated by time-domain-reflectometry (TDR in a drainage lysimeter. We used Darcy's law with K(θ functions determined by field and laboratory methods and by the change in water storage in the soil profile at 16 points of moisture measurement at different time intervals. A sandy clay soil was saturated and covered with plastic sheet to prevent evaporation and an internal drainage trial in a drainage lysimeter was installed. The relationship between the observed and estimated percolation values was evaluated by linear regression analysis. The results suggest that percolation in the field or laboratory can be estimated based on continuous monitoring with TDR, and at short time intervals, of the variations in soil water storage. The precision and accuracy of this approach are similar to those of the lysimeter and it has advantages over the other evaluated methods, of which the most relevant are the possibility of estimating percolation in short time intervals and exemption from the predetermination of soil hydraulic properties such as water retention and hydraulic conductivity. The estimates obtained by the Darcy-Buckingham equation for percolation levels using function K(θ predicted by the method of Hillel et al. (1972 provided compatible water percolation estimates with those obtained in the lysimeter at time intervals greater than 1 h. The methods of Libardi et al. (1980, Sisson et al. (1980 and van Genuchten (1980 underestimated water percolation.

  4. Sampling and TDR probe insertion in the determination of the volumetric soil water content Procedimentos de amostragem e do modo de inserção no solo de sondas TDR na determinação da umidade volumétrica do solo

    Directory of Open Access Journals (Sweden)

    W. G. Teixeira

    2003-08-01

    üentemente, preferido. As principais desvantagens deste método são: a grande demanda de trabalho para a amostragem do solo e os procedimentos posteriores no laboratório, uma vez que, por ser um método destrutivo, não permite reamostrar o mesmo local posteriormente. Ultimamente, a técnica da reflectometria no domínio do tempo (TDR vem sendo amplamente usada como um método indireto não-destrutivo para avaliação de teta. Neste estudo, avaliações do número dielétrico aparente do solo (épsilon e amostragens para determinação gravimétrica da umidade do solo (tetaGrav foram realizadas em quatro locais em um Latossolo Amarelo em Manaus - Brasil. Com os valores de épsilon obtidos foi estimada, por meio de equações de calibração, a umidade volumétrica do solo pela técnica do TDR (tetaTDR, e então comparadas com as tetaGrav oriundas de amostras indeformadas e deformadas. Este estudo objetivou comparar valores de tetaGrav determinados com amostras deformadas e indeformadas com os valores de tetaTDR estimados tanto com a sonda introduzida horizontalmente quanto verticalmente no solo. Resultados comprovaram a ausência de diferenças significativas entre a estimativa de tetaTDR, quando a sonda foi colocada verticalmente no solo, e a média aritmética das camadas avaliadas pela sonda introduzida horizontalmente. Foram encontradas diferenças significativas nas determinações gravimétricas entre amostras indeformadas e deformadas. O uso do modelo de Knight et al. para avaliação do volume de solo pela técnica TDR foi também discutido. A técnica TDR, quando apropriadamente calibrada, permitiu a determinação de teta, in situ, em Latossolo Amarelo textura argilosa, com resultados similares aos do método gravimétrico.

  5. A reevaluation of TDR propagation time determination in soils and geological media

    Science.gov (United States)

    Time domain reflectometry (TDR) is an established method for the determination of apparent dielectric permittivity and water content in soils. Using current waveform interpretation procedures, signal attenuation and variation in dielectric media properties along the transmission line can significant...

  6. BASE Temperature Data Record (TDR) from the SSM/I and SSMIS Sensors, CSU Version 1

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The BASE Temperature Data Record (TDR) dataset from Colorado State University (CSU) is a collection of the raw unprocessed antenna temperature data that has been...

  7. NEXT-100 Technical Design Report (TDR). Executive summary

    International Nuclear Information System (INIS)

    Álvarez, V; Cárcel, S; Cervera, A; Díaz, J; Ferrario, P; Borges, F I G M; Conde, C A N; Dias, T H V T; Fernandes, L M P; Carmona, J M; Castel, J; Cebrián, S; Dafni, T; Catalá, J M; Esteve, R; Chan, D; Egorov, M; Evtoukhovitch, P; Ferreira, A L; Ferrer-Ribas, E

    2012-01-01

    In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (ββ0ν) in 136 XE at the Laboratorio Subterráneo de Canfranc (LSC), in Spain. The document formalizes the design presented in our Conceptual Design Report (CDR): an electroluminescence time projection chamber, with separate readout planes for calorimetry and tracking, located, respectively, behind cathode and anode. The detector is designed to hold a maximum of about 150 kg of xenon at 15 bar, or 100 kg at 10 bar. This option builds in the capability to increase the total isotope mass by 50% while keeping the operating pressure at a manageable level. The readout plane performing the energy measurement is composed of Hamamatsu R11410-10 photomultipliers, specially designed for operation in low-background, xenon-based detectors. Each individual PMT will be isolated from the gas by an individual, pressure resistant enclosure and will be coupled to the sensitive volume through a sapphire window. The tracking plane consists in an array of Hamamatsu S10362-11-050P MPPCs used as tracking pixels. They will be arranged in square boards holding 64 sensors (8 × 8) with a 1-cm pitch. The inner walls of the TPC, the sapphire windows and the boards holding the MPPCs will be coated with tetraphenyl butadiene (TPB), a wavelength shifter, to improve the light collection.

  8. NEXT-100 Technical Design Report (TDR). Executive summary

    Science.gov (United States)

    Álvarez, V.; Borges, F. I. G. M.; Cárcel, S.; Carmona, J. M.; Castel, J.; Catalá, J. M.; Cebrián, S.; Cervera, A.; Chan, D.; Conde, C. A. N.; Dafni, T.; Dias, T. H. V. T.; Díaz, J.; Egorov, M.; Esteve, R.; Evtoukhovitch, P.; Fernandes, L. M. P.; Ferrario, P.; Ferreira, A. L.; Ferrer-Ribas, E.; Freitas, E. D. C.; Gehman, V. M.; Gil, A.; Giomataris, I.; Goldschmidt, A.; Gómez, H.; Gómez-Cadenas, J. J.; González, K.; González-Díaz, D.; Gutiérrez, R. M.; Hauptman, J.; Hernando Morata, J. A.; Herrera, D. C.; Herrero, V.; Iguaz, F. J.; Irastorza, I. G.; Kalinnikov, V.; Kiang, D.; Labarga, L.; Liubarsky, I.; Lopes, J. A. M.; Lorca, D.; Losada, M.; Luzón, G.; Marí, A.; Martín-Albo, J.; Martínez, A.; Miller, T.; Moiseenko, A.; Monrabal, F.; Monteiro, C. M. B.; Monzó, J. M.; Mora, F. J.; Moutinho, L. M.; Muñoz Vidal, J.; Natal da Luz, H.; Navarro, G.; Nebot, M.; Nygren, D.; Oliveira, C. A. B.; Palma, R.; Pérez, J.; Pérez Aparicio, J. L.; Renner, J.; Ripoll, L.; Rodríguez, A.; Rodríguez, J.; Santos, F. P.; dos Santos, J. M. F.; Segui, L.; Serra, L.; Shuman, D.; Sofka, C.; Sorel, M.; Toledo, J. F.; Tomás, A.; Torrent, J.; Tsamalaidze, Z.; Vázquez, D.; Velicheva, E.; Veloso, J. F. C. A.; Villar, J. A.; Webb, R. C.; Weber, T.; White, J.; Yahlali, N.

    2012-06-01

    In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (ββ0ν) in 136XE at the Laboratorio Subterráneo de Canfranc (LSC), in Spain. The document formalizes the design presented in our Conceptual Design Report (CDR): an electroluminescence time projection chamber, with separate readout planes for calorimetry and tracking, located, respectively, behind cathode and anode. The detector is designed to hold a maximum of about 150 kg of xenon at 15 bar, or 100 kg at 10 bar. This option builds in the capability to increase the total isotope mass by 50% while keeping the operating pressure at a manageable level. The readout plane performing the energy measurement is composed of Hamamatsu R11410-10 photomultipliers, specially designed for operation in low-background, xenon-based detectors. Each individual PMT will be isolated from the gas by an individual, pressure resistant enclosure and will be coupled to the sensitive volume through a sapphire window. The tracking plane consists in an array of Hamamatsu S10362-11-050P MPPCs used as tracking pixels. They will be arranged in square boards holding 64 sensors (8 × 8) with a 1-cm pitch. The inner walls of the TPC, the sapphire windows and the boards holding the MPPCs will be coated with tetraphenyl butadiene (TPB), a wavelength shifter, to improve the light collection.

  9. NEXT-100 Technical Design Report (TDR). Executive Summary

    CERN Document Server

    ,

    2012-01-01

    In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay in Xe-136. The document formalizes the ANGEL design presented in our Conceptual Design Report (CDR). The baseline detector is designed to hold a maximum of about 150 kg of xenon at 15 bar, or 100 kg at 10 bar. This option builds in the capability to increase the total isotope mass by 50% while keeping the operating pressure at a manageable level. The ANGEL design calls for an asymmetric TPC, with photomultipliers behind a transparent cathode and position-sensitive light pixels behind the anode. We have chosen the low background R11410-10 PMTs for energy and timing and Hamamatsu MPPCs (S10362-11-050P model) as tracking pixels. Each individual PMT will be isolated from the gas by an individual, pressure resistant enclosure and will be coupled to the sensitive volume through a sapphire window coated with terphenyl-butadiene (TPB) . MPPCs will be arranged in Dice Boards (DB) holding 64 senso...

  10. Monitoring slope movement using time domain reflectometry (TDR) technology and early warning system

    International Nuclear Information System (INIS)

    Wan Zakaria Wan Muhamad Tahir, Lakam Mejus; Johari Abd Latif

    2006-01-01

    Many options of electronic instrumentation are available for monitoring unstable and/or potentially unstable slopes. One of the tools is applying TDR technology which is now regarded as a cost effective and alternative means for locating the depth to a shear plane or zone in a landslide. TDR uses an electronic voltage pulse that is reflected like radar from a damaged or deformed location in a coaxial cable. To monitor slope movement, coaxial cables are grouted in boreholes and interrogated using a TDR cable tester, which is attached to a programmed data logger. Characteristic cable signatures can be stored and compared over time for any changes indicating slope movement. This paper describes a case study documenting TDR installation procedure, data acquisition system and on-site TDR data collection of an unstable hill slope in Kampong Bharu -Bukit Tinggi, Bentong. A possibility of using a remotely automated monitoring system (advanced telemetry and data logger) that can incorporate with other types of sensors (e.g. rain gauge, vibrating wire piezometer, in-place inclinometer) together with many TDR sensor cables as an integrated package for early-warning of potential unstable slope movement around the area was highlighted and proposed. (Author)

  11. Profiling water content in soils with TDR: Comparison with the neutron probe technique

    International Nuclear Information System (INIS)

    Laurent, J.P.

    2000-01-01

    In November 1996, at a site on the Grenoble campus a 1.2-m-long neutron access tube, a 0.8-m fibreglass Trime access tube and three sets of 1-m twin-rod TDR probes were installed. Weekly measurements were made over a 9-month period. In addition, soil samples were taken from time to time with an auger, to determine gravimetric water-contents. The soil bulk density profile was initially characterised by gammametry using a Campbell TM probe. A Troxler TM 4300 was used for the neutron-probe measurements. The TDR signals, for further processing by TDR-SSI, were logged using a Trase 2000 from Soil Moisture Equipment Corporation TM . TDR methods were employed without any special calibration of the permittivity/water-content relationship: standard internal calibrations of the devices or Topp polynomial relation were always applied. The results of all these water-content profiling methods were compared in three ways: (i) the water-content profiles were plotted directly on the same graph for different dates; (ii) all the water contents measured at all dates and all depths were plotted against a corresponding 'reference', namely neutron probe or gravimetry; (iii) water balances were calculated for each method and their respective time-profiles analysed. There was fairly good agreement among the three profiling methods, indicating that TDR is now a viable alternative to nuclear techniques for soil water-content profiling. (author)

  12. Effect of Roots on Infiltration Process around a Tree - an Application of Tension-TDR Probes

    Science.gov (United States)

    -Lun Li, Sheng; Liang, Wei-Li

    2014-05-01

    The infiltration processe around a tree is usually complex because of preferential pathways around roots. In order to clarify the effect of tree roots on the infiltration process, we simultaneously measured volumetric water content (θ) and metric potential (ψ) with a high-density installation of Tensio-TDR probes, which could provid in situ soil-water characteristic curves in a small area around tree roots. A tension-TDR probe includes a coiled time domain reflectometry (TDR) probe around the porous cup of a standard tensiometer. The investigation was carried out around a Taiwanese cedar (Taiwania cryptomerioides) in a mixed coniferous forested stand. There were 24 soil moisture sensors and 12 Tensio-TDR probes installed in different depths of two soil profiles, respectively. The result suggested that the Tensio-TDR probe is better to determine the occurrence of preferential flow around tree roots than soil moisture sensors. Woody roots promoted the occurrence of lateral flows and caused rapid increases of θ in the deeper soil layers. Soil porosity was high in the area with fine roots where infiltration was dominated by vertical flows. We also compared the difference betweenthe field and laboratory soil-water characteristic curves, which were determined by the θ and ψ datasets from the field and the measurement using pressure plate method in a laboratory, respectively.

  13. Seasonal variations measured by TDR and GPR on an anthropogenic sandy soil and the implications for utility detection

    Science.gov (United States)

    Curioni, Giulio; Chapman, David N.; Metje, Nicole

    2017-06-01

    The electromagnetic (EM) soil properties are dynamic variables that can change considerably over time, and they fundamentally affect the performance of Ground Penetrating Radar (GPR). However, long-term field studies are remarkably rare and records of the EM soil properties and their seasonal variation are largely absent from the literature. This research explores the extent of the seasonal variation of the apparent permittivity (Ka) and bulk electrical conductivity (BEC) measured by Time Domain Reflectometry (TDR) and their impact on GPR results, with a particularly important application to utility detection. A bespoke TDR field monitoring station was specifically developed and installed in an anthropogenic sandy soil in the UK for 22 months. The relationship between the temporal variation of the EM soil properties and GPR performance has been qualitatively assessed, highlighting notably degradation of the GPR images during wet periods and a few days after significant rainfall events following dry periods. Significantly, it was shown that by assuming arbitrary average values (i.e. not extreme values) of Ka and BEC which do not often reflect the typical conditions of the soil, it can lead to significant inaccuracies in the estimation of the depth of buried targets, with errors potentially up to approximately 30% even over a depth of 0.50 m (where GPR is expected to be most accurate). It is therefore recommended to measure or assess the soil conditions during GPR surveys, and if this is not possible to use typical wet and dry Ka values reported in the literature for the soil expected at the site, to improve confidence in estimations of target depths.

  14. Efficient reconstruction of dispersive dielectric profiles using time domain reflectometry (TDR

    Directory of Open Access Journals (Sweden)

    P. Leidenberger

    2006-01-01

    Full Text Available We present a numerical model for time domain reflectometry (TDR signal propagation in dispersive dielectric materials. The numerical probe model is terminated with a parallel circuit, consisting of an ohmic resistor and an ideal capacitance. We derive analytical approximations for the capacitance, the inductance and the conductance of three-wire probes. We couple the time domain model with global optimization in order to reconstruct water content profiles from TDR traces. For efficiently solving the inverse problem we use genetic algorithms combined with a hierarchical parameterization. We investigate the performance of the method by reconstructing synthetically generated profiles. The algorithm is then applied to retrieve dielectric profiles from TDR traces measured in the field. We succeed in reconstructing dielectric and ohmic profiles where conventional methods, based on travel time extraction, fail.

  15. Áreas potenciales para el cultivo de girasol en condiciones de temporal en Guanajuato, México

    Directory of Open Access Journals (Sweden)

    Enrique López-Rocha

    2018-05-01

    Full Text Available En los últimos cinco años en México se registró un incremento de 189,50 a 13 219,84 hectáreas, en la superficie de cultivo de girasol en temporal, particularmente en el estado de Guanajuato se sembró aproximadamente 450 hectáreas en 2016. Esta forma de cultivo requiere de planeación que contemple variables bioclimáticas para el óptimo desarrollo y rendimiento. El objetivo del presente trabajo fue determinar las áreas con potencial bioclimático para el establecimiento del cultivo de girasol en temporal en el estado de Guanajuato. Durante el ciclo otoño-invierno del 2016 se monitorearon y se estratificaron 45 parcelas de girasol, distribuidas en once municipios, en las que se registró el rendimiento asociado a temperatura máxima y mínima, humedad relativa, radiación solar, precipitación y evapotranspiración. Los datos de parcelas con un rendimiento mayor a 1,89 t/ha se utilizaron para generar polígonos con una saturación de 56 puntos de abundancia, para calcular la distribución potencial mediante el programa Maxent, con 23 variables bioclimáticas como predictores. Las variables con mayor contribución porcentual a la distribución potencial fueron: temperatura promedio del cuatrimestre más seco, altitud, régimen de humedad y perfil edáfico. Las áreas potenciales para el establecimiento del cultivo suman una superficie total de 317 028 hectáreas, donde el clima predominante es semicálido subhúmedo, temperatura media anual de 20 °C, precipitación media anual de 600 a 800 mm y una altitud de 500 a 1500 msnm.

  16. High-resolution moisture profiles from full-waveform probabilistic inversion of TDR signals

    Science.gov (United States)

    Laloy, Eric; Huisman, Johan Alexander; Jacques, Diederik

    2014-11-01

    This study presents an novel Bayesian inversion scheme for high-dimensional undetermined TDR waveform inversion. The methodology quantifies uncertainty in the moisture content distribution, using a Gaussian Markov random field (GMRF) prior as regularization operator. A spatial resolution of 1 cm along a 70-cm long TDR probe is considered for the inferred moisture content. Numerical testing shows that the proposed inversion approach works very well in case of a perfect model and Gaussian measurement errors. Real-world application results are generally satisfying. For a series of TDR measurements made during imbibition and evaporation from a laboratory soil column, the average root-mean-square error (RMSE) between maximum a posteriori (MAP) moisture distribution and reference TDR measurements is 0.04 cm3 cm-3. This RMSE value reduces to less than 0.02 cm3 cm-3 for a field application in a podzol soil. The observed model-data discrepancies are primarily due to model inadequacy, such as our simplified modeling of the bulk soil electrical conductivity profile. Among the important issues that should be addressed in future work are the explicit inference of the soil electrical conductivity profile along with the other sampled variables, the modeling of the temperature-dependence of the coaxial cable properties and the definition of an appropriate statistical model of the residual errors.

  17. Metrological assessment of TDR performance for measurement of potassium concentration in soil solution

    Directory of Open Access Journals (Sweden)

    Isaac de M. Ponciano

    2016-04-01

    Full Text Available ABSTRACT Despite the growing use of the time domain reflectometry (TDR technique to monitoring ions in the soil solution, there are few studies that provide insight into measurement error. To overcome this lack of information, a methodology, based on the central limit theorem error, was used to quantify the uncertainty associated with using the technique to estimate potassium ion concentration in two soil types. Mathematical models based on electrical conductivity and soil moisture derived from TDR readings were used to estimate potassium concentration, and the results were compared to potassium concentration determined by flame spectrophotometry. It was possible to correct for random and systematic errors associated with TDR readings, significantly increasing the accuracy of the potassium estimation methodology. However, a single TDR reading can lead to an error of up to ± 18.84 mg L-1 K+ in soil solution (0 to 3 dS m-1, with a 95.42% degree of confidence, for a loamy sand soil; and an error of up to ± 12.50 mg L-1 of K+ (0 to 2.5 dS m-1 in soil solution, with a 95.06% degree of confidence, for a sandy clay soil.

  18. Accuracy improvement in the TDR-based localization of water leaks

    Directory of Open Access Journals (Sweden)

    Andrea Cataldo

    Full Text Available A time domain reflectometry (TDR-based system for the localization of water leaks has been recently developed by the authors. This system, which employs wire-like sensing elements to be installed along the underground pipes, has proven immune to the limitations that affect the traditional, acoustic leak-detection systems.Starting from the positive results obtained thus far, in this work, an improvement of this TDR-based system is proposed. More specifically, the possibility of employing a low-cost, water-absorbing sponge to be placed around the sensing element for enhancing the accuracy in the localization of the leak is addressed.To this purpose, laboratory experiments were carried out mimicking a water leakage condition, and two sensing elements (one embedded in a sponge and one without sponge were comparatively used to identify the position of the leak through TDR measurements. Results showed that, thanks to the water retention capability of the sponge (which maintains the leaked water more localized, the sensing element embedded in the sponge leads to a higher accuracy in the evaluation of the position of the leak. Keywords: Leak localization, TDR, Time domain reflectometry, Water leaks, Underground water pipes

  19. The TDR: A Repository for Long Term Storage of Geophysical Data and Metadata

    Science.gov (United States)

    Wilson, A.; Baltzer, T.; Caron, J.

    2006-12-01

    For many years Unidata has provided easy, low cost data access to universities and research labs. Historically Unidata technology provided access to data in near real time. In recent years Unidata has additionally turned to providing middleware to serve longer term data and associated metadata via its THREDDS technology, the most recent offering being the THREDDS Data Server (TDS). The TDS provides middleware for metadata access and management, OPeNDAP data access, and integration with the Unidata Integrated Data Viewer (IDV), among other benefits. The TDS was designed to support rolling archives of data, that is, data that exist only for a relatively short, predefined time window. Now we are creating an addition to the TDS, called the THREDDS Data Repository (TDR), which allows users to store and retrieve data and other objects for an arbitrarily long time period. Data in the TDR can also be served by the TDS. The TDR performs important functions of locating storage for the data, moving the data to and from the repository, assigning unique identifiers, and generating metadata. The TDR framework supports pluggable components that allow tailoring an implementation for a particular application. The Linked Environments for Atmospheric Discovery (LEAD) project provides an excellent use case for the TDR. LEAD is a multi-institutional Large Information Technology Research project funded by the National Science Foundation (NSF). The goal of LEAD is to create a framework based on Grid and Web Services to support mesoscale meteorology research and education. This includes capabilities such as launching forecast models, mining data for meteorological phenomena, and dynamic workflows that are automatically reconfigurable in response to changing weather. LEAD presents unique challenges in managing and storing large data volumes from real-time observational systems as well as data that are dynamically created during the execution of adaptive workflows. For example, in order to

  20. Sniffer para redes Ethernet de tempo-real baseado em FPGA

    OpenAIRE

    Faria, João Pedro Puga

    2008-01-01

    A crescente utilização de sistemas distribuídos em aplicações de tempo-real tem levado á criação de protocolos de comunicação cada vez mais com- plexos e sofisticados. Apesar da rede Ethernet não apresentar característi- cas de tempo-real, devido ás suas vantagens, têm sido desenvolvidos muitos protocolos de comunicação tempo-real baseados em Ethernet. Nesta disser- tação é analisada a importância das arquitecturas distribuídas em aplicações de tempo-real, sendo apresentados...

  1. A scientometric evaluation of the Chagas disease implementation research programme of the PAHO and TDR.

    Directory of Open Access Journals (Sweden)

    Ana Laura Carbajal-de-la-Fuente

    2013-11-01

    Full Text Available The Special Programme for Research and Training in Tropical Diseases (TDR is an independent global programme of scientific collaboration cosponsored by the United Nations Children's Fund, the United Nations Development Program, the World Bank, and the World Health Organization. TDR's strategy is based on stewardship for research on infectious diseases of poverty, empowerment of endemic countries, research on neglected priority needs, and the promotion of scientific collaboration influencing global efforts to combat major tropical diseases. In 2001, in view of the achievements obtained in the reduction of transmission of Chagas disease through the Southern Cone Initiative and the improvement in Chagas disease control activities in some countries of the Andean and the Central American Initiatives, TDR transferred the Chagas Disease Implementation Research Programme (CIRP to the Communicable Diseases Unit of the Pan American Health Organization (CD/PAHO. This paper presents a scientometric evaluation of the 73 projects from 18 Latin American and European countries that were granted by CIRP/PAHO/TDR between 1997 and 2007. We analyzed all final reports of the funded projects and scientific publications, technical reports, and human resource training activities derived from them. Results about the number of projects funded, countries and institutions involved, gender analysis, number of published papers in indexed scientific journals, main topics funded, patents inscribed, and triatomine species studied are presented and discussed. The results indicate that CIRP/PAHO/TDR initiative has contributed significantly, over the 1997-2007 period, to Chagas disease knowledge as well as to the individual and institutional-building capacity.

  2. TDR water content inverse profiling in layered soils during infiltration and evaporation

    Science.gov (United States)

    Greco, R.; Guida, A.

    2009-04-01

    During the last three decades, time domain reflectometry (TDR) has become one of the most commonly used tools for soil water content measurements either in laboratory or in the field. Indeed, TDR provides easy and cheap water content estimations with relatively small disturbance to the investigated soil. TDR measurements of soil water content are based on the strong correlation between relative dielectric permittivity of wet soil and its volumetric water content. Several expressions of the relationship between relative dielectric permittivity and volumetric water content have been proposed, empirically stated (Topp et al., 1980) as well as based on semi-analytical approach to dielectric mixing models (Roth et al., 1990; Whalley, 1993). So far, TDR field applications suffered the limitation due to the capability of the technique of estimating only the mean water content in the volume investigated by the probe. Whereas the knowledge of non homogeneous vertical water content profiles was needed, it was necessary to install either several vertical probes of different length or several horizontal probes placed in the soil at different depths, in both cases strongly increasing soil disturbance as well as the complexity of the measurements. Several studies have been recently dedicated to the development of inversion methods aimed to extract more information from TDR waveforms, in order to estimate non homogeneous moisture profiles along the axis of the metallic probe used for TDR measurements. A common feature of all these methods is that electromagnetic transient through the wet soil along the probe is mathematically modelled, assuming that the unknown soil water content distribution corresponds to the best agreement between simulated and measured waveforms. In some cases the soil is modelled as a series of small layers with different dielectric properties, and the waveform is obtained as the result of the superposition of multiple reflections arising from impedance

  3. BrAgriNews: Um Corpus Temporal-Causal (Português-Brasileiro para a Agricultura

    Directory of Open Access Journals (Sweden)

    Brett Drury

    2017-07-01

    Full Text Available Recentemente tem havido um aumento no interesse, tanto no meio acadêmico quanto na indústria, em aplicações de aprendizagem de máquina e técnicas de inteligência artificial relacionadas com problemas agrícolas. Mineração de texto e técnicas relacionadas com o processamento da língua natural, raramente foram usadas para resolver problemas agrícolas, e muito menos para a língua portuguesa. É possível que um dos fatores que influenciam a escassez no uso técnicas de mineração de texto, para analisar textos em português e resolver problemas agrícolas, pode ser devido à falta de um corpus anotado livremente disponível. Para colmatar a falta de um corpus agrícola em língua portuguesa, estamos liberando um recurso em português-brasileiro voltado para agricultura, descrito neste artigo. O corpus abrange um período parcialmente contínuo de tempo entre 1996 e 2016, consistindo de notícias em português-brasileiro que foram anotadas com o seguinte tipo de informação: causal, sentimento, entidades nomeadas que incluem expressões temporais. O corpus tem recursos adicionais como: treebank, listas de termos frequentes (sem stop-words: unigramas, bigramas e trigramas, bem como palavras ou frases que foram identificados por jornalistas como de domínio específico. Espera-se que a liberação do corpus estimule a adoção da mineração de texto na agricultura na comunidade de pesquisa lusófona.

  4. A Model-Based Probabilistic Inversion Framework for Wire Fault Detection Using TDR

    Science.gov (United States)

    Schuet, Stefan R.; Timucin, Dogan A.; Wheeler, Kevin R.

    2010-01-01

    Time-domain reflectometry (TDR) is one of the standard methods for diagnosing faults in electrical wiring and interconnect systems, with a long-standing history focused mainly on hardware development of both high-fidelity systems for laboratory use and portable hand-held devices for field deployment. While these devices can easily assess distance to hard faults such as sustained opens or shorts, their ability to assess subtle but important degradation such as chafing remains an open question. This paper presents a unified framework for TDR-based chafing fault detection in lossy coaxial cables by combining an S-parameter based forward modeling approach with a probabilistic (Bayesian) inference algorithm. Results are presented for the estimation of nominal and faulty cable parameters from laboratory data.

  5. Use of a combined penetrometer-TDR moisture probe for soil compaction studies

    International Nuclear Information System (INIS)

    Pedro Vaz, C.M.

    2004-01-01

    measurement technique, we have developed a combined cone penetrometer-TDR moisture probe by wrapping two TDR wires around the penetrometer rod (combined rod TDR) as a double helix, so that both soil water content and penetration resistance can be measured simultaneously and at approximately the same location within the soil profile. The main advantage of the coiled design is that relative long travel times can be obtained, allowing accurate water content measurements for small-sized TDR probes. The objective of this lecture is to present the combined penetrometer-TDR probe as a new tool to study soil compaction. The presentation will cover the following topics: Theory of the dynamic cone penetrometer; Laboratory calibration of a coiled TDR moisture probe and application of the mixing model; Field calibration and use of the combined penetrometer-coiled TDR moisture probe; Penetration resistance, bulk density, water content and potential relationships; Practical applications of the combined penetrometer-coiled TDR moisture probe

  6. Plant GSK3 proteins regulate xylem cell differentiation downstream of TDIF-TDR signalling

    Science.gov (United States)

    Kondo, Yuki; Ito, Tasuku; Nakagami, Hirofumi; Hirakawa, Yuki; Saito, Masato; Tamaki, Takayuki; Shirasu, Ken; Fukuda, Hiroo

    2014-03-01

    During plant radial growth typically seen in trees, procambial and cambial cells act as meristematic cells in the vascular system to self-proliferate and differentiate into xylem cells. These two processes are regulated by a signalling pathway composed of a peptide ligand and its receptor; tracheary element differentiation inhibitory factor (TDIF) and TDIF RECEPTOR (TDR). Here we show that glycogen synthase kinase 3 proteins (GSK3s) are crucial downstream components of the TDIF signalling pathway suppressing xylem differentiation from procambial cells. TDR interacts with GSK3s at the plasma membrane and activates GSK3s in a TDIF-dependent fashion. Consistently, a specific inhibitor of plant GSK3s strongly induces xylem cell differentiation through BRI1-EMS SUPPRESSOR 1 (BES1), a well-known target transcription factor of GSK3s. Our findings provide insight into the regulation of cell fate determination in meristem maintenance.

  7. Operadores para consultas relacionadas con reclasificaciones en un modelo temporal multidimensional

    Directory of Open Access Journals (Sweden)

    Francisco Moreno

    2011-01-01

    Full Text Available Usualmente las dimensiones de una bodega de datos son consideradas estáticas porque su esquema y datos tienden a no cambiar. Sin embargo, tanto el esquema como los datos de las dimensiones pueden cambiar. Este artículo se enfoca en un tipo de cambio dimensional denominado reclasificación, que ocurre cuando un miembro de un nivel cambia de miembro en un nivel superior de la dimensión, ejemplo, cuando un producto cambia de categoría (es reclasificado. Este tipo de cambios da lugar al concepto período de clasificación y a un tipo de consultas que pueden ser útiles para la toma de decisiones. Verbigracia, ¿cuál fue el total vendido del producto ajedrez durante su primer periodo de clasificación en la categoría juguete? Para facilitar el planteamiento de este tipo de consultas se propone un conjunto de operadores y se muestra como éstos se incorporan en SQL, un lenguaje familiar para los desarrolladores de bases de datos. También se demuestra la expresividad de los operadores propuestos, ya que la formulación de esas consultas sin usar estos operadores usualmente conduce a soluciones complejas y poco intuitivas.

  8. Models for moisture estimation in different horizons of yellow argisol using TDR

    Directory of Open Access Journals (Sweden)

    Karla Silva Santos Alvares de Almeida

    2017-08-01

    Full Text Available The determination of soil moisture is very important because it is the property with the most influence on the dielectric constant of the medium. Time-domain reflectometry (TDR is an indirect technique used to estimate the water content of the soil (? based on its dielectric constant (Ka. Like any other technique, it has advantages and disadvantages. Among the major disadvantages is the need for calibration, which requires consideration of the soil characteristics. This study aimed to perform the calibration of a TDR100 device to estimate the volumetric water content of four horizons of a Yellow Argisol. Calibration was performed under laboratory conditions using disturbed soil samples contained in PVC columns. The three rods of the handcrafted probes were vertically installed in the soil columns. Weight measurements with digital scales and daily readings of the dielectric constant with the TDR device were taken. For all soil horizons evaluated, the best fits between the dielectric constant and the volumetric water content were related to the cubic polynomial model. The Ledieu model overestimated by approximately 68 % the volumetric water content in the A and AB horizons, and underestimating by 69 % in Bt2, in relation to volumetric water content obtained by gravimetry. The underestimation by linear, Topp, Roth, and Malicki models ranged from 50 % to 85 % for all horizons.

  9. Monitoring changes in soil water content on adjustable soil slopes of a soil column using time domain reflectometry (TDR) techniques

    International Nuclear Information System (INIS)

    Wan Zakaria Wan Muhd Tahir; Lakam Anak Mejus; Johari Abdul Latif

    2004-01-01

    Time Domain Reflectometry (TDR) is one of non-destructive methods and widely used in hydrology and soil science for accurate and flexible measurement of soil water content The TDR technique is based on measuring the dielectric constant of soil from the propagation of an electromagnetic pulse traveling along installed probe rods (parallel wire transmission line). An adjustable soil column i.e., 80 cm (L) x 35 cm (H) x 44 cm (W) instrumented with six pairs of vertically installed CS615 reflectometer probes (TDR rods) was developed and wetted under a laboratory simulated rainfall and their sub-surface moisture variations as the slope changes were monitored using TDR method Soil samples for gravimetric determination of water content, converted to a volume basis were taken at selected times and locations after the final TDR reading for every slope change made of the soil column Comparisons of water contents by TDR with those from grawmetric samples at different slopes of soil column were examined. The accuracy was found to be comparable and to some extent dependent upon the variability of the soil. This study also suggests that the response of slope (above 20 degrees) to the gradual increase in water content profile may cause soil saturation faster and increased overland flow (runoff especially on weak soil conditions

  10. Refugio temporal de bambú para casos de emergencia nacional

    OpenAIRE

    Carmiol, Virginia; Escoto-Montero, Alberto

    2007-01-01

    Proyecto de Investigación Este proyecto consistió en el desarrollo y construcción de un Refugio de Bambú, para albergar a los damnificados de nuestro país que pierden sus viviendas por causas naturales (inundaciones, deslizamientos, sismos). El Refugio debió cumplir con especificaciones técnicas que permitieran su construcción en las zonas afectadas del país. El fácil traslado del material, así como la rápida construcción del Refugio por personal no capacitado, fueron requer...

  11. Factores de Riesgo para Recurrencia de Convulsiones y Pronóstico a Corto Plazo en Cirugía de Epilepsia para Esclerosis Mesial Temporal.

    Directory of Open Access Journals (Sweden)

    Héctor Jaramillo Betancur

    2009-07-01

    Full Text Available

    Objetivo: Determinar los factores de riesgo para recurrencia de convulsiones y la clasificación posquirúrgica a corto plazo en pacientes operados por esclerosis mesial temporal (EMT.

    Métodos: Estudio de casos y controles anidado en la cohorte de pacientes con EMT diagnosticados por resonancia magnética con dos años de seguimiento posquirúrgico; se excluyeron pacientes con EMT bilateral. Se evaluaron características clínicas prequirúrgicas, foco epileptogénico en video-EEG y variables quirúrgicas con respecto a recurrencia de convulsiones en los primeros dos años posquirúrgicos y clasificación de Engel en el primer y segundo aniversario de la cirugía.

    Resultados: Entre octubre de 2001 y junio de 2008 se han evaluado 144 pacientes con EMT candidatos a cirugía de epilepsia; a junio de 2007, se han operado 89 pacientes, 51.7% con EMT izquierda. 35.8% de los pacientes presentaron recurrencia de convulsiones antes del segundo año posquirúrgico; el factor de riesgo prequirúrgico asociado a recurrencia fue foco bitemporal o temporal único con diseminación contralateral por video-EEG (OR: 6.32; IC95% 1.64-26.41, y posquirúrgico, la presencia de convulsiones durante el primer mes posoperatorio (p:0.0004; no se encontró asociación con recurrencia para: género, convulsiones tónico-clónicas generalizadas prequirúrgicas, lado de la EMT ni tiempo de evolución prequirúrgica de la epilepsia. 66.3% y 75.8% de los pacientes estaban en Engel I al primer y segundo aniversario de la cirugía, respectivamente. 91% de los pacientes intervenidos estaban en buen pronóstico posquirúrgico a los dos años.

    Conclusión: La localización del foco epileptogénico por electrofisiología es factor determinante en el pronóstico posquirúrgico a corto plazo en EMT.

    Palabras clave

    Cirugía de epilepsia, convulsiones, epilepsia del lóbulo temporal

  12. Auditoría médica concurrente de certificados de incapacidad temporal para el trabajo

    Directory of Open Access Journals (Sweden)

    Fernando Llanos Zavalaga

    2002-01-01

    Full Text Available La auditoría médica, busca identificar las irregularidades y disfunciones médicas y administrativa con miras a proponer alternativas que permitan mejorar la calidad. Objetivo: Identificar y analizar las causas de la emisión de los Certificados de Incapacidad Temporal para el Trabajo (CITT. Material y Métodos: El estudio se realizó en 17 centros asistenciales de EsSalud de Lima y Callao, en 1996. Se auditaron 41,918 CITT, excluyendo aquellos emitidos para descanso pre y post natal, y por los servicios médicos PAAD (Programa de Atención Ambulatoria y Domiciliaria. Se establecieron 8 criterios para determinar la adecuada emisión de los mismos. Resultados: Del total de CITT auditados 52.93% presentaron observaciones. La mayor parte de las observaciones fueron de tipo administrativo, las relacionadas a la práctica médica fueron escasas. Las observaciones más frecuentes fueron: "No estar registrado en la historia clínica" (45.46% de CITT observados, "No estar la consulta registrada en la historia clínica" (16.61% y "No coincidir la fecha registrada en la historia clínica con la fecha del CITT" (10.82%. Conclusiones: Muchos de los errores encontrados que justificaron la observación técnica de los CITT estaban relacionados con problemas administrativos, producto generalmente del llenado inadecuado de los documentos (historias clínicas y CITT. Se recomienda la implementación de un sistema autosostenible de auditoría concurrente, y diseños de programas de educación y capacitación en este tema. (Rev Med Hered 2002; 13: 26-31.

  13. Medida de la evapotranspiración real en coberturas vegetales semiáridas (Cuenca de Mula, Murcia), según las varicaciones de humedad del suelo medidas mediante el procedimiento (TDR)

    OpenAIRE

    Belmonte Serrato, Francisco; Romero Díaz, María Asunción

    2006-01-01

    En este trabajo se presenta un método de medida directa de la Evapotranspiración Real (ETR) bajo distintas coberturas vegetales, basado en las diferencias de humedad en el suelo medidas mediante el procedimiento TDR, en un intervalo temporal de 15 días y su comparación con los valores calculados mediante el método de Thornthwaite, que usa la temperatura media como parámetro fundamental. Los resultados demuestran la validez del método utilizado, habiendo obtenido valores de E...

  14. ANÁLISIS DE LA ESTABILIDAD ESPACIO-TEMPORAL DEL MÉTODO PETROV-GALERKIN EN CONTRACORRIENTE PARA LA ECUACIONES DE DIFUSIÓN-ADVECCIÓN

    Directory of Open Access Journals (Sweden)

    DIEGO GARZÓN

    2010-01-01

    Full Text Available El presente artículo analiza la estabilidad espacial y temporal de una solución numérica de la ecuación de difusiónadvección, a través del método de PetrovGalerkin en contracorriente (SUPG, junto con una discretización temporal BackwardEuler. En la primera parte del artículo se plantean los conceptos fundamentales de la técnica de estabilización espacial SUPG para dos dimensiones y posteriormente se presentan las consideraciones empleadas para la discretización temporal. A continuación se trata la metodología y las expresiones necesarias para la implementación computacional del método. Se analizan dos casos de estudio en los cuales se compara la estabilidad espacial y temporal de la solución implementada, con la obtenida por medio de la aproximación convencional BubnovGalerkin. Se emplea el error en norma de energía para analizar la estabilidad de las aproximaciones obtenidas. Videos y gráficas adicionales de los problemas presentados en este artículo pueden ser descargados de www.gnum.unal.edu.co

  15. Mobile TDR for geo-referenced measurement of soil water content and electrical conductivity

    DEFF Research Database (Denmark)

    Thomsen, Anton; Schelde, Kirsten; Drøscher, Per

    2007-01-01

    The development of site-specific crop management is constrained by the availability of sensors for monitoring important soil and crop related conditions. A mobile time-domain reflectometry (TDR) unit for geo-referenced soil measurements has been developed and used for detailed mapping of soil wat...... analysis of the soil water measurements, recommendations are made with respect to sampling strategies. Depending on the variability of a given area, between 15 and 30 ha can be mapped with respect to soil moisture and electrical conductivity with sufficient detail within 8 h...

  16. TDR measurements looking for complex dielectric permittivity and complex magnetic permeability in lossy materials

    Science.gov (United States)

    Persico, Raffaele

    2017-04-01

    TDR probes can be exploited for the measure of the electromagnetic characteristics of the soil, or of any penetrable material. They are commonly exploited as instruments for the measure of the propagation velocity of the electromagnetic waves in the probed medium [1], in its turn useful for the proper focusing of GPR data [2-5]. However, a more refined hardware and processing can allow to extrapolate from these probes also the discrimination between dielectric and magnetic characteristics of the material under test, which can be relevant for a better interpretation of the buried scenario or in order to infer physical-chemical characteristics of the material at hand. This requires a TDR probe that can work in frequency domain, and in particular that allows to retrieve the reflection coefficient at the air soil interface. It has been already shown [6] that in lossless cases this can be promising. In the present contribution, it will be shown at the EGU conference that it is possible to look for both the relative complex permittivity and the relative magnetic permeability of the probed material, on condition that the datum has an acceptable SNR and that some diversity of information is guaranteed, either by multifrequency data or by a TDR that can prolong its arms in the soil. References [1] F. Soldovieri, G. Prisco, R. Persico, Application of Microwave Tomography in Hydrogeophysics: some examples, Vadose Zone Journal, vol. 7, n. 1 pp. 160-170, Feb. 2008. [2] I. Catapano, L. Crocco, R. Persico, M. Pieraccini, F. Soldovieri, "Linear and Nonlinear Microwave Tomography Approaches for Subsurface Prospecting: Validation on Real Data", IEEE Trans. on Antennas and Wireless Propagation Letters, vol. 5, pp. 49-53, 2006. [3] G. Leucci, N. Masini, R. Persico, F. Soldovieri." GPR and sonic tomography for structural restoration : the case of the Cathedral of Tricarico", Journal of Geophysics and Engineering, vol. 8, pp. S76-S92, Aug. 2011. [4] S. Piscitelli, E. Rizzo, F. Cristallo

  17. Percepción del tiempo: resultados de una intervención grupal breve para el cambio del perfil temporal

    Directory of Open Access Journals (Sweden)

    Cristián Oyanadel

    2014-06-01

    Full Text Available La teoría de la perspectiva del tiempo de Zimbardo (1999 plantea una clasificación de las dimensiones de la orientación temporal, medidas con el Zimbardo Time Perspective Inventory (ZTPI, la cual propone, por una parte, que si se tiene una actitud positiva y moderada hacia el pasado, el presente y el futuro, se puede desarrollar mayor bienestar y buena salud tanto mental como física, mientras que actitudes negativas o extremas reflejarían pautas de vida poco saludables. El principal objetivo de esta investigación es evaluar el efecto de una intervención grupal breve para la modificación del perfil temporal. Para este fin, se realizó un estudio cuasiexperimental con grupo control en una muestra de 28 estudiantes universitarios; 14 de ellos formaron el grupo experimental y 14 formaron el grupo control. Los resultados muestran que la intervención realizada al grupo experimental modificó la orientación temporal de los participantes hacia un perfil equilibrado. Para terminar, se concluye que, con una intervención breve y grupal que potencie un pasado positivo y un futuro y un presente más saludables, es posible lograr un perfil equilibrado. Posteriores estudios podrían evaluar el impacto de la modificación del perfil temporal en población clínica.

  18. Percepción del tiempo: resultados de una intervención grupal breve para el cambio del perfil temporal

    Directory of Open Access Journals (Sweden)

    Cristián Oyanadel

    2014-06-01

    Full Text Available La teoría de la perspectiva del tiempo de Zimbardo (1999 plantea una clasificación de las dimensiones de la orientación temporal, medidas con el Zimbardo Time Perspective Inventory (ZTPI, la cual propone, por una parte, que si se tiene una actitud positiva y moderada hacia el pasado, el presente y el futuro, se puede desarrollar mayor bienestar y buena salud tanto mental como física, mientras que actitudes negativas o extremas reflejarían pautas de vida poco saludables. El principal objetivo de esta investigación es evaluar el efecto de una intervención grupal breve para la modificación del perfil temporal. Para este fin, se realizó un estudio cuasiexperimental con grupo control en una muestra de 28 estudiantes universitarios; 14 de ellos formaron el grupo experimental y 14 formaron el grupo control. Los resultados muestran que la intervención realizada al grupo experimental modificó la orientación temporal de los participantes hacia un perfil equilibrado. Para terminar, se concluye que, con una intervención breve y grupal que potencie un pasado positivo y un futuro y un presente más saludables, es posible lograr un perfil equilibrado. Posteriores estudios podrían evaluar el impacto de la modificación del perfil temporal en población clínica.

  19. Development and evaluation of TDR probe for water rational management on substrates used in forest seedlings production

    Directory of Open Access Journals (Sweden)

    Lucas Masayuki Sato

    2009-04-01

    Full Text Available Time Domain Reflectometry (TDR is a reliable technique to estimate in situ moisture content in different types of materials using probes. The forest seedlings production implies in a comprehensive and empirical process of water management applied to the substrate used for cultivation in dibble-tube. This type of cultivation requires analysis of the physical characteristics of water and nutrients retention of the substrate. The main goal of this research was to develop and evaluate a TDR coaxial probe for rational management of water in the forest seedlings production. Initially, a physical validation of the probe was performed considering the following parameters: reflection coefficient, characteristic impedance and spatial sensitivity. Also, the performance of the probe was evaluated to estimate water content in laboratory conditions and we obtained a calibration curve for each type of porous material used. The results demonstrated the viability of TDR probes to estimate water content in soil and substrates.

  20. Dielectric properties of clay-rock and their influence on water content measurement with TDR probes

    International Nuclear Information System (INIS)

    Bore, T.; Coelho, D.; Robinet, J.C.; Delepine-Lesoille, S.; Placko, D.; Gatabin, C.; Sabouroux, P.; Six, G.; Taillade, F.

    2012-01-01

    Document available in extended abstract form only. Clays constitute major components for radioactive waste repositories managed by Andra. Water content monitoring is one of the indicators chosen to evaluate the health of the structure. In this perspective, several TDR probes have been installed in various structures, made of three types of clay materials: the bentonite, the clay-rock (Callovo-Oxfordian mud-stone) and the compacted crushed clay-rock. . The technique consists of a time-of-flight measurement of an electric pulse along the TDR probes. To convert flight time propagation delay into water content, calibrations are required. This conversion is however neither accurate, nor generalizable for other mixtures. For precise understanding and modeling of the sensing chain, a better knowledge the complex permittivity of clay materials is necessary. Chosen TDR sensing lines make use of a step electric pulse (such as Campbell TDR100). Considering the rise time of this system, the frequency content of the measured TDR wave form extends from about 20 kHz to roughly 1.5 GHz. Material dielectric must thus be characterized over a broad band frequency. The determination of the electromagnetic properties using non resonant method is fundamentally deduced from their impedance and the wave velocities in the materials. This kind of technique relies on a device able to direct the electromagnetic energy towards a material and to collect the reflected and transmitted parts. In a first step, we designed a transmission line to provide electromagnetic characterizations of clay material. The clay material under test is inserted into a brass coaxial cell specifically designed for our purposes. Two conical transition units surround the specimen holder. The electromagnetic properties of the sample are based on the reflection from the material and the transmission through the material measured by a vector network analyser (VNA). The determination of the electromagnetic properties from

  1. Storing, Browsing, Querying, and Sharing Data: the THREDDS Data Repository (TDR)

    Science.gov (United States)

    Wilson, A.; Lindholm, D.; Baltzer, T.

    2005-12-01

    The Unidata Internet Data Distribution (IDD) network delivers gigabytes of data per day in near real time to sites across the U.S. and beyond. The THREDDS Data Server (TDS) supports public browsing of metadata and data access via OPeNDAP enabled URLs for datasets such as these. With such large quantities of data, sites generally employ a simple data management policy, keeping the data for a relatively short term on the order of hours to perhaps a week or two. In order to save interesting data in longer term storage and make it available for sharing, a user must move the data herself. In this case the user is responsible for determining where space is available, executing the data movement, generating any desired metadata, and setting access control to enable sharing. This task sequence is generally based on execution of a sequence of low level operating system specific commands with significant user involvement. The LEAD (Linked Environments for Atmospheric Discovery) project is building a cyberinfrastructure to support research and education in mesoscale meteorology. LEAD orchestrations require large, robust, and reliable storage with speedy access to stage data and store both intermediate and final results. These requirements suggest storage solutions that involve distributed storage, replication, and interfacing to archival storage systems such as mass storage systems and tape or removable disks. LEAD requirements also include metadata generation and access in order to support querying. In support of both THREDDS and LEAD requirements, Unidata is designing and prototyping the THREDDS Data Repository (TDR), a framework for a modular data repository to support distributed data storage and retrieval using a variety of back end storage media and interchangeable software components. The TDR interface will provide high level abstractions for long term storage, controlled, fast and reliable access, and data movement capabilities via a variety of technologies such as

  2. Simultaneous measurement of unfrozen water content and ice content in frozen soil using gamma ray attenuation and TDR

    Science.gov (United States)

    Zhou, Xiaohai; Zhou, Jian; Kinzelbach, Wolfgang; Stauffer, Fritz

    2014-12-01

    The freezing temperature of water in soil is not constant but varies over a range determined by soil texture. Consequently, the amounts of unfrozen water and ice change with temperature in frozen soil, which in turn affects hydraulic, thermal, and mechanical properties of frozen soil. In this paper, an Am-241 gamma ray source and time-domain reflectometry (TDR) were combined to measure unfrozen water content and ice content in frozen soil simultaneously. The gamma ray attenuation was used to determine total water content. The TDR was used to determine the dielectric constant of the frozen soil. Based on a four-phase mixing model, the amount of unfrozen water content in the frozen soil could be determined. The ice content was inferred by the difference between total water content and unfrozen water content. The gamma ray attenuation and the TDR were both calibrated by a gravimetric method. Water contents measured by gamma ray attenuation and TDR in an unfrozen silt column under infiltration were compared and showed that the two methods have the same accuracy and response to changes of water content. Unidirectional column freezing experiments were performed to apply the combined method of gamma ray attenuation and TDR for measuring unfrozen water content and ice content. The measurement error of the gamma ray attenuation and TDR was around 0.02 and 0.01 m3/m3, respectively. The overestimation of unfrozen water in frozen soil by TDR alone was quantified and found to depend on the amount of ice content. The higher the ice content, the larger the overestimation. The study confirmed that the combined method could accurately determine unfrozen water content and ice content in frozen soil. The results of soil column freezing experiments indicate that total water content distribution is affected by available pore space and the freezing front advance rate. It was found that there is similarity between the soil water characteristic and the soil freezing characteristic of

  3. Magnitude, tendência temporal e fatores associados à anemia em crianças do Estado da Paraíba Magnitud, tendencia temporal y factores asociados a la anemia en niños del Estado de Paraíba Magnitude, time trends and factors associate with anemia in children in the state of Paraíba, Brazil

    Directory of Open Access Journals (Sweden)

    Sheila Sherezaide Rocha Gondim

    2012-08-01

    Full Text Available OBJETIVO: Estimar a prevalência da anemia em crianças, sua tendência temporal e identificar fatores associados. MÉTODOS: Estudo de corte transversal, de base populacional, envolvendo 1.108 crianças, com idade entre seis e 59 meses, de ambos os sexos, do Estado da Paraíba, em 2007. A hemoglobina foi analisada em sangue venoso com contador automático. Foram considerados para anemia valores OBJETIVO: Estimar la prevalencia de la anemia en niños, su tendencia temporal e identificar factores asociados. MÉTODOS: Estudio de corte transversal, de base poblacional, involucrando 1.108 niños, con edad entre 6 a 59 meses, de ambos sexos, del Estado de Paraíba, en 2007. La hemoglobina fue analizada en sangre venosa con contador automático. Se consideraron para anemia valores OBJECTIVE: To estimate the magnitude of the anemia, to analyze the time trends and investigate the factors associated with this disturbance in children in the state of Paraíba, Brazil. METHODS: A cross-sectional survey, of population-based, with 1108 children, aged 6 to 59 months, both sexes in the state of Paraíba. Hemoglobin (Hb in venous blood was analyzed with an automatic counter. The social-economic and demographic characteristics of children were obtained by questionnaire. Proportions were compared by Pearson's chi-squared test, and the association between hemoglobin concentrations and potential risk factors was tested by regression model Poisson. The time trend of anemia was assessed by the increase/decreased in the prevalence of anemia, using as comparison the prevalence observed in the years 1982, 1992 and 2007. RESULTS: The prevalence of anemia (Hb < 11.0 g/dl in the state of Paraíba was 36.5% (CI95% 33.7 to 39.3. It was observed that 1.3% (CI95% 0.7 to 1.8 were in severe form (Hb <7.0 g/dl, 11% (CI95% 9.4 to 13.5 in a moderate form and 87.6% (CI95% 79.1 to 91.2 in the mild form. There was an increase 88.5% in cases of anemia between the years 1982-1992 and

  4. Proposta de um procedimento alternativo para avaliar o ofuscamento: uma abordagem temporal da direção da visão

    Directory of Open Access Journals (Sweden)

    Natalia Giraldo Vásquez

    Full Text Available Resumo O ofuscamento pode ser considerado como um dos aspectos mais complexos do processo de avaliação da iluminação natural devido a sua natureza subjetiva e às limitações nas formas de avaliação. Embora o brilho seja uma resposta subjetiva, muitos índices foram desenvolvidos para quantificar este fenômeno. Os modelos de avaliação de brilho existentes assumem usuários com direções da visão fixas, ignorando o caráter temporal/dinâmico da visão. Neste estudo, um professor foi adotado como sujeito dinâmico para a caracterização das diversas direções da visão. Sendo um trabalho experimental, os procedimentos adotados envolveram o uso de vídeo, um programa para edição de vídeo, imagens HDR e o uso do programa Photolux para o processamento das imagens. Com o valor do DGI obtido para cada direção da visão, a partir de cada posição, em todos os cenários e o tempo que o professor manteve a sua visão para cada direção, foram realizadas duas ponderações pelo tempo de permanência: DGItd (em cada direção e DGItp (em cada posição, permitindo calcular o índice total para a sala de aula. Os resultados indicaram reduções de até 30% no DGI total da sala, com relação ao DGI estático. Este estudo reforça a relevância de se incorporar a condição temporal na avaliação do ofuscamento.

  5. Differential CLE peptide perception by plant receptors implicated from structural and functional analyses of TDIF-TDR interactions

    Energy Technology Data Exchange (ETDEWEB)

    Li, Zhijie; Chakraborty, Sayan; Xu, Guozhou; Kobe, Bostjan

    2017-04-06

    Tracheary Element Differentiation Inhibitory Factor (TDIF) belongs to the family of post-translationally modified CLE (CLAVATA3/embryo surrounding region (ESR)-related) peptide hormones that control root growth and define the delicate balance between stem cell proliferation and differentiation in SAM (shoot apical meristem) or RAM (root apical meristem). In Arabidopsis, Tracheary Element Differentiation Inhibitory Factor Receptor (TDR) and its ligand TDIF signaling pathway is involved in the regulation of procambial cell proliferation and inhibiting its differentiation into xylem cells. Here we present the crystal structures of the extracellular domains (ECD) of TDR alone and in complex with its ligand TDIF resolved at 2.65 Åand 2.75 Å respectively. These structures provide insights about the ligand perception and specific interactions between the CLE peptides and their cognate receptors. Our in vitro biochemical studies indicate that the interactions between the ligands and the receptors at the C-terminal anchoring site provide conserved binding. While the binding interactions occurring at the N-terminal anchoring site dictate differential binding specificities between different ligands and receptors. Our studies will open different unknown avenues of TDR-TDIF signaling pathways that will enhance our knowledge in this field highlighting the receptor ligand interaction, receptor activation, signaling network, modes of action and will serve as a structure function relationship model between the ligand and the receptor for various similar leucine-rich repeat receptor-like kinases (LRR-RLKs).

  6. Biopsia de la arteria temporal: revisión de indicaciones y técnica quirúrgica para cirujanos plásticos Temporal artery biopsy: review of indications and surgical technique for plastic surgeons

    Directory of Open Access Journals (Sweden)

    A. Rodríguez Lorenzo

    2007-06-01

    Full Text Available La arteritis de células gigantes (ACG es una vasculitis que presenta complicaciones graves si no es diagnosticada y tratada precozmente con corticoides a altas dosis. La biopsia de la arteria temporal (BAT es la técnica diagnóstica estandarizada utilizada para confirmar la enfermedad. Se trata de una técnica sencilla y con poca morbilidad. No obstante, en la actualidad existe una controversia sobre su indicación en pacientes con sospecha clínica de arteritis sin síntomas craneales debido a la baja tasa de positividad de la biopsia. Presentamos en este trabajo una serie de 28 pacientes en los que se realizaron 30 BAT con el objetivo de revisar las indicaciones y describir la técnica quirúrgica utilizada.Giant cell arteritis is a vasculitis that presents serious complications if it is not diagnosed and treated prematurely with corticosteroids to high dose. The temporal artery biopsy is the gold estandar technique of diagnosis used to confirm the disease. It is a simple technique with little morbidity. Nevertheless, currently there is a controversy on its indication in patients with clinical suspicion of arteritis without craneal symptoms because of the downward rate of positiveness of the biopsy. We present in this work a serie of 28 patients in which 30 biopsies were carried out with the objective to review the indications and to describe the surgical technique utilized.

  7. Protocolo para la formación de microtubérculos de ñame (Dioscorea alata L. en sistema de inmersión temporal

    Directory of Open Access Journals (Sweden)

    Manuel Cabrera Jova

    2009-07-01

    Full Text Available Con el propósito de desarrollar un protocolo para la formación de microtubérculos en el clon de ñame Pacala Duclos (Dioscorea alata L. en sistema de inmersión temporal, que pudiera ser usado como alternativa para la propagación de esta especie, se definieron como objetivos de trabajo determinar el efecto del tiempo y la frecuencia de inmersión, así como la influencia del volumen de medio de cultivo por planta cultivada in vitro. Con el empleo de 15 min de inmersión y una frecuencia de inmersión cada 6 horas, se alcanzaron los mejores resultados en cuanto al número de microtubérculos formados por planta. Con este tiempo y frecuencia de inmersión los microtubérculos presentaron la mayor masa fresca y seca, así como el mayor diámetro. Además, a las 18 semanas de cultivo se obtuvo el mayor número total de microtubérculos por sistema y el mayor número de microtubérculos aprovechables como material vegetal de propagación. En cuanto al volumen de medio de cultivo por planta, con 60 ml de medio de cultivo por planta in vitro se alcanzó el mayor número de microtubérculos aprovechables, los cuales presentaron el contenido más alto de materia seca. Los microtubérculos obtenidos en este tipo de sistema de inmersión temporal presentaron una masa fresca superior a 2,40 gMF, lo cual podría permitir su uso como material de plantación directo a campo.Abreviaturas: sistema de inmersión temporal (SIT, gramos de masa fresca (gMF, recipiente de inmersión temporal automatizado (RITA.

  8. Morbidade subjacente à concessão de benefício por incapacidade temporária para o trabalho

    Directory of Open Access Journals (Sweden)

    Boff Bernadete M

    2002-01-01

    Full Text Available OBJETIVO: Identificar os agravos à saúde subjacentes à concessão de benefício por incapacidade temporária, na população trabalhadora segurada. MÉTODOS: Foram recuperados do banco de dados do Instituto Nacional de Seguro Social (INSS todos os benefícios do tipo auxílio-doença previdenciário (E-31 concedidos no ano de 1998 aos trabalhadores de Porto Alegre, RS. Os Códigos de Classificação Internacional de Doenças atribuídos à condição subjacente à incapacidade no exame pericial inicial (aX1 foram utilizados para descrever as principais causas e os grupos de causas subjacentes à incapacidade. RESULTADOS: Foram concedidos 6.898 benefícios E-31: 1.486 (22% por "causas externas"; 1.181 (17% por "convalescência após cirurgia" (34% por causas gastrointestinais, 26% genitourinárias, 11% osteomusculares e 10% por causas externas; e 4.119 (61% por "condições clínicas" (24,8% por doenças osteomusculares, 18,9% por doenças mentais e 16,2% por doenças cardiovasculares. Comparadas a estudo realizado no Brasil em 1986, as causas externas passaram da quarta para a primeira posição como determinante de incapacidade temporária para o trabalho. CONCLUSÃO: Acidentes e violências, doenças osteomusculares e doenças mentais -- as três primeiras causas de incapacidade identificadas -- estão potencialmente associadas à piora da qualidade de vida e de trabalho registrada no período e merecem atenção prioritária (preventiva e assistencial do Sistema Único de Saúde (SUS. O estudo demonstra a viabilidade da utilização do banco de dados do INSS para estudos de morbidade.

  9. TESTES ESTATISTICOS DE ESTACIONARIEDADE NO VALOR ESPERADO PARA SÉRIES TEMPORAIS COM DEPENDÊNCIA TEMPORAL SENSÍVEIS A MUDANÇAS GRADUAIS OU ABRUPTAS

    Directory of Open Access Journals (Sweden)

    Jorge Machado Damázio

    2014-08-01

    Full Text Available 10.12957/cadest.2011.15729O artigo apresenta o desenvolvimento de testes estatísticos de verificação de estacionariedade no valor esperado para séries temporais com estrutura de dependência temporal com vistas a distinguir flutuações naturais de mudanças de valor esperado suaves ou abruptas. Os testes são aplicados à série de 75 anos de afluências anuais ao aproveitamento hidroelétrico de São Luiz do Tapajós fornecida pelos estudos hidrológicos dos Estudos de Inventário da Bacia dos Rios Tapajós e Jimanxim, localizadas na região Amazônica

  10. A Study on the Development and Application of Spatial-TDR Sensor for the Management of Groundwater at Riverside

    Directory of Open Access Journals (Sweden)

    Mincheol Park

    2018-04-01

    Full Text Available For sustainable use of water and land, efficient management of river water and groundwater at riverside is required for development. For this purpose, both the groundwater as well as the unsaturated areas should be measured and managed. However, existing point-type sensors have physical limitations. In this study, we developed a spatial-TDR (Time-Domain reflectometer sensor and calibration algorithm for efficient management of riverside groundwater and conducted laboratory and field experiments on whether groundwater level and the unsaturated area can be measured. The rod-type probe shown in ASTM (American Society for Testing and Materials D 6780-05 was modified into a steel wire-type sensing line so that it could be penetrated into the boring hole. The developed sensing line with steel wire is superior in transport and construction to make observations on the groundwater level, but it requires a separate filtering and calibration procedure because it contains a relatively large amount of noise. The raw data of the electric waveform is filtered by applying the moving-average method and the discrete Fourier transform (DFT. The calibration equation for the voltage of electric pulse and degree of saturation of soil calculated in laboratory experiments can be used to calculate the groundwater level and the unsaturated area of the real embankment. The spatial-TDR sensor developed in this study can measure both the groundwater level and the unsaturated area by improving the physical limit of the existing point-TDR sensor of probe-type. Therefore, it can greatly help efficient management of groundwater at riverside. It is necessary to put them into practical use through continuous improvement and experimental verification.

