检索结果-南通市图书馆

Progress in research on diffusional phase transformations of Fe–C alloys under high magnetic fields

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第5期29卷 707-718页

作者： Kai Wang Chao-jie Yan chen-hua yuan Xi-chen Yang Li-jia Zhao Qiang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina School of Materials Science and Engineering Northeastern UniversityShenyang110819LiaoningChina

The solid-phase transformations of metal materials under high magnetic fields are an important topic in research on the electromagnetic processing of *** in research on the diffusional phase transformations of Fe–C alloys under high magnetic fields is *** effects of high magnetic fields on the microstructural evolution in diffusional phase transformations in Fe–C alloys are *** kinetics of ferrite transformations,pearlite transformations,and the precipitation of carbides under high magnetic fields are reviewed in terms of the thermodynamics of phase transformations and the diffusion behavior of carbon ***,future trends in research on diffusional phase transformations of Fe–C alloys under high magnetic fields are discussed.

关键词： High magnetic field Diffusional phase transformation Fe–C alloy Microstructure Thermodynamics Kinetics

A novel short transcript isoform of chicken IRF7 negatively regulates interferon-βproduction

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

Journal of Integrative Agriculture 2023年第7期22卷 2213-2220页

作者： MA Yu-chen chen hua-yuan GAO Shen-yan ZHANG Xiao-zhan LI Yong-tao YANG Xia ZHAO Jun WANG Zeng College of Veterinary Medicine Henan Agricultural UniversityZhengzhou 450046P.R.China College of Veterinary Medicine Henan University of Animal Husbandry and EconomyZhengzhou 450046P.R.China

Type I interferon(IFN-I)provides an important first line to protect avian species against pathogens *** regulatory factor 7(IRF7)has been identified as the most important regulator for both DNA and RNA virus-induced IFN-I production in *** four splicing variants of IRF7 have been identified in mammals,it is still unclear whether alternative splicing patterns and the function of IRF7 isoform(s)exist in *** this study,we reported a novel short transcript isoform of chicken IRF7(chIRF7),termed chIRF7-iso,which contained an intact N-terminal DNA-binding domain(DBD)and 14 amino acids different from chIRF7 in the *** of chIRF7 in chicken leghorn male hepatocellular(LMH)cells activated the IFN-βpromoter and significantly inhibited Newcastle disease virus(NDV)and fowl adenovirus serotype 4(FAdV-4)***,overexpression of chIRF7-iso blocked the IFN-βpromoter activity and was favorable for NDV and FAdV-4 replication in ***,our results confirm that a novel chIRF7 isoform-mediated negative regulates IFN-βproduction,which will contribute to understanding the role of chIRF7 in innate antiviral response in chicken.

关键词： chIRF7 chIRF7 isoform negative regulation IFN-β

Thermal behaviors of deactivation catalysts for synthesizing 2, 3, 5-trimethylhydroquinone

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2005年第z1期12卷 65-67页

作者： QIAN Dong SHI Ai-hua chen Qi-yuan LIU Zhi-jian School of Chemistry and Chemical Engineering Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Sinopec Changling Catalyst Division Yueyang 414012 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

The thermal behaviors of the deposits on supported noble metal catalysts for synthesizing 2, 3, 5-trimethylhydroquinone by DSC were studied. The results show that the supported Pd catalysts have two exothermic peaks at around 312 ℃ and 435 ℃ in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 ℃. Therefore, it is supposed that the adsorptive states of deposits on supported Pt catalysts and supported Pd catalysts are different, which may be one reason leading to the stability difference between supported Pt catalysts and supported Pd catalysts.

关键词： deposit supported Pd catalysts supported Pt catalysts DSC

DRY/WET CLIMATE CHANGE SINCE 960 *** TAIHU DRAINAGE BASIN OF CHINA

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 Geographical Science 2001年第4期11卷 57-63页

作者： WANG Zhang-hua, chen Zhong-yuan, KOU Ying, chen Yu (Department of Geography, East China Normal University, Shanghai 200062, P. R. China) Department of Geography East China Normal University Shanghai P. R. China

ABSTRACT: The present study reconstructs an annual dry/wet grade series from 960 A. D. to 1992 A. D. in the Tai-hu drainage basin of eastern coast, China by collecting historical climatic records, to examine the climate periodicity and climate jumps. Power Spectrum analysis reveals that the dry/wet climate in the study area was a superposed phenomenon with the major period of quasi-100-year, and several other notable periods. These periods were supposed to be closely linked with the celestial activity. Climate jumps are detected using moving t-test. The two abrupt changes around 1247 - 1263 A. D. and 1618 - 1635 A. D. are proved as regional events. The 14th to 15th century appeared as the wettest period during the last 1000 years in the Taihu drainage basin. These are interpreted as the consequence of east Asia climate change.

