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1110篇 您的检索式:作者名="Beare"
    题名 作者 年代 出处 被引量
1特拉华欺凌受害量表(学生卷)中文版再修订及初步应用显示文摘目的:对特拉华欺凌受害量表(学生卷)2016版(Delaware Bullying Victimization Scale-Student,DBVS-S)进行中文修订,检验其信、效度及其跨性别、跨年级的测量等值性。方法:应用中文版DBVS-S对湖南省7个地区20所学校初一至高三3761名学生施测,以病人健康问卷抑郁量表(Patient Health Questionnaire-9,PHQ-9)和广泛性焦虑量表(Generalized Anxiety Disorder Scale-7,GAD-7)为效标,间隔三周之后随机抽取其中两个班共61名被试进行重测。结果:(1)验证性因素分析拟合结果表明DBVS-S采用一阶四因子模型最佳;(2)DBVS-S总分与PHQ-9和GAD-7的相关系数分别为0.321和0.347(P<0.01);总量表的α系数为0.906,三周后的重测信度为0.783;(3)多组验证性分析结果显示,DBVS-S中文版在初中高中生之间和男女生之间测量等值性假设成立,年级、性别之间的群组差异可以认为是样本特质造成的差异而非量表本身的系统误差所致;(4)方差分析结果显示欺凌受害程度男生显著高于女生(F=101.521,P<0.01,η~2=0.026),初中生显著高于高中生(F=324.609,P<0.01,η~2=0.080)。结论:特拉华欺凌受害量表(学生卷)中文版信效度良好,且测量结果可以在年级、性别之间跨组比较,可以用于中国青少年有关研究。谢家树 魏宇民 George Bear 2018中国临床心理学杂志2018,26,2:33
2Quasi-static Analysis of Thrust-loaded Angular Contact Ball Bearings Part Ⅰ:Theoretical Formulation显示文摘Ball bearings play an important role in various rotating machineries,but the complicated kinematic and tribological features of ball bearings make many aspects of their operating behaviors still inconclusive.Most theoretical analyses of ball bearings up to date are based on either the hypothesis of race control or other empirical models to determine the ball motion of ball bearings,but none of these strategies can reveal and consequently employ the intrinsic coupling mechanism between the spin and the tangential traction of contacting bodies rolling upon one another.To remedy the deficiency of current analytical models for ball bearing analysis,the rolling contact theory is employed to establish an explicit link between motions and interactions within ball bearings.A differential slip model is established to precisely define the slip component due to the significant curvature of the common contact patches between the ball and inner/outer raceways.The creepage and the spin ratio are formulated to accurately define the relative rigid motion between the ball and the inner/outer raceway.Then a quasi-static analytical model is established that can accurately determine the motions of the balls and races of the ball bearing.It can also give a vivid description of the slip and traction distributions within the contact area.The analytical model can be effectively used to analyze the operational conditions and tribological features of solid-lubricated ball bearings.It can also be used optimize the construction of ball bearings for specific applications.CHEN Wenhua1,2,MA Zikui1,GAO Liang1,LI Xinglin3,and PAN Jun2 1 Institute of Mechanical Design,Zhejiang University,Hangzhou 310027,China 2 Institute of Mechanical Design and Manufacturing,Zhejiang Sci-Tech University,Hangzhou 310018,China 3 State Testing Laboratory of Hangzhou Bearing Test & Research Center,Hangzhou 310022,China 2012Chinese Journal of Mechanical Engineering2012,25,1:16
3Experimental investigation of time-dependent cavitation in an oscillatory squeeze film显示文摘The occurrence of time-dependent cavitation and tensile stress in an oscillatory oil squeeze film were investigated experimentally. The test apparatus was a simple thrust bearing consisting of two parallel circular plates separated by a thin viscous oil film. During the test, one plate was at rest while the other (transparent) oscillated in a direction normal to its surface. This test configuration was chosen to avoid the rotational motion and