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1,655 results on '"Zhou, Weiwei"'

76. Tobacco smoking and risks of more than 470 diseases in China: a prospective cohort study

Author

Avery, Daniel, Bennett, Derrick, Boxall, Ruth, Burgess, Sushila, Chan, Peter Ka Hung, Chen, Yiping, Chen, Zhengming, Clarke, Johnathan, Clarke, Robert, Du, Huaidong, Mohamed, Ahmed Edris, Fry, Hannah, Gilbert, Simon, Hill, Mike, Im, Becky Pek Kei, Iona, Andri, Kakkoura, Maria, Kartsonaki, Christiana, Lam, Hubert, Lin, Kuang, Mazidi, Mohsen, Millwood, Iona Y, Morris, Sam, Nie, Qunhua, Pozarickij, Alfred, Ryder, Paul, Said, Saredo, Schmidt, Dan, Sherliker, Paul, Stevens, Rebecca, Turnbull, Iain, Walters, Robin, Wang, Lin, Wright, Neil, Yang, Ling, Yang, Xiaoming, Yao, Pang, Guo, Yu, Han, Xiao, Hou, Can, Xia, Qingmei, Liu, Chao, Lv, Jun, Pei, Pei, Yu, Canqing, Chen, Junshi, Collins, Rory, Li, Liming, Wang, Chen, Peto, Richard, Chen, Naying, Liu, Duo, Tang, Zhenzhu, Chen, Ningyu, Jiang, Qilian, Lan, Jian, Li, Mingqiang, Liu, Yun, Meng, Fanwen, Meng, Jinhuai, Pan, Rong, Qin, Yulu, Wang, Ping, Wang, Sisi, Wei, Liuping, Zhou, Liyuan, Dong, Caixia, Ge, Pengfei, Ren, Xiaolan, Li, Zhongxiao, Mao, Enke, Wang, Tao, Zhang, Hui, Zhang, Xi, Chen, Jinyan, Hu, Ximin, Wang, Xiaohuan, Guo, Zhendong, Li, Huimei, Li, Yilei, Weng, Min, Wu, Shukuan, Yan, Shichun, Zou, Mingyuan, Zhou, Xue, Guo, Ziyan, Kang, Quan, Li, Yanjie, Yu, Bo, Xu, Qinai, Chang, Liang, Fan, Lei, Feng, Shixian, Zhang, Ding, Zhou, Gang, Gao, Yulian, He, Tianyou, He, Pan, Hu, Chen, Sun, Huarong, Zhang, Xukui, Chen, Biyun, Fu, Zhongxi, Huang, Yuelong, Liu, Huilin, Xu, Qiaohua, Yin, Li, Long, Huajun, Xu, Xin, Zhang, Hao, Zhang, Libo, Su, Jian, Tao, Ran, Wu, Ming, Yang, Jie, Zhou, Jinyi, Zhou, Yonglin, Hu, Yihe, Hua, Yujie, Jin, Jianrong, Liu, Fang, Liu, Jingchao, Lu, Yan, Ma, Liangcai, Tang, Aiyu, Zhang, Jun, Cheng, Liang, Du, Ranran, Gao, Ruqin, Li, Feifei, Li, Shanpeng, Liu, Yongmei, Ning, Feng, Pang, Zengchang, Sun, Xiaohui, Tian, Xiaocao, Wang, Shaojie, Zhai, Yaoming, Zhang, Hua, Hou, Wei, Lv, Silu, Wang, Junzheng, Chen, Xiaofang, Wu, Xianping, Zhang, Ningmei, Zhou, Weiwei, Li, Jianguo, Liu, Jiaqiu, Luo, Guojin, Sun, Qiang, Zhong, Xunfu, Gong, Weiwei, Hu, Ruying, Wang, Hao, Wang, Meng, Yu, Min, Chen, Lingli, Gu, Qijun, Pan, Dongxia, Wang, Chunmei, Xie, Kaixu, Zhang, Xiaoyi, Chan, Ka Hung, and Xiao, Dan

