检索结果-南通市图书馆

Study of Emission Character of High Current Densities Thermionic Cathodes for Electron Beam Processing System

在线全文

学校读者我要写书评

暂无评论

近代物理研究所和兰州重离子加速器实验室年报：英文版 2008年第1期 158-159页

作者： Cao Shuchun Li Zhongping zhang ziming Wang Bin Xiao Rongqing Su Yalong Wan Ming

Trends in Incidence of HIV and Syphilis Among Men Who Have Sex with Men—Tianjin Municipality,China,2013-2022

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

China CDC weekly 2024年第27期6卷 651-657页

作者： Yan Guo Fangfang Chen Hui Gong ziming Wu Xinying zhang Tielin Ning Zhongquan Liu Jianyun Bai Long Li Jie Yang Fangning Zhao Jinyu Hou Maohe Yu Houlin Tang STD&AIDS Control and Prevention Section Tianjin Center for Disease Control and PreventionTianjinChina National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Center for AIDS/STD Control and PreventionChinese Center for Disease Control and PreventionBeijingChina STD&AIDS Control and Prevention department Tianjin Hongqiao District Center for Disease Control and PreventionTianjinChina Tianjin Shenlan Public Health Counseling Service Center TianjinChina Tianjin Key Laboratory of Pathogenic Microbiology of Infectious Disease Tianjin Centers for Disease Control and PreventionTianjinChina

Summary What is already known about this topic?Given the common modes of transmission,outbreaks of both human immunodeficiency virus(HIV)and syphilis are primarily observed in men who have sex with men(MSM).However,minimal research has been conducted to concurrently evaluate the rates and trends of HIV and syphilis incidence within this community in *** is added by this report?

关键词： Incidence primarily immunodeficiency

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

声子晶体导线的振动带隙特性

河海大学学报（自然科学版） 2017年第3期45卷 224-229页

作者：张子明柯一丹韩林张研河海大学力学与材料学院江苏南京210098

为了解决超、特高压输电线路的舞动问题,提出了一种由导线、间隔棒、弹簧振子组成的声子晶体导线。基于导线的振动微分方程与Bloch理论,建立了计算声子晶体导线振动能带结构的传递矩阵法,进而通过计算发现声子晶体导线在舞动常发的频率... 详细信息

为了解决超、特高压输电线路的舞动问题,提出了一种由导线、间隔棒、弹簧振子组成的声子晶体导线。基于导线的振动微分方程与Bloch理论,建立了计算声子晶体导线振动能带结构的传递矩阵法,进而通过计算发现声子晶体导线在舞动常发的频率范围内具有局域共振型带隙特性。为了验证该带隙特性,以四分裂导线为例,应用有限元法计算了有限周期声子晶体导线的振幅和频率响应特性。结果表明,在带隙的频率范围内导线振动响应具有明显衰减,为输电线路减振防舞提供一种新思路。

关键词：导线舞动声子晶体弹簧振子带隙数值计算

在线全文

学校读者我要写书评

暂无评论

基于废油和废丝再生的锦纶6生产工艺与性能

丝绸 2023年第7期60卷 33-40页

作者：张子明林志鹏刘旻福建永荣锦江股份有限公司福州350212 福州大学化学学院福州350108

通过回收锦纶6废丝进行破碎再造粒,得到相对黏度2.53±0.08的再生切片。回收锦纶6纺丝废油,通过提纯再生,并加入异噻唑啉酮溴硝丙二醇乙二醇动态配比除菌剂。同时以聚氧乙烯月桂酸酯和N-十二烷基乙醇胺作为表面活性剂,制造出质量分数85%... 详细信息