关键词： climate periodicity climate jump annual dry/wet grade series Taihu drainage basin

Effects of intra-gastric beta-casomorphin-7 on somatostatin and gastrin gene expression in rat gastric mucosa

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第14期13卷 2094-2099页

作者： Ya-Feng Zong Wei-hua chen yuan-Shu Zhang Si-Xiang Zou Department of Animal Physiology and Biochemistry Nanjing Agricultural University Nanjing 210095 Jiangshu Province China

AIM： To investigate the in vivo effect of beta-casomorphin-7on the regulation of gastric somatostatin and gastrin messenger RNA in rat gastric mucosa.METHODS： Somatostatin and gastrin mRNA were quantified by RT-PCR and in situ hybridization （ISH）in 24 rats. The rats were divided into three treatment groups： basal diet ＋ physiological saline （n = 8）, basal diet ＋ beta-casomorphin-7 （7.5 × 10^-7 mol）（n = 8）,and basal diet ＋ poly-Gly-7 （containing equal mol of N with 7.5 × 10^-7 mol beta-casomorphin-7）（n = 8）.After oral administration for 30 days, rats were killed by exsanguinations.RESULTS： After intra-gastric administration of betacasomorphin-7 for 30 d, gastrin mRNA increased by 52.8% （P 〈 0.05, n = 8）, and somatostatin mRNA levels decreased by 30.7% compared with the controls （P 〈0.01, n = 8）. No significant differences in the expression of the two genes were observed in the poly-Gly-treated group, although gastrin mRNA expression was elevated by 35.6% as against the control group （P = 0.15, n =8）. The long-term oral administration of a casomorphin solution significantly decreased the even gray of D-cells,but did not lower the number of D-cells both in the antrum and fundus. Interestingly, the number of G-cells increased in the antrum and fundus, but its average density was augmented only in the antrum.CONCLUSION： Beta-casomorphin-7 is capable of modulating gene expression of the regulatory peptides from G and D cells. Data from in situ hybridization studies indicate that beta-casomorphin-7 affects gastrin gene expression indirectly by means of the paracrine action of somatostatin, and depends on its intrinsic molecular function.

关键词： Beta-casomorphin-7 Adult rat Somatostatin Gastrin Expression

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

基于FPGA的级联逆变器直接PWM发生器

电力系统自动化 2006年第9期30卷 61-63,75页

作者：陈远华刘文华宋强清华大学电机系北京市100084

为实现中高压变频装置在风机、水泵等应用场合的调速控制,研制了基于现场可编程门阵列(FPGA)实现的多电平直接脉宽调制(PWM)脉冲发生器。该脉冲发生器通过总线与主控制器实现数据交换,接收参考电压采样数据,返回功率单元的状态信息,以... 详细信息

为实现中高压变频装置在风机、水泵等应用场合的调速控制,研制了基于现场可编程门阵列(FPGA)实现的多电平直接脉宽调制(PWM)脉冲发生器。该脉冲发生器通过总线与主控制器实现数据交换,接收参考电压采样数据,返回功率单元的状态信息,以模块化方式设计实现PWM脉冲输出。介绍了该脉冲发生器的基本原理、软硬件构成和实现,给出了试验的线电压波形和频谱分析结果。试验结果表明,脉冲发生器脉宽精度高,运行可靠,输出线电压的总谐波畸变率小于3％。

