检索结果-南通市图书馆

Hepatobiliary & Pancreatic Diseases International 2021年第2期20卷 105-107页

作者： jian-Gang Zhang hua-Yu Yang yi-Lei Mao Department of Liver Surgery Peking Union Medical College(PUMC)HospitalPUMC&Chinese Academy of Medical Sciences(CAMS)Beijing 100730China

Liver plays a central role in various physiological functions,including metabolism,biliary secretion,production of plasma proteins,regulation of hormones as well as *** of its multidimensional functions,liver diseases such as viral hepatitis,non-alcoholic fatty liver disease,non-alcoholic steato-hepatitis,fibrosis and liver cancer may lead to serious consequences.

关键词： metabolism liver Liver

在线全文

学校读者我要写书评

暂无评论

美、日、中服装社会心理学研究和教育的比较

天津工业大学学报 2004年第5期23卷 36-39页

作者：郭平建吕逸华况灿北京服装学院外语系北京100029

通过对美、日、中在服装社会心理学的研究和教育概况的比较,探讨我国与上述两国在这一领域的差距及其原因,并提出有关改进建议,旨在促进我国在该领域研究与教育的进一步深入开展,提高我国服装研究的整体水平.具体建议包括:重视服装社会... 详细信息

通过对美、日、中在服装社会心理学的研究和教育概况的比较,探讨我国与上述两国在这一领域的差距及其原因,并提出有关改进建议,旨在促进我国在该领域研究与教育的进一步深入开展,提高我国服装研究的整体水平.具体建议包括:重视服装社会心理学的研究与教育,投入一定的研究经费;在学术界成立专门性的研究机构,加强该领域的研究;积极争取各种媒体的介入,增强人们对服装文化含义的理解;建立、健全学术机构、研究人员与企业沟通的渠道;加强高校对服装社会心理学等理论课的教学与研究.

关键词：服装社会心理学服装理论腋装教育

Development of samarium–cobalt rare earth permanent magnetic materials

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2014年第6期33卷 633-640页

作者： jian-Hong yi Faculty of Materials Science and Engineering Kunming University of Science and Technology

Samarium–cobalt rare-earth（Sm–Co-RE） permanent magnetic materials with large magnetic energy product, high coercive force, high Curie temperature, good thermal stability, and corrosion resistance, have wide potential applications in aerospace, microwave communications, instrumentation, electrical engineering, magnetic machinery, etc. In this paper, the development of Sm–CoRE permanent magnetic materials in the following aspects in recent years was summarized： Sm–Co-RE permanent magnets with high application temperatures, positive temperature coefficients of coercive force, zero temperature coefficients of residual magnetization, high resistance rate,high mechanical property, and nanocrystallization.

关键词： Samarium–cobalt rare-earth permanent magnet Magnetic Temperature coefficient Resistivity

Intensity Dependence of Cesium D_(2)-Line Saturation Spectra

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第6期13卷 424-427页

作者： LI yi-min CHEN Xu-zong GAN jian-hua JI Wang-xi hua Jing-shan YANG Dong-hai WANG yi-qiu Department of Radio-Electronics Peking UniversityBeijing 100871

The intensity dependence of the cesium D_(2)-line saturation absorption spectra in a nearly zero magnetic field was investigated theoretically and *** using rate equations the D_(2)-line saturation absorption spectra were calculated,which agree reasonably well with the experimental *** variation of the spectra with different cell lengths was also reported and explained with theoretical calculation.

关键词： calculation. spectra saturation

A Refined Model of Three-roller Elastoplastic Asymmetrical Pre-bending of Plate

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 Iron and Steel Research International 2014年第3期21卷 328-334页

作者： Zhi-qiang ZHANG jian-li SONG jian-hua FU Yong-tang LI yi-na GUO School of Material Science and Engineering Taiyuan University of Science and Technology