complicated geometry of a squeeze film journal bearing. The frequency of oscillation was in the range of 5 to 50 Hz and was controlled by an electro-magnetic exciter. The process of cavity formation and its subsequent development was recorded by a high-speed video camera. Concomitant pressure in the oil film was measured both within and without the cavitation region. It was found that both tensile stress and cavities existed in a squeeze film under certain working conditions.CHEN Xiaoyang, SUN Meili, WANG Wen, D. C. SUN, ZHANG Zhiming & WANG XiaojingResearch Institute of Bearings, Shanghai University, Shanghai 200072, China Department of Mechanical Engineering, State University of New York at Binghamton, NY 13902-6000, USA 2004Science China(Physics,Mechanics & Astronomy)2004,47,z1:10
4Quasi-static Analysis of Thrust-loaded Angular Contact Ball Bearings Part Ⅱ:Results and Discussion显示文摘Ball bearings are widely employed mechanical components characterized by high precision and quality,and usually play important roles in various rotary machines and mechanisms.Many advanced applications require a deep understanding of their various kinematic and tribological characteristics that are essential to predict the fatigue endurance,relieve the vibration and minimize the power dissipation of ball bearings in particular applications.An angular contact ball bearing under a specified operating condition is simulated with the quasi-static/creepage analytical model proposed in the preceding article.The results demonstrate that the ball bearing is a statically determinate system.That the balls spin on both inner and outer races means the ball is controlled by neither the inner nor the outer raceway.The friction between the ball and raceway renders the inner and outer contact angles unequal.The larger the coefficient of friction is,the larger the angle deviation.The tangential traction perpendicular to the rolling direction due to the spin induces a gyro-like rotation of the ball with respect to the raceway even if no inertial effects are considered.The tangential elastic compliance of contacting surfaces gives rise to locked areas within the contact patch and transforms the sliding lines from circles into spirals.The differential slip due to the close conformity of the ball and raceway makes the sliding and traction distributions asymmetric,which will influence the location of the spinning center of the ball with respect to the raceway.The quasi-static/creepage model can be used to reveal the operating behaviors of ball bearings running under steady conditions and to optimize the design of ball bearings for specific applications.CHEN Wenhua1,2,MA Zikui1,GAO Liang1,LI Xinglin3,and PAN Jun2 1 Institute of Mechanical Design,Zhejiang University,Hangzhou 310027,China 2 Institute of Mechanical Design and Manufacturing,Zhejiang Sci-Tech University,Hangzhou 310018,China 3 State Testing Laboratory of Hangzhou Bearing Test & Research Center,Hangzhou 310022,China 2012Chinese Journal of Mechanical Engineering2012,25,1:7