  11. Morbidade subjacente à concessão de benefício por incapacidade temporária para o trabalho Morbidity leading to temporary work disability

    Directory of Open Access Journals (Sweden)

    Bernadete M Boff

    2002-06-01

    Full Text Available OBJETIVO: Identificar os agravos à saúde subjacentes à concessão de benefício por incapacidade temporária, na população trabalhadora segurada. MÉTODOS: Foram recuperados do banco de dados do Instituto Nacional de Seguro Social (INSS todos os benefícios do tipo auxílio-doença previdenciário (E-31 concedidos no ano de 1998 aos trabalhadores de Porto Alegre, RS. Os Códigos de Classificação Internacional de Doenças atribuídos à condição subjacente à incapacidade no exame pericial inicial (aX1 foram utilizados para descrever as principais causas e os grupos de causas subjacentes à incapacidade. RESULTADOS: Foram concedidos 6.898 benefícios E-31: 1.486 (22% por "causas externas"; 1.181 (17% por "convalescência após cirurgia" (34% por causas gastrointestinais, 26% genitourinárias, 11% osteomusculares e 10% por causas externas; e 4.119 (61% por "condições clínicas" (24,8% por doenças osteomusculares, 18,9% por doenças mentais e 16,2% por doenças cardiovasculares. Comparadas a estudo realizado no Brasil em 1986, as causas externas passaram da quarta para a primeira posição como determinante de incapacidade temporária para o trabalho. CONCLUSÃO: Acidentes e violências, doenças osteomusculares e doenças mentais -- as três primeiras causas de incapacidade identificadas -- estão potencialmente associadas à piora da qualidade de vida e de trabalho registrada no período e merecem atenção prioritária (preventiva e assistencial do Sistema Único de Saúde (SUS. O estudo demonstra a viabilidade da utilização do banco de dados do INSS para estudos de morbidade.INTRODUCTION: To identify health conditions leading to benefits due to temporary work disability in a population of insured workers. METHODS: International Classification of Diseases (ICD codes for conditions resulting in temporary work-disability (E-31 were retrieved from the National Institute of Social Security (INSS data bank in Porto Alegre, Brazil, in

  12. Efectividad biológica delazoxystrobin para el control de pyricularia oryzae cav. y cercospora oryzae miyake. en arroz de temporal en Veracruz, México

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    Enrique Becerra

    2001-01-01

    Full Text Available El estado de Veracruz, México, siembra anualmente 22000 ha de arroz de temporal con un rendimiento medio de 3,5 t/ha, debido principalmente a problemas de sequía lo cual favorece la presencia de hongos como Pyricularia oryzae Cav. (quema del arroz y Cercospora oryzae Miyake. (Mancha angosta. Con el objeto de conocer el comportamiento de nuevos fungicidas se evaluó la eficacia del Azoxystrobin en el control de estos hongos. El experimento se estableció en el municipio de Tres Valles, Veracruz, durante el temporal de 1999, con semilla de Milagro Filipino Depurado. El diseño estadístico utilizado fue bloques al azar con cuatro repeticiones. Los tratamientos evaluados fueron: Azoxystrobin a 0,2, 0,4 y 0,6 l/ha vs Tecto60 a 0,5 kg/ha y un testigo sin aplicación. Estos fueron aplicados al presentarse los primeros síntomas de las enfermedades. Se evaluó la incidencia, número de lesiones en 20 plantas, índice de intensidad, el rendimiento de grano y fitotoxicidad. Se encontró que el Azoxystrobin obtuvo mejores resultados que el Tecto 60 y éste a su vez que el testigo no tratado. El mejor control para P. oryzae y C. oryzae y el mayor rendimiento de grano (4432 kg/ha se logró cuando se aplicó Azoxystrobin en dosis de 0,6 l/ha, aunque con 0,2 y 0,4 l/ha de este fungicida tuvo un buen control de estas enfermedades. Ninguno de los fungicidas causó toxicidad al arroz

  13. Duración del periodo de lluvias y aptitud de tierras para la agricultura de temporal / Duration of the rain period and land suitability for rainfed agriculture

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    Carmen Delgado

    2017-09-01

    Full Text Available . El concepto duración del periodo de lluvias (DPLL es una propuesta de mejoramiento de otro denominado longitud del periodo de crecimiento (LPC. El objetivo fue realizar un mapa de aptitud para la agricultura de temporal basado en la selección de un modelo de la duración del periodo de lluvias con el índice de humedad. Se utilizaron los datos de 65 estaciones meteorológicas del estado de Yucatán y zonas circundantes. Se analizó la relación entre el resultado del modelo con el mapa de la vegetación potencial. Se encontró que el índice de humedad es mayor cuando proviene del método de Thornthwaite (MT, con el que se obtuvo el mejor modelo cartográco con valor de denición de un mes húmedo cuando es mayor a 0.65. El variograma fue tipo Gaussiano con una r2 = 0.98 y el porcentaje de la varianza explicada C/(C0+C = 74 %. La validación cruzada de la interpolación presentó una r= 0.63 y la raíz cuadrada del error cuadrático medio (RECM = 1.34. Los cinco intervalos de meses húmedos de interés agrícola fue de tres a cuatro meses, de cuatro a cinco meses, de cinco a seis meses, de seis a siete meses, y de siete a ocho meses

  14. Tracking the career development of scientists in low- and middle-income countries trained through TDR's research capacity strengthening programmes: Learning from monitoring and impact evaluation.

    Science.gov (United States)

    Halpaap, Béatrice; Vahedi, Mahnaz; Certain, Edith; Alvarado, Tini; Saint Martin, Caroline; Merle, Corinne; Mihut, Michael; Launois, Pascal

    2017-12-01

    The Special Programme for Research and Training in Tropical Diseases (TDR) co-sponsored by UNICEF, UNDP, World Bank and WHO has been supporting research capacity strengthening in low- and middle-income countries for over 40 years. In order to assess and continuously optimize its capacity strengthening approaches, an evaluation of the influence of TDR training grants on research career development was undertaken. The assessment was part of a larger evaluation conducted by the European Science Foundation. A comprehensive survey questionnaire was developed and sent to a group of 117 trainees supported by TDR who had completed their degree (masters or PhD) between 2000 and 2012; of these, seventy seven (77) responded. Most of the respondents (80%) rated TDR support as a very important factor that influenced their professional career achievements. The "brain drain" phenomenon towards high-income countries was particularly low amongst TDR grantees: the rate of return to their region of origin upon completion of their degree was 96%. A vast majority of respondents are still working in research (89%), with 81% of respondents having participated in multidisciplinary research activities; women engaged in multidisciplinary collaboration to a higher extent than men. However, only a minority of all have engaged in intersectoral collaboration, an aspect that would require further study. The post-degree career choices made by the respondents were strongly influenced by academic considerations. At the time of the survey, 92% of all respondents hold full-time positions, mainly in the public sector. Almost 25% of the respondents reported that they had influenced policy and practice changes. Some of the challenges and opportunities faced by trainees at various stages of their research career have been identified. Modalities to overcome these will require further investigation. The survey evidenced how TDR's research capacity grant programmes made a difference on researchers' career

  15. Tracking the career development of scientists in low- and middle-income countries trained through TDR's research capacity strengthening programmes: Learning from monitoring and impact evaluation.

    Directory of Open Access Journals (Sweden)

    Béatrice Halpaap

    2017-12-01

    Full Text Available The Special Programme for Research and Training in Tropical Diseases (TDR co-sponsored by UNICEF, UNDP, World Bank and WHO has been supporting research capacity strengthening in low- and middle-income countries for over 40 years. In order to assess and continuously optimize its capacity strengthening approaches, an evaluation of the influence of TDR training grants on research career development was undertaken. The assessment was part of a larger evaluation conducted by the European Science Foundation. A comprehensive survey questionnaire was developed and sent to a group of 117 trainees supported by TDR who had completed their degree (masters or PhD between 2000 and 2012; of these, seventy seven (77 responded. Most of the respondents (80% rated TDR support as a very important factor that influenced their professional career achievements. The "brain drain" phenomenon towards high-income countries was particularly low amongst TDR grantees: the rate of return to their region of origin upon completion of their degree was 96%. A vast majority of respondents are still working in research (89%, with 81% of respondents having participated in multidisciplinary research activities; women engaged in multidisciplinary collaboration to a higher extent than men. However, only a minority of all have engaged in intersectoral collaboration, an aspect that would require further study. The post-degree career choices made by the respondents were strongly influenced by academic considerations. At the time of the survey, 92% of all respondents hold full-time positions, mainly in the public sector. Almost 25% of the respondents reported that they had influenced policy and practice changes. Some of the challenges and opportunities faced by trainees at various stages of their research career have been identified. Modalities to overcome these will require further investigation. The survey evidenced how TDR's research capacity grant programmes made a difference on

  16. Potential use of carbon-11 labeled thymidine (TdR) for studying the effect of therapy on prostatic adenocarcinoma in vivo

    International Nuclear Information System (INIS)

    Conti, P.S.; Kleinert, E.L.; Schma, B.; Herr, H.W.; Whitmore, W.F. Jr.

    1984-01-01

    Alterations in tumor growth, such as those which occur during therapeutic manipulation, may be followed by measuring variations in radiolabeled TdR uptake. In order to study such parameters in vivo using external imaging techniques, the authors have synthesized TdR labeled with cyclotron produced carbon-11, a short-lived (T1/2=20.4 min) positron-emitting radionuclide. The Copenhagen rat bearing the transplantable Dunning R3327G prostatic adenocarcinoma can be used as a model for poorly differentiated carcinoma of the prostate in humans. The tissue distribution of C-14 TdR was studied in untreated tumor rats and in tumor rats receiving a combination of difluoromethyl ornithine and methylglyoxal-bis-guanylhydrazone, effective inhibitors of polyamine biosynthesis. The tissue distribution at 45 min post-injection (5 rats/group) was determined by calculating the relative concentration (RC) of radioactivity in blood and tissue samples (RC=dpm found per gm tissue/dpm injected per gm animal mass). The mean RC in untreated tumor was 2.55 +- 0.46, compared to 0.85 +- 0.12 in treated tumor. Tumor/blood, tumor/muscle and tumor/prostate ratios were 3.07, 7.08, and 6.89 in untreated tumor, and 1.23, 3.04, and 2,93 in treated tumor. The differences in RC for the untreated and treated tumors suggest that external imaging with C-11 TdR may be useful for monitoring the effects of therapy on tumors in vivo

  17. Costo institucional del paciente con incapacidad temporal para el trabajo por lumbalgia mecánica. [Institutional cost of the patient with temporary inability to work due to mechanical low back pain

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    María del Carmen Ponce Martínez

    2013-10-01

    Full Text Available In­tro­duc­ción La lumbalgia afecta de manera frecuente a la población económicamente activa. Es la primera causa de pérdida de días laborales en trabajadores menores de 55 años de edad y la segunda de ausentismo laboral. Objetivo Determinar el costo institucional del paciente con incapacidad temporal para el trabajo por lumbalgia mecánica. Material­ y­ métodos Se realizó un estudio de costos de expedientes de trabajadores con lumbalgia de 20 a 60 años con incapacidad temporal para el trabajo. El tamaño de la muestra (228 pacientes se calculó con la fórmula de promedios para población infinita con nivel de confianza del 95%. La técnica muestral fue por cuota empleando como marco muestral el listado de pacientes con incapacidad temporal para el trabajo y diagnóstico de lumbalgia mecánica. las variables estudiadas fueron las características sociodemográficas, el perfil de uso, costo unitario y costo promedio de los servicios otorgados. El análisis estadístico incluyó porcentajes, promedios, intervalo de confianza y proyección. Resultados El costo total promedio por paciente con lumbalgia mecánica es de 1744,08 uSD, la incapacidad es el costo más elevado (1083,71 uSD, seguido de los estudios de gabinete (394,89 uSD, las consultas (180,52 uSD, los medicamentos y el laboratorio. Conclusión El costo institucional del paciente con incapacidad temporal para el trabajo con lumbalgia mecánica resulta en miles de dólares y, proyectado a una población de pacientes, el costo se incrementa a millones.

  18. Impact of health research capacity strengthening in low- and middle-income countries: the case of WHO/TDR programmes.

    Science.gov (United States)

    Minja, Happiness; Nsanzabana, Christian; Maure, Christine; Hoffmann, Axel; Rumisha, Susan; Ogundahunsi, Olumide; Zicker, Fabio; Tanner, Marcel; Launois, Pascal

    2011-10-01

    Measuring the impact of capacity strengthening support is a priority for the international development community. Several frameworks exist for monitoring and evaluating funding results and modalities. Based on its long history of support, we report on the impact of individual and institutional capacity strengthening programmes conducted by the UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases (TDR) and on the factors that influenced the outcome of its Research Capacity Strengthening (RCS) activities. A mix of qualitative and quantitative methods (questionnaires and in-depth interviews) was applied to a selected group of 128 individual and 20 institutional capacity development grant recipients that completed their training/projects between 2000 and 2008. A semi-structured interview was also conducted on site with scientists from four institutions. Most of the grantees, both individual and institutional, reported beneficial results from the grant. However, glaring inequities stemming from gender imbalances and a language bias towards English were identified. The study showed that skills improvement through training contributed to better formulation of research proposals, but not necessarily to improved project implementation or communication of results. Appreciation of the institutional grants' impact varied among recipient countries. The least developed countries saw the programmes as essential for supporting basic infrastructure and activities. Advanced developing countries perceived the research grants as complementary to available resources, and particularly suitable for junior researchers who were not yet able to compete for major international grants. The study highlights the need for a more equitable process to improve the effectiveness of health research capacity strengthening activities. Support should be tailored to the existing research capacity in disease endemic countries and should focus on strengthening

  19. Impact of health research capacity strengthening in low- and middle-income countries: the case of WHO/TDR programmes.

    Directory of Open Access Journals (Sweden)

    Happiness Minja

    2011-10-01

    Full Text Available BACKGROUND: Measuring the impact of capacity strengthening support is a priority for the international development community. Several frameworks exist for monitoring and evaluating funding results and modalities. Based on its long history of support, we report on the impact of individual and institutional capacity strengthening programmes conducted by the UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases (TDR and on the factors that influenced the outcome of its Research Capacity Strengthening (RCS activities. METHODOLOGY AND PRINCIPAL FINDINGS: A mix of qualitative and quantitative methods (questionnaires and in-depth interviews was applied to a selected group of 128 individual and 20 institutional capacity development grant recipients that completed their training/projects between 2000 and 2008. A semi-structured interview was also conducted on site with scientists from four institutions. Most of the grantees, both individual and institutional, reported beneficial results from the grant. However, glaring inequities stemming from gender imbalances and a language bias towards English were identified. The study showed that skills improvement through training contributed to better formulation of research proposals, but not necessarily to improved project implementation or communication of results. Appreciation of the institutional grants' impact varied among recipient countries. The least developed countries saw the programmes as essential for supporting basic infrastructure and activities. Advanced developing countries perceived the research grants as complementary to available resources, and particularly suitable for junior researchers who were not yet able to compete for major international grants. CONCLUSION: The study highlights the need for a more equitable process to improve the effectiveness of health research capacity strengthening activities. Support should be tailored to the existing research

  20. Review of Temporary Employment Literature: Perspectives for Research and Development in Latin America Revisión de la Literatura sobre Trabajo Temporal: Perspectivas para la Investigación y el Desarrollo en América Latina

    Directory of Open Access Journals (Sweden)

    Gabriel Martínez

    2010-05-01

    Full Text Available Temporary employment has become a major concern in the last decades: it is seen as the result of the continuous changes in the working system around the world. The effects of temporary employment for the employees and the organization have not been established yet, because there are many variables that can affect the observed outcomes. This article addresses the literature about temporary employment to date: an overview of the main characteristics associated with temporary employment and the most recent empirical studies concerning the outcomes associated with temporary employment is presented. Furthermore, attention is drawn to temporary work research in Latin America, in order to establish the development of the field and the perspectives for future research.El trabajo temporal se ha convertido en una preocupación mayor durante las pasadas décadas: se ve como el resultado de los continuos cambios en el sistema laboral alrededor del mundo. Los efectos del trabajo temporal para los trabajadores y las organizaciones no han sido establecidos aún, debido a que existen diversas variables que pueden afectar los resultados observados. El enfoque de este artículo es la literatura de trabajo temporal hasta la fecha, presentando una visión general de las principales características asociadas al trabajo temporal y los más recientes trabajos empíricos relativos a sus consecuencias. La atención se dirige a las investigaciones sobre trabajo temporal en América Latina, con el fin de establecer el desarrollo en el área y la perspectiva de investigaciones futuras.

  1. Superfícies de resposta espectro-temporal de imagens do sensor MODIS para classificação de área de soja no Estado do Rio Grande do Sul Spectral-temporal response surface of MODIS sensor images for soybean area classification in Rio Grande do Sul State

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    Conrado de Moraes Rudorff

    2007-02-01

    Full Text Available Este trabalho objetivou avaliar o potencial e as limitações das imagens MODIS para classificação e estimativa de área de soja por meio do método de superfície de resposta espectro-temporal (Spectral-Temporal Response Surface - STRS. Um mapa temático das áreas com soja, oriundo da classificação de imagens Landsat do Estado do Rio Grande do Sul, foi utilizado como referência para auxiliar na orientação da amostragem dos pixels de treinamento e para a comparação dos resultados. Seis imagens compostas do sensor MODIS foram utilizadas para a classificação supervisionada da área de soja por meio do algoritmo de máxima verossimilhança (MAXVER adaptado ao método STRS. Os resultados foram avaliados pelo coeficiente Kappa para a totalidade da área em estudo e também para uma região de latifúndios e outra de minifúndios. O método STRS subestimou em 6,6% a área de soja para toda a região estudada, sendo que a estatística Kappa foi de 0,503. Para as regiões de latifúndios e minifúndios, a área de soja foi superestimada em 8% (Kappa=0,424 e subestimada em 43,4% (Kappa=0,358, respectivamente. As imagens MODIS, por meio do método STRS, demonstraram ter potencial para classificar a área de soja, principalmente em regiões de latifúndios. Em regiões de minifúndios, a correta identificação e classificação das áreas de soja mostrou-se pouco eficiente em razão da baixa resolução espacial das imagens MODIS.This paper was aimed at evaluating the potential and the limitations of MODIS images for soybean classification and area estimation through a Spectral-Temporal Response Surface (STRS method. A soybean thematic map from Rio Grande do Sul State, Brazil, derived from Landsat images was used as reference data to assist both sample training and results comparison. Six 16-day composite MODIS images were classified through a supervised maximum likelihood algorithm (MAXVER adapted to the STRS method. The results were

  2. Measuring the layer-average volumetric water content in the uppermost 5 cm of soil using printed circuit board TDR probes

    International Nuclear Information System (INIS)

    Wang, W.; Kobayashi, T.; Chikushi, J.

    2000-01-01

    Newly designed printed circuit board TDR probes (PCBPs) were made, and they were calibrated by indoor experiment. A regression equation for estimating the volumetric water content from the dielectric constant measured with the PCBP was determined, which is almost the same as the well-known Topp's equation when the soil is rather wet while the difference becomes larger as the soil dries. The PCBP was designed to measure the average water content over a soil layer 5 cm thick because the thickness of soil layer involved in measuring water content by microwave remote sensing is several centimeters. A comparison experiment of measurements with PCBPs and those by microwave remote sensing was conducted in an arid area in the northwest of China. The results of this experiment show that the newly designed TDR probe is promising as the sensor to get ground truth of the surface wetness. This paper describes only the calibration of probes and the observations taken using them

  3. Análise espaço-temporal da clorose variegada dos citros no Noroeste do Paraná, com uso de PCR para detecção de Xylella fastidiosa = Spatio-temporal analysis of the citrus variegated chlorosis (CVC in the Northwest of Paraná, using PCR for detection of Xylella fastidiosa

    Directory of Open Access Journals (Sweden)

    William Mário de Carvalho Nunes

    2006-07-01

    Full Text Available A citricultura é afetada por inúmeras doenças, como a clorose variegada do citros (CVC, causada pela bactéria Xylella fastidiosa. O objetivo deste trabalho foi determinar a distribuição espacial da doença dentro de pomares comerciais do Noroeste do Paraná com o uso de métodos moleculares. Foram selecionados pomares sintomáticos para CVC com as variedades ‘Pêra’, ‘Valência’ e ‘Folha Murcha’ (Citrus sinensis Osbeck. Foram marcadas para cada variedade, 4 plantas-referência positivas para CVC (por sintomas e análise molecular e 8 plantas ao redor de cada uma das plantas-referência foram amostradas, num total de 36 plantas por variedade. Realizou-se o teste da Reação da Polimerase em Cadeia (PCR para detecção da bactéria e na mesma época foram conduzidas avaliações visuais de sintomas de CVC. Os resultados da análise temporal, utilizando-se os modelos Monomolecular, Logístico e Gompertz, apontaram o modelo Logístico como o que melhor se ajustou para descrever o comportamento da doença no tempo, para todas as variedades estudadas. Observou-se que o comportamento espacial da doença diferiu quando a mesma área foiavaliada pelos métodos visual e molecular, resultando em uma diferença no padrão espacial das áreas avaliadas. Portanto, ambos os métodos empregados, sintomas e PCR, foram capazes de constatar asmudanças no padrão espacial apresentado, sendo que a análise molecular (PCR foi mais sensível para detectar as mudanças ocorridas.Countless diseases affect the citriculture, as the citrus variegated chlorosis (CVC which is caused by the bacteria Xylella fastidiosa.The aim of this work was to determine the space distribution of the disease inside commercial orchards in the Northwest of Paraná, using molecular methods. Symptomatic orchards were selected for CVC with the varieties 'Pêra', 'Valência' and 'Folha Murcha' (Citrus sinensis Osbeck. For each variety, 4 positive reference-plant for CVC

  4. Temporal networks

    CERN Document Server

    Saramäki, Jari

    2013-01-01

    The concept of temporal networks is an extension of complex networks as a modeling framework to include information on when interactions between nodes happen. Many studies of the last decade examine how the static network structure affect dynamic systems on the network. In this traditional approach  the temporal aspects are pre-encoded in the dynamic system model. Temporal-network methods, on the other hand, lift the temporal information from the level of system dynamics to the mathematical representation of the contact network itself. This framework becomes particularly useful for cases where there is a lot of structure and heterogeneity both in the timings of interaction events and the network topology. The advantage compared to common static network approaches is the ability to design more accurate models in order to explain and predict large-scale dynamic phenomena (such as, e.g., epidemic outbreaks and other spreading phenomena). On the other hand, temporal network methods are mathematically and concept...

  5. Dinámica espacio-temporal del esfuerzo en una pesquería de buceo artesanal multiespecífica y sus efectos en la variabilidad de las capturas: Implicaciones para el manejo sostenible

    Directory of Open Access Journals (Sweden)

    Helven Naranjo Madrigal

    2014-12-01

    Full Text Available Las pesquerías artesanales asociadas a métodos de buceo son fuente de ingreso, empleo y seguridad alimentaria de zonas costeras en muchos países. Los altos precios y la poca movilidad de especies bénticas capturadas por buceo enfrentan retos cada vez mayores en su aprovechamiento y manejo, esto demanda un entendimiento integral de estas pesquerías en diferentes contextos, incluyendo la dinámica espacial y temporal del esfuerzo pesquero, las artes y las especies. En el presente estudio se busca elucidar si existen diferencias en las estrategias de pesca desarrolla- das por pescadores que emplean buceo en dos modalidades (hookah y buceo libre. También se busca conocer si se desarrollan adaptaciones de estas estrategias en el tiempo, bajo qué condiciones y el posible efecto de las estrategias sobre las capturas. Para ese fin se analizó información detallada de las operaciones de pesca de embarcaciones artesanales que operan en la costa del océano Pacífico de Costa Rica durante dos temporadas de pesca. Se analizó información obtenida a bordo de embarcaciones como: sitio de pesca, composición de especies, tiempo de pesca, número de inmersiones por viaje, entre otros; y se aplicaron entrevistas a buzos al momento de las descargas para obtener información de precios, el volumen de las especies capturadas y forma de operación de los pescadores. Para el buceo con hookah se obtuvo una muestra del 69.3% del total de viajes en las dos temporadas de pesca y en el caso del buceo libre se obtuvo una muestra del 41.9% del total de viajes en las dos temporadas de pesca estudiadas (2007-2008 y 2011-2012. Se identificaron más de 15 especies en cada temporada de pesca, dominaron tres categorías en ambas temporadas pero con diferencias en las proporciones obtenidas en cada caso: langosta (Panulirus gracilis, pulpo (Octopus sp y pez loro (Scarus perrico y S. Ghobban. Resalta un componente importante de captura retenida por los pescadores para

  6. Project Temporalities

    DEFF Research Database (Denmark)

    Tryggestad, Kjell; Justesen, Lise; Mouritsen, Jan

    2013-01-01

    Purpose – The purpose of this paper is to explore how animals can become stakeholders in interaction with project management technologies and what happens with project temporalities when new and surprising stakeholders become part of a project and a recognized matter of concern to be taken...... into account. Design/methodology/approach – The paper is based on a qualitative case study of a project in the building industry. The authors use actor-network theory (ANT) to analyze the emergence of animal stakeholders, stakes and temporalities. Findings – The study shows how project temporalities can...... multiply in interaction with project management technologies and how conventional linear conceptions of project time may be contested with the emergence of new non-human stakeholders and temporalities. Research limitations/implications – The study draws on ANT to show how animals can become stakeholders...

  7. Dinâmica temporal do estrato herbáceo-arbustivo de uma área de campo limpo úmido em Alto Paraíso de Goiás, Brasil Temporal dynamics of the shrub and herbaceous layer of an area of moist grassland in Alto Paraíso de Goiás, Brazil

    Directory of Open Access Journals (Sweden)

    Chesterton Ulysses Orlando Eugênio

    2011-06-01

    Full Text Available Este trabalho avaliou a dinâmica estrutural e florística de uma comunidade de espécies herbáceo-arbustivas de uma área de campo limpo úmido em Alto Paraíso de Goiás, o primeiro inventário realizado em 2000 (T0 e o segundo em 2007 (T1. A diversidade de Shannon entre os períodos foi comparada pelo teste-t de Hutcheson e a similaridade florística, pelo índice de similaridade de Chao-Sørensen. As relações florísticas e a cobertura, entre os períodos e as linhas, foram avaliadas por meio de análises de correspondência retificada (DCA. Foram amostradas 98 espécies, 88 no T0 e 67 no T1, sendo 31 exclusivas do T0 e 10 do T1. A diversidade florística na comunidade foi elevada nos dois períodos, porém diferente entre esses (t = 7,12; p This study evaluated the floristic and structural dynamics of a community of herbaceous-shrub species in an area of moist grassland in Alto Paraíso de Goiás. Th e fi rst inventory was undertaken in 2000 (T0 and the second in 2007 (T1. Shannon's diversity between the periods was compared by Hutchesons´s t-test, and the floristic similarity by the Chao-Sørensen similarity index. Floristic composition and cover, between periods and lines, were evaluated by detrended correspondence analysis (DCA. We sampled 98 species, 88 at T0 and 67 at T1; 31 were unique to T0 and 10 to T1. Floristic diversity in the community was high in both periods, but diff erent between them (t = 7.12, p <0.001, due to variation in species number and coverage. Similarity between the two surveys was high (Chao-Sørensen CI = ± 0.841 ± 0.074. The DCA ordination indicated relationships between the floristic composition and cover with a gradient of moisture and organic matter in the soil identified in T0. Th ere were changes in the lines in the seasonal zones, which became more similar in those constantly saturated with water. During an interval of seven years the moist grassland showed changes in floristic composition and mainly

  8. Temporal networks

    Science.gov (United States)

    Holme, Petter; Saramäki, Jari

    2012-10-01

    A great variety of systems in nature, society and technology-from the web of sexual contacts to the Internet, from the nervous system to power grids-can be modeled as graphs of vertices coupled by edges. The network structure, describing how the graph is wired, helps us understand, predict and optimize the behavior of dynamical systems. In many cases, however, the edges are not continuously active. As an example, in networks of communication via e-mail, text messages, or phone calls, edges represent sequences of instantaneous or practically instantaneous contacts. In some cases, edges are active for non-negligible periods of time: e.g., the proximity patterns of inpatients at hospitals can be represented by a graph where an edge between two individuals is on throughout the time they are at the same ward. Like network topology, the temporal structure of edge activations can affect dynamics of systems interacting through the network, from disease contagion on the network of patients to information diffusion over an e-mail network. In this review, we present the emergent field of temporal networks, and discuss methods for analyzing topological and temporal structure and models for elucidating their relation to the behavior of dynamical systems. In the light of traditional network theory, one can see this framework as moving the information of when things happen from the dynamical system on the network, to the network itself. Since fundamental properties, such as the transitivity of edges, do not necessarily hold in temporal networks, many of these methods need to be quite different from those for static networks. The study of temporal networks is very interdisciplinary in nature. Reflecting this, even the object of study has many names-temporal graphs, evolving graphs, time-varying graphs, time-aggregated graphs, time-stamped graphs, dynamic networks, dynamic graphs, dynamical graphs, and so on. This review covers different fields where temporal graphs are considered

  9. Study of the dependence of resolution temporal activity for a Philips gemini TF PET/CT scanner by applying a statistical analysis of time series; Estudio de la dependencia de la resolucion temporal con la actividad para un escaner PET-TAC philips gemini TF aplicando un analisis estadistico de series temporales

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Merino, G.; Cortes Rpdicio, J.; Lope Lope, R.; Martin Gonzalez, T.; Garcia Fidalgo, M. A.

    2013-07-01

    The aim of the present work is to study the dependence of temporal resolution with the activity using statistical techniques applied to the series of values time series measurements of temporal resolution during daily equipment checks. (Author)

  10. Temporal naturalism

    Science.gov (United States)

    Smolin, Lee

    2015-11-01

    Two people may claim both to be naturalists, but have divergent conceptions of basic elements of the natural world which lead them to mean different things when they talk about laws of nature, or states, or the role of mathematics in physics. These disagreements do not much affect the ordinary practice of science which is about small subsystems of the universe, described or explained against a background, idealized to be fixed. But these issues become crucial when we consider including the whole universe within our system, for then there is no fixed background to reference observables to. I argue here that the key issue responsible for divergent versions of naturalism and divergent approaches to cosmology is the conception of time. One version, which I call temporal naturalism, holds that time, in the sense of the succession of present moments, is real, and that laws of nature evolve in that time. This is contrasted with timeless naturalism, which holds that laws are immutable and the present moment and its passage are illusions. I argue that temporal naturalism is empirically more adequate than the alternatives, because it offers testable explanations for puzzles its rivals cannot address, and is likely a better basis for solving major puzzles that presently face cosmology and physics. This essay also addresses the problem of qualia and experience within naturalism and argues that only temporal naturalism can make a place for qualia as intrinsic qualities of matter.

  11. Preditores espaço-temporais do andar para testes de capacidade funcional em pacientes com doença de Parkinson Gait spatial and temporal predictors for functional capacity tests in Parkinson's disease patients

    Directory of Open Access Journals (Sweden)

    MDR Sánchez-Arias

    2008-10-01

    Full Text Available OBJETIVOS: Determinar quais parâmetros espaço-temporais são preditores do andar de indivíduos com doença de Parkinson idiopática para os testes de resistência aeróbia e agilidade, propostos pela bateria de testes da American Alliance for Health, Physical Education, Recreation and Dance (AAHPERD. MATERIAIS E MÉTODOS: Foram selecionados seis homens e seis mulheres com comprometimento e estágio da doença em níveis leve e moderado, que realizaram os testes de agilidade e resistência aeróbia, conforme o protocolo da AAHPERD, e andaram 8m sobre uma passarela. Uma câmera digital registrou uma passada central. Marcadores foram fixados no quinto metatarso e na face lateral do calcâneo do membro inferior direito e no primeiro metatarso e na face medial do calcâneo do membro inferior esquerdo. As variáveis dependentes selecionadas foram: tempo nos testes de agilidade e resistência e as variáveis cinemáticas (comprimento da passada - CP, cadência - CAD, duração da passada - DP, duração da fase de duplo suporte - DDS, duração do suporte simples - SS, duração da fase de balanço - DB e velocidade da passada - VP. RESULTADOS: Para agilidade, o teste de Pearson apontou correlação estatisticamente significativa entre as variáveis CP (r=-0,70; pOBJECTIVE: To determine which spatial and temporal parameters are predictors of the gait pattern of individuals with idiopathic Parkinson's disease, for the aerobic endurance and agility tests included in the battery of tests of the AAHPERD protocol. METHODS: Six men and six women with mild and moderate impairment and disease stage were selected. They performed agility and aerobic endurance test in accordance with the AAHPERD protocol, and walked 8 m on a walkway. A digital video camera recorded one central stride. Markers were attached to the fifth metatarsal and lateral face of the calcaneus of the right leg and to the first metatarsal and medial face of the calcaneus of the left leg. The

  12. Temporal contingency

    Science.gov (United States)

    Gallistel, C.R.; Craig, Andrew R.; Shahan, Timothy A.

    2015-01-01

    Contingency, and more particularly temporal contingency, has often figured in thinking about the nature of learning. However, it has never been formally defined in such a way as to make it a measure that can be applied to most animal learning protocols. We use elementary information theory to define contingency in such a way as to make it a measurable property of almost any conditioning protocol. We discuss how making it a measurable construct enables the exploration of the role of different contingencies in the acquisition and performance of classically and operantly conditioned behavior. PMID:23994260

  13. Temporal contingency.

    Science.gov (United States)

    Gallistel, C R; Craig, Andrew R; Shahan, Timothy A

    2014-01-01

    Contingency, and more particularly temporal contingency, has often figured in thinking about the nature of learning. However, it has never been formally defined in such a way as to make it a measure that can be applied to most animal learning protocols. We use elementary information theory to define contingency in such a way as to make it a measurable property of almost any conditioning protocol. We discuss how making it a measurable construct enables the exploration of the role of different contingencies in the acquisition and performance of classically and operantly conditioned behavior. Copyright © 2013 Elsevier B.V. All rights reserved.

  14. Temporal Glare

    DEFF Research Database (Denmark)

    Ritschel, Tobias; Ihrke, Matthias; Frisvad, Jeppe Revall

    2009-01-01

    Glare is a consequence of light scattered within the human eye when looking at bright light sources. This effect can be exploited for tone mapping since adding glare to the depiction of high-dynamic range (HDR) imagery on a low-dynamic range (LDR) medium can dramatically increase perceived contra...... to initially static HDR images. By conducting psychophysical studies, we validate that our method improves perceived brightness and that dynamic glare-renderings are often perceived as more attractive depending on the chosen scene.......Glare is a consequence of light scattered within the human eye when looking at bright light sources. This effect can be exploited for tone mapping since adding glare to the depiction of high-dynamic range (HDR) imagery on a low-dynamic range (LDR) medium can dramatically increase perceived contrast....... Even though most, if not all, subjects report perceiving glare as a bright pattern that fluctuates in time, up to now it has only been modeled as a static phenomenon. We argue that the temporal properties of glare are a strong means to increase perceived brightness and to produce realistic...

  15. Analysis of series temporal vegetation obtained by tele detection as tool for a tracking processes of desertification; Analisis de series temporales de vegetacion obtenidas mediante teledeteccion como herramienta para el seguimiento de procesos de desertificacion

    Energy Technology Data Exchange (ETDEWEB)

    Melendez-Pastor, I.; Navarro-Pedreno, J.; Gomez, I.; Koch, M.

    2009-07-01

    This risk of desertification in the Mediterranean Basin, is evident in the southeast of the Iberian Peninsula, where land degradation reaches unsustainable levels. this study aims to analyse the temporal evolution of land covers as an indicator of soil desertification. time series of vegetation indices derived from satellite remote sensing images were analysed. Various climatic variables as possible causes of land covers behaviour were considered. The existence of a large inter-annual and intra-annual variability for all land covers and precipitation was observed. It is showed an association between temporal patterns of vegetation series of different land uses and rainfall. (Author) 8 refs.

  16. ENTRE LA NECESIDAD Y EL NO RECONOCIMIENTO: LA VALORACIÓN DE LA DIMENSIÓN TEMPORAL EN LAS ESTRATEGIAS FAMILIARES PARA LA CONTRATACIÓN DE CUIDADORAS DOMÉSTICAS INMIGRANTES EN ESPAÑA Y CHILE

    OpenAIRE

    Acosta,Elaine

    2013-01-01

    El artículo tiene por objeto analizar el sentido que se le atribuye al recurso tiempo en la conformación de las estrategias familiares para la contratación de cuidadoras inmigrantes en el ámbito doméstico y las percepciones de las mujeres inmigrantes cuidadoras sobre el uso del tiempo en la definición y gestión de sus condiciones laborales.Para el análisis se han seleccionado los casos de España y Chile, que representan dos sociedades de destino de flujos migratorios altamente feminizados que...

  17. Uso do produto MOD13Q1 do sensor Modis para análise temporal e mapeamento das florestas nas Serras do Sudeste e Campanha Meridional do Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Ana Caroline Paim Benedetti

    2013-06-01

    Full Text Available Imagens NDVI (Índice de Vegetação por Diferença Normalizada do sensor Modis foram utilizadas para mapear as classes de uso e cobertura da terra nas Serras do Sudeste e Campanha Meridional do Rio Grande do Sul. A metodologia compreendeu a elaboração de um banco de dados espaciais e a aplicação de técnicas de processamento digital (contraste linear, classificação digital e operações aritméticas sobre imagens dos satélites Landsat e Terra de diversas datas. Os resultados indicaram que a cobertura florestal passou de 8,6% para 11,6% e 14,3% da área total da microrregião Serras do Sudeste, entre os anos 2000, 2004 e 2008. Na Campanha Meridional, a expansão da cobertura florestal passou de 11,1% para 11,2% e 11,5% da área total no mesmo período. Conclui-se que imagens MOD13Q1, de baixa resolução espacial (250 m, podem ser usadas em grandes áreas para mapear florestas e os demais temas adequadamente.

  18. Quantum Temporal Imaging

    OpenAIRE

    Tsang, Mankei; Psaltis, Demetri

    2006-01-01

    The concept of quantum temporal imaging is proposed to manipulate the temporal correlation of entangled photons. In particular, we show that time correlation and anticorrelation can be converted to each other using quantum temporal imaging.

  19. Towards General Temporal Aggregation

    DEFF Research Database (Denmark)

    Boehlen, Michael H.; Gamper, Johann; Jensen, Christian Søndergaard

    2008-01-01

    associated with the management of temporal data. Indeed, temporal aggregation is complex and among the most difficult, and thus interesting, temporal functionality to support. This paper presents a general framework for temporal aggregation that accommodates existing kinds of aggregation, and it identifies...

  20. Algoritmo de recocido simulado para la descomposición robusta del horizonte de tiempo en problemas de planeación de producción A simulated annealing algorithm for the robust decomposition of temporal horizons in production planning problems

    Directory of Open Access Journals (Sweden)

    José Fidel Torres Delgado

    2007-06-01

    Full Text Available El problema de la descomposición robusta del horizonte de tiempo en planeación de producción fue inicialmente tratado en [1]. Posteriormente, en [2], Torres propone partir de una solución entera encontrada por programación dinámica, para luego mejorarla mediante un algoritmo de recocido simulado(simulated annealing. De acuerdo con [2], es necesario investigar más a fondo la capacidad de este algoritmo para mejorar la solución inicial y el impacto de la selección de los parámetros de control del algoritmo sobre la calidad de las soluciones encontradas. En este trabajo se desarrolla esta propuesta de analizar más a fondo la capacidad del algoritmo de recocido simulado para mejorar la solución inicial. Como resultado de los experimentos computacionales realizados, se determinó que el método de enfriamiento y la tasa de enfriamiento tienen efecto significativo en la calidad de la solución final. De igual manera se estableció que la solución depende en gran medida de las características del plan de operaciones, encontrándose mejores soluciones para planes con horizontes de tiempo más cortos.The problem of robust decomposition of temporal horizons in production planning was first introduced by Torres [1]. Later, in [2], Torres suggests to start with an integer solution found by dynamic programming, and then to use a simulated annealing algorithm to improve it. According to [2], more needs to be known about the impact of the control parameters in the simulated annealing algorithm, and their sensitivity with respect to the quality of the solutions. In this work we develop this idea and analyze in depth the ability of the simulated annealing algorithm to improve the initial solution. As a result of the computational experiments conducted, we determined that the cooling scheme and the cooling rate have significant effect on the quality of the final solution. It was also established that the solution found depends strongly on the

  1. Diseño de un sistema de análisis temporal y espectral para detectar fallas por vibración en motores eléctricos

    Directory of Open Access Journals (Sweden)

    Francisco Ernesto Moreno-García

    2014-12-01

    Full Text Available El documento se basa en el desarrollo experimental de un sistema de medición y análisis de vibraciones para brindar un estudio de las más relevantes variables utilizadas en el análisis espectral de motores eléctricos, con el fin de detectar posibles fallas. Dicho sistema de análisis fue implementado en un banco de pruebas elaborado por el Grupo de Investigación en Automatización y Control (GIAC, de la Universidad Francisco de Paula Santander.

  2. Epilepsia temporal: relato de caso = Temporal epilepsy: case report

    Directory of Open Access Journals (Sweden)

    Souza, Taís Amara da Costa de

    2006-01-01

    Full Text Available Este trabalho tem o objetivo de divulgar um recurso terapêutico da epilepsia do lobo temporal por esclerose hipocampal: a cirurgia. Aproximadamente vinte e cinco mil pacientes com esta patologia são refratários aos tratamentos medicamentosos no sul do país e muitos chegam ao neurocirurgião com 30-40 anos de evolução, muitas vezes já mutilados em conseqüência das crises. Convulsões parciais originadas no lobo temporal são comuns, e grande parte originam-se em estruturas mesiais (esclerose mesial temporal – EMT. Como aí se encontram a sede de funções nobres do sistema nervoso – memória, aprendizagem, comportamento, entre outras –, os sintomas podem apresentar-se como alterações em qualquer uma delas. Ressaltamos a necessidade do correto diagnóstico e dos métodos para fazê-lo: através da anamnese, da ressonância magnética, do eletroencefalograma (EEG, do vídeo-EEG e por vezes através de sensores intracranianos (strips. Apesar de existirem métodos confiáveis para realizar o diagnóstico e tratamento cirúrgico com grande índice de sucesso, a desinformação dos profissionais que atendem pacientes com EMT acerca do assunto leva ao prolongamento de tratamentos clínico ineficiente e conseqüente seqüelas físicas, psicológicas e sociais

  3. Tres aproximaciones para estimación y distribución espacio-temporal del balance hídrico: el caso de la cuenca de Cuitzeo, Michoacán, México

    Directory of Open Access Journals (Sweden)

    Alfredo Amador García

    2012-02-01

    Full Text Available La distribución espacial de la energía y los flujos de ciclo hidrológico en forma de vapor (evapotranspiración, escurrimiento e infiltración en una región, son una función de las características climáticas (precipitación, temperatura y evaporación y del paisaje (relieve, suelo y cobertura de un área y constituyen el llamado ciclo hidrológico. El modelo general de evaluación de cada uno de los compartimentos y flujos es el balance hídrico. Los métodos desarrollados para calcular el balance hídrico de una región toman como base el enfoque de transferencia de masa o el de transferencia de energía. Este trabajo se planteó como objetivo calcular, comparar y evaluar tres aproximaciones en la estimación del balance hídrico regional espacialmente distribuido en cuencas sin datos de aforos. El modelamiento espacial de las variables hidrometeorológicas se efectuó en el sistema de información geográfica ArcView 3.2, y el modelamiento de los del escurrimiento se realizó con el sistema HEC versión 3.1.0. La primera aproximación está basada en el análisis de la información registrada en las estaciones meteorológicas disponibles, estimación puntual del balance hídrico mensual conforme al método de Thornthwaite y Mather y de polígonos de Thiessen; la segunda, en el cálculo y distribución de los parámetros para la aplicación del Método de Thornthwaite y Mather; finalmente la tercera aproximación se basó en el uso de la ecuación de FAO – Penman. Se escogió a la cuenca del lago de Cuitzeo como área de aplicación de los modelos. Destaca que mediante el resultado de la 3ª aproximación el volumen anual promedio de escurrimientos corresponde a 229.05 hm3. Dicho volumen es apenas 8.5 hm3 inferior al estimado como necesario para mantener 1 m de profundidad en la extensión del cuerpo de agua del lago de Cuitzeo. Esta diferencia representa en esa misma extensión una eventual fluctuación de 3 cm en el nivel medio del

  4. Tres aproximaciones para estimación y distribución espacio-temporal del balance hídrico: el caso de la cuenca de Cuitzeo, Michoacán, México

    OpenAIRE

    Alfredo Amador García; Erna Granados López; Manuel E. Mendoza

    2012-01-01

    La distribución espacial de la energía y los flujos de ciclo hidrológico en forma de vapor (evapotranspiración), escurrimiento e infiltración en una región, son una función de las características climáticas (precipitación, temperatura y evaporación) y del paisaje (relieve, suelo y cobertura) de un área y constituyen el llamado ciclo hidrológico. El modelo general de evaluación de cada uno de los compartimentos y flujos es el balance hídrico. Los métodos desarrollados para calcular el balance ...

  5. Acesso vascular para hemodiálise com cateter temporário de duplo lúmen em cães com insuficiência renal aguda Hemodialysis vascular access with temporary double-lumen catheter in dogs with acute renal failure

    Directory of Open Access Journals (Sweden)

    Alessandra Melchert

    2008-08-01

    Full Text Available A hemodiálise é uma modalidade terapêutica que pode sustentar a vida do paciente com insuficiência renal aguda (IRA, enquanto este recupera a função renal. Para sua realização, é necessário estabelecer circulação extracorpórea, para que seja realizada a filtração do sangue, impondo a necessidade de um acesso vascular viável e eficiente. O objetivo deste estudo foi avaliar a eficiência e as complicações do acesso vascular para hemodiálise (HD, com cateter temporário de duplo lúmen inserido na veia jugular externa. Foram estudados 10 cães com IRA induzida por gentamicina, submetidos a sessões diárias de HD, com duração de uma hora, até a recuperação da função renal ou óbito. Foram realizadas 104 sessões de HD nos animais estudados, observando-se necessidade de troca do cateter em sete sessões (6,7%, devido à obstrução do lúmen do cateter em seis sessões (5,8% ou por saída acidental do mesmo em uma sessão (1,0%. Não se observou migração do cateter, infecção, hemorragia ou hematoma no local de entrada do cateter na pele, obtendo-se fluxo sanguíneo patente em 90,4% das sessões. Concluiu-se que o acesso vascular na veia jugular externa com cateter temporário de duplo-lúmen mostrou-se viável, com ocorrência de poucas complicações, sendo, portanto, indicado como forma de acesso para a circulação extracorpórea para HD em cães com IRA.Hemodialysis is a therapeutic procedure that can sustain the patient's life in acute renal failure (ARF, during the renal function recover. To perform hemodialysis (HD, an extracorporeal circulation is established to blood filtration, imposing the need of a viable and efficient vascular access. The aim of this study was to evaluate the effectiveness and complications of the HD vascular access with temporary double-lumen catheter inserted into the external jugular vein. Ten mongrel dogs with ARF, induced by gentamicin administration, were submitted to daily

  6. Seleção de progênies de erva-mate (Ilex paraguariensis St. Hill. para a produtividade, estabilidade e adaptabilidade temporal de massa foliar Selection of Erva-mate Progenies for Leaf Weight Productivity, Temporal Stability and Adaptability

    Directory of Open Access Journals (Sweden)

    José Alfredo Sturion

    2011-03-01

    Full Text Available O presente trabalho teve por objetivos selecionar progênies de erva-mate (Ilex paraguariensis St. Hil.  em Ivaí - PR, simultaneamente para estabilidade, adaptabilidade e produtividade de massa foliar,  colhidas em três safras, com base na média harmônica a performance relativa dos valores genéticos (MHPRVG, adicionalmente, comparar os resultados  com aqueles obtidos pelos métodos de Annicchiarico e  de Lin & Binns. O material genético consistiu de 25  progênies de meios-irmãos plantadas no delineamento  de blocos ao acaso, com dez repetições  e parcelas lineares de seis plantas no espaçamento de  3m x 2m. O peso de folhas foi avaliado, por árvore,  aos dois, quatro e seis anos após o plantio. Houve  uma alteração no ordenamento das progênies para a produção de massa foliar ao longo das safras. Os  métodos de Annicchiarico, Lin & Binns e MHPRVG  selecionaram, praticamente, as mesmas progênies para os três atributos considerados. Contudo, o método  HPRVG apresenta a vantagem de fornecer  resultados na própria escala e medição do caráter, os quais podem ser interpretados diretamente como  valores genéticos.
    This paper aimed to select progenies of “erva-mate” (Ilex paraguariensis St. HiI. in Ivai - PR based on leaf weight productivity, stability and adaptability across three harvests. This can be achieved by the method MHPRVG (harmonic average of relative performance of genetic values which is comparable with the methods by Annichiaricco and Lin & Binns. The genetic material was constituted by 25 half sib progenies evaluated in a complete block design with ten replicates and six plants per plot, in a 3 x 2 meters spacing. Leaf weight per tree  was evaluated at ages two, four and six years  after planting. There were some changes in progenies  ranking across harvests. The methods MHPRVG, Annichiaricco and Lin & Binns led to selection of the  same progenies, considering the three

  7. McMaster Mesonet soil moisture dataset: description and spatio-temporal variability analysis

    Directory of Open Access Journals (Sweden)

    K. C. Kornelsen

    2013-04-01

    Full Text Available This paper introduces and describes the hourly, high-resolution soil moisture dataset continuously recorded by the McMaster Mesonet located in the Hamilton-Halton Watershed in Southern Ontario, Canada. The McMaster Mesonet consists of a network of time domain reflectometer (TDR probes collecting hourly soil moisture data at six depths between 10 cm and 100 cm at nine locations per site, spread across four sites in the 1250 km2 watershed. The sites for the soil moisture arrays are designed to further improve understanding of soil moisture dynamics in a seasonal climate and to capture soil moisture transitions in areas that have different topography, soil and land cover. The McMaster Mesonet soil moisture constitutes a unique database in Canada because of its high spatio-temporal resolution. In order to provide some insight into the dominant processes at the McMaster Mesonet sites, a spatio-temporal and temporal stability analysis were conducted to identify spatio-temporal patterns in the data and to suggest some physical interpretation of soil moisture variability. It was found that the seasonal climate of the Great Lakes Basin causes a transition in soil moisture patterns at seasonal timescales. During winter and early spring months, and at the meadow sites, soil moisture distribution is governed by topographic redistribution, whereas following efflorescence in the spring and summer, soil moisture spatial distribution at the forested site was also controlled by vegetation canopy. Analysis of short-term temporal stability revealed that the relative difference between sites was maintained unless there was significant rainfall (> 20 mm or wet conditions a priori. Following a disturbance in the spatial soil moisture distribution due to wetting, the relative soil moisture pattern re-emerged in 18 to 24 h. Access to the McMaster Mesonet data can be provided by visiting www.hydrology.mcmaster.ca/mesonet.

  8. Análise espaço-temporal da evapotranspiração de referência para Minas Gerais Spatial-time analysis of evapotranspiration reference in the Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    Luis César de Aquino Lemos Filho

    2007-10-01

    Full Text Available Objetivou-se com esta pesquisa, analisar a demanda hídrica em Minas Gerais, representada pela evapotranspiração de referência (ET0, durante o ano. Os valores de ET0 foram estimados pelo método de Penman-Monteith-FAO a partir de dados diários originados de registros de 42 estações climatológicas do Instituto Nacional de Meteorologia (INMET referentes a um período de 17 anos (1961 a 1978. No geral, os resultados mostraram que a ET0 é bastante variável em Minas Gerais, chegando a apresentar valores médios de 914 até valores de 1.677 mm ano-1. As maiores variações, tanto espaciais como temporais, são registradas no norte do Estado, onde também ocorrem os maiores valores de ET0. O Estado de Minas Gerais apresenta um déficit hídrico anual em aproximadamente 50% de sua área total. Os meses que apresentaram as maiores e menores demandas hídricas no Estado foram janeiro e junho, respectivamente. Em função da nítida distinção que apresentaram os dados de ET0 geoespacializados nas regiões do Estado de Minas Gerais, o conhecimento do correto valor da ET0 em cada localidade trará benefícios aos produtores no manejo da irrigação.The knowledge of information that expresses the water requirement of the plants is a fundamental issue for the irrigation process. The objective of this research was to analyze the water requirement in Minas Gerais State, Brazil, represented by the evapotranspiration reference (ET0, during the year. The ET0 values were estimated through the Penman-Monteith-FAO method starting from daily data originated by the registration of 42 climatological stations of the Instituto Nacional de Meteorologia (INMET referring to a period of 17 years (1961 to 1978. In general, the results showed that the evapotranspiration reference is plenty variable in Minas Gerais, reaching medium values from 914 to 1.677 mm year-1. The largest variations, such as spatial and temporal, are registered in the north part of the State

  9. Advances in temporal logic

    CERN Document Server

    Fisher, Michael; Gabbay, Dov; Gough, Graham

    2000-01-01

    Time is a fascinating subject that has captured mankind's imagination from ancient times to the present. It has been, and continues to be studied across a wide range of disciplines, from the natural sciences to philosophy and logic. More than two decades ago, Pnueli in a seminal work showed the value of temporal logic in the specification and verification of computer programs. Today, a strong, vibrant international research community exists in the broad community of computer science and AI. This volume presents a number of articles from leading researchers containing state-of-the-art results in such areas as pure temporal/modal logic, specification and verification, temporal databases, temporal aspects in AI, tense and aspect in natural language, and temporal theorem proving. Earlier versions of some of the articles were given at the most recent International Conference on Temporal Logic, University of Manchester, UK. Readership: Any student of the area - postgraduate, postdoctoral or even research professor ...

  10. Dysfunction of the temporalis muscle after pterional craniotomy for intracranial aneurysms: comparative, prospective and randomized study of one flap versus two flaps dieresis Disfunção do músculo temporal após craniotomia pterional para tratamento de aneurismas intracranianos: estudo comparativo, prospectivo e aleatório da diérese em camada única versus camada dupla

    Directory of Open Access Journals (Sweden)

    FRANCISCO CARLOS DE ANDRADE JR.

    1998-06-01

    foram avaliados antes e após cirurgia, com exame neurológico especialmente orientado para o V e VII pares de nervos cranianos, medida do diâmetro bi-temporal, simetria das regiões temporais, movimentação da articulação temporomandibular (ATM e tomografia computadorizada de crânio. A ATM foi avaliada em relação a dor articular pós-operatória, limitação dos movimentos a mastigação, oclusão, abertura da boca e movimentos laterais da mandíbula. A análise estatística mostrou que a incidência de dor na ATM e atrofia temporal moderada e grave, comparando MC com IF, houve diferenças significativas entre estes, sendo maior no grupo IF. Concluimos que ambas técnicas permitem acessos equivalentes aos aneurismas estudados, mas a atrofia do músculo temporal, a dor e limitações dos movimentos da ATM foi prevalente, pior e mais duradoura na diérese IF que na diérese MC.

  11. Indeterministic Temporal Logic

    Directory of Open Access Journals (Sweden)

    Trzęsicki Kazimierz

    2015-09-01

    Full Text Available The questions od determinism, causality, and freedom have been the main philosophical problems debated since the beginning of temporal logic. The issue of the logical value of sentences about the future was stated by Aristotle in the famous tomorrow sea-battle passage. The question has inspired Łukasiewicz’s idea of many-valued logics and was a motive of A. N. Prior’s considerations about the logic of tenses. In the scheme of temporal logic there are different solutions to the problem. In the paper we consider indeterministic temporal logic based on the idea of temporal worlds and the relation of accessibility between them.

  12. Chondroblastoma of temporal bone

    Energy Technology Data Exchange (ETDEWEB)

    Tanohta, K.; Noda, M.; Katoh, H.; Okazaki, A.; Sugiyama, S.; Maehara, T.; Onishi, S.; Tanida, T.

    1986-07-01

    The case of a 55-year-old female with chondroblastoma arising from the left temporal bone is presented. Although 10 cases of temporal chondroblastoma have been reported, this is the first in which plain radiography, pluridirectional tomography, computed tomography (CT) and angiography were performed. We discuss the clinical and radiological aspects of this rare tumor.

  13. Chondroblastoma of temporal bone

    International Nuclear Information System (INIS)

    Tanohta, K.; Noda, M.; Katoh, H.; Okazaki, A.; Sugiyama, S.; Maehara, T.; Onishi, S.; Tanida, T.

    1986-01-01

    The case of a 55-year-old female with chondroblastoma arising from the left temporal bone is presented. Although 10 cases of temporal chondroblastoma have been reported, this is the first in which plain radiography, pluridirectional tomography, computed tomography (CT) and angiography were performed. We discuss the clinical and radiological aspects of this rare tumor. (orig.)

  14. Contrato de trabajo y empresas de trabajo temporal

    OpenAIRE

    Chacartegui Jávega, Consuelo

    1998-01-01

    Las empresas de trabajo temporal se legalizan en España en el año 1994. A partir de ese momento constituyen un recurso frecuentemente utilizado para llevar a cabo la externalización del trabajo, como proceso que caracteriza en la actualidad a las nuevas formas complejas de organización empresarial. En la tesis se analizan los efectos que ello tiene para los derechos de los trabajadores y cómo se afrontan las responsabilidades empresariales cuando entra en juego una empresa de trabajo temporal...

  15. Otosclerosis: Temporal Bone Pathology.

    Science.gov (United States)

    Quesnel, Alicia M; Ishai, Reuven; McKenna, Michael J

    2018-04-01

    Otosclerosis is pathologically characterized by abnormal bony remodeling, which includes bone resorption, new bone deposition, and vascular proliferation in the temporal bone. Sensorineural hearing loss in otosclerosis is associated with extension of otosclerosis to the cochlear endosteum and deposition of collagen throughout the spiral ligament. Persistent or recurrent conductive hearing loss after stapedectomy has been associated with incomplete footplate fenestration, poor incus-prosthesis connection, and incus resorption in temporal bone specimens. Human temporal bone pathology has helped to define the role of computed tomography imaging for otosclerosis, confirming that computed tomography is highly sensitive for diagnosis, yet limited in assessing cochlear endosteal involvement. Copyright © 2017 Elsevier Inc. All rights reserved.

  16. Cierre temprano de colostomia temporal

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    Estrella Celeste Uzcátegui Paz

    2012-12-01

    Full Text Available La colostomía es un procedimiento que es necesario en ocasiones para derivar el colon por patologías inflamatorias, heridas por traumas o tumores que solventara de forma inmediata el problema. Sin embargo causa morbilidad, rechazo social, retardo en la reinserción laboral y una afección psicológica considerable por lo que planteamos evaluar los resultados del cierre temprano de una colostomía temporal a través de un estudio observacional prospectivo analítico en 67 pacientes del Instituto Autónomo Hospital Universitario de Los Andes entre enero 2009 a octubre 2011. Agrupados en control (pacientes con cierre tardío, luego del mes y casos (cierre temprano antes de los 30 días. En nuestros resultados encontramos que de los 67 cierres de colostomías realizados 31 fueron cierre temprano y 36 tardío, existiendo como promedio de edad 37 años con predominio del sexo masculino, explicado por la indicación más frecuente de colostomía en la actualidad, como es el trauma abdominal. No hubo diferencia estadísticamente significativa en ambos grupos con respecto a las complicaciones postoperatorias como dehiscencia de sutura y el desarrollo de una fístula, sin embargo en cuanto al desarrollo de absceso de pared sí, con 31 casos de los 36 pacientes en el grupo control y sólo 2 para el grupo casos. Así mismo para la estancia hospitalaria y la reinserción laboral al mes con un 71% para el grupo de cierre temprano y 27,7% para el cierre tardío. Concluyéndose que el cierre temprano de una colostomía temporal es un procedimiento seguro que no aumenta la morbilidad, acorta la estancia hospitalaria con obvias ventajas en la rehabilitación, reinserción laboral y disminución en la afección psicológica del paciente. Palabras clave: Colostomía, cierre temprano, cierre tardío. Early closure of temporary diversion colostomy Abstract Colostomy is a surgical procedure to diverse colonic transit, which is performed in inflammatory diseases

  17. Nontraumatic temporal subcortical hemorrhage

    International Nuclear Information System (INIS)

    Weisberg, L.A.; Stazio, A.; Shamsnia, M.; Elliott, D.; Charity Hospital, New Orleans, LA

    1990-01-01

    Thirty patients with temporal hematomas were analyzed. Four with frontal extension survived. Of 6 with ganglionic extension, three had residual deficit. Of 8 with parietal extension, 4 had delayed deterioration and died, two patients recovered, and two with peritumoral hemorrhage due to glioblastoma multiforme died. Five patients with posterior temporal hematomas recovered. In 7 patients with basal-inferior temporal hematomas, angiography showed aneurysms in 3 cases, angiomas in 2 cases and no vascular lesion in 2 cases. Of 23 cases with negative angiography and no systemic cause for temporal hematoma, 12 patients were hypertensive and 11 were normotensive. Ten hypertensive patients without evidence of chronic vascular disease had the largest hematomas, extending into the parietal or ganglionic regions. Seven of these patients died; 3 had residual deficit. Eleven normotensive and two hypertensive patients with evidence of chronic vascular change had smaller hematomas. They survived with good functional recovery. (orig.)

  18. Temporal Lobe Seizure

    Science.gov (United States)

    ... functions, including having odd feelings — such as euphoria, deja vu or fear. Temporal lobe seizures are sometimes called ... sudden sense of unprovoked fear or joy A deja vu experience — a feeling that what's happening has happened ...

  19. SHEEP TEMPORAL BONE

    Directory of Open Access Journals (Sweden)

    Kesavan

    2016-03-01

    Full Text Available INTRODUCTION Human temporal bones are difficult to procure now a days due to various ethical issues. Sheep temporal bone is a good alternative due to morphological similarities, easy to procure and less cost. Many middle ear exercises can be done easily and handling of instruments is done in the procedures like myringoplasty, tympanoplasty, stapedotomy, facial nerve dissection and some middle ear implants. This is useful for resident training programme.

  20. Caracterização física de dois substratos orgânicos para plantas e a estimativa da umidade por meio da reflectometria no domínio do tempo Physical characterization of two organic substrates for plants and the estimate of water content through the time domain reflectometry

    Directory of Open Access Journals (Sweden)

    Roger Manuel Mestas Valero

    2009-04-01

    Full Text Available O crescente uso de substratos na produção agrícola e no cultivo em ambiente protegido, promove produção em grande escala. Nesse sentido, as caracterizações químicas, biológicas e físicas desses materiais se fazem necessárias à proposição e à avaliação de padrões de qualidade que devem preceder a sua comercialização. As propriedades físicas dos substratos influenciam no bom desenvolvimento da plantas, sobretudo, no manejo de irrigação, onde a compreensão da relação retenção de água e aeração é imprescindível. Para tanto, mostra-se necessário que também se determine o volume de água presente nos substratos utilizados. Nesse sentido, o uso da reflectometria no domínio do tempo (TDR pode representar um avanço em estudos dessa natureza. Dessa forma, baseado na determinação das curvas de retenção de água, neste trabalho, foram feitas as caracterizações físicas de dois substratos orgânicos: casca de pinus e fibra de coco. Também foram ajustadas, para cada um dos substratos avaliados, uma curva de calibração, através da qual, por meio da técnica da TDR, estimou-se o seu conteúdo de água. De maneira geral, com exceção da densidade seca, os substratos em estudo apresentaram características físicas da relação ar-água muito semelhantes. Quando comparado com os valores obtidos pelo método gravimétrico, na faixa de água facilmente disponível, a técnica da TDR apresentou um bom desempenho na estimativa da umidade de ambos substratos apresentando um coeficiente de determinação de 0,9319 para a casca de pinus e de 0,9385 para a fibra de coco.The increasing use of substrates on agricultural production and controlled environment has been promoting its large scale production. In this way, chemical, biological and physical characterizations of these materials are necessary to the quality standard proposal and evaluation which must precede its commercialization. High plants development has been

  1. Investigação da temporalidade das características definidoras do diagnóstico de resposta disfuncional ao desmame ventilatório La investigación de la temporalidad de las características definitorias de diagnóstico de la respuesta disfuncional para el destete ventilatorio Investigation of the temporality of the defining characteristics of the diagnostic response to dysfunctional ventilatory weaning

    Directory of Open Access Journals (Sweden)

    Fernanda Avellar Cerqueira

    2012-09-01

    Full Text Available Estudo que investigou a distribuição temporal das características definidoras da Resposta Disfuncional ao Desmame Ventilatório. Teve como objetivos: descrever a conformação da distribuição cronológica das características definidoras desse diagnóstico em pacientes sob ventilação prolongada na fase de interrupção da ventilação mecânica e verificar a existência de um padrão temporal predominante. Trata-se de um estudo do tipo descritivo-exploratório com abordagem quantitativa. Foram sujeitos os clientes adultos internados por causas clínicas no Centro de Terapia Intensiva do Hospital Pró-Cardíaco, sob ventilação mecânica prolongada e que estavam em desmame. Com os resultados se obteve a confirmação da hipótese de existência de uma distribuição temporal predominante na amostra observada. Foi possível distinguir os principais intervalos de observação/manifestação das Características Definidoras, a saber: precoce, intermediário e tardio. Em relação ao gerenciamento do processo de desmame foi possível indicar algumas contribuições ao aprimoramento das avaliações protocolares.Un estudio investigó la distribución temporal de las características definitorias de Respuesta Disfuncional al Destete Ventilatorio. Tuvo como objetivo describir la conformación de la distribución cronológica de las características definitorias de este diagnóstico en pacientes sometidos a ventilación prolongada durante el destete de la ventilación mecánica y para verificar la existencia de un patrón climático predominante. Se trata de un estudio descriptivo de enfoque cuantitativo y exploratorio. Los sujetos fueron clientes adultos ingresados por razones clínicas en la Unidad de Cuidados Intensivos del Hospital Pro-cardiaco, bajo ventilación mecánica prolongada y que habían de ser destetados. Con los resultados se obtuvo la confirmación de la hipótesis de una distribución temporal que prevalecen en la muestra

  2. para palmito

    Directory of Open Access Journals (Sweden)

    Francisco Paulo Chaimsohn

    2007-01-01

    Full Text Available Densidades de siembra, arreglos espaciales y fertilización en pejibaye (Bactris gasipaes cv Diamantes-10 para palmito. La investigación se llevó a cabo en la Estación Experimental Los Diamantes (Guápiles, Costa Rica, el 3 de octubre del 2003, cuyo objetivo fue la evaluación del efecto de diferentes densidades de siembra (3.333, 5.000 y 6.666 plantas/ha, arreglos espaciales, y diversos métodos de fertilización (química, orgánica, sobre el crecimiento de las plantas de pejibaye para producción de palmito. Se consideraron las variables diámetro y altura del tallo primario y el número de hojas y rebrotes como indicadores de producción. El período de evolución abarcó sólo los primeros 25 meses de crecimiento en el campo. El número de hojas, la altura y el diámetro del tallo no mostraron diferencias de respuesta relevantes. Sólo el número de rebrotes disminuyó al aumentar la densidad de la población, cuando se midió a los 15 meses de edad. El efecto de la fertilización se hizo evidente después de la primera cosecha, realizada a los 20 meses, debido al aumento de la competencia entre plantas, ahora más desarrolladas. Fue entonces cuando la fertilización química indujo la producción de un mayor número y vigor de los rebrotes. Sin embargo, las prácticas evaluadas 25 meses después de la siembra, no habían infl uido hasta ese momento en el número de palmitos cosechados, ni tampoco había afectado las características físicas de los sectores foliar y caulinar del palmito.

