检索结果-南通市图书馆

What are the Acute Effects of Aerobic Exercise on Fractionated response time:A Systematic Review and Meta-analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Science in Sport and Exercise 2020年第2期2卷 97-112页

作者： Razie J Alibazi Dawson Kidgell Maryam Zoghi Shapour Jaberzadeh Non-invasive Brain Stimulation and Neuroplasticity Laboratory Department of PhysiotherapySchool of Primary and Allied Health CareFaculty of MedicineNursing and Health ScienceMonash UniversityP.O.Box 527MelbourneVIC 3199Australia Department of Rehabilitation Nutrition and SportSchool of Allied HealthLa Trobe UniversityBundooraVICAustralia

Recently,there have been several studies that have examined the acute effects of aerobic exercise on cognitive function.Importantly,one precise indicator of cognitive function is response time(RT),which has two main components;premotor time(PMT)and motor time(MT).PMT is the time for perception,decision making and response preparation,while MT is executing the response.Using fractionated response time(FRT)instead of RT provides a more precise estimate of the location of the effect of aerobic exercise on cognitive or motor components of the response.There is emerging evidence that shows an acute bout of exercise may improve FRT.Therefore,the purpose of this systematic review and meta-analysis was to explore the acute effect of aerobic exercise on FRT by considering the effects of various cognitive function tests.Fourteen studies were included investigating FRT during and/or after aerobic exercise.The results indicated that during exercise,PMT increased in simple reaction time and decreased in flanker task;MT decreased in choice reaction time;interestingly,RT decreased when it was assessed by choice reaction time and flanker task,almost similar to PMT and MT.After exercise,PMT decreased specifically in flanker and go/no-go tasks.However,MT and RT did not change significantly.In conclusion,as changes in RT are affected by both PMT and MT,FRT provides a more precise estimate of the locus of the effects of aerobic exercise on response time.

关键词： Physical activity Cognitive function response time Premotor time

Strong-field response time and its implications on attosecond measurement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第3期31卷 16-23页

作者：陈超车佳殷谢雪娇王赏辛国国陈彦军 College of Physics and Information Technology Shaan'xi Normal UniversityXi'an 710119China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China School of Physics Northwest UniversityXi'an 710127China

To measure and control the electron motion in atoms and molecules by the strong laser field on the attosecond time scale is one of the research frontiers of atomic and molecular photophysics. It involves many new phenomena and processes and raises a series of questions of concepts, theories, and methods. Recent studies show that the Coulomb potential can cause the ionization time lag(about 100 attoseconds) between instants of the field maximum and the ionization-rate maximum. This lag can be understood as the response time of the electronic wave function to the strong-field-induced ionization event. It has a profound influence on the subsequent ultrafast dynamics of the ionized electron and can significantly change the time–frequency properties of electron trajectory(an important theoretical tool for attosecond measurement). Here, the research progress of response time and its implications on attosecond measurement are briefly introduced.

关键词： response time strong-field ionization Coulomb effect attosecond measurement

The response time Analysis of Digital Broadcasting System

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2005年第3期10卷 515-519页

作者： WANGShuo ZHANGJiang-ling FENGDan SchoolofComputerScienceandTechnology HuazhongUniversityofScienceandTechnologyWuhan430074HubeiChina

Digital broadcasting system has become a high-light of research on computer application. To respond to the changes of the playbill in the broadcasting system in real time, the response time of the system must be studied. There is scarcely the research on this area currently. The influence factors in the response time are analyzed; the model on the response time of the system service is built; how the influence factors affect the response time of the system service is validated; and four improvement measures are proposed to minimize the response time of system service.

