检索结果-南通市图书馆

A Comprehensive Electromagnetic Model of Electrical Slag Surfacing With Liquid Metal Process for Preparing Compound Rolls

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第S2期19卷 921-924页

作者： LI Wan-ming GENG Xin LI Hua-bing Yi Gao-song FENG Hao JIANG Zhou-hua School of Materials and Metallurgy Northeastern University

The process of Electrical slag surfacing with liquid metal(ESS LM)is a complex physical and chemical process including electric field,magnetic field,flow field and temperature field,*** the complicated technology and high cost of manufacturing compound rolls,simulating the relationship between ESS LM process parameters and physical fields of ESS LM process is *** the numerical simulation of finite volume method to the process of ESS LM in the conditions of different roll core diameters,slag amount,pouring speed,pouring temperature and input power,temperature field and flow field in different conditions were *** the diameter of core material, operation voltage,pouring rate,pouring temperature and slag height of conductive mold was 250mm,40V,8mm/min, 1750K and 50mm respectively,the depth of molten metal was 30mm and fusion thickness of core material was 5mm which was consistent with the experiment *** to the simulation results,operation with voltage of 42V, cladding speed of 10mm/min,pouring temperature of 1760K and slag height of 54mm in the conductive mould,achieved much more shallow metal pool,which is beneficial to vertical crystallization.

关键词： ESS LM electromagnetic force heat Production compound Roll

Analysis of risk factors of nonischemic ST-segment elevation in patients with electrocardiographic left ventricular high voltage

在线全文

学校读者我要写书评

暂无评论

South China Journal of Cardiology 2021年第2期22卷 117-126页

作者： GUO Hai-sen CHEN song-ming ZHANG Jia-wei NI Chu-min CAI zhi-xiong ZHANG Wei-dai Department of Cardiology Shantou Central HospitalShantou 515000GuangdongChina Department of Cardiology the First Affiliated Hospital of Shantou University Medical CollegeShantou 515000GuangdongChina.

Background ST-segment elevation(STE)was an important but neglected sign in patients with electrocardiographic left ventricular high voltage(LVHV),which might lead to a mistaken diagnosis of ST-segment elevation myocardial infarction(STEMI).The aim of this study was to investigate risk factors associated with STE in patients with *** A total of 1,590 inpatients(including 81 cases with ST-segment elevation and1509 cases with non-ST segment elevation)with electrocardiographic LVHV without confounding factors(such as myocardial infarction)were enrolled in this *** 81 ST-segment elevation(STE)cases were assigned to the STE group while 87 out of the 1509 non-ST segment elevation(non-STE)cases were randomly selected and assigned to the non-STE *** on potential risk factors and patients’characteristics were *** regression analysis and receiver operating characteristic curve(ROC)were used to identify the risk of STE in patients with *** The mean age of the 168 studied cohort(119 males,70.83%)was 62.33±16.27 *** two groups did not differ with regard to gender(male)and age(P=0.420 and P=0.795,respectively).Multivariate analysis showed that stroke,infection,and the value of SV1+RV5 were significantly associated with STE secondary to *** area under the curve(AUC)showed that the optimal value of SV1+RV5 cut-off for predicting STE in patients with LVHV was 4.805(sensitivity:40.74%,specificity:80.46%,AUC:0.634,95%CI:0.550-0.719,P<0.05).Conclusions A value of SV1+RV5 more than 4.8 m V,stroke,and infection are independent risk factors associated with non-ischemic STE in patients with electrocardiographic LVHV.

关键词： chest pain diagnosis echocardiography left ventricular hypertrophy left ventricular high voltage ST-segment elevation

基于GC/MS的储藏粳稻谷挥发物质变化研究

在线全文

学校读者我要写书评

暂无评论

中国粮油学报 2013年第11期28卷 97-102页

作者：宋伟张明张婷筠粮食储运国家工程实验室南京财经大学食品科学与工程学院南京210046

应用顶空固相微萃取-气质联用分析技术,对不同储藏条件下稻谷样品的挥发物质进行测定,用主成分分析法(PCA)研究不同稻谷样品间挥发物质的差异,进而找出能够反应稻谷储藏品质的特征性挥发物。测定结果表明,共检测到不同储藏条件下的稻谷... 详细信息

应用顶空固相微萃取-气质联用分析技术,对不同储藏条件下稻谷样品的挥发物质进行测定,用主成分分析法(PCA)研究不同稻谷样品间挥发物质的差异,进而找出能够反应稻谷储藏品质的特征性挥发物。测定结果表明,共检测到不同储藏条件下的稻谷样品挥发物质117种,从中筛选出贡献较大的83种成分进行分析,其中烃类29种,醛类17种,酮类10种,醇类8种,酸酯类10种,杂环类9种。主成分分析(PCA)结果表明,储藏期间稻谷的酸酯类、醇类、醛类、酮类、烷烃类、烯烃类挥发物质下降明显,且温度越高下降程度越大;苯类挥发物质随储藏时间的延长有上升趋势,温度越高上升的越明显;杂环类挥发物质受储藏时间以及温度的影响较小。各类挥发物质受储藏条件影响大小顺序为酸酯类>醇类>酮类>醛类>烃类>杂环类,同时得到评判稻谷品质的特征性挥发物质。

