生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地...生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地利用。本文对基于ISI Web of Knowledge新检索平台BP数据库的特点、结构及各种功能进行了详细地描述和系统地介绍。可指导研究人员使用数据库,可帮助信息咨询人员和文检课教师了解数据库。展开更多
This essay is going to have an in-depth analysis of the Collaborative Strategic Reading, a four-step reading comprehension strategy popular in the Western classrooms. It will start with some brief introduction about t...This essay is going to have an in-depth analysis of the Collaborative Strategic Reading, a four-step reading comprehension strategy popular in the Western classrooms. It will start with some brief introduction about this instructional approach in company with its theoretical rationale and research evidence for its effectiveness of improving learners' reading competence. Focused on the previewing skill, the first step of the reading instruction, a modified lesson plan is designed in the Chinese high school setting, followed by justification of the major elements of the plan, and some practical implications.展开更多
For carrier-based unmanned aerial vehicles(UAVs),one of the important problems is the design of an automatic carrier landing system(ACLS)that would enable the UAVs to accomplish autolanding on the aircraft carrier.How...For carrier-based unmanned aerial vehicles(UAVs),one of the important problems is the design of an automatic carrier landing system(ACLS)that would enable the UAVs to accomplish autolanding on the aircraft carrier.However,due to the movements of the flight deck with six degree-of-freedom,the autolanding becomes sophisticated.To solve this problem,an accurate and effective ACLS is developed,which is composed of an optimal preview control based flight control system and a Kalman filter based deck motion predictor.The preview control fuses the future information of the reference glide slope to improve landing precision.The reference glide slope is normally a straight line.However,the deck motion will change the position of the ideal landing point,and tracking the ideal straight glide slope may cause landing failure.Therefore,the predictive deck motion information from the deck motion predictor is used to correct the reference glide slope,which decreases the dispersion around the desired landing point.Finally,simulations are carried out to verify the performance of the designed ACLS based on a nonlinear UAV model.展开更多
A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An...A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An adaptive genetic algorithm is used to optimize the parameters of the neuron PI controller. The simulation result of the neuron PI control for semi-active suspension system of tracked vehicle indicates that the vertical amplitude,pitch angle and vertical acceleration of the vehicle are well controlled. The root mean square (RMS) of the vertical amplitude decreases by 37.2%,and 45.2% for the pitch angle,38.6% for the vertical acceleration. The research of neuron PI control experiment for the semi-active suspension system of the tracked vehicle model mining in benthal indicates that the RMS of the weight acceleration vibrating along the vertical direction decreases by 29.5%,the power spectral density resonance peak of the acceleration of the car body decreases by 23.8%.展开更多
This paper proposes a static-output-feedback based robust fuzzy wheelbase preview control algorithm for uncertain active suspensions with time delay and finite frequency constraint.Firstly,a Takagi-Sugeno(T-S)fuzzy au...This paper proposes a static-output-feedback based robust fuzzy wheelbase preview control algorithm for uncertain active suspensions with time delay and finite frequency constraint.Firstly,a Takagi-Sugeno(T-S)fuzzy augmented model is established to formulate the half-car active suspension system with consideration of time delay,sprung mass variation and wheelbase preview information.Secondly,in view of the resonation between human’s organs and vertical vibrations in the frequency range of 4–8 Hz,a finite frequency control criterion in terms of H∞norm is developed to improve ride comfort.Meanwhile,other mechanical constraints are also considered and satisfied via generalized H2 norm.Thirdly,in order to maintain the feasibility of the controller despite of some state variables are not online-measured,a two stage approach is adopted to derive a static output feedback controller.Finally,numerical simulation results illustrate the excellent performance of the proposed controller.展开更多
文摘2025年6月10日,科睿唯安(Clarivate Analytics)来函通知,《临床肝胆病杂志》被Web of Science合集中的BIOSIS Citation Index(生命科学引文索引,BCI)、BIOSIS Previews(生命科学信息预览,BP)、Biological Abstracts(生命科学文摘,BA)等3个数据库收录。BCI是生命科学领域内容最权威的引文索引数据库之一,不仅收录BP数据库全部期刊信息,还包含Web of Science未索引的原始研究报告以及重要研究文献的参考文献数据等。
文摘生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地利用。本文对基于ISI Web of Knowledge新检索平台BP数据库的特点、结构及各种功能进行了详细地描述和系统地介绍。可指导研究人员使用数据库,可帮助信息咨询人员和文检课教师了解数据库。
文摘This essay is going to have an in-depth analysis of the Collaborative Strategic Reading, a four-step reading comprehension strategy popular in the Western classrooms. It will start with some brief introduction about this instructional approach in company with its theoretical rationale and research evidence for its effectiveness of improving learners' reading competence. Focused on the previewing skill, the first step of the reading instruction, a modified lesson plan is designed in the Chinese high school setting, followed by justification of the major elements of the plan, and some practical implications.