关键词： Key words digital broadcasting system response time analysis real time

An Improved Text-Based and Image-Based CAPTCHA Based on Solving and response time

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第2期74卷 2661-2675页

作者： Ademola Olusola Adesina Patrick Seun Ayobioloja Ibidun Christiana Obagbuwa Tola John Odule Adenrele AAfolorunso Sunday Adeola Ajagbe Department of Mathematical Sciences Olabisi Onabanjo University Ago-Iwoye120107Nigeria National Open University of Nigeria Abuja900001Nigeria Sol Plaatje University KimberleyNorthern Cape8305South Africa Computer Engineering Department Ladoke Akintola University of TechnologyLAUTECHOgbomoso210214Nigeria

CAPTCHA is an acronym that stands for Completely Automated Public Turing Test to tell Computers and Humans Apart(CAPTCHA),it is a good example of an authentication system that can be used to determine the true identity of any user.It serves as a security measure to prevent an attack caused by web bots(automatic programs)during an online transaction.It can come as text-based or image-based depending on the project and the programmer.The usability and robustness,as well as level of security,provided each of the varies and call for the development of an improved system.Hence,this paper studied and improved two different CAPTCHA systems(the text-based CAPTCHA and image-based CAPTCHA).The textbased and image-based CAPTCHAwere designed using JavaScript.response time and solving time are the two metrics used to determine the effectiveness and efficiency of the two CAPTCHA systems.The inclusion of response time and solving time improved the shortfall of the usability and robustness of the existing system.The developed system was tested using 200 students from the Federal College of Animal Health and Production Technology.The results of each of the participants,for the two CAPTCHAs,were extracted from the database and subjected to analysis using SPSS.The result shows that textbased CAPTCHAhas the lowest average solving time(21.3333 s)with a 47.8%success rate while image-based CAPTCHA has the highest average solving time was 23.5138 s with a 52.8%success rate.The average response time for the image-based CAPTCHA was 2.1855 s with a 37.9%success rate lower than the text-based CAPTCHA response time(3.5561 s)with a 62.1%success rate.This indicates that the text-based CAPTCHA is more effective in terms of usability tests while image-based CAPTCHA is more efficient in terms of system responsiveness and recommended for potential users.

关键词： CAPTCHA computational intelligence information security response time solving time

Finite Difference Solution of response time Delay of Magneto-rhelological Damper

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2009年第3期22卷 446-450页

作者： ZOU Mingsong HOU Baolin School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Magneto-rhelological（MR） dampers are devices that employ rheological fluids to modify their mechanical properties. Their mechanical simplicity, high dynamic range, lower power requirements, large force capacity, robustness and safe maimer of operation in cases of failure have made them attractive devices for semi-active real-time control in civil, aerospace and automotive applications. time response characteristic is one of the most important technical performances of MR dampers, and response time directly affects the control frequency, application range and the actual effect of MR dampers. In this study, one kind of finite difference solution for predicting the response time ofmagneto-rheological dampers from ＂off-state＂ to ＂on-state＂ is put forward. A laminar flow model is used to describe the flow in the MR valve, and a bi-viscous fluid flow model is utilized to describe the relationship of shear stress and shear rate of MR fluid. An explicit difference format is used to diseretize the Novior-Stoks equation, and stability condition of this algorithm is built by Von-Neumann stability criterion. The pressure gradient along the flow duct is solved by a dichotomy algorithm with iteration, and the changing curve of the damping force versus time of MR damper is obtained as well. According to the abovementioned numerical algorithm, the damping forces versus time curves from ＂off-state＂ to ＂on-state＂ of a cylindrical piston type MR damper are computed. Moreover, the MR damper is installed in a material test system（MTS）, the magnetic field in the wire circles of the MR damper is ＂triggered＂ when the MR damper is imposed to do a constant speed motion, and the damping force curves are recorded. The comparison between numerical results and experimental results indicates that this finite difference algorithm can be used to estimate the response time delay of MR dampers.

关键词： magneto-rheological damper response time finite difference method

The simulation of temperature dependence of responsivity and response time for 6H-SiC UV photodetector

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2007年第5期16卷 1276-1279页

作者：张义门周拥华张玉明 Key Lab of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices Microelectronics Institute Xidian University Xi'an 710071 China

In this paper the temperature dependence of responsivity and response time for 6H-SiC ultraviolet （UV） photodetector is simulated based on numerical model in the range from 300 K to 900 K. The simulation results show that the responsivity and the response time of device are less sensitive to temperature and this kind of UV photodetector has excellent temperature stability. Also the effects of device structure and bias voltage on the responsivity and the response time are presented. The thicker the drift region is, the higher the responsivity and the longer the response time are. So the thickness of drift region has to be carefully designed to make trade-off between responsivity and response time.

