电液3-UPS/S并联稳定平台参数振动特性分析

针对电液3-UPS/S并联稳定平台驱动液压缸的压力脉动所产生的参数振动,建立了稳定平台的参数振动方程并利用多尺度法求解了主共振响应与组合共振响应的一次近似解;分析了主共振与组合共振响应特性以及振动幅值在初始工作空间内的变化规律,最后采用四阶龙格库塔法与模态试验对参数振动模型进行验证。结果表明:数值解与理论解之间的最大误差为4.20%,固有频率理论值与试验值之间的最大误差为4.66%,可验证参数振动模型的正确性。

Tilt-up建筑波纹钢板屋盖平面内抗震设计方法研究

Tilt-up建筑体系是一种由钢筋混凝土墙板、屋盖、内部承重柱组成的“盒式”受力体系。屋盖作为重要的结构构件,不仅承受平面外荷载,还承受由地震作用产生的水平力。论文分析了屋盖平面内受力机理,介绍了美国ASCE 7规范、IBC规范中Tilt-up结构波纹钢板屋盖平面内抗震设计方法,对华盛顿地区某Tilt-up建筑波纹钢板屋盖进行了设计研究,为我国引入Tilt-up建筑体系提供参考。

基于NB-IoT的UPS智能在线监测系统的设计

针对UPS机房在运行过程中无人监守,工作人员无法及时排查故障的问题,设计并实现了一套基于ARM和NB-IoT的UPS智能在线监测系统,由检测终端、云服务器和监管中心组成;检测终端使用各类传感器和检测电路获取多个UPS设备的输入输出电压和电流、负载率、蓄电池电量等数据以及机房温湿度环境参数,通过无线模块发送给云服务器,监管中心从云服务器获取数据,用户可以登录监管中心远程查询UPS的工作数据;经测试,系统能够实现对UPS各项数据的采集和无线传输,可以通过监管中心实时查询UPS工作状态以及下发指令,能达到实时监控的效果;具有数据测量准确,实时性响应良好等特点,减少了管理人员的工作量,提高了UPS的管理效率。

综合性医院UPS选型及运维关键问题探讨

通过文献研究法,根据应用场景差异,设计UPS选型流程,明确选型策略,同时借助信息化手段,以全生命周期运维为思路,在医院后勤智慧运维平台架构上拓展UPS运维模块,设计UPS巡检方案并实施,解决了UPS选型及运维过程中存在的问题,提升了运维效能。

广播电视制播工程项目中UPS的选用研究

对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电源设备技术架构成为一个关键问题。主要探讨了广播电视制播工程项目中UPS电源设备的选用,对UPS高频机和UPS工频机进行了比较分析,进而给出了广播电视制播工程中UPS电源设备的选用策略。

基于UPS策略自我训练的半监督语义分割

为提高半监督语义分割的效果,文章提出一种损失归一化技术结合UPS策略的半监督语义分割网络SPNS。利用损失归一化技术缓解标准损失函数的自我训练不稳定问题;UPS策略是结合不确定性估计和消极学习的技术,通过计算输出值的不确定性作为另一种阈值,用以挑选可靠的伪标签,最后利用生成的伪标签和标记数据完成半监督语义分割任务。SPNS方法在PASCAL·VOC数据集上相对于只使用标记数据训练有着+2.06的效果提升,与其他方法相比也有一定提升。

基于电子电路原理的UPS故障分析与解决方案研究

不间断电源(Uninterruptible Power Supply,UPS)作为电力保障系统的重要组成部分,在现代电力系统中扮演着至关重要的角色。然而,由于UPS具有复杂的电子电路结构,在实际运行中常常面临各种故障问题,不仅影响系统的可靠性和稳定性,而且可能导致重大的经济损失和安全风险。因此,深入分析UPS故障,并提出有效的解决方案具有重要意义。文章通过研究基于电子电路原理的UPS故障分析与解决方案,梳理相关理论和实践经验,为UPS故障诊断与维修提供参考与指导。

Method Development and Validation of the Simultaneous Analysis of Methylisothiazolinone, Methylchloroisothiazolinone, Benzisothiazolinone and Bronopol in Washing-Up Liquid

A method of analysis for the simultaneous determination of methylisothiazolinone (MI), methylchloroisothiazolinone (CMI), benzisothiazolinone (BIT) and Bronopol (BNP) in washing-up liquid was established. The method consisted of a gradient HPLC analysis at three different wavelengths. The four compounds could be analyzed with good precision and accuracy.

