检索结果-南通市图书馆

Depinning Dynamics of Two-Dimensional Charged Colloids on a Random Laser-Optical Substrate

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

Communications in Theoretical Physics 2009年第5期51卷 938-940页

作者： CAO Yi-Gang wang hong-ling YANG Gang HAN hong-Pei School of Physics and Engineering Zhengzhou University Zhengzhou 450001 China Information College of Electronic-Engineering Xuchang University Xuchang 310018 China

Using Langevin simulations, we. investigate the depinning dynamics of two-dimensional charged colloids on a random laser-optical substrate. With an increase in the strength of the substrate, we find a transition from crystal to smectic flows above the depinning. A power-law scaling relationship between average velocity and applied driving force could be obtained for both flows, and we find that the scaling exponents are no bigger than 1 for the crystal and are bigger than 1 for the smectic flows.

关键词： charged colloids laser-optical substrate depinning

Elevation difference of Ca^(2+) levels in young leaf cells of bromegrass and induced cold-tolerant enhancement under different controlled chilling temperatures

在线全文

学校读者我要写书评

暂无评论

Forestry Studies in China 2008年第4期10卷 229-234页

作者： wang hong JIAN ling-cheng Key Laboratory of Photosynthesis and Environmental Molecular Physiology Institute of Botany Chinese Academy of Sciences Beijing 100093 P. R. China

The changes of Ca2＋ levels in young leaf cells of bromegrass under different controlled chilling temperatures were inves- tigated by an antimonite precipitation cytochemical method. The main results were as follows： under 25/20℃ （day/night） tempera- ture and 14 h photoperiod, electron-dense Ca2＋ antimonite precipitates, indicators of Ca2＋ localization, were mainly localized in the vacuoles, cell walls and intercellular spaces; few Ca2＋ deposits were observed in the cytosol and nuclei. After a 3℃ chilling treatment for 3 h, many Ca2＋ precipitates appeared in the cytosol and nuclei, indicating that Ca2＋ influx had occurred in the cytosol and nuclei. When the 3℃ treatment was prolonged to 8 h, more Ca2＋ deposits appeared in the nuclei and cytosol, but the amount of Ca2＋ deposits in both the cytosol and nuclei decreased markedly after a 24 h treatment and most Ca2＋ deposits were returned to the vacuoles and intercellular spaces after an 8 d treatment. When bromegrass was exposed to 7℃ for 3 h, the Ca2＋ distribution in the cells had no visible changes, compared with that of the 25/20℃ grown control plants. However, when the chilling treatment of 7℃ was prolonged to 8 h, a Ca2＋ influx occurred, where many Ca2＋ deposits were observed in the nuclei and cytosol. More Ca2＋ deposits appeared in the nuclei and cytosol after a 24 h treatment, but the amount of Ca2＋ deposits in the cytosol and nuclei was reduced markedly after an 8 d treatment. After a 14 d treatment, the remaining low level of Ca2＋ was recovered in both the cytosol and nuclei and the Ca2＋ deposits were again located in the vacuoles and the intercellular spaces. The dynamics of subcellular Ca2＋ localization in young leaf cells of bromegrass during a 12℃ chilling treatment were similar to those of the 7℃ treatment. Besides, the results showed that the frost tolerance ofbromegrass exposed to 3℃ for 8 d increased by 6℃, for 7℃ and 8 d by 4℃ and for 12℃ and 14 d by 3℃, compared with the controls. Finally, the relatio

关键词： Ca2+-cytochemistry chilling temperature intracellular Ca2+ dynamics cold tolerance Bromus inermis Leyss

在线全文

学校读者我要写书评

暂无评论

地球物理软件体系结构研究

石油地球物理勘探 2008年第5期43卷 606-611,488页

作者：王宏琳河北省涿州市东方地球物理公司物探技术研究中心 072751

本文讨论了应用于油气地球物理领域的一种新型的软件体系结构模型,该模型超越传统的三层体系结构,在每个层分离控制引擎和功能模块逻辑,并包含统一的软件总线和应用框架。文中提出的地球物理软件体系结构模型主体由(中心部分的)交互(UI... 详细信息

本文讨论了应用于油气地球物理领域的一种新型的软件体系结构模型,该模型超越传统的三层体系结构,在每个层分离控制引擎和功能模块逻辑,并包含统一的软件总线和应用框架。文中提出的地球物理软件体系结构模型主体由(中心部分的)交互(UI用户界面)层、应用层、数据层以及系统服务总线和应用框架组成,这些体系结构成分构建在扩展的计算机操作系统平台上。该软件体系结构具有四个基本特征,即层次化、控制引擎与功能模块分离、统一的系统运行服务、基于框架的软件应用开发。文中所提软件体系结构模型,既便于应用集成和数据集成,又便于软件系统开发过程管理、软件维护和性能提升,并可望应用于油气勘探与生产软件产品线的研究与开发。