  3. Olivine-hornblende-lamprophyre dikes from Quebrada los Sapos, El Teniente, Central Chile (34°S: implications for the temporal geochemical evolution of the Andean subarc mantle Diques lamprofídicos de olivino-hornblenda de la quebrada los Sapos, El Teniente, Chile central (34°S: implicancias para la evolución temporal de la geoquímica del manto subarco Andino

    Directory of Open Access Journals (Sweden)

    Charles R Stern

    2011-01-01

    al este del arco magmático durante el Plioceno. Los lamprófidos menos primitivos, sin olivino, tienen contenidos más altos de La y menores de Yb, con razones más altas de La/Yb entre 15-44, debido al fraccionamiento cristal-líquido el cual involucra hornblenda, pero no plagioclasa. La cristalización de la plagioclasa es inhibida por el alto contenido de H2O de los lamprófidos. Los lamprófidos y los flujos más jóvenes, del Plioceno (1,8-2,3 Ma, de lavas andesíticas-basálticas con olivino del valle del río Cachapoal tienen razones de 87Sr/86Sr entre 0,7041 y 0,7049, C Nd entre +1,2 y -1,1 y de 206Pb/204Pb entre 18,60 a 18,68, mientras que las rocas ígneas del Mioceno Medio a Superior (6,5-13,9 Ma del Complejo Volcánico y Plutónico de El Teniente tienen razones más bajas de 87Sr/86Sr=0,7039 a 0,7041 y de 206Pb/204Pb= 18,56 a 18,59, y más altas de o = +1,9 y +3,8. Las rocas volcánicas y plutónicas del Oligoceno al Mioceno Inferior (>15 Ma de la Formación Abanico o Coya-Machalí en la región tienen razones aún más bajas de 87Sr/86Sr entre 0,7033 a 0,7039 y de 206Pb/204Pb entre 18,45 a 18,57, y C Nd aún más alto entre +3,8 y +6,2. La información isotópica indica una evolución temporal entre el Oligoceno y el Plioceno hacia razones más altas de 87Sr/86Sr y 206Pb/204Pb, y valores de más bajos para los magmas máficos derivados del manto y, por lo tanto, de su fuente en el manto. Notablemente las razones isotópicas de Sr, Nd y Pb son independientes del contenido de SiO2 de las rocas de cada edad, lo que excluye contaminación por la corteza continental del Paleozoico y Mesozoico, la cual es isotópicamente heterogénea, durante la evolución de las rocas intermedias a acidas generadas por los magmas máficos derivados del manto. La evolución isotópica de la fuente de magmas máficos en el manto durante el Oligoceno al Plioceno puede ser explicada por el aumento de 1% a 6% de contaminación en la region fuente de manto por material subductado

  4. Temporal network epidemiology

    CERN Document Server

    Holme, Petter

    2017-01-01

    This book covers recent developments in epidemic process models and related data on temporally varying networks. It is widely recognized that contact networks are indispensable for describing, understanding, and intervening to stop the spread of infectious diseases in human and animal populations; “network epidemiology” is an umbrella term to describe this research field. More recently, contact networks have been recognized as being highly dynamic. This observation, also supported by an increasing amount of new data, has led to research on temporal networks, a rapidly growing area. Changes in network structure are often informed by epidemic (or other) dynamics, in which case they are referred to as adaptive networks. This volume gathers contributions by prominent authors working in temporal and adaptive network epidemiology, a field essential to understanding infectious diseases in real society.

  5. Temporal Concurrent Constraint Programming

    DEFF Research Database (Denmark)

    Valencia, Frank Dan

    Concurrent constraint programming (ccp) is a formalism for concurrency in which agents interact with one another by telling (adding) and asking (reading) information in a shared medium. Temporal ccp extends ccp by allowing agents to be constrained by time conditions. This dissertation studies...... temporal ccp by developing a process calculus called ntcc. The ntcc calculus generalizes the tcc model, the latter being a temporal ccp model for deterministic and synchronouss timed reactive systems. The calculus is built upon few basic ideas but it captures several aspects of timed systems. As tcc, ntcc...... structures, robotic devises, multi-agent systems and music applications. The calculus is provided with a denotational semantics that captures the reactive computations of processes in the presence of arbitrary environments. The denotation is proven to be fully-abstract for a substantial fragment...

  6. VT Data - TDR Overlay District 20130305, Dover

    Data.gov (United States)

    Vermont Center for Geographic Information — This file, along with two others, was created to produce a new, official zoning map series for the Town of Dover, Vermont in 2007. This file represents the Transfer...

  7. Empresas de trabajo temporal

    OpenAIRE

    Chico Abad, Virginia

    2015-01-01

    Las empresas de trabajo temporal han ido tomando mayor relevancia debido a la estructura de la sociedad y de la economía. La entrada en vigor de la ley 14/1994 por la que se regulan las empresas de trabajo temporal suposo la incorporación al ordenamiento jurífico español de un tipo de empresas cuya actuación se habia extendido en otros países del entorno europeo. La idea general gira en torno a la flexibilidad de un nuevo marco económico y organizativo y exige a las empresas una capa...

  8. Medial temporal lobe

    International Nuclear Information System (INIS)

    Silver, A.J.; Cross, D.T.; Friedman, D.P.; Bello, J.A.; Hilal, S.K.

    1989-01-01

    To better define the MR appearance of hippocampal sclerosis, the authors have reviewed over 500 MR coronal images of the temporal lobes. Many cysts were noted that analysis showed were of choroid-fissure (arachnoid) origin. Their association with seizures was low. A few nontumorous, static, medial temporal lesions, noted on T2-weighted coronal images, were poorly visualized on T1-weighted images and did not enhance with gadolinium. The margins were irregular, involved the hippocampus, and were often associated with focal atrophy. The lesions usually were associated with seizure disorders and specific electroencephalographic changes, and the authors believe they represented hippocampal sclerosis

  9. Variação temporal e espacial de ovos e de larvas das espécies de interesse para a pesca na sub-bacia do rio Miranda, Pantanal, Estado do Mato Grosso do Sul, Brasil - DOI: 10.4025/actascibiolsci.v27i3.1314 Temporal and spatial variation of fish eggs and larvae of the main exploited species in the sub-basin of Miranda River, Pantanal wetland, State of Mato Grosso do Sul, Brazil - DOI: 10.4025/actascibiolsci.v27i3.1314

    Directory of Open Access Journals (Sweden)

    Keshyiu Nakatani

    2005-03-01

    Full Text Available Foi analisada a variação temporal de ovos e de larvas das principais espécies exploradas no Pantanal: Piaractus mesopotamicus; Prochilodus lineatus; Salminus maxillosus; Leporinus macrocephalus e Pseudoplatystoma spp., no rio Miranda. As coletas foram realizadas nos meses de outubro a março, quinzenalmente, de 1996 a 1999. O rio foi dividido em trecho superior, médio e inferior, com 15 pontos de coleta. Foram utilizadas rede de plâncton cônico-cilindrica, com fluxômetro, e as amostras fixadas em formol 4%. Para a identificação, utilizaram-se características morfológicas e merísticas, grau de flexão da notocorda e elementos da nadadeira caudal. No primeiro período, foram capturadas 5.979 larvas e 1.075 ovos; no segundo, 108.912 larvas e 1.836 ovos; no terceiro, 13.465 larvas e 1.855 ovos. A ANOVA, entre os anos e trechos do rio, foi significativa (F= 6.5, p >0,05 no trecho médio, indicando que a reprodução ocorre do trecho médio para o superior, nos meses de novembro a janeiroThe aim of this study was to analyze temporal variation of fish eggs and larvae of the main exploited species in Miranda river, Pantanal wetland (Piaractus mesopotamicus, Prochilodus lineatus, Salminus maxillosus, Leporinus macrocephalus, and Pseudoplatystoma spp., which were collected from October to March, biweekly, from 1996 to 1999. The river was divided into superior, medium and inferior sections, of 15 collection sites. Conical-cylindrical plankton net with a fluxometer and samples fixed in formol 4% were utilized. Morphological and meristic characteristics, notochord flexion degree and caudal fin elements were utilized for identification. A total of 5,979 larvae and 1,075 eggs were collected in the first period; 108,912 larvae and 1,836 eggs in the second; 13,465 larvae and 1,855 eggs in the third. Results showed that ANOVA, between the years and the river stretches, was significant (F = 6.5, p >0.05 in the medium section, which indicates that the

  10. Optimizing Temporal Queries

    DEFF Research Database (Denmark)

    Toman, David; Bowman, Ivan Thomas

    2003-01-01

    Recent research in the area of temporal databases has proposed a number of query languages that vary in their expressive power and the semantics they provide to users. These query languages represent a spectrum of solutions to the tension between clean semantics and efficient evaluation. Often, t...

  11. Temporal Concurrent Constraint Programming

    DEFF Research Database (Denmark)

    Nielsen, Mogens; Palamidessi, Catuscia; Valencia, Frank Dan

    2002-01-01

    The ntcc calculus is a model of non-deterministic temporal concurrent constraint programming. In this paper we study behavioral notions for this calculus. In the underlying computational model, concurrent constraint processes are executed in discrete time intervals. The behavioral notions studied...

  12. Temporal Photon Differentials

    DEFF Research Database (Denmark)

    Schjøth, Lars; Frisvad, Jeppe Revall; Erleben, Kenny

    2010-01-01

    The finite frame rate also used in computer animated films is cause of adverse temporal aliasing effects. Most noticeable of these is a stroboscopic effect that is seen as intermittent movement of fast moving illumination. This effect can be mitigated using non-zero shutter times, effectively...

  13. Temporal compressive sensing systems

    Science.gov (United States)

    Reed, Bryan W.

    2017-12-12

    Methods and systems for temporal compressive sensing are disclosed, where within each of one or more sensor array data acquisition periods, one or more sensor array measurement datasets comprising distinct linear combinations of time slice data are acquired, and where mathematical reconstruction allows for calculation of accurate representations of the individual time slice datasets.

  14. Information and Temporality

    Directory of Open Access Journals (Sweden)

    Christian Flender

    2016-09-01

    Full Text Available Being able to give reasons for what the world is and how it works is one of the defining characteristics of modernity. Mathematical reason and empirical observation brought science and engineering to unprecedented success. However, modernity has reached a post-state where an instrumental view of technology needs revision with reasonable arguments and evidence, i.e. without falling back to superstition and mysticism. Instrumentally, technology bears the potential to ease and to harm. Easing and harming can't be controlled like the initial development of technology is a controlled exercise for a specific, mostly easing purpose. Therefore, a revised understanding of information technology is proposed based upon mathematical concepts and intuitions as developed in quantum mechanics. Quantum mechanics offers unequaled opportunities because it raises foundational questions in a precise form. Beyond instrumentalism it enables to raise the question of essences as that what remains through time what it is. The essence of information technology is acausality. The time of acausality is temporality. Temporality is not a concept or a category. It is not epistemological. As an existential and thus more comprehensive and fundamental than a concept or a category temporality is ontological; it does not simply have ontic properties. Rather it exhibits general essences. Datability, significance, spannedness and openness are general essences of equiprimordial time (temporality.

  15. Temporal logic motion planning

    CSIR Research Space (South Africa)

    Seotsanyana, M

    2010-01-01

    Full Text Available In this paper, a critical review on temporal logic motion planning is presented. The review paper aims to address the following problems: (a) In a realistic situation, the motion planning problem is carried out in real-time, in a dynamic, uncertain...

  16. Experimental temporal quantum steering

    Czech Academy of Sciences Publication Activity Database

    Bartkiewicz, K.; Černoch, Antonín; Lemr, K.; Miranowicz, A.; Nori, F.

    2016-01-01

    Roč. 6, Nov (2016), 1-8, č. článku 38076. ISSN 2045-2322 R&D Projects: GA ČR GAP205/12/0382 Institutional support: RVO:68378271 Keywords : temporal quantum steering * EPR steering Subject RIV: BH - Optics, Masers, Lasers Impact factor: 4.259, year: 2016

  17. Communication, Technology, Temporality

    Directory of Open Access Journals (Sweden)

    Mark A. Martinez

    2012-08-01

    Full Text Available This paper proposes a media studies that foregrounds technological objects as communicative and historical agents. Specifically, I take the digital computer as a powerful catalyst of crises in communication theories and certain key features of modernity. Finally, the computer is the motor of “New Media” which is at once a set of technologies, a historical epoch, and a field of knowledge. As such the computer shapes “the new” and “the future” as History pushes its origins further in the past and its convergent quality pushes its future as a predominate medium. As treatment of information and interface suggest, communication theories observe computers, and technologies generally, for the mediated languages they either afford or foreclose to us. My project describes the figures information and interface for the different ways they can be thought of as aspects of communication. I treat information not as semantic meaning, formal or discursive language, but rather as a physical organism. Similarly an interface is not a relationship between a screen and a human visual intelligence, but is instead a reciprocal, affective and physical process of contact. I illustrate that historically there have been conceptions of information and interface complimentary to mine, fleeting as they have been in the face of a dominant temporality of mediation. I begin with a theoretically informed approach to media history, and extend it to a new theory of communication. In doing so I discuss a model of time common to popular, scientific, and critical conceptions of media technologies especially in theories of computer technology. This is a predominate model with particular rules of temporal change and causality for thinking about mediation, and limits the conditions of possibility for knowledge production about communication. I suggest a new model of time as integral to any event of observation and analysis, and that human mediation does not exhaust the

  18. Imaging of limbic para-neoplastic encephalitis

    International Nuclear Information System (INIS)

    Rimmelin, A.; Sellat, F.; Morand, G.; Quoix, E.; Clouet, P.L.; Dietemann, J.L.

    1997-01-01

    Para-neoplastic limbic encephalitis is a rare syndrome mostly associated with small cell lung cancer. We present the case of a 69-year-old man with selective amnesia suggesting limbic encephalitis. A neuroendocrine cell lung cancer was found, confirming the diagnostics of para-neoplastic limbic encephalitis. Contrast-enhanced cerebral CT was normal whether magnetic resonance imaging showed signal abnormalities of the medial part of temporal lobes and hippocampal regions. Because neurologic improvement may follow treatment of the primary tumor, early diagnosis is important. (authors)

  19. ADHD and temporality

    DEFF Research Database (Denmark)

    Nielsen, Mikka

    According to the official diagnostic manual, ADHD is defined by symptoms of inattention, hyperactivity, and impulsivity and patterns of behaviour are characterized as failure to pay attention to details, excessive talking, fidgeting, or inability to remain seated in appropriate situations (DSM-5......). In this paper, however, I will ask if we can understand what we call ADHD in a different way than through the symptom descriptions and will advocate for a complementary, phenomenological understanding of ADHD as a certain being in the world – more specifically as a matter of a phenomenological difference...... in temporal experience and/or rhythm. Inspired by both psychiatry’s experiments with people diagnosed with ADHD and their assessment of time and phenomenological perspectives on mental disorders and temporal disorientation I explore the experience of ADHD as a disruption in the phenomenological experience...

  20. Temporal Concurrent Constraint Programming

    DEFF Research Database (Denmark)

    Nielsen, Mogens; Valencia Posso, Frank Dan

    2002-01-01

    The ntcc calculus is a model of non-deterministic temporal concurrent constraint programming. In this paper we study behavioral notions for this calculus. In the underlying computational model, concurrent constraint processes are executed in discrete time intervals. The behavioral notions studied...... reflect the reactive interactions between concurrent constraint processes and their environment, as well as internal interactions between individual processes. Relationships between the suggested notions are studied, and they are all proved to be decidable for a substantial fragment of the calculus...

  1. Uso de nuevas herramientas para el control de triatominos en diferentes situaciones entomológicas en el continente americano

    Directory of Open Access Journals (Sweden)

    Oliveira Filho Alfredo M.

    1997-01-01

    Full Text Available Se relatan los resultados obtenidos en el terreno seis meses y dos años post-tratamiento con las nuevas herramientas para el control de triatominos desarrolladas con apoyo de la OMS/TDR, o sea, a pinturas insecticidas, una suspensión emulsionable de lenta liberación conteniendo el 8,3% de malathion, aplicada por rociamiento; b potes fumígenos que, después de encendidos, echan humos que contienen cypermetrina y DDVP; c cajas sensoras para detección de triatominos. Los ensayos en el terreno fueron realizados en Chile, Honduras y Paraguay contra tres especies principales de vectores de la enfermedad de Chagas - Triatoma infestans, T. dimidiata y Rhodnius prolixus, según el protocolo elaborado por un comité de expertos de la OMS. Los resultados indican que las pinturas insecticidas constituyen un eficaz medio de control de estos vectores en cualquiera de las condiciones estudiadas, sea en el domicilio, sea en el peridomicilio, manteniendo los porcentajes de infestación muy próximos a cero. Comparaciones preliminares de la técnica de cajas sensoras para detección de casas infestadas por triatominos, con la búsqueda hecha por personal entrenado (hora/hombre indican esta última como la mas apropiada.

  2. Spatio-Temporal Rule Mining

    DEFF Research Database (Denmark)

    Gidofalvi, Gyozo; Pedersen, Torben Bach

    2005-01-01

    Recent advances in communication and information technology, such as the increasing accuracy of GPS technology and the miniaturization of wireless communication devices pave the road for Location-Based Services (LBS). To achieve high quality for such services, spatio-temporal data mining techniques...... are needed. In this paper, we describe experiences with spatio-temporal rule mining in a Danish data mining company. First, a number of real world spatio-temporal data sets are described, leading to a taxonomy of spatio-temporal data. Second, the paper describes a general methodology that transforms...... the spatio-temporal rule mining task to the traditional market basket analysis task and applies it to the described data sets, enabling traditional association rule mining methods to discover spatio-temporal rules for LBS. Finally, unique issues in spatio-temporal rule mining are identified and discussed....

  3. Egocentric Temporal Action Proposals.

    Science.gov (United States)

    Shao Huang; Weiqiang Wang; Shengfeng He; Lau, Rynson W H

    2018-02-01

    We present an approach to localize generic actions in egocentric videos, called temporal action proposals (TAPs), for accelerating the action recognition step. An egocentric TAP refers to a sequence of frames that may contain a generic action performed by the wearer of a head-mounted camera, e.g., taking a knife, spreading jam, pouring milk, or cutting carrots. Inspired by object proposals, this paper aims at generating a small number of TAPs, thereby replacing the popular sliding window strategy, for localizing all action events in the input video. To this end, we first propose to temporally segment the input video into action atoms, which are the smallest units that may contain an action. We then apply a hierarchical clustering algorithm with several egocentric cues to generate TAPs. Finally, we propose two actionness networks to score the likelihood of each TAP containing an action. The top ranked candidates are returned as output TAPs. Experimental results show that the proposed TAP detection framework performs significantly better than relevant approaches for egocentric action detection.

  4. Spontaneous lateral temporal encephalocele.

    Science.gov (United States)

    Tuncbilek, Gokhan; Calis, Mert; Akalan, Nejat

    2013-01-01

    A spontaneous encephalocele is one that develops either because of embryological maldevelopment or from a poorly understood postnatal process that permits brain herniation to occur. We here report a rare case of lateral temporal encephalocele extending to the infratemporal fossa under the zygomatic arch. At birth, the infant was noted to have a large cystic mass in the right side of the face. After being operated on initially in another center in the newborn period, the patient was referred to our clinic with a diagnosis of temporal encephalocele. He was 6 months old at the time of admission. Computerized tomography scan and magnetic resonance imaging studies revealed a 8 × 9 cm fluid-filled, multiloculated cystic mass at the right infratemporal fossa. No intracranial pathology or connection is seen. The patient was operated on to reduce the distortion effect of the growing mass. The histopathological examination of the sac revealed well-differentiated mature glial tissue stained with glial fibrillary acid protein. This rare clinical presentation of encephaloceles should be taken into consideration during the evaluation of the lateral facial masses in the infancy period, and possible intracranial connection should be ruled out before surgery to avoid complications.

  5. Anatomia do osso temporal de ovelhas sob aspectos didáticos Lambs' temporal bone anatomy under didactic aspects

    Directory of Open Access Journals (Sweden)

    André Gurr

    2011-02-01

    Full Text Available É difícil encontrar ossos temporais humanos para o ensino de cirurgia otológica. Ossos temporais de ovelhas podem representar uma possível alternativa. MATERIAIS E MÉTODOS: Os ossos temporais de ovelhas foram dissecados em um programa convencional de dissecação de osso temporal no laboratório. Incluímos mastoidectomia, abordagens endaurais, mas também analisamos a aparência externa, o meato acústico externo e o hipotímpano. Algumas etapas são diferentes das preparações de ossos humanos. Os resultados morfométricos foram comparados à anatomia conhecida de humanos para verificar se o osso temporal de ovelhas seria utilizável para o ensino de cirurgia otológica. RESULTADOS: O osso temporal de ovelhas parece menor do que o humano. Encontramos uma área bolhosa se estendendo ao hipotímpano abaixo do meato acústico externo. A membrana timpânica é muito semelhante à humana. O meato acústico externo é menor e mais curto. A cadeia ossicular exibe analogias para com a humana. DISCUSSÃO: Esse estudo mostra que especificamente o ouvido médio, a membrana timpânica e o conduto auditivo externo são morfologicamente semelhantes às suas contrapartidas encontradas nos ossos temporais humanos. A ovelha parece ser um modelo viável para o ensino da anatomia do ouvido. A menor escala de algumas estruturas, especialmente dos componentes externos do osso temporal representa uma desvantagem. CONCLUSÕES: A ovelha parece representar uma alternativa viável no ensino de cirurgia otológica.Human temporal bones in teaching ear surgery are rare. The lamb's temporal bone might be a possible alternative. MATERIAL AND METHODS: Temporal bones of the lamb were dissected with a typical temporal bone lab drilling program. We included a mastoidectomy, endaural approaches, but also analyzed the outer appearance, the external ear canal and the hypotympanon. Some steps differed from preparation done in humans. The morphometric results were compared to

  6. Comportamiento de la incapacidad temporal de más de 365 días

    OpenAIRE

    Araceli López-Guillén García

    2015-01-01

    La incapacidad temporal (IT) es motivo de preocupación por los elevados (y crecientes) costos que representa para los sistemas de seguridad social, para las empresas y para la economía en general. España se caracteriza por ser el país con mayor nivel de bajas laborales entre los analizados y presenta una tendencia muy creciente en el tiempo¹. El conocimiento de las patologías que con más frecuencia derivan en procesos de IT de larga duración (al menos 365 días) nos sirve para la adecuada inte...

  7. Model Based Temporal Reasoning

    Science.gov (United States)

    Rabin, Marla J.; Spinrad, Paul R.; Fall, Thomas C.

    1988-03-01

    Systems that assess the real world must cope with evidence that is uncertain, ambiguous, and spread over time. Typically, the most important function of an assessment system is to identify when activities are occurring that are unusual or unanticipated. Model based temporal reasoning addresses both of these requirements. The differences among temporal reasoning schemes lies in the methods used to avoid computational intractability. If we had n pieces of data and we wanted to examine how they were related, the worst case would be where we had to examine every subset of these points to see if that subset satisfied the relations. This would be 2n, which is intractable. Models compress this; if several data points are all compatible with a model, then that model represents all those data points. Data points are then considered related if they lie within the same model or if they lie in models that are related. Models thus address the intractability problem. They also address the problem of determining unusual activities if the data do not agree with models that are indicated by earlier data then something out of the norm is taking place. The models can summarize what we know up to that time, so when they are not predicting correctly, either something unusual is happening or we need to revise our models. The model based reasoner developed at Advanced Decision Systems is thus both intuitive and powerful. It is currently being used on one operational system and several prototype systems. It has enough power to be used in domains spanning the spectrum from manufacturing engineering and project management to low-intensity conflict and strategic assessment.

  8. Multiple Temporalities, Layered Histories

    Directory of Open Access Journals (Sweden)

    Steven Pearson

    2017-11-01

    Full Text Available In Quotational Practices: Repeating the Future in Contemporary Art, Patrick Greaney asserts, “the past matters not only because of what actually happened but also because of the possibilities that were not realized and that still could be. Quotation evokes those possibilities. By repeating the past, artists and writers may be attempting to repeat that past’s unrealized futures.”[1]  In the information age, the Internet, for instance, provides us an expanded collection of visual information—quite literally available at our fingertips—summoning together aspects of the past and possibilities of the future into a boundless present. Sketchbook Revisions (2014–2015, a series of mixed-media paintings, represents my attempt to communicate the ways in which I experience my contemporary moment constructed from multiple temporalities excavated from my past. This body of work combines fragments of representational paintings created between 1995 and 2003 and nonrepresentational renderings produced between 2003 and 2014. Using traditional tracing paper and graphic color, I randomly select moments of my previous work to transfer and layer over selected areas of already-filled pages of a sketchbook I used from 2003 to 2004. These sketches depict objects I encountered in studio art classrooms and iconic architecture on the campus of McDaniel College, and often incorporate teaching notes. The final renditions of fragmented and layered histories enact the ways that we collectively experience multiple temporalities in the present. Quoting my various bodies of work, Sketchbook Revisions challenges both material and conceptual boundaries that determine fixed notions of artistic identity.

  9. Join Operations in Temporal Databases

    DEFF Research Database (Denmark)

    Gao, D.; Jensen, Christian Søndergaard; Snodgrass, R.T.

    2005-01-01

    Joins are arguably the most important relational operators. Poor implementations are tantamount to computing the Cartesian product of the input relations. In a temporal database, the problem is more acute for two reasons. First, conventional techniques are designed for the evaluation of joins...... with equality predicates rather than the inequality predicates prevalent in valid-time queries. Second, the presence of temporally varying data dramatically increases the size of a database. These factors indicate that specialized techniques are needed to efficiently evaluate temporal joins. We address...... this need for efficient join evaluation in temporal databases. Our purpose is twofold. We first survey all previously proposed temporal join operators. While many temporal join operators have been defined in previous work, this work has been done largely in isolation from competing proposals, with little...

  10. Knowledge acquisition for temporal abstraction.

    Science.gov (United States)

    Stein, A; Musen, M A; Shahar, Y

    1996-01-01

    Temporal abstraction is the task of detecting relevant patterns in data over time. The knowledge-based temporal-abstraction method uses knowledge about a clinical domain's contexts, external events, and parameters to create meaningful interval-based abstractions from raw time-stamped clinical data. In this paper, we describe the acquisition and maintenance of domain-specific temporal-abstraction knowledge. Using the PROTEGE-II framework, we have designed a graphical tool for acquiring temporal knowledge directly from expert physicians, maintaining the knowledge in a sharable form, and converting the knowledge into a suitable format for use by an appropriate problem-solving method. In initial tests, the tool offered significant gains in our ability to rapidly acquire temporal knowledge and to use that knowledge to perform automated temporal reasoning.

  11. [Temporal meaning of suffering].

    Science.gov (United States)

    Porée, J

    2015-09-01

    If we had to find a few simple words to express what a suffering human being experiences, no matter what ills are causing the suffering and no matter what circumstances underlie the ills themselves, we could unmistakably say that it is the experience of not being able to go on like this. Suffering can be described, in this same sense, as an alteration in temporality. However, describing suffering as such only makes sense if we already have a conception of normal temporality. Yet for this, philosophical tradition offers not one but four competing conceptions. In the present article, we begin by briefly presenting these different conceptions. We then show how each one sheds light, by way of contrast, on a phenomenon whose meaning thus appears to be essentially negative. But does this phenomenon have a negative meaning only? Doesn't it correspond as much to a transformation as an alteration of temporality? This is what we will strive to establish in the third part of the article by relating suffering to hope, in a paradoxical sense of the term. Of the four conceptions of time likely to shed a contrasting light on the upheavals that suffering introduces into our life experience, the one described by Aristotle in Physics is historically the first. In particular, the notion of succession originates therein. But this conception does not account for what makes time the unit of a past, a present, and a future. In Book XI of Confessions, St. Augustine situated this unit not in nature but in the human mind. Hence, his definition of time as a distension of the soul and the necessary division into physical time and psychic time it entails. Husserl's Lessons on the phenomenology of the consciousness of internal time lend credit to this division, but they illuminate only the internal constitution of the "present", which is at the heart of the psychological conception of time. In Being and Time, Heidegger breaks away from this long-standing tradition; in his view, physical time

  12. Temporal Representation in Semantic Graphs

    Energy Technology Data Exchange (ETDEWEB)

    Levandoski, J J; Abdulla, G M

    2007-08-07

    A wide range of knowledge discovery and analysis applications, ranging from business to biological, make use of semantic graphs when modeling relationships and concepts. Most of the semantic graphs used in these applications are assumed to be static pieces of information, meaning temporal evolution of concepts and relationships are not taken into account. Guided by the need for more advanced semantic graph queries involving temporal concepts, this paper surveys the existing work involving temporal representations in semantic graphs.

  13. Histology of sheep temporal bone A histologia do osso temporal do ovino

    Directory of Open Access Journals (Sweden)

    Hormy Biavatti Soares

    2011-06-01

    Full Text Available Previous studies suggest that there is an excellent correlation between the morphology and dimensions of ear structures in sheep and human beings. AIM: To analyze and describe the histology of structures inside the temporal bone in sheep. MATERIAL AND METHODS: A total of 307 slides obtained from vertical and horizontal sections of the temporal bone of eight sheep were analyzed. Structures were classified as similar or not similar to human structures, based on cellularity and histological architecture parameters. STUDY DESIGN: Experimental. RESULTS: The study revealed similarities between sheep and humans in terms of type of epithelium, bone component, spaces in the auditory meatus, in addition to a marked histological resemblance of cellularity and that of the structures surrounding the ear. The main differences observed were the presence of an anatomic bulla, the absence of aeration in the mastoid and the inferior opening of the hypotympanum into the bulla in sheep. CONCLUSION: Based on these observations, it is possible to conclude that sheep represent an adequate option for training and research in otologic surgery.Resultados prévios apontam para uma ótima correlação entre a morfologia e as dimensões das estruturas anatômicas de ovelhas e seres humanos. OBJETIVO: Analisar e descrever a histologia das estruturas que compõem o osso temporal do ovino. MATERIAL E MÉTODO: Um total de 307 lâminas obtidas a partir de secções verticais e horizontais do osso temporal de oito ovelhas foi analisado. As estruturas foram caracterizadas como semelhantes ou não semelhantes às do ser humano, com base na celularidade e na arquitetura histológica das estruturas. DESENHO CIENTÍFICO: Experimental. RESULTADOS: Constatou-se semelhança quanto ao tipo de epitélio, componente ósseo, espaços da fenda auditiva e arquitetura, além da semelhança, em nível histológico, tanto dos componentes celulares como das estruturas contíguas ao ouvido. As

  14. Temporality and Time in Fascist Experience

    Directory of Open Access Journals (Sweden)

    Lorenzo Santoro

    2014-05-01

    Full Text Available The article deals with the theme of Temporality in Italian fascism, an argument that is significant in order to analyze its peculiar approach to mass culture, mass rites but also concerning the function of its elite culture. A number of fascist political leaders, intellectuals and agitators insisted in such argument as a fundamental element in the developing of the regime and the approaching of its most peculiar qualities such as new multifaceted   imperialism and the necessity to project a new Nation imbued of a new political and monolithic culture.  Fascism tried to gain a synthesis between very different cultural elements such as futurism, revolutionarism and classicism, romanità, which deserve a peculiar analysis able to deal with the complexity of mass society. For these reasons the essay proposes an articulated methodologically overview on the argument of Temporality in Historiography and social sciences. In fact it insists in analyzing. Normal 0 21 false false false ES X-NONE X-NONE /* 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;}

  15. Estimulação cognitiva para idoso com Doença de Alzheimer realizada pelo cuidador

    Directory of Open Access Journals (Sweden)

    Thiara Joanna Peçanha da Cruz

    2015-06-01

    Full Text Available RESUMOObjetivo:conhecer a influência da estimulação cognitiva no domicílio, realizada pelo cuidador de idosos com Doença de Alzheimer.Método:realizado estudo de caso com cinco idosos com Doença de Alzheimer e seus cuidadores. As etapas de desenvolvimento da pesquisa foram: orientação aos cuidadores, seleção dos idosos e cuidadores; abordagem dos sujeitos no domicílio, encontros semanais e reaplicação dos testes para acompanhamento da função cognitiva do idoso.Resultados:no período de três meses foi possível identifi car melhora da cognição, verificada pelo resultado do Mini Exame do Estado Mental (MEEM. Os demais testes (KATZ, LAWTON, TDR e TFV mantiveram os escores iniciais.Conclusões:esta estratégia pode ser considerada uma tecnologia leve do cuidado de enfermagem para idosos com demência. Quando o cuidador realiza este cuidado, após o suporte do enfermeiro, sente-se menos ansioso e com maior compreensão da doença.

  16. Auditory temporal processing in patients with temporal lobe epilepsy.

    Science.gov (United States)

    Lavasani, Azam Navaei; Mohammadkhani, Ghassem; Motamedi, Mahmoud; Karimi, Leyla Jalilvand; Jalaei, Shohreh; Shojaei, Fereshteh Sadat; Danesh, Ali; Azimi, Hadi

    2016-07-01

    Auditory temporal processing is the main feature of speech processing ability. Patients with temporal lobe epilepsy, despite their normal hearing sensitivity, may present speech recognition disorders. The present study was carried out to evaluate the auditory temporal processing in patients with unilateral TLE. The present study was carried out on 25 patients with epilepsy: 11 patients with right temporal lobe epilepsy and 14 with left temporal lobe epilepsy with a mean age of 31.1years and 18 control participants with a mean age of 29.4years. The two experimental and control groups were evaluated via gap-in-noise and duration pattern sequence tests. One-way ANOVA was run to analyze the data. The mean of the threshold of the GIN test in the control group was observed to be better than that in participants with LTLE and RTLE. Also, it was observed that the percentage of correct responses on the DPS test in the control group and in participants with RTLE was better than that in participants with LTLE. Patients with TLE have difficulties in temporal processing. Difficulties are more significant in patients with LTLE, likely because the left temporal lobe is specialized for the processing of temporal information. Copyright © 2016 Elsevier Inc. All rights reserved.

  17. MODIFICACION DEL PLANO INCLINADO: UNA ALTERNATIVA SEGURA PARA EL USO EN NIÑOS

    OpenAIRE

    GUTIERREZ CARMONA., SONIA ALEJANDRA

    2013-01-01

    El uso de este aparato es seguro, higiénico y cómodo para el uso en niños con dentición temporal o mixta temprana. De igual manera es práctico, de fácil elaboración y con buenos resultados para el médico tratante

  18. Soil moisture spatio-temporal behavior of Pinus pinaster stands on sandy flatlands of central Spain.

    Energy Technology Data Exchange (ETDEWEB)

    Gomez-Sanz, V.; Garcia-Vinas, J. I.

    2011-07-01

    Pinus pinaster stands in the center of the Iberian Peninsula frequently grow in a unique hydrological system characterized by a variable groundwater table near the soil surface and highly permeable soils (arenosols). Over the last few decades, this superficial aquifer has been overused as a water resource, especially for irrigated crops. Overuse has reached a critical level and has caused various environmental impacts and a water sustainability crisis wherein rainfall variability does not allow for a sufficient level of aquifer recharge by natural means. Within this changing scenario, soil water significantly affects the spatio-temporal ecological response, necessitating more extensive characterization of the complex soil-tree water relationship. The primary goal of the present work was to evaluate the influence of root zone soil moisture on the observed spatial response of Pinus pinaster stands. Volumetric soil moisture content was measured at eleven forest sites, using time-domain reflectometry (TDR), over a two-year observation period. The results demonstrate that the combined effect of groundwater table proximity and dune morphology associated with this area are the main factors driving very different water availability conditions among the monitored hydrological response units, which modulate maritime pine installation and development. Topographically lower areas are more heterogeneous in terms of soil moisture behavior. In these areas, the conifer forests that are connected to the water table may be the most sensitive to land use changes within current environmental change scenarios. Consequently, in these pine ecosystems, the combined influences of geomorphology and water table proximity on variations in root zone soil moisture are essential and must be considered to develop adequate adaptive management models. (Author) 25 refs.

  19. Model Checking Discounted Temporal Properties

    NARCIS (Netherlands)

    de Alfaro, Luca; Faella, Marco; Henzinger, Thomas A.; Majumdar, Rupak; Stoelinga, Mariëlle Ida Antoinette

    2005-01-01

    Temporal logic is two-valued: a property is either true or false. When applied to the analysis of stochastic systems, or systems with imprecise formal models, temporal logic is therefore fragile: even small changes in the model can lead to opposite truth values for a specification. We present a

  20. Model Checking Discounted Temporal Properties

    NARCIS (Netherlands)

    de Alfaro, Luca; Faella, Marco; Henzinger, Thomas A.; Majumdar, Rupak; Stoelinga, Mariëlle Ida Antoinette; Jensen, K; Podelski, A.

    2004-01-01

    Temporal logic is two-valued: a property is either true or false. When applied to the analysis of stochastic systems, or systems with imprecise formal models, temporal logic is therefore fragile: even small changes in the model can lead to opposite truth values for a specification. We present a

  1. Temporal Cyber Attack Detection.

    Energy Technology Data Exchange (ETDEWEB)

    Ingram, Joey Burton [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Draelos, Timothy J. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Galiardi, Meghan [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Doak, Justin E. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2017-11-01

    Rigorous characterization of the performance and generalization ability of cyber defense systems is extremely difficult, making it hard to gauge uncertainty, and thus, confidence. This difficulty largely stems from a lack of labeled attack data that fully explores the potential adversarial space. Currently, performance of cyber defense systems is typically evaluated in a qualitative manner by manually inspecting the results of the system on live data and adjusting as needed. Additionally, machine learning has shown promise in deriving models that automatically learn indicators of compromise that are more robust than analyst-derived detectors. However, to generate these models, most algorithms require large amounts of labeled data (i.e., examples of attacks). Algorithms that do not require annotated data to derive models are similarly at a disadvantage, because labeled data is still necessary when evaluating performance. In this work, we explore the use of temporal generative models to learn cyber attack graph representations and automatically generate data for experimentation and evaluation. Training and evaluating cyber systems and machine learning models requires significant, annotated data, which is typically collected and labeled by hand for one-off experiments. Automatically generating such data helps derive/evaluate detection models and ensures reproducibility of results. Experimentally, we demonstrate the efficacy of generative sequence analysis techniques on learning the structure of attack graphs, based on a realistic example. These derived models can then be used to generate more data. Additionally, we provide a roadmap for future research efforts in this area.

  2. Temporal Ventriloquism Reveals Intact Audiovisual Temporal Integration in Amblyopia.

    Science.gov (United States)

    Richards, Michael D; Goltz, Herbert C; Wong, Agnes M F

    2018-02-01

    We have shown previously that amblyopia involves impaired detection of asynchrony between auditory and visual events. To distinguish whether this impairment represents a defect in temporal integration or nonintegrative multisensory processing (e.g., cross-modal matching), we used the temporal ventriloquism effect in which visual temporal order judgment (TOJ) is normally enhanced by a lagging auditory click. Participants with amblyopia (n = 9) and normally sighted controls (n = 9) performed a visual TOJ task. Pairs of clicks accompanied the two lights such that the first click preceded the first light, or second click lagged the second light by 100, 200, or 450 ms. Baseline audiovisual synchrony and visual-only conditions also were tested. Within both groups, just noticeable differences for the visual TOJ task were significantly reduced compared with baseline in the 100- and 200-ms click lag conditions. Within the amblyopia group, poorer stereo acuity and poorer visual acuity in the amblyopic eye were significantly associated with greater enhancement in visual TOJ performance in the 200-ms click lag condition. Audiovisual temporal integration is intact in amblyopia, as indicated by perceptual enhancement in the temporal ventriloquism effect. Furthermore, poorer stereo acuity and poorer visual acuity in the amblyopic eye are associated with a widened temporal binding window for the effect. These findings suggest that previously reported abnormalities in audiovisual multisensory processing may result from impaired cross-modal matching rather than a diminished capacity for temporal audiovisual integration.

  3. Toward a clinic of temporality?

    Science.gov (United States)

    Rivasseau Jonveaux, Thérèse; Batt, Martine; Trognon, Alain

    2017-12-01

    The discovery of time cells has expanded our knowledge in the field of spatial and temporal information coding and the key role of the hippocampus. The internal clock model complemented with the attentional gate model allows a more in-depth understanding of the perception of time. The motor representation of duration is ensured by the basal ganglia, while the cerebellum synchronizes short duration for the movement. The right prefrontal cortex seemingly intervenes in the handling of temporal information in working memory. The temporal lobe ensures the comparison of durations, especially the right lobe for the reference durations and the medial lobe for the reproduction of durations in episodic memory. During normal aging, the hypothesis of slowing of the temporal processor is evoked when noting the perception of the acceleration of the passage of time that seemingly occurs with advancing age. The various studies pertaining specifically to time cognition, albeit heterogeneous in terms of methodology, attest to the wide-ranging disturbances of this cognitive field during the course of numerous disorders, whether psychiatric - depression and schizophrenia notably - or neurological. Hence, perturbations in temporality are observed in focal brain lesions and in subcortical disorders, such as Parkinson's disease or Huntington's chorea. Alzheimer's disease represents a particularly fertile field of exploration with regard to time cognition and temporality. The objectified deconstruction of temporal experience provides insights into the very processes of temporality and their nature: episodic, semantic and procedural. In addition to exploration based on elementary stimuli, one should also consider the time lived, i.e. that of the subject, to better understand cognition as it relates to time. While the temporal dimension permeates the whole cognitive field, it remains largely neglected: integration of a genuine time cognition and temporality clinic in daily practice remains

  4. Estimación temporal en seres humanos mediante el procedimiento pico con interrupciones

    Directory of Open Access Journals (Sweden)

    Ramsés Vázquez-Lira

    2011-03-01

    Full Text Available Diversos procedimientos empleados en el estudio del aprendizaje animal hansido adaptados para investigación con humanos; específicamente, los procedimientosde intervalo fijo, bisección y generalización temporal, y el procedimientopico, originalmente empleados para estudiar el proceso de estimación temporalen animales no humanos, han sido también utilizados con humanos, brindandoimportantes conocimientos para la comprensión del comportamiento humano. Elpresente trabajo reporta la adaptación para humanos del procedimiento pico coninterrupciones, utilizado en las últimas décadas para dilucidar aspectos atencionalesy mnémicos del proceso de estimación temporal. Se encontró que los 35participantes (22.3 ± 3.1 años de edad tienden a detener su estimación temporaldurante la interrupción, conservando en memoria temporal el tiempo previo a lainterrupción; los presentes resultados sugieren que la tasa de decaimiento dememoria temporal en humanos es menor que en cualquiera de las otras especiesque han sido evaluadas en este procedimiento.

  5. Estrategias para negociaciones exitosas.

    OpenAIRE

    José B. Parra V; Evelinda Santiago J.; Misael Murillo M.; Candy Atonal N.

    2010-01-01

    Las estrategias de negociación son herramientas para disminuir conflictos o para intercambiar bienes y servicios. Una negociación exitosa crea relaciones de solidaridad y propicia reciprocidad, cooperación y confianza para quienes tendrán relaciones permanentes de negociación con beneficios para ambas partes. Una estrategia de negociación exitosa requiere manejar el desarrollo del ambiente social del grupo de personas, con la finalidad de tener presente las fronteras que no pueden irrumpirse....

  6. Spatio-temporal variability of soil water content on the local scale in a Mediterranean mountain area (Vallcebre, North Eastern Spain). How different spatio-temporal scales reflect mean soil water content

    Science.gov (United States)

    Molina, Antonio J.; Latron, Jérôme; Rubio, Carles M.; Gallart, Francesc; Llorens, Pilar

    2014-08-01

    As a result of complex human-land interactions and topographic variability, many Mediterranean mountain catchments are covered by agricultural terraces that have locally modified the soil water content dynamic. Understanding these local-scale dynamics helps us grasp better how hydrology behaves on the catchment scale. Thus, this study examined soil water content variability in the upper 30 cm of the soil on a Mediterranean abandoned terrace in north-east Spain. Using a dataset of high spatial (regular grid of 128 automatic TDR probes at 2.5 m intervals) and temporal (20-min time step) resolution, gathered throughout a 84-day period, the spatio-temporal variability of soil water content at the local scale and the way that different spatio-temporal scales reflect the mean soil water content were investigated. Soil water content spatial variability and its relation to wetness conditions were examined, along with the spatial structuring of the soil water content within the terrace. Then, the ability of single probes and of different combinations of spatial measurements (transects and grids) to provide a good estimate of mean soil water content on the terrace scale was explored by means of temporal stability analyses. Finally, the effect of monitoring frequency on the magnitude of detectable daily soil water content variations was studied. Results showed that soil water content spatial variability followed a bimodal pattern of increasing absolute variability with increasing soil water content. In addition, a linear trend of decreasing soil water content as the distance from the inner part of the terrace increased was identified. Once this trend was subtracted, resulting semi-variograms suggested that the spatial resolution examined was too high to appreciate spatial structuring in the data. Thus, the spatial pattern should be considered as random. Of all the spatial designs tested, the 10 × 10 m mesh grid (9 probes) was considered the most suitable option for a good

  7. Semantics of Temporal Models with Multiple Temporal Dimensions

    DEFF Research Database (Denmark)

    Kraft, Peter; Sørensen, Jens Otto

    ending up with lexical data models. In particular we look upon the representations by sets of normalised tables, by sets of 1NF tables and by sets of N1NF/nested tables. At each translation step we focus on how the temporal semantic is consistently maintained. In this way we recognise the requirements...... for representation of temporal properties in different models and the correspondence between the models. The results rely on the assumptions that the temporal dimensions are interdependent and ordered. Thus for example the valid periods of existences of a property in a mini world are dependent on the transaction...... periods in which the corresponding recordings are valid. This is not the normal way of looking at temporal dimensions and we give arguments supporting our assumption....

  8. Subvenciones para instituciones Directrices para gastos de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    IDRC CRDI

    División de Administración de Subvenciones ... En la Parte 2 del Acuerdo de Subvención estándar de IDRC se incluyen los límites ... pagar los costos de sustitución (tiempo libre para personal académico) de los investigadores principales.

  9. Temporal bone trauma and imaging

    International Nuclear Information System (INIS)

    Turetschek, K.; Czerny, C.; Wunderbaldinger, P.; Steiner, E.

    1997-01-01

    Fractures of the temporal bone result from direct trauma to the temporal bone or occur as one component of a severe craniocerebral injury. Complications of temporal trauma are hemotympanon, facial nerve paralysis, conductive or sensorineur hearing loss, and leakage of cerebrospinal fluid. Erly recognition and an appropiate therapy may improve or prevent permanent deficits related to such complications. Only 20-30% of temporal bone fractures can be visualized by plain films. CT has displaced plain radiography in the investigation of the otological trauma because subtle bony details are best evaluated by CT which even can be reformatted in multiple projections, regardless of the original plane of scanning. Associated epidural, subdural, and intracerebral hemorrhagic lesions are better defined by MRI. (orig.) [de

  10. Temporal dimension in cognitive models

    International Nuclear Information System (INIS)

    Decortis, F.; Cacciabue, P.C.

    1988-01-01

    Increased attention has been given to the role of humans in nuclear power plant safety, but one aspect seldom considered is the temporal dimension of human reasoning. Time is recognized as crucial in human reasoning and has been the subject of empirical studies where cognitive mechanisms and strategies to face the temporal dimension have been studied. The present study shows why temporal reasoning is essential in Human Reliability Analysis and how it could be introduced in a human model. Accounting for the time dimension in human behaviour is discussed first, with reference to proven field studies. Then, theoretical modelling of the temporal dimension in human reasoning and its relevance in simulation of cognitive activities of plant operator is discussed. Finally a Time Experience Model is presented

  11. Temporal anteroinferior encephalocele: An underrecognized etiology of temporal lobe epilepsy?

    Science.gov (United States)

    Saavalainen, Taavi; Jutila, Leena; Mervaala, Esa; Kälviäinen, Reetta; Vanninen, Ritva; Immonen, Arto

    2015-10-27

    To report the increasing frequency with which temporal anteroinferior encephalocele is a cause of adult temporal lobe epilepsy, to illustrate the clinical and imaging characteristics of this condition, and to report its surgical treatment in a series of 23 adult patients. Epilepsy patients diagnosed with temporal anteroinferior encephalocele from January 2006 to December 2013 in a national epilepsy reference center were included in this noninterventional study. Twenty-three epilepsy patients (14 female, mean age 43.8 years) were diagnosed with temporal anteroinferior encephalocele in our institute. Thirteen patients had ≥2 encephaloceles; 7 cases presented bilaterally. The estimated frequency of this condition was 0.3% among MRI examinations performed due to newly diagnosed epilepsy (n = 6) and 1.9% among drug-resistant patients referred to our center (n = 17). Nine patients with local encephalocele disconnection (n = 4) or anterior temporal lobectomy and amygdalohippocampectomy (n = 5) have become seizure-free (Engel 1) for a mean 2.8 years (range 3 months-6.2 years) of follow-up. Three patients with local encephalocele disconnection were almost seizure-free or exhibited worthwhile improvement. Histologically, all 12 surgical patients had gliosis at the base of the encephalocele; some had cortical laminar disorganization (n = 5) or mild hippocampal degeneration (n = 1). The possibility of a temporal encephalocele should be considered when interpreting MRI examinations of patients with medically intractable focal epilepsy. These patients can significantly benefit from unitemporal epilepsy surgery, even in cases with bilateral encephaloceles. © 2015 American Academy of Neurology.

  12. The Temporality of Power and the Power of Temporality

    DEFF Research Database (Denmark)

    Costas, Jana; Grey, Christopher

    2014-01-01

    This paper extends existing understandings of power, resistance and subjectivity in professional service organizations by developing an analysis of how these relate to temporality. Drawing in particular on Hoy’s reading of the Foucauldian account of temporality, we conceive of disciplinary power...... regimes and resistance as inherently future-oriented, or, to use Ybema’s term, postalgic. In moving beyond the extant research focus on self-disciplined and/or counter-resistant professional selves, we draw attention to the imaginary future self as an employee response to disciplinary power. In contrast...

  13. Oro para Colombia

    OpenAIRE

    Rubio Forero, María Claudia

    2016-01-01

    Las mujeres han debido atravesar un largo camino partiendo de la discriminación hasta empezar un proceso de equidad en la sociedad y en el deporte, de esta manera llegar a ser parte de un evento como los Juegos Olímpicos. Esta tesis toma el caso de tres atletas colombianas y describe su proceso de formación para lograr dos medallas de oro para el país.

  14. Temporal auditory processing in elders

    Directory of Open Access Journals (Sweden)

    Azzolini, Vanuza Conceição

    2010-03-01

    Full Text Available Introduction: In the trial of aging all the structures of the organism are modified, generating intercurrences in the quality of the hearing and of the comprehension. The hearing loss that occurs in consequence of this trial occasion a reduction of the communicative function, causing, also, a distance of the social relationship. Objective: Comparing the performance of the temporal auditory processing between elderly individuals with and without hearing loss. Method: The present study is characterized for to be a prospective, transversal and of diagnosis character field work. They were analyzed 21 elders (16 women and 5 men, with ages between 60 to 81 years divided in two groups, a group "without hearing loss"; (n = 13 with normal auditive thresholds or restricted hearing loss to the isolated frequencies and a group "with hearing loss" (n = 8 with neurosensory hearing loss of variable degree between light to moderately severe. Both the groups performed the tests of frequency (PPS and duration (DPS, for evaluate the ability of temporal sequencing, and the test Randon Gap Detection Test (RGDT, for evaluate the temporal resolution ability. Results: It had not difference statistically significant between the groups, evaluated by the tests DPS and RGDT. The ability of temporal sequencing was significantly major in the group without hearing loss, when evaluated by the test PPS in the condition "muttering". This result presented a growing one significant in parallel with the increase of the age group. Conclusion: It had not difference in the temporal auditory processing in the comparison between the groups.

  15. Estrategias para negociaciones exitosas.

    Directory of Open Access Journals (Sweden)

    José B. Parra V

    2010-01-01

    Full Text Available Las estrategias de negociación son herramientas para disminuir conflictos o para intercambiar bienes y servicios. Una negociación exitosa crea relaciones de solidaridad y propicia reciprocidad, cooperación y confianza para quienes tendrán relaciones permanentes de negociación con beneficios para ambas partes. Una estrategia de negociación exitosa requiere manejar el desarrollo del ambiente social del grupo de personas, con la finalidad de tener presente las fronteras que no pueden irrumpirse. Otro aspecto importante, es el lenguaje corporal utilizado por las personas y las tácticas que se practican. El manejo de esta información permite diseñar diferentes modelos de negociaciones para cada caso específico. Este documento propone la utilización de la herramienta MONACO, diseñada por los autores, que es un software útil para encontrar los mejores tácticas posibles dentro de una negociación; basándose en el lenguaje corporal que muestra el negociante oponente durante cada oferta monetaria. El uso de este software da al negociador la oportunidad de manejar las negociaciones con mayor control, el negociador que usa el software puede elegir una estrategia de acuerdo a las relaciones que espera mantener con el negociador oponente.

  16. Jerarquía temporal en Bergson y Whitehead

    OpenAIRE

    Gunter, Pete A. Y.

    2011-01-01

    Este artículo intenta analizar el método filosófico de bergson y aplicarlo luego a las nociones de tiempo biológico y jerarquía temporal en biología. Para bergson, la intuición no es un acto único, sino un número de actos, cada uno de los cuales enfocado en un nivel (amplitud) particular de duración. Tales actos, enfocados en los ritmos de los organismos vivos, pueden llevar a investigaciones en cronobiología. La filosofía de Bergson, con su diversidad de organismos existentes y niveles de...

  17. Temporal Lobe Epilepsy in Children

    Science.gov (United States)

    Nickels, Katherine C.; Wong-Kisiel, Lily C.; Moseley, Brian D.; Wirrell, Elaine C.

    2012-01-01

    The temporal lobe is a common focus for epilepsy. Temporal lobe epilepsy in infants and children differs from the relatively homogeneous syndrome seen in adults in several important clinical and pathological ways. Seizure semiology varies by age, and the ictal EEG pattern may be less clear cut than what is seen in adults. Additionally, the occurrence of intractable seizures in the developing brain may impact neurocognitive function remote from the temporal area. While many children will respond favorably to medical therapy, those with focal imaging abnormalities including cortical dysplasia, hippocampal sclerosis, or low-grade tumors are likely to be intractable. Expedient workup and surgical intervention in these medically intractable cases are needed to maximize long-term developmental outcome. PMID:22957247

  18. Temporal hypometabolism at the onset of cryptogenic temporal lobe epilepsy

    Energy Technology Data Exchange (ETDEWEB)

    Matheja, P.; Kuwert, T.; Weckesser, M.; Schober, O. [Dept. of Nuclear Medicine, Muenster Univ. (Germany); Luedemann, P.; Kellinghaus, C.; Diehl, B.; Ringelstein, E.B. [Dept. of Neurology, Muenster Univ. (Germany); Schuierer, G. [Dept. of Clinical Radiology, Muenster Univ. (Germany)

    2001-05-01

    Most patients with intractable temporal lobe epilepsy (TLE) exhibit temporal glucose hypometabolism. The reasons for the development of this abnormality are as yet unclear. The current notion is that an initial injury causes seizures, which in turn give rise to hypometabolism. The aim of this study was to assess whether temporal reductions in glucose metabolism in non-lesional TLE are the result of repeated seizures or whether hypometabolism represents an initial disturbance at the onset of disease. Glucose consumption was assessed with fluorine-18 fluorodeoxyglucose positron emission tomography ({sup 18}F-FDG PET) in 62 patients with cryptogenic non-refractory TLE in different stages of disease. Twelve subjects without neurological illness served as controls. Patients with onset of epilepsy at least 3 years prior to the PET scan were defined as having chronic TLE. Using this criterion, the whole patient cohort included 27 patients with de novo TLE and 35 patients with chronic TLE. The groups were matched for age and sex. The appearance of high-resolution magnetic resonance images of the brain was unremarkable in all patients. In the total cohort, number, duration and frequency of seizures had a significant relation to the magnitude of hypometabolism. Temporal hypometabolism was exhibited by 26 of the 62 patients (42%), including 8 out of 27 (30%) with newly diagnosed TLE and 18 out of 35 (51%) with chronic TLE. The disturbances were more extensive and more severe in patients with chronic TLE. It is concluded that temporal hypometabolism may already be present at the onset of TLE, but is less frequent and less severe in newly diagnosed than in chronic TLE. The metabolic disturbance correlates with the number of seizures. These findings suggest that an initial dysfunction is present in a considerable number of patients and that hypometabolism is worsened by continuing epileptic activity. (orig.)

  19. TEMPORAL QUERY PROCESSIG USING SQL SERVER

    OpenAIRE

    Vali Shaik, Mastan; Sujatha, P

    2017-01-01

    Most data sources in real-life are not static but change their information in time. This evolution of data in time can give valuable insights to business analysts. Temporal data refers to data, where changes over time or temporal aspects play a central role. Temporal data denotes the evaluation of object characteristics over time. One of the main unresolved problems that arise during the data mining process is treating data that contains temporal information. Temporal queries on time evolving...

  20. Osteoradionecrosis of the temporal bone

    International Nuclear Information System (INIS)

    Fujimori, Masato; Koyama, Yukiko; Enomoto, Fuyuki; Ichikawa, Ginichiro

    2002-01-01

    We report a case of temporal bone necrosis that emerged after radiotherapy for epipharyngeal carcinoma performed 13 years ago. The patient was a 51-year-old male. His major complaint was left facial swelling. The patient underwent chemotherapy and radiotherapy (Co 60, 6120 rad), as the treatment of that period, for epipharyngeal carcinoma from September 30, 1986 to January 31, 1987. He also underwent lobectomy of the left temporal lobe in brain surgery for left temporal lobe necrosis in August, 1989. After that operation, we saw constriction in his left external acoustic meatus and continued the follow-up. On October 22, 1999 he felt a left facial swelling. We found skin defects and ulcer formation in the front part of his left ear. Although we administered an antiseptic and antibiotic to the diseased area, his condition did not improve. He was hospitalized for the purpose of undergoing medical treatment on January 6, 2000. We found extensive skin necrosis and defects in his left auricular area. The corrupted temporal bone reached the zygomatic, the bone department external acoustic meatus and the mastoid process was exposing. We performed debridement of the diseased area on January 19, 2000. On February 23, we performed reconstruction by left trapezius muscle flap after debridement once again. One year after the operation, the flap was completely incorporated. (author)

  1. Temporal structures in shell models

    DEFF Research Database (Denmark)

    Okkels, F.

    2001-01-01

    The intermittent dynamics of the turbulent Gledzer, Ohkitani, and Yamada shell-model is completely characterized by a single type of burstlike structure, which moves through the shells like a front. This temporal structure is described by the dynamics of the instantaneous configuration of the shell...

  2. Temporal form in interaction design

    DEFF Research Database (Denmark)

    Vallgårda, Anna; Winther, Morten Trøstrup; Mørch, Nina

    2015-01-01

    temporal forms by letting a series of expert designers reflect upon them. We borrow a framework from Boorstin’s film theory in which he distinguishes between the voyeuristic, the vicarious, and the visceral experience. We show how to use rhythms, complexity, gentle or forceful behavior, etc., to create...

  3. Temporal factors in resource dilemmas

    NARCIS (Netherlands)

    Hendrickx, L; Poortinga, W; van der Kooij, R

    The conflict between present and future consumption lies at the heart of resource dilemmas (RDs), yet the role of time has received little attention in this research area. Emphasis was on factors related to the social rather than the temporal conflict inherent in an RD. We propose a model that deals

  4. Temporal scaling in information propagation

    Science.gov (United States)

    Huang, Junming; Li, Chao; Wang, Wen-Qiang; Shen, Hua-Wei; Li, Guojie; Cheng, Xue-Qi

    2014-06-01

    For the study of information propagation, one fundamental problem is uncovering universal laws governing the dynamics of information propagation. This problem, from the microscopic perspective, is formulated as estimating the propagation probability that a piece of information propagates from one individual to another. Such a propagation probability generally depends on two major classes of factors: the intrinsic attractiveness of information and the interactions between individuals. Despite the fact that the temporal effect of attractiveness is widely studied, temporal laws underlying individual interactions remain unclear, causing inaccurate prediction of information propagation on evolving social networks. In this report, we empirically study the dynamics of information propagation, using the dataset from a population-scale social media website. We discover a temporal scaling in information propagation: the probability a message propagates between two individuals decays with the length of time latency since their latest interaction, obeying a power-law rule. Leveraging the scaling law, we further propose a temporal model to estimate future propagation probabilities between individuals, reducing the error rate of information propagation prediction from 6.7% to 2.6% and improving viral marketing with 9.7% incremental customers.

  5. Osteoradionecrosis of the temporal bone

    Energy Technology Data Exchange (ETDEWEB)

    Fujimori, Masato; Koyama, Yukiko; Enomoto, Fuyuki; Ichikawa, Ginichiro [Juntendo Univ., Tokyo (Japan). School of Medicine

    2002-08-01

    We report a case of temporal bone necrosis that emerged after radiotherapy for epipharyngeal carcinoma performed 13 years ago. The patient was a 51-year-old male. His major complaint was left facial swelling. The patient underwent chemotherapy and radiotherapy (Co 60, 6120 rad), as the treatment of that period, for epipharyngeal carcinoma from September 30, 1986 to January 31, 1987. He also underwent lobectomy of the left temporal lobe in brain surgery for left temporal lobe necrosis in August, 1989. After that operation, we saw constriction in his left external acoustic meatus and continued the follow-up. On October 22, 1999 he felt a left facial swelling. We found skin defects and ulcer formation in the front part of his left ear. Although we administered an antiseptic and antibiotic to the diseased area, his condition did not improve. He was hospitalized for the purpose of undergoing medical treatment on January 6, 2000. We found extensive skin necrosis and defects in his left auricular area. The corrupted temporal bone reached the zygomatic, the bone department external acoustic meatus and the mastoid process was exposing. We performed debridement of the diseased area on January 19, 2000. On February 23, we performed reconstruction by left trapezius muscle flap after debridement once again. One year after the operation, the flap was completely incorporated. (author)

  6. Transition constraints for temporal attributes

    CSIR Research Space (South Africa)

    Ongoma, EAN

    2014-07-01

    Full Text Available Representing temporal data in conceptual data models and ontologies is required by various application domains. For it to be useful for modellers to represent the information precisely and reason over it, it is essential to have a language...

  7. Temporal Coding of Volumetric Imagery

    Science.gov (United States)

    Llull, Patrick Ryan

    'Image volumes' refer to realizations of images in other dimensions such as time, spectrum, and focus. Recent advances in scientific, medical, and consumer applications demand improvements in image volume capture. Though image volume acquisition continues to advance, it maintains the same sampling mechanisms that have been used for decades; every voxel must be scanned and is presumed independent of its neighbors. Under these conditions, improving performance comes at the cost of increased system complexity, data rates, and power consumption. This dissertation explores systems and methods capable of efficiently improving sensitivity and performance for image volume cameras, and specifically proposes several sampling strategies that utilize temporal coding to improve imaging system performance and enhance our awareness for a variety of dynamic applications. Video cameras and camcorders sample the video volume (x,y,t) at fixed intervals to gain understanding of the volume's temporal evolution. Conventionally, one must reduce the spatial resolution to increase the framerate of such cameras. Using temporal coding via physical translation of an optical element known as a coded aperture, the compressive temporal imaging (CACTI) camera emonstrates a method which which to embed the temporal dimension of the video volume into spatial (x,y) measurements, thereby greatly improving temporal resolution with minimal loss of spatial resolution. This technique, which is among a family of compressive sampling strategies developed at Duke University, temporally codes the exposure readout functions at the pixel level. Since video cameras nominally integrate the remaining image volume dimensions (e.g. spectrum and focus) at capture time, spectral (x,y,t,lambda) and focal (x,y,t,z) image volumes are traditionally captured via sequential changes to the spectral and focal state of the system, respectively. The CACTI camera's ability to embed video volumes into images leads to exploration

  8. Tiempo para un cambio

    Science.gov (United States)

    Woltjer, L.

    1987-06-01

    En la reunion celebrada en diciembre dei ano pasado informe al Consejo de mi deseo de terminar mi contrato como Director General de la ESO una vez que fuera aprobado el proyecto dei VLT, que se espera sucedera hacia fines de este aAo. Cuando fue renovada mi designacion hace tres aAos, el Consejo conocia mi intencion de no completar los cinco aAos dei contrato debido a mi deseo de disponer de mas tiempo para otras actividades. Ahora, una vez terminada la fase preparatoria para el VLT, Y habiendose presentado el proyecto formalmente al Consejo el dia 31 de marzo, y esperando su muy probable aprobacion antes dei termino de este ano, me parece que el 10 de enero de 1988 presenta una excelente fecha para que se produzca un cambio en la administracion de la ESO.