5MATLAB WEB SERVER AND ITS APPLICATION IN REMOTE COLLABORATIVE DESIGN OF MAGNETIC BEARING SYSTEMS显示文摘Acclimatizing itself to the development of network,Math Works Inc constructed a MATLAB Web Server environment by dint of which one can browse the calculation and plots of MATLAB through Internet directly.The installation and use of the environment is introduced.A code established on the platform of MATLAB,which deals with the modal analysis of magnetic bearing system(MBS) supporting rotors of five degrees of freedom and considering the coupling of thrust bearing with radical bearings is modified to work in the environment.The purpose is to realize a remote call of the code by users through Internet for the performance analysis of the system.Such an application is very important to the concurrent design of MBS and for the utilization of distributive knowledge acquisition resources in collaborative design.The work on modification and realization is described and the results are discussed.Zhao Aiping Yu Lie Xie Youbai Theory of Lubrication and Bearing Institute,Xi’an Jiaotong University 2001Chinese Journal of Mechanical Engineering2001,14,2:6
6特拉华学生卷入度量表(学生卷)中文版修订显示文摘目的:检验特拉华学生卷入度量表(学生卷)(DSES-S)在中国青少年中的信、效度。方法:应用中文版特拉华学生卷入度量表对3119名中小学生施测,三周后抽取其中173名被试进行重测;以特拉华校园氛围量表(DSCSS),流调中心用抑郁量表(CES-D)和学生生活满意度量表(SLSS)为效标工具检验其效标关联效度。结果:①验证性因素分析支持量表的二因素结构模型,中文版结构与原量表一致;②二因子模型各主要拟合指标:RMSEA=0.062;CFI=0.944; TLI=0.925; SRMR=0.042; S-Bχ~2=359.479;DSES-S与DSCS-S、SLSS、CES-D的相关系数分别为0.600、0.382和-0.506(P<0.01);③总量表的α系数为0.854,三周后的重测信度为0.662;④中文版特拉华学生卷入度(学生卷)量表的跨性别等值成立,跨年级组的形态和弱等值成立。结论:特拉华学生卷入度量表(2013版学生卷)(DSESS)中文版具有良好的信效度,等值研究结果表明,量表具有跨性别完全等值性,小学、初中和高中三个年级段间具有完全的形态和弱等值性。谢家树 覃凤荣 George Bear 傅瑶 2019中国临床心理学杂志2019,27,2:4
7ANALYSIS OF COUPLING INFLUENCES OF LABYRINTH SEAL PARAMETERS ON CROSS COUPLED STIFFNESS AND DIRECT DAMPING COEFFICIENT显示文摘Labyrinth seal can cause steam-exciting, the structural and operating parameters of labyrinth seal have effect on stability of rotor-system. For investigating the coupling influences of the structure and operating parameters of labyrinth seals on dynamic coefficients, a model of calculating dynamic coefficients of labyrinth seals is presented using a two control volume model. The coupling influences of parameters on cross-coupled stiffness and direct damping of labyrinth seal are discussed. In the conclusion, a reference of preventing steam-exciting vibration and optimum determination of design parameters of labyrinth seals are provided.Zhou Shouqin, Xie Youbai (Theory of Lubrication and Bearing Institute, Xi’ an Jiaotiong University) 2000Chinese Journal of Mechanical Engineering2000,13,3:3
8特拉华纪律管理量表中文版修订(学生版)显示文摘目的:对特拉华纪律管理量表(学生卷)(Delaware Positive, Punitive, and Social-Emotional Learning (SEL Techniques Scale-Student,DTS-S)2013版进行中文修订。方法:应用中文版特拉华纪律管理量表(学生版)对国内九所中小学校3119名学生施测;以特拉华校园氛围量表(学生卷)(Delaware School Climate Scale-Student,DSCS-S)、特拉华学生卷入度量表学生卷(Delaware Student Engagement Scale-Student,DSES-S)为效标工具检验其效标关联效度,间隔三周后随机抽取其中42名被试进行重测。结果:①验证性因素分析拟合结果表明特拉华纪律管理量表(学生版)采用一阶三因素结构模型最佳,三因素分别为正向性技术、惩罚性技术和社会情感学习(SEL)技术;②特拉华纪律管理量表(学生版)正向性、惩罚性以及SEL三维度与DSCS-S总分的相关系数分别为0.315(P<0.01)、-0.136(P<0.01)、0.373(P<0.01),与DSES-S总分的相关系数分别为0.496(P<0.01)、-0.289(P<0.01)、0.522(P<0.01);③量表各因子的α系数在0.632~0.760之间;三周后的重测信度在0.721~0.772之间;④多组验证性分析结果显示,特拉华纪律管理量表(学生版)跨性别的等值成立,跨年级的形态等值、弱等值和部分强等值成立。结论:特拉华纪律管理量表(学生版)中文版具有良好的信效度,等值研究结果表明,量表具有跨性别的完全等值性,初中、高中两个年级段间存在部分等值性。谢家树 林欣欣 覃凤荣 Chunyan Yang George Bear 2019中国临床心理学杂志2019,27,3:3
9A signature of immune function genes associated with recurrence-free survival in breast cancer patients显示文摘Maria Libera Ascierto Maciej Kmieciak Michael O. Idowu Rose Manjili Yingdong Zhao Margaret Grimes Catherine Dumur Ena Wang Viswanathan Ramakrishnan Xiang-Yang Wang Harry D. Bear Francesco M. Marincola Masoud H. Manjili 2012Breast Cancer Research and Treatment2012,,3:2