Published
2022
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82. The temporal and spatial constraints of saccade planning to double-step target displacements

Author

Kelly, Shane, Zhou, Weiwei, Bansal, Sonia, Peterson, Matthew S, and Joiner, Wilsaan M

Subjects
Biomedical and Clinical Sciences, Ophthalmology and Optometry, Female, Fixation, Ocular, Humans, Male, Motor Neurons, Reaction Time, Saccades, Spatio-Temporal Analysis, Young Adult, Saccade, Goal, Planning, Spatiotemporal, Double-step, Medical and Health Sciences, Psychology and Cognitive Sciences, Experimental Psychology, Ophthalmology and optometry
Abstract

The double-step paradigm investigates the characteristics of planning and execution when the motor system must rapidly adjust for a new goal location. Studies have provided detailed temporal information based on the duration available for the motor system to prepare a new movement trajectory (here referred to as re-preparation time). However, previous work has largely examined single displacement sizes, limiting the spatiotemporal understanding of movement planning and execution. The lack of a description of this behavioral timecourse across increasing displacement sizes is true for saccades, rapid eye movements that redirect the fovea. Furthermore, during the double-step paradigm, the primary saccade often fails to accurately foveate the final target location and a secondary saccade brings the target onto the fovea. However, it is also unknown how this compensation is concurrently modified with the exposure duration and displacement of the movement goal. Here, we examined the amount of time required to change the initial saccade direction to a new target location for relatively small (20°, 30°, and 40°) and large (60° and 90°) target spatial separations. Interestingly, we found a clear relationship between the saccade direction and the amount of time allowed to redirect the movement; across separations, intermediate saccades occurred when approximately 60-140 ms was available to readjust the movement plan. Additionally, there was a consistent relationship between the timing of the secondary saccade and the re-preparation time across jump sizes, suggesting that concurrent movement correction planning was dependent on the amount of exposure to the final movement goal.

Published
2019

83. Movement Improves the Quality of Temporal Perception and Decision Making

Author

Wiener, Martin, Zhou, Weiwei, Bader, Farah, and Joiner, Wilsaan M

Subjects
Biological Psychology, Cognitive and Computational Psychology, Psychology, Behavioral and Social Science, Clinical Research, 1.1 Normal biological development and functioning, 1.2 Psychological and socioeconomic processes, Underpinning research, Adult, Decision Making, Female, Humans, Male, Psychomotor Performance, Reaction Time, Time Perception, Young Adult, decision-making, movement, perception, time perception, Neurosciences
Abstract

A critical aspect of behavior is that mobile organisms must be able to precisely determine where and when to move. A better understanding of the mechanisms underlying precise movement timing and action planning is therefore crucial to understanding how we interact with the world around us. Recent evidence suggests that our experience of time is directly and intrinsically computed within the motor system, consistent with the theory of embodied cognition. To investigate the role of the motor system, we tested human subjects (n = 40) on a novel task combining reaching and time estimation. In this task, subjects were required to move a robotic manipulandum to one of two physical locations to categorize a concurrently timed suprasecond. Critically, subjects were divided into two groups: one in which movement during the interval was unrestricted and one in which they were restricted from moving until the stimulus interval had elapsed. Our results revealed a higher degree of precision for subjects in the free-moving group. A further experiment (n = 14) verified that these findings were not due to proximity to the target, counting strategies, bias, or movement length. A final experiment (n = 10) replicated these findings using a within-subjects design, performing a time reproduction task, in which movement during encoding of the interval led to more precise performance. Our findings suggest that time estimation may be instantiated within the motor system as an ongoing readout of timing judgment and confidence.