  9. Temporal motifs in time-dependent networks

    International Nuclear Information System (INIS)

    Kovanen, Lauri; Karsai, Márton; Kaski, Kimmo; Kertész, János; Saramäki, Jari

    2011-01-01

    Temporal networks are commonly used to represent systems where connections between elements are active only for restricted periods of time, such as telecommunication, neural signal processing, biochemical reaction and human social interaction networks. We introduce the framework of temporal motifs to study the mesoscale topological–temporal structure of temporal networks in which the events of nodes do not overlap in time. Temporal motifs are classes of similar event sequences, where the similarity refers not only to topology but also to the temporal order of the events. We provide a mapping from event sequences to coloured directed graphs that enables an efficient algorithm for identifying temporal motifs. We discuss some aspects of temporal motifs, including causality and null models, and present basic statistics of temporal motifs in a large mobile call network

  10. Para-Hermitian and para-quaternionic manifolds

    International Nuclear Information System (INIS)

    Ivanov, S.; Zamkovoy, S.

    2003-10-01

    A set of canonical para-Hermitian connections on an almost para-Hermitian manifold is defined. A Para-hermitian version of the Apostolov-Gauduchon generalization of the Goldberg-Sachs theorem in General Relativity is given. It is proved that the Nijenhuis tensor of a Nearly para-Kaehler manifolds is parallel with respect to the canonical connection. Salamon's twistor construction on quaternionic manifold is adapted to the para-quaternionic case. A locally conformally hyper-para-Kaehler (hypersymplectic) flat structure with parallel Lee form on the Kodaira-Thurston complex surfaces modeled on S 1 x SL (2, R)-tilde is constructed. Anti-self-dual locally conformally hyper-para-Kaehler (hypersymplectic) neutral metrics with non vanishing Weyl tensor are obtained on the Inoe surfaces. An example of anti-self-dual neutral metric which is not locally conformally hyper-para-Kaehler (hypersymplectic) is constructed. (author)

  11. Para-Hermitian and para-quaternionic manifolds

    Energy Technology Data Exchange (ETDEWEB)

    Ivanov, S [University of Sofia ' St. Kl. Ohridski' , Faculty of Mathematics and Informatics, Sofia (Bulgaria) and Abdus Salam International Centre for Theoretical Physics, Trieste (Italy); Zamkovoy, S [University of Sofia ' St. Kl. Ohridski' , Faculty of Mathematics and Informatics, Sofia (Bulgaria)

    2003-10-01

    A set of canonical para-Hermitian connections on an almost para-Hermitian manifold is defined. A Para-hermitian version of the Apostolov-Gauduchon generalization of the Goldberg-Sachs theorem in General Relativity is given. It is proved that the Nijenhuis tensor of a Nearly para-Kaehler manifolds is parallel with respect to the canonical connection. Salamon's twistor construction on quaternionic manifold is adapted to the para-quaternionic case. A locally conformally hyper-para-Kaehler (hypersymplectic) flat structure with parallel Lee form on the Kodaira-Thurston complex surfaces modeled on S{sup 1} x SL (2, R)-tilde is constructed. Anti-self-dual locally conformally hyper-para-Kaehler (hypersymplectic) neutral metrics with non vanishing Weyl tensor are obtained on the Inoe surfaces. An example of anti-self-dual neutral metric which is not locally conformally hyper-para-Kaehler (hypersymplectic) is constructed. (author)

  12. Temporal context for authorship attribution

    DEFF Research Database (Denmark)

    Hansen, Niels Dalum; Lioma, Christina; Larsen, Birger

    2014-01-01

    A study of temporal aspects of authorship attribution - a task which aims to distinguish automatically between texts written by different authors by measuring textual features. This task is important in a number of areas, including plagiarism detection in secondary education, which we study...... world data from Danish secondary school students show 84% prediction accuracy when using all available material and 71.9% prediction accuracy when using only the five most recent writing samples from each student....

  13. Spatio-Temporal Data Construction

    Directory of Open Access Journals (Sweden)

    Hai Ha Le

    2013-08-01

    Full Text Available On the route to a spatio-temporal geoscience information system, an appropriate data model for geo-objects in space and time has been developed. In this model, geo-objects are represented as sequences of geometries and properties with continuous evolution in each time interval. Because geomodeling software systems usually model objects at specific time instances, we want to interpolate the geometry and properties from two models of an object with only geometrical constraints (no physical or mechanical constraints. This process is called spatio-temporal data construction or morphological interpolation of intermediate geometries. This paper is strictly related to shape morphing, shape deformation, cross-parameterization and compatible remeshing and is only concerned with geological surfaces. In this study, two main sub-solutions construct compatible meshes and find trajectories in which vertices of the mesh evolve. This research aims to find an algorithm to construct spatio-temporal data with some constraints from the geosciences, such as cutting surfaces by faulting or fracturing phenomena and evolving boundaries attached to other surfaces. Another goal of this research is the implementation of the algorithm in a software product, namely a gOcad plug-in. The four main procedures of the algorithm are cutting the surfaces, setting up constraints, partitioning and calculating the parameterizations and trajectories. The software has been tested to construct data for a salt dome and other surfaces in regard to the geological processes of faulting, deposition and erosion. The result of this research is an algorithm and software for the construction of spatio-temporal data.

  14. The Machinic Temporality of Metadata

    Directory of Open Access Journals (Sweden)

    Claudio Celis

    2015-03-01

    Full Text Available In 1990 Deleuze introduced the hypothesis that disciplinary societies are gradually being replaced by a new logic of power: control. Accordingly, Matteo Pasquinelli has recently argued that we are moving towards societies of metadata, which correspond to a new stage of what Deleuze called control societies. Societies of metadata are characterised for the central role that meta-information acquires both as a source of surplus value and as an apparatus of social control. The aim of this article is to develop Pasquinelli’s thesis by examining the temporal scope of these emerging societies of metadata. In particular, this article employs Guattari’s distinction between human and machinic times. Through these two concepts, this article attempts to show how societies of metadata combine the two poles of capitalist power formations as identified by Deleuze and Guattari, i.e. social subjection and machinic enslavement. It begins by presenting the notion of metadata in order to identify some of the defining traits of contemporary capitalism. It then examines Berardi’s account of the temporality of the attention economy from the perspective of the asymmetric relation between cyber-time and human time. The third section challenges Berardi’s definition of the temporality of the attention economy by using Guattari’s notions of human and machinic times. Parts four and five fall back upon Deleuze and Guattari’s notions of machinic surplus labour and machinic enslavement, respectively. The concluding section tries to show that machinic and human times constitute two poles of contemporary power formations that articulate the temporal dimension of societies of metadata.

  15. Temporal nonlocality in bistable perception

    Science.gov (United States)

    Atmanspacher, Harald; Filk, Thomas

    2012-12-01

    A novel conceptual framework for theoretical psychology is presented and illustrated for the example of bistable perception. A basic formal feature of this framework is the non-commutativity of operations acting on mental states. A corresponding model for the bistable perception of ambiguous stimuli, the Necker-Zeno model, is sketched and some empirical evidence for it so far is described. It is discussed how a temporal nonlocality of mental states, predicted by the model, can be understood and tested.

  16. Compressing spatio-temporal trajectories

    DEFF Research Database (Denmark)

    Gudmundsson, Joachim; Katajainen, Jyrki; Merrick, Damian

    2009-01-01

    such that the most common spatio-temporal queries can still be answered approximately after the compression has taken place. In the process, we develop an implementation of the Douglas–Peucker path-simplification algorithm which works efficiently even in the case where the polygonal path given as input is allowed...... to self-intersect. For a polygonal path of size n, the processing time is O(nlogkn) for k=2 or k=3 depending on the type of simplification....

  17. Temporal ecology in the Anthropocene.

    Science.gov (United States)

    Wolkovich, E M; Cook, B I; McLauchlan, K K; Davies, T J

    2014-11-01

    Two fundamental axes - space and time - shape ecological systems. Over the last 30 years spatial ecology has developed as an integrative, multidisciplinary science that has improved our understanding of the ecological consequences of habitat fragmentation and loss. We argue that accelerating climate change - the effective manipulation of time by humans - has generated a current need to build an equivalent framework for temporal ecology. Climate change has at once pressed ecologists to understand and predict ecological dynamics in non-stationary environments, while also challenged fundamental assumptions of many concepts, models and approaches. However, similarities between space and time, especially related issues of scaling, provide an outline for improving ecological models and forecasting of temporal dynamics, while the unique attributes of time, particularly its emphasis on events and its singular direction, highlight where new approaches are needed. We emphasise how a renewed, interdisciplinary focus on time would coalesce related concepts, help develop new theories and methods and guide further data collection. The next challenge will be to unite predictive frameworks from spatial and temporal ecology to build robust forecasts of when and where environmental change will pose the largest threats to species and ecosystems, as well as identifying the best opportunities for conservation. © 2014 John Wiley & Sons Ltd/CNRS.

  18. Tritium-Labelled Thymidine (H{sup 3}TDR): Its Somatic Toxicity and Use in the Study of Growth Rates and Potentials in Normal and Malignant Tissue of Man and Animals; La Thymidine Tritiee ({sup 3}HTDR), sa Toxicite Somatique et son Emploi dans l'etude du Taux et du Potentiel de Croissance des Tissus Normaux et Malins chez l'Homme et chez les Animaux; 041c 0435 0447 0414 ; Timidina Marcada con Tritio ({sup 3}HTDR): Toxicidad Somatica y Empleo en el Estudio de las Velocidades de Crecimiento en Tejidos Normales y Malignos del Hombre y de los Animales

    Energy Technology Data Exchange (ETDEWEB)

    Cronkite, E. P.; Fliedner, T. M.; Killmann, S. A.; Rubini, J. R. [Brookhaven National Laboratory, Upton, Long Island, NY (United States)

    1962-02-15

    Tritium, with its low energy beta-emission produces high-resolution autoradiograms (ARG). H{sup 3}TDR is chemically stable, labels desoxyribonucleic acid (DNA) and thereafter is non-exchangeable. The DNA is diluted only by new DNA at the time of chromosomal replications. The intensity of the label is thus diminished by successive cell divisions. The behaviour of the labelled population is apparently consistent with the Taylor-Woods-Hughes (TWH) model of chromosome replication. Intuitively one expects to observe radiation toxicity when radio-active elements have been incorporated into DNA. The toxicity has been considered in respect to the properties of tritium and influence of chromosomal replication (TWH model), and studied empirically in mammalian testes and lymphocytes. After doses satisfactory for serial autoradiographic studies, radiation injury or perturbations in cell proliferation have not been demonstrated. To date normal hemopoiesis, acute and chronic leukaemias, multiple myeloma and selected solid tumours have been studied in man and animals. Serial data on the fraction of cells labelled and the rate of diminution in the intensity of the label have been collected. These data will be presented. Interpretation of these data is complicated by the limitations of cytologic identification, establishment of morphologic boundaries between successive stages in cell proliferation from the stem cell to non-dividing progeny and by our inability to determine whether a cell not in mitosis or DNA synthesis retains the capacity to divide again. These problems will be discussed in principle and practice. It has been established tentatively that growth rate for some normal proliferating organ systems in steady state equilibrium is greater than the growth rate in many expanding tumours. (author) [French] Le tritium, emetteur beta de faible energie, permet d'obtenir des autoradiogrammes de haute resolution. La thymidine tritiee est chimiquement stable; apres avoir marque l

  19. Evolving temporal association rules with genetic algorithms

    OpenAIRE

    Matthews, Stephen G.; Gongora, Mario A.; Hopgood, Adrian A.

    2010-01-01

    A novel framework for mining temporal association rules by discovering itemsets with a genetic algorithm is introduced. Metaheuristics have been applied to association rule mining, we show the efficacy of extending this to another variant - temporal association rule mining. Our framework is an enhancement to existing temporal association rule mining methods as it employs a genetic algorithm to simultaneously search the rule space and temporal space. A methodology for validating the ability of...

  20. Brain SPECT imaging in temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Krausz, Y.; Yaffe, S.; Atlan, H.; Cohen, D.; Konstantini, S.; Meiner, Z.

    1991-01-01

    Temporal lobe epilepsy is diagnosed by clinical symptoms and signs and by localization of an epileptogenic focus. A brain SPECT study of two patients with temporal lobe epilepsy, using 99m Tc-HMPAO, was used to demonstrate a perfusion abnormality in the temporal lobe, while brain CT and MRI were non-contributory. The electroencephalogram, though abnormal, did not localize the diseased area. The potential role of the SPECT study in diagnosis and localization of temporal lobe epilepsy is discussed. (orig.)

  1. Constructing catalogue of temporal situations

    Directory of Open Access Journals (Sweden)

    Violetta Koseska-Toszewa

    2015-11-01

    Full Text Available Constructing catalogue of temporal situations The paper is aiming to create a common basis for description, comparing, and analysis natural languages. As a subject of comparison we have chosen temporal structures of some languages. For such a choice there exists a perfect tool, describing basic temporal phenomena, namely an ordering of states and events in time, certainty and uncertainty, independency of histories of separate objects, necessity and possibility. This tool is supported by the Petri nets formalism, which seems to be well suited for expressing the above mentioned phenomena. Petri nets are built form three primitive notions: of states, of events that begin or end the states, and so-called flow relation indicating succession of states and events. This simple constituents give rise to many possibilities of representing temporal phenomena; it turns out that such representations are sufficient for many (clearly, not necessarily all temporal situations appearing in natural languages. In description formalisms used till now there is no possibility of expressing such reality phenomena as temporal dependencies in compound statement, or combination of temporality and modality. Moreover, using these formalisms one cannot distinguish between two different sources of uncertainty of the speaker while describing the reality: one, due to the lack of knowledge of the speaker what is going on in outside world, the second, due to objective impossibility of foreseen ways in which some conflict situations will be (or already have been resolved. Petri net formalism seems to be perfectly suited for such differentiations. There are two main description principles that encompassed this paper. First, that assigns meaning to names of grammatical structures in different languages may lead to misunderstanding. Two grammatical structures with apparently close names may describe different reality. Additionally, some grammatical terms used in one language may be

  2. Variación temporal de las constantes fundamentales

    Science.gov (United States)

    Landau, S. J.; Vucetich, H.

    La variación temporal de las constantes fundamentales es un problema que ha motivado numerosos trabajos teóricos y experimentales desde la hipótesis de los grandes números de Dirac en 1937. Entre los métodos experimentales y observacionales para establecer restricciones sobre la variación de las constantes fundamentes es importante mencionar: comparación entre relojes atómicos[1], métodos geofísicos[2][3], análisis de sistemas de absorción en quasares[4][5][6] y cotas provenientes de la nucleosíntesis primordial[7]. En un trabajo reciente[5], se reportó una significativa variación en la constante de estructura fina. Intentos de unificar las cuatro interacciones fundamentales dieron como resultado teorías con múltiples dimensiones como las teorías de Kaluza-Klein y teorías de supercuerdas. Estas teorías proporcionan un marco teórico natural para el estudio de la variación temporal de las constantes fundamentales. A su vez, un modelo sencillo para estudiar la variación de la constante de estructura fina, fue propuesto en [8], a partir de premisas muy generales como ser covarianza, invarianza de gauge, causalidad y invarianza ante reversiones temporales en el electromagnetismo. Diferentes versiones de las teorías antes mencionadas coinciden en predecir variaciones temporales de las constantes fundamentales pero difieren en la forma de esta variación[9][10]. De esta manera, las restricciones establecidas experimentalmente sobre la variación de las constantes fundamentales pueden ser una herramienta importante para testear estas diferentes teorías. En este trabajo, utilizamos las cotas provenientes de diversas técnicas experimentales, para testear si las mismas son consistentes con alguna de las teorías antes mencionadas. En particular, establecemos cotas sobre la variación de los parámentros libres de las diferentes teorías como por ejemplo el radio de las dimensiones extras en las teorías tipo Kaluza-Klein.

  3. Spatial and Temporal Characteristics of Precipitation Variability and Drought Patterns in the Eastern Mediterranean

    OpenAIRE

    Mathbout, Shifa

    2016-01-01

    La precipitación es una variable muy importante del clima y la hidrología. La exploración de su distribución espacial y temporal y su variación puede dar una idea acerca de las condiciones del clima y los recursos hídricos en un futuro. Por lo tanto, el mapeo amento? Preciso de la distribución temporal y espacial resulta importante para muchas aplicaciones ya sea en hidrología, climatología, agronomía, ecología, y otras ciencias ambientales. En esta tesis, se analizan las distribuciones e...

  4. Processamento auditivo em indivíduos com epilepsia de lobo temporal Auditory processing in patients with temporal lobe epilepsy

    Directory of Open Access Journals (Sweden)

    Juliana Meneguello

    2006-08-01

    Full Text Available A epilepsia do lobo temporal ocasiona descargas elétricas excessivas onde a via auditiva tem sua estação final. É uma das formas mais comuns e de mais difícil controle da doença. O correto processamento dos estímulos auditivos necessita da integridade anatômica e funcional de todas as estruturas envolvidas na via auditiva. OBJETIVO: Verificar o Processamento Auditivo de pacientes portadores de epilepsia do lobo temporal quanto aos mecanismos de discriminação de sons em seqüência e de padrões tonais, discriminação da direção da fonte sonora e atenção seletiva para sons verbais e não-verbais. MÉTODO: Foram avaliados oito indivíduos com epilepsia do lobo temporal confirmada e com foco restrito a essa região, através dos testes auditivos especiais: Teste de Localização Sonora, Teste de Padrão de Duração, Teste Dicótico de Dígitos e Teste Dicótico Não-Verbal. O seu desempenho foi comparado ao de indivíduos sem alteração neurológica (estudo caso-controle. RESULTADO: Os sujeitos com epilepsia do lobo temporal apresentaram desempenho semelhante aos do grupo controle quanto ao mecanismo de discriminação da direção da fonte sonora e desempenho inferior quanto aos demais mecanismos avaliados. CONCLUSÃO: Indivíduos com epilepsia do lobo temporal apresentaram maior prejuízo no processamento auditivo que os sem danos corticais, de idades semelhantes.Temporal epilepsy, one of the most common presentation of this pathology, causes excessive electrical discharges in the area where we have the final station of the auditory pathway. Both the anatomical and functional integrity of the auditory pathway structures are essential for the correct processing of auditory stimuli. AIM: to check the Auditory Processing in patients with temporal lobe epilepsy regarding the auditory mechanisms of discrimination from sequential sounds and tone patterns, discrimination of the sound source direction and selective attention to verbal

  5. ParaChoice Model.

    Energy Technology Data Exchange (ETDEWEB)

    Heimer, Brandon Walter [Sandia National Lab. (SNL-CA), Livermore, CA (United States); Levinson, Rebecca Sobel [Sandia National Lab. (SNL-CA), Livermore, CA (United States); West, Todd H. [Sandia National Lab. (SNL-CA), Livermore, CA (United States)

    2017-12-01

    Analysis with the ParaChoice model addresses three barriers from the VTO Multi-Year Program Plan: availability of alternative fuels and electric charging station infrastructure, availability of AFVs and electric drive vehicles, and consumer reluctance to purchase new technologies. In this fiscal year, we first examined the relationship between the availability of alternative fuels and station infrastructure. Specifically, we studied how electric vehicle charging infrastructure affects the ability of EVs to compete with vehicles that rely on mature, conventional petroleum-based fuels. Second, we studied how the availability of less costly AFVs promotes their representation in the LDV fleet. Third, we used ParaChoice trade space analyses to help inform which consumers are reluctant to purchase new technologies. Last, we began analysis of impacts of alternative energy technologies on Class 8 trucks to isolate those that may most efficaciously advance HDV efficiency and petroleum use reduction goals.

  6. Universidades accesibles para todos

    Directory of Open Access Journals (Sweden)

    Roxana Stupp Kupiec

    2001-01-01

    Full Text Available Este trabajo pretende hacer conciencia sobrelos factores que inciden en la construcción colectiva deuniversidades dispuestas a innovar y transformar suideología, sus políticas, el currículum, los servicios estu-diantiles, la infraestructura física y administrativa y lasestrategias de comunicación e información, bajo el para-digma de la accesibilidad en el entorno. Se hace referen-cia al marco legal internacional y nacional que orientalas acciones que deben planificarse e implementarse enlas instituciones de Educación Superior.En la construcción de universidades accesibles para to-dos se requiere de un cambio en la concepción curricu-lar. Se analizan conceptos como la flexibilidad en la for-mación y el acceso a los planes de estudio para respondera las necesidades educativas de todos los estudiantes. Para promover estas transformaciones se proponen prin-cipios y prácticas tales como la interdisciplinareidad y lainclusión del tema de la discapacidad en todas las carre-ras. Además, se presentan ejemplos de aplicación en dife-rentes áreas del perfil profesional, en la formación deldocente universitario y en actividades de proyección so-cial, vida estudiantil e investigación. En el ámbito estu-diantil, se describen algunos servicios y procesos que sehan desarrollado en la Universidad de Costa Rica

  7. Educando para la ignorancia

    Directory of Open Access Journals (Sweden)

    Miguel Durán

    1996-06-01

    Full Text Available Más que describir una situación particular, los autores buscan con este escrito motivar al estudiante para que asuma posiciones críticas; así como dar un campanazo de alerta a los profesores, en relación a los conocimientos que transmiten a sus alumnos y la forma en que lo hacen; todo con el ánimo de generar verdaderos espacios de reflexión en la universidad.

  8. INICIATIVAS PARA EL CAMBIO

    Directory of Open Access Journals (Sweden)

    César Alfonso Defrancisco-Larrañaga

    2013-07-01

    Full Text Available El planeta no atraviesa por su mejor momento en materia de conservación y renovación de sus recursos naturales. Claramente en los últimos tiempos los recursos hídricos han venido haciéndose cada vez menores; el hombre ha notado con preocupación y vivido en carne propia este fenómeno, que de no ser tratado a tiempo, podría atentar contra la existencia misma. Esto lo ha alentado a buscar métodos que sirvan como solución para contrarrestar éste mal y crear conciencia entre sus iguales, para así poder garantizar su permanencia y la de su entorno durante muchas generaciones. En países desarrollados del continente europeo y en algunos lugares de América del norte, el uso de sistemas de reutilización y tratamiento de aguas grises y aprovechamiento de las aguas lluvias se ha convertido en una constante y nos están dando las pautas para poder seguir el ejemplo y así de esta manera poder aportar a la causa ambiental y a su vez crear un ahorro en nuestros gastos mensuales de consumo.

  9. Blindagem eletromagnética, aterramento e proteção contra surtos de tensão em equipamentos para monitoramento automático do teor de água no solo Electromagnetic shielding, grounding and protection against voltage surges in equipments for automatic soil-water measurements

    Directory of Open Access Journals (Sweden)

    Claudia F. A. Teixeira

    2004-04-01

    Full Text Available O objetivo do presente trabalho foi implementar um sistema de blindagem eletromagnética, aterramento e proteção contra surtos de tensão na instalação de instrumental para o monitoramento automático do teor de água no solo. O experimento foi instalado em Piracicaba, São Paulo, em que os equipamentos utilizados foram um testador de cabos marca Tektronix, que opera pelo princípio da reflectometria no domínio do tempo e um sistema de aquisição de dados marca Campbell Scientific Inc. (CSI, que controla e analisa as formas de onda produzidas pelo testador de cabos. A umidade volumétrica foi obtida indiretamente por meio de sensores inseridos no solo, os quais medem a constante dielétrica do mesmo. Utilizaram-se tubos galvanizados para a blindagem eletromagnética dos cabos e hastes "cooperweld", cordoalha de cobre e terminais bimetálicos para o sistema de aterramento. Para o sistema de proteção eletroeletrônica, utilizaram-se um disjuntor para a separação do circuito de alimentação, protetor de surtos, "no-breaks" e medidor de resistência de terra. Face aos resultados obtidos, pode-se concluir que o sistema proposto, ao utilizar material geralmente preexistente em locais de pesquisa agropecuária, apresentou uma proteção eficaz.The objective of this paper was to implement an electromagnetic shielding, grounding and voltage surge protection in equipments for automatic soil water monitoring. The experiment was carried out in Piracicaba, São Paulo State, Brazil, using a Tektronix Cable Tester (Model 1502 B that operates by time domain reflectometry (TDR and a datalogger (CR10X, Campbell Scientific Inc., CSI to control and analyze the waveforms produced by the cable tester. The water content was indirectly obtained by measuring the dielectric constant through probes inserted in the soil. For electromagnetic shielding the energy and signal cables were inserted in galvanized pipes, linked together by means of copper wire fixed in

  10. Una defensa de la dimensión temporal del relativismo ético

    OpenAIRE

    Farrell, Martín

    2003-01-01

    Supongamos que puede sostenerse que el principio "No dañes a otro sin su consentimiento" tiene una validez moral universal (sea en su versión deontológica, sea en su versión consecuencialista). Esta aseveración no socava completamente al relativismo moral, sin embargo, pues este también tiene una dimensión temporal. Una acción, o una institución (la esclavitud, por ejemplo) puede ser considerada correcta para el pasado remoto e incorrecta para el siglo XXI. EI trabajo intenta mostrar la plaus...

  11. Annotating temporal information in clinical narratives.

    Science.gov (United States)

    Sun, Weiyi; Rumshisky, Anna; Uzuner, Ozlem

    2013-12-01

    Temporal information in clinical narratives plays an important role in patients' diagnosis, treatment and prognosis. In order to represent narrative information accurately, medical natural language processing (MLP) systems need to correctly identify and interpret temporal information. To promote research in this area, the Informatics for Integrating Biology and the Bedside (i2b2) project developed a temporally annotated corpus of clinical narratives. This corpus contains 310 de-identified discharge summaries, with annotations of clinical events, temporal expressions and temporal relations. This paper describes the process followed for the development of this corpus and discusses annotation guideline development, annotation methodology, and corpus quality. Copyright © 2013 Elsevier Inc. All rights reserved.

  12. Ethnographies of Youth and Temporality

    DEFF Research Database (Denmark)

    Dalsgård, Anne Line; Frederiksen, Martin Demant; Højlund, Susanne

    As we experience and manipulate time—be it as boredom or impatience—it becomes an object: something materialized and social, something that affects perception, or something that may motivate reconsideration and change. The editors and contributors to this important new book, Ethnographies of Youth...... emotional unrest and violence but also creativity and hope are responses to troubling times. The chapters discuss notions of time and its “objectification” in diverse locales including the Georgian Republic, Brazil, Denmark, and Uganda. Based on long-term ethnographic fieldwork, the essays in Ethnographies...... of Youth and Temporality use youth as a prism to understand time and its subjective experience....

  13. Chondroblastoma of the temporal bone

    Energy Technology Data Exchange (ETDEWEB)

    Kobayashi, Yuko; Murakami, Ryusuke; Toba, Masahiro; Ichikawa, Taro [Dept. of Radiology, Nippon Medical School, Tokyo (Japan); Kanazawa, Ryuzaburo; Sanno, Naoko; Shimura, Toshiro [Dept. of Neurosurgery, Nippon Medical School, Tokyo (Japan); Sawada, Namie; Hosone, Masaru [Dept. of Pathology, Nippon Medical School, Tokyo (Japan); Kumazaki, Tatsuo [Dept. of Radiology, Nippon Medical School, Tokyo (Japan)

    2001-12-01

    A rare case of chondroblastoma arising from the temporal bone that occurred in a 60-year-old woman is reported. The tumor appeared well demarcated and osteolytic on the radiographs. CT scan clearly depicted marginal and central calcification in the tumor. MR imaging demonstrated two components in the tumor: a solid component with predominantly low signal intensities on both T1- and T2-weighted sequences, and a multilocular cystic component with T1- and T2-elongation and fluid-fluid levels on the T2-weighted images. Postcontrast MR imaging revealed marked enhancement in the solid component and the septa of the cystic component. (orig.)

  14. Temporal dynamics of online petitions.

    Science.gov (United States)

    Böttcher, Lucas; Woolley-Meza, Olivia; Brockmann, Dirk

    2017-01-01

    Online petitions are an important avenue for direct political action, yet the dynamics that determine when a petition will be successful are not well understood. Here we analyze the temporal characteristics of online-petition signing behavior in order to identify systematic differences between popular petitions, which receive a high volume of signatures, and unpopular ones. We find that, in line with other temporal characterizations of human activity, the signing process is typically non-Poissonian and non-homogeneous in time. However, this process exhibits anomalously high memory for human activity, possibly indicating that synchronized external influence or contagion play and important role. More interestingly, we find clear differences in the characteristics of the inter-event time distributions depending on the total number of signatures that petitions receive, independently of the total duration of the petitions. Specifically, popular petitions that attract a large volume of signatures exhibit more variance in the distribution of inter-event times than unpopular petitions with only a few signatures, which could be considered an indication that the former are more bursty. However, petitions with large signature volume are less bursty according to measures that consider the time ordering of inter-event times. Our results, therefore, emphasize the importance of accounting for time ordering to characterize human activity.

  15. Orbitotomía lateral mediante abordaje temporal Lateral orbitotomy using a temporal approach

    Directory of Open Access Journals (Sweden)

    H. Herencia Nieto

    2005-12-01

    Full Text Available La orbitotomía lateral sigue siendo en el momento actual la técnica quirúrgica de elección para la biopsia o extirpación de lesiones intraorbitarias laterales al nervio óptico, la biopsia del propio nervio óptico y la extirpación de la glándula lacrimal. Se han descrito múltiples incisiones cutáneas para llevar a cabo esta intervención; la más frecuentemente empleada por el momento es la incisión palpebral, que discurre a nivel de alguna arruga del párpado superior. Aunque los resultados obtenidos con esta incisión suelen ser aceptables, no está exenta de complicaciones, ni estéticas ni funcionales. Por esto, en los últimos años han ido apareciendo nuevas incisiones que intentan evitar estas complicaciones. Entre estas nuevas vías de abordaje a la pared lateral de la órbita se encuentra la incisión temporal. En los últimos 3 años, se ha intervenido en nuestro servicio a cuatro pacientes para llevar a cabo biopsia o extirpación de masas intraorbitarias mediante orbitotomía lateral, siempre a través de una incisión temporal. En todos los casos esta incisión permitió una amplia exposición del campo quirúrgico y la cómoda realización de la intervención, obteniéndose resultados estéticos y funcionales excelentes, y sin ninguna secuela ni complicación permanente. La complicación específica más frecuente de esta incisión es la paresia de la rama frontal del nervio facial. Una técnica de disección cuidadosa suele ser suficiente para evitarla. Todo esto hace que esta incisión, tal y como la describimos aquí, sea de elección para llevar a cabo la orbitotomía lateral, constituyendo en nuestro criterio una alternativa perfectamente válida y a tener en cuenta frente a las incisiones «clásicas», a las que llega a superar en muchos aspectos.The lateral orbitotomy it still the surgical technique of choice for biopsies or the removal of intraorbital lesions that are lateral to the optic nerve, for biopsies of

  16. para mejorar el %R

    Directory of Open Access Journals (Sweden)

    Alfredo Díaz Mata

    2001-01-01

    Full Text Available En este trabajo se revisan dos indicadores técnicos bursátiles que están estrechamente relacionados, el oscilador estocástico %K de Lane y el oscilador %R de Williams; asimismo, se evalúa el uso de dos mecanismos asociados con el primero y que no suelen utilizarse con el %R: el proceso de frenado (slowing y el uso de un promedio móvil del propio oscilador estocástico como disparadores de señales de compra y de venta. Realizando simulaciones con 27 acciones y el Índice de Precios y Cotizaciones de la Bolsa Mexicana de Valores se verifica la hipótesis principal y se comprueba que, efectivamente, en muchos casos, el uso del proceso de frenado con el oscilador %R de Williams permite tomar mejores decisiones. Por otro lado, se concluye que de los dos disparadores de señales el que mejor funciona, tanto para %K como para %R es el uso de cotas inferior y superior. Este artículo surgió en el curso de una investigación sobre el análisis técnico bursátil de acciones que se puede realizar en su totalidad por computadora y que, esencialmente, excluye el análisis gráfico. Uno de los propósitos del estudio es determinar si es posible, y bajo qué mecanismos, establecer un sistema de análisis bursátil que le permita al inversionista tomar decisiones de inversión en acciones en la Bolsa Mexicana de Valores sin tener que emplear la considerable cantidad de tiempo que es necesario para el análisis gráfico tradicional. Durante este estudio se realizó un análisis preliminar de unos 120 indicadores técnicos para, por un lado, conocerlos con cierto detalle y, por otra parte, aislar aquellos que prometían ser de utilidad para el objetivo de la investigación. Fue en este proceso cuando se detectó que existen dos indicadores que están relacionados y que permiten un análisis por separado que tiene, cuando menos, dos ventajas. En primer lugar está el placer que da a quien gusta de estos temas encontrarse con indicadores que, de acuerdo

  17. 16-channel analyser with high time-resolution for multiple coincidence experiments; Selecteur a 16 canaux a temps de resolution eleve pour experiences de coincidences multiples; Ispol'zovanie shestiadtsatikanal'nogo analizatora s bol'shoj razreshayushchej sposobnost'yu po vremeni dlya opytov s mnogokratnymi sovpadeniyami; Analizador de 16 canales de elevado poder temporal de resolucion para experimentos de coincidencias multiples

    Energy Technology Data Exchange (ETDEWEB)

    Brandt, B; Cappeller, U [University of Marburg, Marburg, Federal Republic of Germany (Germany)

    1962-04-15

    'empilement des impulsions. La largeur du canal est commandee par un amplificateur a fenetre, ajustable entre 1 V et 7 V. La hauteur du canal peut etre reglee entre 7 V et 103 V, de 0,5 V en 0,5 V. (author) [Spanish] En los experimentos de coincidencia lenta-rapida se cuentan generalmente sucesos cuya amplitud de impulso ha sido seleccionada por medio de analizadores de un solo canal. Resulta conveniente lograr que estas tecnicas permitan analizar simultaneamente las energias de varios impulsos, seleccionando sus amplitudes por medio de analizadores de canales multiples. Los analizadores que se emplean en los experimentos de coincidencia multiple deben informar sobre las amplitudes de los impulsos incidentes (ordenandolos en canales de amplitud) tras un intervalo de tiempo bien definido despues de establecido el impulso que se analiza. Se describe un analizador de amplitudes de impulso de 16 canales que permite generar una senal de amplitud de impulso 2,5 x 10{sup -6} s despues de establecido este, con un error inferior a 2 x 10{sup -8} s. El tiempo de resolucion es menor de 5 x 10{sup -6} s y esta controlado por un circuito inspector para evitar distorsiones debidas a la acumulacion de impulsos. La anchura del canal, controlada por un amplificador de ventana, es ajustable entre 1 y 7 V. La posicion del canal puede variarse entre 7 y 103 V a intervalos de 0,5 V. (author) [Russian] Pri obychnykh opytakh s medlennymi i bystrymi sovpadeniyami proizvoditsya otschet velichin, kotorye vybirayutsya po amplitude impul'sov pri pomoshchi odnokanal'nykh analizatorov. Predstavlyaetsya zhelatel'nym rasprostranit' ehti metody na odnovremennyj analiz ehnergii impul'sov, putem otbora impul'sov po amplitude pri pomoshchi mnogokanal'nykh analizatorov. Mnogokanal'nye analizatory, primenyaemye dlya proizvodstva takogo roda opytov s mnogokratnymi sovpadeniyami, dolzhny davat' svedeniya otnositel'no amplitudy postupayushchikh impul'sov (raspredelyaya ikh po amplitudnym kanalam) v tochno opredelennye

  18. Inmunopotenciadores para la acuicultura

    Directory of Open Access Journals (Sweden)

    Rocmira Pérez

    2014-04-01

    Full Text Available La acuicultura es una de las actividades económicas de mayor crecimiento para la producción de alimentos. Uno de sus principales retos es la obtención de grandes volúmenes de producción con la mayor calidad posible. Esto conlleva a una reducción de la aplicación de antibióticos y productos quimioterapéuticos. Una de las estrategias más prometedoras es la aplicación de inmunopotenciadores, principalmente en los cultivos intensivos. El objetivo de este trabajo fue revisar los principales inmunopotenciadores, así como las tendencias y retos de su uso mundial. Se resumen las particularidades moleculares y funcionales de los mismos y se hace énfasis en los más estudiados: levamisol, ß-glucanos, lipopolisacárido, vitamina C, extractos de plantas y hormonas. Todos estos compuestos de naturaleza heterogénea inciden mayoritariamente en los componentes de la inmunidad innata de los peces, fortaleciendo y potenciando la resistencia a enfermedades; adicionalmente algunos de ellos tienen funciones antiestrés y favorecen su crecimiento. Se concluye que los inmunopotenciadores constituyen una estrategia viable para reducir las pérdidas por problemas sanitarios en el sector de la acuicultura; pero aún quedan por solucionar aspectos como la vía de administración y la etapa de inmunización adecuada para cada especie y tipo de cultivo.

  19. Ha vuelto para mirarnos

    OpenAIRE

    Casalderrey, Francisco

    2008-01-01

    En cada entrega analizaremos un cuadro, mirándolo con ojos matemáticos. Con esa particular mirada, fruto de nuestra propia (de)formación. Y desde ese punto de vista haremos paseos por el arte y las matemáticas. Espero que el lector, como hago yo mismo, disfrute descubriendo más allá de lo que a simple vista distinguiría cualquiera. Al fin de cuentas, el arte, como las matemáticas, han sido creados para hacernos disfrutar.

  20. Interfaces para control cerebral

    OpenAIRE

    Spinelli, Enrique Mario

    2000-01-01

    La función de una interfaz para control cerebral basada en señales de electroencefalograma (EEG), en forma general denominada BCI (Brain control Interface), es establecer un enlace directo entre el cerebro y una máquina, sin utilizar acciones motoras directas. Una BCI permite realizar operaciones simples a partir de la interpretación de las señales de EEG. Su desarrollo está principalmente orientado hacia la ayuda a personas con discapacidades motoras severas, que poseen deterioros en el sist...

  1. Comunicar para la salud

    Directory of Open Access Journals (Sweden)

    Lic. Eva Bocco

    1998-01-01

    Full Text Available Con este trabajo quiero plantearles una inquietud en torno al rol que nos cabe a los comunicadores en el área de la salud desde la perspectiva de la comunicación para la salud. ¿Se puede pensar la salud pública desvinculada de la comunicación? ¿La comunicación es posible sin la existencia de salud en la comunidad? ¿Qué puede hacer un comunicador en el ministerio de salud? ¿Puede un estado desarrollar políticas de salud sin la presencia de la comunicación?

  2. Democracia para ciudadanos ciborgs

    Directory of Open Access Journals (Sweden)

    Juan Varela

    2007-07-01

    Full Text Available Enumera los instrumentos imprescindibles de la ciberpolítica para campañas electorales en España, cuando se renovaron los cargos municipales. La política vuelve a ser personal cuando ciudadanos y políticos se hablan cara a cara y cita varios ejemplos, reconociendo la recuperación de la comunicación directa. La ciberdemocracia es muy exigente. Los políticos prefieren la magia de la imagen. La sociedad no sabe como detener la propaganda viral que bombardea a los buscadores de red.

  3. Democracia para ciudadanos ciborgs

    OpenAIRE

    Juan Varela

    2007-01-01

    Enumera los instrumentos imprescindibles de la ciberpolítica para campañas electorales en España, cuando se renovaron los cargos municipales. La política vuelve a ser personal cuando ciudadanos y políticos se hablan cara a cara y cita varios ejemplos, reconociendo la recuperación de la comunicación directa. La ciberdemocracia es muy exigente. Los políticos prefieren la magia de la imagen. La sociedad no sabe como detener la propaganda viral que bombardea a los buscadores de red.

  4. Serie: Madera para construcción Acabados para madera

    OpenAIRE

    Sáenz-Muñoz, Marta; Instituto Tecnológico de Costa Rica

    2012-01-01

    Durante mucho tiempo, la madera ha sido utilizada como material de construcción para resolver principalmente objetivos estructurales; sin embargo, actualmente, el uso de la madera ha tomado mucho auge en la estética de las construcciones, para brindar apariencia y calidez. En la actualidad, el mercado ofrece una amplia gama productos para dar diversos “acabados” a la madera, los cuales sirven para resaltar la belleza de algunas de ellas, realzar características como el color y la veta, o bien...

  5. Hourly temporal distribution of wind

    Science.gov (United States)

    Deligiannis, Ilias; Dimitriadis, Panayiotis; Koutsoyiannis, Demetris

    2016-04-01

    The wind process is essential for hydrometeorology and additionally, is one of the basic renewable energy resources. Most stochastic forecast models are limited up to daily scales disregarding the hourly scale which is significant for renewable energy management. Here, we analyze hourly wind timeseries giving emphasis on the temporal distribution of wind within the day. We finally present a periodic model based on statistical as well as hydrometeorological reasoning that shows good agreement with data. Acknowledgement: This research is conducted within the frame of the undergraduate course "Stochastic Methods in Water Resources" of the National Technical University of Athens (NTUA). The School of Civil Engineering of NTUA provided moral support for the participation of the students in the Assembly.

  6. "Colaborar para Competir"

    Directory of Open Access Journals (Sweden)

    Martha Liliana Hijuelos-Cárdenas

    2015-06-01

    Full Text Available De acuerdo con Michael Porter, los Clusters se definen como “Una agrupación de empresas e instituciones relacionadas entre sí, pertenecientes a un mismo sector o segmento de mercado, que se encuentran próximas geográficamente y que colaboran para ser más competitivas”. Los Clusters son en última instancia una herramienta de competitividad basada en la cooperación de sus miembros, y es una de las estrategias recientes, en el país, para incrementar la productividad y competitividad y las apuestas productivas desde el nivel local. Y es precisamente esta cercanía geográfica de las empresas de un mismo sector, lo que a la vez que genera la competencia entre ellas, también les facilita el acceso a insumos y a conocimientos específicos y en última instancia les permite promover la innovación.

  7. Principios teatrales para docentes

    Directory of Open Access Journals (Sweden)

    R. Irene Arroyo Zúñiga

    2005-01-01

    Full Text Available Este trabajo pretende dar herramientas a los docentes para que puedan utilizarlas como parte de las actividades dentro de un plan de elección, en cualquier disciplina. Además encontrará una exposición de los elementos que componen el arte de la representación escénica, como son: 1. Expresión corporal; es la capacidad de expresar emociones partiendo únicamente de nuestro cuerpo. 2. Impostación; es la habilidad de proyectar la voz sin lastimar las cuerdas vocales. 3. Dicción; es la pronunciación correcta de las palabras. 4. Actuación; es la posibilidad de crear un personaje partiendo de los recursos expresivos y de la forma natural en que el alumno acostumbra a reaccionar. Técnica de improvisación, en éste artículo propongo una serie de seis pasos que pueden ser de gran ayuda a la hora de usar el teatro como recurso didáctico. El teatro a lo largo de la historia ha sido usado para transmitir conocimientos, valores, creencias y todo aspecto inherente a los individuos y su entorno social. Por lo tanto debemos aprovechar al máximo los beneficios que nos ofrece el teatro como educadores

  8. Memory for temporally dynamic scenes.

    Science.gov (United States)

    Ferguson, Ryan; Homa, Donald; Ellis, Derek

    2017-07-01

    Recognition memory was investigated for individual frames extracted from temporally continuous, visually rich film segments of 5-15 min. Participants viewed a short clip from a film in either a coherent or a jumbled order, followed by a recognition test of studied frames. Foils came either from an earlier or a later part of the film (Experiment 1) or from deleted segments selected from random cuts of varying duration (0.5 to 30 s) within the film itself (Experiment 2). When the foils came from an earlier or later part of the film (Experiment 1), recognition was excellent, with the hit rate far exceeding the false-alarm rate (.78 vs. 18). In Experiment 2, recognition was far worse, with the hit rate (.76) exceeding the false-alarm rate only for foils drawn from the longest cuts (15 and 30 s) and matching the false-alarm rate for the 5 s segments. When the foils were drawn from the briefest cuts (0.5 and 1.0 s), the false-alarm rate exceeded the hit rate. Unexpectedly, jumbling had no effect on recognition in either experiment. These results are consistent with the view that memory for complex visually temporal events is excellent, with the integrity unperturbed by disruption of the global structure of the visual stream. Disruption of memory was observed only when foils were drawn from embedded segments of duration less than 5 s, an outcome consistent with the view that memory at these shortest durations are consolidated with expectations drawn from the previous stream.

  9. A Temporal Map of Coaching.

    Science.gov (United States)

    Theeboom, Tim; Van Vianen, Annelies E M; Beersma, Bianca

    2017-01-01

    Economic pressures on companies, technological developments, and less stable career paths pose potential threats to the well-being of employees (e.g., stress, burn-out) and require constant adaptation. In the light of these challenges, it is not surprising that employees often seek the support of a coach. The role of a coach is to foster change by facilitating a coachees' movement through a self-regulatory cycle with the ultimate aim of stimulating sustained well-being and functioning. While meta-analytic research indicates that coaching interventions can be effectively applied to assist employees in dealing with change, the current literature on coaching lacks solid theoretical frameworks that are needed to build a cumulative knowledge-base and to inspire evidence-based practice. In this conceptual analysis, we examine the coaching process through a temporal lens. By doing so, we provide an integrated theoretical framework: a temporal map of coaching. In this framework, we link seminal concepts in psychology to the coaching process, and describe which competencies of coachees are crucial in the different stages of change that coaching aims to bring about. During the preparatory contemplation stage, targeting coachees' awareness by enhancing their mindfulness and environmental receptiveness is important. During the contemplation stage, coachees' willingness and perceived ability to change are central competencies. We propose that coaches should therefore foster intrinsic goal orientation and self-efficacy during this stage. During the planning stage, coaches should focus on goal-setting and implementation intentions. Finally, during the maintenance/termination stage, stimulating coachees' reflection is especially important in order to help them to integrate their learning experiences. The framework delineated in this paper contributes to the understanding of coaching as a tool to assist employees in dealing with the challenges of an increasingly dynamic work

  10. A Temporal Map of Coaching

    Directory of Open Access Journals (Sweden)

    Tim Theeboom

    2017-08-01

    Full Text Available Economic pressures on companies, technological developments, and less stable career paths pose potential threats to the well-being of employees (e.g., stress, burn-out and require constant adaptation. In the light of these challenges, it is not surprising that employees often seek the support of a coach. The role of a coach is to foster change by facilitating a coachees’ movement through a self-regulatory cycle with the ultimate aim of stimulating sustained well-being and functioning. While meta-analytic research indicates that coaching interventions can be effectively applied to assist employees in dealing with change, the current literature on coaching lacks solid theoretical frameworks that are needed to build a cumulative knowledge-base and to inspire evidence-based practice. In this conceptual analysis, we examine the coaching process through a temporal lens. By doing so, we provide an integrated theoretical framework: a temporal map of coaching. In this framework, we link seminal concepts in psychology to the coaching process, and describe which competencies of coachees are crucial in the different stages of change that coaching aims to bring about. During the preparatory contemplation stage, targeting coachees’ awareness by enhancing their mindfulness and environmental receptiveness is important. During the contemplation stage, coachees’ willingness and perceived ability to change are central competencies. We propose that coaches should therefore foster intrinsic goal orientation and self-efficacy during this stage. During the planning stage, coaches should focus on goal-setting and implementation intentions. Finally, during the maintenance/termination stage, stimulating coachees’ reflection is especially important in order to help them to integrate their learning experiences. The framework delineated in this paper contributes to the understanding of coaching as a tool to assist employees in dealing with the challenges of an

  11. High-order passive photonic temporal integrators.

    Science.gov (United States)

    Asghari, Mohammad H; Wang, Chao; Yao, Jianping; Azaña, José

    2010-04-15

    We experimentally demonstrate, for the first time to our knowledge, an ultrafast photonic high-order (second-order) complex-field temporal integrator. The demonstrated device uses a single apodized uniform-period fiber Bragg grating (FBG), and it is based on a general FBG design approach for implementing optimized arbitrary-order photonic passive temporal integrators. Using this same design approach, we also fabricate and test a first-order passive temporal integrator offering an energetic-efficiency improvement of more than 1 order of magnitude as compared with previously reported passive first-order temporal integrators. Accurate and efficient first- and second-order temporal integrations of ultrafast complex-field optical signals (with temporal features as fast as approximately 2.5ps) are successfully demonstrated using the fabricated FBG devices.

  12. SST: Single-Stream Temporal Action Proposals

    KAUST Repository

    Buch, Shyamal; Escorcia, Victor; Shen, Chuanqi; Ghanem, Bernard; Niebles, Juan Carlos

    2017-01-01

    Our paper presents a new approach for temporal detection of human actions in long, untrimmed video sequences. We introduce Single-Stream Temporal Action Proposals (SST), a new effective and efficient deep architecture for the generation of temporal action proposals. Our network can run continuously in a single stream over very long input video sequences, without the need to divide input into short overlapping clips or temporal windows for batch processing. We demonstrate empirically that our model outperforms the state-of-the-art on the task of temporal action proposal generation, while achieving some of the fastest processing speeds in the literature. Finally, we demonstrate that using SST proposals in conjunction with existing action classifiers results in improved state-of-the-art temporal action detection performance.

  13. SST: Single-Stream Temporal Action Proposals

    KAUST Repository

    Buch, Shyamal

    2017-11-09

    Our paper presents a new approach for temporal detection of human actions in long, untrimmed video sequences. We introduce Single-Stream Temporal Action Proposals (SST), a new effective and efficient deep architecture for the generation of temporal action proposals. Our network can run continuously in a single stream over very long input video sequences, without the need to divide input into short overlapping clips or temporal windows for batch processing. We demonstrate empirically that our model outperforms the state-of-the-art on the task of temporal action proposal generation, while achieving some of the fastest processing speeds in the literature. Finally, we demonstrate that using SST proposals in conjunction with existing action classifiers results in improved state-of-the-art temporal action detection performance.

  14. Quantification of soil water evaporation using TDR-microlysimetry

    Science.gov (United States)

    Soil water evaporation is conventionally measured using microlysimeters by evaluating the daily change in mass. Daily removal is laborious and replacement immediately after irrigation events is impractical because of field wetness which leads to delays and an underestimation of evaporation. Irrigati...

  15. Framework TDR for the LHCb Upgrade Technical Design Report

    CERN Document Server

    Bediaga, I; Ferreira Rodrigues, F; Magnin, J; Massafferri, A; Nasteva, I; dos Reis, A C; Amato, S; Carvalho Akiba, K; De Paula, L; Francisco, O; Gandelman, M; Gomes, A; Lopes, J H; Otalora Goicochea, J M; Polycarpo, E; Rangel, M S; Souza De Paula, B; Vieira, D; Göbel, C; Molina Rodriguez, J; Chen, P; Gao, Y; Gong, G; Gong, H; Jing, F; Li, L; Li, Y; Liu, B; Lu, H; Shao, B; Wu, S; Xue, T; Yang, Z; Yuan, X; Zeng, M; Zhang, F; Zhang, Y; Zhong, L; De Bonis, I; Decamp, D; Drancourt, C; Ghez, Ph; Hopchev, P; Lees, J -P; Machikhiliyan, I V; Minard, M -N; Pietrzyk, B; T'Jampens, S; Tisserand, V; Tournefier, E; Vouters, G; Ajaltouni, Z; Chanal, H; Cogneras, E; Deschamps, O; El Rifai, I; Henrard, P; Hoballah, M; Jahjah Hussein, M; Lefèvre, R; Li Gioi, L; Monteil, S; Niess, V; Perret, P; Roa Romero, D A; Sobczak, K; Adrover, C; Aslanides, E; Cachemiche, J -P; Cogan, J; Duval, P -Y; Hachon, F; Khanji, B; Le Gac, R; Leroy, O; Mancinelli, G; Maurice, E; Perrin-Terrin, M; Rethore, F; Sapunov, M; Serrano, J; Tsaregorodtsev, A; Barsuk, S; Beigbeder-Beau, C; Cacérès, T; Callot, O; Charlet, D; Duarte, O; He, J; Jean-Marie, B; Kochebina, O; Lefrançois, J; Machefert, F; Martín Sánchez, A; Nicol, M; Robbe, P; Schune, M -H; Teklishyn, M; Tocut, V; Viaud, B; Videau, I; Ben-Haim, E; Benayoun, M; David, P; Del Buono, L; Martens, A; Polci, F; Brambach, T; Cauet, Ch; Deckenhoff, M; Domke, M; Ekelhof, R; Kaballo, M; Karbach, T M; Kruse, F; Merkel, J; Rudloff, K; Schleich, S; Schlupp, M; Spaan, B; Swientek, S; Warda, K; Wishahi, J; Bauer, C; Britsch, M; Föhr, C; Fontana, M; Fuchs, H; Hofmann, W; Kihm, T; Popov, D; Schmelling, M; Volyanskyy, D; Voss, H; Zavertyaev, M; Bachmann, S; Bien, A; Blouw, J; Dordei, F; Färber, C; Gersabeck, E; Hansmann-Menzemer, S; Jaeger, A; Kreplin, K; Krocker, G; Linn, C; Marks, J; Meissner, M; Nikodem, T; Seyfert, P; Stahl, S; van Tilburg, J; Uwer, U; Wandernoth, S; Wiedner, D; Zhelezov, A; Grünberg, O; Hartmann, T; Voß, C; Waldi, R; Bifani, S; Farry, S; Ilten, P; Kechadi, T; Mathe, Z; McNulty, R; Wallace, R; Zhang, W C; Milanes, D A; Palano, A; Carbone, A; D'Antone, I; Derkach, D; Falabella, A; Galli, D; Lax, I; Marconi, U; Perazzini, S; Vagnoni, V; Valenti, G; Zangoli, M; Bonivento, W; Cadeddu, S; Cardini, A; Lai, A; Manca, G; Oldeman, R; Saitta, B; Baldini, W; Bozzi, C; Evangelisti, F; Landi, L; Mazurov, A; Savrie, M; Squerzanti, S; Vecchi, S; Bizzeti, A; Frosini, M; Graziani, G; Passaleva, G; Veltri, M; Anelli, M; Archilli, F; Bencivenni, G; Campana, P; Ciambrone, P; De Simone, P; Felici, G; Lanfranchi, G; Palutan, M; Saputi, A; Sarti, A; Sciascia, B; Soomro, F; Cardinale, R; Fontanelli, F; Patrignani, C; Petrolini, A; Calvi, M; Furcas, S; Giachero, A; Gotti, C; Kucharczyk, M; Maino, M; Matteuzzi, C; Pessina, G; Carboni, G; De Capua, S; Sabatino, G; Santovetti, E; Satta, A; Alves Jr, A A; Auriemma, G; Bocci, V; Martellotti, G; Penso, G; Pinci, D; Santacesaria, R; Satriano, C; Sciubba, A; Nisar, S; Morawski, P; Polok, G; Witek, M; Muryn, B; Oblakowska-Mucha, A; Senderowska, K; Szumlak, T; Guzik, Z; Nawrot, A; Szczekowski, M; Ukleja, A; Burducea, I; Coca, C; Dogaru, M; Grecu, A; Maciuc, F; Muresan, R; Orlandea, M; Pavel-Nicorescu, C; Popovici, B; Stoica, S; Straticiuc, M; Teodorescu, E; Alkhazov, G; Bochin, B; Bondar, N; Dzyuba, A; Gets, S; Golovtsov, V; Kashchuk, A; Maev, O; Matveev, M; Sagidova, N; Shcheglov, Y; Volkov, S; Vorobyev, A; Balagura, V; Belogurov, S; Belyaev, I; Egorychev, V; Golubkov, D; Kvaratskheliya, T; Savrina, D; Semennikov, A; Shatalov, P; Shevchenko, V; Zhokhov, A; Berezhnoy, A; Bogdanova, G; Komarov, I; Korolev, M; Leflat, A; Nikitin, N; Volkov, V; Zverev, E; Filippov, S; Gushchin, E; Karavichev, O; Kravchuk, L; Kudenko, Y; Laptev, S; Tikhonov, A; Bondar, A; Eidelman, S; Krokovny, P; Kudryavtsev, V; Shekhtman, L; Vorobyev, V; Artamonov, A; Belous, K; Dzhelyadin, R; Guz, Yu; Novoselov, A; Obraztsov, V; Ostankov, A; Romanovsky, V; Shapkin, M; Stenyakin, O; Yushchenko, O; Abellan Beteta, C; Calvo Gomez, M; Camboni, A; Casajus Ramo, A; Comerma-Montells, A; Domingo Bonal, F; Garrido, L; Gascon, D; Grabalosa Gándara, M; Graciani Diaz, R; Graugés, E; Lopez Asamar, E; Mauricio, J; Mendez-Munoz, V; Pérez-Calero Yzquierdo, A; Picatoste Olloqui, E; Pie Valls, B; Potterat, C; Puig Navarro, A; Rosello, M; Ruiz, H; Vazquez Gomez, R; Vilasis-Cardona, X; Adeva, B; Alvarez Cartelle, P; Cid Vidal, X; Dosil Suárez, A; Esperante Pereira, D; Fernandez Albor, V; Gallas Torreira, A; Hernando Morata, J A; Pazos Alvarez, A; Perez Trigo, E; Plo Casasus, M; Rodriguez Perez, P; Saborido Silva, J J; Sanmartin Sedes, B; Santamarina Rios, C; Seco, M; Vazquez Regueiro, P; Visniakov, J; Albrecht, J; Alessio, F; Barschel, C; Blake, T; Bonaccorsi, E; Brarda, L; Buytaert, J; Cattaneo, M; Chadaj, B; Charpentier, Ph; Chebbi, M; Ciba, K; Clemencic, M; Closier, J; Collins, P; Corajod, B; Corti, G; Couturier, B; D'Ambrosio, C; Decreuse, G; Dijkstra, H; Dumps, R; Ferro-Luzzi, M; Forty, R; Fournier, C; Frank, M; Frei, C; Gaspar, C; Gersabeck, M; Gligorov, V V; Granado Cardoso, L A; Gys, T; Haen, C; van Herwijnen, E; Jacobsson, R; Jamet, O; Jost, B; Karacson, M; Kristic, R; Lacarrere, D; Lanciotti, E; Langenbruch, C; Lindner, R; Liu, G; Martinez Santos, D; Matev, R; Neufeld, N; Panman, J; Pepe Altarelli, M; Piedigrossi, D; Rauschmayr, N; Roiser, S; Roy, L; Ruf, T; Schindler, H; Schmidt, B; Schneider, T; Schopper, A; Schwemmer, R; Stagni, F; Subbiah, V K; Teubert, F; Thomas, E; Tonelli, D; Ubeda Garcia, M; Ullaland, O; Vesterinen, M; Wicht, J; Witzeling, W; Wyllie, K; Zvyagin, A; Amhis, Y; Bay, A; Bernard, F; Blanc, F; Bressieux, J; Cowan, G A; Degaudenzi, H; Dupertuis, F; Fave, V; Frei, R; Gauvin, N; Haefeli, G; Jaton, P; Keune, A; Knecht, M; La Thi, V N; Lopez-March, N; Luisier, J; Märki, R; Muster, B; Nakada, T; Nguyen, A D; Nguyen-Mau, C; Prisciandaro, J; Rakotomiaramanana, B; Rouvinet, J; Schneider, O; Szczypka, P; Tourneur, S; Tran, M T; Veneziano, G; Anderson, J; Bernet, R; Büchler-Germann, A; Bursche, A; Chiapolini, N; De Cian, M; Elsasser, Ch; Müller, K; Palacios, J; Salzmann, C; Saornil Gamarra, S; Serra, N; Steinkamp, O; Straumann, U; Tobin, M; Vollhardt, A; Aaij, R; Ali, S; Band, H; Bauer, Th; van Beuzekom, M; van Beveren, V; Boer Rookhuizen, H; Ceelie, L; Coco, V; David, P N Y; De Bruyn, K; De Groen, P; van Eijk, D; Farinelli, C; Gromov, V; van der Heijden, B; Heijne, V; Hulsbergen, W; Jans, E; Jansen, F; Jansen, L; Jansweijer, P; Kluit, R; Koppenburg, P; Kozlinskiy, A; van Leerdam, J; Martinelli, M; Merk, M; Mous, I; Munneke, B; Oggero, S; van Overbeek, M; Pellegrino, A; van Petten, O; Roeland, E; de Roo, K; Schimmel, A; Schuijlenburg, H; Sluijk, T; Storaci, B; Tsopelas, P; Tuning, N; Vink, W; Wenerke, P; Wiggers, L; Zappon, F; Zwart, A; van den Brand, J; Dettori, F; Ketel, T; Koopman, R F; Kos, J; Lambert, R W; Mul, F; Raven, G; Schiller, M; Tolk, S; Dovbnya, A; Kandybei, S; Raniuk, I; Shapoval, I; Shevchenko, O; Iakovenko, V; Nikolaiko, Y; Okhrimenko, O; Pugatch, M; Pugatch, V; Faulkner, P J W; Kenyon, I R; Lazzeroni, C; McCarthy, J; Slater, M W; Watson, N K; Adinolfi, M; Benton, J; Brook, N H; Cook, A; Coombes, M; Hampson, T; Harnew, S T; Naik, P; Rademacker, J H; Solomin, A; Souza, D; Velthuis, J J; Voong, D; Barter, W; Bettler, M -O; Cliff, H V; Garra Tico, J; Gibson, V; Gregson, S; Haines, S C; Jones, C R; Sigurdsson, S; Ward, D R; Wotton, S A; Wright, S; Back, J J; Craik, D; Dossett, D; Gershon, T; Kreps, M; Latham, T; Pilař, T; Poluektov, A; Reid, M M; Silva Coutinho, R; Whitehead, M; Williams, M P; Easo, S; Nandakumar, R; Papanestis, A; Patrick, G N; Ricciardi, S; Wilson, F F; Benson, S; Clarke, P E L; Currie, R; Eisenhardt, S; Fitzpatrick, C; Lambert, D; Luo, H; Mejia, H; Muheim, F; Needham, M; Playfer, S; Sparkes, A; Xie, Y; Alexander, M; Beddow, J; Borghi, S; Eklund, L; Hynds, D; Ogilvy, S; Pappagallo, M; Rodrigues, E; Sail, P; Soler, F J P; Spradlin, P; Bowcock, T J V; Brown, H; Casse, G; Donleavy, S; Hennessy, K; Hicks, E; Huse, T; Hutchcroft, D; Liles, M; Patel, G D; Rinnert, K; Shears, T; Smith, N A; Carson, L; Ciezarek, G; Cunliffe, S; Egede, U; Golutvin, A; Hall, S; Owen, P; Parkinson, C J; Patel, M; Petridis, K; Richards, A; Savidge, T; Sepp, I; Shires, A; Websdale, D; Williams, M; Appleby, R B; Barlow, R J; Bird, T; Bjørnstad, P M; Brett, D; Harrison, J; Lafferty, G; McGregor, G; Moran, D; Parkes, C; Smith, M; Webber, A D; Brock, M; Charles, M; Harnew, N; John, J J; John, M; Malde, S; Nomerotski, A; Powell, A; Thomas, C; Topp-Joergensen, S; Wilkinson, G; Meadows, B; Sokoloff, M D; Artuso, M; Blusk, S; Borgia, A; Britton, T; Garofoli, J; Gui, B; Hadjivasiliou, C; Mountain, R; Pal, B K; Phan, A; Qian, W; Skwarnicki, T; Stone, S; Wang, J; Xing, Z; Zhang, L

    2012-01-01

    This document is a Framework Technical Design Report for the upgrade of the LHCb experiment. It adds to the information in the Letter of Intent, in particular concerning the foreseen schedule, cost and participating institutes. Updates are given for the physics performance, based on the experience gained with the first full year of data taking, on the detector requirements and the progress of the sub-system R&D. Within the framework presented here, it is expected that the individual sub-system TDRs will follow on completion of the R&D phase in the next year.

  16. Geographic and temporal trends in the molecular epidemiology and genetic mechanisms of transmitted HIV-1 drug resistance: an individual-patient- and sequence-level meta-analysis.