关键词：多电平逆变器现场可编程门阵列(FPGA) 直接PWM方法脉冲发生器

内蕴电压平衡控制的飞跨电容逆变器的PWM方法

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2006年第4期26卷 119-125页

作者：严干贵刘文华穆钢陈远华陈涛东北电力学院电力工程系吉林省吉林市132012 清华大学电机工程与应用电子技术系北京市海淀区100084

采用多电平结构是逆变器实现高电压大容量化的有效途径。飞跨电容逆变器因为只需要一个独立直流供电电源、电平数易扩展、控制灵活等优点而备受青睐,但是电容电压的平衡问题却制约其推广应用。针对此问题,该文提出一种内蕴电压平衡控制... 详细信息

采用多电平结构是逆变器实现高电压大容量化的有效途径。飞跨电容逆变器因为只需要一个独立直流供电电源、电平数易扩展、控制灵活等优点而备受青睐,但是电容电压的平衡问题却制约其推广应用。针对此问题,该文提出一种内蕴电压平衡控制的PWM方法,该方法由直接PWM算法和基于最大单元电压偏差抑制的开关状态选择法则组成,前者是由给定的ABC坐标系下的参考电压来确定逆变器所需输出的电平电压、相应的作用时间及作用顺序;后者是确定逆变器的开关状态以产生已确定的电平电压,同时控制电容电压的平衡。该PWM方法理论上适用于任意电平的飞跨电容逆变器,它不但能够有效控制电容电压的平衡,而且还能够保证功率开关频率的均衡、便于数字化实现。该文给出了该方法的数字化实现原理。最后,基于飞跨电容五电平变频器对所提出的PWM方法,做了详尽的仿真分析和大量的实验验证。

关键词：电力电子多电平逆变器 PWM控制飞跨电容

Molecular subtypes identified by gene expression profiling in early stage endometrioid endometrial adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第19期126卷 3680-3684页

作者： GAO Bao-rong chen Yong-hua YAO yuan-yang LI Xiao-ping WANG jian-liu WEI Li-hui Department of Obstetrics and Gynecology Peking UniversityPeople's Hospital Beijing 100044 China

Background Early stage （FIGO stage Ⅰ-Ⅱ） endometrioid endometrial adenocarcinoma （EEA） is very common in clinical ***,patients with the early stage EEA show various clinical behaviors due to biological ***,we aimed to discover distinct classes of tumors based on gene expression profiling,and analyze whether the molecular classification correlated with the histopathological stages or other clinical *** Hierarchical clustering was performed for class discovery in 28 eady stage EEA samples using a special cDNA microarray chip containing 492 genes designed for endometrial *** between clinicopathologic parameters and our classification were *** the significance analysis of microarrays （SAM） array was used to identify the signature genes according to the tumor grade and myometrial *** Three tumor subtypes （subtypes Ⅰ,Ⅱ and Ⅲ） were identified by hierarchical clustering,each subtype had different clinicopathological factors,such as tumor grade,myometrial invasion status,and FIGO ***,SAM analysis showed 34 up-regulated genes in high grade tumors,and 38 up-regulated genes and 1 down-regulated in deep myometrial invasive *** overlap genes between these two high-risk factors were markedly up-regulated in subtype Ⅰ,but down-regulated in subtype Ⅲ.Conclusion We have identified novel molecular subtypes in early stage *** gene signatures characterize each tumor subtype,which could be used for recognizing the tumor risk and providing a basis for further treatment stratification.

关键词： endometrioid adenocarcinoma molecular classification gene expression profiling risk factor

在线全文

学校读者我要写书评

暂无评论

矿用自卸车驱动桥壳有限元疲劳分析与优化

煤炭技术 2012年第7期31卷 30-31页

作者：陈元华桂林航天工业高等专科学校汽车与动力工程系广西桂林541004

利用有限元软件建立了某自卸汽车驱动桥壳的有限元模型,选择极限工况对其进行了结构强度和刚度分析。基于应力分析结果,利用先进的优化软件OPTISTUCT对桥壳的主体区进行了形状优化,应力集中得到了明显改善。最后,应用疲劳分析软件***对... 详细信息

利用有限元软件建立了某自卸汽车驱动桥壳的有限元模型,选择极限工况对其进行了结构强度和刚度分析。基于应力分析结果,利用先进的优化软件OPTISTUCT对桥壳的主体区进行了形状优化,应力集中得到了明显改善。最后,应用疲劳分析软件***对优化前后桥壳的寿命做了详细的计算,对比了形状优化前后的寿命改变情况。

关键词：驱动桥壳 FEA 疲劳优化