10 research outputs found

    考虑随机制造误差的差减速器齿轮副振动特性分析

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    为研究随机制造误差对某新能源汽车差减速器齿轮传动系统振动特性的影响,采用拉格朗日能量法建立差减速器齿轮副在多源时变激励作用下的弯—扭—轴耦合振动动力学模型。将齿轮系统的齿廓总偏差和基节偏差作为随机变量,采用服从正态分布规律的随机变量描述,运用数值仿真软件对差减速器传动系统进行动力学分析。结果表明,随着随机制造误差离散程度的逐渐增加,齿轮副轴向振动幅值逐渐加剧;但对于齿轮副径向振动未产生较为明显的改变

    智能扫地机滚刷齿轮箱的振动特性仿真分析及试验研究

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    针对某款扫地机齿轮箱噪声过大的问题,在多体动力学软件RecurDyn中建立齿轮箱动力学模型,得到稳态工况下齿轮副的动态啮合力,分析了啮合力对箱体振动的影响;利用Ansys对箱体进行模态和动态响应分析,显示振动响应峰值主要集中在齿轮啮合频率的基频、倍频、2倍频处,激起了与齿轮副的共振噪声。为避开共振带,在不增加箱体空间的情况下提出优化齿轮几何参数和改进电动机装配处结构的方案,并对优化方案进行了噪声试验。结果表明,优化齿轮几何参数和对电动机装配处加筋的组合方案为最佳方案,整机噪声降低了约8.9 dB。研究对该类产品的优化设计和减振降噪具有一定的研究意义和参考价值

    主动靶向型小干扰核糖核酸输送载体及其制备方法

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    本发明公开了一种主动靶向型小干扰核糖核酸输送载体,由作为载体骨架的可生物降解的高分子化合物分别与作为载体侧链的靶分子和氨基化合物共价偶联得到。该载体能与siRNA自组装形成复合物纳米粒,将siRNA紧密包裹起来,防止核酸酶对siRNA的降解。另外,该载体中的靶分子能与肿瘤细胞表面的抗原或受体发生特异性相互作用,从而实现将载体-siRNA复合物纳米粒精准地靶向输送至肿瘤部位,通过抗原或受体介导的细胞内吞作用进入癌细胞,在胞内通过siRNA诱导基因沉默复合物的生成,序列特异性降解mRNA,使目的蛋白表达量下调,从而达到杀死癌细胞,实现治疗肿瘤的目的。本发明还提供了该主动靶向型小干扰核糖核酸输送载体的制备方法

    农业资源高效利用与管理技术

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    该课题建立了区域农业资源利用效率评价指标体系与评价模型,首次编制了中国农业生态区划方案,建立了农业资源高效利用决策支持系统,在农业资源高效利用研究的理论与方法方面取得了重要进展。系统分析了中国的农业资源态势和发展前景,提出了以县为单元的商品粮基地建设构想,综合评估了中国不同时期、不同生态区的农业资源综合生产能力和人口承载能力,总结提出了适宜不同类型区的14种农业资源高效利用优化模式与技术体系集成方案和21项节水、节地、节肥、节粮、节本的高效利用农业资源的技术创新组合方案,具有一定的推广应用价值;研究提出的藏粮于土、提高农业资源综合生产能力的相关结论和建议,对国家和地区农业资源高效利用与区域可持..

    Expertadvice on the diagnosis and intervention of Chinese developmental dyslexia

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    发展性阅读障碍是一种以儿童阅读能力显著落后于年龄和智力应有水平为主的障碍,属于具有遗传基础的神经发育性障碍。目前国内对发展性阅读障碍的评估、诊断与干预多出现在科研场合,临床诊疗和教育性质的应用明显不足。专家意见采用专家书面反馈意见和视频会议讨论的形式,以发展性阅读障碍的病因学基础为指导,对发展性阅读障碍的临床表现、诊断流程及干预原则等形成统一意见,旨在为相关专业领域医师和康复专业人员提供参考和帮助,亦为开展对发展性阅读障碍的教育性干预活动提供参考。</p

    Ziprasidone versus other atypical antipsychotics for schizophrenia

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    JUNO Sensitivity on Proton Decay pνˉK+p\to \bar\nu K^+ Searches

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in pνˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel

    JUNO sensitivity on proton decay pνK+p → νK^{+} searches

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    JUNO sensitivity on proton decay p → ν K + searches*

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the pνˉK+ p\to \bar{\nu} K^+ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+ p\to \bar{\nu} K^+ is 36.9% ± 4.9% with a background level of 0.2±0.05(syst)±0.2\pm 0.05({\rm syst})\pm 0.2(stat) 0.2({\rm stat}) events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is 9.6×1033 9.6 \times 10^{33} years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies
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