    Science.gov (United States)

    Rhee, Soo-Yon; Blanco, Jose Luis; Jordan, Michael R; Taylor, Jonathan; Lemey, Philippe; Varghese, Vici; Hamers, Raph L; Bertagnolio, Silvia; Rinke de Wit, Tobias F; Aghokeng, Avelin F; Albert, Jan; Avi, Radko; Avila-Rios, Santiago; Bessong, Pascal O; Brooks, James I; Boucher, Charles A B; Brumme, Zabrina L; Busch, Michael P; Bussmann, Hermann; Chaix, Marie-Laure; Chin, Bum Sik; D'Aquin, Toni T; De Gascun, Cillian F; Derache, Anne; Descamps, Diane; Deshpande, Alaka K; Djoko, Cyrille F; Eshleman, Susan H; Fleury, Herve; Frange, Pierre; Fujisaki, Seiichiro; Harrigan, P Richard; Hattori, Junko; Holguin, Africa; Hunt, Gillian M; Ichimura, Hiroshi; Kaleebu, Pontiano; Katzenstein, David; Kiertiburanakul, Sasisopin; Kim, Jerome H; Kim, Sung Soon; Li, Yanpeng; Lutsar, Irja; Morris, Lynn; Ndembi, Nicaise; Ng, Kee Peng; Paranjape, Ramesh S; Peeters, Martine; Poljak, Mario; Price, Matt A; Ragonnet-Cronin, Manon L; Reyes-Terán, Gustavo; Rolland, Morgane; Sirivichayakul, Sunee; Smith, Davey M; Soares, Marcelo A; Soriano, Vincent V; Ssemwanga, Deogratius; Stanojevic, Maja; Stefani, Mariane A; Sugiura, Wataru; Sungkanuparph, Somnuek; Tanuri, Amilcar; Tee, Kok Keng; Truong, Hong-Ha M; van de Vijver, David A M C; Vidal, Nicole; Yang, Chunfu; Yang, Rongge; Yebra, Gonzalo; Ioannidis, John P A; Vandamme, Anne-Mieke; Shafer, Robert W

    2015-04-01

    Regional and subtype-specific mutational patterns of HIV-1 transmitted drug resistance (TDR) are essential for informing first-line antiretroviral (ARV) therapy guidelines and designing diagnostic assays for use in regions where standard genotypic resistance testing is not affordable. We sought to understand the molecular epidemiology of TDR and to identify the HIV-1 drug-resistance mutations responsible for TDR in different regions and virus subtypes. We reviewed all GenBank submissions of HIV-1 reverse transcriptase sequences with or without protease and identified 287 studies published between March 1, 2000, and December 31, 2013, with more than 25 recently or chronically infected ARV-naïve individuals. These studies comprised 50,870 individuals from 111 countries. Each set of study sequences was analyzed for phylogenetic clustering and the presence of 93 surveillance drug-resistance mutations (SDRMs). The median overall TDR prevalence in sub-Saharan Africa (SSA), south/southeast Asia (SSEA), upper-income Asian countries, Latin America/Caribbean, Europe, and North America was 2.8%, 2.9%, 5.6%, 7.6%, 9.4%, and 11.5%, respectively. In SSA, there was a yearly 1.09-fold (95% CI: 1.05-1.14) increase in odds of TDR since national ARV scale-up attributable to an increase in non-nucleoside reverse transcriptase inhibitor (NNRTI) resistance. The odds of NNRTI-associated TDR also increased in Latin America/Caribbean (odds ratio [OR] = 1.16; 95% CI: 1.06-1.25), North America (OR = 1.19; 95% CI: 1.12-1.26), Europe (OR = 1.07; 95% CI: 1.01-1.13), and upper-income Asian countries (OR = 1.33; 95% CI: 1.12-1.55). In SSEA, there was no significant change in the odds of TDR since national ARV scale-up (OR = 0.97; 95% CI: 0.92-1.02). An analysis limited to sequences with mixtures at less than 0.5% of their nucleotide positions—a proxy for recent infection—yielded trends comparable to those obtained using the complete dataset. Four NNRTI SDRMs—K101E, K103N, Y181C, and G190A

  17. Temporal Lobe Epilepsy Surgery Failures: A Review

    Science.gov (United States)

    Harroud, Adil; Bouthillier, Alain; Weil, Alexander G.; Nguyen, Dang Khoa

    2012-01-01

    Patients with temporal lobe epilepsy (TLE) are refractory to antiepileptic drugs in about 30% of cases. Surgical treatment has been shown to be beneficial for the selected patients but fails to provide a seizure-free outcome in 20–30% of TLE patients. Several reasons have been identified to explain these surgical failures. This paper will address the five most common causes of TLE surgery failure (a) insufficient resection of epileptogenic mesial temporal structures, (b) relapse on the contralateral mesial temporal lobe, (c) lateral temporal neocortical epilepsy, (d) coexistence of mesial temporal sclerosis and a neocortical lesion (dual pathology); and (e) extratemporal lobe epilepsy mimicking TLE or temporal plus epilepsy. Persistence of epileptogenic mesial structures in the posterior temporal region and failure to distinguish mesial and lateral temporal epilepsy are possible causes of seizure persistence after TLE surgery. In cases of dual pathology, failure to identify a subtle mesial temporal sclerosis or regions of cortical microdysgenesis is a likely explanation for some surgical failures. Extratemporal epilepsy syndromes masquerading as or coexistent with TLE result in incomplete resection of the epileptogenic zone and seizure relapse after surgery. In particular, the insula may be an important cause of surgical failure in patients with TLE. PMID:22934162

  18. Optimization of temporal networks under uncertainty

    CERN Document Server

    Wiesemann, Wolfram

    2012-01-01

    Many decision problems in Operations Research are defined on temporal networks, that is, workflows of time-consuming tasks whose processing order is constrained by precedence relations. For example, temporal networks are used to model projects, computer applications, digital circuits and production processes. Optimization problems arise in temporal networks when a decision maker wishes to determine a temporal arrangement of the tasks and/or a resource assignment that optimizes some network characteristic (e.g. the time required to complete all tasks). The parameters of these optimization probl

  19. Bases para proyectiles dirigidos

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1959-03-01

    Full Text Available Aunque actualmente no se ha llegado a una línea general de métodos o sistemas que gobiernen un tipo característico de rampa y servicios auxiliares necesarios para el lanzamiento al espacio de proyectiles dirigidos a grandes alturas y distancias, las experiencias obtenidas en diferentes ensayos, utilizando distintos tipos de proyectiles y trayectorias balísticas, han sentado toda una serie de procedimientos, datos y conclusiones de gran valor balístico que, aun teniendo en cuenta la continua evolución del proyectil, sus formas, combustibles y alcances, se conocen ya, con bastante aproximación, las condiciones mínimas que ha de reunir una base dedicada a este tipo de lanzamientos.

  20. Registrar para avanzar

    Directory of Open Access Journals (Sweden)

    Laia Matarranz Torres

    2017-06-01

    Full Text Available El farmacéutico comunitario es un profesional sanitario con un enorme potencial para mejorar no solo el uso de los medicamentos (detectando, por ejemplo, resultados negativos de la medicación, sino también la prevención de enfermedades y la promoción de la salud pública. Sin duda, el desarrollo y el impulso que están teniendo los servicios profesionales farmacéuticos (SPF desde hace años pueden contribuir decisivamente a que este potencial se consolide de una forma definitiva, obteniendo el reconocimiento del conjunto del sistema sanitario, incluyendo tanto a otros profesionales de la salud (médicos, enfermería, medicina especializada… como a la Administración y, por supuesto, a los propios pacientes beneficiarios de estos servicios. Es cierto que la figura del farmacéutico y su ejercicio sanitario han estado tradicionalmente bien considerados por la población, pero no es menos verdad que la integración de la actividad asistencial de la farmacia comunitaria en el Sistema Nacional de Salud (SNS es, cuanto menos mejorable, y que, incluso, algunas manifestaciones ponen en entredicho de vez en cuando la labor científico-asistencial de las farmacias o generan dudas sobre su capacidad para formar parte de pleno derecho de los equipos de salud que deben trabajar de forma coordinado en la mejora de la atención sanitaria de los pacientes.

  1. Computed tomography of temporal bone fractures and temporal region anatomy in horses.

    Science.gov (United States)

    Pownder, S; Scrivani, P V; Bezuidenhout, A; Divers, T J; Ducharme, N G

    2010-01-01

    In people, specific classifications of temporal bone fractures are associated with clinical signs and prognosis. In horses, similar classifications have not been evaluated and might be useful establishing prognosis or understanding pathogenesis of certain types of trauma. We hypothesized associations between temporal bone fracture location and orientation in horses detected during computed tomography (CT) and frequency of facial nerve (CN7) deficit, vestibulocochlear nerve (CN8) deficit, or temporohyoid osteoarthropathy (THO). Complex temporal region anatomy may confound fracture identification, and consequently a description of normal anatomy was included. All horses undergoing temporal region CT at our hospital between July 1998 and May 2008. Data were collected retrospectively, examiners were blinded, and relationships were investigated among temporal bone fractures, ipsilateral THO, ipsilateral CN7, or ipsilateral CN8 deficits by Chi-square or Fischer's exact tests. Seventy-nine horses had CT examinations of the temporal region (158 temporal bones). Sixteen temporal bone fractures were detected in 14 horses. Cranial nerve deficits were seen with fractures in all parts of the temporal bone (petrosal, squamous, and temporal) and, temporal bone fractures were associated with CN7 and CN8 deficits and THO. No investigated fracture classification scheme, however, was associated with specific cranial nerve deficits. Without knowledge of the regional anatomy, normal structures may be mistaken for a temporal bone fracture or vice versa. Although no fracture classification scheme was associated with the assessed clinical signs, simple descriptive terminology (location and orientation) is recommended for reporting and facilitating future comparisons.

  2. An Algebraic Framework for Temporal Attribute Characteristics

    DEFF Research Database (Denmark)

    Böhlen, M. H.; Gamper, J.; Jensen, Christian Søndergaard

    2006-01-01

    Most real-world database applications manage temporal data, i.e., data with associated time references that capture a temporal aspect of the data, typically either when the data is valid or when the data is known. Such applications abound in, e.g., the financial, medical, and scientific domains...

  3. Schneiderian papilloma of the temporal bone

    NARCIS (Netherlands)

    van der Putten, L.; Bloemena, E.; Merkus, P.; Hensen, E.F.

    2013-01-01

    Temporal bone Schneiderian papilloma may present as a primary tumour originating from the middle ear and mastoid process, or an extension from sinonasal disease. Both forms are rare, this being only the 18th case of primary temporal bone Schneiderian papilloma described to date. Although the current

  4. Temporal logics and real time expert systems

    NARCIS (Netherlands)

    Blom, J.A.

    1996-01-01

    This paper introduces temporal logics. Due to the eternal compromise between expressive adequacy and reasoning efficiency that must decided upon in any application, full (first order logic or modal logic based) temporal logics are frequently not suitable. This is especially true in real time expert

  5. A Temporal Ratio Model of Memory

    Science.gov (United States)

    Brown, Gordon D. A.; Neath, Ian; Chater, Nick

    2007-01-01

    A model of memory retrieval is described. The model embodies four main claims: (a) temporal memory--traces of items are represented in memory partly in terms of their temporal distance from the present; (b) scale-similarity--similar mechanisms govern retrieval from memory over many different timescales; (c) local distinctiveness--performance on a…

  6. Quantifying temporal ventriloquism in audiovisual synchrony perception

    NARCIS (Netherlands)

    Kuling, I.A.; Kohlrausch, A.G.; Juola, J.F.

    2013-01-01

    The integration of visual and auditory inputs in the human brain works properly only if the components are perceived in close temporal proximity. In the present study, we quantified cross-modal interactions in the human brain for audiovisual stimuli with temporal asynchronies, using a paradigm from

  7. Temporal Convergence for Knowledge Management

    Directory of Open Access Journals (Sweden)

    Christopher Phillip Martin

    2008-05-01

    Full Text Available Time and knowledge have tended to be conceptualised in conventional knowledge management systems as either ‘timeless’ recordings of procedures, or time-stamped records of past events and states. The concept of temporal convergence was previously developed to help apply knowledge-management theory to complex military processes such as commander’s intent, shared situation awareness, and self-synchronisation. This paper clarifies the concept and introduces several others in forming a framework to assist discussion and exploration of the types of knowledge required for complex endeavours, such as warfighting, characterised by opposition and uncertainty. The approach is grounded in a pragmatist philosophy and constructivist epistemology. Argument proceeds along mathematical lines from a basis that the types of knowledge most valuable to goal-directed agents in uncertain environments can be modelled as directed graph topologies. The framework is shown to be useful in describing and reasoning about the knowledge requirements and prerequisites for distributed decision-making through the sharing of situational knowledge and common intentions, with practical application to the planning and execution of operations. To the designers of knowledge management systems seeking to address this space, it presents a challenge that cannot be addressed merely by construction, storage, search and retrieval of documents and records pertaining to the past.

  8. Correlated Temporal and Spectral Variability

    Science.gov (United States)

    Swank, Jean H.

    2007-01-01

    The variability of neutron star and black hole X-ray sources has several dimensions, because of the roles played by different important time-scales. The variations on time scales of hours, weeks, and months, ranging from 50% to orders of magnitude, arise out of changes in the flow in the disk. The most important driving forces for those changes are probably various possible instabilities in the disk, though there may be effects with other dominant causes. The changes in the rate of flow appear to be associated with changes in the flow's configuration, as the accreting material approaches the compact object, for there are generally correlated changes in both the Xray spectra and the character of the faster temporal variability. There has been a lot of progress in tracking these correlations, both for Z and Atoll neutron star low-mass X-ray binaries, and for black hole binaries. I will discuss these correlations and review briefly what they tell us about the physical states of the systems.

  9. The para-petroleum industry

    International Nuclear Information System (INIS)

    2002-07-01

    The para-petroleum industry includes societies that realize studies and installations for the deposits exploitation. This document presents the situation of the para-petroleum industry in 2001, the world investment growth of the activity, the french societies financial results and an inventory of the main operations in the amalgamation domain. (A.L.B.)

  10. Desempenho de diferentes guias de ondas para uso com o analisador de umidade TRASE Performance of different waveguides for use with the TRASE water content analyser

    Directory of Open Access Journals (Sweden)

    Eugênio F. Coelho

    2001-04-01

    Full Text Available O trabalho teve como objetivo avaliar a relação entre a umidade e a constante dielétrica aparente do solo e diferentes guias de onda para uso com o analisador de umidade Trase, que opera de acordo com o princípio da reflectometria no domínio do tempo - TDR. Amostras indeformadas e deformadas de duas manchas de textura diferente de um Latossolo Amarelo Distrófico foram retiradas do campo e acondicionadas em recipientes de 10 L, perfazendo quatro repetições para cada textura e estrutura. Foram construídas três diferentes guias de onda, com hastes de 0,15 m, sendo uma com capacitor e uma sem capacitor no início da guia, com espaçamento de 0,009 m entre hastes e outra sem capacitor, com espaçamento de 0,022 m entre hastes. Essas guias de onda, juntamente com guias originais do fabricante com hastes de 0,20 m, espaçadas 0,022 m, foram inseridas individualmente em cada recipiente. Dados de umidade obtidos gravimetricamente e pelo analisador TRASE, e da constante dielétrica, foram tomados usando-se todas as guias de onda em cada recipiente durante a secagem do solo, de 0,35 m³ m-3 a 0,10 m³ m-3. Três modelos matemáticos foram ajustados aos dados de umidade e da correspondente constante dielétrica do solo gerados pelas guias de onda do fabricante. Um modelo exponencial foi considerado como mais adequado para estimativas dos teores de água, em função da constante dielétrica para a guia de onda do fabricante. Todas as guias de onda avaliadas apresentam viabilidade de uso, desde que previamente calibradas.The objective of this work was to evaluate the relations between soil water content and the soil bulk dielectric constant, and to study different waveguides of a TRASE soil water content analyzer that operates according to TDR principles. Non-destructive and destructive samples of two sites of different texture of a Dystrophic Yellow Latossol were collected and packed into 10 L containers, resulting in four replications for each

  11. Brasil: desafios para uma história ambiental

    Directory of Open Access Journals (Sweden)

    Paulo Henrique Martinez

    2005-04-01

    Full Text Available Este artículo busca identificar sentidos para el estudio del medio ambiente en una perspectiva temporal por parte de los historiadores; de qué manera los cambios sociales en el pasaje del siglo XX hacia el XXI tocaran a los objetos, métodos de investigación y a la enseñanza de Historia en distintas partes de mundo y en Brasil; los retos teóricos, las necesidades y las posibilidades de diálogo intelectual abiertos en las últimas décadas.

  12. BRASIL: DESAFIOS PARA UMA HISTÓRIA AMBIENTAL

    Directory of Open Access Journals (Sweden)

    Paulo Henrique Martinez

    2005-01-01

    Full Text Available Este artículo busca identificar sentidos para el estudio del medio ambiente en una perspectiva temporal por parte de los historiadores; de qué manera los cambios sociales en el pasaje del siglo XX hacia el XXI tocaran a los objetos, métodos de investigación y a la enseñanza de Historia en distintas partes de mundo y en Brasil; los retos teóricos, las necesidades y las posibilidades de diálogo intelectual abiertos en las últimas décadas.

  13. Temporal self-splitting of optical pulses

    Science.gov (United States)

    Ding, Chaoliang; Koivurova, Matias; Turunen, Jari; Pan, Liuzhan

    2018-05-01

    We present mathematical models for temporally and spectrally partially coherent pulse trains with Laguerre-Gaussian and Hermite-Gaussian Schell-model statistics as extensions of the standard Gaussian Schell model for pulse trains. We derive propagation formulas of both classes of pulsed fields in linearly dispersive media and in temporal optical systems. It is found that, in general, both types of fields exhibit time-domain self-splitting upon propagation. The Laguerre-Gaussian model leads to multiply peaked pulses, while the Hermite-Gaussian model leads to doubly peaked pulses, in the temporal far field (in dispersive media) or at the Fourier plane of a temporal system. In both model fields the character of the self-splitting phenomenon depends both on the degree of temporal and spectral coherence and on the power spectrum of the field.

  14. Microsurgical techniques in temporal lobe epilepsy.

    Science.gov (United States)

    Alonso Vanegas, Mario A; Lew, Sean M; Morino, Michiharu; Sarmento, Stenio A

    2017-04-01

    Temporal lobe resection is the most prevalent epilepsy surgery procedure. However, there is no consensus on the best surgical approach to treat temporal lobe epilepsy. Complication rates are low and efficacy is very high regarding seizures after such procedures. However, there is still ample controversy regarding the best surgical approach to warrant maximum seizure control with minimal functional deficits. We describe the most frequently used microsurgical techniques for removal of both the lateral and mesial temporal lobe structures in the treatment of medically intractable temporal lobe epilepsy (TLE) due to mesial temporal sclerosis (corticoamygdalohippocampectomy and selective amygdalohippocampectomy). The choice of surgical technique appears to remain a surgeon's preference for the near future. Meticulous surgical technique and thorough three-dimensional microsurgical knowledge are essentials for obtaining the best results. Wiley Periodicals, Inc. © 2017 International League Against Epilepsy.

  15. Temporal maps and informativeness in associative learning.

    Science.gov (United States)

    Balsam, Peter D; Gallistel, C Randy

    2009-02-01

    Neurobiological research on learning assumes that temporal contiguity is essential for association formation, but what constitutes temporal contiguity has never been specified. We review evidence that learning depends, instead, on learning a temporal map. Temporal relations between events are encoded even from single experiences. The speed with which an anticipatory response emerges is proportional to the informativeness of the encoded relation between a predictive stimulus or event and the event it predicts. This principle yields a quantitative account of the heretofore undefined, but theoretically crucial, concept of temporal pairing, an account in quantitative accord with surprising experimental findings. The same principle explains the basic results in the cue competition literature, which motivated the Rescorla-Wagner model and most other contemporary models of associative learning. The essential feature of a memory mechanism in this account is its ability to encode quantitative information.

  16. MR imaging in temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Fobben, E.S.; Zimmerman, R.A.; Sperling, M.R.; Kohn, M.I.; Atlas, S.W.; Hackney, D.B.; Goldberg, H.I.; Bilaniuk, L.T.; Grossman, R.I.

    1988-01-01

    MR imaging examinations of 31 patients undergoing temporal lobe resection for refractory partial epilepsy were reviewed retrospectively for the presence of signal abnormalities as well as atrophy. High-signal abnormalities were present in only two of the described 31 patients (6.5%). Pathologically, these represented mesial temporal sclerosis and a hamartoma. Of the remaining 29 cases, 13 showed pathologically varying degrees of mesial temporal sclerosis and gliosis and 16 were pathologically normal. Atrophy, as determined by gross asymmetry, sulcal and temporal horn enlargement, and computer volume measurements, was observed in 23 of 31 patients, correlating with the clinically affected side in 20 and the contralateral side in three. In this series, in contrast to others reported, focal MR signal abnormalities were not detected in the vast majority of patients with mesial temporal sclerosis

  17. Binocular rivalry produced by temporal frequency differences

    Directory of Open Access Journals (Sweden)

    David eAlais

    2012-07-01

    Full Text Available Binocular rivalry occurs when each eye views images that are markedly different. Rather than seeing a binocular fusion of the two, each image is seen exclusively in a stochastic alternation of the monocular images. Here we examine whether temporal frequency differences will trigger binocular rivalry by presenting two random dot arrays that are spatially matched but which modulate temporally at two different rates and contained no net translation. We found that a perceptual alternation between the two temporal frequencies did indeed occur, provided the frequencies were sufficiently different, indicating that temporal information can produce binocular rivalry in the absence of spatial conflict. This finding is discussed with regard to the dependence of rivalry on conflict between spatial and temporal channels.

  18. Temporal Feature Integration for Music Organisation

    DEFF Research Database (Denmark)

    Meng, Anders

    2006-01-01

    This Ph.D. thesis focuses on temporal feature integration for music organisation. Temporal feature integration is the process of combining all the feature vectors of a given time-frame into a single new feature vector in order to capture relevant information in the frame. Several existing methods...... for handling sequences of features are formulated in the temporal feature integration framework. Two datasets for music genre classification have been considered as valid test-beds for music organisation. Human evaluations of these, have been obtained to access the subjectivity on the datasets. Temporal...... ranking' approach is proposed for ranking the short-time features at larger time-scales according to their discriminative power in a music genre classification task. The multivariate AR (MAR) model has been proposed for temporal feature integration. It effectively models local dynamical structure...

  19. Tratamento do aneurisma aterosclerótico da artéria temporal superficial: relato de caso

    Directory of Open Access Journals (Sweden)

    Paula Dayana Matkovski

    2015-09-01

    Full Text Available ResumoAneurismas da artéria temporal superficial são incomuns segundo a literatura. A grande maioria é secundária a traumatismos ou cirurgia na região temporal, sendo que 95% dos casos evoluem para pseudoaneurismas. Entretanto, os aneurismas verdadeiros ou espontâneos são extremamente raros e representam 8% dos casos de aneurismas da artéria temporal superficial, sendo estes, geralmente, de origem aterosclerótica. Aneurismas temporais espontâneos podem coexistir com outras lesões vasculares, incluindo aneurismas intracranianos. Nosso relato trata de um paciente com aneurisma de artéria temporal superficial esquerda, de origem aterosclerótica, no qual foi realizada a excisão cirúrgica, sob anestesia geral.

  20. Para-bosons and Para-fermions in Quantum Mechanics

    International Nuclear Information System (INIS)

    Cattani, M.S.D.; Fernandes, N.C.

    1982-01-01

    Within the framework of the ordinary quantum mechanics, a detailed study of the energy eigenfunctions of N identical particles using the irreducible representations of the permutation group in the Hilbert space is performed. It is shown that the para-states, as occurs with the boson and fermion states, are compatible with the postulates of quantum mechanics and with the principle of indistinguishability. A mathematical support for the existence of para-bosons and para-fermions is given. Gentile's quantum statistics is, in a certain sense, justified. (Author) [pt

  1. Generating para-water from para-hydrogen: A Gedankenexperiment.

    Science.gov (United States)

    Ivanov, Konstantin L; Bodenhausen, Geoffrey

    2018-07-01

    A novel conceptual approach is described that is based on the transfer of hyperpolarization from para-hydrogen in view of generating a population imbalance between the two spin isomers of H 2 O. The approach is analogous to SABRE (Signal Amplification By Reversible Exchange) and makes use of the transfer of spin order from para-hydrogen to H 2 O in a hypothetical organometallic complex. The spin order transfer is expected to be most efficient at avoided level crossings. The highest achievable enrichment levels of para- and ortho-water are discussed. Copyright © 2018 Elsevier Inc. All rights reserved.

  2. Temporal plus epilepsy: Anatomo-electroclinical subtypes

    Science.gov (United States)

    Andrade-Machado, René; Benjumea-Cuartas, Vanessa

    2016-01-01

    Background: Mesial temporal lobe epilepsy (TLE) is a remediable epileptic syndrome. About 40% of patients continue to have seizures after standard temporal lobectomy. It has been suggested that some of these patients could actually suffer from a more complex epileptogenic network. Because a few papers have been dedicated to this topic, we decided to write an article updating this theme. Methods: We performed a literature search using the following terminology: “temporal plus epilepsy and networks,” “temporal plus epilepsy,” “orbito-temporal epilepsy,” “temporo-insular epilepsy,” “temporo-parieto-occipital (TPO) epilepsy,” “parieto-temporal epilepsy,” “intracortical evoked potential and temporal plus epilepsy,” “temporal lobe connectivity and epilepsy,” “intracortical evoked potential and epilepsy surgery,” “role of extratemporal structures in TLE,” “surgical failure after temporal lobectomy,” “Diffusion tensor imaging (DTI) and temporal epilepsy,” and “positron emission tomography (PET) in temporal plus lobe epilepsy” in the existing PubMed databases. We searched only English and Spanish literature. Only papers that fit with the above-mentioned descriptors were included as part of the evidence. Other articles were used to reference some aspects of the temporal plus epilepsy. Results: A total of 48 papers from 2334 were revised. The most frequently reported auras in these groups of patients are gustatory hallucinations, vestibular illusions, laryngeal and throat constriction, atypical distribution of somatosensory symptoms (perioral and hands, bilaterally hands paresthesias, trunk and other). The most common signs are tonic posturing, hemifacial twist, and frequent bilateral clonic movements. Interictal electroencephalographic (EEG) patterns exhibit regional and frequently bilateral spikes and/or slow waves. The first ictal electrographic change is mostly regional. It is important to note that the evidence is

  3. Para compreender a ciberliteratura

    Directory of Open Access Journals (Sweden)

    Lucia Santaella

    2012-12-01

    Full Text Available http://dx.doi.org/10.5007/1807-9288.2012v8n2p229   Mediante as mídias digitais, a configuração da literatura sofreu um salto qualitativo em todos os seus aspectos. O espaço virtual gerado pelas redes de computadores funciona como um novo meio. Abre-se com ele uma miríade de oportunidades que expandem o conceito de literatura em função da emergência de novas formas de criação literária. Disso decorre que a criação, a teoria e a crítica literárias exigem a redefinição de seus paradigmas herdados da era de Gutenberg. Tendo isso em vista, este artigo está voltado para a construção textual e hipertextual no espaço digital, o que implica uma exploração do que é ciberliteratura, em que ela se cruza e em que diverge da literatura impressa, que estratégias significantes a caracterizam e como essas estratégias são interpretadas pelos usuários na sua busca de significado.

  4. para promover la salud

    Directory of Open Access Journals (Sweden)

    Ma. del Consuelo Chapela

    2002-01-01

    Full Text Available Hablar de educación a distancia sustentada en el desarrollo de la cibernética obliga a reflexionar sobre sus definiciones, objetivos y medios, especialmente si pensamos en las necesidades de la fracción de población que no tiene acceso a las posibilidades que ofrece el desarrollo tecnológico. En este trabajo se presenta e ilustra con un ejemplo práctico, una perspectiva sobre las posibilidades de la educación a distancia desde las necesidades de la promoción de la salud entre grupos de población marginada en el mundo virtual. Se propone la creación de bibliotecas itinerantes regionales que pongan a disposición de la población con acceso limitado a la información, la tecnología comunicativa necesaria para apoyar los trabajos de promoción de la salud.

  5. Temporal plus epilepsy is a major determinant of temporal lobe surgery failures.

    Science.gov (United States)

    Barba, Carmen; Rheims, Sylvain; Minotti, Lorella; Guénot, Marc; Hoffmann, Dominique; Chabardès, Stephan; Isnard, Jean; Kahane, Philippe; Ryvlin, Philippe

    2016-02-01

    Reasons for failed temporal lobe epilepsy surgery remain unclear. Temporal plus epilepsy, characterized by a primary temporal lobe epileptogenic zone extending to neighboured regions, might account for a yet unknown proportion of these failures. In this study all patients from two epilepsy surgery programmes who fulfilled the following criteria were included: (i) operated from an anterior temporal lobectomy or disconnection between January 1990 and December 2001; (ii) magnetic resonance imaging normal or showing signs of hippocampal sclerosis; and (iii) postoperative follow-up ≥ 24 months for seizure-free patients. Patients were classified as suffering from unilateral temporal lobe epilepsy, bitemporal epilepsy or temporal plus epilepsy based on available presurgical data. Kaplan-Meier survival analysis was used to calculate the probability of seizure freedom over time. Predictors of seizure recurrence were investigated using Cox proportional hazards model. Of 168 patients included, 108 (63.7%) underwent stereoelectroencephalography, 131 (78%) had hippocampal sclerosis, 149 suffered from unilateral temporal lobe epilepsy (88.7%), one from bitemporal epilepsy (0.6%) and 18 (10.7%) from temporal plus epilepsy. The probability of Engel class I outcome at 10 years of follow-up was 67.3% (95% CI: 63.4-71.2) for the entire cohort, 74.5% (95% CI: 70.6-78.4) for unilateral temporal lobe epilepsy, and 14.8% (95% CI: 5.9-23.7) for temporal plus epilepsy. Multivariate analyses demonstrated four predictors of seizure relapse: temporal plus epilepsy (P temporal lobe surgery failure was 5.06 (95% CI: 2.36-10.382) greater in patients with temporal plus epilepsy than in those with unilateral temporal lobe epilepsy. Temporal plus epilepsy represents a hitherto unrecognized prominent cause of temporal lobe surgery failures. In patients with temporal plus epilepsy, anterior temporal lobectomy appears very unlikely to control seizures and should not be advised. Whether larger

  6. Efeitos da perda auditiva, escolaridade e idade no processamento temporal de idosos

    Directory of Open Access Journals (Sweden)

    Isabela Mizani da Silva Lima

    2016-02-01

    Full Text Available RESUMO Objetivo: avaliar o efeito da perda auditiva, escolaridade e idade no processamento temporal de idosos. Métodos: foram avaliados 30 idosos, 15 com perda auditiva e baixa escolaridade e (Grupo 1 e 15 com audição normal e maior escolaridade (Grupo 2. Os participantes foram submetidos a avaliação audiológica, triagem cognitiva e avaliação do processamento temporal (resolução e ordenação temporal. Resultados: nota-se que os além da escolaridade os grupos se diferem em relação a idade, os idosos do Grupo 1 são mais velhos (p=0,024 e menos escolarizados (p=0.002. Os idosos do Grupo 1 apresentaram maior limiar e menor porcentagem de reconhecimento de gaps no ruido quando comparados ao desempenho dos idosos do Grupo 2 (GIN Limiar p=0,002; GIN % p=0,005. Os participantes de ambos os grupos apresentaram desempenhos similares na habilidade de ordenação temporal (p=0,691. Nesta amostra houve correlação negativa entre escolaridade e limiar de acuidade temporal (p=0,045, ou seja, quanto maior a escolaridade (em anos menor o limiar de reconhecimento de gaps. Apesar dos grupos serem distintos em relação a faixa etaria, a idade dos idosos não afetou o desempenho para os testes comportamentais do processamento temporal. Conclusão: Idosos com perda de audição e menor escolaridade apresentam maior prejuizo na habilidade de resolução temporal. Não houve correlação da idade com desempenho nos testes temporais.

  7. Para-equilibrium phase diagrams

    International Nuclear Information System (INIS)

    Pelton, Arthur D.; Koukkari, Pertti; Pajarre, Risto; Eriksson, Gunnar

    2014-01-01

    Highlights: • A rapidly cooled system may attain a state of para-equilibrium. • In this state rapidly diffusing elements reach equilibrium but others are immobile. • Application of the Phase Rule to para-equilibrium phase diagrams is discussed. • A general algorithm to calculate para-equilibrium phase diagrams is described. - Abstract: If an initially homogeneous system at high temperature is rapidly cooled, a temporary para-equilibrium state may result in which rapidly diffusing elements have reached equilibrium but more slowly diffusing elements have remained essentially immobile. The best known example occurs when homogeneous austenite is quenched. A para-equilibrium phase assemblage may be calculated thermodynamically by Gibbs free energy minimization under the constraint that the ratios of the slowly diffusing elements are the same in all phases. Several examples of calculated para-equilibrium phase diagram sections are presented and the application of the Phase Rule is discussed. Although the rules governing the geometry of these diagrams may appear at first to be somewhat different from those for full equilibrium phase diagrams, it is shown that in fact they obey exactly the same rules with the following provision. Since the molar ratios of non-diffusing elements are the same in all phases at para-equilibrium, these ratios act, as far as the geometry of the diagram is concerned, like “potential” variables (such as T, pressure or chemical potentials) rather than like “normal” composition variables which need not be the same in all phases. A general algorithm to calculate para-equilibrium phase diagrams is presented. In the limit, if a para-equilibrium calculation is performed under the constraint that no elements diffuse, then the resultant phase diagram shows the single phase with the minimum Gibbs free energy at any point on the diagram; such calculations are of interest in physical vapor deposition when deposition is so rapid that phase

  8. Marcadores para la Realidad Aumentada para fines educativos

    Directory of Open Access Journals (Sweden)

    María Reina Zarate Nava

    2013-12-01

    Full Text Available La Realidad Aumentada (AR es considerada por algunos expertos como la tecnología en crecimiento para el 2014, en diferentes sectores: ingeniería, educación, juegos y negocios, siendo este último el más usado en él 2013. Sin embargo en el sector educativo la AR se presenta en algunos proyectos que se han desarrollado para diferentes áreas de las ciencias, como Química, Física y Matemáticas, lo anterior con el objetivo de facilitar el proceso de Enseñanza-Aprendizaje. En el presente artículo se presenta el modelo de patrones utilizado para un Proyecto AR enfocado en Química, el cual presenta un conjunto de patrones que fueron valorados para facilitar el rastreo de los objetos y a su vez el entendimiento de algunos materiales de los laboratorios de Química I.

  9. Algoritmos para problemas de empacotamento

    OpenAIRE

    Eduardo Candido Xavier

    2006-01-01

    Resumo: Neste trabalho estudamos diversos problemas de empacotamento considerados NP-difíceis. Assumindo a hipótese de que P ? NP, sabemos que não existem algoritmos eficientes (complexidade de tempo polinomial) exatos para resolver tais problemas. Uma das abordagens consideradas para tratar tais problemas é a de algoritmos de aproximação, que são algoritmos eficientes e que geram soluções com garantia de qualidade. Neste trabalho apresentamos alguns algoritmos aproximados para problemas de e...

  10. The Voronoi spatio-temporal data structure

    Science.gov (United States)

    Mioc, Darka

    2002-04-01

    Current GIS models cannot integrate the temporal dimension of spatial data easily. Indeed, current GISs do not support incremental (local) addition and deletion of spatial objects, and they can not support the temporal evolution of spatial data. Spatio-temporal facilities would be very useful in many GIS applications: harvesting and forest planning, cadastre, urban and regional planning, and emergency planning. The spatio-temporal model that can overcome these problems is based on a topological model---the Voronoi data structure. Voronoi diagrams are irregular tessellations of space, that adapt to spatial objects and therefore they are a synthesis of raster and vector spatial data models. The main advantage of the Voronoi data structure is its local and sequential map updates, which allows us to automatically record each event and performed map updates within the system. These map updates are executed through map construction commands that are composed of atomic actions (geometric algorithms for addition, deletion, and motion of spatial objects) on the dynamic Voronoi data structure. The formalization of map commands led to the development of a spatial language comprising a set of atomic operations or constructs on spatial primitives (points and lines), powerful enough to define the complex operations. This resulted in a new formal model for spatio-temporal change representation, where each update is uniquely characterized by the numbers of newly created and inactivated Voronoi regions. This is used for the extension of the model towards the hierarchical Voronoi data structure. In this model, spatio-temporal changes induced by map updates are preserved in a hierarchical data structure that combines events and corresponding changes in topology. This hierarchical Voronoi data structure has an implicit time ordering of events visible through changes in topology, and it is equivalent to an event structure that can support temporal data without precise temporal

  11. Recognising and Interpreting Named Temporal Expressions

    DEFF Research Database (Denmark)

    Brucato, Matteo; Derczynski, Leon; Llorens, Hectjor

    2013-01-01

    This paper introduces a new class of temporal expression – named temporal expressions – and methods for recognising and interpreting its members. The commonest temporal expressions typically contain date and time words, like April or hours. Research into recognising and interpreting these typical...... expressions is mature in many languages. However, there is a class of expressions that are less typical, very varied, and difficult to automatically interpret. These indicate dates and times, but are harder to detect because they often do not contain time words and are not used frequently enough to appear...

  12. Optimizing Temporal Queries: Efficient Handling of Duplicates

    DEFF Research Database (Denmark)

    Toman, David; Bowman, Ivan Thomas

    2001-01-01

    , these query languages are implemented by translating temporal queries into standard relational queries. However, the compiled queries are often quite cumbersome and expensive to execute even using state-of-the- art relational products. This paper presents an optimization technique that produces more efficient...... translated SQL queries by taking into account the properties of the encoding used for temporal attributes. For concreteness, this translation technique is presented in the context of SQL/TP; however, these techniques are also applicable to other temporal query languages....

  13. El Malestar en el Empleo Temporal Involuntario

    OpenAIRE

    Blanch, Josep M.; Cantera, Leonor M.

    2009-01-01

    El objetivo de este estudio fue analizar el papel de la voluntariedad de la situación ocupacional en el malestar psicológico en el empleo temporal. Se aplicó un cuestionario a una muestra de 463 personas incluidas en alguno de los siguientes cuatro tipos ideales de situación ocupacional: empleo estable, empleo temporal voluntario, empleo temporal involuntario y desempleo. Los resultados muestran diferencias significativas entre todos los tipos laborales en la escala de bienestar laboral. De m...

  14. El malestar en el Empleo Temporal Involuntario

    OpenAIRE

    Blanch i Ribas, Josep Maria

    2009-01-01

    El objetivo de este estudio fue analizar el papel de la voluntariedad de la situación ocupacional en el malestar psicológico en el empleo temporal. Se aplicó un cuestionario a una muestra de 463 personas incluidas en alguno de los siguientes cuatro tipos ideales de situación ocupacional: empleo estable, empleo temporal voluntario, empleo temporal involuntario y desempleo. Los resultados muestran diferencias significativas entre todos los tipos laborales en la escala de bienestar laboral. De m...

  15. Temporal processes involved in simultaneous reflection masking

    DEFF Research Database (Denmark)

    Buchholz, Jörg

    2006-01-01

    reflection delays and enhances the test reflection for large delays. Employing a 200-ms-long broadband noise burst as input signal, the critical delay separating these two binaural phenomena was found to be 7–10 ms. It was suggested that the critical delay refers to a temporal window that is employed......, resulting in a critical delay of about 2–3 ms for 20-ms-long stimuli. Hence, for very short stimuli the temporal window or critical delay exhibits values similar to the auditory temporal resolution as, for instance, observed in gap-detection tasks. It is suggested that the larger critical delay observed...

  16. Temporal feature integration for music genre classification

    DEFF Research Database (Denmark)

    Meng, Anders; Ahrendt, Peter; Larsen, Jan

    2007-01-01

    , but they capture neither the temporal dynamics nor dependencies among the individual feature dimensions. Here, a multivariate autoregressive feature model is proposed to solve this problem for music genre classification. This model gives two different feature sets, the diagonal autoregressive (DAR......) and multivariate autoregressive (MAR) features which are compared against the baseline mean-variance as well as two other temporal feature integration techniques. Reproducibility in performance ranking of temporal feature integration methods were demonstrated using two data sets with five and eleven music genres...

  17. The temporal-relevance temporal-uncertainty model of prospective duration judgment.

    Science.gov (United States)

    Zakay, Dan

    2015-12-15

    A model aimed at explaining prospective duration judgments in real life settings (as well as in the laboratory) is presented. The model is based on the assumption that situational meaning is continuously being extracted by humans' perceptual and cognitive information processing systems. Time is one of the important dimensions of situational meaning. Based on the situational meaning, a value for Temporal Relevance is set. Temporal Relevance reflects the importance of temporal aspects for enabling adaptive behavior in a specific moment in time. When Temporal Relevance is above a certain threshold a prospective duration judgment process is evoked automatically. In addition, a search for relevant temporal information is taking place and its outcomes determine the level of Temporal Uncertainty which reflects the degree of knowledge one has regarding temporal aspects of the task to be performed. The levels of Temporal Relevance and Temporal Uncertainty determine the amount of attentional resources allocated for timing by the executive system. The merit of the model is in connecting timing processes with the ongoing general information processing stream. The model rests on findings in various domains which indicate that cognitive-relevance and self-relevance are powerful determinants of resource allocation policy. The feasibility of the model is demonstrated by analyzing various temporal phenomena. Suggestions for further empirical validation of the model are presented. Copyright © 2015 Elsevier Inc. All rights reserved.

  18. Análise estatística de chuvas intensas na bacia hidrográfica do Rio Paraíba Statistical analysis of rains intense in the Paraíba River bas

    Directory of Open Access Journals (Sweden)

    Lincoln Eloi de Araújo

    2008-06-01

    Full Text Available Esta pesquisa foi realizada na bacia hidrográfica do rio Paraíba com a finalidade de identificar a variação espacial e temporal das chuvas intensas de 1, 2, 3, 4 e 5 dias. Os resultados obtidos mostraram concentração de valores máximos da variação espacial das chuvas intensas no leste da sub-bacia do Baixo Paraíba, Sul da sub-bacia do rio Taperoá e centro-norte da sub-bacia do Alto Paraíba. A análise da variação temporal revelou que os meses de maiores ocorrências de chuvas intensas na bacia em estudo são: janeiro, fevereiro, março e abril. Em seguida, as chuvas intensas foram ajustadas à função distribuição de probabilidade de Gumbel. O teste Kolmogorov-Smirnov foi utilizado para verificar a qualidade desses ajustes.This research was accomplished in the Paraíba river basin for to identify the space and temporal variability of the rains intense of 1, 2, 3, 4 and 5 days. The obtained results showed concentration of maximum values of the space variation of the rains intense in the east of the subbasin of Low Paraíba, south of the subbasin of the river Taperoá and center-north of the subbasin of High Paraíba. The analysis of the temporal variation did reveal that the months of larger occurrences of rains intense in the basin in study are: January, February, March and April. Soon after, the rains intense they were adjusted to the probability distribution function of Gumbel. The test Kolmogorov-Smirnov was used to verify the quality of those fittings.

  19. UTP and Temporal Logic Model Checking

    Science.gov (United States)

    Anderson, Hugh; Ciobanu, Gabriel; Freitas, Leo

    In this paper we give an additional perspective to the formal verification of programs through temporal logic model checking, which uses Hoare and He Unifying Theories of Programming (UTP). Our perspective emphasizes the use of UTP designs, an alphabetised relational calculus expressed as a pre/post condition pair of relations, to verify state or temporal assertions about programs. The temporal model checking relation is derived from a satisfaction relation between the model and its properties. The contribution of this paper is that it shows a UTP perspective to temporal logic model checking. The approach includes the notion of efficiency found in traditional model checkers, which reduced a state explosion problem through the use of efficient data structures

  20. Querying temporal databases via OWL 2 QL

    CSIR Research Space (South Africa)

    Klarman, S

    2014-06-01

    Full Text Available SQL:2011, the most recently adopted version of the SQL query language, has unprecedentedly standardized the representation of temporal data in relational databases. Following the successful paradigm of ontology-based data access, we develop a...

  1. Temporal Attributes: their Status and Subsumption

    CSIR Research Space (South Africa)

    Keet, CM

    2015-01-01

    Full Text Available Representing data that changes over time in conceptual data models is required by various application domains, and requires a language that is expressive enough to fully capture the operational semantics of the time-varying information. Temporal...

  2. Cerebrospinal otorrhoea--a temporal bone report.

    Science.gov (United States)

    Walby, A P

    1988-05-01

    Spontaneous cerebrospinal otorrhoea is a rare complication of a cholesteatoma. The histological findings in a temporal bone from such a case are reported. The cholesteatoma had eroded deeply through the vestibule into the internal auditory meatus.

  3. Evaluating Temporal Consistency in Marine Biodiversity Hotspots

    OpenAIRE

    Piacenza, Susan E.; Thurman, Lindsey L.; Barner, Allison K.; Benkwitt, Cassandra E.; Boersma, Kate S.; Cerny-Chipman, Elizabeth B.; Ingeman, Kurt E.; Kindinger, Tye L.; Lindsley, Amy J.; Nelson, Jake; Reimer, Jessica N.; Rowe, Jennifer C.; Shen, Chenchen; Thompson, Kevin A.; Heppell, Selina S.

    2015-01-01

    With the ongoing crisis of biodiversity loss and limited resources for conservation, the concept of biodiversity hotspots has been useful in determining conservation priority areas. However, there has been limited research into how temporal variability in biodiversity may influence conservation area prioritization. To address this information gap, we present an approach to evaluate the temporal consistency of biodiversity hotspots in large marine ecosystems. Using a large scale, public monito...

  4. Sleep enforces the temporal order in memory.

    Directory of Open Access Journals (Sweden)

    Spyridon Drosopoulos

    Full Text Available BACKGROUND: Temporal sequence represents the main principle underlying episodic memory. The storage of temporal sequence information is thought to involve hippocampus-dependent memory systems, preserving temporal structure possibly via chaining of sequence elements in heteroassociative networks. Converging evidence indicates that sleep enhances the consolidation of recently acquired representations in the hippocampus-dependent declarative memory system. Yet, it is unknown if this consolidation process comprises strengthening of the temporal sequence structure of the representation as well, or is restricted to sequence elements independent of their temporal order. To address this issue we tested the influence of sleep on the strength of forward and backward associations in word-triplets. METHODOLOGY/PRINCIPAL FINDINGS: Subjects learned a list of 32 triplets of unrelated words, presented successively (A-B-C in the center of a screen, and either slept normally or stayed awake in the subsequent night. After two days, retrieval was assessed for the triplets sequentially either in a forward direction (cueing with A and B and asking for B and C, respectively or in a backward direction (cueing with C and B and asking for B and A, respectively. Memory was better for forward than backward associations (p<0.01. Sleep did not affect backward associations, but enhanced forward associations, specifically for the first (AB transitions (p<0.01, which were generally more difficult to retrieve than the second transitions. CONCLUSIONS/SIGNIFICANCE: Our data demonstrate that consolidation during sleep strengthens the original temporal sequence structure in memory, presumably as a result of a replay of new representations during sleep in forward direction. Our finding suggests that the temporally directed replay of memory during sleep, apart from strengthening those traces, could be the key mechanism that explains how temporal order is integrated and maintained in

  5. MRI findings of temporal lobe ganglioglioma

    International Nuclear Information System (INIS)

    Lee, Myung Jun; Lee, Ho Kyu; Lee, Jung Kyo; Choi, Choong Gon; Suh, Dae Chul

    1999-01-01

    Ganglioglioma is a rare primary brain tumor usually found in the temporal lobe. The purpose of this study is to describe the characteristic MR findings of temporal lobe ganglioglioma. Over a seven-year period, ten patients with cerebral ganglioglioma were evaluated at our institution. Seven cases of temporal lobe ganglioma were found ; six of these involved men, and one, a woman ; their mean age was 29.6 years. In three patients, Gd-DTPA-enhanced T1-weighted images were also obtained. We retrospectively analysed the MRI findings with respect to location, size, cortical involvement, margin, cystic change, degree of enhancement, MR signal intensity, calcification and peritumoral change. In five cases, tumors were located within the temporal lobe. In one, a tumor extended from the temporal lobe to the thalamus, and in one from the temporal lobe to the thalamus and cerebral peduncle. All temporal gangliogliomas measured 1.6-3.8cm in their greatest diameter (mean diameter, 2.7cm). In all cases, the cortices were involved with the maintenance of gyriform. The tumor margin was ill defined in five cases and well defined in two. Tumors showed multiple small cystic changes in four cases, a large cyst in two, and a solid nodule in one. In three cases in which contrast media was administered, no lesions were enhanced. On T1-weighted images, iso-signal intensities were seen in five cases and high signal intensities in two. On T2-weighted images, the corresponding figures were five and two. On MRI, tumor calcification and calvarial erosion were each detected in two cases. In patients with temporal lobe epilepsy in whom cortical solid or cystic and poorly enhanced lesions were seen on brain MRI, and in whom associated findings such as calcification and or adjacent bony erosion were noted, ganglioglioma must be considered

  6. Mind the gap: temporal discrimination and dystonia.

    Science.gov (United States)

    Sadnicka, A; Daum, C; Cordivari, C; Bhatia, K P; Rothwell, J C; Manohar, S; Edwards, M J

    2017-06-01

    One of the most widely studied perceptual measures of sensory dysfunction in dystonia is the temporal discrimination threshold (TDT) (the shortest interval at which subjects can perceive that there are two stimuli rather than one). However the elevated thresholds described may be due to a number of potential mechanisms as current paradigms test not only temporal discrimination but also extraneous sensory and decision-making parameters. In this study two paradigms designed to better quantify temporal processing are presented and a decision-making model is used to assess the influence of decision strategy. 22 patients with cervical dystonia and 22 age-matched controls completed two tasks (i) temporal resolution (a randomized, automated version of existing TDT paradigms) and (ii) interval discrimination (rating the length of two consecutive intervals). In the temporal resolution task patients had delayed (P = 0.021) and more variable (P = 0.013) response times but equivalent discrimination thresholds. Modelling these effects suggested this was due to an increased perceptual decision boundary in dystonia with patients requiring greater evidence before committing to decisions (P = 0.020). Patient performance on the interval discrimination task was normal. Our work suggests that previously observed abnormalities in TDT may not be due to a selective sensory deficit of temporal processing as decision-making itself is abnormal in cervical dystonia. © 2017 EAN.

  7. Temporal Processing in Audition: Insights from Music.

    Science.gov (United States)

    Rajendran, Vani G; Teki, Sundeep; Schnupp, Jan W H

    2017-11-03

    Music is a curious example of a temporally patterned acoustic stimulus, and a compelling pan-cultural phenomenon. This review strives to bring some insights from decades of music psychology and sensorimotor synchronization (SMS) literature into the mainstream auditory domain, arguing that musical rhythm perception is shaped in important ways by temporal processing mechanisms in the brain. The feature that unites these disparate disciplines is an appreciation of the central importance of timing, sequencing, and anticipation. Perception of musical rhythms relies on an ability to form temporal predictions, a general feature of temporal processing that is equally relevant to auditory scene analysis, pattern detection, and speech perception. By bringing together findings from the music and auditory literature, we hope to inspire researchers to look beyond the conventions of their respective fields and consider the cross-disciplinary implications of studying auditory temporal sequence processing. We begin by highlighting music as an interesting sound stimulus that may provide clues to how temporal patterning in sound drives perception. Next, we review the SMS literature and discuss possible neural substrates for the perception of, and synchronization to, musical beat. We then move away from music to explore the perceptual effects of rhythmic timing in pattern detection, auditory scene analysis, and speech perception. Finally, we review the neurophysiology of general timing processes that may underlie aspects of the perception of rhythmic patterns. We conclude with a brief summary and outlook for future research. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  8. Sampling of temporal networks: Methods and biases

    Science.gov (United States)

    Rocha, Luis E. C.; Masuda, Naoki; Holme, Petter

    2017-11-01

    Temporal networks have been increasingly used to model a diversity of systems that evolve in time; for example, human contact structures over which dynamic processes such as epidemics take place. A fundamental aspect of real-life networks is that they are sampled within temporal and spatial frames. Furthermore, one might wish to subsample networks to reduce their size for better visualization or to perform computationally intensive simulations. The sampling method may affect the network structure and thus caution is necessary to generalize results based on samples. In this paper, we study four sampling strategies applied to a variety of real-life temporal networks. We quantify the biases generated by each sampling strategy on a number of relevant statistics such as link activity, temporal paths and epidemic spread. We find that some biases are common in a variety of networks and statistics, but one strategy, uniform sampling of nodes, shows improved performance in most scenarios. Given the particularities of temporal network data and the variety of network structures, we recommend that the choice of sampling methods be problem oriented to minimize the potential biases for the specific research questions on hand. Our results help researchers to better design network data collection protocols and to understand the limitations of sampled temporal network data.

  9. La prevención de riesgos laborales en las empresas de trabajo temporal: obligaciones y responsabilidades

    OpenAIRE

    Jiménez Navas, Patricia

    2013-01-01

    El propósito de este trabajo fin de máster es analizar la prevención de riesgos laborales en las empresas de trabajo temporal (en adelante ETT), ya que es un sector muy importante de empleo en nuestro país, y tiene un papel fundamental en estos momentos de crisis en los que las empresas no pueden contratar personal pero sí necesitan trabajadores para momentos específicos. Además, cada vez son más las empresas que externalizan muchas de sus actividades para que las realice personal contratado ...

  10. Micropropagación masiva de Stevia rebaudiana Bertoni en sistemas de inmersión temporal

    OpenAIRE

    Alvarenga Venutolo, Silvana

    2015-01-01

    Stevia rebaudiana Bertoni, familia Asteraceae, es conocida como “yerba dulce” por poseer un edulcorante natural. Sus propiedades provienen de la presencia de glicósidos diterpenos denominados esteviósidos y rebaudiósidos en las hojas. El porcentaje de germinación de las semillas de S. rebaudiana es muy bajo y las plantas producidas son heterogéneas, por lo que no es conveniente para la propagación masiva en campo. El cultivo en sistemas de inmersión temporal, es una herramienta eficaz para la...

  11. Imaging of limbic para-neoplastic encephalitis; Imagerie de l`encephalite limbique paraneoplastique

    Energy Technology Data Exchange (ETDEWEB)

    Rimmelin, A.; Sellat, F.; Morand, G.; Quoix, E.; Clouet, P.L.; Dietemann, J.L. [Centre Hospitalier Universitaire, 67 - Strasbourg (France)

    1997-09-01

    Para-neoplastic limbic encephalitis is a rare syndrome mostly associated with small cell lung cancer. We present the case of a 69-year-old man with selective amnesia suggesting limbic encephalitis. A neuroendocrine cell lung cancer was found, confirming the diagnostics of para-neoplastic limbic encephalitis. Contrast-enhanced cerebral CT was normal whether magnetic resonance imaging showed signal abnormalities of the medial part of temporal lobes and hippocampal regions. Because neurologic improvement may follow treatment of the primary tumor, early diagnosis is important. (authors). 10 refs.

  12. O perfil motivacional do docente da rede estadual de ensino fundamental na paraíba

    OpenAIRE

    Viana, Júlio Cezar da Câmara Ribeiro

    2008-01-01

    Tendo por objetivo conhecer os fatores motivacionais presentes no comportamento dos professores, enquanto população alvo da pesquisa, especificamente na rede de ensino fundamental pública do Estado da Paraíba, esse estudo abrangeu uma população composta por 874 profissionais, sendo 350 do quadro de pessoal temporário e 524 do quadro efetivo. Na perspectiva desse estudo, essa população representa um universo complexo para tratar a temática motivação, haja vista a dimensão de var...

  13. Herramienta web para calcular el impacto radiologico asociado al transporte de residuos radiactivos al ATC

    OpenAIRE

    Calleja Rubio, Jose Antonio; Gutierrez Martin, Fernando; Colón Hernández, Cristobal

    2012-01-01

    Técnicos de TECNATOM, S.A. e Investigadores de la (UPM), han desarrollado un programa para analizar la logística y los impactos potenciales del transporte por carretera de materiales radiactivos en España. El transporte de materiales radiactivos es un tema de renovado interés en nuestro país debido a la creciente movilidad que cabe esperar, sobre todo tras la entrada en operación del almacén temporal centralizado (ATC) previsto para los próximos años. Este almacén está destinado a resi...

  14. Subsídios para o monitoramento de formigas cortadeiras em plantios florestais no Planalto Catarinense

    OpenAIRE

    Hoffer, Hadson

    2015-01-01

    O objetivo deste trabalho foi fornecer subsídios para o monitoramento de formigas cortadeiras em plantios florestais no Planalto Catarinense, conhecendo as espécies de formigas cortadeiras da região, sua associação com o tipo de solo e a distribuição espaço-temporal dos danos causados em Pinus taeda. Para isso foram percorridos plantios florestais em sete municípios do Planalto Catarinense na busca por ninhos de formigas cortadeiras. As coletas ocorreram em cinco diferentes tipos de solo com ...

  15. Temporal lobe sclerosis associated with hippocampal sclerosis in temporal lobe epilepsy: neuropathological features.

    Science.gov (United States)

    Thom, Maria; Eriksson, Sofia; Martinian, Lillian; Caboclo, Luis O; McEvoy, Andrew W; Duncan, John S; Sisodiya, Sanjay M

    2009-08-01

    Widespread changes involving neocortical and mesial temporal lobe structures can be present in patients with temporal lobe epilepsy and hippocampal sclerosis. The incidence, pathology, and clinical significance of neocortical temporal lobe sclerosis (TLS) are not well characterized. We identified TLS in 30 of 272 surgically treated cases of hippocampal sclerosis. Temporal lobe sclerosis was defined by variable reduction of neurons from cortical layers II/III and laminar gliosis; it was typically accompanied by additional architectural abnormalities of layer II, that is, abnormal neuronal orientation and aggregation. Quantitative analysis including tessellation methods for the distribution of layer II neurons supported these observations. In 40% of cases, there was a gradient of TLS with more severe involvement toward the temporal pole, possibly signifying involvement of hippocampal projection pathways. There was a history of a febrile seizure as an initial precipitating injury in 73% of patients with TLS compared with 36% without TLS; no other clinical differences between TLS and non-TLS cases were identified. Temporal lobe sclerosis was not evident preoperatively by neuroimaging. No obvious effect of TLS on seizure outcome was noted after temporal lobe resection; 73% became seizure-free at 2-year follow-up. In conclusion, approximately 11% of surgically treated hippocampal sclerosis is accompanied by TLS. Temporal lobe sclerosis is likely an acquired process with accompanying reorganizational dysplasia and an extension of mesial temporal sclerosis rather than a separate pathological entity.

  16. Full-fledged temporal processing: bridging the gap between deep linguistic processing and temporal extraction

    Directory of Open Access Journals (Sweden)

    Francisco Costa

    2013-07-01

    Full Text Available The full-fledged processing of temporal information presents specific challenges. These difficulties largely stem from the fact that the temporal meaning conveyed by grammatical means interacts with many extra-linguistic factors (world knowledge, causality, calendar systems, reasoning. This article proposes a novel approach to this problem, based on a hybrid strategy that explores the complementarity of the symbolic and probabilistic methods. A specialized temporal extraction system is combined with a deep linguistic processing grammar. The temporal extraction system extracts eventualities, times and dates mentioned in text, and also temporal relations between them, in line with the tasks of the recent TempEval challenges; and uses machine learning techniques to draw from different sources of information (grammatical and extra-grammatical even if it is not explicitly known how these combine to produce the final temporal meaning being expressed. In turn, the deep computational grammar delivers richer truth-conditional meaning representations of input sentences, which include a principled representation of temporal information, on which higher level tasks, including reasoning, can be based. These deep semantic representations are extended and improved according to the output of the aforementioned temporal extraction module. The prototype implemented shows performance results that increase the quality of the temporal meaning representations and are better than the performance of each of the two components in isolation.

  17. Uma ferramenta para planejamento de estudos para concursos

    Directory of Open Access Journals (Sweden)

    Leonardo Pimentel

    2015-11-01

    Full Text Available De acordo com a constituição brasileira, a única forma de se tornar um empregado do governo é passar em um concurso público. O exame de conhecimento do cargo é um dos componentes mais importantes de um concurso. Estudar para esse exame é uma tarefa que requer planejamento. Um meio de obter um bom planejamento é construir uma grade de horários que relacione as matérias a serem estudadas com os respectivos horários disponíveis para o estudo. Esse tipo de problema se assemelha bastante à gerência de projetos, em que se procura estabelecer a distribuição das atividades ao longo do tempo disponível. Assim, torna-se interessante explorar a dinâmica de estudos para concursos como um projeto. O presente trabalho apresenta a ferramenta de apoio ao estudos - Passe-me, baseada no ciclo PDCA (do inglês, Plan-Do-Check-Act. Por se tratar de uma ferramenta web, o tempo de resposta para produzir uma grade de estudos é fundamental. A ferramenta faz uso de algoritmo genético para calcular a grade de horários priorizando a velocidade de resposta. A ferramenta foi avaliada em diferentes cenários de uso e obteve desempenho satisfatório durante a produção da grade de estudos.

  18. Extraction of temporal information in functional MRI

    Science.gov (United States)

    Singh, M.; Sungkarat, W.; Jeong, Jeong-Won; Zhou, Yongxia

    2002-10-01

    The temporal resolution of functional MRI (fMRI) is limited by the shape of the haemodynamic response function (hrf) and the vascular architecture underlying the activated regions. Typically, the temporal resolution of fMRI is on the order of 1 s. We have developed a new data processing approach to extract temporal information on a pixel-by-pixel basis at the level of 100 ms from fMRI data. Instead of correlating or fitting the time-course of each pixel to a single reference function, which is the common practice in fMRI, we correlate each pixel's time-course to a series of reference functions that are shifted with respect to each other by 100 ms. The reference function yielding the highest correlation coefficient for a pixel is then used as a time marker for that pixel. A Monte Carlo simulation and experimental study of this approach were performed to estimate the temporal resolution as a function of signal-to-noise ratio (SNR) in the time-course of a pixel. Assuming a known and stationary hrf, the simulation and experimental studies suggest a lower limit in the temporal resolution of approximately 100 ms at an SNR of 3. The multireference function approach was also applied to extract timing information from an event-related motor movement study where the subjects flexed a finger on cue. The event was repeated 19 times with the event's presentation staggered to yield an approximately 100-ms temporal sampling of the haemodynamic response over the entire presentation cycle. The timing differences among different regions of the brain activated by the motor task were clearly visualized and quantified by this method. The results suggest that it is possible to achieve a temporal resolution of /spl sim/200 ms in practice with this approach.

  19. Analyzing temporal variation in the lethality of ETA

    Directory of Open Access Journals (Sweden)

    Sánchez-Cuenca, Ignacio

    2009-12-01

    Full Text Available This article analyzes time variation in the lethal violence of the terrorist organization ETA. Given the dynamic structure of the time series of fatalities, I look at the effect of a number of independent variables (the celebration of different types of elections, anti-ETA activity by extreme right-wing organizations and the GAL, police arrests, and other relevant events, such as the referendums on the Constitution and the Statute of Autonomy of Guernica. To do so, I have estimated several ARIMA models using the time series of fatalities between 1968 and 2007. Moreover, the results obtained are complemented by a historical-political analysis of the period of maximum violence, which took place during the Spanish transition to democracy.

    Este artículo analiza la variación temporal en la violencia letal de la organización terrorista ETA. Dada la estructura dinámica de la serie temporal de víctimas mortales, se estudia el efecto de una serie de variables independientes (celebración de distintos tipos de elecciones, actividad anti-ETA de la extrema derecha y del GAL, detenciones policiales y sucesos especiales como los referendos sobre la Constitución o el Estatuto de Autonomía de Guernica. Para ello, se estiman diversos modelos ARIMA con la serie trimestral de víctimas mortales entre 1968 y 2007. Además, se completan los resultados obtenidos con un análisis histórico-político del periodo de máxima violencia durante la transición a la democracia.

  20. ¿Argumentar para definir o definir para argumentar?

    OpenAIRE

    Silva, Luz; Samper, Carmen

    2013-01-01

    Se presenta y se ilustra un marco de referencia de un estudio en curso para obtener el título de Maestría en Docencia de la Matemática de la Universidad Pedagógica Nacional (Colombia); estudio sobre la conexión entre las acciones de definir y argumentar, que puede contribuir a la práctica de profesores en ejercicio y en formación. La habilidad para construir una definición es un posible indicio de comprensión, mientras que saberla de memoria no garantiza la comprensión del concepto (Vinner, 1...

  1. Temporal and extra-temporal hypoperfusion in medial temporal lobe epilepsy evaluated by arterial-spin-labeling based MRI

    International Nuclear Information System (INIS)

    Shen Lianfang; Zhang Zhiqiang; Lu Guangming; Yuan Cuiping; Wang Zhengge; Wang Haoxue; Huang Wei; Wei Fangyuan; Chen Guanghui; Tan Qifu

    2012-01-01

    Objective: To evaluate the feasibility of the lateralization of unilateral medial temporal lobe epilepsy (mTLE) by using arterial-spin-labeling (ASL) based perfusion MR imaging and investigate the changes of perfusion in the regions related to mTLE network and the relationship between the perfusion and the clinical status. Methods: Twenty-five patients with left-sided and 23 with right-sided mTLE were enrolled, and 30 healthy volunteers were recruited. The cerebral blood flow (CBF) of related region was measured based on pulsed-ASL sequence on Siemens 3 T scanner. The CBF of the mTLE group were compared with that in the controls by using ANOVA analysis. The asymmetric indices of CBF in the medial temporal lobe were calculated as the lesion side compared with the normal side in matched region in mTLE group. Results: Compared with the volunteers, the patients with mTLE showed the decrease of CBF in the bilateral medial and lateral temporal, the frontal and parietal regions relating to the default-mode network and more serious in lesion side. The CBF values of the medial temporal lobe were negatively correlated with the epilepsy duration (r=-0.51, P<0.01). The asymmetric index of CBF as-0.01 has a 76.0% (19/25) sensitivity and a 78.3% (18/23) specificity to distinguish the lesion side. Conclusions: The decrease of CBF in the temporal and extra-temporal region by ASL-based MRI suggests the functional abnormalities in the network involved by mTLE. The ASL technique is a useful tool for lateralizing the unilateral mTLE. (authors)

  2. Confiabilidade de medidas volumétricas de estruturas temporais mesiais Reliability of mesial temporal lobe volumetric measures

    Directory of Open Access Journals (Sweden)

    Renato L. Marchetti

    2002-06-01

    Full Text Available MOTIVO DO ESTUDO: O desenvolvimento de técnicas confiáveis para a realização de medidas volumétricas de estruturas temporais mesiais (amígdala, hipocampo e giro para-hipocampal em exames de ressonância magnética (RM pode fornecer dados para o estudo de vários transtornos neuropsiquiátricos, particularmente epilepsia do lobo temporal, doença de Alzheimer e esquizofrenia. MÉTODO: Investigamos essas técnicas realizando estudo de confiabilidade intra-observador (IO e entre-observador (EO, envolvendo controles normais, pacientes com epilepsia e pacientes com doença de Alzheimer, através do coeficiente de correlação intra-classe (CCI. RESULTADOS: A confiabilidade IO para as estruturas analisadas variou de 0,93 a 0,99 (pRATIONALE: The development of reliable techniques for volumetric measurement of mesial temporal structures (amygdala, hypocampus and parahypocampal gyrus on magnetic resonance imaging (MRI can provide data for the study of neuropsychiatric disorders, mainly temporal lobe epilepsy, Alzheimer´s disease and schizophrenia. METHOD: We investigated these techniques performing intraobserver and interobserver reliability study concerning normal controls, epilepsy and Alzheimer's disease patients using the intra-class correlation coefficient. RESULTS: Intra-observer reliability of evaluated structures ranged from 0.93 to 0.99 (p<0.001. Inter-observer reliability ranged from 0.70 to 0.95 (p <= 0.001. CONCLUSION: The results suggest that the technique of MRI morphometry of mesial temporal regions can be considered a reliable tool which may help in the investigation of neuropsychiatric disorders, since used by adequately trained clinicians and researchers.

