9 research outputs found

    基于有限元法的疲劳点蚀斜齿轮时变啮合刚度分析与试验研究

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    疲劳点蚀斜齿轮啮合刚度计算是齿轮故障动力学分析的重要基础。基于有限元的斜齿轮啮合刚度计算方法,建立了正常齿轮和疲劳点蚀齿轮的有限元模型。通过有限元模型计算,得到了齿面法向接触力和综合弹性变形量;并根据啮合刚度计算方法,得到了齿轮的单齿啮合刚度和多齿综合啮合刚度。分析不同点蚀剥落长度和宽度对齿轮啮合刚度的影响得知,剥落长度和宽度对齿轮啮合刚度影响较大;而且剥落长度会影响齿轮啮合刚度的变化区域。通过疲劳点蚀试验证明,齿轮啮合刚度的减小使得齿轮振动冲击响应增大

    射频反应溅射制备的ZnO薄膜的结构和发光特性

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    用射频反应溅射在硅(100)衬底上生长了c轴择优取向的ZnO薄膜,用X射线衍射仪、荧光分光光度计和X射线光电子能谱仪对样品进行了表征,分析研究了溅射功率、衬底温度对样品的结构和发光特性的影响.结果表明,溅射功率100W,衬底温度300~400℃时,适合c轴择优取向和应力小的ZnO薄膜的生长.在样品的室温光致发光谱中观察到了380nm的紫外激子峰和峰位在430nm附近的蓝光带,并对蓝光带的起源进行了初步探讨

    灵境卫士:基于ACP的网络安全平行监管研究

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    网络安全起源于计算机网络的理论测试,而随着信息与通信技术的发展,网络安全风险呈现出来源广(volume)、方式多(variety)、过程隐(visibility)与损失高(value)的“4V”特性,与之相伴的是网络空间形态与复杂度的双重变化。近期兴起的元宇宙风潮,使以人为中心构建出的网络空间拥有映射出真实世界的能力,也将真实世界暴露在网络安全风险之下。然而,网络安全监管没有跟上网络空间的变化,仍然在网络空间中寻求解决之道。介绍了一种网络安全平行监管系统——灵境卫士,它基于人工系统、计算实验与平行执行的ACP方法搭建,从信息-物理-社会系统(cyber-physical-social systems,CPSS)的视角改善当前网络安全监管的窘境。展示了灵境卫士在电信反诈骗与工业物联网场景下的应用方案,为其在不同领域的网络安全监管工作提供启发与借鉴

    首次在中国发现圈养环尾狐猴感染肥头绦虫

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    首次在中国报道1例由长颈囊尾蚴(Cysticercus longicollis)引起的5岁雄性圈养环尾狐猴(Lemur catta)皮下囊尾蚴病,患病动物表现为明显的臀部囊肿,但无其他异常体征。该病例就诊于四川农业大学第二教学动物医院。在就诊期间,采用细针穿刺对囊肿内容物进行形态学检查。结果显示:囊肿内含有大量囊尾蚴,典型囊尾蚴呈椭圆形,具有长而可伸缩的颈部和单个头节,头节上有4个吸盘和16个(单排)小钩。通过对囊尾蚴DNA进行nad1和cox1基因扩增及测序,进一步确定该囊尾蚴为肥头绦虫(Taenia crassiceps)的幼虫形态,即长颈囊尾蚴,研究结果可为该寄生虫在国内的流行病学调查及防控提供参考

    RETGEM探测器的初步测试

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    研制了一种新型的带有阻抗性电极的TGEM——RETGEM(Thick GEM with Resistive Electrodes)探测器,阻抗性电极可以有效地保护探测器和前端电子学免于偶尔放电的损伤。对RETGEM探测器进行了初步测试,其中包括计数率、能量分辨、增益以及打火率。结果表明,探测器达到了设计的基本要求

    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 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

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

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