检索结果-南通市图书馆

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

低温设备故障工况下的热应力分析

山东化工 2024年第9期53卷 256-258,262页

作者：马建中国原子能科学研究院北京102413

低温精馏系统是通过冷源将原料气进行冷却液化,然后再利用原料气中各组分的沸点差不同,利用精馏的方法将各组分分离开来,以获得所需要的目标组分。本文针对所涉及的低温精馏系统,根据设备安装布置的特殊性,对在生产运行过程中可能因冷... 详细信息

低温精馏系统是通过冷源将原料气进行冷却液化,然后再利用原料气中各组分的沸点差不同,利用精馏的方法将各组分分离开来,以获得所需要的目标组分。本文针对所涉及的低温精馏系统,根据设备安装布置的特殊性,对在生产运行过程中可能因冷源失效或者停机这一现象,对低温精馏塔在结构上产生的热应力进行计算。针对可能出现的冷源故障,进行不同组合模式的模拟计算,获取该工况下最严重位置处的应力水平值,并进行评价,验证该结构的合理性,为可能出现的故障提供技术依据。

关键词：低温精馏热应力耦合冷源

湘南铜山岭铜铅锌矿床闪锌矿矿物化学特征及其成矿指示意义

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

矿物岩石地球化学通报 2024年第2期43卷 387-402页

作者：黄旭栋陆建军高剑峰章荣清 SIZARET Stanislas 马东升王汝成南京师范大学海洋科学与工程学院南京210023 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室南京210023 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550081 Institut des Sciences de la Terre d’Orléans UMR 7327-CNRS/Universitéd’Orléans/BRGMOrléans 45071France

为探讨湘南铜山岭铜铅锌矿床的形成过程,本文对不同类型矿石中的闪锌矿开展了电子探针成分分析。结果表明,Fe主要通过直接置换Zn的方式进入闪锌矿,Cd可能通过与Fe耦合置换Zn的方式(Cd^(2.)+Fe^(2.)←→2.n^(2.))进入闪锌矿,含铜矿石的... 详细信息

为探讨湘南铜山岭铜铅锌矿床的形成过程,本文对不同类型矿石中的闪锌矿开展了电子探针成分分析。结果表明,Fe主要通过直接置换Zn的方式进入闪锌矿,Cd可能通过与Fe耦合置换Zn的方式(Cd^(2.)+Fe^(2.)←→2.n^(2.))进入闪锌矿,含铜矿石的闪锌矿中可能含有亚显微级黄铜矿包裹体。闪锌矿的Fe、Cd含量和Fe/Zn、Zn/Cd值的变化指示近端内矽卡岩、近端外矽卡岩和远端矽卡岩矿体依次形成,铜硫化物-石英脉、铜铅锌硫化物-石英脉和铅锌硫化物-石英脉矿体依次形成,碳酸盐交代型矿体形成较晚。结合矿床地质和闪锌矿矿物学特征,本文认为铜山岭铜铅锌矿床可能存在两期流体出溶,早期出溶温度较高的含Cu、Pb、Zn流体,引起近端内矽卡岩、近端外矽卡岩、远端矽卡岩、铜硫化物-石英脉和铜铅锌硫化物-石英脉矿化;晚期出溶温度较低的含Pb、Zn流体,导致铅锌硫化物-石英脉型和碳酸盐交代型矿化。

关键词：闪锌矿电子探针矿物化学矽卡岩铜铅锌矿床成矿过程铜山岭

Fault Diagnosis of Sensor Network Using Information Fusion Defined on Different Reference Sets

在线全文

学校读者我要写书评

暂无评论

Fault Diagnosis of Sensor Network Using Information Fusion D...

三峡澎溪河水华期间水体CH_4浓度及其通量变化特征初探

2.06 CIE International Conference on Radar

作者： ZHANG Ji 1.WANG Bing-shu 2.ma Yong-guang 2.ZHANG {1.-hua 1.DI jian 1.1.Department of Computer North {2. Electric Power University Baoding {2. 071.03 2.School of Control Science & Engineering North {2. Electric Power University Baoding {2. 071.03

This paper describes a novel scheme for fault diagnosis of sensor network based on different frame of discernment information fusion using evidence *** information of multisensor redundant or complementary in space or time fusion by the RBF neural network is *** RBF neural network is used as modularization overcome the disadvantage of unusable for input parameters changed.A new combination rule under different but compatible frame of discernment is *** the combination operation,the maximum of available knowledge supported by each source of information is exploited and the uncertainty of the effective state between the potential states of a sensor is *** combination guarantees the fault isolability from a practical point of view and is suitable for multiple faults occurring at the same *** tests demonstrate that the diagnosis strategy works effectively in fault diagnosis of sensor network.