通过回收锦纶6废丝进行破碎再造粒,得到相对黏度2.53±0.08的再生切片。回收锦纶6纺丝废油,通过提纯再生,并加入异噻唑啉酮溴硝丙二醇乙二醇动态配比除菌剂。同时以聚氧乙烯月桂酸酯和N-十二烷基乙醇胺作为表面活性剂,制造出质量分数85%~90%的再生油剂。进而将再生切片搭配再生油剂用于纺丝生产,以93.5 dtex/68F POY纤维为例,研究发现相对黏度2.53的再生切片搭配使用90%质量分数的再生油剂,同时加装过滤精度为20μm的熔体过滤器进行纤维生产的生产状况和性能最佳:组件周期可达12 d、千锭断头35次、纤维断裂强度为3.95 cN/dtex、断裂伸长率为67.55%、条干不匀率为0.97%、纤维含油率为0.58%。由再生93.5 dtex/68F POY纤维加弹生产的再生77 dtex/68F DTY纤维,各项物化指标均吻合原生切片搭配原生油剂生产的DTY纤维。

关键词：民用长丝纤维锦纶6 再生纤维再生切片再生油过滤器

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

知识发现视角下的文献量化:荟萃分析框架

情报杂志 2019年第9期38卷 150-157页

作者：张孜铭刘向曾培春华中师范大学信息管理学院武汉430079 华中师范大学经济与工商管理学院武汉430079

[目的/意义]针对科研人员对于定量文献综述的需求,解决传统荟萃分析缺乏对具体情境的适应性问题,为历史文献的知识发现提供一种实践性强的应用框架。[方法/过程]通过将荟萃分析与系统量化文献综述方法有机结合,并辅之以数据挖掘相关方法... 详细信息

[目的/意义]针对科研人员对于定量文献综述的需求,解决传统荟萃分析缺乏对具体情境的适应性问题,为历史文献的知识发现提供一种实践性强的应用框架。[方法/过程]通过将荟萃分析与系统量化文献综述方法有机结合,并辅之以数据挖掘相关方法,建立了一种历史文献的量化-荟萃分析框架,并以计划行为理论模型相关文献为实例进行研究。[结果/结论]结果发现该框架在定量文献综述方面有诸多优势和广泛的应用场景,可以从不同角度实现知识挖掘与知识发现。

关键词：荟萃分析知识发现 SQLR 数据挖掘 TF-IDF

Progress of Jinping Underground laboratory for Nuclear Astrophysics(JUNA)

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第4期59卷 1-7页

作者： WeiPing Liu ZhiHong Li JiangJun He XiaoDong Tang Gang Lian Zhu An JianJun Chang Han Chen QingHao Chen XiongJun Chen ZhiJun Chen BaoQun Cui XianChao Du ChangBo Fu Lin Gan Bing Guo GuoZhu He Alexander Heger SuQing Hou HanXiong Huang Ning Huang BaoLu Jia LiYang Jiang Shigeru Kubono JianMin Li KuoAng Li Tao Li YunJu Li Maria Lugaro XiaoBing Luo HongYi Ma ShaoBo Ma DongMing Mei YongZhong Qian JiuChang Qin Jie Ren YangPing Shen Jun Su LiangTing Sun WanPeng Tan Isao Tanihata Shuo Wang Peng Wang YouBao Wang Qi Wu ShiWei Xu ShengQuan Yan LiTao Yang Yao Yang XiangQing Yu Qian Yue Sheng Zeng HuanYu zhang Hui zhang LiYong zhang NingTao zhang QiWei zhang Tao zhang XiaoPeng zhang XueZhen zhang ziming zhang Wei Zhao Zuo Zhao Chao Zhou Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China Institute of Modern Physics Lanzhou 730000 China College of Nuclear Science and Engineering Sichuan University Chengdu 610065 China Department of Engineering Physics Tsinghua University Beijing 100084 China Department of Physics and Astronomy Shanghai Jiaotong University Shanghai 200240 China School of Physics and Astronomy Monash University Melbourne Victoria 3800 Australia Center for Nuclear Study University of Tokyo Wako Saitama 351-0198 Japan Konkoly Observatory of the Hungarian Academy of Sciences 1121 Budapest Konkoly-Thege Miklos u. 13-17 Hungary Department of Physics University of South Dakota Vermillion SD 57069 United States School of Physics and Astronomy University of Minnesota Minneapolis MN 55455 United States Department of Physics University of Notre Dame Notre Dame IN 46556 Unites States Research Center for Nuclear Physics Osaka University Suita Osaka 565-0871 Japan School of Space Science and Physics Shandong University Weihai Campus Weihai 264209 China

Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to directly study for the first time a number of crucial reactions occurring at their relevant stellar energies during the evolution of hydrostatic stars. In its first phase, JUNA aims at the direct measurements of^(25)Mg(p,γ)^(26)Al,^(19)F(p,α)^(16)O,^(13)C(α,n)^(16)O and ^(12)C(α,γ)^(16)O reactions. The experimental setup,which includes an accelerator system with high stability and high intensity, a detector system, and a shielding material with low background, will be established during the above research. The current progress of JUNA will be given.

关键词： direct measurement underground laboratory (25)Mg(p γ)(26)Al (19)F(p α)(16)O (13)C(α n)(16)O and (12)C(α γ)(16)O reactions Gamow window JUNA

HiFAST:An HI Data Calibration and Imaging Pipeline for FAST.Ⅱ.Flux Density Calibration

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第8期24卷 100-112页

作者： ziming Liu Jie Wang Yingjie Jing Zhi-Yu zhang Chen Xu Tiantian Liang Qingze Chen Ningyu Tang Qingliang Yang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 210023China Department of Physics Anhui Normal UniversityWuhu 241002China

Accurate flux density calibration is essential for precise analysis and interpretation of observations across different observation modes and *** this research,we first introduce the flux calibration model that incorporated in Hi FAST pipeline,and designed for processing HⅠ21 cm ***,we investigate different calibration techniques and assess the dependence of the gain parameter on the time and environmental factors.A comparison is carried out in various observation modes(e.g.,tracking and scanning modes)to determine the flux density gain(G),revealing insignificant discrepancies in G among different ***-term monitoring data shows a linear correlation between G and atmospheric *** subtracting the G-Temperature dependence,the dispersion of G is reduced to~5%)when utilizing a constant G for calibration *** study will serve as a useful addition to the results provided by Jiang et *** measurement of G for the 19 beams of FAST,covering the frequency range 1000-1500 MHz,can be found on the Hi FAST homepage:https://***/fluxgain.

关键词： telescopes-techniques image processing-methods observational-radio continuum galaxies-cosmology observations

Correlation between intima-media inhomogeneity and carotid artery elasticity in patients with type 2 diabetes mellitus

在线全文

学校读者我要写书评

暂无评论

Correlation between intima-media inhomogeneity and carotid a...

An ESS System for ECRIS Emittance Research

中华医学会第十三次全国超声医学学术会议

作者： Yu Wu Yaoxin Cheng Manying Xie ziming zhang Manwei Liu Mingxing Xie Qing lv Department of Ultrasonography Union Hospital of Tongji Medical CollegeHuazhong University of Science and Technology

Objective The aim of our study is to explore the correlation between intima-media inhomogeneity(IMI) and carotid artery elasticity in patients with type 2 diabetes mellitus(T2 DM).Methods 39 Patients withT2 DM and 31 normal control subjects were *** and IMTmean of carotid artery were measured by an automatic measuring *** indexes(βmean,Eρ,AC,PWVβmean) of carotid artery were measured by *** relationship between the IMI and elastic index and cardiovascular risk factors were analyzed.

关键词：

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

IMP & HIRFL Annual Report 2004年 192-193页

作者： Cao Yun, Sun Liangting, Ma Baohua, zhang ziming, Wang Hui, He Wei, Li Xixia Feng Yucheng, Li Jingyu, Guo Xiaohong, zhang Xuezhen and Zhao Huanyu

There are many characteristics to describe the performance of an ion source, such as beam current, emittance, energy spread of the extracted beam and so on. Among them, the beam emittance is always the one that make us suspicious. So it is especially important to measure and study the emittance of ion beams. Now, there are two kinds of methods to measure ion beam emittance. One is destructive method. With this method, the

关键词：