Published
2019

84. Efficacy, safety and immunogenicity of hexavalent rotavirus vaccine in Chinese infants

Author

Wu, Zhiwei, Li, Qingliang, Liu, Yan, Lv, Huakun, Mo, Zhaojun, Li, Fangjun, Yu, Qingchuan, Jin, Fei, Chen, Wei, Zhang, Yong, Huang, Teng, Hu, Xiaosong, Xia, Wei, Gao, Jiamei, Zhou, Haisong, Bai, Xuan, Liu, Yueyue, Liang, Zhenzhen, Jiang, Zhijun, Chen, Yingping, Zhang, Jiuwei, Du, Jialiang, Yang, Biao, Xing, Bo, Xing, Yantao, Dong, Ben, Yang, Qinghai, Shi, Chen, Yan, Tingdong, Ruan, Bo, Shi, Haiyun, Fan, Xingliang, Feng, Dongyang, Lv, Weigang, Zhang, Dong, Kong, Xiangchu, Zhou, Liuyifan, Que, Dinghong, Chen, Hong, Chen, Zhongbing, Guo, Xiang, Zhou, Weiwei, Wu, Cong, Zhou, Qingrong, Liu, Yuqing, Qiao, Jian, Wang, Ying, Li, Xinguo, Duan, Kai, Zhao, Yuliang, Xu, Gelin, and Yang, Xiaoming

Published
2022
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94. Ionization and fragmentation dynamics of singly and multiply charged ions

Author

Zhou, Weiwei and Vallance, Claire

Subjects
541, Reaction dynamics, Chemical dynamics, First principles computational chemistry, Chemistry, Physical and theoretical
Abstract

This thesis investigates the ionization and fragmentation dynamics of gas-phase molecules, particularly those relevant to astrochemistry and of interest in velocity-map imaging experiments into the dynamics of Coulomb explosions. These two topics are covered in Part I and Part II, respectively. Part I focuses on the redesign of a total electron ionization cross-section measurement apparatus. The aim was to satisfy a number of key experimental criteria, such as achieving full collection efficiency for the ions and electrons generated in the experiment, and obtaining accurate absolute pressure and temperature measurements. A combination of SIMION ion and electron trajectory simulations and experimental optimisation led to the final version of the instrument. The absolute total cross-section data obtained using the apparatus (including nine interstellar molecules measured) are considered to be highly reliable without significant sources of systematic errors, and the results show good agreement with cross-sections predicted using the binary-encounter Bethe (BEB) model, especially at low incident electron energy. In common with previous studies, the maximum in the experimentally measured cross-section correlates linearly with the molecular polarizability volume. The instrument developed in this thesis will be used to perform further measurements on many more molecules, and the absolute total cross-section data will be combined with relative partial ionization cross-section data measured on an electron-molecule crossed-beam velocity-map imaging apparatus in the same laboratory to determine absolute partial ionization cross-sections for each fragment ion. A larger project to establish a comprehensive database which contains both total and partial ionization cross-sections of molecules relevant to astrochemistry and plasma science is proposed, and is currently under development. Part II of the thesis is devoted to the ionization and fragmentation dynamics of multiply charged ions, for which Coulomb explosion plays an important role as a dissociation mechanism. While femtosecond-laser-pulse-induced Coulomb explosion experiments have been performed extensively, the corresponding simulation work has relied on simple Coulomb-only models. In the present work, we develop a new trajectory simulation code in which the forces on each atom are calculated via electronic structure methods at each trajectory time step. The electronic structure calculations and classical trajectory calculations are performed within Gaussian and Matlab, respectively, packaged within a single executable Linux shell script. All Gaussian and Matlab parameters may be set and adjusted to calculate outcomes such as evolution of atomic charges, bond orders, bond lengths, atomic velocities, atomic forces, and SCF energies of the molecular system. In addition to providing additional insight into the product scattering distributions observed in Coulomb-explosion imaging experiments, the simulations also allow a number of experimentally inaccessible features to be investigated, including details of the fragmentation mechanism and the extensive charge redistribution that occurs in the early stages of the Coulomb explosion process. The new simulation program is the good starting point towards full simulation as per experimental conditions to re-produce measured velocity-map images. Future work will develop multi-trajectory simulations based on a range of initial conditions sampled statistically. With ever-increasing CPU power and proper technical considerations, this perspective is no longer out of reach.

Published
2018

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