关键词：地球物理软件软件体系结构软件开发软件平台应用框架软件总线软件产品线

Effect of pcDNA3.1-vascular endothelial growth factor 165 recombined vector on vascular buds in rabbit vertebral cartilage endplate

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第22期125卷 4055-4060页

作者： XU hong-guang CHEN Xiao-hu DING Guo-zheng wang hong wang ling-ting CHEN Xue-wu Yijishan Hosp Wannan Med Coll Dept Orthopaed Wuhu 241001 Anhui Peoples R China

Background This study aimed to investigate the effect of pcDNA3.1-vascular endothelial growth factor （VEGF）165 vector on vertebral cartilage endplate vascular buds and intervertebral discs. Methods Rabbits were randomly assigned to the control and experimental groups with 10 in each. In the experimental group, we anesthetized the rabbits and exposed the front vertebral body. Using the mark of the longitudinal ossature of the front vertebral body of the lumbar vertebrae, we advanced a needle at the central point of the front fourth and fifth lumbar intervertebral discs and injected 20 pl pcDNA3.1-VEGF165. Similarly, in the control group, we injected 20 IJl pcDNA3.1. At 4 and 8 weeks post-injection, we examined the changes of the vertebral cartilage endplate using X-ray radiograph, histology, and scanning electron microscopy. Results The vertebral cartilage endplate calcification and degeneration in the experimental group were less than those in the control group at 8 weeks post-operation. The average number and diameter of vascular buds obviously increased in the experimental group at 4 and 8 weeks post-operation. The number of vascular buds and the diameter in the region of the inner annulus increased when compared to those in the area near the nucleus pulposus. Conclusions The pcDNA3.1-VEGF165 plasmid can increase the average number and diameter of vascular buds and decelerate intervertebral disc degeneration.

关键词： vascular endothelial growth factor vertebral cartilage endplate vascular corrosion casting

Robot SLAM with Ad hoc wireless network adapted to search and rescue environments

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2018年第12期25卷 3033-3051页

作者： wang hong-ling ZHANG Cheng-jin SONG Yong PANG Bao School of Control Science and Engineering Shandong University School of Mechanical Electrical and Information Engineering Shandong University at Weihai

An innovative multi-robot simultaneous localization and mapping(SLAM)is proposed based on a mobile Ad hoc local wireless sensor network(Ad-WSN).Multiple followed-robots equipped with the wireless link RS232/485module act as mobile nodes,with various on-board sensors,Tp-link wireless local area network cards,and Tp-link wireless *** master robot with embedded industrial PC and a complete robot control system autonomously performs the SLAM task by exchanging information with multiple followed-robots by using this self-organizing mobile wireless *** PC on the remote console can monitor multi-robot SLAM on-site and provide direct motion control of the *** mobile Ad-WSN complements an environment devoid of usual GPS signals for the robots performing SLAM task in search and rescue *** post-disaster areas,the network is usually absent or variable and the site scene is cluttered with *** adapt to such harsh situations,the proposed self-organizing mobile Ad-WSN enables robots to complete the SLAM process while improving the performances of object of interest identification and exploration area *** information of localization and mapping can communicate freely among multiple robots and remote PC control center via this mobile ***,the autonomous master robot runs SLAM algorithms while exchanging information with multiple followed-robots and with the remote PC control center via this local WSN *** and experiments validate the improved performances of the exploration area coverage,object marked,and loop closure,which are adapted to search and rescue post-disaster cluttered environments.

关键词： search and rescue environments local Ad-WSN robot simultaneous localization and mapping distributed particle filter algorithms coverage area exploration

在线全文

学校读者我要写书评

暂无评论

一种高碳钢低温干摩擦行为的研究

摩擦学学报 2008年第5期28卷 469-474页

作者：王鸿灵阎逢元中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州730000 中国科学院研究生院北京100039

在20℃至-55℃范围内以球-盘摩擦形式考察了一种1.08%C高碳钢在滑动速度0.319 m/s,载荷在0.5～2.5 N下与GCr15钢球干摩擦时的摩擦磨损行为,利用SEM、EDS、XPS等观察了磨痕形貌,考察了磨屑中氧含量的变化,分析了摩擦氧化反应.结果发现,... 详细信息

在20℃至-55℃范围内以球-盘摩擦形式考察了一种1.08%C高碳钢在滑动速度0.319 m/s,载荷在0.5～2.5 N下与GCr15钢球干摩擦时的摩擦磨损行为,利用SEM、EDS、XPS等观察了磨痕形貌,考察了磨屑中氧含量的变化,分析了摩擦氧化反应.结果发现,与常温环境相比,在0℃以下的低温环境显著提高了该钢铁摩擦副之间的摩擦系数,且摩擦系数基本不随温度发生变化.随着温度的降低该高碳钢的磨损量增加,黏着磨损程度增强,屑中氧含量减小.分析认为温度的降低伴随着湿度的降低,低温、低湿度环境减弱了摩擦氧化反应,减少了起隔离作用的金属氧化物的生成,加剧了摩擦副之间的黏着,从而导致摩擦系数和磨损量增大.