The geometry of plate after edge pre-bending mode is compared with that after roll-bending mode and the relationship among edge pre-bending angle, pre-bending edge length, and cylindrical desired radius is presented for a three-roller plate bender with bottom rollers adjustable horizontally. The analytical moment-curvature model and springhaek model for pure bending are established, assuming that the stress-strain relationship of material is linear, and the material is in plain strain and yields according to Mises yield criterion. The mathematical model for three- roller edge pre-bending of plate is developed considering the effect of pre-bending edge length, bottom roller radius, friction between plate and roller, etc. The plate tensile test and plate bending test are done and the numerical results agree well with the test data. The results are shown graphically and analyzed in the following aspects：（1） the error between numerical results and test data of top roiler force; （2） the influence of bottom roller radius, relative curva- ture, and bending arc length on springback angle; （3） the relationship between springhack ratio and edge pre-ben- ding angle.

关键词： plate~ elastoplastic~ three-roller edge pre-bending~ asymmetrizal bending~ springback

Crystal Structure of Lithium Yttrium Borate LiY_6O_5(BO_3)_3

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第10期25卷 1175-1178页

作者： GAO jian-hua Beijing Center for Crystal Research and Development Technical Institute of Physics and Chemistry The Chinese Academy of Sciences Beijing 100080 China

Single crystals of LiY6O5（BO3）3 were obtained by the flux method and its structure was determined by a four-circle automatic diffractometer with a MoKα radiation. It crystallizes in monoclinic, space group P21/n with a = 8.330（3）, b = 15.444（4）, c = 8.780（3）°A,β = 91.85（3）°, V = 1129.0（6）°A^3, Z = 4, Mr= 796.83, F（000） = 1456, μ = 30.567 mm^-1, Dc= 4.688 g/cm^3, the final R = 0.0722 and wR = 0.1304. It exhibits a three-dimensional fiamework of yttrium-oxygen polyhedra interconnected by common edges and corners. B and Li atoms are located in the planes and cavities formed by oxygen atoms, respectively.

关键词： borate lithium yttrium borate single-crystal structure VUV luminescent materials

Role of permafrost in resilience of social-ecological system and its spatio-temporal dynamics in the source regions of Yangtze and Yellow Rivers

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第1期16卷 179-194页

作者： FANG yi-ping ZHU Fu-biao yi Shu-hua QIU Xiao-ping DING Yong-jian Institute of Mountain Hazards and Environment Chinese Academy of Sciences College of Resource and Environment University of Chinese Academy of Sciences School of Economics Hefei University of Technology School of Geographic Sciences Nantong University College of Geography and Resources Science Sichuan Normal University State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

Permafrost is one of the key components of terrestrial ecosystem in cold regions. In the context of climate change, few studies have investigated resilience of social ecological system(SER) from the perspective of permafrost that restricts the hydrothermal condition of alpine grassland ecosystem. In this paper, based on the structural dynamics, we developed the numerical model for the SER in the permafrost regions of the source of Yangtze and Yellow Rivers, analyzed the spatial-temporal characteristics and sensitivity of the SER, and estimated the effect of permafrost change on the SER. The results indicate that: 1) the SER has an increasing trend, especially after 1997, which is the joint effect of precipitation, temperature, NPP and ecological conservation projects; 2) the SER shows the spatial feature of high in southeast and low in northwest,which is consistent with the variation trends of high southeast and low northwest for the precipitation, temperature and NPP, and low southeast and high northwest for the altitude; 3) the high sensitive regions of SER to the permafrost change have gradually transited from the island distribution to zonal and planar distribution since 1980, moreover, the sensitive degree has gradually reduced; relatively, the sensitivity has high value in the north and south, and low value in the south and east; 4) the thickness of permafrost active layer shows a highly negative correlation with the SER. The contribution rate of permafrost change to the SER is-4.3%, that is, once the thickness of permafrost active layer increases 1 unit, the SER would decrease 0.04 units.