关键词： Information fusion Fault diagnosis Sensor Evidential theory

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

环境科学 2018年第4期39卷 1578-1588页

作者：秦宇张渝阳李哲马健荣重庆交通大学水利水运工程教育部重点实验室重庆400074 中国科学院重庆绿色智能技术研究院中国科学院水库水环境重点实验室重庆400714

三峡库区温室气体的排放近年来备受关注.为了揭示三峡库区澎溪河地区水华过程中不同氮磷浓度下藻类生长死亡过程中CH_4吸收释放的规律,于2.1.年4月2.日至2.1.年5月9日,通过添加不同氮磷浓度在澎溪河高阳平湖水域展开野外原位实验.结果表... 详细信息

三峡库区温室气体的排放近年来备受关注.为了揭示三峡库区澎溪河地区水华过程中不同氮磷浓度下藻类生长死亡过程中CH_4吸收释放的规律,于2.1.年4月2.日至2.1.年5月9日,通过添加不同氮磷浓度在澎溪河高阳平湖水域展开野外原位实验.结果表明,在开始实验当日CH_4通量从(1.809 3±0.063 2.μmol·(m^2.h)^(-1.到6 d急剧减少至(0.077 6±0.01. 6)μmol·(m^2.h)^(-1..6 d后变化相对较小,相比较于其他水样只添加磷的水样明显有所回升.在本次实验中藻类的生长与死亡受到了不同N、P浓度梯度的影响.N对藻类的生长影响不大,各种指标与未加N、P营养盐的原水基本一致;在适宜的P浓度下,促进藻类的生长.当P浓度过多时,藻类的生长受到抑制.水样中的CH_4通量的吸收与释放和添加的硝态氮有关.

关键词：三峡水库澎溪河水华氮磷 CH4

Direct measurement of the break-out ^(1.)F(p,γ)^(2.)Ne reaction in the china Jinping underground laboratory(CJPL)

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao Zhang Li‑Yong Zhang jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li jian‑Guo Wang Long Zhang Fu‑Qiang Cao Zhi‑Cheng Zhang Xin‑Zhi jiang Luo‑Huan Wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang ma Er‑Tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China china {1. of {2. energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(1.)F(p,γ)^(2.) Ne reaction with respect to the competing ^(1.)F(p,α)^(1.) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the {1. Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=1.6 keV in the center-of-mass *** key resonance was observed at 2.5.2.keV for the first *** a temperature of approximately 0.1.GK,this new resonance enhanced the thermonuclear ^(1.)F(p,γ)^(2.) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a st{2.er breakdown in their“warm”CNO cycle through the ^(1.)F(p,γ)^(2.) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate china Jinping underground laboratory(CJPL) JUNA

在线全文

学校读者我要写书评

暂无评论

基于java的维基利亚密码分析

陕西师范大学学报（自然科学版） 2008年第S1期36卷 8-10页

作者：弋建伟马晓荣陕西职业技术学院实训中心陕西职业技术学院计算机科学系陕西西安710100

维基利亚密码是经典的加密方法。借助英文中字母的统计频率,使用Kassiki测试法和重合指数法给出了分析维基利亚密码的方法,给出了这种分析方法的JavaApplet实例。

关键词：维基利亚密码 Kassiki测试法重合指数

CYCIAE-30回旋加速器主磁铁液压举升系统

在线全文

学校读者我要写书评

暂无评论

同位素 2002年第2期15卷 86-89页

作者：赵振鲁邢建升储诚节陈荣范中国原子能科学研究院同位素研究所北京102413 中国原子能科学研究院核技术与计算机应用研究所北京102413

研究设计了CYCIAE-30回旋加速器主磁铁液压举升系统的油路结构和控制系统,并说明了它的工作原理。6年来的实际使用情况证明,该系统各项功能指标均达到了设计时的要求;油缸的实际最大工作行程为850mm,8个齐缝定位销回位重复定位精度为±0... 详细信息

研究设计了CYCIAE-30回旋加速器主磁铁液压举升系统的油路结构和控制系统,并说明了它的工作原理。6年来的实际使用情况证明,该系统各项功能指标均达到了设计时的要求;油缸的实际最大工作行程为850mm,8个齐缝定位销回位重复定位精度为±0.01.m,两油缸同步精度可控制在5～1.mm。该系统运行安全可靠,操作简便灵活。

关键词： CYCIAE-30 主磁铁回旋加速器位置同步重复定位控制系统油路结构

Three-dimensional interconnected graphene network-based high-performance air electrode for rechargeable zinc‒air batteries

