This article provides a closed form solution to the telegrapher’s equation with three space variables defined on a subset of a sphere within two radii, two azimuthal angles and one polar angle. The Dirichlet problem ...This article provides a closed form solution to the telegrapher’s equation with three space variables defined on a subset of a sphere within two radii, two azimuthal angles and one polar angle. The Dirichlet problem for general boundary conditions is solved in detail, on the basis of which Neumann and Robin conditions are easily handled. The solution to the simpler problem in cylindrical coordinates is also provided. Ways to efficiently implement the formulae are explained. Minor adjustments result in solutions to the wave equation and to the heat equation on the same domain as well, since the latter are particular cases of the more general telegrapher’s equation.展开更多
In this article,we study a robust estimation method for a general class of integervalued time series models.The conditional distribution of the process belongs to a broad class of distributions and unlike the classica...In this article,we study a robust estimation method for a general class of integervalued time series models.The conditional distribution of the process belongs to a broad class of distributions and unlike the classical autoregressive framework,the conditional mean of the process also depends on some exogenous covariates.We derive a robust inference procedure based on the minimum density power divergence.Under certain regularity conditions,we establish that the proposed estimator is consistent and asymptotically normal.In the case where the conditional distribution belongs to the exponential family,we provide sufficient conditions for the existence of a stationary and ergodicτ-weakly dependent solution.Simulation experiments are conducted to illustrate the empirical performances of the estimator.An application to the number of transactions per minute for the stock Ericsson B is also provided.展开更多
The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city ar...The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city are studied, the research results prove the actual value of the Central Place Theory, and the suggestion of adjustment in the space distribution Shijiazhuang of post offices in city is put forward.展开更多
Objectives The rising prevalence of musculoskeletal disorders increases pressure on primary care services.In France,patients with musculoskeletal disorders are referred to physiotherapist(PT)by family physician(FP).To...Objectives The rising prevalence of musculoskeletal disorders increases pressure on primary care services.In France,patients with musculoskeletal disorders are referred to physiotherapist(PT)by family physician(FP).To improve access to musculoskeletal care,a new model of task sharing and shifting is implemented between FPs and PTs for patients with acute low back pain.This new model enables French PTs to expand their usual scope of practice by receiving patients as first-contact practitioner,diagnosing low back pain,prescribing sick leave and analgesic medication.The aim of this study is to investigate the acceptability of FPs and PTs regarding this new model.Design A cross-sectional survey design was used.Acceptability was measured using a questionnaire on the perception of the model and the perception of PTs’skills to manage low back pain.Descriptive analyses were performed to compare results among participants.Setting French FPs and PTs working in multidisciplinary primary healthcare centres were invited to complete an online survey.Participants A total of 174 respondents completed the survey(81 FPs and 85 PTs).Results A majority of participants had a positive perception of the task sharing and shifting model.A majority of the participants were mostly or totally favourable towards the implementation of the model(FPs:n=46,82%and PTs:n=40,82%).The perceived level of competencies of PTs to manage acute low back pain was high.The confidence level of FPs was higher than that of PTs regarding PTs’ability to adequately diagnose low back pain,refer patient to physiotherapy and prescribe sick leave or analgesic medication.Conclusion Based on this limited sample of participants,there appears to be good acceptability of the task sharing and shifting model for acute low back pain.Additional studies are needed to better determine the factors affecting the acceptability of such a model.展开更多
One of China’s leading newsci-fi voices,Chen Qiufan is known for writing about social alienation in high-tech versions of the real world.His recent short story "The Dark Room Problem" takes a metaphysical d...One of China’s leading newsci-fi voices,Chen Qiufan is known for writing about social alienation in high-tech versions of the real world.His recent short story "The Dark Room Problem" takes a metaphysical dive into how technology manipulates our consciousness.展开更多
文摘This article provides a closed form solution to the telegrapher’s equation with three space variables defined on a subset of a sphere within two radii, two azimuthal angles and one polar angle. The Dirichlet problem for general boundary conditions is solved in detail, on the basis of which Neumann and Robin conditions are easily handled. The solution to the simpler problem in cylindrical coordinates is also provided. Ways to efficiently implement the formulae are explained. Minor adjustments result in solutions to the wave equation and to the heat equation on the same domain as well, since the latter are particular cases of the more general telegrapher’s equation.
基金supported by the MME-DII center of excellence(ANR-11-LABEX-0023-01)the ANR BREAKRISK:ANR-17-CE26-0001-01+1 种基金the CY Initiative of Excellence(grant“Investissements d’Avenir”ANR-16-IDEX-0008)Project“EcoDep”PSI-AAP2020-0000000013.
文摘In this article,we study a robust estimation method for a general class of integervalued time series models.The conditional distribution of the process belongs to a broad class of distributions and unlike the classical autoregressive framework,the conditional mean of the process also depends on some exogenous covariates.We derive a robust inference procedure based on the minimum density power divergence.Under certain regularity conditions,we establish that the proposed estimator is consistent and asymptotically normal.In the case where the conditional distribution belongs to the exponential family,we provide sufficient conditions for the existence of a stationary and ergodicτ-weakly dependent solution.Simulation experiments are conducted to illustrate the empirical performances of the estimator.An application to the number of transactions per minute for the stock Ericsson B is also provided.
文摘The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city are studied, the research results prove the actual value of the Central Place Theory, and the suggestion of adjustment in the space distribution Shijiazhuang of post offices in city is put forward.
基金This project was funded to AK by the“Union Régionale des Professionnels de SantéMasseur-Kinésithérapeutes”of the Auvergne-Rhône Alpes region in France,as part of a doctoral grant.
文摘Objectives The rising prevalence of musculoskeletal disorders increases pressure on primary care services.In France,patients with musculoskeletal disorders are referred to physiotherapist(PT)by family physician(FP).To improve access to musculoskeletal care,a new model of task sharing and shifting is implemented between FPs and PTs for patients with acute low back pain.This new model enables French PTs to expand their usual scope of practice by receiving patients as first-contact practitioner,diagnosing low back pain,prescribing sick leave and analgesic medication.The aim of this study is to investigate the acceptability of FPs and PTs regarding this new model.Design A cross-sectional survey design was used.Acceptability was measured using a questionnaire on the perception of the model and the perception of PTs’skills to manage low back pain.Descriptive analyses were performed to compare results among participants.Setting French FPs and PTs working in multidisciplinary primary healthcare centres were invited to complete an online survey.Participants A total of 174 respondents completed the survey(81 FPs and 85 PTs).Results A majority of participants had a positive perception of the task sharing and shifting model.A majority of the participants were mostly or totally favourable towards the implementation of the model(FPs:n=46,82%and PTs:n=40,82%).The perceived level of competencies of PTs to manage acute low back pain was high.The confidence level of FPs was higher than that of PTs regarding PTs’ability to adequately diagnose low back pain,refer patient to physiotherapy and prescribe sick leave or analgesic medication.Conclusion Based on this limited sample of participants,there appears to be good acceptability of the task sharing and shifting model for acute low back pain.Additional studies are needed to better determine the factors affecting the acceptability of such a model.
文摘One of China’s leading newsci-fi voices,Chen Qiufan is known for writing about social alienation in high-tech versions of the real world.His recent short story "The Dark Room Problem" takes a metaphysical dive into how technology manipulates our consciousness.
