期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
铁路信号工程施工及电路导通 被引量:8
1
作者 唐飞 《交通科技与经济》 2009年第3期83-84,共2页
铁路信号对列车运行安全和时间疏导起到重要保障作用,信停期间应从制定严密的施工方案和做好配合工作两方面来做好铁路信号施工方案的组织工作。对铁路信号导通中的故障处理进行分析,提出故障处理措施,该方法能达到缩短信停时间,优化施... 铁路信号对列车运行安全和时间疏导起到重要保障作用,信停期间应从制定严密的施工方案和做好配合工作两方面来做好铁路信号施工方案的组织工作。对铁路信号导通中的故障处理进行分析,提出故障处理措施,该方法能达到缩短信停时间,优化施工组织的目的。 展开更多
关键词 铁路信号 施工组织 电路导通
下载PDF
再论信号工程施工中的电路导通
2
作者 薛保都 《西铁科技》 2003年第B11期18-19,共2页
作者通过多年的实践经验,概述了导通工作的三步走,即导通前的准备工作、导通中的故障处理及模拟连锁试验。
关键词 铁路信号 信号工程施工 电路导通 故障处理 模拟连锁试验 电路检查
下载PDF
铁路信号工程施工及电路导通工作研究
3
作者 齐大卫 《中文科技期刊数据库(全文版)工程技术》 2021年第5期83-83,85,共2页
铁路信号有助于保证列车的平稳性运行,提升列车运行的安全系数,在实际工作中需要加强对铁道信号工程施工质量提升的重视程度,制定与之匹配的施工方案,从而为后续施工奠定坚实的基础,与此同时在实际施工时还需要做好电路导通工作,保证信... 铁路信号有助于保证列车的平稳性运行,提升列车运行的安全系数,在实际工作中需要加强对铁道信号工程施工质量提升的重视程度,制定与之匹配的施工方案,从而为后续施工奠定坚实的基础,与此同时在实际施工时还需要做好电路导通工作,保证信号的正常传输,明确电路在后续运行过程中所存在的问题以及困扰,以缩短通行时间、优化施工组织为主来开展日常的工作,从而推动我国铁路行业的稳定性发展。 展开更多
关键词 铁路信号工程 电路导通 施工要点
下载PDF
铁路信号工程施工及电路导通分析
4
作者 凌辉 《中文科技期刊数据库(全文版)工程技术》 2021年第3期167-168,共2页
作为一种非常重要的安全运输工具,铁路主要依靠铁路信号,铁路信号必须通过铁路信号设备进行收发。近年来,中国铁路建设的飞速发展必将导致铁路信号设备的发展和变化,这些变化主要体现在设备部件和设备产品的科技含量逐年增加。由于复杂... 作为一种非常重要的安全运输工具,铁路主要依靠铁路信号,铁路信号必须通过铁路信号设备进行收发。近年来,中国铁路建设的飞速发展必将导致铁路信号设备的发展和变化,这些变化主要体现在设备部件和设备产品的科技含量逐年增加。由于复杂的技术条件,高标准要求和测试项目。多种准确的测试技术指标特征。但是,随着铁路速度的不断提高,中国铁路部门对现有铁路信号设备的维护和施工质量也在不断提高。在此过程中出现了一些问题,例如铁路信号工程建设和电路导通问题,因此本文将对这两个问题进行分析,并首先在信号中断期间与铁路信号工程建设组织合作,分析该方法。接下来,将分析铁路信号的施工,以及电路导通的关键。 展开更多
关键词 铁路信号工程 工程施工 电路导通
下载PDF
铁路信号工程施工及电路导通 被引量:2
5
作者 贾岛 《科技交流》 2011年第2期126-128,共3页
铁路信号对列车运行安全和时间疏导起到重要保障作用,信停期间应从制定严密的施工方案和做好配合工作两方面来做好铁路信号施工方案的组织工作.对铁路信号导通中的故障处理进行分析,提出故障处理措施,该方法能达到缩短信停时间,优... 铁路信号对列车运行安全和时间疏导起到重要保障作用,信停期间应从制定严密的施工方案和做好配合工作两方面来做好铁路信号施工方案的组织工作.对铁路信号导通中的故障处理进行分析,提出故障处理措施,该方法能达到缩短信停时间,优化施工组织的目的. 展开更多
关键词 铁路信号 施工组织 电路导通 模拟试验
原文传递
铁路信号工程施工及电路导通
6
作者 单桂元 《科学中国人》 2017年第1X期26-,共1页
铁路作为一种很重要的安全的运输工具,它主要靠的是铁路信号,而铁路信号要进行发送和传输就必须依靠铁路信号设备。近几年我国铁路建设的发展突飞猛进,必然带动着铁路信号设备的发展变化,这些变化主要体现在设备组成部件及器材产品中的... 铁路作为一种很重要的安全的运输工具,它主要靠的是铁路信号,而铁路信号要进行发送和传输就必须依靠铁路信号设备。近几年我国铁路建设的发展突飞猛进,必然带动着铁路信号设备的发展变化,这些变化主要体现在设备组成部件及器材产品中的科技含量逐年增加,表现为技术条件复杂、标准要求高、试验项目多、测试技术指标精确的特点,但是随着铁路速度的不断提高,我国铁路部门对现有的铁路信号设备的维修和施工质量也越来越高,在这个过程中就出现了一些问题,如铁路信号工程的施工及电路的导通问题,因此本文就这两方面问题进行了分析,先分析了信停期间的铁路信号工程施工组织以及配合工作的方式,接下来分析了铁路信号施工导通,这两个方面是电路导通的关键所在。 展开更多
关键词 铁路信号 施工 电路导通
下载PDF
铁路信号工程施工及电路导通
7
作者 米玉强 《中国科技期刊数据库 工业A》 2015年第10期210-210,共1页
铁路经过6 次大提速之后,对既有线铁路信号设备的维修和施工质量要求越来越严格,对信号设备更新、改造和大修及新旧设备更替时间的要求也越来越短。本文分析了铁路信号工程施工管理及电路导通施工。
关键词 铁路信号工程 施工管理 电路导通施工
下载PDF
高压LDMOS导通电阻的高温特性
8
作者 朱德智 柯导明 陈军宁 《安徽电子信息职业技术学院学报》 2002年第2期54-58,共5页
这篇文章提出了高压LDMOS的高温等效电路,并在此基础上讨论了LDMOS泄漏电流及其本征参数在25℃-300℃范围内随温度变化规律。根据本文分析,漏pn结的反向泄漏电流决定了LD-MOS的高温及限温度,导通电阻与温度的关系是(T)Z(Z=1.5~2.5)。
关键词 高压LDMOS 电阻 高温等效电路
下载PDF
典型单相非线性负荷的精确谐波模型及其谐波衰减特性 被引量:12
9
作者 雍静 肖兵 《中国电机工程学报》 EI CSCD 北大核心 2014年第19期3210-3219,共10页
针对基于不可控桥式整流电容滤波电路的单相非线性负荷,建立精确的频域谐波模型,该模型得到仿真和实验的验证,可用于对该类非线性负荷的谐波衰减特性进行研究。通过基于模型的分析研究,提出2个表征谐波衰减特性的新指标,即电路导通角衰... 针对基于不可控桥式整流电容滤波电路的单相非线性负荷,建立精确的频域谐波模型,该模型得到仿真和实验的验证,可用于对该类非线性负荷的谐波衰减特性进行研究。通过基于模型的分析研究,提出2个表征谐波衰减特性的新指标,即电路导通角衰减系数和电压峰值衰减系数。仿真结果表明,这2个指标与该类非线性负荷的电流谐波总衰减系数有较好的相关性,可以较好地反映系统电压畸变对该类负荷电流谐波特性的影响,揭示了其谐波衰减效应发生的原因,并在一定程度上实现了对非线性负荷谐波衰减效应的定量分析。 展开更多
关键词 谐波 非线性负荷 衰减效应 电路导通角衰减系数 电压峰值衰减系数
下载PDF
Improvement of Electrical Performance of SOI-LIGBT by Resistive Field Plate
10
作者 杨洪强 韩磊 陈星弼 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第10期1014-1018,共5页