关键词： 6H-Silicon carbide UV photodetector absorption coefficient responsivity response time

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于缩短响应时间的供应链管理系统的实现

物流管理

Recent Advances on Early-Stage Fire-Warning Systems: Mechanism, Performance, and Perspective

物流管理 2009年第1期 190-193页

作者：付秋芳王文博

系统地研究了基于缩短响应时间的供应链管理模式，提出了四个订单流驱动的控制原理。以缩短供应链响应时间为目标，提出了基于Web的供应链管理系统解决方案。并实现了供应链管理系统的系统管理、客户关系管理、电子购销管理、合同管理... 详细信息

系统地研究了基于缩短响应时间的供应链管理模式，提出了四个订单流驱动的控制原理。以缩短供应链响应时间为目标，提出了基于Web的供应链管理系统解决方案。并实现了供应链管理系统的系统管理、客户关系管理、电子购销管理、合同管理、订单管理、仓储管理、运输管理和配送管理功能，该软件系统能够提高管理人员供应链管理的智能化决策水平。

关键词：供应链管理响应时间 Web服务 SCM response time Web service

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第12期14卷 106-136页

作者： Xiaolu Li Antonio Vazquez-Lopez Jose Sanchez del Rio Saez De-Yi Wang IMDEA Materials Institute C/Eric Kandel228906 GetafeMadridSpain E.T.S.de Ingenieros de Caminos Universidad Politecnica de MadridCalle Profesor Aranguren 328040 MadridSpain Departamento de Ingenieria Electrica Electronica Automatica y Fisica AplicadaETSIDIUniversidad Politecnica de MadridRonda de Valencia 328012 MadridSpain

Early-stage fire-warning systems(EFWSs)have attracted significant attention owing to their superiority in detecting fire situations occurring in the pre-combustion process.Substantial progress on EFWSs has been achieved recently,and they have presented a considerable possibility for more evacuation time to control constant unintentional fire hazards in our daily life.This review mainly makes a comprehensive summary of the current EFWSs,including the working mechanisms and their performance.According to the different working mechanisms,fire alarms can be classified into graphene oxide-based fire alarms,semiconductor-based fire alarms,thermoelectric-based fire alarms,and fire alarms on other working mechanisms.Finally,the challenge and prospect for EFWSs are briefly provided by comparing the art of state of fire alarms.This work can propose a more comprehensive understanding of EFWSs and a guideline for the cutting-edge development direction of EFWSs for readers.

关键词： Smart thermosensitive fire sensors Working mechanism response time Signal conversion

Improving surveys with paradata:analytic uses of response time A study based on process information of China Family Dynamic Survey

在线全文

学校读者我要写书评

暂无评论

China Population and Development Studies 2018年第2期2卷 204-223页

作者： Yi Shi Jun Feng Xiaoqin Luo China Population and Development Research Center BeijingChina National Academy of Economic Strategy Chinese Academy of Social SciencesBeijingChina

This study uses paradata and survey data from the China Family Dynamic Survey to analyze the issue of response time in a questionnaire survey.The survey questions were classified into three levels and we compared the inter-group differences of response time between four kinds of questions which included information inquiries,logical calculations,intimate information and logical judgments.We used OLS method to perform a regression analysis to identify the impediments to response time and discussed the roles played by the survey locale,and the characteristics of interviewees and those of interviewers.The major impediments that prolonged response time were factors that impeded comprehension of the survey.The impediments included the difficulties interviewees had understanding questions,questions that did not take into account the different cultural backgrounds of interviewees,the complexity of questionnaires,and the performance of interviewers.Finally,this paper puts forward some suggestions for questionnaire design and investigation processes to reduce impediments to comprehension and improve the ability of interviewers.

关键词： Survey quality response time Paradata Questionnaire design