城市轨道交通通信系统UPS故障及维护

不间断电源(Uninterruptible Power Supply,UPS)是一种提供稳定电力供应的设备,当主电源中断或电压异常时,它能立即切换到备用电源,保证设备持续供电,避免设备损坏和数据丢失。要注意安装稳定的电源设备,维护UPS控制器和软件以及定期检查和维护电池等。通过维护管理措施,可以确保UPS稳定运行,延长设备寿命,保障通信系统的正常运行和数据传输。

Environmental Impact Assessment Follow-Up of Seismic Survey Offshore Activities in Brazil

Follow-up of environmental impacts is an integral part of the Environmental Impact Assessment (EIA) process, closely related to the effectiveness of the instrument. EIA follow-up has been receiving a lot of interest from scientists and practitioners, though it is recognized as one of the weakest points of EIA systems globally. Also, EIA follow-up is influenced by the context, mainly in terms of the types of projects or activities and their related impacts on the environment. Therefore, the present paper is focused on the investigation of the follow-up stage applied to the activity of seismic survey coupled with offshore oil & gas exploitation in Brazil. Research was based on a qualitative approach that included document analysis and semi-structured interviews with analysts involved in EIA processes, and sought to generate evidence of effectiveness of the EIA follow-up as conducted by the Federal Environment Agency (Ibama) in order to situate the practice of follow-up in the broader context of international best practice principles. Based on the findings, it was concluded that, due to the peculiarities of offshore seismic survey, it is necessary to promote adaptations in the procedures for monitoring impacts in order to ensure proper alignment with the principles and conceptual foundations that guide EIA practice. Specifically, the timing of the execution of the activity imposes challenges for its integration into the “conventional” cycle that has guided the monitoring of the impacts in the EIA of projects.

高频UPS和锂电池应用于半导体工厂的多元化评价

文章介绍了高频UPS和锂电池在半导体工厂实际负载工况应用场景下的性能测试。从供电可靠性、安全高效、易扩容、易维护等方面评估了高频模块化UPS,说明了高频模块化UPS应用于半导体晶圆制造厂中,对含有冲击性电流的感性负载的良好适用性。

Parent-Reported Reasons for Loss-to-Follow Up in Patients Hospitalized at the Neonatology Unit at Laquintinie

Introduction: Despite the known benefits of newborn follow-up clinics, attendance has historically been difficult. Infants with reported follow-up difficulty have a greater incidence of severe sensorimotor and cognitive deficits and poorer access to early intervention programs. Our objective was to determine the parent-reported reasons for loss-to-follow up in patients hospitalised at the neonatology unit of Laquintinie Hospital. Methodology: We carried out a cross-sectional study through phone interviews with parents/caregivers of patients hospitalised at Laquintinie over a 2-year period from 1st January 2021 to 31st December 2022. A non-standardised structured interview guide was used for data collection. Loss-to-follow up referred to absence to at least one visit as recorded in the neonatal follow-up chart. All necessary administrative and ethical considerations were duly respected. Results: Most neonates were born through vaginal delivery (n = 313, 69.45%). The neonates were admitted at a median gestational age of 33 weeks (Q1-Q3;32 - 35) and the median duration of hospitalisation was 12 days (Q1 - Q3;8 - 18). A total of 23 neonates had died at the time of interview giving a mortality rate of 5.1%. The three most reported reasons for loss-to-follow-up was lack of money (n = 310, 68.13%), assumption that follow-up had ended (n = 37, 8.13%), and newborn that died (n = 23, 5.1%). Conclusion: This study highlights the significant impact of financial constraints and absence of a robust follow-up system on poor uptake of neonatal follow-up post-discharge in resource limited settings like Cameroon. Our results serve as advocacy for national health insurance especially in neonates.

UPF1影响AU565乳腺癌细胞侵袭、迁移及EMT的机制

目的 探讨上游移码蛋白1(UPF1)对人乳腺癌细胞AU565侵袭、迁移及上皮间充质转化(EMT)的影响及机制研究。方法 收集2021年9月—2022年3月于我院接受乳腺切除术43例乳腺癌患者新鲜癌组织及正常乳腺组织,制备石蜡块,免疫组织化学法检测UPF1表达情况。购置人乳腺癌细胞系AU565及人乳腺上皮细胞系DU4475,激光共聚焦扫描显微镜法测定UPF1水平。采用小干扰RNA(siRNA)技术构建UPF1低表达的重组细胞,分析转染siRNA-UPF1对AU565细胞侵袭、迁移能力以及EMT相关蛋白表达和蛋白激酶B/哺乳动物雷帕霉素靶蛋白(Akt/mTOR)信号通路的影响。结果 乳腺癌组织UPF1的吸光度值显著高于正常乳腺组织(P<0.05)。AU565细胞UPF1荧光强度显著大于DU4475细胞(P<0.05)。与siRNA-NC组比较,转染siRNA-UPF1后AU565细胞中UPF1蛋白及mRNA表达水平均显著降低(P<0.05)。与siRNA-NC组比较,转染siRNA-UPF1后AU565细胞穿膜率和细胞迁移率均显著增加(P<0.05)。转染siRNA-UPF1后AU565细胞E-candherin蛋白表达水平显著降低,Vimentin和N-cadherin蛋白表达水平显著升高(P<0.05)。转染siRNA-UPF1后AU565细胞p-Akt和p-mTOR水平显著升高(P<0.05)。结论 UPF1在乳腺癌中表达上调,但沉默UPF1可能通过激活Akt/mTOR通路传导,促进乳腺癌细胞AU565的侵袭和迁移,并诱导EMT发生。