在线全文

学校读者我要写书评

暂无评论

Susmat 2024年第3期4卷 192-203页

作者： Jia-Xing An Yu Meng Hong-Bo Zhang Yuanzhi Zhu Xiaohua Yu Ju rong Peng-Xiang Hou Chang Liu Hui-Ming Cheng Jin-Cheng Li Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus MaterialsKunming University of Science and TechnologyKunmingChina Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangChina Faculty of materials Science and Engineering Kunming University of Science and TechnologyKunmingChina

Although zinc-air batteries(ZABs)are regarded as one of the most prospective energy storage devices,their practical application has been restricted by poor air electrode ***,we developed a free-standing air electrode that is fabricated on the basis of a multifunctional three-dimensional interconnected graphene ***,a three-dimensional interconnected graphene network with fast {1.ss and electron transport ability,prepared by catalyzing growth of graphene foam on nickel foam and then filling reduced graphene oxide into the pores of graphene foam,is used to anchor iron phthalocyanine molecules with {2. Fe-N_(4)sites for boosting the oxygen reduction during discharging and nanosized FeNi hydroxides for accelerating the oxygen evolution during *** a result,the obtained air electrode exhibited an ultra-s{1.ll electrocatalytic overpotential of 0.603 V for oxygen reactions,a high peak power density of 2.0.2.Wcm^(-2.,and a s{1.ll and stable charge-discharge voltage gap of 0.70 V at 1.{1. cm^(-2.after 1.36 ***,in situ Ra{1.n spectroscopy together with theoretical calculations confirmed that phase transfor{1.tion of FeNi hydroxides takes place fromα-Ni(OH)_(x)toβ-Ni(OH)_(x)toγ-Ni^((3+δ)+)OOH for the oxygen evolution reaction and Ni is the active center while Fe enhances the activity of Ni active sites.

关键词： in situ Raman interconnected graphene network iron phthalocyanine NiFe hydroxide zinc‒air battery

Effect of Jiuwei Zhuhuang Powder on Cough Resolution in Children with Upper Respiratory Tract Infections:A Multicenter Randomized Controlled Trial

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2022年第5期28卷 387-393页

作者： LUO Hui SONG Gui-Hua ma Xiao-{1. SUN Meng-meng ZHANG man XIE {1.-{2. PENG Shao institute for Tibetan Medicine China Tibetology Research CenterBeijing(100101)China Department of Pediatrics the First Affiliated Hospital of Henan University of Chinese MedicineZhengzhou(450000)China Department of Pediatrics Huaihe Hospital of Henan UniversityZhengzhou(450000)China Department of Pediatrics the First Affiliated Hospital of Zhengzhou UniversityZhengzhou(475000)China School of Statistics Renmin University of ChinaBeijing(100872)China

Objective:To assess the effectiveness of Jiuwei Zhuhuang Powder(JWZH),a Tibetan patent medicine in treating upper respiratory tract infection(URTI)associated cough in ***:The study was a multicenter,randomized,open-label,controlled trial.A total of 1.2.children aged 2.to 1. years old,with URTIassociated cough within 48 h of onset,were randomly assigned to two groups at a 1.1.ratio by computer-generated randomization *** were treated with JWZH(1.to 1.5 g,twice to thrice daily)in the treatment group or conventional treatment(Pediatric Paracetamol,Artificial Cow-bezoar and Chlorphenamine maleate Granules,0.2. to 1.g,thrice daily)in the control group for 5 *** primary endpoints were the time to cough resolution and 4-day cough resolution *** secondary endpoints were the daily improvement in symptom scores and cough resolution rate during the study ***:A total of 1.8 children were included in the intention-to-treat analysis,with 71.cases in the treatment group and 67 cases in the control *** with the conventional treatment,the children receiving JWZH had a shorter time to cough resolution[hazard ratio,2.1.;95%confidence interval(CI),1.2.-3.40;P=0.003].The median time to cough resolution for children receiving JWZH was shorter than that of the conventional treatment(2.days vs.3 days;P1..The 4-day cough resolution rate in the JWZH group was higher than that of the control group(94.4%vs.74.6%;risk difference:1..8%,95%CI:8.1.-31.5%;relative risk:1.2.5,95%CI:1.088-1.470;P=0.001..There were no statistically significant differences in the improvement of other symptoms caused by URTI(P>0.05).Adverse events was reported in 5.6%(4/71.and 4.5%(3/67)in participants of JWZH and PPACCM groups(P>0.05),respectively,which were all mild and resolved without ***:JWZH seemed to be a safe and effective therapy for URTI-associated cough in children.(Trial registration *** CTR2.0003942.0}

关键词： child cough upper respiratory tract infection Jiuwei Zhuhuang Powder randomized controlled trial Tibetan medicine