11 research outputs found

    传输网定时同步和互联网时间同步

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    传输网的定时同步是电信网络的物理层需求,而互联网的时间同步则是通过应用层上网络时间协议(NTP)来实现,服务于互联网上的应用层需求。两者的网络结构、实现和功能均有很大不同

    Assembly line conveying vehicle

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    本发明属于装配线输送车领域,具体地说是一种装配线输送车。它包括作为主框架的车体、卡具、驱动装置,安全防撞机构,运动轮系;具有单轨导引结构,运动轮系为复合运动轮系,安装在所述单轨上;其中:车体上部连接卡具、下部连接驱动装置,在车体前端配有安全防撞机构,驱动装置通过联轴器与复合运动轮系相连。本发明克服了现有输送方式的缺点和不足,同时又兼备现有技术中几种形式输送车的优点,很好地解决了长期以来装配生产线没有理想输送车的问题。本发明地面布局简洁通过性好、有利于工人装配作业,同时具有较好的整体形象。还具有造价及运行成本低、自动化程度高、适合高水平装配生产线应用等特点

    一种缓速器检测试验平台

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    本发明属于检测技术领域,特别涉及一种缓速器检测试验平台。包括基础床身平台及设置于基础床身平台上并且依次连接的驱动动力单元、驱动传递部件、惯性轮单元、转速扭矩检测单元及齿轮箱自动充放油装置,齿轮箱自动充放油装置用于与缓速器连接,为缓速器提供动力。本发明的各个系统相互组合,实现了功能的集成化;充分考虑人机关系可操作性好;自动化技术应用,数据自动分析,实现自动化检测试验技术

    一种气密检测手动测量头装置

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    本发明涉及一种气密检测设备,特别涉及一种气密检测手动测量头装置。测量头体、橡胶密封件、弹性复位机构、测量头座组件及手柄驱动组件,其中测量头体贯穿测量头座组件、且相对测量头座组件可伸缩,手柄驱动组件安装在测量头座组件上、且与测量头体的上端连接,手柄驱动组件用于驱动测量头体伸出,测量头体的下端端部设有凸台,橡胶密封件套设于测量头体上、且位于凸台和测量头座组件之间。弹性复位机构套设于测量头体上、且容置于测量头座组件内,弹性复位机构用于驱动测量头体缩回,测量头体端部的凸台挤压橡胶密封件变形,从而实现对密封测量体的密封。本发明结构简单、工作性能可靠、操作简便、实用性强

    25MeV/u Kr辐照下PET薄膜的损伤机制研究;Damage Mechanism of PET Irradiated by 25 MeV/u Kr Ions

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    通过25MeV/u86Kr离子辐照叠层结晶聚对苯二甲酸乙二醇酯膜(PET),在不同的电子能损(3.407.25keV/nm)和离子注量(5×10113×1012ions/cm2)辐照条件下,对Kr离子在PET中引起的辐照损伤效应进行了研究。借助傅里叶变换红外光谱分析,通过对样品的红外吸收峰进行扣除基底后的Lorentz拟合,分析了与主要官能团对应的吸收峰强度的变化趋势,研究了化学结构与组分在重离子辐照下的变化规律;利用X射线衍射光谱仪测量,研究了Kr离子在PET潜径迹中引起的非晶化过程,并通过对吸光度和非晶化强度随离子注量的指数衰减规律的分析,获得了不同电子能损离子辐照PET时主要官能团的损伤截面和非晶化截面及对应的潜径迹半径

    Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

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    We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

    Determination of the number of ψ(3686) events taken at BESIII

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    The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^

    Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024*

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