  3. Grammatical Means of Temporality Expression in Translation

    Directory of Open Access Journals (Sweden)

    Tulegen Asylbekovich Merkibayev

    2016-11-01

    Full Text Available Creation problem of model of grammatical means of temporality expression in translation from English into Kazakh and Russian languages is considered in the article. At a choice of translation of transformations of aspectual-temporal categories of a verb from English into Kazakh and Russian languages it is considered not only grammatical compliance of categories of tense, but also the contextual use of a functional and semantic field of verbs, comparison of lexical temporality with positions of concepts, specific to each language world picture, with positions of modern philosophy and logic of language. Authors come to a conclusion that productive use of analytical forms in the Kazakh and English languages is the result of structural features of categories of tense and a type of English and Kazakh languages. Comparison of a phase of actions of a verb in English and Kazakh languages allows creation of reference model of grammatical means of expression of temporality in translation from English into Kazakh and Russian languages on the basis of a functional and semantic field of verbs, comparison of lexical temporality from positions specific on each language picture of the world.

  4. Temporal Reference, Attentional Modulation, and Crossmodal Assimilation

    Directory of Open Access Journals (Sweden)

    Yingqi Wan

    2018-06-01

    Full Text Available Crossmodal assimilation effect refers to the prominent phenomenon by which ensemble mean extracted from a sequence of task-irrelevant distractor events, such as auditory intervals, assimilates/biases the perception (such as visual interval of the subsequent task-relevant target events in another sensory modality. In current experiments, using visual Ternus display, we examined the roles of temporal reference, materialized as the time information accumulated before the onset of target event, as well as the attentional modulation in crossmodal temporal interaction. Specifically, we examined how the global time interval, the mean auditory inter-intervals and the last interval in the auditory sequence assimilate and bias the subsequent percept of visual Ternus motion (element motion vs. group motion. We demonstrated that both the ensemble (geometric mean and the last interval in the auditory sequence contribute to bias the percept of visual motion. Longer mean (or last interval elicited more reports of group motion, whereas the shorter mean (or last auditory intervals gave rise to more dominant percept of element motion. Importantly, observers have shown dynamic adaptation to the temporal reference of crossmodal assimilation: when the target visual Ternus stimuli were separated by a long gap interval after the preceding sound sequence, the assimilation effect by ensemble mean was reduced. Our findings suggested that crossmodal assimilation relies on a suitable temporal reference on adaptation level, and revealed a general temporal perceptual grouping principle underlying complex audio-visual interactions in everyday dynamic situations.

  5. Purely temporal figure-ground segregation.

    Science.gov (United States)

    Kandil, F I; Fahle, M

    2001-05-01

    Visual figure-ground segregation is achieved by exploiting differences in features such as luminance, colour, motion or presentation time between a figure and its surround. Here we determine the shortest delay times required for figure-ground segregation based on purely temporal features. Previous studies usually employed stimulus onset asynchronies between figure- and ground-containing possible artefacts based on apparent motion cues or on luminance differences. Our stimuli systematically avoid these artefacts by constantly showing 20 x 20 'colons' that flip by 90 degrees around their midpoints at constant time intervals. Colons constituting the background flip in-phase whereas those constituting the target flip with a phase delay. We tested the impact of frequency modulation and phase reduction on target detection. Younger subjects performed well above chance even at temporal delays as short as 13 ms, whilst older subjects required up to three times longer delays in some conditions. Figure-ground segregation can rely on purely temporal delays down to around 10 ms even in the absence of luminance and motion artefacts, indicating a temporal precision of cortical information processing almost an order of magnitude lower than the one required for some models of feature binding in the visual cortex [e.g. Singer, W. (1999), Curr. Opin. Neurobiol., 9, 189-194]. Hence, in our experiment, observers are unable to use temporal stimulus features with the precision required for these models.

  6. Rescaling of temporal expectations during extinction

    Science.gov (United States)

    Drew, Michael R.; Walsh, Carolyn; Balsam, Peter D

    2016-01-01

    Previous research suggests that extinction learning is temporally specific. Changing the CS duration between training and extinction can facilitate the loss of the CR within the extinction session but impairs long-term retention of extinction. In two experiments using conditioned magazine approach with rats, we examined the relation between temporal specificity of extinction and CR timing. In Experiment 1 rats were trained on a 12-s, fixed CS-US interval and then extinguished with CS presentations that were 6, 12, or 24 s in duration. The design of Experiment 2 was the same except rats were trained using partial rather than continuous reinforcement. In both experiments, extending the CS duration in extinction facilitated the diminution of CRs during the extinction session, but shortening the CS duration failed to slow extinction. In addition, extending (but not shortening) the CS duration caused temporal rescaling of the CR, in that the peak CR rate migrated later into the trial over the course of extinction training. This migration partially accounted for the faster loss of the CR when the CS duration was extended. Results are incompatible with the hypothesis that extinction is driven by cumulative CS exposure and suggest that temporally extended nonreinforced CS exposure reduces conditioned responding via temporal displacement rather than through extinction per se. PMID:28045291

  7. Temporal correlation coefficient for directed networks.

    Science.gov (United States)

    Büttner, Kathrin; Salau, Jennifer; Krieter, Joachim

    2016-01-01

    Previous studies dealing with network theory focused mainly on the static aggregation of edges over specific time window lengths. Thus, most of the dynamic information gets lost. To assess the quality of such a static aggregation the temporal correlation coefficient can be calculated. It measures the overall possibility for an edge to persist between two consecutive snapshots. Up to now, this measure is only defined for undirected networks. Therefore, we introduce the adaption of the temporal correlation coefficient to directed networks. This new methodology enables the distinction between ingoing and outgoing edges. Besides a small example network presenting the single calculation steps, we also calculated the proposed measurements for a real pig trade network to emphasize the importance of considering the edge direction. The farm types at the beginning of the pork supply chain showed clearly higher values for the outgoing temporal correlation coefficient compared to the farm types at the end of the pork supply chain. These farm types showed higher values for the ingoing temporal correlation coefficient. The temporal correlation coefficient is a valuable tool to understand the structural dynamics of these systems, as it assesses the consistency of the edge configuration. The adaption of this measure for directed networks may help to preserve meaningful additional information about the investigated network that might get lost if the edge directions are ignored.

  8. Rightward shift in temporal order judgements in the wake of the attentional blink

    Directory of Open Access Journals (Sweden)

    Mitchell Valdés-Sosa

    2008-01-01

    Full Text Available Cambio hacia la derecha en los juicios de orden temporal durante el parpadeo atencional. El orden temporal de dos eventos, cada uno de ellos presentado en un hemicampo visual diferente, puede ser juzgado correctamente por observadores típicos inclusive cuando la diferencia de tiempo entre las presentaciones sea muy pequeña. El presente trabajo analiza la influencia de un proceso endógeno sobre el juicio de orden temporal (JOT y nos muestra que la percepción del orden temporal está también afectada cuando los recursos atencionales disponibles son reducidos mediante un paradigma de parpadeo atencional (PA. A los participantes se les presentaron los siguientes estímulos: un primer estímulo visual (T1 en el centro de fijación y luego de un intervalo de tiempo variable (280 ó 1030 ms, un par de estímulos lateralizados (T2. Para la tarea dual con el intervalo de tiempo de 280 ms entre T1 y T2, la precisión en el JOT se deterioró, evidenciando un PA. Sin embargo, durante el PA en lugar de la asimetría favorable al lado izquierdo, aparece un significativo sesgo en contra de ese lado.

  9. Pathophysiology of mood disorders in temporal lobe epilepsy Fisiopatologia dos transtornos de humor na epilepsia do lobo temporal

    Directory of Open Access Journals (Sweden)

    Ludmyla Kandratavicius

    2012-10-01

    Full Text Available OBJECTIVE: There is accumulating evidence that the limbic system is pathologically involved in cases of psychiatric comorbidities in temporal lobe epilepsy (TLE patients. Our objective was to develop a conceptual framework describing how neuropathological, neurochemical and electrophysiological aspects might contribute to the development of psychiatric symptoms in TLE and the putative neurobiological mechanisms that cause mood disorders in this patient subgroup. METHODS: In this review, clinical, experimental and neuropathological findings, as well as neurochemical features of the limbic system were examined together to enhance our understanding of the association between TLE and psychiatric comorbidities. Finally, the value of animal models in epilepsy and mood disorders was discussed. CONCLUSIONS:TLE and psychiatric symptoms coexist more frequently than chance would predict. Alterations and neurotransmission disturbance among critical anatomical networks, and impaired or aberrant plastic changes might predispose patients with TLE to mood disorders. Clinical and experimental studies of the effects of seizures on behavior and electrophysiological patterns may offer a model of how limbic seizures increase the vulnerability of TLE patients to precipitants of psychiatric symptoms.OBJETIVO: Há evidências crescentes do envolvimento do sistema límbico nas comorbidades psiquiátricas associadas à epilepsia do lobo temporal (ELT. Nosso objetivo foi descrever o panorama atual das alterações neuropatológicas, neuroquímicas e eletrofisiológicas que podem contribuir para o desenvolvimento de sintomas psiquiátricos na ELT e explorar possíveis mecanismos neurobiológicos que podem levar ao aparecimento das desordens de humor nesse subgrupo de pacientes. MÉTODOS: Achados clínicos, de modelos experimentais e neuropatológicos foram revistos, assim como características neuroquímicas do sistema límbico foram examinadas em conjunto para auxiliar

  10. A spatio-temporal autocorrelation change detection approach using hyper-temporal satellite data

    CSIR Research Space (South Africa)

    Kleynhans, W

    2013-07-01

    Full Text Available -1 IEEE International Geoscience and Remote Sensing Symposium, Melbourne, Australia 21-26 July 2013 A SPATIO-TEMPORAL AUTOCORRELATION CHANGE DETECTION APPROACH USING HYPER-TEMPORAL SATELLITE DATA yzW. Kleynhans, yz,B.P Salmon,zK. J. Wessels...

  11. Cálculo K: uma abordagem alternativa para a relatividade especial

    OpenAIRE

    Conto,G. De; Lima,A.; Ortega,P.H.; Schmitz,E.R.

    2013-01-01

    Neste artigo apresentamos a abordagem alternativa feita por Bondi para a teoria da relatividade especial. Durante o desenvolvimento, analisamos os diagramas de Bondi, recursos visuais dos quais podemos retirar algumas informações sobre os sistemas analisados, e discutimos o fator K da teoria de Bondi, que está no cerne deste trabalho. Posteriormente, discutimos alguns dos principais resultados obtidos pela relatividade especial de Einstein tais como a dilatação temporal, a contração espacial ...

  12. Taller para desarrollar la creatividad

    OpenAIRE

    MARTÍNEZ GUEROLA, BEATRIZ

    2015-01-01

    [ES] Partimos de la base de que la creatividad es una capacidad realmente valiosa, no solo para el ámbito artístico, si no para cualquier aspecto de la vida. Este proyecto está enfocado a un taller diseñado para que a partir de técnicas de expresión gráfico-plásticas podamos estimular y desarrollar la creatividad, principalmente en niños de tercer ciclo de primaria. Con este proyecto relacionamos el arte y la creatividad que se asocia a esté con la educación. Martínez Guerola, B. (2015). T...

  13. El horizonte temporal en el proyecto de restauración

    Directory of Open Access Journals (Sweden)

    Angela Squassina

    2016-12-01

    Full Text Available La distancia existente entre el tiempo filosófico y los diversos condicionantes teóricos o prácticos que rodean a la restauración sirve como excusa para este texto de reflexión sobre el papel determinante de la percepción del tiempo para una ampliación del concepto contemporáneo de monumento, entendido como documento de múltiples lecturas que invita a renovar continuamente la experiencia de su fruición. Asumir el tiempo como una peculiar dimensión de la obra, involucrando también los conceptos asociados de integridad y de degradación, induce a introducir intencionalmente el horizonte temporal en el proyecto de restauración, reforzando la idea del proyecto de intervención como un acto de interpretación siempre abierto.

  14. Spatial soil moisture mapping through multi-temporal analysis of ERS-SAR pri data

    OpenAIRE

    Verhoest, N.; Troch, P. A.; Deckmyn, J.; Paniconi, C.; De Troch, François

    1997-01-01

    La dispersión de microondas de suelo depende de varias características de superficie, como la rugosidad, la vegetación y el contenido de humedad de la capa superior. El conocimiento de la distribución temporal y espacial de este último parámetro es de gran importancia para hidrológico, meteorológico y climatológico de modelado. Sin embargo las mediciones precisas de la distribución espacial de la humedad del suelo con métodos clásicos siempre han sido una tarea difícil. Debido a su dependenci...

  15. What Is Spatio-Temporal Data Warehousing?

    Science.gov (United States)

    Vaisman, Alejandro; Zimányi, Esteban

    In the last years, extending OLAP (On-Line Analytical Processing) systems with spatial and temporal features has attracted the attention of the GIS (Geographic Information Systems) and database communities. However, there is no a commonly agreed definition of what is a spatio-temporal data warehouse and what functionality such a data warehouse should support. Further, the solutions proposed in the literature vary considerably in the kind of data that can be represented as well as the kind of queries that can be expressed. In this paper we present a conceptual framework for defining spatio-temporal data warehouses using an extensible data type system. We also define a taxonomy of different classes of queries of increasing expressive power, and show how to express such queries using an extension of the tuple relational calculus with aggregated functions.

  16. Path integral quantization in the temporal gauge

    International Nuclear Information System (INIS)

    Scholz, B.; Steiner, F.

    1983-06-01

    The quantization of non-Abelian gauge theories in the temporal gauge is studied within Feynman's path integral approach. The standard asymptotic boundary conditions are only imposed on the transverse gauge fields. The fictituous longitudinal gauge quanta are eliminated asymptotically by modified boundary conditions. This abolishes the residual time-independent gauge transformations and leads to a unique fixing of the temporal gauge. The resulting path integral for the generating functional respects automatically Gauss's law. The correct gauge field propagator is derived. It does not suffer from gauge singularities at n x k = 0 present in the usual treatment of axial gauges. The standard principal value prescription does not work. As a check, the Wilson loop in temporal gauge is calculated with the new propagator. To second order (and to all orders in the Abelian case) the result agrees with the one obtained in the Feynman and Coulomb gauge. (orig.)

  17. Dreams and the temporality of consciousness.

    Science.gov (United States)

    MacDuffie, Katherine; Mashour, George A

    2010-01-01

    Understanding dreams has long been considered fundamental to the development of a theory of consciousness. Evidence from neurobiology and neuroimaging research has paved the way for new theories of dreaming that are empirically supported. In this article we argue that dreaming is a unique state of consciousness that incorporates 3 temporal dimensions: experience of the present, processing of the past, and preparation for the future. The temporal complexity of dreams is made possible in part by the unique neurobiological environment of sleep, in which stimuli are internally generated and many of the restrictions associated with waking thought are absent. Because dream consciousness is not determined by sensory stimuli, a flexible integration of past experiences and the forging of novel connections are possible. We argue that disparate dream theories may not be mutually exclusive but rather relate to different temporal domains of the dream state.

  18. Attractive faces temporally modulate visual attention

    Science.gov (United States)

    Nakamura, Koyo; Kawabata, Hideaki

    2014-01-01

    Facial attractiveness is an important biological and social signal on social interaction. Recent research has demonstrated that an attractive face captures greater spatial attention than an unattractive face does. Little is known, however, about the temporal characteristics of visual attention for facial attractiveness. In this study, we investigated the temporal modulation of visual attention induced by facial attractiveness by using a rapid serial visual presentation. Fourteen male faces and two female faces were successively presented for 160 ms, respectively, and participants were asked to identify two female faces embedded among a series of multiple male distractor faces. Identification of a second female target (T2) was impaired when a first target (T1) was attractive compared to neutral or unattractive faces, at 320 ms stimulus onset asynchrony (SOA); identification was improved when T1 was attractive compared to unattractive faces at 640 ms SOA. These findings suggest that the spontaneous appraisal of facial attractiveness modulates temporal attention. PMID:24994994

  19. Dynamic perfusion patterns in temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Dupont, Patrick; Paesschen, Wim van; Zaknun, John J.; Maes, Alex; Tepmongkol, Supatporn; Locharernkul, Chaichon; Vasquez, Silvia; Carpintiero, Silvina; Bal, C.S.; Dondi, Maurizio

    2009-01-01

    To investigate dynamic ictal perfusion changes during temporal lobe epilepsy (TLE). We investigated 37 patients with TLE by ictal and interictal SPECT. All ictal injections were performed within 60 s of seizure onset. Statistical parametric mapping was used to analyse brain perfusion changes and temporal relationships with injection time and seizure duration as covariates. The analysis revealed significant ictal hyperperfusion in the ipsilateral temporal lobe extending to subcortical regions. Hypoperfusion was observed in large extratemporal areas. There were also significant dynamic changes in several extratemporal regions: ipsilateral orbitofrontal and bilateral superior frontal gyri and the contralateral cerebellum and ipsilateral striatum. The study demonstrated early dynamic perfusion changes in extratemporal regions probably involved in both propagation of epileptic activity and initiation of inhibitory mechanisms. (orig.)

  20. Dynamic perfusion patterns in temporal lobe epilepsy

    Energy Technology Data Exchange (ETDEWEB)

    Dupont, Patrick; Paesschen, Wim van [KU Leuven/UZ Gasthuisberg, Nuclear Medicine, Medical Imaging Center and Neurology, Leuven (Belgium); Zaknun, John J. [International Atomic Energy Agency (IAEA), Nuclear Medicine Section, Division of Human Health, Wagramer Strasse 5, PO BOX 200, Vienna (Austria); University Hospital of Innsbruck, Department of Nuclear Medicine, Innsbruck (Austria); Maes, Alex [KU Leuven/UZ Gasthuisberg, Nuclear Medicine, Medical Imaging Center and Neurology, Leuven (Belgium); AZ Groeninge, Nuclear Medicine, Kortrijk (Belgium); Tepmongkol, Supatporn; Locharernkul, Chaichon [Chulalongkorn University, Nuclear Medicine and Neurology, Bangkok (Thailand); Vasquez, Silvia; Carpintiero, Silvina [Fleni Instituto de Investigaciones Neurologicas, Nuclear Medicine, Buenos Aires (Argentina); Bal, C.S. [All India Institute of Medical Sciences, Nuclear Medicine, New Delhi (India); Dondi, Maurizio [International Atomic Energy Agency (IAEA), Nuclear Medicine Section, Division of Human Health, Wagramer Strasse 5, PO BOX 200, Vienna (Austria); Ospedale Maggiore, Nuclear Medicine, Bologna (Italy)

    2009-05-15

    To investigate dynamic ictal perfusion changes during temporal lobe epilepsy (TLE). We investigated 37 patients with TLE by ictal and interictal SPECT. All ictal injections were performed within 60 s of seizure onset. Statistical parametric mapping was used to analyse brain perfusion changes and temporal relationships with injection time and seizure duration as covariates. The analysis revealed significant ictal hyperperfusion in the ipsilateral temporal lobe extending to subcortical regions. Hypoperfusion was observed in large extratemporal areas. There were also significant dynamic changes in several extratemporal regions: ipsilateral orbitofrontal and bilateral superior frontal gyri and the contralateral cerebellum and ipsilateral striatum. The study demonstrated early dynamic perfusion changes in extratemporal regions probably involved in both propagation of epileptic activity and initiation of inhibitory mechanisms. (orig.)

  1. Cáncer de hueso temporal

    OpenAIRE

    Esborrat, Luciano Martín

    2000-01-01

    El cáncer de hueso temporal es una afección muy poco frecuente, siendo su incidencia aproximadamente 1 entre 15.000 oídos patológicos. Es importante aclarar que el término cáncer de hueso temporal se refiere a los procesos neoplásicos malignos de conducto auditivo externo, oído medio y peñasco, excluyendo los cánceres de pabellón auricular, que constituyen el 80% de los cánceres de oído. El término cáncer de oído abarca pues tanto los cánceres de pabellón como los de hueso temporal...

  2. Attractive faces temporally modulate visual attention

    Directory of Open Access Journals (Sweden)

    Koyo eNakamura

    2014-06-01

    Full Text Available Facial attractiveness is an important biological and social signal on social interaction. Recent research has demonstrated that an attractive face captures greater spatial attention than an unattractive face does. Little is known, however, about the temporal characteristics of visual attention for facial attractiveness. In this study, we investigated the temporal modulation of visual attention induced by facial attractiveness by using a rapid serial visual presentation (RSVP. Fourteen male faces and two female faces were successively presented for 160 ms respectively, and participants were asked to identify two female faces embedded among a series of multiple male distractor faces. Identification of a second female target (T2 was impaired when a first target (T1 was attractive compared to neutral or unattractive faces, at 320 ms SOA; identification was improved when T1 was attractive compared to unattractive faces at 640 ms SOA. These findings suggest that the spontaneous appraisal of facial attractiveness modulates temporal attention.

  3. Thalamic changes with mesial temporal sclerosis: MRI

    Energy Technology Data Exchange (ETDEWEB)

    Deasy, N.P.; Jarosz, J.M.; Cox, T.C.S. [Department of Neuroradiology, King' s College Hospital, London (United Kingdom); Elwes, R.C.D. [Department of Neurology, King' s College Hospital, London (United Kingdom); Polkey, C.E. [Department of Neurosurgery, King' s College and Maudsley Hospitals, London (United Kingdom)

    2000-05-01

    We reviewed the preoperative images of 28 patients with pathologically proven mesial temporal sclerosis, to assess thalamic asymmetry and signal change. A further 25 nonsurgical patients with temporal lobe epilepsy and unequivocal, unilateral changes of mesial temporal sclerosis, and 20 controls, were also reviewed. None of the control group had unequivocal asymmetry of the thalamus. There was an ipsilateral asymmetrically small thalamus in five (18 %) of the surgical group and in three (12 %) of the nonsurgical patients. In four cases there was thalamic signal change. In three patients with thalamic volume loss there was ipsilateral hemiatrophy. All patients with an asymmetrically small thalamus had an asymmetrically small fornix and all but one a small ipsilateral mamillary body. (orig.)

  4. Spatio-Temporal Data Exchange Standards

    DEFF Research Database (Denmark)

    Jensen, Christian Søndergaard; Schmidt, Albrecht

    2003-01-01

    We believe that research that concerns aspects of spatio-temporal data management may benefit from taking into account the various standards for spatio-temporal data formats. For example, this may contribute to rendering prototype software “open” and more readily useful. This paper thus identifies...... and briefly surveys standardization in relation to primarily the exchange and integration of spatio-temporal data. An overview of several data exchange languages is offered, along with reviews their potential for facilitating the collection of test data and the leveraging of prototypes. The standards, most...... of which are XML-based, lend themselves to the integration of prototypes into middleware architectures, e.g., as Web services....

  5. Temporal visual cues aid speech recognition

    DEFF Research Database (Denmark)

    Zhou, Xiang; Ross, Lars; Lehn-Schiøler, Tue

    2006-01-01

    of audio to generate an artificial talking-face video and measured word recognition performance on simple monosyllabic words. RESULTS: When presenting words together with the artificial video we find that word recognition is improved over purely auditory presentation. The effect is significant (p......BACKGROUND: It is well known that under noisy conditions, viewing a speaker's articulatory movement aids the recognition of spoken words. Conventionally it is thought that the visual input disambiguates otherwise confusing auditory input. HYPOTHESIS: In contrast we hypothesize...... that it is the temporal synchronicity of the visual input that aids parsing of the auditory stream. More specifically, we expected that purely temporal information, which does not convey information such as place of articulation may facility word recognition. METHODS: To test this prediction we used temporal features...

  6. Exhibidor de cinturones para Montagne

    OpenAIRE

    Galletti, Julia

    2017-01-01

    En el exhibidor de cinturones diseñado para la marca de ropa deportiva Montagne se produjo un trabajo estético-formal en relación a la simbología característica de la marca. Su principal característica es ser un exhibidor 360°, es decir que desde cualquier punto de vista se puede obtener un buen panorama del producto expuesto. Está confeccionado en materiales livianos para facilitar su movilidad dentro del local estipulado (exhibición en vidriera o mostrador). Asimismo, es totalmente desarmab...

  7. Colombia competente para la paz

    Directory of Open Access Journals (Sweden)

    Norma Sofía Vanegas Torres

    2013-07-01

    Full Text Available La paz y la convivencia en Colombia demandan el desarrollo de un enfoque humanístico, una competencia particular que como las restantes competencias implican un saber y un saber hacer dentro de un contexto, pero que en este caso se relacionan más concretamente con el saber vivir. Este artículo analiza el desarrollo de una posible de competencia para la paz y analiza la importancia de la academia como medio para su desarrollo e instrumentalización. Se analizan al mismo tiempo las connotaciones de esta competencia en el marco de la sociedad posmoderna contemporánea.

  8. Behavioral sensitivity of temporally modulated striatal neurons

    Directory of Open Access Journals (Sweden)

    George ePortugal

    2011-07-01

    Full Text Available Recent investigations into the neural mechanisms that underlie temporal perception have revealed that the striatum is an important contributor to interval timing processes, and electrophysiological recording studies have shown that the firing rates of striatal neurons are modulated by the time in a trial at which an operant response is made. However, it remains unclear whether striatal firing rate modulations are related to the passage of time alone (i.e., whether temporal information is represented in an abstract manner independent of other attributes of biological importance, or whether this temporal information is embedded within striatal activity related to co-occurring contextual information, such as motor behaviors. This study evaluated these two hypotheses by recording from striatal neurons while rats performed a temporal production task. Rats were trained to respond at different nosepoke apertures for food reward under two simultaneously active reinforcement schedules: a variable-interval (VI-15 sec schedule and a fixed-interval (FI-15 sec schedule of reinforcement. Responding during a trial occurred in a sequential manner composing 3 phases; VI responding, FI responding, VI responding. The vast majority of task-sensitive striatal neurons (95% varied their firing rates associated with equivalent behaviors (e.g., periods in which their snout was held within the nosepoke across these behavioral phases, and 96% of cells varied their firing rates for the same behavior within a phase, thereby demonstrating their sensitivity to time. However, in a direct test of the abstract timing hypothesis, 91% of temporally modulated hold cells were further modulated by the overt motor behaviors associated with transitioning between nosepokes. As such, these data are inconsistent with the striatum representing time in an abstract’ manner, but support the hypothesis that temporal information is embedded within contextual and motor functions of the

  9. Statistical Mechanics of Temporal and Interacting Networks

    Science.gov (United States)

    Zhao, Kun

    In the last ten years important breakthroughs in the understanding of the topology of complexity have been made in the framework of network science. Indeed it has been found that many networks belong to the universality classes called small-world networks or scale-free networks. Moreover it was found that the complex architecture of real world networks strongly affects the critical phenomena defined on these structures. Nevertheless the main focus of the research has been the characterization of single and static networks. Recently, temporal networks and interacting networks have attracted large interest. Indeed many networks are interacting or formed by a multilayer structure. Example of these networks are found in social networks where an individual might be at the same time part of different social networks, in economic and financial networks, in physiology or in infrastructure systems. Moreover, many networks are temporal, i.e. the links appear and disappear on the fast time scale. Examples of these networks are social networks of contacts such as face-to-face interactions or mobile-phone communication, the time-dependent correlations in the brain activity and etc. Understanding the evolution of temporal and multilayer networks and characterizing critical phenomena in these systems is crucial if we want to describe, predict and control the dynamics of complex system. In this thesis, we investigate several statistical mechanics models of temporal and interacting networks, to shed light on the dynamics of this new generation of complex networks. First, we investigate a model of temporal social networks aimed at characterizing human social interactions such as face-to-face interactions and phone-call communication. Indeed thanks to the availability of data on these interactions, we are now in the position to compare the proposed model to the real data finding good agreement. Second, we investigate the entropy of temporal networks and growing networks , to provide

  10. Graded Alternating-Time Temporal Logic

    Science.gov (United States)

    Faella, Marco; Napoli, Margherita; Parente, Mimmo

    Graded modalities enrich the universal and existential quantifiers with the capability to express the concept of at least k or all but k, for a non-negative integer k. Recently, temporal logics such as μ-calculus and Computational Tree Logic, Ctl, augmented with graded modalities have received attention from the scientific community, both from a theoretical side and from an applicative perspective. Both μ-calculus and Ctl naturally apply as specification languages for closed systems: in this paper, we add graded modalities to the Alternating-time Temporal Logic (Atl) introduced by Alur et al., to study how these modalities may affect specification languages for open systems.

  11. Temporal logics and real time expert systems.

    Science.gov (United States)

    Blom, J A

    1996-10-01

    This paper introduces temporal logics. Due to the eternal compromise between expressive adequacy and reasoning efficiency that must decided upon in any application, full (first order logic or modal logic based) temporal logics are frequently not suitable. This is especially true in real time expert systems, where a fixed (and usually small) response time must be guaranteed. One such expert system, Fagan's VM, is reviewed, and a delineation is given of how to formally describe and reason with time in medical protocols. It is shown that Petri net theory is a useful tool to check the correctness of formalised protocols.

  12. Temporal fringe pattern analysis with parallel computing

    International Nuclear Information System (INIS)

    Tuck Wah Ng; Kar Tien Ang; Argentini, Gianluca

    2005-01-01

    Temporal fringe pattern analysis is invaluable in transient phenomena studies but necessitates long processing times. Here we describe a parallel computing strategy based on the single-program multiple-data model and hyperthreading processor technology to reduce the execution time. In a two-node cluster workstation configuration we found that execution periods were reduced by 1.6 times when four virtual processors were used. To allow even lower execution times with an increasing number of processors, the time allocated for data transfer, data read, and waiting should be minimized. Parallel computing is found here to present a feasible approach to reduce execution times in temporal fringe pattern analysis

  13. Two cases of spontaneous temporal encephalocele.

    Science.gov (United States)

    Kamiya, Kouhei; Mori, Harushi; Kunimatsu, Akira; Kawai, Kensuke; Usami, Kenichi; Ohtomo, Kuni

    2012-12-01

    This is a report of two cases of spontaneous temporal encephalocele: one was anteroinferior and presented with epilepsy; the other was posteroinferior and presented with facial neuritis and labyrinthitis. Spontaneous temporal encephalocele is relatively rare and apparently not familiar to a majority of primary physicians. It may present with a variety of symptoms according to its anatomical location, including cerebrospinal fluid fistulas, recurrent meningitis, chronic otitis media, hearing loss, facial nerve palsy and medically intractable epilepsy. Attention should be paid to this disease entity, as it is easily overlooked in imaging studies and can leave serious neurological deficits. Copyright © 2012 Elsevier Masson SAS. All rights reserved.

  14. Temporal Correlations and Neural Spike Train Entropy

    International Nuclear Information System (INIS)

    Schultz, Simon R.; Panzeri, Stefano

    2001-01-01

    Sampling considerations limit the experimental conditions under which information theoretic analyses of neurophysiological data yield reliable results. We develop a procedure for computing the full temporal entropy and information of ensembles of neural spike trains, which performs reliably for limited samples of data. This approach also yields insight to the role of correlations between spikes in temporal coding mechanisms. The method, when applied to recordings from complex cells of the monkey primary visual cortex, results in lower rms error information estimates in comparison to a 'brute force' approach

  15. Controlling Laser Plasma Instabilities Using Temporal Bandwidth

    Science.gov (United States)

    Tsung, Frank; Weaver, J.; Lehmberg, R.

    2016-10-01

    We are performing particle-in-cell simulations using the code OSIRIS to study the effects of laser plasma interactions in the presence of temporal bandwidth under conditions relevant to current and future experiments on the NIKE laser. Our simulations show that, for sufficiently large bandwidth (where the inverse bandwidth is comparable with the linear growth time), the saturation level, and the distribution of hot electrons, can be effected by the addition of temporal bandwidths (which can be accomplished in experiments using beam smoothing techniques such as ISI). We will quantify these effects and investigate higher dimensional effects such as laser speckles. This work is supported by DOE and NRL.

  16. Temporal Airy pulses control cell poration

    Directory of Open Access Journals (Sweden)

    S. Courvoisier

    2016-07-01

    Full Text Available We show that spectral phase shaping of fs-laser pulses can be used to optimize laser-cell membrane interactions in water environment. The energy and peak intensity thresholds required for cell poration with single pulse in the nJ range can be significantly reduced (25% reduction in energy and 88% reduction in peak intensity by using temporal Airy pulses, controlled by positive third order dispersion, as compared to bandwidth limited pulses. Temporal Airy pulses are also effective to control the morphology of the induced pores, with prospective applications from cellular to tissue opto-surgery and transfection.

  17. Aneurysmal bone cyst of the temporal bone

    International Nuclear Information System (INIS)

    Buxi, Tarvinder; Sud Seema; Vohra, Rakesh; Sud, Aditi; Singh, Satnam

    2004-01-01

    Aneurysmal bone cyst (ABC) of the temporal bone is rare. The nature of the underlying disorder that converted into the ABC might, however, be difficult to ascertain on imaging as well as on histopathology. The unusual CT and MRI findings in a case of ABC of the temporal bone are presented. This had transdural intracerebral spread with a large component of solid enhancing matrix but no peripheral calcific rim. The patient was an adult of 45 years with a history of headache for more than 1 year Copyright (2004) Blackwell Publishing Asia Pty Ltd

  18. Temporal suppression and augmentation of click-evoked otoacoustic emissions

    DEFF Research Database (Denmark)

    Verhulst, Sarah; Harte, James; Dau, Torsten

    2008-01-01

    This study investigates temporal suppression of click-evoked otoacoustic emissions (CEOAEs), occurring when a suppressor-click is presented close in time to a test-click (e.g. 0-8ms). Various temporal suppression methods for examining temporal changes in cochlear compression were evaluated and me...... under test. Temporal suppression was shown to be comparable for CEOAEs and SSOAEs, indicating similar underlying cochlear nonlinear mechanisms. This study contributes to a better understanding of the temporal properties of cochlear dynamics....

  19. Computed tomography of the temporal horns at Alzheimer's disease

    International Nuclear Information System (INIS)

    Gerber, U.; Vogel

    1989-01-01

    In the literature there are different opinions referring to the involvement of the temporal lobes or horns at Alzheimer's disease. Conventionally computed tomogram of the head does not include the temporal horn in its full length. A simple method to demonstrate the temporal horns after cranial computer tomography is described. It allows the evaluation of temporal lobe and temporal horn if questionable alterations at Alzheimer's disease are to be discussed. (orig.) [de

  20. Estructura temporal y gestual del kin-ball

    Directory of Open Access Journals (Sweden)

    Rafael Díaz Amate

    2015-06-01

    Full Text Available El objetivo de este estudio es analizar la estructura temporal del kin-ball y cuantificar el número de golpeos, jugadas, puntos y los tipos de contacto utilizados, en cada período y partido. Se han analizado un total de 13 partidos, correspondientes a la fase de grupos, semifinales y final del VII Campeonato de España de Kin-ball. Es un deporte caracterizado por la realización de esfuerzos interválicos de intensidad media-alta y de corta duración. Un partido de kin-ball tiene una duración media de 46 min aproximadamente, siendo el ratio tiempo de trabajo y tiempo de descanso de 1:1,51 y la duración media por punto de 12,07 s. Así, un partido de kin-ball tiene un volumen de 73 puntos con un total de 390 golpeos. Los tipos de golpeos utilizados determinan que es un deporte defensivo. Todos estos análisis ayudan a tener un mayor conocimiento de esta disciplina deportiva por parte de los entrenadores y jugadores para tener un entrenamiento más específico.

  1. Geographic and temporal trends in the molecular epidemiology and genetic mechanisms of transmitted HIV-1 drug resistance: an individual-patient- and sequence-level meta-analysis

    NARCIS (Netherlands)

    Rhee, Soo-Yon; Blanco, Jose Luis; Jordan, Michael R.; Taylor, Jonathan; Lemey, Philippe; Varghese, Vici; Hamers, Raph L.; Bertagnolio, Silvia; Rinke de Wit, Tobias F.; Aghokeng, Avelin F.; Albert, Jan; Avi, Radko; Avila-Rios, Santiago; Bessong, Pascal O.; Brooks, James I.; Boucher, Charles A. B.; Brumme, Zabrina L.; Busch, Michael P.; Bussmann, Hermann; Chaix, Marie-Laure; Chin, Bum Sik; D'Aquin, Toni T.; de Gascun, Cillian F.; Derache, Anne; Descamps, Diane; Deshpande, Alaka K.; Djoko, Cyrille F.; Eshleman, Susan H.; Fleury, Herve; Frange, Pierre; Fujisaki, Seiichiro; Harrigan, P. Richard; Hattori, Junko; Holguin, Africa; Hunt, Gillian M.; Ichimura, Hiroshi; Kaleebu, Pontiano; Katzenstein, David; Kiertiburanakul, Sasisopin; Kim, Jerome H.; Kim, Sung Soon; Li, Yanpeng; Lutsar, Irja; Morris, Lynn; Ndembi, Nicaise; Ng, Kee Peng; Paranjape, Ramesh S.; Peeters, Martine; Poljak, Mario; Price, Matt A.; Ragonnet-Cronin, Manon L.; Reyes-Terán, Gustavo; Rolland, Morgane; Sirivichayakul, Sunee; Smith, Davey M.; Soares, Marcelo A.; Soriano, Vincent V.; Ssemwanga, Deogratius; Stanojevic, Maja; Stefani, Mariane A.; Sugiura, Wataru; Sungkanuparph, Somnuek; Tanuri, Amilcar; tee, Kok Keng; Truong, Hong-Ha M.; van de Vijver, David A. M. C.; Vidal, Nicole; Yang, Chunfu; Yang, Rongge; Yebra, Gonzalo; Ioannidis, John P. A.; Vandamme, Anne-Mieke; Shafer, Robert W.

    2015-01-01

    Regional and subtype-specific mutational patterns of HIV-1 transmitted drug resistance (TDR) are essential for informing first-line antiretroviral (ARV) therapy guidelines and designing diagnostic assays for use in regions where standard genotypic resistance testing is not affordable. We sought to

  2. Geographic and Temporal Trends in the Molecular Epidemiology and Genetic Mechanisms of Transmitted HIV-1 Drug Resistance: An Individual-Patient- and Sequence-Level Meta-Analysis

    NARCIS (Netherlands)

    S.Y. Rhee (Soo Yoon); J.L. Blanco (Jose Luis); M.R. Jordan (Michael); J. Taylor (Jonathan); P. Lemey (Philippe); V. Varghese (Vici); R.L. Hamers (Raph); S. Bertagnolio (Silvia); M. De Wit (Meike); A.F. Aghokeng (Avelin); J. Albert (Jan); R. Avi (Radko); S. Avila-Rios (Santiago); P.O. Bessong (Pascal O.); J.I. Brooks (James I.); C.A.B. Boucher (Charles); Z.L. Brumme (Zabrina L.); M.P. Busch (Michael P.); H. Bussmann (Hermann); M.L. Chaix (Marie Laure); B.S. Chin (Bum Sik); T.T. D’Aquin (Toni T.); C. de Gascun (Cillian); A. Derache (Anne); D. Descamps (Diane); A.K. Deshpande (Alaka K.); C.F. Djoko (Cyrille F.); S.H. Eshleman (Susan H.); H. Fleury (Hervé); P. Frange (Pierre); S. Fujisaki (Seiichiro); P. Harrigan (Pr); J. Hattori (Junko); A. Holguin (Africa); G.M. Hunt (Gillian M.); H. Ichimura (Hiroshi); P. Kaleebu (Pontiano); D. Katzenstein (David); S. Kiertiburanakul (Sasisopin); J.H. Kim (Jerome H.); S.S. Kim (Sung Soon); Y. Li (Yanpeng); I. Lutsar (Irja); L. Morris (L.); N. Ndembi (Nicaise); K.P. NG (Kee Peng); R.S. Paranjape (Ramesh S.); M.C. Peeters (Marian); M. Poljak (Mario); M.A. Price (Matt A.); M.L. Ragonnet-Cronin (Manon L.); G. Reyes-Terán (Gustavo); M. Rolland (Morgane); S. Sirivichayakul (Sunee); D.M. Smith (Davey M.); M.A. Soares (Marcelo A.); V. Soriano (Virtudes); D. Ssemwanga (Deogratius); M. Stanojevic (Maja); M.A. Stefani (Mariane A.); W. Sugiura (Wataru); S. Sungkanuparph (Somnuek); A. Tanuri (Amilcar); K.K. Tee (Kok Keng); H.-H.M. Truong (Hong-Ha M.); D.A.M.C. van de Vijver (David); N. Vidal (Nicole); C. Yang (Chunfu); R. Yang (Rongge); G. Yebra (Gonzalo); J.P.A. Ioannidis (John); A.M. Vandamme (Anne Mieke); R.W. Shafer (Robert)

    2015-01-01

    textabstractRegional and subtype-specific mutational patterns of HIV-1 transmitted drug resistance (TDR) are essential for informing first-line antiretroviral (ARV) therapy guidelines and designing diagnostic assays for use in regions where standard genotypic resistance testing is not affordable. We

  3. Non-verbal auditory cognition in patients with temporal epilepsy before and after anterior temporal lobectomy

    Directory of Open Access Journals (Sweden)

    Aurélie Bidet-Caulet

    2009-11-01

    Full Text Available For patients with pharmaco-resistant temporal epilepsy, unilateral anterior temporal lobectomy (ATL - i.e. the surgical resection of the hippocampus, the amygdala, the temporal pole and the most anterior part of the temporal gyri - is an efficient treatment. There is growing evidence that anterior regions of the temporal lobe are involved in the integration and short-term memorization of object-related sound properties. However, non-verbal auditory processing in patients with temporal lobe epilepsy (TLE has raised little attention. To assess non-verbal auditory cognition in patients with temporal epilepsy both before and after unilateral ATL, we developed a set of non-verbal auditory tests, including environmental sounds. We could evaluate auditory semantic identification, acoustic and object-related short-term memory, and sound extraction from a sound mixture. The performances of 26 TLE patients before and/or after ATL were compared to those of 18 healthy subjects. Patients before and after ATL were found to present with similar deficits in pitch retention, and in identification and short-term memorisation of environmental sounds, whereas not being impaired in basic acoustic processing compared to healthy subjects. It is most likely that the deficits observed before and after ATL are related to epileptic neuropathological processes. Therefore, in patients with drug-resistant TLE, ATL seems to significantly improve seizure control without producing additional auditory deficits.

  4. The Temporal Organization of Syllabic Structure

    Science.gov (United States)

    Shaw, Jason A.

    2010-01-01

    This dissertation develops analytical tools which enable rigorous evaluation of competing syllabic parses on the basis of temporal patterns in speech production data. The data come from the articulographic tracking of fleshpoints on target speech organs, e.g., tongue, lips, jaw, in experiments with native speakers of American English and Moroccan…

  5. Temporal fossa intra-extracranial dumbbell schwannoma.

    LENUS (Irish Health Repository)

    Wong, Limy

    2011-02-01

    Intra-extracranial schwannomas arising unrelated to major cranial nerves are exceedingly rare neoplasms. We report the case of a 23-year-old male who presented with a 9 month history of progressive temporal swelling which was excised and found histologically to be a schwannoma. A succinct review of the relevant literature is presented.

  6. Temporal fossa intra-extracranial dumbbell schwannoma.

    LENUS (Irish Health Repository)

    Wong, Limy

    2012-02-01

    Intra-extracranial schwannomas arising unrelated to major cranial nerves are exceedingly rare neoplasms. We report the case of a 23-year-old male who presented with a 9 month history of progressive temporal swelling which was excised and found histologically to be a schwannoma. A succinct review of the relevant literature is presented.

  7. Temporal distribution of alcohol related facial fractures.

    Science.gov (United States)

    Lee, Kai H; Qiu, Michael; Sun, Jiandong

    2017-11-01

    This study aimed to address 2 important aspects of temporal pattern in alcohol-related facial fractures: (1) comparison of temporal pattern of alcohol-related facial fracture (alcohol group) presentation with non-alcohol-related fracture (non-alcohol group) presentation; (2) temporal pattern of patient demographic characteristics, injury characteristics, and surgical management in the alcohol group presentation. This study retrospectively examined the Victorian admitted episodes data set (VAED) for the years 2010 to 2013. VAED is a standardized set of data collected during all hospital presentations in Victoria. The study found higher incidence of alcohol-related facial fracture presentations during weekends and during the summer and spring months compared with non-alcohol-related fractures (statistically significant). Alcohol-related facial fractures are more likely to involve male patients in the 20- to 29-year age group, occur as a result of interpersonal violence, and require shorter hospital stays during weekend admissions (statistically significant). No statistically significant relationship has been observed in seasonal variation across all variables. This study found distinct characteristics in temporal distribution of alcohol-related facial fractures. These characteristics are, in particular, significant in weekend trauma admissions. Such information is important in workforce planning, resource distribution, and implementation of injury prevention programs. Copyright © 2017 Elsevier Inc. All rights reserved.

  8. Temporal Coherence Strategies for Augmented Reality Labeling

    DEFF Research Database (Denmark)

    Madsen, Jacob Boesen; Tatzgern, Markus; Madsen, Claus B.

    2016-01-01

    Temporal coherence of annotations is an important factor in augmented reality user interfaces and for information visualization. In this paper, we empirically evaluate four different techniques for annotation. Based on these findings, we follow up with subjective evaluations in a second experiment...

  9. Temporal Order Processing in Adult Dyslexics.

    Science.gov (United States)

    Maxwell, David L.; And Others

    This study investigated the premise that disordered temporal order perception in retarded readers can be seen in the serial processing of both nonverbal auditory and visual information, and examined whether such information processing deficits relate to level of reading ability. The adult subjects included 20 in the dyslexic group, 12 in the…

  10. Working Girls and the Temporality of Efficiency

    Science.gov (United States)

    Hahner, Leslie A.

    2009-01-01

    The public circulation of temporal discourse fashions the way in which subjects experience and value their time. At the turn of the twentieth century, experts in systematic management mandated that wage-earning women must be prodded into efficient labor in order to increase the overall yield of industry. Against this regime of time, the narrator…

  11. Domestic Temporalities: Sensual Patterning in Persian Migratory ...

    African Journals Online (AJOL)

    In this paper, we argue that these intimate practices have references beyond their domestic dimensions, for they point to a worldly movement of life writ domestically small. It is via a sensory network that the spatially and temporally disparate worlds of homeland and new homes are remembered and forgotten, and where ...

  12. Spatial attention does improve temporal discrimination.

    Science.gov (United States)

    Chica, Ana B; Christie, John

    2009-02-01

    It has recently been stated that exogenous attention impairs temporal-resolution tasks (Hein, Rolke, & Ulrich, 2006; Rolke, Dinkelbach, Hein, & Ulrich, 2008; Yeshurun, 2004; Yeshurun & Levy, 2003). In comparisons of performance on spatially cued trials versus neutral cued trials, the results have suggested that spatial attention decreases temporal resolution. However, when performance on cued and uncued trials has been compared in order to equate for cue salience, typically speed-accuracy trade-offs (SATs) have been observed, making the interpretation of the results difficult. In the present experiments, we aimed at studying the effect of spatial attention in temporal resolution while using a procedure to control for SATs. We controlled reaction times (RTs) by constraining the time to respond, so that response decisions would be made within comparable time windows. The results revealed that when RT was controlled, performance was impaired for cued trials as compared with neutral trials, replicating previous findings. However, when cued and uncued trials were compared, performance was actually improved for cued trials as compared with uncued trials. These results suggest that SAT effects may have played an important role in the previous studies, because when they were controlled and measured, the results reversed, revealing that exogenous attention does improve performance on temporal-resolution tasks.

  13. The temporal variability of species densities

    International Nuclear Information System (INIS)

    Redfearn, A.; Pimm, S.L.

    1993-01-01

    Ecologists use the term 'stability' to mean to number of different things (Pimm 1984a). One use is to equate stability with low variability in population density over time (henceforth, temporal variability). Temporal variability varies greatly from species to species, so what effects it? There are at least three sets of factors: the variability of extrinsic abiotic factors, food web structure, and the intrinsic features of the species themselves. We can measure temporal variability using at least three statistics: the coefficient of variation of density (CV); the standard deviation of the logarithms of density (SDL); and the variance in the differences between logarithms of density for pairs of consecutive years (called annual variability, hence AV, b y Wolda 1978). There are advantages and disadvantages to each measure (Williamson 1984), though in our experience, the measures are strongly correlated across sets of taxonomically related species. The increasing availability of long-term data sets allows one to calculate these statistics for many species and so to begin to understand the various causes of species differences in temporal variability

  14. MRI in patients with temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Kodama, Kazuhiro

    1992-01-01

    The present study investigated magnetic resonance imaging (MRI) features in temporal lobe epilepsy and correlated them with clinical variables, such as age, illness duration, past history, and the frequency of seizure. Cerebral MRI was performed in 45 patients with temporal lobe epilepsy of unknown etiology, using a 0.5 T and/or a 1.5 T MRI systems. The temporal lobe was seen as high signal intensity on T2-weighted images and/or proton density-weighted images in 6 patients, although it was missed on CT and T1-weighted images. The high intensity area seemed to reflect sclerosis of the temporal lobe. This finding was significantly associated with partial seizure. Of these patients, 3 had a history of febrile convulsions. Ten patients had slight dilatation of the inferior horn of the lateral ventricle. They were significantly old at the time of onset and examination, as compared with those without dilatation. Furthermore, 6 patients with unilateral dilatation were significantly younger than the other 4 with bilateral dilatation. Nine patients had small multiple high signal areas in white matter, mainly in the parietal lobe, which suggested vascular origin. These patients were significantly old at the time of onset and examination, as compared with those having no such findings. In depicting high signal intensity areas, a 1.5 T MRI system was not always superior to a 0.5 T MRI system. Proton density-weighted images were better than T2-weighted images in some patients. (N.K.)

  15. Gene expression profile in temporal lobe epilepsy

    NARCIS (Netherlands)

    Aronica, Eleonora; Gorter, Jan A.

    2007-01-01

    Epilepsy is one of the most common neurological disorders. Temporal lobe epilepsy (TLE) represents the most frequent epilepsy syndrome in adult patients with resistance to pharmacological treatment. In TLE, the origin of seizure activity typically involves the hippocampal formation, which displays

  16. Gene expression profile in temporal lobe epilepsy.

    NARCIS (Netherlands)

    Aronica, E.M.A.; Gorter, J.A.

    2007-01-01

    Epilepsy is one of the most common neurological disorders. Temporal lobe epilepsy (TLE) represents the most frequent epilepsy syndrome in adult patients with resistance to pharmacological treatment. In TLE, the origin of seizure activity typically involves the hippocampal formation, which displays

  17. Audiovisual laughter detection based on temporal features

    NARCIS (Netherlands)

    Petridis, Stavros; Nijholt, Antinus; Nijholt, A.; Pantic, M.; Pantic, Maja; Poel, Mannes; Poel, M.; Hondorp, G.H.W.

    2008-01-01

    Previous research on automatic laughter detection has mainly been focused on audio-based detection. In this study we present an audiovisual approach to distinguishing laughter from speech based on temporal features and we show that the integration of audio and visual information leads to improved

  18. Reconceptualizing Children's Suggestibility: Bidirectional and Temporal Properties

    Science.gov (United States)

    Gilstrap, Livia L.; Ceci, Stephen J.

    2005-01-01

    Forty-one children (3 to 7 years) were exposed to a staged event and later interviewed by 1 of 41 professional interviewers. All interviews were coded with a detailed, mutually exclusive, and exhaustive coding scheme capturing adult behaviors (leading questions vs. neutral) and child behaviors (acquiescence vs. denial) in a temporally organized…

  19. Spatio-temporal modeling for residential burglary

    NARCIS (Netherlands)

    Mahfoud, M.; Bhulai, Sandjai; van der Mei, R.D.; Bhulai, Sandjai; Kardaras, Dimitris

    2017-01-01

    Spatio-temporal modeling is widely recognized as a promising means for predicting crime patterns. Despite their enormous potential, the available methods are still in their infancy. A lot of research focuses on crime hotspot detection and geographic crime clusters, while a systematic approach to

  20. Cross-modal decoupling in temporal attention.

    Science.gov (United States)

    Mühlberg, Stefanie; Oriolo, Giovanni; Soto-Faraco, Salvador

    2014-06-01

    Prior studies have repeatedly reported behavioural benefits to events occurring at attended, compared to unattended, points in time. It has been suggested that, as for spatial orienting, temporal orienting of attention spreads across sensory modalities in a synergistic fashion. However, the consequences of cross-modal temporal orienting of attention remain poorly understood. One challenge is that the passage of time leads to an increase in event predictability throughout a trial, thus making it difficult to interpret possible effects (or lack thereof). Here we used a design that avoids complete temporal predictability to investigate whether attending to a sensory modality (vision or touch) at a point in time confers beneficial access to events in the other, non-attended, sensory modality (touch or vision, respectively). In contrast to previous studies and to what happens with spatial attention, we found that events in one (unattended) modality do not automatically benefit from happening at the time point when another modality is expected. Instead, it seems that attention can be deployed in time with relative independence for different sensory modalities. Based on these findings, we argue that temporal orienting of attention can be cross-modally decoupled in order to flexibly react according to the environmental demands, and that the efficiency of this selective decoupling unfolds in time. © 2014 Federation of European Neuroscience Societies and John Wiley & Sons Ltd.

  1. Temporal Context, Preference, and Resistance to Change

    Science.gov (United States)

    Podlesnik, Christopher A.; Jimenez-Gomez, Corina; Thrailkill, Eric A.; Shahan, Timothy A.

    2011-01-01

    According to behavioral momentum theory, preference and relative resistance to change in concurrent chains schedules are correlated and reflect the relative conditioned value of discriminative stimuli. In the present study, we explore the generality of this relation by manipulating the temporal context within a concurrent-chains procedure through…

  2. Anterior Temporal Lobe Morphometry Predicts Categorization Ability.

    Science.gov (United States)

    Garcin, Béatrice; Urbanski, Marika; Thiebaut de Schotten, Michel; Levy, Richard; Volle, Emmanuelle

    2018-01-01

    Categorization is the mental operation by which the brain classifies objects and events. It is classically assessed using semantic and non-semantic matching or sorting tasks. These tasks show a high variability in performance across healthy controls and the cerebral bases supporting this variability remain unknown. In this study we performed a voxel-based morphometry study to explore the relationships between semantic and shape categorization tasks and brain morphometric differences in 50 controls. We found significant correlation between categorization performance and the volume of the gray matter in the right anterior middle and inferior temporal gyri. Semantic categorization tasks were associated with more rostral temporal regions than shape categorization tasks. A significant relationship was also shown between white matter volume in the right temporal lobe and performance in the semantic tasks. Tractography revealed that this white matter region involved several projection and association fibers, including the arcuate fasciculus, inferior fronto-occipital fasciculus, uncinate fasciculus, and inferior longitudinal fasciculus. These results suggest that categorization abilities are supported by the anterior portion of the right temporal lobe and its interaction with other areas.

  3. Managing Temporal Knowledge in Port Management Systems

    Directory of Open Access Journals (Sweden)

    Anita Gudelj

    2006-05-01

    Full Text Available Large ports need to deal with a number of disparate activities:the movement of ships, containers and other cargo, theloading and unloading of ships and containers, customs activities.As well as human resources, anchorages, channels, lighters,tugs, berths, warehouse and other storage spaces have to beallocated and released. The efficient management of a port involvesmanaging these activities and resources, managing theflows of money involved between the agents providing and usingthese resources, and providing management information.Many information systems will be involved.Many applications have to deal with a large amount of datawhich not only represent the perceived state of the real world atpresent, but also past and/or future states. These applicationsare not served adequately by today's computer managementand database systems. In particular, deletions and updates insuch systems have destructive semantics. This means that previousdatabase contents (representing previous perceived statesof the real world cannot be accessed anymore.A review of how define temporal data models, based ongeneralizing a non-temporal data model in to a temporal one toimprove port management is presented. This paper describes apractical experiment which supports managing temporal dataalong with the corresponding prototype implementations.

  4. High resolution CT of temporal bone trauma

    International Nuclear Information System (INIS)

    Youn, Eun Kyung

    1986-01-01

    Radiographic studies of the temporal bone following head trauma are indicated when there is cerebrospinal fluid otorrhea or rhinorrhoea, hearing loss, or facial nerve paralysis. Plain radiography displays only 17-30% of temporal bone fractures and pluridirectional tomography is both difficult to perform, particularly in the acutely ill patient, and less satisfactory for the demonstration of fine fractures. Consequently, high resolution CT is the imaging method of choice for the investigation of suspected temporal bone trauma and allows special resolution of fine bony detail comparable to that attainable by conventional tomography. Eight cases of temporal bone trauma examined at Korea General Hospital April 1985 through May 1986. The results were as follows: Seven patients (87%) suffered longitudinal fractures. In 6 patients who had purely conductive hearing loss, CT revealed various ossicular chain abnormality. In one patient who had neuro sensory hearing loss, CT demonstrated intract ossicular with a fracture nearing lateral wall of the lateral semicircular canal. In one patient who had mixed hearing loss, CT showed complex fracture.

  5. Temporal relationship between climate variability, Prosopis juliflora ...

    African Journals Online (AJOL)

    Normalized Difference Vegetation Index (NDVI) data derived from moderate resolution imaging spectroradiometer (MODIS) 250 m satellite imageries for 2000 to 2014 were used to determine the temporal dynamics of P. juliflora invasion in the study area. Both temperature and rainfall trends showed marked variability over ...

  6. A survey of temporal data mining

    Indian Academy of Sciences (India)

    Data mining is concerned with analysing large volumes of (often unstructured) data to automatically discover interesting regularities or relationships which in turn lead to better understanding of the underlying processes. The field of temporal data mining is concerned with such analysis in the case of ordered data streams ...

  7. The temporal dynamics of speeded decision making

    NARCIS (Netherlands)

    Dutilh, G.

    2012-01-01

    This dissertation sheds light on the temporal dynamics of behavior in speeded decision making. Participants on reaction time (RT) tasks learn, get distracted, speed up, slow down, get confused, get bored, and eventually may start guessing. One can safely say that participants' behavior is dynamic.

  8. Temporal fossa hemangiopericytoma: a case series.

    Science.gov (United States)

    Heiser, Marc A; Waldron, James S; Tihan, Tarik; Parsa, Andrew T; Cheung, Steven W

    2009-10-01

    Review clinical experience with temporal fossa hemangiopericytomas (HPCs). Retrospective case series review. Tertiary referral center. Intracranial HPCs within the temporal fossa. Craniotomy for either subtotal or gross total tumor excision. Determination of clinical outcome (alive with no evidence of disease, alive with disease, and died of disease). Five cases of HPC involving the temporal fossa were treated at our tertiary referral center for the period from 1995 to 2008. All but 1 patient were men. The age of presentation ranged from 31 to 62 years, and duration of follow-up ranged from 8 to 153 months. Clinical presentation was protean; headache was the most common symptom. Gross total tumor excision was achieved in 2 patients, whereas subtotal tumor excision was achieved in 3 patients. Reasons for subtotal resection included excessive intraoperative blood loss and inextricable tumor. Histologically, all tumors were composed of tightly packed, randomly oriented (jumbled-up) tumor cells with little intervening collagen. CD34 staining mostly highlighted the vascular background. One patient died of disease, 2 patients were alive with disease, and 2 patients had no evidence of disease. Management of temporal fossa HPC is challenging because clinical presentation is often late, and extent of tumor excision is constrained by vital structures in the cranial base and intracranial contents. A multidisciplinary approach with neurosurgery and neurotology undertaken to achieve the most complete tumor resection possible, whereas minimizing morbidity are likely to confer a longer period of symptom-free survival and improves curability of these difficult lesions.

  9. Affective Temporality: Towards a Fourth Wave

    Science.gov (United States)

    Chamberlain, Prudence

    2016-01-01

    This article considers the way in which the wave has been constructed as a negative means by which to understand feminism, making a case for reconceptualising the wave as an "affective temporality". Focusing on both feeling and historically specific forms of activism, the article suggests that the wave should not be considered as…

  10. A Temporal Concurrent Constraint Programming Calculus

    DEFF Research Database (Denmark)

    Palamidessi, Catuscia; Valencia Posso, Frank Darwin

    2001-01-01

    The tcc model is a formalism for reactive concurrent constraint programming. In this paper we propose a model of temporal concurrent constraint programming which adds to tcc the capability of modeling asynchronous and non-deterministic timed behavior. We call this tcc extension the ntcc calculus...

  11. Temporal Visualization for Legal Case Histories.

    Science.gov (United States)

    Harris, Chanda; Allen, Robert B.; Plaisant, Catherine; Shneiderman, Ben

    1999-01-01

    Discusses visualization of legal information using a tool for temporal information called "LifeLines." Explores ways "LifeLines" could aid in viewing the links between original case and direct and indirect case histories. Uses the case of Apple Computer, Inc. versus Microsoft Corporation and Hewlett Packard Company to…

  12. Anterior Temporal Lobe Morphometry Predicts Categorization Ability

    Directory of Open Access Journals (Sweden)

    Béatrice Garcin

    2018-02-01

    Full Text Available Categorization is the mental operation by which the brain classifies objects and events. It is classically assessed using semantic and non-semantic matching or sorting tasks. These tasks show a high variability in performance across healthy controls and the cerebral bases supporting this variability remain unknown. In this study we performed a voxel-based morphometry study to explore the relationships between semantic and shape categorization tasks and brain morphometric differences in 50 controls. We found significant correlation between categorization performance and the volume of the gray matter in the right anterior middle and inferior temporal gyri. Semantic categorization tasks were associated with more rostral temporal regions than shape categorization tasks. A significant relationship was also shown between white matter volume in the right temporal lobe and performance in the semantic tasks. Tractography revealed that this white matter region involved several projection and association fibers, including the arcuate fasciculus, inferior fronto-occipital fasciculus, uncinate fasciculus, and inferior longitudinal fasciculus. These results suggest that categorization abilities are supported by the anterior portion of the right temporal lobe and its interaction with other areas.

  13. Temporal fidelity in dynamic social networks

    DEFF Research Database (Denmark)

    Stopczynski, Arkadiusz; Sapiezynski, Piotr; Pentland, Alex ‘Sandy’

    2015-01-01

    of the network dynamics can be used to inform the process of measuring social networks. The details of measurement are of particular importance when considering dynamic processes where minute-to-minute details are important, because collection of physical proximity interactions with high temporal resolution...

  14. Role of temporal processing stages by inferior temporal neurons in facial recognition

    Directory of Open Access Journals (Sweden)

    Yasuko eSugase-Miyamoto

    2011-06-01

    Full Text Available In this review, we focus on the role of temporal stages of encoded facial information in the visual system, which might enable the efficient determination of species, identity, and expression. Facial recognition is an important function of our brain and is known to be processed in the ventral visual pathway, where visual signals are processed through areas V1, V2, V4, and the inferior temporal (IT cortex. In the IT cortex, neurons show selective responses to complex visual images such as faces, and at each stage along the pathway the stimulus selectivity of the neural responses becomes sharper, particularly in the later portion of the responses.In the IT cortex of the monkey, facial information is represented by different temporal stages of neural responses, as shown in our previous study: the initial transient response of face-responsive neurons represents information about global categories, i.e., human vs. monkey vs. simple shapes, whilst the later portion of these responses represents information about detailed facial categories, i.e., expression and/or identity. This suggests that the temporal stages of the neuronal firing pattern play an important role in the coding of visual stimuli, including faces. This type of coding may be a plausible mechanism underlying the temporal dynamics of recognition, including the process of detection/categorization followed by the identification of objects. Recent single-unit studies in monkeys have also provided evidence consistent with the important role of the temporal stages of encoded facial information. For example, view-invariant facial identity information is represented in the response at a later period within a region of face-selective neurons. Consistent with these findings, temporally modulated neural activity has also been observed in human studies. These results suggest a close correlation between the temporal processing stages of facial information by IT neurons and the temporal dynamics of

  15. Application of an automated protocol for the analysis of the temporal parameters of the response of reaction tennis players during the execution of split-step and volley Aplicación de un protocolo automatizado para el análisis de los parámetros temporales de la respuesta de reacción en jugadores de tenis durante la ejecución de split-step y volea

    Directory of Open Access Journals (Sweden)

    V. Luis

    2010-09-01

    Full Text Available

    This study is aimed to show the design and application process of an automated system to recording in real time the temporary parameters of tennis players reaction response during the execution of the technical-tactical movement called “split-step and second volley”. The knowledge about temporary characteristics of the action will be make used of identify the variables to cause in that and also to design an investigation to permit an improvement of the tennis players efficiency in this sequence of the play. In this way, the use of the technological system will allow a precise analysis of player’s motor response and the eminent information about the defined action
    KEY WORDS: Tennis, split-step and volley, automated system of measure, reaction response

    El propósito de este trabajo consiste en mostrar el proceso de diseño y la aplicación de un sistema automatizado de medida para el registro en tiempo real de los parámetros temporales de la respuesta de reacción en jugadores de tenis durante la ejecución de una acción técnico-táctica denominada “split-step y segunda volea”. El conocimiento generado en cuanto a las características temporales de la acción se empleará para identificar las variables que determinan la eficacia en la misma y diseñar una investigación que permita optimizar el rendimiento de los tenistas en esta secuencia del juego. Así, el empleo de este sistema tecnológico permitirá un análisis preciso de la respuesta motriz de los jugadores y la extracción de información relevante acerca de la acción definida.
    PALABRAS CLAVE: Tenis, split-step y volea, sistema automatizado de medida, respuesta de reacción.