The electrical performance including breakdown voltage and turn-off speed of SOI-LIGBT is improved by incorporating a resistive field plate (RFP) and a p-MOSFET.The p-MOSFET is controlled by a signal detected from a p... The electrical performance including breakdown voltage and turn-off speed of SOI-LIGBT is improved by incorporating a resistive field plate (RFP) and a p-MOSFET.The p-MOSFET is controlled by a signal detected from a point of the RFP.During the turning-off of the IGBT,the p-MOSFET is turned on,which provides a channel for the excessive carriers to flow out of the drift region and prevents the carriers from being injected into the drift region.At the same time,the electric field affected by the RFP makes the excessive carriers flow through a wider region,which almost eliminates the second phase of the turning-off of the SOI-LIGBT caused by the substrate bias.Faster turn-off speed is achieved by above two factors.During the on state of the IGBT,the p-MOSFET is off,which leads to an on-state performance like normal one.At least,the increase of the breakdown voltage for 25% and the decrease of the turn-off time for 65% can be achieved by this structure as can be verified by the numerical simulation results. 展开更多
关键词 resistive field plate dynamic controlled anode-short turn-off time breakdown voltage forward voltage drop
下载PDF
Cardiotrophin-1 promotes cardiomyocyte differentiation from mouse induced pluripotent stem cells via JAK2/STAT3/Pim-1 signaling pathway 被引量:2
11
作者 Tong LIU Ran ZHANG +8 位作者 Tao GUO Sai MA Dong HAN Xiu-Juan LI Yan JIN Miao-Miao FAN Ya-Bin WANG Yun-Dai CHEN Feng CAO 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2015年第6期591-599,共9页
Background The induced pluripotent stem cell (iPSC) has shown great potential in cellular therapy of myocardial infarction (MI), while its application is hampered by the low efficiency of cardiomyocyte differentia... Background The induced pluripotent stem cell (iPSC) has shown great potential in cellular therapy of myocardial infarction (MI), while its application is hampered by the low efficiency of cardiomyocyte differentiation. The present study was designed to investigate the effects of cardiotrophin-1 (CT-1) on cardiomyocyte differentiation from mouse induced pluripotent stem cells (miPSCs) and the underlying mechanisms involved. Methods The optimal treatment condition for cardiomyocyte differentiation from miPSCs was established with ideal concentration (10 ng/mL) and duration (from day 3 to day 14) of CT-1 administration. Up-regulated expression of cardiac specific genes that accounted for embryonic cardiogenesis was observed by quantitative RT-PCR. Elevated amount of a-myosin heavy chain (ct-MHC) and cardiac troponin I (cTn I) positive cells were detected by immunofluorescence staining and flow cytometry analysis in CT- 1 group. Results Transmission electron microscopic analysis revealed that cells treated with CT- 1 showed better organized sacromeric structure and more mitochondria, which are morphological characteristic of matured cardiomyocytes. Western blot demonstrated that CT-1 promotes cardiomyocyte differentiation from miPSCs partly via JAK2/STAT3/Pim-1 pathway as compared with control group. Conclusions These findings suggested that CT-1 could enhance the cardiomyocyte differentiation as well as the maturation of mouse induced pluripotent stem cell derived cardiomyocytes by regulating JAK2/STAT3/Pim-1 signaling pathway. 展开更多