基金supported in part by the National Natural Science Foundations of China(Nos.61304223,61673209,61533008)the Aeronautical Science Foundation(No.2016ZA 52009)the Fundamental Research Funds for the Central Universities(No.NJ20160026)
文摘For carrier-based unmanned aerial vehicles(UAVs),one of the important problems is the design of an automatic carrier landing system(ACLS)that would enable the UAVs to accomplish autolanding on the aircraft carrier.However,due to the movements of the flight deck with six degree-of-freedom,the autolanding becomes sophisticated.To solve this problem,an accurate and effective ACLS is developed,which is composed of an optimal preview control based flight control system and a Kalman filter based deck motion predictor.The preview control fuses the future information of the reference glide slope to improve landing precision.The reference glide slope is normally a straight line.However,the deck motion will change the position of the ideal landing point,and tracking the ideal straight glide slope may cause landing failure.Therefore,the predictive deck motion information from the deck motion predictor is used to correct the reference glide slope,which decreases the dispersion around the desired landing point.Finally,simulations are carried out to verify the performance of the designed ACLS based on a nonlinear UAV model.
基金Project(2010GK3091) supported by Industrial Support Project in Science and Technology of Hunan Province, ChinaProject(10B058) supported by Excellent Youth Foundation Subsidized Project of Hunan Provincial Education Department, China
文摘A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An adaptive genetic algorithm is used to optimize the parameters of the neuron PI controller. The simulation result of the neuron PI control for semi-active suspension system of tracked vehicle indicates that the vertical amplitude,pitch angle and vertical acceleration of the vehicle are well controlled. The root mean square (RMS) of the vertical amplitude decreases by 37.2%,and 45.2% for the pitch angle,38.6% for the vertical acceleration. The research of neuron PI control experiment for the semi-active suspension system of the tracked vehicle model mining in benthal indicates that the RMS of the weight acceleration vibrating along the vertical direction decreases by 29.5%,the power spectral density resonance peak of the acceleration of the car body decreases by 23.8%.
基金supported by the National Natural Science Foundation of China(51705084)the Natural Science Foundation of Guangdong Province(2018A030313999,2019A1515011602)+6 种基金the Fundamental Research Funds for the Central Universities(N2003032)the Opening Project of Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSouth China University of Technology(2019kfkt06,2020kfkt05)the Research Grants of the University of Macao(MYRG2019-00028-FST)Guangdong Regular Institutions of Characteristic Innovation Project(2017KTSCX176)Key Laboratory of Robotics and Intelligent Equipment of Guangdong Regular Institutions of Higher Education(2017KSYS009)the National Key Research and Development Program of China(2017YFB1300200,2017YFB1300203)。
文摘This paper proposes a static-output-feedback based robust fuzzy wheelbase preview control algorithm for uncertain active suspensions with time delay and finite frequency constraint.Firstly,a Takagi-Sugeno(T-S)fuzzy augmented model is established to formulate the half-car active suspension system with consideration of time delay,sprung mass variation and wheelbase preview information.Secondly,in view of the resonation between human’s organs and vertical vibrations in the frequency range of 4–8 Hz,a finite frequency control criterion in terms of H∞norm is developed to improve ride comfort.Meanwhile,other mechanical constraints are also considered and satisfied via generalized H2 norm.Thirdly,in order to maintain the feasibility of the controller despite of some state variables are not online-measured,a two stage approach is adopted to derive a static output feedback controller.Finally,numerical simulation results illustrate the excellent performance of the proposed controller.