化工仪表UPS配置管理及维护探讨

不间断电源(UPS,Uninterrupted power supply),由电力变流器、储能装置(如蓄电池)和开关(电子式、机械式或混合式)等组合而成,在供电中断后能持续一定供电时间的电源设备[1]。随着技术的发展,UPS不间断电源应用范围逐渐扩大,特别在电信、石油、化工等领域得到了广泛的应用。石油化工企业生产装置电力设计技术规范规定一级负荷中当生产装置工作电源突然中断时,为确保安全停车,避免引起爆炸、火灾、中毒、人员伤亡、关键设备损坏,或事故一旦发生能及时处理,防止事故扩大,保证关键设备,抢救及撤离工作人员,而必须保证用电的负荷,应视为一级负荷中特别重要负荷,特别重要负荷必须设置UPS电源[2]。一般情况下,化工装置一级负荷都基本配备UPS电源,通过我司多年来对UPS电源应用过程中的经验,探讨化工仪表UPS电源的配置、管理、维护等要点问题,优化UPS配置,不断改善管理及维护能力。

Basic Research on the Burden of Dropping off and Picking up Children: Differences by Employment Type and Gender in the Tokyo Metropolitan Area

There is a need to reduce the burden of child drop-off and pick-up for child-rearing generations, but most studies on the actual situation in Japan are based on survey results. In this study, we analyzed differences in child drop-off and pick-up by employment type and gender, utilizing the “Metropolitan Area Person Trip Survey,” which is a statistical data set. The study targeted households in which both spouses were between 30 and 49 years old, had children under the age of 6, and included the following three groups. 1) Dual-income Group 1 (both spouses employed/on contract/temporary);2) Dual-income Group 2 (husband employed/on contract/temporary, wife part-time);3) Full-time housewife group (husband employed, wife unemployed). The analysis revealed that a) wives are almost always responsible for dropping off and picking up their children;b) husbands drop off and pick up their children less frequently in dual-income households;and c) households with children raising within 10 to 30 km of Tokyo Station have longer commuting times and need to reduce the burden of dropping off and picking up their children.

一种单相在线式UPS的设计

UPS为生产设备持续运行提供稳定电力供应。设计了一个输出为交流30 V的单相不间断电源。电路由市电经过整流电路、升压电路、EG8010和IRS2113S芯片控制驱动的单相桥式逆变电路、辅助电源等组成。当市电发生断电,自动切换至24 V直流稳压电源(模拟蓄电池)供电,以保障设备的正常工作。经测试,本设计输出正弦电压波形失真度小、电压调整率和负载调整率不大于0.5%,同时还具有过流保护、过压保护的功能。

UPS并机直流母线过压故障分析

UPS并机系统作为保障电力供应连续性和稳定性的重要设备,在现代电力系统中发挥着关键作用。但随着电力需求的不断增长和电力网络的复杂化,UPS并机系统面临着各种潜在故障和问题。其中,直流母线过压故障是影响UPS并机系统正常运行的常见故障类型。直流母线过压会对UPS并机系统本身造成损坏,导致接入的电子设备遭受损坏或工作异常,进而影响到整个电力系统的稳定性和可靠性。文章分析了UPS并机直流母线过压故障的发生机理、诊断方法及影响因素,并提出相应的优化策略和措施,以提升UPS并机系统的运行稳定性和可靠性。通过对直流母线过压故障进行系统研究和分析,可以为UPS并机系统的设计、运行及维护提供理论指导,为电力系统的安全稳定运行作出积极贡献。

UPS电控系统在降低海上平台电力关断风险中的应用

阐述钻采平台UPS系统的故障原因,通过对UPS系统馈线柜开关保护方式的优化升级,将欠压脱扣优化为分励脱扣,并对UPS电控系统、镍铬蓄电池备用电源系统优化,从而解决设计缺陷。

地铁专用通信电源UPS构成及典型故障分析

地铁专用通信电源系统是地铁通信系统的一个重要子系统,不间断电源(Uninterruptible Power Supply,UPS)是地铁通信电源系统的重要组成设备。阐述地铁通信电源UPS各个部件构成,包括输入单元、整流器、逆变器、蓄电池组以及静态开关等,介绍各个部件工作原理和地铁通信UPS采用的在线工作方式,并分析单机4种供电工作模式和并机5种供电工作模式的原理。最后,列举实际维护过程中发生的4件UPS故障,通过原因分析及处理过程描述,帮助提高UPS维护的实践能力。

高频模块化UPS并联控制技术研究

针对现有方法控制不间断电源(Uninterrupted Power Supply,UPS)时电源运行稳定性差的问题,开展高频模块化UPS并联控制技术研究。首先建立高频模块化UPS并联运行等效电路,其次设计UPS滑模变结构控制策略,最后将比例-积分-微分(Proportional Integral Derivative,PID)控制与UPS滑模变结构控制相融合,提出一种控制技术。实例应用证明,所提技术可以显著提升电源运行动态性和稳定性,具有较大的应用价值。