关键词 Cardiac differentiation CARDIOTROPHIN-1 Mouse induced pluripotent stem cells PIM-1
下载PDF
培养学生创新思维与能力的算法分析案例
12
作者 朱力强 《计算机与信息技术》 2007年第11期52-54,共3页
高校教学中的创新性思维和能力的培养直接决定国家和民族的未来。通过对电路导通可能性和哥德巴赫猜想的算法实现,讨论了算法的导通概率、对比分析了算法的T(n)和S(n),实际运行结果表明,优秀的算法案例或题库结合C/S架构的MSSE能提高学... 高校教学中的创新性思维和能力的培养直接决定国家和民族的未来。通过对电路导通可能性和哥德巴赫猜想的算法实现,讨论了算法的导通概率、对比分析了算法的T(n)和S(n),实际运行结果表明,优秀的算法案例或题库结合C/S架构的MSSE能提高学生自我学习、考试和评估的效率,提高学生在算法实现和分析上的兴趣和能力,从而增强学生在算法实现中的创新能力。 展开更多
关键词 电路导通 模拟 哥德巴赫猜想 算法分析
原文传递
Screening possible solid electrolytes by calculating the conduction pathways using Bond Valence method 被引量:6
13
作者 GAO Jian CHU Geng +4 位作者 HE Meng ZHANG Shu XIAO RuiJuan LI Hong CHEN LiQuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第8期1526-1535,共10页
Inorganic solid electrolytes have distinguished advantages in terms of safety and stability, and are promising to substitute for conventional organic liquid electrolytes. However, low ionic conductivity of typical can... Inorganic solid electrolytes have distinguished advantages in terms of safety and stability, and are promising to substitute for conventional organic liquid electrolytes. However, low ionic conductivity of typical candidates is the key problem. As connective diffusion path is the prerequisite for high performance, we screen for possible solid electrolytes from the 2004 International Centre for Diffraction Data (ICDD) database by calculating conduction pathways using Bond Valence (BV) method. There are 109846 inorganic crystals in the 2004 ICDD database, and 5295 of them contain lithium. Except for those with toxic, radioactive, rare, or variable valence elements, 1380 materials are candidates for solid electrolytes. The rationality of the BV method is approved by comparing the existing solid electrolytes' conduction pathways we had calculated with those from ex- periments or first principle calculations. The implication for doping and substitution, two important ways to improve the conductivity, is also discussed. Among them LizCO3 is selected for a detailed comparison, and the pathway is reproduced well with that based on the density functional studies. To reveal the correlation between connectivity of pathways and conductivity, a/γ-LiAlO2 and Li2CO3 are investigated by the impedance spectrum as an example, and many experimental and theoretical studies are in process to indicate the relationship between property and structure. The BV method can calculate one material within a few minutes, providing an efficient way to lock onto targets from abundant data, and to investigate the struc- ture-property relationship systematically. 展开更多
关键词 solid electrolyte conduction pathway Bond Valence method material screening lithium-ion battery
原文传递
Regulation of tissue repair and regeneration by electric fields 被引量:4
14
作者 王恩彤 赵敏 《Chinese Journal of Traumatology》 CAS 2010年第1期55-61,共7页
