118 research outputs found

    Optimization of Tremblay's battery model parameters for plug-in hybrid electric vehicle application

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    Accurate modeling of batteries for plug-in hybrid vehicle applications is of fundamental importance to optimize the operation strategy, extend battery life and improve vehicle performance. Tremblay’s battery model has been specificallydesigned and validated for electric vehicle applications. Tremblay’s parameter identification method is based on evaluating the three remarkable points manually picked from a manufacturer’s discharge curve. This method is error prone and the resultant discharge curve may deviate significantly from the experimental curve as reported in previous studies. This paper proposes to use a novel quantum-behaved particle swarm optimization (QPSO) parameter estimation technique to estimate the model parameters. The performance of QPSO is compared to that of genetic algorithm (GA) and particle swarm optimization (PSO) approaches. The QPSO technique needs less tuning effort than other techniques since it only uses one tuning parameter. Reducing the number of iterations should be a welcome development in most applications areas. Results show that the QPSO parameter estimation technique converges to acceptable solutions with fewer iterations than that obtained by the GA and the PSO approaches

    Efectos inmediatos de la fibrolisis diacutánea en deportistas con dolor anterior en la rodilla

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    Introducción: el dolor anterior en la rodilla es un síntoma frecuente entre los deportistas. Puede tener múltiples causas incluido un desequilibrio muscular que puede determinar mal alineamiento o mayor presión femoropatelar. En la práctica clínica, se ha observado que la fibrolisis diacutánea proporciona buenos resultados en el tratamiento de estos pacientes. El objetivo del estudio es evaluar sus efectos sobre la distancia femoropatelar y sobre el dolor percibido en flexión de rodilla, en deportistas afectados de dolor anterior de rodilla. Material y método: estudio de intervención no controlado no aleatorizado, en deportistas con dolor anterior de la rodilla relacionado con la actividad deportiva. Se realizó una sesión de fibrolisis diacutánea y se evaluó, antes y después de la sesión, la distancia femoropatelar medida con ecografía y la intensidad de dolor (EVA) percibida en apoyo monopodal en posición de 90º de flexión de rodilla. Resultados: la media de edad de los participantes era 25,6 años (DE 6,36), 4 eran mujeres y 6 hombres. La intensidad de dolor (EVA) se redujo de 2,90 a 0,93 (p < 0,01). La distancia femoropatelar se incrementó significativamente en las tres referencias medidas: en el centro de la tróclea de 0,42 a 0,50 cm (p < 0,03), en la tróclea lateral de 0,22 a 0,31 cm (p < 0,02), y en la tróclea medial de 0,18 a 0,28 cm (p < 0,02). Discusión y conclusión: en la muestra de estudio, una sesión de fibrolisis diacutánea ha podido influir en la disminución de la intensidad del dolor y en el incremento de la distancia femoropatelar, lo que podría implicar una disminución de estrés sobre el cartílago probablemente por un mecanismo similar a los estiramientos musculares. La inmediatez de efectos observados aconseja utilizar fibrolisis diacutánea como coadyuvante del tratamiento conservador de estos pacientes

    PLK1 facilitates chromosome biorientation by suppressing centromere disintegration driven by BLM-mediated unwinding and spindle pulling

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    Centromeres provide a pivotal function for faithful chromosome segregation. They serve as a foundation for the assembly of the kinetochore complex and spindle connection, which is essential for chromosome biorientation. Cells lacking Polo-like kinase 1 (PLK1) activity suffer severe chromosome alignment defects, which is believed primarily due to unstable kinetochore-microtubule attachment. Here, we reveal a previously undescribed mechanism named ‘centromere disintegration’ that drives chromosome misalignment in PLK1-inactivated cells. We find that PLK1 inhibition does not necessarily compromise metaphase establishment, but instead its maintenance. We demonstrate that this is caused by unlawful unwinding of DNA by BLM helicase at a specific centromere domain underneath kinetochores. Under bipolar spindle pulling, the distorted centromeres are promptly decompacted into DNA threadlike molecules, leading to centromere rupture and whole-chromosome arm splitting. Consequently, chromosome alignment collapses. Our study unveils an unexpected role of PLK1 as a chromosome guardian to maintain centromere integrity for chromosome biorientation

