摘要：In order to satisfy the requirements of beam measurement in the heavy ion medical machine and other small nuclear physics experiments, we designed and built a nuclear instrumentation module-based data acquisition system. This is composed of a set of functional modules and a purpose-built bus. One of the modules operates as a master, collecting data from the other slave modules. It then sends the data to the back-end computer via *** addition to the hardware, dedicated software has been designed and implemented. In this paper, we provide a detailed description of the architecture of the system, the data frame, and the software. The bus is the central part of the system. It can transmit data from the slave modules to the master at 33 MB/s. The frame used to transmit the data also ensures its integrity and monitors the hardware architecture. The client software is designed to process data in real time and store data on a hard disk for later analysis.

摘要：To improve the accuracy and usability of the superconducting electron cyclotron resonance ion source with advanced design in Lanzhou(SECRAL), an upgraded version of the control system was designed and tested. This paper details the architecture of the optimized control system and presents the results of its use in the long-term operation of the accelerator. The control system software, based on Visual C++, was developed following the model-view-controller architecture design pattern. The data acquisition system was based on a field-programmable gate array integrated circuit. In addition, control strategies were optimized for higher operational stability. The upgraded control system was tested with a U^(33+) ion beam at SECRAL, where it provided a data acquisition time of less than 1 ms. The fast reaction time and highprecision data processing during beam tuning verified the stability and maintainability of the control system.

摘要：超2000 m级悬索桥已超过现行桥梁设计规范的适用范围,传统安全系数法仅从均值或标准值角度反映设计安全度,未能真实反映抗力小于荷载导致失效的概率或风险。基于荷载、抗力以及设计关键参数的数据统计特征与变异性,利用可靠度分析理论,对悬索桥重力式锚碇滑移构建承载能力极限状态设计方程,重点计算基于目标可靠度的抗力项分项系数合理取值,并推导目标可靠度等效的抗滑安全系数表达式。最后以主跨2300 m世界第一跨径悬索桥为背景工程,构建超大跨径悬索桥重力式锚碇抗滑实用设计表达式,并与传统安全系数设计方法进行安全度对比分析。结果表明:利用极限状态(分项系数)设计方法,与现行规范锚碇设计方法相比,可显著降低超大跨径悬索桥重力式锚碇抗滑设计等效安全系数取值,大幅提升其安全设计的科学性与经济性,并为编制超2000 m级悬索桥设计规范提供基础理论与技术支撑。

摘要：防淹设计是地下污水处理厂安全设计的重中之重,以华中地区第一座全地下污水处理厂——铁路桥地下净水厂为例,针对其水淹风险来源,详细介绍了其在防淹方面的设计。铁路桥地下净水厂除常规结构防水、建筑防雨、厂区排水、溢流控制、水位监测等防淹设计外,更核心的是结合全重力流进水特点,设计进水流量精准控制、进水口紧急关闭、双回路供电等防淹系统。结合一年多的运行情况可知,面对厂区突发状况,防淹设计发挥了重要作用,有效避免了净水厂的水淹风险,可为其他类似项目提供借鉴。

摘要：道路石油沥青在加工和使用过程中,会持续释放出大量具有毒性和致癌性的挥发性有机化合物(volatile organic compounds, VOCs),这些气体会对环境和人类造成严重危害。归纳了境内外研究成果,总结了道路石油沥青VOCs的主要成分;从环境及人类健康角度探讨了道路石油沥青VOCs的危害;综述了不同环境特征下道路石油沥青有害气体的释放机理;最后,将道路石油沥青生命周期分为4个阶段,对道路石油沥青全寿命周期VOCs的排放特征进行了分析;在此基础上,提出完善评价道路石油沥青VOCs危害的统一标准、从微观角度探究其释放机理、研发在开放环境中准确测量VOCs组成和浓度的测量方法是目前亟待解决的问题。

摘要：本文通过借助CAE仿真分析手段,对某树脂行李箱开发设计阶段的产品翘曲变形情况和负载变形情况,进行了仿真量化分析。基于分析得出的各因素对产品尺寸变形的影响数值,在数据结构和模具上进行了相应的预变形设计,来消除翘曲和负载对树脂行李箱产品装配尺寸的影响。最终通过将设计数据与模具件的对比印证,成功解决了树脂行李箱的翘曲变形和负载变形,提高了行李箱总成实物样品的尺寸与设计尺寸的一致性。

摘要：针对某型航空齿轮泵在极端温度环境下的工作特性测试需求,设计了一套液压泵高低温性能测试方案,并搭建测试试验台架,完成齿轮泵高低温性能测试。结果表明,被试泵的流量-压力特性满足技术指标要求,液压泵的容积效率与工作温度及加载压力成反比。

摘要：为研究楚雄烟区烤烟新品种‘NC297’的配套栽培措施,确定楚雄烟区烤烟‘NC297’适宜的种植密度和留叶数,设计3个水平的种植密度和留叶数的正交试验。试验结果表明,密度13800株/hm^(2),留叶18片处理有最大的株高、叶长、叶宽。黑胫病、青枯病、气候斑、普通花叶病病情指数在中低密度处理下显著低于高密度的对照组。低密度处理净光合速率、CO_(2)浓度、气孔导度、蒸腾速率均处于较高水平。种植密度15100株/hm^(2)、留叶数20片外观质量表现最佳,密度13800株/hm^(2)、留叶18片处理次之。密度13800株/hm^(2)、留叶18片/株的处理均价和中上等烟比例显著最高,产量较高,产值仅次于种植密度16600株/hm^(2)、留叶18片/株的处理。密度13800株/hm^(2)、留叶18片/株的处理烟叶化学成分最协调,总分最高。综合本试验结果来看,烤烟‘NC297’在楚雄烟区的适宜种植密度为13800株/hm^(2),适宜的打顶留叶数为18片/株。

摘要：The design and construction of highly effective circularly polarized luminescence(CPL)-active materials has aroused considerable attention due to their widespread applications in sensors,optical devices,and asymmetric ***,the exploration of novel CPL-active materials with high luminescence dissymmetry factor(glum)values is still a ***,we describe a new approach for the preparation of supramolecular metallacycles with amplified CPL promoted by hierarchical self-assembly involving Pt···Pt ***,the resultant metallacycles exhibited strong CPL signals with high glum values,while their corresponding precursors were CPL *** CPL amplification mechanism was comprehensively validated by ultravioletvisible absorption,emission spectroscopy,nuclear magnetic resonance spectroscopy,scanning electron microscopy,transmission electron microscopy,atomic force microscopy,coarse-grained molecular dynamics simulations,and timedependent density functional theory *** work thus provides the first example of preparing highly effective CPL-active materials based on hierarchical self-assembly involving Pt···Pt interactions.

摘要：非线性冲击负荷会对计量点的电流、电压及频率产生较大影响,会引起较严重的电能计量误差。在分析非线性冲击负荷对计量误差影响的基础上,建立了冲击负荷模型,给出较为精确的冲击负荷仿真方法,据此给出了新型冲击负荷电能表的设计方案和设计原理;设计了电压、电流高速AD采样电路,给出了零磁通电流互感器设计方法;提出了一种冲击负荷计量方法及算法思路,给出了基于IIR低通滤波器的冲击负荷滤波算法及具体参数,设计出新型冲击负荷电能表。在冲击负荷模型的基础上,设计了冲击负荷典型实验环境,分别在暂态冲击负荷、短时冲击负荷、长时冲击负荷等条件下对待测冲击负荷电能表进行实验,实验结果表明,所设计的新型冲击负荷电能表能准确计量冲击负荷电能。