关键词： Resilience of social ecological system Permafrost Permafrost active layer thickness Structural dynamic equation Source regions of Yangtze and Yellow rivers

Unraveling the macroevolution of horseshoe bats(Chiroptera: Rhinolophidae: Rhinolophus)

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2023年第1期44卷 169-182页

作者： Wei-jian Guo yi Wu Kai He yi-Bo Hu Xiao-Yun Wang Wen-hua Yu Key Laboratory of Conservation and Application in Biodiversity of South China School of Life SciencesGuangzhou UniversityGuangzhouGuangdong 510000China CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China

Unraveling the diversification mechanisms of organisms is a fundamental and important macroevolutionary question regarding the diversity,ecological niche, and morphological divergence of life. However, many studies have only explored diversification mechanisms via isolated factors. Here,based on comparative phylogenetic analysis, we performed a macroevolutionary examination of horseshoe bats(Chiroptera: Rhinolophidae:Rhinolophus), to reveal the inter-relationships among diversification, intrinsic/extrinsic factors, and climatic ecological niche characteristics. Results showed a general slowing trajectory during diversification, with two dispersal events from Asia into Southeast Asia and Africa playing key roles in shaping regional heterogeneous diversity. Morphospace expansions of the investigated traits(e.g., body size,echolocation, and climate niche) revealed a decoupled pattern between diversification trajectory and trait divergence, suggesting that other factors(e.g., biotic interactions) potentially played a key role in recent diversification. Based on ancestral traits and pathway analyses, most Rhinolophus lineages belonging to the same region overlapped with each other geographically and were positively associated with the diversification rate, implying a competitive prelude to speciation. Overall, our study showed that multiple approaches need to be integrated to address diversification history. Rather than a single factor, the joint effects of multiple factors(biogeography, environmental drivers, and competition) are responsible for the current diversity patterns in horseshoe bats, and a corresponding multifaceted strategy is recommended to study these patterns in the future.

关键词： Diversification Rhinolophus Historical biogeography Abiotic/Biotic factors Climatic niche characteristics Competition

在线全文

学校读者我要写书评

暂无评论

黄芪注射液对小鼠免疫性肝损伤的保护作用

天津医科大学学报 2004年第2期10卷 190-191页

作者：刘印忠马德禄高建华康毅天津医科大学基础医学院药理教研室天津300070

目的 :探讨黄芪注射液对免疫性肝损伤的预防保护作用。方法 :采用静脉注射卡介苗(BCG)和脂多糖(LPs)复制免疫性肝损伤模型 ,观察黄芪注射液对肝损伤的影响。结果 :黄芪注射液显著降低了肝损伤小鼠的血清丙氨酸氨基转移酶 (ALT)、天门冬... 详细信息

目的 :探讨黄芪注射液对免疫性肝损伤的预防保护作用。方法 :采用静脉注射卡介苗(BCG)和脂多糖(LPs)复制免疫性肝损伤模型 ,观察黄芪注射液对肝损伤的影响。结果 :黄芪注射液显著降低了肝损伤小鼠的血清丙氨酸氨基转移酶 (ALT)、天门冬氨酸氨基转移酶 (AST)的含量和脾脏系数。结论 :提示黄芪注射液具有预防保护免疫性肝损伤的作用。

关键词：黄芪注射液免疫性肝损伤模型 ALT AST

在线全文

学校读者我要写书评

暂无评论

卵巢癌的病因流行病学研究进展

国外医学（妇幼保健分册） 2004年第6期15卷 382-384页

作者：杨建华石一复浙江大学医学院附属妇产科医院妇产科浙江杭州310006

卵巢癌因发病隐匿,就诊时多已届晚期,治疗效果及预后很差,积极开展病因学研究及早期阻断卵巢癌的诱因很有必要。该文复习了近几年有关卵巢癌的病因流行病学文献,从环境、生殖、行为和遗传因素4个方面进行综述,发现卵巢癌的发生与以上诸... 详细信息

卵巢癌因发病隐匿,就诊时多已届晚期,治疗效果及预后很差,积极开展病因学研究及早期阻断卵巢癌的诱因很有必要。该文复习了近几年有关卵巢癌的病因流行病学文献,从环境、生殖、行为和遗传因素4个方面进行综述,发现卵巢癌的发生与以上诸多因素有关,早期预防甚为重要。

关键词：卵巢癌环境因素生殖因素行为因素遗传因素