    Overview of Land Use Transport Models

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    The previous chapters in this Handbook have shown that spatial development, or land use, determines the need for spatial interaction, or transport, but that transport, by the accessibility it provides, also determines spatial development. However, it is difficult to empirically isolate impacts of land use on transport and vice versa because of the multitude of concurrent changes of other factors. This poses a problem if the likely impacts of integrated land-use and transport policies to reduce the demand for travel are to be predicted. There are principally three methods to predict those impacts. The first is to ask people how they would change their location and mobility behaviour if certain factors, such as land use regulations or transport costs, would change (&apos;stated preference&apos;). The second consists of drawing conclusions from observed decision behaviour of people under different conditions on how they would be likely to behave if these factors would change (&apos;revealed preference&apos;). The third method is to simulate human decision behaviour in mathematical models. All three methods have their advantages and disadvantages. Surveys can reveal also subjective factors of location and mobility decisions, however, their respondents can only make conjec-tures about how they would behave in still unknown situations, and the validity of such con

    Congenital and childhood atrioventricular blocks: pathophysiology and contemporary management

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    Atrioventricular block is classified as congeni- tal if diagnosed in utero, at birth, or within the first month of life. The pathophysiological process is believed to be due to immune-mediated injury of the conduction system, which occurs as a result of transplacental pas- sage of maternal anti-SSA/Ro-SSB/La antibodies. Childhood atrioventricular block is therefore diagnosed between the first month and the 18th year of life. Genetic variants in multiple genes have been described to date in the pathogenesis of inherited progressive car- diac conduction disorders. Indications and techniques of cardiac pacing have also evolved to allow safe perma- nent cardiac pacing in almost all patients, including those with structural heart abnormalities

    Exploring productivity and collaboration in Australian Indigenous health research, 1995-2008

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    BACKGROUND Building research capacity in Indigenous health has been recognised as integral in efforts to reduce the significant health disparities between Indigenous and other Australian populations. The past few decades have seen substantial changes in funding policy for Australian Indigenous health research, including increases in overall expenditure and a greater focus on collaborative and priority-driven research. However, whether these policy shifts have resulted in any change to the structure of the research workforce in this field is unclear. We examine research publications in Australian Indigenous health from 1995–2008 to explore trends in publication output, key themes investigated, and research collaborations. METHODS A comprehensive literature search was undertaken to identify research publications about Australian Indigenous health from 1995–2008. Abstracts of all publications identified were reviewed by two investigators for relevance. Eligible publications were classified according to key themes. Social network analyses of co-authorship patterns were used to examine collaboration in the periods 1995–1999, 2000–2004 and 2005–2008. RESULTS Nine hundred and fifty three publications were identified. Over time, the number of publications per year increased, particularly after 2005, and there was a substantial increase in assessment of health service-related issues. Network analyses revealed a highly collaborative core group of authors responsible for the majority of outputs, in addition to a series of smaller separate groups. In the first two periods there was a small increase in the overall network size (from n = 583 to n = 642 authors) due to growth in collaborations around the core. In the last period, the network size increased considerably (n = 1,083), largely due to an increase in the number and size of separate groups. The general size of collaborations also increased in this period. CONCLUSIONS In the past few decades there has been substantial development of the research workforce in Indigenous health, characterised by an increase in authors and outputs, a greater focus on some identified priority areas and sustained growth in collaborations. This has occurred in conjunction with significant changes to funding policy for Indigenous health research, suggesting that both productivity and collaboration may be sensitive to reform, including the provision of dedicated funding.Alice R Rumbold, Joan Cunningham, Brydie Purbrick and Jenny M Lewi

    Frequently asked questions about chlorophyll fluorescence, the sequel

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    [EN] Using chlorophyll (Chl) a fluorescence many aspects of the photosynthetic apparatus can be studied, both in vitro and, noninvasively, in vivo. Complementary techniques can help to interpret changes in the Chl a fluorescence kinetics. Kalaji et al. (Photosynth Res 122: 121-158, 2014a) addressed several questions about instruments, methods and applications based on Chl a fluorescence. Here, additionalChl a fluorescence-related topics are discussed again in a question and answer format. 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    The global burden of cancer attributable to risk factors, 2010-19: a systematic analysis for the Global Burden of Disease Study 2019

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