关键词：稻谷样品储藏条件挥发性物质主成分分析

Comparison of gene expression profiles between primary tumor and metastatic lesions in gastric cancer patients using laser microdissection and cDNA microarray

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第43期12卷 6949-6954页

作者： Long Wang Jin-Shui Zhu ming-Quan song Guo-Qiang Chen Jin-Lian Chen Department of Gastroenterology Sixth People's Hospital Affiliatedto Shanghai Jiaotong University Shanghai 200233 China Shanghai Experimental Animal Centre Chinese Academy of Sciences Shanghai 200233 China

AIM. To study the differential gene expression profiles of target cells in primary gastric cancer and its metastatic lymph nodes using laser microdissection （LMD） in combination with cDNA microarray. METHODS： Normal gastric tissue samples from 30 healthy individuals, 36 cancer tissue samples from primary gastric carcinoma and lymph node metastasis tissue samples from 58 patients during gastric cancer resection were obtained using LMD in combination with cDNA microarray independently. After P27-based amplification, aRNA from 36 of 58 patients （group 1） with lymph node metastasis and metastatic tissue specimens from the remaining 22 patients （group 2） were applied to cDNA microarray. Semiquantitative reverse transcriptase polymerase chain reaction （RT-PCR） and imrnunohistochemical assay verified the results of microarray in group 2 and further identified genes differentially expressed in the progression of gastric cancer. RESULTS： The expression of 10 genes was up-regulated while the expression of 15 genes was down-regulated in 22 gastric carcinoma samples compared with that of genes in the normal controls. The results were confirmed at the level of mRNA and protein, and suggested that four genes （OPCML, RNASE1, YES1 and ACK1） could play a key role in the tumorigenesis and metastasis of gastric cancer. The expression pattern of 3 genes （OPCML, RNASE1 and YES1） was similar to tumor suppressor genes. For example, the expression level of these genes was the highest in normal gastric epithelium, which was decreased in primary carcinoma, and further decreased in metastatic lymph nodes. On the contrary, the expression pattern of gene ACK1 was similar to that of oncogene. Four genes were further identified as differentially expressed genes in the majority of the cases in the progression of gastric cancer. CONCLUSION： LMD in combination with cDNA microaro ray provides a unique support foe the identification of early expression profiles of differential genes and the expr

关键词： Gastric cancer cDNA microarray Laser microdissection Reverse transcriptase polymerase chain reaction P27

Studies on the Total Synthesis of Hainanolide (VI)-The First Access to the Lactone Functionality

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 Chemical Letters 2000年第4期11卷 295-296页

作者： Xiao ming YU Shi zhi CHEN Liang HUANG (Institute of Materia Medica. Chinese Academy of Medical Sciences & Peking Union Medical College. No. 1 Xian Nong Tan Street. Beijing 100050) Chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China Peking Union Med Coll Beijing 100050 Peoples R China

C-2a- beta-H ketone 6 was synthesized from the exo-IMDA-additive 4 with the aid of singlet oxygen, and ring E of hainanolide was assembled via kinetic enol ether of 6.

关键词： hainanolide exo-IMDA-additive 1,4-lactone

在线全文

学校读者我要写书评

暂无评论

一种新的小波域视频可分级运动估计方案

计算机学报 2006年第12期29卷 2112-2118页

作者：宋传鸣王相海辽宁师范大学计算机与信息技术学院

首先提出了一种运动估计方法MLBS（Modified Low Band Shift），并在此基础上提出了基于MLBS的小波域视频可分级运动估计方案MLBSSME．利用MLBS方法，提高了运动估计的准确度．借助重叠块运动补偿方法，有效降低了最高分辨率下解码图像... 详细信息

首先提出了一种运动估计方法MLBS（Modified Low Band Shift），并在此基础上提出了基于MLBS的小波域视频可分级运动估计方案MLBSSME．利用MLBS方法，提高了运动估计的准确度．借助重叠块运动补偿方法，有效降低了最高分辨率下解码图像的块效应．根据小波变换的多分辨率特性，利用缩小了的搜索窗口提高了搜索速度．这种方法可有效应用于空间可分级和数率可分级的视频编码器中．实验结果证明，对于多种类型的标准测试视频流，MLBSSME算法始终能保持很高的估计精度．利用该算法补偿得到的预测帧，其PSNR较之基于下层LL子带的分层运动估计方法和子带直接运动估计方法平均要高出1～3dB，而对于空间细节较简单的视频，其PSNR比LBS方法提高了0．5～1dB，并且算法的时空复杂度是LBS方法复杂度的30％～40％．