10Soil organic matter and texture affect responses to dry/wet cycles: Effects on carbon dioxide and nitrous oxide emissions显示文摘T. Harrison-Kirk M.H. Beare E.D. Meenken L.M. Condron 2013Soil Biology and Biochemistry2013,,:2
11ELASTOHYDRODYNAMIC LUBRICATION OF LOGARITHMIC PROFILE ROLLER CONTACTS显示文摘An account of numerical solutions to the isothermal and flooded elastohydrodynamic lubrication(EHL)of a logarithmic profile roller,which is rolling over a flat plane,is given The analysis takes account of sideways flow of lubricant in the inlet region of the contact When the results are presented in suitable non dimensional groups,it is shown that more uniformly pressure and shape of the film distributing in axial direction is taken place under light loading As the increase of the load,the end closure is displayed and the oil pressure rises sharply at the ends The seal action formed by the end closure makes the film thickness a little And the minimum film thickness is transferred from the central to the ends and the value is reduced rapidly As the increase of the speed,the end closure becomes much serious The optimum crowning value obtained in EHL state is larger than the design value obtained in elastostatic contact state for the same working conditions In order to verify the correctness of theory,optical interferometry is applied to measure the oil film thickness between a logarithmic profiled roller and a glass plate under pure rolling conditions It is found the agreement between numerical solutions and experiments is very good.Chen Xiaoyang, Shen Xuejin (Research Institute of Bearings,Shanghai University) Xu Wen, Ma Jiaju (Zhejiang University) 2001Chinese Journal of Mechanical Engineering2001,14,4:2
12旋转电机通风损耗的计算与测量显示文摘电站越来越强调机组的高效率,对开路损耗的注意力也在增加,因为在负荷不满的运行状态下,开路损耗的影响很大,制造厂应用改进的测试技术做了范围广泛的开发试验,以便更深入地掌握电机的通风问题,在这一领域内获得了新的知识,并开发了先进的计算机软件,本文介绍ABB公司确定旋转电机通风损耗(空载损耗的主要部分)和在试验室或电站现场精确测量这些损耗的经验。不论是建造新电站还是改造老的发电机。Bear,J 李琛 1994国外大电机1994,,1:2
13PSF acts through the human immunodeficiency virus type 1 mRNA instability elements to regulate virus expression显示文摘Zolotukhin A S Michalowski D Bear J 2003Mol Cell Biol2003,23,:2
14Preoperative chemotherapy : updates of National Surgical Adjuvant Breast and Bowel Project Protocols B 18 and B 27 显示文摘Rastogi P Anderson SJ Bear HD 2008JClin Oncol2008,26,77:1
15A Monetarist Model of Reginal Business Cycles显示文摘Beare J B 1976Journal of Regional Science1976,16,:1
16Aqueous sonolytic decomposition of polycyclic aromatic hydrocarbons in the presence of additional dissolved species显示文摘LAUGHREY Z BEAR E JONES R 2001Ultra Sonochem2001,8,4:1
17Sequential preoperative or postoperative docetaxel added to preoperative doxorubicin plus cyclophosphamide for operable breast cancer:National Surgical Adjuvant Breast and Bowel Project Protocol B-27显示文摘BEAR H D ANDERSON S SMITH R E 2006J Clin Oncol2006,24,13:1
18Amylose content 显示文摘VINEYARD M L BEAR R P 1952Maize Genet Coop News Lett1952,26,:1
19Water- stable aggregates and organic matter fractions in conventional and notillage soils 显示文摘BEARE M H HENDRIX P F COLEMAN D C 1994Soil Science Society of America Journal1994,58,3:1
20Genetic diversity ofthe Q fever agent,Coxiella burnetii?assessed by micro ar-ray-based whole-genome comparisons 显示文摘Beare PA Samuel JE* Howe D 2006J Bacteriol2006,188,7:1
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