Results 21 to 30 of about 56,338 (159)
Model Motion Control Simulation and Implementation of WDPSS Support in Wind Tunnel Test [PDF]
, 2015 摘要 绳牵引并联机构WDPSS是一种新型低速风洞试验的模型支撑系统，其因灵活度高、模型支撑刚度大、对流场干扰小等诸多优点而逐渐被认识和认可。本文针对该机构进行了运动控制的建模与仿真，根据风洞试验的要求开发了控制系统相关功能模块，并对视觉系统采集信号进行了有效滤波，为将WDPSS的工程应用奠定了基础。本文完成的研究工作与成果如下所述。 首先，针对WDPSS-8原理样机，进行了运动学与动力学分析。通过运动学逆解分析得出绳长与飞机模型位姿之间的关系，根据驱动系统结构特点建立其动力学模型，利用牛顿 ...
王义龙
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Powerful representation of the poor? German welfare associations' narrative advocacy during COVID‐19
Policy Studies Journal, EarlyView.Abstract The COVID‐19 pandemic sparked unprecedented experimentation in the German social assistance system, leading to changes previously considered impracticable by policymakers. This included a sanctions moratorium, easier access to benefits, and temporary cash transfers, all of which were advocated by welfare associations—key organized interests ...
Christopher Smith Ochoa
wiley +1 more source
Rope Elastic Influence and Aerodynamic Parameter Measurement in Wind Tunnel of WDPSS-8 [PDF]
, 2016 风洞试验是获取飞行器性能参数的重要手段，相对于传统的硬式支撑方式， 绳索牵引并联机构作为一种新的支撑系统，具有惯性小、结构刚度高、负载能力 强、对流场影响小等优点。本文针对绳索牵引并联支撑系统在风洞试验中的应用， 重点分析了牵引绳弹性形变对飞行器模型运动位姿精度的影响及误差补偿策略； 结合课题组建立的原理样机进行了风洞试验，对利用绳拉力解算气动参数的方法 进行了理论分析和试验验证，主要工作及成果如下所述。 首先，描述了系统构成及应用参数，建立了运动学和动力学模型，并对机构 进行了刚度分析 ...
马少宇
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Review of Policy Research, EarlyView.ABSTRACT Public appointments shape the top‐level bureaucracy by serving as a gateway for professionals with different profiles, chosen based on different criteria. In general, the literature has been more interested in analyzing appointments based on merit or sponsorship, based on verification of loyalty to the government or technical competence ...
André Vaz Lopes +1 more
wiley +1 more source
, 2012 [目的]研究十字花科与豆科作物对微囊藻毒素(MC)耐受性的差异。[方法]以十字花科作物典型作物油菜、小白菜、甘蓝与豆科典型作物黄豆、豌豆、蚕豆为材料,检测它们在不同浓度MC暴露条件下的生长发育情况,检测指标包括发芽率、株高、叶绿素等。[结果]十字花科作物中油菜与小白菜受MC影响较大,甘蓝受影响较小,而豆科作物普遍受影不大。[结论]豆科作物比十字花科作物对MC耐受性更强 ...
刘剑彤, 刘碧波, 吴烨
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Veterinary Dermatology, Volume 37, Issue 2, Page 236-246, April 2026.Canine atopic dermatitis (cAD) is a chronic condition requiring life‐long management. Accurate diagnosis can be challenging, with no reliable diagnostic test. This study aimed to generate a simple diagnostic model for cAD. This model is a relevant prototype for an app‐based tool to support general practitioners in the diagnosis of cAD alongside ...
Xavier Langon +2 more
wiley +1 more source
Dianci bileiqi, 1986 本文叙述了RXQ型电压互感器消谐器的保护原理。此消谐器既能消除中性点不接地系统中由电压互感器(PT)的非线性励磁特性所引起的过电压,又能抑制由弧光接地所引起的流过PT的过电流,进而防止了PT的烧毁。文中提出了与经典理论不同的谐振范围曲线,论证了消谐器的参数与技术要求,介绍了运行情况,并与国内数种消谐器作了有关比较。
1.西北电力试验研究所 +2 more
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, 2012 以水稻、高粱和玉米为研究对象,考察了微囊藻毒素对受试作物的毒性差异,研究了不同浓度MC对萌发及萌发初期生长发育的影响,不同灌溉时期对受试作物生长发育的影响,检测指标包括发芽率、株高、鲜重、叶绿素、根系活力等。结果表明,受试作物对微囊藻毒素毒性并不一致,水稻发芽率受到明显抑制,高粱发芽率基本不受影响,玉米出现了低浓度促进、高浓度抑制的现象;MC对水滔、高粱和玉米的光合作用、株高和鲜重没有抑制作用,反而有一定的促进效果;不同灌溉时间条件下的研究结果表明,萌发前对高粱和玉米染毒会明显抑制植株根系活力 ...
刘剑彤, 刘碧波, 吴烨, 耿俊杰
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Veterinary Dermatology, Volume 37, Issue 2, Page 247-256, April 2026.ABSTRACT Background Identification of offending foods in dogs with adverse food reactions is usually based on “deterioration” during open food challenges. Objectives To examine the placebo effect during double‐blinded, placebo‐controlled food challenges using a predefined set of criteria for relapse.
Evi I. Sofou +4 more
wiley +1 more source
Dianci bileiqi, 1976 本文介绍电瓷原料中的铁对原料颜色的影响,原料中的铁在贮存和加工中发生化合、分解反应,以及铁质在烧成中的主要反应和对瓷体的颜色和性能的影响。
抚顺电瓷厂试验室
doaj