关键词：运动估计可分级编码视频编码小波域

表层厚度渐变一维耦合腔光子晶体的反射相位特性及其应用

在线全文

学校读者我要写书评

暂无评论

物理学报 2016年第7期65卷 133-140页

作者：戚志明梁文耀广东开放大学广东理工职业学院广州510091 华南理工大学物理与光电学院广州510640

利用传输矩阵法研究了表层厚度渐变的一维非对称耦合腔光子晶体的反射相位特性.研究表明,光子禁带内(包括缺陷模附近)的反射率在98%以上,且基本不受表层厚度影响,特别是,在非正入射情况下,简并的缺陷模随着表层厚度的变化会发生分裂;进... 详细信息

利用传输矩阵法研究了表层厚度渐变的一维非对称耦合腔光子晶体的反射相位特性.研究表明,光子禁带内(包括缺陷模附近)的反射率在98%以上,且基本不受表层厚度影响,特别是,在非正入射情况下,简并的缺陷模随着表层厚度的变化会发生分裂;进一步研究发现,在缺陷模分裂处附近,TE,TM偏振的反射相位以及它们之间的相位差均敏感地依赖于表层厚度的变化,从而使得反射光的偏振态也随表层厚度的变化而敏感变化,其物理机理在于缺陷模分裂所造成的剧烈相位变化.基于上述特性,设计了一种表层厚度呈二维周期变化的一维光子晶体结构,从该结构反射的激光经透镜聚焦后,在聚焦区域同时存在各种偏振态(包括沿不同方向的线偏振、左旋或右旋圆偏振、椭圆偏振等)的子光束,它们叠加后在聚焦区域将产生具有无规相位和无规偏振态的光场.以上结果能有效降低激光的相干性,在激光核聚变等领域有潜在的应用价值.

关键词：光子晶体传输矩阵法相位偏振

在线全文

学校读者我要写书评

暂无评论

基于SCL模型的配置工具的设计与实现

电力系统保护与控制 2009年第12期37卷 82-85页

作者：林知明蒋士林华东交通大学电气与电子工程学院江西南昌330013

分析了基于变电站配置语言SCL的变电站及智能电子设备配置方法及技术,在详细讨论两类配置工具概念的基础上,设计了基于SCL模型的配置工具的功能模块和实现方法。论文从软件工程的角度,对配置工具的配置管理过程进行了详细分析,提出了配... 详细信息

分析了基于变电站配置语言SCL的变电站及智能电子设备配置方法及技术,在详细讨论两类配置工具概念的基础上,设计了基于SCL模型的配置工具的功能模块和实现方法。论文从软件工程的角度,对配置工具的配置管理过程进行了详细分析,提出了配置工具的开发框架和软件模块的组织方式,阐述了5大模块的实现技术。以SCL解析器和SCL生成API两模块为例,具体分析了面向对象软件开发技术、Eclipse开发平台、JDOM开发工具使用方法及模块实现流程等实现细节。经实验室模拟应用,结果表明符合IEC61850标准的访问存取方法的要求。

关键词：变电站自动化系统 IEC 61850 SCL IED 配置工具

Screening of Epstein-Barr Virus Early Antigen Expression Inducers from Chinese Medicinal Herbs and Plants

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1994年第1期7卷 50-55页

作者： ZENG YI ZHONG JI AN-ming YE SHU-QING NI zhi-Yu MIAO XUL-QIAN MO YONU-KUN AND LI ZE-LIN(Institute of Virology, Chinese Academy ’ of ’Preventive Medicine, Beijing,)(Nasopharyngeal Control and Treatmenl Institute of Cangwu, Guangxi,Guangxi Herbs Bitany Institute of Virology Chinese Academy of Preventive Medicine Beijing.

Ether extrilcls of 1693 Chinesc medicinal herbs and plilnts from 268 families werestudied for the induction of Epstcin-Barr viral (EBV ) early antigcn (EA ) expression in theRaji cell line. Fifty-two from 18 families were found to have inducing activity. Twenty-fiveand seven of them were from Euphorbiaccae and Thymclaeaceae, respectively. Some ofthem, such as Croton tiglium, Euphorbia kansui, Daphnc genkwa, Wikstrocmia chamacdaphen, Wikstroemia indica, Prunus mandshurica Koehne and Achyranthes bidentata arecommonly used drugs. The significance of these herbs in the activation of EBV in vivo andtheir relation to the development of nasopharyngeal carcinoma were discussed.

关键词： In Screening of Epstein-Barr Virus Early Antigen Expression Inducers from Chinese Medicinal Herbs and Plants Raji