关键词：低温高碳钢干摩擦摩擦氧化反应

Association of genetic variations of the prostasin gene with essential hypertension in the Xinjiang Kazakh population

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第14期124卷 2107-2112页

作者： LI Nan-fang ZHANG Ju-hong CHANG Jian-hang YANG Jin wang hong-mei ZHOU ling LUO Wen-li Department of Hypertension People's Hospital of Xinjiang Uygur Autonomous Region Center of Diagnosis Treatment and Research of Hypertension in Xinjiang Urumqi Xinjiang 830001 China

Background Transgenic overexpression of human prostasin in rats disturbs salt balance and causes hypertension. We investigated whether genetic variations in prostasin were implicated in hypertension or related phenotypes in the Xinjiang Kazakh *** We sequenced all exons and the promoter regions of the prostasin gene in 94 hypertensive individuals, and the genotype identification was performed by the TaqMan polymerase chain reaction method. Case-control studies were conducted in 938 Kazakh *** E342K and 2827G＞A, which are novel variants, were successfully genotyped in the general Xinjiang Kazakh population with a sample size of 938 individuals （406 men and 532 women）. Only one hypertensive patient was identified with the E342K mutation. No significant association was observed between 2827G＞A and hypertension. However,quantitative traits of hypertensive intermediate phenotypes were significantly associated with the A allele; P=-0.041 and 0.034 for body mass index （BMI） in the additive and recessive models, P=0.042 and 0.018 for OGTT-2h glucose in the additive and recessive models, P=0.031 for IRT-3h insulin in the recessive model, and P=0.038 for serum potassium in the dominant *** This study does not provide evidence of a major role of prostasin variation in blood pressure ***, association of prostasin polymorphisms with hypertension and metabolic effects can be observed in our population. Further investigation is warranted to clarify the relevance of prostasin polymorphisms to blood pressure regulation.

关键词： essential hypertension prostasin genetic variation intermediate phenotypes

Overexpression of dishevelled-1 attenuates wortmannin-induced hyperphosphorylation of cytoskeletal proteins in N2a cell

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2005年第6期26卷 679-684页

作者： Hai-hong wang, Ai-hong ZHANG, ling-qiang ZHU, Qun wang, Jian-zhi wang~2 Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China DepartmentofPathophysiology TongjiMedicalCollegeHuazhongUniversityofScienceandTechnologyWuhan430030China

Aim: To investigate the effect of dishevelled-1 (DVL-1) on wortmannin-induced Alzheimer-like hyperphosphorylation of cytoskeletal proteins in mouse neuroblastoma 2a (N2a) cells. Methods: Cultured N2a cells were transitorily transfected with DVL-1 expression plasmid using Lipofectamine鈩?2000. Western blot and immunofluorescence microscopy were used to measure the phosphorylation of neurofilament and tau. Results: Level of phosphorylated neurofilament at SMI31 epitope and phosphorylated tau determined by PHF-1 was increased at 1 h and 3 h and back to normal at 6 h after wortmannin 1 |imol/L treatment. The highest level of phosphorylated neurofilament and phosphorylated tau was seen at 1 h and 3 h after wortmannin treatment, respectively. When DVL-1 protein was overexpressed, the hyperphosphorylation of neurofilament at SMI31 and SMI32 epitopes and tau atPHF-l(Ser-396/404),M4(Thr-231/Ser-235),andTau-l(Ser-198/199/202)epitopes was attenuated. Conclusion: Overexpression of mouse DVL-1 protein inhibits wortmannin-induced hyperphosphorylation of neurofilament and tau in N2a cells.

关键词： Alzheimer disease tau proteins neurofilament wortmannin dishevelled-1

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

民营企业“走出去”与竞争力分析

江苏行政学院学报 2009年第5期 53-58页

作者：王红领中国社会科学院经济研究所北京100872

现阶段我国民营企业"走出去"还处于以对外出口为主,除少数个案外,大多数民营企业对外投资活动尚处于试探性的摸索阶段,在"走出去"的道路上还有很长一段路要走。尽管如此,在一些竞争性领域和劳动密集型产业,我国的民营企业已经具备了较... 详细信息

现阶段我国民营企业"走出去"还处于以对外出口为主,除少数个案外,大多数民营企业对外投资活动尚处于试探性的摸索阶段,在"走出去"的道路上还有很长一段路要走。尽管如此,在一些竞争性领域和劳动密集型产业,我国的民营企业已经具备了较强的竞争实力。因此,对那些处在具有比较优势产业中的民营企业,"走出去"战略为其开展国际贸易、开拓国际市场提供了更加广阔的发展空间。

关键词：民营企业 “走出去” 竞争力