Endogenous electric fields (EFs) have been detected at wounds and damaged tissues. The potential roles of EFs in tissue repair and regeneration have been an intriguing topic for centuries. Recent researches have pro... Endogenous electric fields (EFs) have been detected at wounds and damaged tissues. The potential roles of EFs in tissue repair and regeneration have been an intriguing topic for centuries. Recent researches have provided significant insights into how naturally occurring EFs may participate in the control of tissue repair and regeneration. Applied EFs equivalent to the size of fields measured in vivo direct cell migration, cell proliferation and nerve sprouting at wounds. More remarkably, physiological EFs are a guidance cue that directs cell migration which overrides other well accepted directional signals including initial injury stimulation, wound void, contact inhibition release, population pressure and chemotaxis. EFs activate many intracellular signaling pathways in a directional manner. Modulation of endogenous wound EFs affects epithelial cell migration, cell proliferation, and nerve growth at cornea wounds in vivo. Electric stimulation is being tested clinically for the treatments of bone fracture, wound healing and spinal cord injury. EFs thus may represent a novel type of signaling paradigm in tissue repair and regeneration. Combination of the electric stimulation and other well understood biochemical regulatory mechanisms may offer powerful and effective therapies for tissue repair and regeneration. This review introduces experimental evidence for the existence of endogenous EFs and discusses their roles in tissue repair and regeneration. 展开更多
关键词 Guided tissue regeneration Wound healing Electromagnetic fields
原文传递
Protective paracrine effect of mesenchymal stem cells on cardiomyocytes 被引量:7
15
作者 Mei-xiang XIANG Ai-na HE Jian-an WANG Chun GUI 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2009年第8期619-624,共6页
Objective: The aim of this study was to test the protective effect of mesenchymal stem cells (MSCs) on cardiomyocytes in vitro and to investigate the anti-apoptotic signaling pathway. Methods: MSCs from Sprague-Da... Objective: The aim of this study was to test the protective effect of mesenchymal stem cells (MSCs) on cardiomyocytes in vitro and to investigate the anti-apoptotic signaling pathway. Methods: MSCs from Sprague-Dawley (SD) rats were separated and cultured. MSC medium was collected from MSCs (DMEM) under hypoxia. Cultured cardiomyocytes from neonatal cultured in serum-free Dulbecco's modified eagle medium SD rats were exposed to hypoxia/reoxygenation (H/R) and treated with MSC medium. The apoptotic cardiomyocytes were stained with Annexin-V-fluorescein isothiocyanate (FITC), Hoechst 33342 and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL). The mitochondrial transmembrane potential of cardiomyocytes was assessed using a fluorescence microscope. The expression of Bcl-2, Bax, cyto- chrome C, apoptosis-induced factor (AIF), and caspase-3 was tested by Western blot analysis. Results: Our data demonstrated that MSC medium reduced H/R-induced cardiomyocyte apoptosis, increased the Bcl-2/Bax ratio, and reduced the release of cyto- chrome C and AIF from mitochondria into the cytosol. Conclusion: MSCs protected the cardiomyocytes from H/R-induced apoptosis through a mitochondrial pathway in a paracrine manner. 展开更多
关键词 Mesenchymal stem cell (MSC) APOPTOSIS Mitochondrial transmembrane potential Hvpoxia/reoxygenation (H/R)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部