  16. Sex & vision I: Spatio-temporal resolution

    Directory of Open Access Journals (Sweden)

    Abramov Israel

    2012-09-01

    Full Text Available Abstract Background Cerebral cortex has a very large number of testosterone receptors, which could be a basis for sex differences in sensory functions. For example, audition has clear sex differences, which are related to serum testosterone levels. Of all major sensory systems only vision has not been examined for sex differences, which is surprising because occipital lobe (primary visual projection area may have the highest density of testosterone receptors in the cortex. We have examined a basic visual function: spatial and temporal pattern resolution and acuity. Methods We tested large groups of young adults with normal vision. They were screened with a battery of standard tests that examined acuity, color vision, and stereopsis. We sampled the visual system’s contrast-sensitivity function (CSF across the entire spatio-temporal space: 6 spatial frequencies at each of 5 temporal rates. Stimuli were gratings with sinusoidal luminance profiles generated on a special-purpose computer screen; their contrast was also sinusoidally modulated in time. We measured threshold contrasts using a criterion-free (forced-choice, adaptive psychophysical method (QUEST algorithm. Also, each individual’s acuity limit was estimated by fitting his or her data with a model and extrapolating to find the spatial frequency corresponding to 100% contrast. Results At a very low temporal rate, the spatial CSF was the canonical inverted-U; but for higher temporal rates, the maxima of the spatial CSFs shifted: Observers lost sensitivity at high spatial frequencies and gained sensitivity at low frequencies; also, all the maxima of the CSFs shifted by about the same amount in spatial frequency. Main effect: there was a significant (ANOVA sex difference. Across the entire spatio-temporal domain, males were more sensitive, especially at higher spatial frequencies; similarly males had significantly better acuity at all temporal rates. Conclusion As with other sensory systems

  17. Radiosurgery for Medial Temporal Lobe Epilepsy Resulting from Mesial Temporal Sclerosis.

    Science.gov (United States)

    Gianaris, Thomas; Witt, Thomas; Barbaro, Nicholas M

    2016-01-01

    Medial temporal lobe epilepsy associated with mesial temporal sclerosis (MTS) is perhaps the most well-defined epilepsy syndrome that is responsive to structural interventions such as surgery. Several minimally invasive techniques have arisen that provide additional options for the treatment of MTS while potentially avoiding many of open surgery's associated risks. By evading these risks, they also open up treatment options to patients who otherwise are poor surgical candidates. Radiosurgery is one of the most intensively studied of these alternatives and has found a growing role in the treatment of medial temporal lobe epilepsy. Copyright © 2016 Elsevier Inc. All rights reserved.

  18. MRI findings of temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Nakahara, Ichiro; Yin, Dali; Fukami, Masahiro; Kondo, Seiji; Takeuchi, Juji; Kanemoto, Kousuke; Sengoku, Akira; Kawai, Itsuo

    1992-01-01

    MRI findings were analyzed retrospectively in 46 patients with temporal lobe epilepsy in which the side of epileptogenic focus had been confirmed by EEG studies. T 1 - and T 2 -weighted images were obtained by the use of a 1.0 or 1.5 T superconducting-type MRI machine with a coronal scan perpendicular to the axis of the temporal horn of the lateral ventricle. Additional axial and sagittal scans were performed in some cases. The area of the hippocampal body was measured quantitatively using a computerized image-analysis system in 26 cases in which the hippocampus had been visualized with enough contrast on T 1 -weighted coronal images. Abnormal findings were observed in 31/46 (67%) cases. Hippocampal (HC) and temporal lobe (TL) atrophy were observed in 18/46 (39%) and 23/46 (50%) cases respectively, and the side of the atrophy corresponded with the side of the epileptogenic focus, as confirmed by EEG studies, with specificities of 89% and 74% respectively. A quantitative measurement of the area of the hippocampal body showed unilateral hippocampal atrophy more than 10% in 18/25 (69%) cases (10-25%: 10 cases, 25-50%: 7 cases, 50% 2 abnormality was observed in only 4 cases. Structural lesions were observed in 4 cases including an arachnoid cyst, an astrocytoma in amygdala, the Dandy-Walker syndrome, and tuberous sclerosis, using the more efficient imaging qualities than the CT scan. From these observations, it is apparant that superconducting MRI is extremely useful in the diagnosis of the epileptogenic topography of temporal lobe epilepsy. Particularly, hippocampal atrophy was found to correspond with the side of the epileptogenic focus on EEG with a high specificity; its quantitative evaluation could be one of the most important standards in detecting the operative indications for temporal lobe epilepsy. (author)

  19. Uso da sequência FLAIR-EPI na análise da esclerose mesial temporal EPI-FLAIR sequence in the evaluation of mesial temporal sclerosis

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    Marcos Alberto da Costa Machado Júnior

    2001-06-01

    Full Text Available O objetivo deste estudo é analisar as alterações morfológicas e de intensidade de sinal das regiões hipocampais em pacientes, com epilepsia temporal fármaco-resistente. Para tal, estudamos 8 pacientes com esclerose mesial temporal, utilizando aparelhagem de RM de 1,5T, com sequências Spin Eco - SE, Fast Spin Eco - FSE, Fluid Atenuation Inversion Recovery, com Eco Planar Imaging - FLAIR-EPI. Observamos a superioridade da sequência FLAIR na detecção do aumento da intensidade de sinal da região hipocampal, particularmente com cortes coronais, em relação às sequências SE e FSE, com a vantagem de ser uma técnica de rápida execução. A sequência STIR evidenciou adelgaçamento da cortical do hipocampo, na metade dos casos que apresentavam alteração de sinal.The purpose of this study is to evaluate morpholologycal and signal intensity changes in the hippocampus in patients with medically intractable temporal lobe epilepsy. We studied 8 patients with mesial temporal sclerosis using a 1.5 -T MR and the following sequences Spin Eco- SE, Fast Spin Echo- FSE, Fluid Atenuation Inversion Recovery Echo Planar Imaging - FLAIR-EPI. We noticed a sensitive increase signal intensity on FLAIR- EPI sequences, particularly, in coronal images, than on SE and FSE sequences. The STIR sequence showed a cortical hippocampus atrophy in half of the cases, in whom signal abnormalities were present.

  20. MODELO PARA LA CREACIÓN DEL CONOCIMIENTO PARA PYMES

    Directory of Open Access Journals (Sweden)

    Marino Valencia Rodríguez

    2009-01-01

    Full Text Available La creciente importancia del conocimiento, como nuevo factor de producción, hace que la creación y transferencia se convierta en una de las principales prioridades de las organizaciones. El presente artículo describe tanto los fundamentos de la teoría de los recursos y capacidades de la empresa como el enfoque de la gestión del conocimiento, con sus procesos de generación y transferencia del conocimiento. Estos sirven de guía básica teórica para alcanzar el siguiente objetivo: Diseñar un modelo de generación y transferencia de conocimiento para los procesos de dirección, gestión humana y del conocimiento para PyMES, con el fin de que éstas alcancen mayores niveles de competitividad. El modelo se diseña, a partir del direccionamiento estratégico de la organización. Está conformado por tres etapas, articuladas con elementos y actividades. Las acciones se enfocan en dos factores clave de éxito: la cultura organizacional y la formación. La utilización del modelo permitirá a las PyMES optimizar los recursos y capacidades disponibles, lo cual se refleja en el desempeño del trabajador y en el fortalecimiento de la cultura organizacional.

  1. PET imaging in temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Semah, F.

    2006-01-01

    The research projects on epilepsy addressed two main issues: the pathophysiology of the inter-ictal hypo-metabolism in temporal lobe epilepsy and the role of the basal ganglia in the control of seizure. Our research projects focused primarily on temporal lobe epilepsy: The pathophysiology of inter-ictal hypo-metabolism and its correlation with the epileptogenic network was investigated in patients with mesial temporal lobe epilepsy. Inter-ictal hypo-metabolism is commonly found in mesio-temporal lobe epilepsy (MTLE) but its pathophysiology remains incompletely understood. We hypothesized that metabolic changes reflect the preferential networks involved in ictal discharges. We analyzed the topography of inter-ictal hypo-metabolism according to electro-clinical patterns in 50 patients with unilateral hippocampal sclerosis (HS) and consistent features of MTLE. Based on electro-clinical correlations we identified 4 groups:1) mesial group characterized by mesial seizure onset without evidence of early spread beyond the temporal lobe; 2) anterior mesio-lateral group (AML) with early anterior spread, involving the anterior lateral temporal cortex and insulo-fronto-opercular areas; 3) widespread mesio-lateral group (WML) with widespread spread, involving both anterior and posterior lateral temporal and peri-sylvian areas; 4) bi-temporal group (BT) with early contralateral temporal spread. Results of FDG-PET imaging in each group were compared to control subjects using statistical parametric mapping software (SPM99). MRI data and surgical outcome in each group were compared to metabolic findings. Hypo-metabolism was limited to the hippocampal gyrus, the temporal pole and the insula in the mesial group. Gradual involvement of the lateral temporal cortex, the insula and the peri-sylvian areas was observed in the AML and WML groups. The BT group differed from the others by mild bi-temporal involvement, bilateral insular hypo-metabolism and longer epilepsy duration. MRI

  2. PET imaging in temporal lobe epilepsy

    Energy Technology Data Exchange (ETDEWEB)

    Semah, F. [Service Hospitalier Frederic Joliot, DSV-CEA, 91 Orsay (France)

    2006-07-01

    The research projects on epilepsy addressed two main issues: the pathophysiology of the inter-ictal hypo-metabolism in temporal lobe epilepsy and the role of the basal ganglia in the control of seizure. Our research projects focused primarily on temporal lobe epilepsy: The pathophysiology of inter-ictal hypo-metabolism and its correlation with the epileptogenic network was investigated in patients with mesial temporal lobe epilepsy. Inter-ictal hypo-metabolism is commonly found in mesio-temporal lobe epilepsy (MTLE) but its pathophysiology remains incompletely understood. We hypothesized that metabolic changes reflect the preferential networks involved in ictal discharges. We analyzed the topography of inter-ictal hypo-metabolism according to electro-clinical patterns in 50 patients with unilateral hippocampal sclerosis (HS) and consistent features of MTLE. Based on electro-clinical correlations we identified 4 groups:1) mesial group characterized by mesial seizure onset without evidence of early spread beyond the temporal lobe; 2) anterior mesio-lateral group (AML) with early anterior spread, involving the anterior lateral temporal cortex and insulo-fronto-opercular areas; 3) widespread mesio-lateral group (WML) with widespread spread, involving both anterior and posterior lateral temporal and peri-sylvian areas; 4) bi-temporal group (BT) with early contralateral temporal spread. Results of FDG-PET imaging in each group were compared to control subjects using statistical parametric mapping software (SPM99). MRI data and surgical outcome in each group were compared to metabolic findings. Hypo-metabolism was limited to the hippocampal gyrus, the temporal pole and the insula in the mesial group. Gradual involvement of the lateral temporal cortex, the insula and the peri-sylvian areas was observed in the AML and WML groups. The BT group differed from the others by mild bi-temporal involvement, bilateral insular hypo-metabolism and longer epilepsy duration. MRI

  3. Anatomical pathways for auditory memory II: Information from rostral superior temporal gyrus to dorsolateral temporal pole and medial temporal cortex.

    Directory of Open Access Journals (Sweden)

    Monica eMunoz-Lopez

    2015-05-01

    Full Text Available Auditory recognition memory in non-human primates differs from recognition memory in other sensory systems. Monkeys learn the rule for visual and tactile delayed matching-to-sample within a few sessions, and then show one-trial recognition memory lasting 10-20 minutes. In contrast, monkeys require hundreds of sessions to master the rule for auditory recognition, and then show retention lasting no longer than 30-40 seconds. Moreover, unlike the severe effects of rhinal lesions on visual memory, such lesions have no effect on the monkeys’ auditory memory performance. It is possible, therefore, that the anatomical pathways differ. Long-term visual recognition memory requires anatomical connections from the visual association area TE with areas 35 and 36 of the perirhinal cortex (PRC. We examined whether there is a similar anatomical route for auditory processing, or that poor auditory recognition memory may reflect the lack of such a pathway. Our hypothesis is that an auditory pathway for recognition memory originates in the higher order processing areas of the rostral superior temporal gyrus (rSTG, and then connects via the dorsolateral temporal pole to access the rhinal cortex of the medial temporal lobe. To test this, we placed retrograde (3% FB and 2% DY and anterograde (10% BDA 10,000 MW tracer injections in rSTG and the dorsolateral area 38DL of the temporal pole. Results showed that area 38DL receives dense projections from auditory association areas Ts1, TAa, TPO of the rSTG, from the rostral parabelt and, to a lesser extent, from areas Ts2-3 and PGa. In turn, area 38DL projects densely to area 35 of PRC, entorhinal cortex, and to areas TH/TF of the posterior parahippocampal cortex. Significantly, this projection avoids most of area 36r/c of PRC. This anatomical arrangement may contribute to our understanding of the poor auditory memory of rhesus monkeys.

  4. Anatomical pathways for auditory memory II: information from rostral superior temporal gyrus to dorsolateral temporal pole and medial temporal cortex.

    Science.gov (United States)

    Muñoz-López, M; Insausti, R; Mohedano-Moriano, A; Mishkin, M; Saunders, R C

    2015-01-01

    Auditory recognition memory in non-human primates differs from recognition memory in other sensory systems. Monkeys learn the rule for visual and tactile delayed matching-to-sample within a few sessions, and then show one-trial recognition memory lasting 10-20 min. In contrast, monkeys require hundreds of sessions to master the rule for auditory recognition, and then show retention lasting no longer than 30-40 s. Moreover, unlike the severe effects of rhinal lesions on visual memory, such lesions have no effect on the monkeys' auditory memory performance. The anatomical pathways for auditory memory may differ from those in vision. Long-term visual recognition memory requires anatomical connections from the visual association area TE with areas 35 and 36 of the perirhinal cortex (PRC). We examined whether there is a similar anatomical route for auditory processing, or that poor auditory recognition memory may reflect the lack of such a pathway. Our hypothesis is that an auditory pathway for recognition memory originates in the higher order processing areas of the rostral superior temporal gyrus (rSTG), and then connects via the dorsolateral temporal pole to access the rhinal cortex of the medial temporal lobe. To test this, we placed retrograde (3% FB and 2% DY) and anterograde (10% BDA 10,000 mW) tracer injections in rSTG and the dorsolateral area 38 DL of the temporal pole. Results showed that area 38DL receives dense projections from auditory association areas Ts1, TAa, TPO of the rSTG, from the rostral parabelt and, to a lesser extent, from areas Ts2-3 and PGa. In turn, area 38DL projects densely to area 35 of PRC, entorhinal cortex (EC), and to areas TH/TF of the posterior parahippocampal cortex. Significantly, this projection avoids most of area 36r/c of PRC. This anatomical arrangement may contribute to our understanding of the poor auditory memory of rhesus monkeys.

  5. Semantic memory is impaired in patients with unilateral anterior temporal lobe resection for temporal lobe epilepsy.

    Science.gov (United States)

    Lambon Ralph, Matthew A; Ehsan, Sheeba; Baker, Gus A; Rogers, Timothy T

    2012-01-01

    Contemporary clinical and basic neuroscience studies have increasingly implicated the anterior temporal lobe regions, bilaterally, in the formation of coherent concepts. Mounting convergent evidence for the importance of the anterior temporal lobe in semantic memory is found in patients with bilateral anterior temporal lobe damage (e.g. semantic dementia), functional neuroimaging and repetitive transcranial magnetic stimulation studies. If this proposal is correct, then one might expect patients with anterior temporal lobe resection for long-standing temporal lobe epilepsy to be semantically impaired. Such patients, however, do not present clinically with striking comprehension deficits but with amnesia and variable anomia, leading some to conclude that semantic memory is intact in resection for temporal lobe epilepsy and thus casting doubt over the conclusions drawn from semantic dementia and linked basic neuroscience studies. Whilst there is a considerable neuropsychological literature on temporal lobe epilepsy, few studies have probed semantic memory directly, with mixed results, and none have undertaken the same type of systematic investigation of semantic processing that has been conducted with other patient groups. In this study, therefore, we investigated the semantic performance of 20 patients with resection for chronic temporal lobe epilepsy with a full battery of semantic assessments, including more sensitive measures of semantic processing. The results provide a bridge between the current clinical observations about resection for temporal lobe epilepsy and the expectations from semantic dementia and other neuroscience findings. Specifically, we found that on simple semantic tasks, the patients' accuracy fell in the normal range, with the exception that some patients with left resection for temporal lobe epilepsy had measurable anomia. Once the semantic assessments were made more challenging, by probing specific-level concepts, lower frequency

  6. Unilateral mesial temporal atrophy after a systemic insult as a possible etiology of refractory temporal lobe epilepsy: case report Esclerose mesial temporal unilateral após insulto sistêmico como possível etiologia de epilepsia refratária do lobo temporal: relato de caso

    Directory of Open Access Journals (Sweden)

    Arthur Cukiert

    1997-09-01

    Full Text Available Mesial temporal sclerosis is the main pathological substrate present in refractory temporal lobe epilepsy and its presence is often related to the occurrence of febrile seizures in infancy. There is an on-going discussion on the nature of mesial temporal sclerosis as it related to epilepsy: cause or consequence. A previously normal child developed hyperosmolar coma after abdominal surgery at the age of 6. Three months afterwards he developed simple and complex partial seizures with an increasing frequency and refractory to multiple mono-and polytherapic drug regimens. He was evaluated for surgery at the age of 13. Ictal and interictal recordings showed left temporal lobe abnormalities. Early CT scaning suggested left temporal atrophy. MRI showed mesial temporal sclerosis. Neuropsichological testing showed verbal memory deficits and he passed a left carotid artery amytal injection. He was submitted to a cortico-amygdalo-hippocampectomy and has been seizure-free since then. The clinical data obtained from this patient suggest that at least in this case mesial temporal sclerosis would be related to the cause of epilepsy and not resultant from repeated seizure activity.A esclerose mesial temporal é o principal substrato anatomo-patológico envolvido na epilepsia refratária do lobo temporal e está frequentemente associada à ocorrência de convulsões febris na infância. Persiste até o momento intensa discussão se a esclerose mesial seria causa ou consequência da síndrome epiléptica. Uma criança previamente normal, desenvolveu coma hiperosmolar após intercorrência em cirurgia abdominal aos 6 anos de idade. Após 3 meses iniciaram-se crises parciais simples e complexas em frequência ascendente e refratárias a múltiplos esquemas terapêuticos em mono- e politerapia. Ele realizou investigação pré-operatória para epilepsia aos 13 anos de idade. Registros eletrencefalográficos de superfície ictais e interictais mostraram anormalidades

  7. A Flexible Spatio-Temporal Model for Air Pollution with Spatial and Spatio-Temporal Covariates

    OpenAIRE

    Lindström, Johan; Szpiro, Adam A; Sampson, Paul D; Oron, Assaf P; Richards, Mark; Larson, Tim V; Sheppard, Lianne

    2013-01-01

    The development of models that provide accurate spatio-temporal predictions of ambient air pollution at small spatial scales is of great importance for the assessment of potential health effects of air pollution. Here we present a spatio-temporal framework that predicts ambient air pollution by combining data from several different monitoring networks and deterministic air pollution model(s) with geographic information system (GIS) covariates. The model presented in this paper has been implem...

  8. Surgical Considerations of Intractable Mesial Temporal Lobe Epilepsy

    Science.gov (United States)

    Boling, Warren W.

    2018-01-01

    Surgery of temporal lobe epilepsy is the best opportunity for seizure freedom in medically intractable patients. The surgical approach has evolved to recognize the paramount importance of the mesial temporal structures in the majority of patients with temporal lobe epilepsy who have a seizure origin in the mesial temporal structures. For those individuals with medically intractable mesial temporal lobe epilepsy, a selective amygdalohippocampectomy surgery can be done that provides an excellent opportunity for seizure freedom and limits the resection to temporal lobe structures primarily involved in seizure genesis. PMID:29461485

  9. Surgical Considerations of Intractable Mesial Temporal Lobe Epilepsy

    Directory of Open Access Journals (Sweden)

    Warren W. Boling

    2018-02-01

    Full Text Available Surgery of temporal lobe epilepsy is the best opportunity for seizure freedom in medically intractable patients. The surgical approach has evolved to recognize the paramount importance of the mesial temporal structures in the majority of patients with temporal lobe epilepsy who have a seizure origin in the mesial temporal structures. For those individuals with medically intractable mesial temporal lobe epilepsy, a selective amygdalohippocampectomy surgery can be done that provides an excellent opportunity for seizure freedom and limits the resection to temporal lobe structures primarily involved in seizure genesis.

  10. CAMBIO CLIMÁTICO Y VARIABILIDAD ESPACIO - TEMPORAL DE LA PRECIPITACIÓN EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Andrés Felipe Hurtado Montoya

    Full Text Available Se revisan los estudios existentes sobre el impacto del cambio climático en la precipitación en Colombia. Se argumenta a favor del análisis de las observaciones y se resaltan las limitaciones de los modelos para predecir el impacto futuro. A partir de la reconstrucción histórica de la precipitación en Colombia, conformada por 384 mapas de precipitación mensual en el periodo 1975-2006 a una resolución espacial de 5 minutos de arco, se estudia la variabilidad espacio - temporal de una de las principales variables del ciclo hidrológico. El trabajo investigativo realizado sobre la serie de mapas disponibles consistió en la estimación y análisis de Funciones Ortogonales Empíricas, Componentes Principales y pruebas estadísticas de homogeneidad para la detección de cambios o tendencias en el tiempo de precipitación mensual en Colombia. El estudio avanza en el entendimiento de la variabilidad espacio - temporal del recurso hídrico en el país, así como en la identificación de señales y efectos del cambio climático. Se termina con una breve reflexión sobre los problemas de investigación derivados del cambio climático.

  11. Spatial-Temporal Clustering of Tornadoes

    Science.gov (United States)

    Malamud, Bruce D.; Turcotte, Donald L.; Brooks, Harold E.

    2017-04-01

    The standard measure of the intensity of a tornado is the Enhanced Fujita scale, which is based qualitatively on the damage caused by a tornado. An alternative measure of tornado intensity is the tornado path length, L. Here we examine the spatial-temporal clustering of severe tornadoes, which we define as having path lengths L ≥ 10 km. Of particular concern are tornado outbreaks, when a large number of severe tornadoes occur in a day in a restricted region. We apply a spatial-temporal clustering analysis developed for earthquakes. We take all pairs of severe tornadoes in observed and modelled outbreaks, and for each pair plot the spatial lag (distance between touchdown points) against the temporal lag (time between touchdown points). We apply our spatial-temporal lag methodology to the intense tornado outbreaks in the central United States on 26 and 27 April 2011, which resulted in over 300 fatalities and produced 109 severe (L ≥ 10 km) tornadoes. The patterns of spatial-temporal lag correlations that we obtain for the 2 days are strikingly different. On 26 April 2011, there were 45 severe tornadoes and our clustering analysis is dominated by a complex sequence of linear features. We associate the linear patterns with the tornadoes generated in either a single cell thunderstorm or a closely spaced cluster of single cell thunderstorms moving at a near-constant velocity. Our study of a derecho tornado outbreak of six severe tornadoes on 4 April 2011 along with modelled outbreak scenarios confirms this association. On 27 April 2011, there were 64 severe tornadoes and our clustering analysis is predominantly random with virtually no embedded linear patterns. We associate this pattern with a large number of interacting supercell thunderstorms generating tornadoes randomly in space and time. In order to better understand these associations, we also applied our approach to the Great Plains tornado outbreak of 3 May 1999. Careful studies by others have associated

  12. Time series analysis of temporal networks

    Science.gov (United States)

    Sikdar, Sandipan; Ganguly, Niloy; Mukherjee, Animesh

    2016-01-01

    A common but an important feature of all real-world networks is that they are temporal in nature, i.e., the network structure changes over time. Due to this dynamic nature, it becomes difficult to propose suitable growth models that can explain the various important characteristic properties of these networks. In fact, in many application oriented studies only knowing these properties is sufficient. For instance, if one wishes to launch a targeted attack on a network, this can be done even without the knowledge of the full network structure; rather an estimate of some of the properties is sufficient enough to launch the attack. We, in this paper show that even if the network structure at a future time point is not available one can still manage to estimate its properties. We propose a novel method to map a temporal network to a set of time series instances, analyze them and using a standard forecast model of time series, try to predict the properties of a temporal network at a later time instance. To our aim, we consider eight properties such as number of active nodes, average degree, clustering coefficient etc. and apply our prediction framework on them. We mainly focus on the temporal network of human face-to-face contacts and observe that it represents a stochastic process with memory that can be modeled as Auto-Regressive-Integrated-Moving-Average (ARIMA). We use cross validation techniques to find the percentage accuracy of our predictions. An important observation is that the frequency domain properties of the time series obtained from spectrogram analysis could be used to refine the prediction framework by identifying beforehand the cases where the error in prediction is likely to be high. This leads to an improvement of 7.96% (for error level ≤20%) in prediction accuracy on an average across all datasets. As an application we show how such prediction scheme can be used to launch targeted attacks on temporal networks. Contribution to the Topical Issue

  13. Coccocypselum pulchellum (Rubiaceae, nuevo registro para Argentina

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    Elsa L. Cabral

    2007-01-01

    Full Text Available Se cita Coccocypselum pulchellum por primera vez para Argentina, en Predio Guaraní, Misiones. Esta es la tercera especie de Coccocypselum registrada para la flora de Argentina junto con C. hasslerianum y C. lanceolatum. Se incluyen descripciones, ilustraciones y una clave para reconocer las tres especies argentinas de Coccocypselum.

  14. Non-invasive examinations successfully select patients with medial temporal lobe epilepsy for anterior temporal lobectomy

    Energy Technology Data Exchange (ETDEWEB)

    Morioka, Takato; Nishio, Shunji; Kawamura, Tadao; Fukui, Kimiko; Sasaki, Masayuki; Fukui, Masashi [Kyushu Univ., Fukuoka (Japan). Graduate School of Medical Sciences

    2001-06-01

    We retrospectively analyzed 8 patients with intractable medial temporal lobe epilepsy (MTLE) who underwent the anterior temporal lobectomy with hippocampectomy (ATL) without invasive examinations such as chronic subdural electrode recording. Five patients had a history of febrile convulsion. While all 8 patients had oral automatism, automatism of ipsilateral limbs with dystonic posture of contralateral limbs was demonstrated in 2 patients. Bilateral temporal paroxysmal activities on interictal EEG was observed in 4 patients and all patients had clear ictal onset zone on unilateral anterior temporal region. MRI demonstrated unilateral hippocampal sclerosis in 5 cases. Interictal FDG-PET depicted hypometabolism of the unilateral temporal lobe in all cases, however, ECD-SPECT failed to reveal the hypoperfusion of the unilateral temporal lobe in a case. Postoperatively, 7 cases became seizure free, and one had rare seizure. Non-invasive examinations, especially ictal EEG and concordant FDG-PET findings, in patients with oral automatism in seizure semiology, successfully select patients with MTLE for ATL. (author)

  15. Effect of Temporal Neocortical Pathology on Seizure Freeness in Adult Patients with Temporal Lobe Epilepsy.

    Science.gov (United States)

    Kemerdere, Rahsan; Ahmedov, Merdin Lyutviev; Alizada, Orkhan; Yeni, Seher Naz; Oz, Buge; Tanriverdi, Taner

    2018-05-23

    Temporal lobe epilepsy (TLE) is the most common form of focal epilepsy. Focal cortical dysplasia is the most common dual pathology found in association with the hippocampal sclerosis. In this study, the effect of dual pathology on freedom from seizure was sought in patients with TLE. This study performed a retrospective analysis of patients with TLE who underwent surgery between 2010 and 2017. Histopathologic analysis was performed on patients with and without dual pathology in the temporal neocortex. Seizure outcomes were compared. A total of 54 patients with TLE were included. The rate of overall favorable seizure outcome was found to be 96.3%. In 53.7%, dual pathology was present in the temporal cortices in addition to the hippocampal sclerosis. Patients without dual pathology showed significantly greater freedom from seizure (P = 0.02). Patients without dual pathology had a significantly higher seizure-free rate after anterior temporal resection than patients with dual pathology. Resection of the temporal cortex in addition to mesial temporal structures seems to be reasonable for better seizure outcome. Copyright © 2018 Elsevier Inc. All rights reserved.

  16. Non-invasive examinations successfully select patients with medial temporal lobe epilepsy for anterior temporal lobectomy

    International Nuclear Information System (INIS)

    Morioka, Takato; Nishio, Shunji; Kawamura, Tadao; Fukui, Kimiko; Sasaki, Masayuki; Fukui, Masashi

    2001-01-01

    We retrospectively analyzed 8 patients with intractable medial temporal lobe epilepsy (MTLE) who underwent the anterior temporal lobectomy with hippocampectomy (ATL) without invasive examinations such as chronic subdural electrode recording. Five patients had a history of febrile convulsion. While all 8 patients had oral automatism, automatism of ipsilateral limbs with dystonic posture of contralateral limbs was demonstrated in 2 patients. Bilateral temporal paroxysmal activities on interictal EEG was observed in 4 patients and all patients had clear ictal onset zone on unilateral anterior temporal region. MRI demonstrated unilateral hippocampal sclerosis in 5 cases. Interictal FDG-PET depicted hypometabolism of the unilateral temporal lobe in all cases, however, ECD-SPECT failed to reveal the hypoperfusion of the unilateral temporal lobe in a case. Postoperatively, 7 cases became seizure free, and one had rare seizure. Non-invasive examinations, especially ictal EEG and concordant FDG-PET findings, in patients with oral automatism in seizure semiology, successfully select patients with MTLE for ATL. (author)

  17. FRANQUICIAS. Una Alternativa para Emprendedores

    Directory of Open Access Journals (Sweden)

    Jorge Enrique Silva Duarte

    2003-07-01

    Full Text Available Este artículo presenta las ventajas de las franquicias como alternativa de negocios. Para un emprendedor exitoso ya establecido es más rentable permitir el uso de su conocimiento explícito mediante el formato de negocio de su firma y recibir regalías mensuales sobre las ventas brutas, que invertir en la apertura de cada nuevo punto. Igualmente, para quien desee iniciarse como empresario, la modalidad de franquicia es muy interesante: en primer lugar, porque empieza con un negocio ya probado, utiliza la imagen extendida de la franquicia y recibe un apoyo corporativo del franquiciador; adicionalmente, detrás del formato de negocio que contrata, está el capital relacional, en otras palabras, la experticia del franquiciador, el conocimiento del mercado, la base de clientes y de proveedores y el capital humano.

  18. Financiamiento para construir la finca.

    Directory of Open Access Journals (Sweden)

    Túpac Barahona.

    1998-08-01

    Full Text Available Las instituciones financieras convencionales y no convencionales tienden a excluir de los servicios de crédito a los sectores más frágiles del campesinado, por considerarlos clientes altamente riesgosos. En este artículo, se discute el sentido económico y social que tendrían que desarrollar esquemas de financiamiento para campesinos con economías débiles, pero con un potencial de desarrollo latente.

  19. Argumentos para repensar el "desarrollo"

    Directory of Open Access Journals (Sweden)

    María Luisa Eschenhagen

    2001-06-01

    Full Text Available Con este trabajo se quiere hacer una aproximación al problema desde una perspectiva diferente, considerando nuevos argumentos que hasta hace muy poco tiempo no se habían tenido en cuenta y que se vienen formulando de una manera muy interesante en los últimos años. El objetivo del artículo es presentar tres argumentos para señalar la necesidad de repensar, desde sus fundamentos, el concepto de desarrollo.

  20. Approximate Entropy as a measure of complexity in sap flow temporal dynamics of two tropical tree species under water deficit

    Directory of Open Access Journals (Sweden)

    Gustavo M. Souza

    2004-09-01

    Full Text Available Approximate Entropy (ApEn, a model-independent statistics to quantify serial irregularities, was used to evaluate changes in sap flow temporal dynamics of two tropical species of trees subjected to water deficit. Water deficit induced a decrease in sap flow of G. ulmifolia, whereas C. legalis held stable their sap flow levels. Slight increases in time series complexity were observed in both species under drought condition. This study showed that ApEn could be used as a helpful tool to assess slight changes in temporal dynamics of physiological data, and to uncover some patterns of plant physiological responses to environmental stimuli.Entropia Aproximada (ApEn, um modelo estatístico independente para quantificar irregularidade em séries temporais, foi utilizada para avaliar alterações na dinâmica temporal do fluxo de seiva em duas espécies arbóreas tropicais submetidas à deficiência hídrica. A deficiência hídrica induziu uma grande redução no fluxo de seiva em G. ulmifolia, enquanto que na espécie C. legalis manteve-se estável. A complexidade das séries temporais foi levemente aumentada sob deficiência hídrica. O estudo mostrou que ApEn pode ser usada como um método para detectar pequenas alterações na dinâmica temporal de dados fisiológicos, e revelar alguns padrões de respostas fisiológicas a estímulos ambientais.

  1. para asegurar un hijo sano

    Directory of Open Access Journals (Sweden)

    Carmen Amarilis Guerra de Castillo

    2006-01-01

    Full Text Available Esta investigación etnográfica focalizada exploró las creencias, los valores, los hábitos y los padrones comportamentales de las embarazadas diabéticas atendidas en el Hospital Doctor Enrique Tejera, quienes residen en tres comunidades urbanas pobres de la ciudad de Valencia - Venezuela, con el objetivo de encontrar el significado del cuidado de si para dichas grávidas. Se utilizó como referencial teórico el Modelo del Análisis de la Salud y la Teoría Antropológica de la Salud, siendo fundamentales para revelar aquello que estaba implícito en el comportamiento de las mujeres con relación a su cuidado. Surgieron tres temas: la salud y la enfermedad - valores culturales del cuidado de si; las prácticas del cuidado de la salud y cuidándose en el embarazo garantiza tener un hijo más saludable. Los temas culturales revelaron que las creencias, los valores, los hábitos y los patrones culturales comportamentales, conforme las tres maneras de acción identificadas, pueden ser preservadas, acomodadas y re-estructuradas para proporcionar un cuidado culturalmente congruente.

  2. Condiciones para el aprendizaje organizacional

    Directory of Open Access Journals (Sweden)

    Delio Ignacio Castañeda

    2015-01-01

    Full Text Available El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compañías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conveniencia, con el apoyo de los jefes de recursos humanos de 3 organizaciones con sede en la ciudad de Bogotá, Colombia. Para la recolección de los datos se utilizó una escala Likert de 5 niveles de respuesta. Los resultados sugieren que las 4 condiciones estudiadas contribuyen al aprendizaje organizacional. Los hallazgos de este trabajo orientan a profesionales sobre dónde focalizar esfuerzos para promover la adquisición y la generación de conocimiento organizacional y aporta al trabajo investigativo ampliando la evidencia empírica sobre este campo de relevancia organizacional.

  3. Condiciones para el aprendizaje organizacional

    Directory of Open Access Journals (Sweden)

    Delio Ignacio Castañeda

    2015-01-01

    Full Text Available El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compa˜nías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conveniencia, con el apoyo de los jefes de recursos humanos de 3 organizaciones con sede en la ciudad de Bogotá, Colombia. Para la recolección de los datos se utilizó una escala Likert de 5 niveles de respuesta. Los resultados sugieren que las 4 condiciones estudiadas contribuyen al aprendizaje organizacional. Los hallazgos de este trabajo orientan a profesionales sobre dónde focalizar esfuerzos para promover la adquisición y la generación de conocimiento organizacional y aporta al trabajo investigativo ampliando la evidencia empírica sobre este campo de relevancia organizacional.

  4. Temporal Architecture: Poetic Dwelling in Japanese buildings

    Directory of Open Access Journals (Sweden)

    Michael Lazarin

    2014-07-01

    Full Text Available Heidegger’s thinking about poetic dwelling and Derrida’s impressions of Freudian estrangement are employed to provide a constitutional analysis of the experience of Japanese architecture, in particular, the Japanese vestibule (genkan. This analysis is supplemented by writings by Japanese architects and poets. The principal elements of Japanese architecture are: (1 ma, and (2 en. Ma is usually translated as ‘interval’ because, like the English word, it applies to both space and time.  However, in Japanese thinking, it is not so much an either/or, but rather a both/and. In other words, Japanese architecture emphasises the temporal aspect of dwelling in a way that Western architectural thinking usually does not. En means ‘joint, edge, the in-between’ as an ambiguous, often asymmetrical spanning of interior and exterior, rather than a demarcation of these regions. Both elements are aimed at producing an experience of temporality and transiency.

  5. Temporal bone radiography using the orthopantomograph

    International Nuclear Information System (INIS)

    Tatezawa, T.

    1981-01-01

    Temporal bone radiographs obtained with an Orthopantomograph were compared with conventional radiographs. In acoustic neurinoma, cholesteatoma, otitis media, and middle fossa tumors, both methods demonstrated the abnormalities well. In two cases with lesions extending beyond the range of conventional projections, the broad orthopantomographic coverage was very valuable. Mastoid air cells, the mastoid process, petrous ridge, and internal auditory meatus were well demonstrated by both techniques. Orthopantomography was found to be superior in the demonstration of the petrous apex, while the superior semicircular canal was better demonstrated on the conventional views. Bilateral symmetry was particularly good and because of fewer films, radiation exposure was considerably less with orthopantomography. For many applications, orthopantomography is an adequate convenient substitute for conventional methods of examining the temporal bones

  6. The temporal relationship between schizophrenia and crime

    DEFF Research Database (Denmark)

    Munkner, Runa; Haastrup, Soeren; Joergensen, Torben

    2003-01-01

    BACKGROUND: Little is known about the temporal relationship between illness onset and the possible beginning of a criminal career among people with schizophrenia, even though criminality, especially violent criminality, has been shown to be more common among people with schizophrenia than among...... people in general. AIM: The aim of this study was to analyse the temporal relationship between registered crime and contact to the psychiatric hospital system. METHOD: This is a register-based study merging data on the psychiatric career with criminal records. RESULTS: Among the males with schizophrenia......, 37% started a criminal career and 13% had committed first violent crime before first contact with the psychiatric hospital system. CONCLUSION: The criminality committed before first contact to the psychiatric hospital system is substantial, especially among males with schizophrenia....

  7. MR imaging of temporal lobe meningoencephalocele

    International Nuclear Information System (INIS)

    Tampieri, D.; Leblanc, R.; Melangon, D.; del-Carpio-O'Donovan, R.; Ethier, R.

    1991-01-01

    Basal meningoencephaloceles represent a rare entity, and they may be associated with a variety of midline cerebral abnormalities. The classification of basal meningoencephaloceles is related to their anatomic location. This paper reports experience in 3 patients, 2 who have temporal lobe epilepsy and a bone defect in the region of the foramen rotondum. In these 2 patients the encephalocele and its covering were protruding into the pterygopalatine fossa without any orbital involvement. The third patient presented with cerebrospinal fluid rhinorrhea caused by a transsphenoidal meningoencephalocele. MR imaging is the examination of choice for detecting these lesions since it allows for the visualization of the encephalocele and its meningeal covering as well as the bone defect and associated lesions in the temporal lobes

  8. Music genre classification using temporal domain features

    Science.gov (United States)

    Shiu, Yu; Kuo, C.-C. Jay

    2004-10-01

    Music genre provides an efficient way to index songs in the music database, and can be used as an effective means to retrieval music of a similar type, i.e. content-based music retrieval. In addition to other features, the temporal domain features of a music signal are exploited so as to increase the classification rate in this research. Three temporal techniques are examined in depth. First, the hidden Markov model (HMM) is used to emulate the time-varying properties of music signals. Second, to further increase the classification rate, we propose another feature set that focuses on the residual part of music signals. Third, the overall classification rate is enhanced by classifying smaller segments from a test material individually and making decision via majority voting. Experimental results are given to demonstrate the performance of the proposed techniques.

  9. Tractable Pareto Optimization of Temporal Preferences

    Science.gov (United States)

    Morris, Robert; Morris, Paul; Khatib, Lina; Venable, Brent

    2003-01-01

    This paper focuses on temporal constraint problems where the objective is to optimize a set of local preferences for when events occur. In previous work, a subclass of these problems has been formalized as a generalization of Temporal CSPs, and a tractable strategy for optimization has been proposed, where global optimality is defined as maximizing the minimum of the component preference values. This criterion for optimality, which we call 'Weakest Link Optimization' (WLO), is known to have limited practical usefulness because solutions are compared only on the basis of their worst value; thus, there is no requirement to improve the other values. To address this limitation, we introduce a new algorithm that re-applies WLO iteratively in a way that leads to improvement of all the values. We show the value of this strategy by proving that, with suitable preference functions, the resulting solutions are Pareto Optimal.

  10. Modern temporal network theory: a colloquium

    Science.gov (United States)

    Holme, Petter

    2015-09-01

    The power of any kind of network approach lies in the ability to simplify a complex system so that one can better understand its function as a whole. Sometimes it is beneficial, however, to include more information than in a simple graph of only nodes and links. Adding information about times of interactions can make predictions and mechanistic understanding more accurate. The drawback, however, is that there are not so many methods available, partly because temporal networks is a relatively young field, partly because it is more difficult to develop such methods compared to for static networks. In this colloquium, we review the methods to analyze and model temporal networks and processes taking place on them, focusing mainly on the last three years. This includes the spreading of infectious disease, opinions, rumors, in social networks; information packets in computer networks; various types of signaling in biology, and more. We also discuss future directions.

  11. Temporal Segmentation of MPEG Video Streams

    Directory of Open Access Journals (Sweden)

    Janko Calic

    2002-06-01

    Full Text Available Many algorithms for temporal video partitioning rely on the analysis of uncompressed video features. Since the information relevant to the partitioning process can be extracted directly from the MPEG compressed stream, higher efficiency can be achieved utilizing information from the MPEG compressed domain. This paper introduces a real-time algorithm for scene change detection that analyses the statistics of the macroblock features extracted directly from the MPEG stream. A method for extraction of the continuous frame difference that transforms the 3D video stream into a 1D curve is presented. This transform is then further employed to extract temporal units within the analysed video sequence. Results of computer simulations are reported.

  12. Statistical methods for spatio-temporal systems

    CERN Document Server

    Finkenstadt, Barbel

    2006-01-01

    Statistical Methods for Spatio-Temporal Systems presents current statistical research issues on spatio-temporal data modeling and will promote advances in research and a greater understanding between the mechanistic and the statistical modeling communities.Contributed by leading researchers in the field, each self-contained chapter starts with an introduction of the topic and progresses to recent research results. Presenting specific examples of epidemic data of bovine tuberculosis, gastroenteric disease, and the U.K. foot-and-mouth outbreak, the first chapter uses stochastic models, such as point process models, to provide the probabilistic backbone that facilitates statistical inference from data. The next chapter discusses the critical issue of modeling random growth objects in diverse biological systems, such as bacteria colonies, tumors, and plant populations. The subsequent chapter examines data transformation tools using examples from ecology and air quality data, followed by a chapter on space-time co...

  13. The shifting temporalities of online news

    DEFF Research Database (Denmark)

    Bødker, Henrik; Brügger, Niels

    2018-01-01

    websites (as well as other characteristics of online archives), the construction of the empirical base stands in a complex relation to the analytical framework applied. As much as the article is a historical analysis of the temporality of online news, it, thus, also offers a range of methodological......As much as news websites news can be characterised by speed and immediacy, they are also recognisable online periodicals, which accumulate preceding news items. This is, as with the constitution of time in general, linked to relations between change and continuity. This article aims to understand...... consequently employs a framework for webpage analysis that primarily focuses on the syntactical level where temporalities emerge as relations between textual elements that change at very different intervals. This framework is applied to examples from the different stages of The Guardian’s webpage from 1996...

  14. Temporal quadratic expansion nodal Green's function method

    International Nuclear Information System (INIS)

    Liu Cong; Jing Xingqing; Xu Xiaolin

    2000-01-01

    A new approach is presented to efficiently solve the three-dimensional space-time reactor dynamics equation which overcomes the disadvantages of current methods. In the Temporal Quadratic Expansion Nodal Green's Function Method (TQE/NGFM), the Quadratic Expansion Method (QEM) is used for the temporal solution with the Nodal Green's Function Method (NGFM) employed for the spatial solution. Test calculational results using TQE/NGFM show that its time step size can be 5-20 times larger than that of the Fully Implicit Method (FIM) for similar precision. Additionally, the spatial mesh size with NGFM can be nearly 20 times larger than that using the finite difference method. So, TQE/NGFM is proved to be an efficient reactor dynamics analysis method

  15. Evaluating Temporal Consistency in Marine Biodiversity Hotspots.

    Science.gov (United States)

    Piacenza, Susan E; Thurman, Lindsey L; Barner, Allison K; Benkwitt, Cassandra E; Boersma, Kate S; Cerny-Chipman, Elizabeth B; Ingeman, Kurt E; Kindinger, Tye L; Lindsley, Amy J; Nelson, Jake; Reimer, Jessica N; Rowe, Jennifer C; Shen, Chenchen; Thompson, Kevin A; Heppell, Selina S

    2015-01-01

    With the ongoing crisis of biodiversity loss and limited resources for conservation, the concept of biodiversity hotspots has been useful in determining conservation priority areas. However, there has been limited research into how temporal variability in biodiversity may influence conservation area prioritization. To address this information gap, we present an approach to evaluate the temporal consistency of biodiversity hotspots in large marine ecosystems. Using a large scale, public monitoring dataset collected over an eight year period off the US Pacific Coast, we developed a methodological approach for avoiding biases associated with hotspot delineation. We aggregated benthic fish species data from research trawls and calculated mean hotspot thresholds for fish species richness and Shannon's diversity indices over the eight year dataset. We used a spatial frequency distribution method to assign hotspot designations to the grid cells annually. We found no areas containing consistently high biodiversity through the entire study period based on the mean thresholds, and no grid cell was designated as a hotspot for greater than 50% of the time-series. To test if our approach was sensitive to sampling effort and the geographic extent of the survey, we followed a similar routine for the northern region of the survey area. Our finding of low consistency in benthic fish biodiversity hotspots over time was upheld, regardless of biodiversity metric used, whether thresholds were calculated per year or across all years, or the spatial extent for which we calculated thresholds and identified hotspots. Our results suggest that static measures of benthic fish biodiversity off the US West Coast are insufficient for identification of hotspots and that long-term data are required to appropriately identify patterns of high temporal variability in biodiversity for these highly mobile taxa. Given that ecological communities are responding to a changing climate and other

  16. [Turbulence and spatio-temporal chaos

    International Nuclear Information System (INIS)

    1990-01-01

    This report discusses Saffman-Taylor instability; cylinder wake; Levy walk and turbulent channel flow; bubble motion and bubble streams; spinal turbulent and wetting; collective behavior of a coupled map system with a conserved quantity; stability of temporally periodic states; generic nonergodic behavior in continuous systems; characterization of unstable periodic orbits; in low-dimensional chaotic attractors and repellers; and Ginzburg-Landau theory for oil-water-surfactant mixture

  17. Management of Temporal Constraints for Factory Scheduling.

    Science.gov (United States)

    1987-06-01

    consistency of scheduling decisions were implemented in both the ISIS [Fox 84] and SOJA [LePape 85a] scheduling systems. More recent work with the...kinds of time propagation systems: the symbolic and the numeric ones. Symbolic systems combine relationships with a temporal logic a la Allen [Allen 81...maintains consistency by narrowing time windows associated with activities as decisions are made, and SOJA [LePape 85b] guarantees a schedule’s

  18. Human Plague Risk: Spatial-Temporal Models

    Science.gov (United States)

    Pinzon, Jorge E.

    2010-01-01

    This chpater reviews the use of spatial-temporal models in identifying potential risks of plague outbreaks into the human population. Using earth observations by satellites remote sensing there has been a systematic analysis and mapping of the close coupling between the vectors of the disease and climate variability. The overall result is that incidence of plague is correlated to positive El Nino/Southem Oscillation (ENSO).

  19. Measuring temporal turnover in ecological communities

    OpenAIRE

    Shimadzu, Hideyasu; Dornelas, Maria; Magurran, Anne

    2015-01-01

    The authors acknowledge support from the European Research Council (project BioTIME 250189) and the Royal Society. MD acknowledges funding from the Marine Alliance for Science and Technology Scotland (MASTS). MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. 1.Range migrations in response to climate change, invasive species and the emergence of novel ecosystems highlight the importance of temporal turnover in community composition as a...

  20. Optimal Temporal Policies in Fluid Milk Advertising

    OpenAIRE

    Vande Kamp, Philip R.; Kaiser, Harry M.

    1998-01-01

    This study develops an approach to obtain optimal temporal advertising strategies when consumers' response to advertising is asymmetric. Using this approach, optimal strategies for generic fluid milk advertising in New York City are determined. Results indicate that pulsed advertising policies are significantly more effective in increasing demand than a uniform advertising policy. Sensitivity analyses show that the optimal advertising policies are insensitive to reasonable variations in inter...

  1. Giant osteoblastoma of temporal bone: case report

    Directory of Open Access Journals (Sweden)

    FIGUEIREDO EBERVAL GADELHA

    1998-01-01

    Full Text Available Benign osteoblastoma is an uncommon bone tumor accounting for approximately 1% of all bone tumors. There are only 35 cases of skull osteoblastoma reported in the literature. We describe the case of a 23 year old male with a giant osteoblastoma of temporal bone submitted to a total removal of the tumor after an effective embolization of all external carotid branches. The authors discuss diagnostic and management aspects of this uncommon skull tumor.

  2. Linear Temporal Logic-based Mission Planning

    OpenAIRE

    Anil Kumar; Rahul Kala

    2016-01-01

    In this paper, we describe the Linear Temporal Logic-based reactive motion planning. We address the problem of motion planning for mobile robots, wherein the goal specification of planning is given in complex environments. The desired task specification may consist of complex behaviors of the robot, including specifications for environment constraints, need of task optimality, obstacle avoidance, rescue specifications, surveillance specifications, safety specifications, etc. We use Linear Tem...

  3. Nonmonotonic Reasoning as a Temporal Activity

    OpenAIRE

    Schwartz, Daniel G.

    2014-01-01

    A {\\it dynamic reasoning system} (DRS) is an adaptation of a conventional formal logical system that explicitly portrays reasoning as a temporal activity, with each extralogical input to the system and each inference rule application being viewed as occurring at a distinct time step. Every DRS incorporates some well-defined logic together with a controller that serves to guide the reasoning process in response to user inputs. Logics are generic, whereas controllers are application-specific. E...

  4. Spatially and temporally explicit water footprint accounting

    OpenAIRE

    Mekonnen, Mesfin

    2011-01-01

    The earth’s freshwater resources are subject to increasing pressure in the form of consumptive water use and pollution (Postel, 2000; WWAP, 2003, 2006, 2009). Quantitative assessment of the green, blue and grey water footprint of global production and consumption can be regarded as a key in understanding the pressure put on the global freshwater resources. The overall objective of this thesis is, therefore, to analyse the spatial and temporal pattern of the water footprint of humans from both...

  5. 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

  6. Temporal lobe volume predicts Wada memory test performance in patients with mesial temporal sclerosis.

    Science.gov (United States)

    Ding, Kan; Gong, Yunhua; Modur, Pradeep N; Diaz-Arrastia, Ramon; Agostini, Mark; Gupta, Puneet; McColl, Roderick; Hays, Ryan; Van Ness, Paul

    2016-02-01

    The Wada test is widely used in the presurgical evaluation of potential temporal lobectomy patients to predict postoperative memory function. Expected asymmetry (EA), defined as Wada memory lateralized to the nonsurgical hemisphere, or a higher score after injection of the surgical hemisphere would be considered favorable in terms of postoperative memory outcome. However, in some cases, nonlateralized memory (NM) results, with no appreciable asymmetry, may occur because of impaired scores after both injections, often leading to denial of surgery. The reason for such nonlateralized Wada memory in patients with intractable temporal lobe epilepsy (TLE) remains unclear. Given that quantitative morphometric magnetic resonance imaging studies in TLE patients have shown bilateral regional atrophy in temporal and extratemporal structures, we hypothesized that the volume loss in contralateral temporal structures could contribute to nonlateralized Wada memory performance. To investigate this, we examined the relationship between the volume changes of temporal structures and Wada memory scores in patients with intractable TLE with mesial temporal sclerosis (MTS) using an age- and gender-matched control group. Memory was considered nonlateralized if the absolute difference in the total correct recall scores between ipsilateral and contralateral injections was memory was lateralized in 15 and nonlateralized in 6 patients, with all the nonlateralized scores being observed in left TLE. The recall scores after ipsilateral injection were significantly lower in patients with an NM profile than an EA profile (23 ± 14% vs. 59 ± 18% correct recall, p ≤ 0.001). However, the recall scores after contralateral injection were low but similar between the two groups (25 ± 17% vs. 25 ± 15% correct recall, p=0.97). Compared to controls, all the patients showed greater volume loss in the temporal regions. However, patients with a NM profile showed significantly more volume loss than those

  7. Random walk centrality for temporal networks

    International Nuclear Information System (INIS)

    Rocha, Luis E C; Masuda, Naoki

    2014-01-01

    Nodes can be ranked according to their relative importance within a network. Ranking algorithms based on random walks are particularly useful because they connect topological and diffusive properties of the network. Previous methods based on random walks, for example the PageRank, have focused on static structures. However, several realistic networks are indeed dynamic, meaning that their structure changes in time. In this paper, we propose a centrality measure for temporal networks based on random walks under periodic boundary conditions that we call TempoRank. It is known that, in static networks, the stationary density of the random walk is proportional to the degree or the strength of a node. In contrast, we find that, in temporal networks, the stationary density is proportional to the in-strength of the so-called effective network, a weighted and directed network explicitly constructed from the original sequence of transition matrices. The stationary density also depends on the sojourn probability q, which regulates the tendency of the walker to stay in the node, and on the temporal resolution of the data. We apply our method to human interaction networks and show that although it is important for a node to be connected to another node with many random walkers (one of the principles of the PageRank) at the right moment, this effect is negligible in practice when the time order of link activation is included. (paper)

  8. Random walk centrality for temporal networks

    Science.gov (United States)

    Rocha, Luis E. C.; Masuda, Naoki

    2014-06-01

    Nodes can be ranked according to their relative importance within a network. Ranking algorithms based on random walks are particularly useful because they connect topological and diffusive properties of the network. Previous methods based on random walks, for example the PageRank, have focused on static structures. However, several realistic networks are indeed dynamic, meaning that their structure changes in time. In this paper, we propose a centrality measure for temporal networks based on random walks under periodic boundary conditions that we call TempoRank. It is known that, in static networks, the stationary density of the random walk is proportional to the degree or the strength of a node. In contrast, we find that, in temporal networks, the stationary density is proportional to the in-strength of the so-called effective network, a weighted and directed network explicitly constructed from the original sequence of transition matrices. The stationary density also depends on the sojourn probability q, which regulates the tendency of the walker to stay in the node, and on the temporal resolution of the data. We apply our method to human interaction networks and show that although it is important for a node to be connected to another node with many random walkers (one of the principles of the PageRank) at the right moment, this effect is negligible in practice when the time order of link activation is included.

  9. Losing the beat: deficits in temporal coordination

    Science.gov (United States)

    Palmer, Caroline; Lidji, Pascale; Peretz, Isabelle

    2014-01-01

    Tapping or clapping to an auditory beat, an easy task for most individuals, reveals precise temporal synchronization with auditory patterns such as music, even in the presence of temporal fluctuations. Most models of beat-tracking rely on the theoretical concept of pulse: a perceived regular beat generated by an internal oscillation that forms the foundation of entrainment abilities. Although tapping to the beat is a natural sensorimotor activity for most individuals, not everyone can track an auditory beat. Recently, the case of Mathieu was documented (Phillips-Silver et al. 2011 Neuropsychologia 49, 961–969. (doi:10.1016/j.neuropsychologia.2011.02.002)). Mathieu presented himself as having difficulty following a beat and exhibited synchronization failures. We examined beat-tracking in normal control participants, Mathieu, and a second beat-deaf individual, who tapped with an auditory metronome in which unpredictable perturbations were introduced to disrupt entrainment. Both beat-deaf cases exhibited failures in error correction in response to the perturbation task while exhibiting normal spontaneous motor tempi (in the absence of an auditory stimulus), supporting a deficit specific to perception–action coupling. A damped harmonic oscillator model was applied to the temporal adaptation responses; the model's parameters of relaxation time and endogenous frequency accounted for differences between the beat-deaf cases as well as the control group individuals. PMID:25385783

  10. CT of temporal bone - IV. inner ear

    International Nuclear Information System (INIS)

    Kwon, Jae Yoon; Sung, Kyu Bo; Youn, Eun Kyoung; Park, Youn Kyeung; Lee, Young Uk

    1990-01-01

    Temporal bone CT was done in 697 patients from April 1985 to October 1989. The abnormal findings were seen in 453 patients, which were chronic otitis media in 355 patients, fracture in 49 patients and congenital anomaly in 44 patients, etc. The abnormal findings of inner ear were observed on 46 patients. The results were summarized as follows : 1. The incidence of inner ear involvement by chronic otitis media was 7.3% (26/355 : labyrinthine fistula in 17 patients, labyrinthitis ossificans in 9 patients). Labyrinthine fistula was most commonly located on lateral semicircular canal (15/17, 88.2%). 2. Fusion of vestibule with lateral semicircular canal and formation of common cavity was demonstrated incidentally in 5 patients (0.7% of total number of temporal bone CT), and bilateral in 3 patients. 3. The incidence of inner ear anomaly in congenital ear anomaly was 11.4% (5/44). All cases were bilateral and three patients showed associated middle ear anomaly. 4. The incidence of involvement of bony labyrinth in temporal bone fracture was 10.2% (5/49). Labyrinthine fracture was seen all patients of transverse(3) and mixed fracture(1). In longitudinal fracture, labyrinthine fracture was seen in 2.2% (1/45). 5. Others were traumatic labyrinthitis ossificans(1), intracanalicular acoustic neuroma(3) and facial nerve neuroma(1)

  11. Positive autobiographical memory retrieval reduces temporal discounting

    Science.gov (United States)

    Lempert, Karolina M; Speer, Megan E; Delgado, Mauricio R

    2017-01-01

    Abstract People generally prefer rewards sooner rather than later. This phenomenon, temporal discounting, underlies many societal problems, including addiction and obesity. One way to reduce temporal discounting is to imagine positive future experiences. Since there is overlap in the neural circuitry associated with imagining future experiences and remembering past events, here we investigate whether recalling positive memories can also promote more patient choice. We found that participants were more patient after retrieving positive autobiographical memories, but not when they recalled negative memories. Moreover, individuals were more impulsive after imagining novel positive scenes that were not related to their memories, showing that positive imagery alone does not drive this effect. Activity in the striatum and temporo parietal junction during memory retrieval predicted more patient choice, suggesting that to the extent that memory recall is rewarding and involves perspective-taking, it influences decision-making. Furthermore, representational similarity in the ventromedial prefrontal cortex between memory recall and decision phases correlated with the behavioral effect across participants. Thus, we have identified a novel manipulation for reducing temporal discounting—remembering the positive past—and have begun to characterize the psychological and neural mechanisms behind it. PMID:28655195

  12. Temporality and the torments of time.

    Science.gov (United States)

    Hinton, Ladson

    2015-06-01

    Immersion in time gives birth to consciousness, as well as conflict and torment. When human beings developed a sense of future, they also gained the ability to anticipate threats from nature or their fellow beings. They thereby created cultures that are bastions of survival, as well as places of poetry, art and religion where they could band together and reflect upon their common plight. The practice of psychoanalysis is in many ways a temporal process, a process of remembering, for owning and elaborating a past that gives us substance, thereby providing a basis for reflective consciousness. Stimulated by Freud's early writings, Lacan, Laplanche and their successors in particular have focussed extensively on time and psychoanalysis, and their views are a central point of this discussion. A substantial case study is offered that provides concrete examples of these perspectives. A multi-faceted view of temporality emerges, one that is more syncopated than linear or teleological. In conclusion, I will briefly discuss recent findings in the neuroscience of memory and 'time travel' that underpin contemporary psychoanalytic ideas in surprising ways. It is important to remember that acceptance of the contradictory nature of temporal experience can open space for increased freedom and playfulness. © 2015, The Society of Analytical Psychology.

  13. Spatio-Temporal Reasoning and Context Awareness

    Science.gov (United States)

    Guesgen, Hans W.; Marsland, Stephen

    Smart homes provide many research challenges, but some of the most interesting ones are in dealing with data that monitors human behaviour and that is inherently both spatial and temporal in nature. This means that context becomes all important: a person lying down in front of the fireplace could be perfectly normal behaviour if it was cold and the fire was on, but otherwise it is unusual. In this example, the context can include temporal resolution on various scales (it is winter and therefore probably cold, it is not nighttime when the person would be expected to be in bed rather than the living room) as well as spatial (the person is lying in front of the fireplace) and extra information such as whether or not the fire is lit. It could also include information about how they reached their current situation: if they went from standing to lying very suddenly there would be rather more cause for concern than if they first knelt down and then lowered themselves onto the floor. Representing all of these different temporal and spatial aspects together is a major challenge for smart home research. In this chapter we will provide an overview of some of the methodologies that can be used to deal with these problems. We will also outline our own research agenda in the Massey University Smart Environments (MUSE) group.

  14. Importance of individual events in temporal networks

    International Nuclear Information System (INIS)

    Takaguchi, Taro; Masuda, Naoki; Sato, Nobuo; Yano, Kazuo

    2012-01-01

    Records of time-stamped social interactions between pairs of individuals (e.g. face-to-face conversations, e-mail exchanges and phone calls) constitute a so-called temporal network. A remarkable difference between temporal networks and conventional static networks is that time-stamped events rather than links are the unit elements generating the collective behavior of nodes. We propose an importance measure for single interaction events. By generalizing the concept of the advance of events proposed by Kossinets et al (2008 Proc. 14th ACM SIGKDD Int. Conf. on Knowledge Discovery and Data Mining p 435), we propose that an event is central when it carries new information about others to the two nodes involved in the event. We find that the proposed measure properly quantifies the importance of events in connecting nodes along time-ordered paths. Because of strong heterogeneity in the importance of events present in real data, a small fraction of highly important events is necessary and sufficient to sustain the connectivity of temporal networks. Nevertheless, in contrast to the behavior of scale-free networks against link removal, this property mainly results from bursty activity patterns and not heterogeneous degree distributions. (paper)

  15. Positive autobiographical memory retrieval reduces temporal discounting.

    Science.gov (United States)

    Lempert, Karolina M; Speer, Megan E; Delgado, Mauricio R; Phelps, Elizabeth A

    2017-10-01

    People generally prefer rewards sooner rather than later. This phenomenon, temporal discounting, underlies many societal problems, including addiction and obesity. One way to reduce temporal discounting is to imagine positive future experiences. Since there is overlap in the neural circuitry associated with imagining future experiences and remembering past events, here we investigate whether recalling positive memories can also promote more patient choice. We found that participants were more patient after retrieving positive autobiographical memories, but not when they recalled negative memories. Moreover, individuals were more impulsive after imagining novel positive scenes that were not related to their memories, showing that positive imagery alone does not drive this effect. Activity in the striatum and temporo parietal junction during memory retrieval predicted more patient choice, suggesting that to the extent that memory recall is rewarding and involves perspective-taking, it influences decision-making. Furthermore, representational similarity in the ventromedial prefrontal cortex between memory recall and decision phases correlated with the behavioral effect across participants. Thus, we have identified a novel manipulation for reducing temporal discounting-remembering the positive past-and have begun to characterize the psychological and neural mechanisms behind it. © The Author (2017). Published by Oxford University Press.

  16. Kernel Temporal Differences for Neural Decoding

    Science.gov (United States)

    Bae, Jihye; Sanchez Giraldo, Luis G.; Pohlmeyer, Eric A.; Francis, Joseph T.; Sanchez, Justin C.; Príncipe, José C.

    2015-01-01

    We study the feasibility and capability of the kernel temporal difference (KTD)(λ) algorithm for neural decoding. KTD(λ) is an online, kernel-based learning algorithm, which has been introduced to estimate value functions in reinforcement learning. This algorithm combines kernel-based representations with the temporal difference approach to learning. One of our key observations is that by using strictly positive definite kernels, algorithm's convergence can be guaranteed for policy evaluation. The algorithm's nonlinear functional approximation capabilities are shown in both simulations of policy evaluation and neural decoding problems (policy improvement). KTD can handle high-dimensional neural states containing spatial-temporal information at a reasonable computational complexity allowing real-time applications. When the algorithm seeks a proper mapping between a monkey's neural states and desired positions of a computer cursor or a robot arm, in both open-loop and closed-loop experiments, it can effectively learn the neural state to action mapping. Finally, a visualization of the coadaptation process between the decoder and the subject shows the algorithm's capabilities in reinforcement learning brain machine interfaces. PMID:25866504

  17. CT-diagnosis of temporal bone trauma

    Energy Technology Data Exchange (ETDEWEB)

    Valavanis, A.; Stuckmann, G.; Antonucci, F.; Schubiger, O.

    1986-02-01

    73 patients with 78 fractures of the temporal bone were examined by high-resolution computed tomography (CT). Analysis of the CT-findings disclosed 55 longitudinal, 12 transverse, 8 combined and 3 atypical fractures. For determination of the fracture type, axial sections usually proved sufficient. However, for precise topographic analysis of the course of the fracture additional coronal sections were necessary in most of the cases. In the radiologic evaluation of temporal bone fractures detection of associated. Complications is clinically important since these can be surgically corrected. In this series 20 lesions of the ossicular chain were demonstrated by the combined performance of axial and coronal sections and sagittal reformations. High resolution CT demonstrated a lesion of the facial nerve canal in 79% of a patient group with traumatic facial nerve palsy. The most frequent site of injury of the facial nerve canal was the region of the geniculate ganglion. With the use of metrizaminde-CT-cisternography the site of cerebrospinal fluid leakage was demonstrated in 7 of 9 patients with liquorrhea. It is concluded that high-resolution CT is the radiologic method of choice for both topographic evaluation of temporal bone fractures and detection and precise localization of fracture-complications. (orig.).

  18. Transcendence, historicity and temporality of being elderly: nursing reflection-using Heidegger.

    Science.gov (United States)

    Guerrero-Castañeda, Raúl Fernando; Prado, Marta Lenise do; Kempfer, Silvana Silveira; Vargas, Maria Guadalupe Ojeda

    2017-01-01

    The objective is to reflect on historicity and temporality as paths for the transcendence of being elderly, based on the phenomenological concepts of Martin Heiddeger. A review of the concepts of transcendence, historicity and temporality was carried out in the work of Martín Heidegger, integrating them in the perspective of nursing for the elderly. The transcendence of the elderly adult is feasible by accessing the temporality of self in the path of its historicity to arrive at the understanding of itself that he has achieved: transcending, which is but a process of the Being itself. Being is time in itself existing in the world, existence given by the encounter of the past (to have been), present and future (becoming), the same encounter that determines the historicity of the Being. The encounter has been consummated and the Being is transcendence, with the understanding of the Being itself as a supreme point. RESUMEN El objetivo es reflexionar en la historicidad y temporalidad como caminos para la trascendencia del ser adulto mayor, basado en los conceptos fenomenológicos de Martín Heiddeger. Se llevó a cabo una revisión de los conceptos de trascendencia, historicidad y temporalidad en la obra de Martín Heidegger, realizando su integración en la perspectiva de enfermería al adulto mayor. La trascendencia del ser adulto mayor es factible accediendo a la temporalidad del mismo en el camino de su historicidad para llegar a la comprensión de sí a la que ha llegado: trascendiendo, que no es sino un proceso del mismo ser. El ser es el tiempo en sí mismo existiendo en el mundo, existencia dada por el encuentro del pasado (haber sido), presente y futuro (devenir), mismo encuentro que determina la historicidad del ser. El encuentro se ha consumado y el ser es trascendencia, como punto supremo la comprensión del ser mismo.

  19. Spatio-temporal patterns of coral recruitment at Vamizi Island ...

    African Journals Online (AJOL)

    Spatio-temporal patterns of coral recruitment at Vamizi Island, Quirimbas Archipelago, Mozambique. ... Spatial and temporal patterns of recruitment of reef corals were assessed for the first time in Mozambique ... AJOL African Journals Online.

  20. Isolating Exogenous and Endogenous Modes of Temporal Attention

    Science.gov (United States)

    Lawrence, Michael A.; Klein, Raymond M.

    2013-01-01

    The differential allocation of information processing resources over time, here termed "temporal attention," may be achieved by relatively automatic "exogenous" or controlled "endogenous" mechanisms. Over 100 years of research has confounded these theoretically distinct dimensions of temporal attention. The current…

  1. Aplicaci??n de los SIG para determinar la variabilidad espacial de par??metros de calidad del mosto de uva. Experiencia en la D.O. Bierzo

    OpenAIRE

    Rodr??guez P??rez, Jos?? Ram??n, 1968-; ??lvarez Taboada, Mar??a Flor; Peters, Stefan

    2008-01-01

    Los estudios tradicionales sobre par??metros de calidad del mosto abarcan grandes bloques de vi??edo y se centran en determinar la evoluci??n temporal de estas variables para decidir la ??poca de vendimia m??s adecuada. En este trabajo se propone una metodolog??a para el an??lisis de la variabilidad espacial de los par??metros del mosto y se exponen los resultados obtenidos en la DO Bierzo, para cuatro variedades diferentes de vid. Los resultados permiten identificar zonas homogeneas en cuant...

  2. Determinantes de la temporalidad en el mercado laboral ecuatoriano || Determinants of Temporality in Ecuadorian Labor Market

    Directory of Open Access Journals (Sweden)

    Chávez, Yannira

    2012-01-01

    Full Text Available Las diferencias que existen dentro del mercado laboral ecuatoriano, en las diferentes ramas de actividad, evidencian los niveles de formación que los trabajadores deben tener para evitar efectos negativos. Por tal motivo, en este estudio se analiza el papel que las características personales, laborales y geográficas desempeñan en la probabilidad de obtener un contrato temporal frente a uno indefinido. El análisis es realizado por rama de actividad, para determinar qué características posibilitarán la existencia del contrato temporal en cada una de ellas. Para lograr este objetivo, se estiman modelos de regresión logística utilizando los datos de la Encuesta de Empleo, Desempleo y Subempleo desde el 2º trimestre del año 2007 al 2º trimestre del año 2010, elaborada por el Instituto Nacional de Estadística y Censos (INEC. || The differences that exist inside the labor Ecuadorian market, in the different branches of activity, demonstrate the training levels that the workers must have to avoid negative effects. However, in this study, the role played by individual, jobs and residence characteristics are analyzed on the probability of having a fixed-term employment versus permanent employment. It is analyzed concretely by branch of activity, to check which are the characteristics that would make it possible the existence of the fixed-term employment in each of them. To achieve this aim, there are estimated models of logistic regression using the information of the Survey of Employment, Unemployment and Underemployment from 2nd quarter of 2007 to the 2nd quarter of 2010, elaborated by the National Institute of Statistics and Censuses (INEC.

  3. Perfil neuropsicológico em doentes com epilepsia do lobo temporal

    Directory of Open Access Journals (Sweden)

    Daniela Marques

    2013-01-01

    Full Text Available A epilepsia do lobo temporal (ELT é o tipo de epilepsia refractária mais comum nos adultos. Existe um consenso quanto ao compromisso da memória na ELT com esclerose hipocampal. Contudo, no que respeita a outras funções como é o caso da atenção, funções executivas, rendimento intelectual e linguagem, o consenso não é tão generalizado. Para este estudo analisámos retrospectivamente um grupo de 76 doentes com epilepsia refractária, 48 doentes com epilepsia do lobo temporal (23 com lateralização à direita e 25 com lateralização à esquerda e 28 doentes com epilepsia extratemporal. Aplicámos uma batería de provas utilizada no âmbito do programa da Cirurgia da Epilepsia do Hospital de Egas Moniz em Lisboa, Portugal. Os resultados mostram que a bateria aplicada apresenta consistência interna no âmbito da avaliação dos doentes com ELT. Encontrámos que os doentes com ELT apresentam um padrão generalizados de défices, o que pode ser indicativo de compromisso noutras áreas, para além do hipocampo. Um achado que consideramos pertinente foi o facto da memória verbal com interferência (memoria a longo termo se manter adequada, sugerindo que esta função não está comprometida na ELT. Em suma, para além do padrão generalizado de défices cognitivos, também conseguimos observar o impacto da doença ao nível das variáveis sociodemográficas, assim como establecer uma relação com os achados neurobiológicos anteriormente descritos na literatura.

  4. TRABALHAR PARA ESTUDAR / ESTUDAR PARA TRABALHAR: REALIDADE E POSSIBILIDADES

    Directory of Open Access Journals (Sweden)

    Janes Siqueira

    2011-07-01

    Full Text Available O trabalho que apresentamos é parte da pesquisa com os estudantes das licenciaturas e da pedagogia da Universidade de Santa Cruz do Sul-UNISC-RS-Brasil. Este está inserido na linha de pesquisa: educação, trabalho e emancipação. Queremos compreender, à luz do materialismo histórico e dialético e das categorias da crítica da economia política, os significados atribuídos pelos estudantes universitários ao fenômeno trabalho e estudo. É uma pesquisa preferentemente qualitativa de natureza dialética. Para Marx, a essência da realidade humana reside no trabalho, mas a fonte de toda a riqueza está na natureza. Logo, trabalho, natureza e sociedade estão em relação dialética. Trabalho, portanto, é a ideia central articuladora, e natureza e sociedade devem ser estudadas em conexão com o trabalho. Marx trata o trabalho, no modo de produção capitalista, como impedimento ao desenvolvimento humano. Propõe o mesmo como um ato de criação e auto-expressão humana que não deve ter um valor. A compreensão dessa premissa é necessária para que os trabalhadores possam significar e ressignificar o trabalho para além da ideologia dominante. Algumas categorias aparecem como relevantes para a análise: condições de trabalho e de estudo, necessidade de formação, predominância do trabalho sobre o estudo, dificuldade de conciliar tempo de estudo e de trabalho. Na relação com o objeto de estudo, ressaltaremos a crise estrutural do capital, a desregulamentação das leis do trabalho e sua flexibilização e as contradições entre trabalho e estudo bem como quais possibilidades emancipatórias são visualizadas ou sonhadas pelos trabalhadores-estudantes. PALAVRAS-CHAVE: contradições entre trabalho e educação, condições e significados, realidade e possibilidades.

  5. TX-Kw: An Effective Temporal XML Keyword Search

    OpenAIRE

    Rasha Bin-Thalab; Neamat El-Tazi; Mohamed E.El-Sharkawi

    2013-01-01

    Inspired by the great success of information retrieval (IR) style keyword search on the web, keyword search on XML has emerged recently. Existing methods cannot resolve challenges addressed by using keyword search in Temporal XML documents. We propose a way to evaluate temporal keyword search queries over Temporal XML documents. Moreover, we propose a new ranking method based on the time-aware IR ranking methods to rank temporal keyword search queries results. Extensive experiments have been ...

  6. Estrategia didáctica para el perfeccionamiento del proceso de enseñanza-aprendizaje acelerado del idioma inglés en los cursos básicos para profesionales de la salud

    OpenAIRE

    Sanchez Morales, Dinorah Sofia

    2008-01-01

    La necesidad de cumplir convenios de cooperación en servicios de asistencia médica en países anglófonos ha impuesto a los docentes de postgrado del ISCMVC la tarea de cambiar los paradigmas que rigen en el país para el aprendizaje del idioma inglés en profesionales de la salud. Se estableció un sistema de cursos para lograr la aceleración del aprendizaje en el adulto, sustentado metodologicamente sobre tres dimensiones específicas: la sicológica, la temporal y la espacial, proyectadas dentro ...

  7. Sound improves diminished visual temporal sensitivity in schizophrenia

    NARCIS (Netherlands)

    de Boer-Schellekens, L.; Stekelenburg, J.J.; Maes, J.P.; van Gool, A.R.; Vroomen, J.

    2014-01-01

    Visual temporal processing and multisensory integration (MSI) of sound and vision were examined in individuals with schizophrenia using a visual temporal order judgment (TOJ) task. Compared to a non-psychiatric control group, persons with schizophrenia were less sensitive judging the temporal order

  8. Temporal Preparation and Inhibitory Deficit in Fibromyalgia Syndrome

    Science.gov (United States)

    Correa, Angel; Miro, Elena; Martinez, M. Pilar; Sanchez, Ana I.; Lupianez, Juan

    2011-01-01

    Cognitive deficits in fibromyalgia may be specifically related to controlled processes, such as those measured by working memory or executive function tasks. This hypothesis was tested here by measuring controlled temporal preparation (temporal orienting) during a response inhibition (go no-go) task. Temporal orienting effects (faster reaction…

  9. A Rare Case of Craniopharyngioma in the Temporal Lobe

    Directory of Open Access Journals (Sweden)

    Sasan Razmjoo

    2017-01-01

    Full Text Available Herein, we report on a rare case of craniopharyngioma arising in the left temporal lobe with no prior history of head trauma or surgery. There was a solid-cystic mass in the left temporal lobe on MR images. To the best of our knowledge, this is the second case of a craniopharyngioma occurring in the temporal lobe.

  10. How Would You Like to Aggregate Your Temporal Data?

    DEFF Research Database (Denmark)

    Böhlen, M. H.; Gamper, J.; Jensen, Christian Søndergaard

    2006-01-01

    concepts, and it discusses the abilities of five approaches to the design of temporal query languages with respect to temporal aggregation. Rather than providing focused, polished results, the paper?s aim is to explore the inherent support for temporal aggregation in an informal manner that may serve...

  11. Spectro-temporal modulation masking patterns reveal frequency selectivity.

    Science.gov (United States)

    Oetjen, Arne; Verhey, Jesko L

    2015-02-01

    The present study investigated the possibility that the human auditory system demonstrates frequency selectivity to spectro-temporal amplitude modulations. Threshold modulation depth for detecting sinusoidal spectro-temporal modulations was measured using a generalized masked threshold pattern paradigm with narrowband masker modulations. Four target spectro-temporal modulations were examined, differing in their temporal and spectral modulation frequencies: a temporal modulation of -8, 8, or 16 Hz combined with a spectral modulation of 1 cycle/octave and a temporal modulation of 4 Hz combined with a spectral modulation of 0.5 cycles/octave. The temporal center frequencies of the masker modulation ranged from 0.25 to 4 times the target temporal modulation. The spectral masker-modulation center-frequencies were 0, 0.5, 1, 1.5, and 2 times the target spectral modulation. For all target modulations, the pattern of average thresholds for the eight normal-hearing listeners was consistent with the hypothesis of a spectro-temporal modulation filter. Such a pattern of modulation-frequency sensitivity was predicted on the basis of psychoacoustical data for purely temporal amplitude modulations and purely spectral amplitude modulations. An analysis of separability indicates that, for the present data set, selectivity in the spectro-temporal modulation domain can be described by a combination of a purely spectral and a purely temporal modulation filter function.

  12. Temporal analysis of text data using latent variable models

    DEFF Research Database (Denmark)

    Mølgaard, Lasse Lohilahti; Larsen, Jan; Goutte, Cyril

    2009-01-01

    Detecting and tracking of temporal data is an important task in multiple applications. In this paper we study temporal text mining methods for Music Information Retrieval. We compare two ways of detecting the temporal latent semantics of a corpus extracted from Wikipedia, using a stepwise...

  13. A numerical comparison between the spatially-growing and temporally-growing disturbance in a pipe

    Energy Technology Data Exchange (ETDEWEB)

    Pacheco, Rafael J. [Universidad de Guanajuato, Guanajuato (Mexico); Pacheco Vega, Arturo [University of Nortre Dame, IN (United States); Pacheco Vega, H. Raul [University of British Columbia, Vancouver (Canada)

    2001-08-01

    The linear stability of Poiseuille flow in a pipe is examined for the infinitesimal disturbances propagating in both, time and space. The numerical procedure for obtaining the eigenvalues of the linear problem and its adjoint is based on the spectral collocation method with shifted Chebyshev polynomials. The Fredholm alternative is then applied to determine the group velocity. We show that the temporal damping rates of axisymmetric infinitesimal perturbations are related to those in space by the group velocity in accord with the theory first developed by Gaster. [Spanish] Se examina la estabilidad lineal del flujo de Poiseuille en una tuberia para perturbaciones infinitesimales que se propagan en el tiempo y el espacio. El proceso numerico para obtener los valores caracteristicos del problema lineal y su adjunto se basa en el metodo espectral de colocacion con los polinomios de Chebyshev. La teoria de la alternativa de Fredholm se aplica a la determinacion de la velocidad de grupo. Se demuestra que las razones de decaimiento para las perturbaciones axisimetrias infinitesimales temporales estan relacionadas con las espaciales mediante la velocidad de grupo, de acuerdo con la teoria presentada por primera vez por Gaster.

  14. Resolução temporal de crianças escolares Temporal resolution of young students

    Directory of Open Access Journals (Sweden)

    Sheila Andreoli Balen

    2009-01-01

    Full Text Available OBJETIVO: estudar a resolução temporal de crianças com desenvolvimento normal no teste de detecção de intervalos de silêncio (Random gap detection - RGDT e no teste de detecção do intervalo no ruído (Gaps-in-noise - GIN. MÉTODOS: a população foi composta por 73 crianças escolares, sendo selecionadas 19 com desenvolvimento normal, na faixa etária de seis a 14 anos, de ambos os sexos, ausência de histórico otológico e/ou audiológico e de queixas escolares; audição normal; produção articulatória de todos os sons do Português e sem distúrbios do processamento auditivo. Os procedimentos da pesquisa foram os testes RGDT e GIN, realizados a 50 dB NS sendo o primeiro apresentado binaural e o segundo monoauralmente. Para análise dos dados foi aplicado teste t de Student. RESULTADOS: no teste RGDT, a média dos intervalos de silêncio para as freqüências de 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz foram respectivamente, 10,13 ms; 8,69 ms; 11,94 ms; 10,56 ms, não ocorrendo diferenças estatisticamente significantes em relação à freqüência testada. No teste GIN, a média do limiar foi de 5,7 ms para a orelha direita e 5,4 ms para a orelha esquerda, não havendo diferença estatisticamente significante quanto à orelha avaliada. CONCLUSÃO: há evidências de diferenças dos limiares dos testes, o que aponta a hipótese de que GIN e RGDT não estejam avaliando a mesma habilidade auditiva ou requisitem processos não auditivos nas tarefas solicitadas. Desta forma, são necessárias novas pesquisas para entender melhor a aplicabilidade e os parâmetros de ambos os testes na prática clínica no Brasil.PURPOSE: to study temporal processing in children with normal development through the Random Gap Detection Test and the Gaps-in-noise Test. METHODS: a population comprised of 73 students, 19 having normal development, between 6 and 14-year old, males and females, no otologic and/or audiologic history, and no learning disabilities

  15. AIDS e grau de escolaridade no Brasil: evolução temporal de 1986 a 1996

    Directory of Open Access Journals (Sweden)

    Maria Goretti Fonseca

    Full Text Available Este trabalho analisa a evolução temporal dos casos de AIDS por grau de escolaridade como variável identificadora do nível sócio-econômico do caso. Todos os casos de AIDS em indivíduos com idades entre 20 e 69 anos, notificados até 29 de maio de 1999, diagnosticados entre 1986 e 1996, foram incluídos no estudo. As taxas de incidência para ambos os sexos foram calculadas segundo dois graus de escolaridade - "grau 1" (casos com até oito anos de estudo e "grau 2" (com mais de oito anos de estudo -, por região e ano de diagnóstico. Entre os homens, as taxas de incidência de AIDS para aqueles com menor escolaridade ultrapassam (sendo mais evidente na Região Sudeste ou se aproximam das taxas dos homens com maior escolaridade. Para as mulheres, a evolução temporal das taxas mostrou maior ritmo de crescimento entre as mulheres de menor escolaridade para todas as regiões, sendo que, na Sudeste, as taxas entre as mulheres com menor escolaridade ultrapassa as taxas daquelas com maior escolaridade em anos anteriores a 1989. Concluindo, a presente análise mostra, de forma consistente, que a epidemia de AIDS no Brasil se iniciou nos estratos sociais de maior escolaridade, com progressiva disseminação para os estratos sociais de menor escolaridade.

  16. La protección se queda corta: el nuevo programa de migración de Perú para los venezolanos

    OpenAIRE

    Parent, Nicolas

    2017-01-01

    La introducción en Perú de un nuevo permiso de trabajo y de estudio para los venezolanos que huyen de la violencia en su país es algo encomiable, pero solo aporta una forma de protección limitada y temporal.

  17. Spatio-temporal analysis of forest modeling in Mexico

    Directory of Open Access Journals (Sweden)

    Saira Y. Martínez-Santiago

    2017-01-01

    Full Text Available Hay consenso de que las acciones antropogénicas están degradando los ecosistemas a un ritmo alarmante. La modelación y las nuevas tecnologías, como las tecnologías de la información y de la comunicación ( TIC, se utilizan en modo creciente para tomar decisiones sobre el manejo y la conservación de los recursos naturales. En este trabajo se analizaron la evolución temporal y la distribución espacial de la producción científica en modelación forestal en México. De 1980 a 2015, 454 autores participaron en la publicación de 259 artículos en 37 revistas (84 % mexicanas, de las cuales 28 están indizadas en el Journal Citation Reports (JCR. Los trabajos sobre manejo forestal han sido los más relevantes, aunque tienen una importancia relativa a la baja, mientras que los de servicios ambientales y distribución potencial van ganando importancia. Los autores pertenecen a 89 instituciones, de las cuales 65 % son mexicanas. Durante el periodo analizado, el número de autores (y las colaboraciones y publicaciones incrementaron 12 y nueve veces, respectivamente. Estos incrementos coinciden con la evolución de las políticas normativas y el establecimiento y apoyo del Sistema Nacional de Investigadores. Las colaboraciones en la red actual de modelación forestal aún tienen gran potencial de crecimiento.

  18. SPATIAL AND TEMPORAL VARIATION OF NITROGEN IN THE MEDELLIN RIVER

    Directory of Open Access Journals (Sweden)

    LINA CLAUDIA GIRALDO

    2010-01-01

    Full Text Available El nitrógeno es un elemento biogénico constituyente de moléculas orgánicas que desempeñan funciones vitales para toda célula [1]. Su origen proviene de la mineralización de la materia orgánica, de la disolución de rocas sedimentarias y del intercambio con el nitrógeno gaseoso¿ es por ello que un incremento de materia orgánica proveniente de fuentes domésticas, agrícolas e industriales, eleva las concentraciones de nitrógeno, que aunque es un nutriente esencial, en concentraciones elevadas genera efectos nocivos a la biota acuática, y por tanto se desequilibra un ecosistema. En este artículo se hace un análisis de la variación espacial de las formas de nitrógeno: amoniacal, nitritos y nitratos en el perfil del río Medellín, buscando entender los fenómenos asociados a sus transformaciones. Así mismo, un análisis temporal a partir de información recolectada desde el año 1973 de diferentes estudios fisicoquímicos realizados en el río. Finalmente, se correlaciona el crecimiento de población y los usos del suelo con las concentraciones de nitrógeno, tratando de explicar estas últimas como un producto de la interacción del hombre con la naturaleza y los procesos de ocupación.

  19. Automatización de un sistema de inmersión temporal con base en plataformas abiertas de hardware y software

    Directory of Open Access Journals (Sweden)

    Oziel Lugo Espinosa

    2017-07-01

    Full Text Available Un Sistema de Inmersión Temporal (SIT permite la micropropagación de plantas en ambientes esterilizados y herméticos; sin embargo, es una tecnología complicada y costosa. En este trabajo, se presenta una alternativa de automatización con base en plataformas abiertas de hardware y software, con los objetivos de reducir costos y aumentar las prestaciones frente a sistemas comerciales, mediante la reconfiguración por software de rutinas para la aplicación de nutrientes, monitoreo constante y control a distancia del sistema. Para el desarrollo del hardware se utilizó la metodología Bottom Up, y para el software, la metodología Kanban. El sistema propuesto tiene un costo promedio de un 10% en comparación con dispositivos electrónicos comerciales utilizados en la industria para resolver problemas de automatización de procesos. Sin embargo, es necesario una evaluación de crecimiento de los explantes para corroborar las ventajas competitivas del prototipo equiparadas a los sistemas tradicionales de inmersión temporal.

  20. Recursos forestales para la vivienda

    Directory of Open Access Journals (Sweden)

    Olga Elgueta A.

    1984-06-01

    Full Text Available En una visita a la Universidad del Bío-Bío, realizada por el arquitecto peruano Cristián Arbaiza, dio a conocer detalladamente cuáles fueron los propósitos que tuvo el Pacto Andino -del cual es funcionario- para ocuparse de la forestación tropical y su relación con la vivienda, aspectos considerados fundamentales en el estudio de soluciones que permitan paliar el grave déficit habitacional que afecta a los países que componen el grupo subregional andino.

  1. Condiciones para el aprendizaje organizacional

    OpenAIRE

    Delio Ignacio Castañeda

    2015-01-01

    El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compa˜nías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conv...

  2. Entre velos: Maya para contrabajo

    OpenAIRE

    Rosa María Rodríguez Hernández

    2014-01-01

    Maya para contrabajo se materializa a partir de una imagen de Pepe Romero, cuyo texto interpreta a La decadencia de la mentira de Oscar Wilde. La estructura de Maya es binaria, especular y asimétrica; su poética obedece al juego verdad/mentira que subyace en la obra artística y en la vivencia del artista. Maya trae a la memoria las voces de los Upanishad, Schopenhauer, Shakespeare y Beethoven, influencias éstas en la obra de Wagner y, todas ellas, en la de Eliot. Los aspectos gestuales y visu...

  3. Temporal lobe epilepsy with mesial temporal sclerosis: hippocampal neuronal loss as a predictor of surgical outcome

    Directory of Open Access Journals (Sweden)

    Anaclara Prada Jardim

    2012-05-01

    Full Text Available OBJECTIVE: To analyze retrospectively a series of patients with temporal lobe epilepsy (TLE and mesial temporal sclerosis (MTS, and the association of patterns of hippocampal sclerosis with clinical data and surgical prognosis. METHOD: Sixty-six patients with medically refractory TLE with unilateral MTS after anterior temporal lobectomy were included. Quantitative neuropathological evaluation was performed on NeuN-stained hippocampal sections. Patient's clinical data and surgical outcome were reviewed. RESULTS: Occurrence of initial precipitating insult (IPI, as well as better postoperative seizure control (i.e. Engel class 1, were associated with classical and severe patterns of hippocampal sclerosis (MTS type 1a and 1b, respectively. CONCLUSION: Quantitative evaluation of hippocampal neuronal loss patterns predicts surgical outcome in patients with TLE-MTS.

  4. Temporal lobe epilepsy with mesial temporal sclerosis: hippocampal neuronal loss as a predictor of surgical outcome.

    Science.gov (United States)

    Jardim, Anaclara Prada; Neves, Rafael Scarpa da Costa; Caboclo, Luís Otávio Sales Ferreira; Lancellotti, Carmen Lucia Penteado; Marinho, Murilo Martinez; Centeno, Ricardo Silva; Cavalheiro, Esper Abrão; Scorza, Carla Alessandra; Yacubian, Elza Márcia Targas

    2012-05-01

    To analyze retrospectively a series of patients with temporal lobe epilepsy (TLE) and mesial temporal sclerosis (MTS), and the association of patterns of hippocampal sclerosis with clinical data and surgical prognosis. Sixty-six patients with medically refractory TLE with unilateral MTS after anterior temporal lobectomy were included. Quantitative neuropathological evaluation was performed on NeuN-stained hippocampal sections. Patient's clinical data and surgical outcome were reviewed. Occurrence of initial precipitating insult (IPI), as well as better postoperative seizure control (i.e. Engel class 1), were associated with classical and severe patterns of hippocampal sclerosis (MTS type 1a and 1b, respectively). Quantitative evaluation of hippocampal neuronal loss patterns predicts surgical outcome in patients with TLE-MTS.

  5. Magnetic resonance imaging in temporal lobe epilepsy. Usefulness for the etiological diagnosis of temporal lobe epilepsy

    International Nuclear Information System (INIS)

    Mohamed, A.; Lueders, H.O.

    2000-01-01

    With improvement in magnetic resonance (MR) imaging techniques, the ability to identify lesions responsible for temporal lobe epilepsy has increased. MR imaging has also enabled the in vivo diagnosis of hippocampal sclerosis. Brain tumors are responsible for 2-4% of epilepsies in adult population and 10-20% of medically intractable epilepsy. The sensitivity of MR imaging in the diagnosis of tumors and other lesions of the temporal lobe (vascular malformations, etc.) is around 90%. Both hippocampal sclerosis and other temporal lobe lesions are amenable to surgical therapy with excellent postsurgical seizure outcome. In this article, we characterize and underline distinguishing features of the different pathological entities. We also suggest an approach to reviewing the MR images of an epileptic patient. (author)

  6. Factores que influyen en la dispersión espacio-temporal de broca del café #Hypothenemus hampei# (Coleoptera: Curculionidae)

    OpenAIRE

    Roman Ruiz, Ariana Karina

    2017-01-01

    La broca del café, Hypothenemus hampei (Ferrari), es la plaga más importante del café, Coffea spp., en el mundo. Este insecto ha sido motivo de numerosos estudios, sin embargo, muchos aspectos de su dispersión se desconocen o requieren ser determinados. La presente investigación tuvo el objetivo de estudiar los factores que influyen en la dispersión espacio-temporal de la broca del café. Dado que la dispersión es un proceso complejo, para ser estudiada se desarrollaron técnicas para la obtenc...

  7. General Temporal Knowledge for Planning and Data Mining

    Science.gov (United States)

    Morris, Robert; Khatib, Lina

    2001-01-01

    We consider the architecture of systems that combine temporal planning and plan execution and introduce a layer of temporal reasoning that potential1y improves both the communication between humans and such systems, and the performance of the temporal planner itself. In particular, this additional layer simultaneously supports more flexibility in specifying and maintaining temporal constraints on plans within an uncertain and changing execution environment, and the ability to understand and trace the progress of plan execution. It is shown how a representation based on single set of abstractions of temporal information can be used to characterize the reasoning underlying plan generation and execution interpretation. The complexity of such reasoning is discussed.

  8. Markup of temporal information in electronic health records.

    Science.gov (United States)

    Hyun, Sookyung; Bakken, Suzanne; Johnson, Stephen B

    2006-01-01

    Temporal information plays a critical role in the understanding of clinical narrative (i.e., free text). We developed a representation for marking up temporal information in a narrative, consisting of five elements: 1) reference point, 2) direction, 3) number, 4) time unit, and 5) pattern. We identified 254 temporal expressions from 50 discharge summaries and represented them using our scheme. The overall inter-rater reliability among raters applying the representation model was 75 percent agreement. The model can contribute to temporal reasoning in computer systems for decision support, data mining, and process and outcomes analyses by providing structured temporal information.

  9. Selective amygdalohippocampectomy via trans-superior temporal gyrus keyhole approach.

    Science.gov (United States)

    Mathon, Bertrand; Clemenceau, Stéphane

    2016-04-01

    Hippocampal sclerosis is the most common cause of drug-resistant epilepsy amenable for surgical treatment and seizure control. The rationale of the selective amygdalohippocampectomy is to spare cerebral tissue not included in the seizure generator. Describe the selective amygdalohippocampectomy through the trans-superior temporal gyrus keyhole approach. Selective amygdalohippocampectomy for temporal lobe epilepsy is performed when the data (semiology, neuroimaging, electroencephalography) point to the mesial temporal structures. The trans-superior temporal gyrus keyhole approach is a minimally invasive and safe technique that allows disconnection of the temporal stem and resection of temporomesial structures.

  10. Spike voltage topography in temporal lobe epilepsy.

    Science.gov (United States)

    Asadi-Pooya, Ali A; Asadollahi, Marjan; Shimamoto, Shoichi; Lorenzo, Matthew; Sperling, Michael R

    2016-07-15

    We investigated the voltage topography of interictal spikes in patients with temporal lobe epilepsy (TLE) to see whether topography was related to etiology for TLE. Adults with TLE, who had epilepsy surgery for drug-resistant seizures from 2011 until 2014 at Jefferson Comprehensive Epilepsy Center were selected. Two groups of patients were studied: patients with mesial temporal sclerosis (MTS) on MRI and those with other MRI findings. The voltage topography maps of the interictal spikes at the peak were created using BESA software. We classified the interictal spikes as polar, basal, lateral, or others. Thirty-four patients were studied, from which the characteristics of 340 spikes were investigated. The most common type of spike orientation was others (186 spikes; 54.7%), followed by lateral (146; 42.9%), polar (5; 1.5%), and basal (3; 0.9%). Characteristics of the voltage topography maps of the spikes between the two groups of patients were somewhat different. Five spikes in patients with MTS had polar orientation, but none of the spikes in patients with other MRI findings had polar orientation (odds ratio=6.98, 95% confidence interval=0.38 to 127.38; p=0.07). Scalp topographic mapping of interictal spikes has the potential to offer different information than visual inspection alone. The present results do not allow an immediate clinical application of our findings; however, detecting a polar spike in a patient with TLE may increase the possibility of mesial temporal sclerosis as the underlying etiology. Copyright © 2016 Elsevier B.V. All rights reserved.

  11. The temporal scaling of Caenorhabditis elegans ageing.

    Science.gov (United States)

    Stroustrup, Nicholas; Anthony, Winston E; Nash, Zachary M; Gowda, Vivek; Gomez, Adam; López-Moyado, Isaac F; Apfeld, Javier; Fontana, Walter

    2016-02-04

    The process of ageing makes death increasingly likely, involving a random aspect that produces a wide distribution of lifespan even in homogeneous populations. The study of this stochastic behaviour may link molecular mechanisms to the ageing process that determines lifespan. Here, by collecting high-precision mortality statistics from large populations, we observe that interventions as diverse as changes in diet, temperature, exposure to oxidative stress, and disruption of genes including the heat shock factor hsf-1, the hypoxia-inducible factor hif-1, and the insulin/IGF-1 pathway components daf-2, age-1, and daf-16 all alter lifespan distributions by an apparent stretching or shrinking of time. To produce such temporal scaling, each intervention must alter to the same extent throughout adult life all physiological determinants of the risk of death. Organismic ageing in Caenorhabditis elegans therefore appears to involve aspects of physiology that respond in concert to a diverse set of interventions. In this way, temporal scaling identifies a novel state variable, r(t), that governs the risk of death and whose average decay dynamics involves a single effective rate constant of ageing, kr. Interventions that produce temporal scaling influence lifespan exclusively by altering kr. Such interventions, when applied transiently even in early adulthood, temporarily alter kr with an attendant transient increase or decrease in the rate of change in r and a permanent effect on remaining lifespan. The existence of an organismal ageing dynamics that is invariant across genetic and environmental contexts provides the basis for a new, quantitative framework for evaluating the manner and extent to which specific molecular processes contribute to the aspect of ageing that determines lifespan.

  12. The temporal scaling of Caenorhabditis elegans ageing

    Science.gov (United States)

    Stroustrup, Nicholas; Anthony, Winston E.; Nash, Zachary M.; Gowda, Vivek; Gomez, Adam; López-Moyado, Isaac F.; Apfeld, Javier; Fontana, Walter

    2016-02-01

    The process of ageing makes death increasingly likely, involving a random aspect that produces a wide distribution of lifespan even in homogeneous populations. The study of this stochastic behaviour may link molecular mechanisms to the ageing process that determines lifespan. Here, by collecting high-precision mortality statistics from large populations, we observe that interventions as diverse as changes in diet, temperature, exposure to oxidative stress, and disruption of genes including the heat shock factor hsf-1, the hypoxia-inducible factor hif-1, and the insulin/IGF-1 pathway components daf-2, age-1, and daf-16 all alter lifespan distributions by an apparent stretching or shrinking of time. To produce such temporal scaling, each intervention must alter to the same extent throughout adult life all physiological determinants of the risk of death. Organismic ageing in Caenorhabditis elegans therefore appears to involve aspects of physiology that respond in concert to a diverse set of interventions. In this way, temporal scaling identifies a novel state variable, r(t), that governs the risk of death and whose average decay dynamics involves a single effective rate constant of ageing, kr. Interventions that produce temporal scaling influence lifespan exclusively by altering kr. Such interventions, when applied transiently even in early adulthood, temporarily alter kr with an attendant transient increase or decrease in the rate of change in r and a permanent effect on remaining lifespan. The existence of an organismal ageing dynamics that is invariant across genetic and environmental contexts provides the basis for a new, quantitative framework for evaluating the manner and extent to which specific molecular processes contribute to the aspect of ageing that determines lifespan.

  13. Banco de dientes: una alternativa para la rehabilitación de dientes temporales anterosuperiores

    Directory of Open Access Journals (Sweden)

    Débora Vasconcelos Pereira

    1997-12-01

    Full Text Available Existe una gran necesidad de rehabilitar el sector anterosuperior en pacientes con dentición temporal destruida por caries o traumatismos para reestablecer su función y estética y mejorar el perfil psicológico del niño. Se presenta la técnica de reposición de coronas y fragmentos para la reconstrucción de dientes temporales anterosuperiores a partir de un banco de dientes, realizada en la disciplina de odontopediatría de la Facultad de Odontología, en la Universidad de Sao Paulo. Se presentan diferentes indicaciones de esta técnica, para rehabilitación de coronas y fragmentos dentarios en el sector anterosuperior en la dentición temporal. El tiempo de seguimiento clínico radiográfico promedio fue de 6 meses, período en el cual se observaron excelentes resultados en relación con la estética, retención, resistencia y función, lo que demostró una alternativa de restauración en pacientes con destrucciones precoces en dientes temporales anterosuperiores.There is a great need to rehabilitate the anterosuperior sector in patients with temporal teething destroyed by caries or traumatisms so as to reestablish its function and aesthetics and to improve the psychological profile of the child. It is presented the technique of replacement of crowns and fragments for the reconstruction of temporal anterosuperior teeth starting from a tooth bank. This technique is applied within the discipline of odontopediatrics at the Faculty of Odontology, in the University of Sao Paulo. Different indications for the rehabilitation of crowns and dental fragments in the anterosuperior sector of temporal teething are shown. The average time of the clinical and radiological follow-up was 6 months. During this period, excellent results in connection with aesthetics, retention, resistance, and function were observed, which demonstrated that it is an alternative of restoration for patients with early destructions of temporal anterosuperior teeth.

  14. Hipometabolismo cerebral em pacientes com esclerose mesial temporal demonstrado pelo FDG-PET Brain hypometabolism in patients with mesial-temporal sclerosis demonstrated by FDG-PET

    Directory of Open Access Journals (Sweden)

    PAULO S. DUARTE

    2000-09-01

    Full Text Available O objetivo deste estudo foi avaliar a extensão do hipometabolismo cerebral em pacientes com esclerose mesial temporal (EMT. MÉTODO: Este estudo retrospectivo incluiu 21 pacientes que apresentavam epilepsia parcial complexa refrataria à terapia e que foram selecionados para cirurgia após análise extensa que incluía: EEG de superfície e estudos de neuroimagem (PET, SPECT e ressonância magnética. Todos os pacientes foram submetidos a intervenção cirúrgica e tiveram confirmação histológica de EMT. Uma análise semi-quantitativa foi realizada, utilizando regiões de interesse (ROIs nas seguintes estruturas: lobos frontais, parietais e occipitais, gânglios da base, tálamos, cerebelo e três diferentes regiões nos lobos temporais, que compreendiam o córtex medial, inferior e lateral. Um índice de assimetria (IA foi calculado, comparando as contagens por pixel nas estruturas homólogas em ambos os hemisférios cerebrais. Os IAs das diferentes estruturas foram então correlacionados. RESULTADOS: Uma correlação significativa foi demonstrada entre os IAs do córtex medial dos lobos temporais e aqueles dos lobos frontais, dos lobos parietais, dos gânglios da base e dos tálamos (r = 0,72, 0,62, 0,47 e 0,47 respectivamente com p The purpose of this study was to evaluate the extent of brain hypometabolism in patients with mesial-temporal sclerosis (MTS. METHOD: This retrospective study included 21 patients who had medically refractory complex partial seizures and were selected for surgical therapy after a comprehensive evaluation which included surface EEG recordings and neuroimaging studies (PET, SPECT and MRI. All patients were subjected to surgical intervention and had an histopathological confirmation of MTS. A semi-quantitative analysis of the PET images was performed using regions of interest in the following structures: frontal, parietal and occipital lobes, basal ganglia, thalami, cerebellum and three different regions in the

  15. Spatio temporal media components for neurofeedback

    DEFF Research Database (Denmark)

    Jensen, Camilla Birgitte Falk; Petersen, Michael Kai; Larsen, Jakob Eg

    2013-01-01

    A class of Brain Computer Interfaces (BCI) involves interfaces for neurofeedback training, where a user can learn to self-regulate brain activity based on real-time feedback. These particular interfaces are constructed from audio-visual components and temporal settings, which appear to have...... a strong influence on the ability to control brain activity. Therefore, identifying the different interface components and exploring their individual effects might be key for constructing new interfaces that support more efficient neurofeedback training. We discuss experiments involving two different...

  16. Temporal data mining for hospital management

    Science.gov (United States)

    Tsumoto, Shusaku; Hirano, Shoji

    2009-04-01

    It has passed about twenty years since clinical information are stored electronically as a hospital information system since 1980's. Stored data include from accounting information to laboratory data and even patient records are now started to be accumulated: in other words, a hospital cannot function without the information system, where almost all the pieces of medical information are stored as multimedia databases. In this paper, we applied temporal data mining and exploratory data analysis techniques to hospital management data. The results show several interesting results, which suggests that the reuse of stored data will give a powerful tool for hospial management.

  17. Temporal organization of cellular self-replication

    Science.gov (United States)

    Alexandrov, Victor; Pugatch, Rami

    Recent experiments demonstrate that single cells grow exponentially in time. A coarse grained model of cellular self-replication is presented based on a novel concept - the cell is viewed as a self-replicating queue. This allows to have a more fundamental look into various temporal organizations and, importantly, the inherent non-Markovianity of noise distributions. As an example, the distribution of doubling times can be inferred and compared to single cell experiments in bacteria. We observe data collapse upon scaling by the average doubling time for different environments and present an inherent task allocation trade-off. Support from the Simons Center for Systems Biology, IAS, Princeon.

  18. Spatio-temporal intermittency on the sandpile

    International Nuclear Information System (INIS)

    Erzan, A.; Sinha, S.

    1990-08-01

    The self-organized critical state exhibited by a sandpile model is shown to correspond to motion on an attractor characterized by an invariant distribution of the height variable. The largest Lyapunov exponent is equal to zero. The model nonetheless displays intermittent chaos, with a multifractal distribution of local expansion coefficients in history space. Laminar spatio-temporal regions are interrupted by chaotic bursts caused by avalanches. We introduce the concept of local histories in configuration space and show that their expansion parameters also exhibit a multifractal distribution in time and space. (author). 22 refs, 5 figs

  19. A Temporal Perspective on Organizational Identity

    DEFF Research Database (Denmark)

    Schultz, Majken; Hernes, Tor

    2013-01-01

    time perspective in the use of memory enabled a longer time perspective in formulating claims for future identity, (2) a broader scope of articulated identity claims for the future was related to the combination of a broader range of memory forms, and (3) the depth of claims for future identity...... was related to the way in which memory forms were combined. At a more general level, our paper illustrates how viewing identity construction from the perspective of an ongoing present adds a new dimension to understanding the temporal dynamics of organizational identity....

  20. The Models of Inter-temporal Consume

    Directory of Open Access Journals (Sweden)

    Nora Mihail

    2007-10-01

    Full Text Available The articol presents a category of consumption models which shows the manner how theexpenses of consume in an economy are related to the available income achieved by this economy and theinterest rate from the financial market. Since the income as well as the expenses of consume are realizedin time, such dynamic models of consume are also referred to as models of inter-temporal consume,emphasizing therefore the fact that the available income achieved at a certain moment may be used forconsume at a future moment, whereas the decision of consume taken at a current moment may consider theincome that is to be achieved in the future.

  1. Temporal super resolution using variational methods

    DEFF Research Database (Denmark)

    Keller, Sune Høgild; Lauze, Francois Bernard; Nielsen, Mads

    2010-01-01

    Temporal super resolution (TSR) is the ability to convert video from one frame rate to another and is as such a key functionality in modern video processing systems. A higher frame rate than what is recorded is desired for high frame rate displays, for super slow-motion, and for video/film format...... observed when watching video on large and bright displays where the motion of high contrast edges often seem jerky and unnatural. A novel motion compensated (MC) TSR algorithm using variational methods for both optical flow calculation and the actual new frame interpolation is presented. The flow...

  2. MEASURING TEMPORAL PHOTON BUNCHING IN BLACKBODY RADIATION

    Energy Technology Data Exchange (ETDEWEB)

    Tan, P. K.; Poh, H. S.; Kurtsiefer, C. [Center for Quantum Technologies, 3 Science Drive 2, 117543 (Singapore); Yeo, G. H.; Chan, A. H., E-mail: pengkian@physics.org, E-mail: phyck@nus.edu.sg [Department of Physics, National University of Singapore, 2 Science Drive 3, 117551 (Singapore)

    2014-07-01

    Light from thermal blackbody radiators such as stars exhibits photon bunching behavior at sufficiently short timescales. However, with available detector bandwidths, this bunching signal is difficult to observe directly. We present an experimental technique to increase the photon bunching signal in blackbody radiation via spectral filtering of the light source. Our measurements reveal strong temporal photon bunching from blackbody radiation, including the Sun. This technique allows for an absolute measurement of the photon bunching signature g {sup (2)}(0), and thereby a direct statement on the statistical nature of a light source. Such filtering techniques may help revive the interest in intensity interferometry as a tool in astronomy.

  3. Mesial temporal sclerosis in children Esclerose mesial temporal em crianças

    Directory of Open Access Journals (Sweden)

    Eliana Maria Domingues Brandão

    2007-12-01

    Full Text Available Mesial temporal sclerosis is the most frequent cause of drug-resistant temporal lobe epilepsy but has a satisfactory response to surgery, and is considered infrequent in children. OBJECTIVE: To evaluate the clinical, electrographic and radiological spectrum of the disease in children. METHOD: Retrospective study by review of charts of 44 children with a diagnosis of mesial temporal sclerosis on magnetic resonance imaging, attended at the "Hospital das Clínicas" of the University of São Paulo Faculty of Medicine. RESULTS: Febrile seizure was identified in the history of 54% of the patients. Injuries at the left side predominated in patients with schooling difficulties (p=0.049, in those with the first seizures between six months and five years (p=0.021 and in those with complex febrile seizure (p=0.032. Thirteen patients were submitted to surgery and of these, eight remained without seizures. CONCLUSION: Febrile seizure may be related in a more direct way to the presence of left-side mesial temporal sclerosis.Em adultos, esclerose mesial temporal é a causa mais freqüente de epilepsia do lobo temporal intratável por medicamentos e que responde satisfatoriamente a cirurgia, sendo considerada pouco freqüente em criança. OBJETIVO: Avaliar o espectro clínico, eletrográfico e radiológico desta patologia em crianças. MÉTODO: Estudo retrospectivo, por revisão de prontuário de 44 crianças com diagnóstico de esclerose mesial temporal na ressonância magnética, atendidos no Hospital das Clínicas da Faculdade de Medicina de São Paulo. RESULTADO: Foi identificado que 54% dos pacientes apresentaram antecedente de crise febril. Lesão no lado esquerdo predominou nos pacientes com dificuldade escolar (p=0.049, naqueles com primeiras crises entre seis meses e cinco anos (p=0,021 e naqueles com crise febril complicada (p=0,032. Treze pacientes foram operados, dos quais oito ficaram livres de crises. CONCLUSÃO: Crise febril pode estar

  4. 3D Printed Pediatric Temporal Bone: A Novel Training Model.

    Science.gov (United States)

    Longfield, Evan A; Brickman, Todd M; Jeyakumar, Anita

    2015-06-01

    Temporal bone dissection is a fundamental element of otologic training. Cadaveric temporal bones (CTB) are the gold standard surgical training model; however, many institutions do not have ready access to them and their cost can be significant: $300 to $500. Furthermore, pediatric cadaveric temporal bones are not readily available. Our objective is to develop a pediatric temporal bone model. Temporal bone model. Tertiary Children's Hospital. Pediatric patient model. We describe the novel use of a 3D printer for the generation of a plaster training model from a pediatric high- resolution CT temporal bone scan of a normal pediatric temporal bone. Three models were produced and were evaluated. The models utilized multiple colors (white for bone, yellow for the facial nerve) and were of high quality. Two models were drilled as a proof of concept and found to be an acceptable facsimile of the patient's anatomy, rendering all necessary surgical landmarks accurately. The only negative comments pertaining to the 3D printed temporal bone as a training model were the lack of variation in hardness between cortical and cancellous bone, noting a tactile variation from cadaveric temporal bones. Our novel pediatric 3D temporal bone training model is a viable, low-cost training option for previously inaccessible pediatric temporal bone training. Our hope is that, as 3D printers become commonplace, these models could be rapidly reproduced, allowing for trainees to print models of patients before performing surgery on the living patient.

  5. Pequenos para idade gestacional: fator de risco para mortalidade neonatal

    Directory of Open Access Journals (Sweden)

    Almeida Márcia Furquim de

    1998-01-01

    Full Text Available OBJETIVO: Estudar as variáveis contempladas na Declaração de Nascimento (DN como possíveis fatores de risco para nascimentos pequenos para a idade gestacional (PIG e o retardo de crescimento intra-uterino como fator de risco para a mortalidade neonatal. MATERIAL E MÉTODO: As variáveis existentes na DN foram obtidas diretamente de prontuários hospitalares. Os dados referem-se a uma coorte de nascimentos obtida por meio da vinculação das declarações de nascimento e óbito, correspondendo a 2.251 nascimentos vivos hospitalares, de mães residentes, ocorridos no Município de Santo André, Região Metropolitana de São Paulo, no período de l/1 a 30/6/1992, e aos óbitos neonatais verificados nessa coorte. RESULTADOS: Obteve-se a proporção de 4,3% de nascimentos PIG, significativamente maior entre os recém-nascidos de pré-termo e pós-termo, entre os nascimentos cujas mães tinham mais de 35 anos de idade e grau de instrução inferior ao primeiro grau completo. Os recém-nascidos PIG apresentam maior risco de morte neonatal que aqueles que não apresentavam sinais de retardo de crescimento intra-uterino. CONCLUSÕES: Em áreas com menor freqüência de baixo peso ao nascer, é importante investigar a presença de retardo de crescimento intra-uterino entre os nascimentos prematuros e não apenas nos nascimentos de termo. O registro da data da última menstruação (ou da idade gestacional em semanas não agregadas na DN facilitaria a detecção de PIGs na população de recém-nascidos.

  6. Para onde vai a Geografia?

    Directory of Open Access Journals (Sweden)

    Angélica Karina Dillenburg Horii

    2015-12-01

    Full Text Available O presente artigo aborda a evolução da Geografia enquanto pensamento científico, analisando seu objeto de estudo e suas categorias de análise durante todo o percurso da criação desse saber. Observa primeiramente a formação da Geografia Clássica, que teve seus princípios já instituídos na Antiguidade com Ptolomeu e Estrabão, desdobrando-se no período Iluminista com Ritter e Humboldt que fornecerão uma nova temporalidade a essa ciência. Atinge seu ápice na Modernidade Industrial com a racionalidade de Kant, onde Ratzel e La Blache utilizarão o determinismo e o possibilismo para constituir um discurso científico para a Geografia. Finaliza apontando a nova compreensão do mundo, conhecida como pós-modernismo por David Harvey (1992 ou por Milton Santos (1996 como Globalização, que junto a outros geógrafos e pesquisadores, indicam caminhos de análise dessa ciência na compreensão do seu objeto de estudo. Um diálogo entre os autores na construção do pensamento geográfico.

  7. Establishing a temporal bone laboratory: considerations for ENT specialist training.

    LENUS (Irish Health Repository)

    Fennessy, B G

    2012-02-01

    Cadaveric temporal bone dissection in a temporal bone laboratory is a vital component in training safe, competent otorhinolaryngologists. Recent controversies pertaining to organ retention have resulted in a more limited supply of temporal bones. Consequently, current trainees are dissecting far fewer bones than their consultants. We discuss the establishment of a temporal bone laboratory in the Department of Anatomy in the University College Cork, from the timely preparation and preservation of the tissue to its disposal. Comparisons are drawn between our experience and that of the United States training schemes. The temporal bone laboratory in Cork is the only one in existence in Ireland. The exposure and experience obtained by registrars rotating through Cork, has resulted in noticeable improvements in their operative abilities. The temporal bone laboratory remains a core component to training. It is hoped that this article may facilitate other units overcoming obstacles to establish a temporal bone laboratory.

  8. Crisis del lóbulo temporal registrada mediante magnetoencefalografía: caso clínico Temporal lobe seizure recorded by magnetoencephalography: case report

    Directory of Open Access Journals (Sweden)

    Carlos Amo

    2004-09-01

    Full Text Available La localización del inicio de las crisis es un factor importante para la evaluación prequirúrgica de la epilepsia. En este trabajo se describe la localización del inicio de una crisis registrada mediante magnetoencefalografía (MEG en un niño de 12 años que presenta crisis parciales complejas farmacorresistentes. La RM muestra una lesión de 20mm de diámetro en el hipocampo izquierdo. EEG de superficie con ondas theta temporales izquierdas. Registro MEG interictal con punta-onda aislada posterior e inferior a la lesión de la RM. Registro MEG ictal con punta-onda (2 Hz. La localización de los dipolos indica el inicio de la crisis en la circunvolución temporal inferior en la misma localización que la actividad interictal MEG. Esta actividad ictal se propaga bilateralmente a áreas frontales. El registro corticográfico intraquirúrgico confirma los resultados de la localización interictal mediante MEG.Ictal onset localization is a important factor in presurgical evaluation of epilepsy. This paper describes the localization of a seizure onset recorded by magnetoencephalography (MEG from a 12-year-old male patient who suffered from complex partial drug-resistant seizures. MRI revealed a 20mm diameter lesion located in left hippocampus. Scalp EEG showed left temporal theta waves. Interictal MEG registrations detected isolated spike-wave activity posterior and inferior to the MRI lesion. Ictal MEG showed continuous spike-wave activity (2 Hz. Dipole localization sited seizure onset in the inferior left temporal gyrus, the same localization of the interictal MEG activity. This ictal activity spreads bilaterally to frontal areas. Intrasurgical electrocorticography recording confirmed interictal MEG results.

  9. Infraestructura para laboratorios de acceso remoto

    Directory of Open Access Journals (Sweden)

    López Luro, Francisco

    2009-01-01

    Full Text Available Las tecnologías de Internet permiten el uso de sistemas de software distribuido para el acceso en forma remota a laboratorios físicos y virtuales, para llevar a cabo actividades de investigación experimental a distancia. A partir de los marcos teóricos que definen los estructurantes de los laboratorios, los implementadores de laboratorios de acceso remoto deben diseñar y desarrollar arquitecturas de servicios que permitan un acceso flexible y controlado. Este trabajo define una infraestructura para la implementación de aplicaciones para el acceso remoto a laboratorios físicos y virtuales y para la gestión de los mismos. Se presentan conceptos que permiten extender la modalidad tradicional de conexión con un dispositivo, para llevar adelante actividades prácticas de laboratorio colaborativas y concurrentes.

  10. Internet como instrumento para la Yihad

    Directory of Open Access Journals (Sweden)

    Alfonso Merlos García

    2006-01-01

    Full Text Available Las extraordinarias ventajas que ofrece Internet lo han convertido en un instrumento clave y dinámico en la estrategia de los yihadistas. Los medios de comunicación, la clase política y las agencias de seguridad e información han tendido a concentrar sus esfuerzos en la neutralización del ciberterrorismo sin prestar suficiente atención a los múltiples usos de Internet que están haciendo los neosalafistas: para la propaganda y para la guerra psicológica, para el reclutamiento y para la financiación, para la documentación y para la planificación de atentados. Las democracias deberían considerar el coste que tendrá la derrota frente al movimiento yihadista globalizado en la batalla por el ciberespacio

  11. Inteligencia Emocional para tiempos de crisis

    OpenAIRE

    Fernández-Berrocal, Pablo

    2014-01-01

    La Inteligencia Emocional se concibe como un conjunto de habilidades, tanto básicas como complejas, dirigidas a “unificar las emociones y el razonamiento”, esto es, usar las emociones para facilitar el razonamiento y los procesos de pensamiento, y usar nuestro razonamiento para pensar de forma inteligente acerca de nuestras emociones (Mayer y Salovey, 1997). En concreto, la IE se define como una habilidad mental que incluye “la capacidad para percibir, valorar y expresar las emociones con...

  12. Temporal encoding in a nervous system.

    Directory of Open Access Journals (Sweden)

    Zane N Aldworth

    2011-05-01

    Full Text Available We examined the extent to which temporal encoding may be implemented by single neurons in the cercal sensory system of the house cricket Acheta domesticus. We found that these neurons exhibit a greater-than-expected coding capacity, due in part to an increased precision in brief patterns of action potentials. We developed linear and non-linear models for decoding the activity of these neurons. We found that the stimuli associated with short-interval patterns of spikes (ISIs of 8 ms or less could be predicted better by second-order models as compared to linear models. Finally, we characterized the difference between these linear and second-order models in a low-dimensional subspace, and showed that modification of the linear models along only a few dimensions improved their predictive power to parity with the second order models. Together these results show that single neurons are capable of using temporal patterns of spikes as fundamental symbols in their neural code, and that they communicate specific stimulus distributions to subsequent neural structures.

  13. Unpredictable visual changes cause temporal memory averaging.

    Science.gov (United States)

    Ohyama, Junji; Watanabe, Katsumi

    2007-09-01

    Various factors influence the perceived timing of visual events. Yet, little is known about the ways in which transient visual stimuli affect the estimation of the timing of other visual events. In the present study, we examined how a sudden color change of an object would influence the remembered timing of another transient event. In each trial, subjects saw a green or red disk travel in circular motion. A visual flash (white frame) occurred at random times during the motion sequence. The color of the disk changed either at random times (unpredictable condition), at a fixed time relative to the motion sequence (predictable condition), or it did not change (no-change condition). The subjects' temporal memory of the visual flash in the predictable condition was as veridical as that in the no-change condition. In the unpredictable condition, however, the flash was reported to occur closer to the timing of the color change than actual timing. Thus, an unpredictable visual change distorts the temporal memory of another visual event such that the remembered moment of the event is closer to the timing of the unpredictable visual change.

  14. Temporal dynamics of divided spatial attention.

    Science.gov (United States)

    Itthipuripat, Sirawaj; Garcia, Javier O; Serences, John T

    2013-05-01

    In naturalistic settings, observers often have to monitor multiple objects dispersed throughout the visual scene. However, the degree to which spatial attention can be divided across spatially noncontiguous objects has long been debated, particularly when those objects are in close proximity. Moreover, the temporal dynamics of divided attention are unclear: is the process of dividing spatial attention gradual and continuous, or does it onset in a discrete manner? To address these issues, we recorded steady-state visual evoked potentials (SSVEPs) as subjects covertly monitored two flickering targets while ignoring an intervening distractor that flickered at a different frequency. All three stimuli were clustered within either the lower left or the lower right quadrant, and our dependent measure was SSVEP power at the target and distractor frequencies measured over time. In two experiments, we observed a temporally discrete increase in power for target- vs. distractor-evoked SSVEPs extending from ∼350 to 150 ms prior to correct (but not incorrect) responses. The divergence in SSVEP power immediately prior to a correct response suggests that spatial attention can be divided across noncontiguous locations, even when the targets are closely spaced within a single quadrant. In addition, the division of spatial attention appears to be relatively discrete, as opposed to slow and continuous. Finally, the predictive relationship between SSVEP power and behavior demonstrates that these neurophysiological measures of divided attention are meaningfully related to cognitive function.

  15. Adaptive temporal refinement in injection molding

    Science.gov (United States)

    Karyofylli, Violeta; Schmitz, Mauritius; Hopmann, Christian; Behr, Marek

    2018-05-01

    Mold filling is an injection molding stage of great significance, because many defects of the plastic components (e.g. weld lines, burrs or insufficient filling) can occur during this process step. Therefore, it plays an important role in determining the quality of the produced parts. Our goal is the temporal refinement in the vicinity of the evolving melt front, in the context of 4D simplex-type space-time grids [1, 2]. This novel discretization method has an inherent flexibility to employ completely unstructured meshes with varying levels of resolution both in spatial dimensions and in the time dimension, thus allowing the use of local time-stepping during the simulations. This can lead to a higher simulation precision, while preserving calculation efficiency. A 3D benchmark case, which concerns the filling of a plate-shaped geometry, is used for verifying our numerical approach [3]. The simulation results obtained with the fully unstructured space-time discretization are compared to those obtained with the standard space-time method and to Moldflow simulation results. This example also serves for providing reliable timing measurements and the efficiency aspects of the filling simulation of complex 3D molds while applying adaptive temporal refinement.

  16. Radiation injury to the temporal bone

    International Nuclear Information System (INIS)

    Guida, R.A.; Finn, D.G.; Buchalter, I.H.; Brookler, K.H.; Kimmelman, C.P.

    1990-01-01

    Osteoradionecrosis of the temporal bone is an unusual sequela of radiation therapy to the head and neck. Symptoms occur many years after the radiation is administered, and progression of the disease is insidious. Hearing loss (sensorineural, conductive, or mixed), otalgia, otorrhea, and even gross tissue extrusion herald this condition. Later, intracranial complications such as meningitis, temporal lobe or cerebellar abscess, and cranial neuropathies may occur. Reported here are five cases of this rare malady representing varying degrees of the disease process. They include a case of radiation-induced necrosis of the tympanic ring with persistent squamous debris in the external auditory canal and middle ear. Another case demonstrates the progression of radiation otitis media to mastoiditis with bony sequestration. Further progression of the disease process is seen in a third case that evolved into multiple cranial neuropathies from skull base destruction. Treatment includes systemic antibiotics, local wound care, and debridement in cases of localized tissue involvement. More extensive debridement with removal of sequestrations, abscess drainage, reconstruction with vascularized tissue from regional flaps, and mastoid obliteration may be warranted for severe cases. Hyperbaric oxygen therapy has provided limited benefit

  17. Temporal and spatial foliations of spacetimes.

    Science.gov (United States)

    Herold, H.

    For the solution of initial-value problems in numerical relativity usually the (3+1) splitting of Einstein's equations is employed. An important part of this splitting is the choice of the temporal gauge condition. In order to estimate the quality of time-evolution schemes, different time slicings of given well-known spherically symmetric spacetimes have been studied. Besides the maximal slicing condition the harmonic slicing prescription has been used to calculate temporal foliations of the Schwarzschild and the Oppenheimer-Snyder spacetime. Additionally, the author has studied a recently proposed, geometrically motivated spatial gauge condition, which is defined by considering the foliations of the three-dimensional space-like hypersurfaces by 2-surfaces of constant mean extrinsic curvature. Apart from the equations for the shift vector, which can be derived for this gauge condition, he has investigated such spatial foliations for well-known stationary axially symmetric spacetimes, namely for the Kerr metric and for numerically determined solutions for rapidly rotating neutron stars.

  18. Frontal lobe function in temporal lobe epilepsy

    Science.gov (United States)

    Stretton, J.; Thompson, P.J.

    2012-01-01

    Summary Temporal lobe epilepsy (TLE) is typically associated with long-term memory dysfunction. The frontal lobes support high-level cognition comprising executive skills and working memory that is vital for daily life functioning. Deficits in these functions have been increasingly reported in TLE. Evidence from both the neuropsychological and neuroimaging literature suggests both executive function and working memory are compromised in the presence of TLE. In relation to executive impairment, particular focus has been paid to set shifting as measured by the Wisconsin Card Sorting Task. Other discrete executive functions such as decision-making and theory of mind also appear vulnerable but have received little attention. With regard to working memory, the medial temporal lobe structures appear have a more critical role, but with emerging evidence of hippocampal dependent and independent processes. The relative role of underlying pathology and seizure spread is likely to have considerable bearing upon the cognitive phenotype and trajectory in TLE. The identification of the nature of frontal lobe dysfunction in TLE thus has important clinical implications for prognosis and surgical management. Longitudinal neuropsychological and neuroimaging studies assessing frontal lobe function in TLE patients pre- and postoperatively will improve our understanding further. PMID:22100147

  19. Temporal and spectral interaction in loudness perception

    Science.gov (United States)

    Pedersen, Benjamin; Ellermeier, Wolfgang

    2005-04-01

    An experiment was conducted to investigate how changes in spectral content influence loudness judgments. Six listeners were asked to discriminate sounds, which were of one second duration and changing in level every 0.1 s. In one condition the first half of the sound was low-pass filtered and the second half high-pass filtered. In a second condition the opposite order was used. In a third condition no filtering was applied and the frequency spectrum was simply white noise. The results were analyzed using a statistical method, which assigns relative weights to the ten temporal segments. In this way individual weighting curves were obtained for each condition. Listeners tended to emphasize the beginning of the sound in their loudness judgments. When the frequency spectrum changed in the middle of the sound, however, the weighting of the onset of the new spectral content was emphasized as well. This outcome is inconsistent with overall temporal integration, and argues for a cognitive mechanism allocating attention to changes in an event sequence.

  20. Temporal modulations in speech and music.

    Science.gov (United States)

    Ding, Nai; Patel, Aniruddh D; Chen, Lin; Butler, Henry; Luo, Cheng; Poeppel, David

    2017-10-01

    Speech and music have structured rhythms. Here we discuss a major acoustic correlate of spoken and musical rhythms, the slow (0.25-32Hz) temporal modulations in sound intensity and compare the modulation properties of speech and music. We analyze these modulations using over 25h of speech and over 39h of recordings of Western music. We show that the speech modulation spectrum is highly consistent across 9 languages (including languages with typologically different rhythmic characteristics). A different, but similarly consistent modulation spectrum is observed for music, including classical music played by single instruments of different types, symphonic, jazz, and rock. The temporal modulations of speech and music show broad but well-separated peaks around 5 and 2Hz, respectively. These acoustically dominant time scales may be intrinsic features of speech and music, a possibility which should be investigated using more culturally diverse samples in each domain. Distinct modulation timescales for speech and music could facilitate their perceptual analysis and its neural processing. Copyright © 2017 Elsevier Ltd. All rights reserved.