检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

美国阶级结构

1992年

作者：丹尼斯·吉尔伯特(dennis Gilbert) 约瑟夫 A.·卡尔(Jeseph A. Kahl)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

低成本气体发生器和点火器

火工情报 2003年第3期 138-145页

作者： HenryJ． dennis，Jri d．AndyHissam；W．NeillMyers；EricS，Taylor，U．S．

为火箭发动机涡轮泵的涡轮提供动力的气体发生器和点火器包括一个喷射器和一个燃烧室，喷射器有一个主体，它包括一个燃料进口和氧化剂进口，它们一个与另一个隔开一定距离而且在主体中与各自径向分开的环形部件相通。三个环形部件与燃... 详细信息

为火箭发动机涡轮泵的涡轮提供动力的气体发生器和点火器包括一个喷射器和一个燃烧室，喷射器有一个主体，它包括一个燃料进口和氧化剂进口，它们一个与另一个隔开一定距离而且在主体中与各自径向分开的环形部件相通。三个环形部件与燃料进口相通，而二个环形体与氧化剂入口相通。与氧化剂相通的环形体位于另一对环形体之间。主体用一个金属板封闭起来，金属板有一个排孔是按二个系列排列，在每个系列中是三个径向分开的环形排列组。外层系列的有28组三通孔，而内层系列有14组三通孔。该环形体与每组用氧化剂供料的孔相通，每组供氧化剂的孔是位于三通孔另二个孔之间。后面的孔与环形体相通，而环形体又与燃料相通。每组三通孔的内孔、外孔及第三个孔是相互倾斜的，以使燃料和氧化剂雾化。实际上它是喷入燃烧室的入口内，在这里，混合推进剂开始燃烧。推进剂的燃烧是通过一个固体推进剂燃料塞子(plug)的点火实现的，该塞子安装在与燃烧室相通的内部。

关键词：气体发生器点火器喷射器燃烧室

High affinity soluble ILT2 receptor:a potent inhibitor of Cd8^(+)T cell activation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protein & Cell 2010年第12期1卷 1118-1127页

作者： Ruth K.Moysey Yi Li Samantha J.Paston Emma E.Baston Malkit S.Sami Brian J.Cameron Jessie Gavarret Penio Todorov Annelise Vuidepot Steven M.dunn Nicholas J.Pumphrey Katherine J.Adams Fang Yuan Rebecca E.dennis deborah H.Sutton Andy d.Johnson Joanna E.Brewer Rebecca Ashfield Nikolai M.Lissin Bent K.Jakobsen Immunocore Limited 57c Milton ParkAbingdonOxonOX144RXUK Current address:Oxford Nanopore Technologies UK Current address:Geneva Merck Serono S.A. Switzerland Current address:Adaptimmune Limited UK

Using directed mutagenesis and phage display on a soluble fragment of the human immunoglobulin superfamily receptor ILT2(synonyms:LIR1,MIR7,Cd85j),we have selected a range of mutants with binding affinities enhanced by up to 168,000-fold towards the conserved region of major histocompatibility complex(MHC)class I *** in a dimeric form,either by chemical cross-linking with bivalent polyethylene glycol(PEG)derivatives or as a genetic fusion with human IgG Fc-fragment,the mutants exhibited a further increase in ligand-binding strength due to the avidity effect,with resident half-times(t1/2)on the surface of MHC I-positive cells of many *** novel compounds antagonized the interaction of Cd8 co-receptor with MHC I in vitro without affecting the peptide-specific binding of T-cell receptors(TCRs).In both cytokine-release assays and cell-killing experiments the engineered receptors inhibited the activation of Cd8^(+)cytotoxic T lymphocytes(CTLs)in the presence of their target cells,with subnanomolar potency and in a dose-dependent *** a selective inhibitor of Cd8^(+)CTL responses,the engineered high affinity ILT2 receptor presents a new tool for studying the activation mechanism of different subsets of CTLs and could have potential for the development of novel autoimmunity therapies.

关键词： Cd8^(+)T cells cellular activation autoimmunity cell surface molecules binding affinity phage display

维普期刊数据库

氮肥对禾草—三叶草混播草场的牧草组分、草冠结构、牧草生长的影响

在线全文

学校读者我要写书评

暂无评论

草学 1983年第1期 55-56页

作者： I.A.davidson M.J.Robson W.d.dennis 杜修贵四川省草原研究所

在混播草场中,三叶草相应于伴生禾草的特性,在季节内和季节间往往是变化莫测的,因此,要作出建立和保持已有草场组分的管理决定是困难的。所以,对混播草场各组分之间的相互作用,需要有在生理学基础上的更多的理解,其中一个重要的方面,就... 详细信息

在混播草场中,三叶草相应于伴生禾草的特性,在季节内和季节间往往是变化莫测的,因此,要作出建立和保持已有草场组分的管理决定是困难的。所以,对混播草场各组分之间的相互作用,需要有在生理学基础上的更多的理解,其中一个重要的方面,就是对阳光的竞争。三叶草表现性能低下,往往是由于禾草的荫蔽造成的,特别是在施大

关键词：三叶草禾草草场混播

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

阅读训练(9)(英文)

大学英语 2012年第6期 51-56页

作者： dennis Le Boeuf 景黎明

Passage 1 Maritime Explorer for the Crown of Castile It may be said, "In 1492 Columbus sailed the ocean blue, but he never knew what land he’d come to." Born in the Italian port of Genoa in 1451, Christopher Columbus... 详细信息

关键词：高校英语课外阅读阅读材料

维普期刊数据库

急性多发性皮层下小范围脑梗死是否由栓子机制导致?

在线全文

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（神经病学分册） 2005年第2期1卷 33-34页

作者： Chowdhury d. Wardlaw J.M. dennis M.S. 高中宝 department of Clinical Neurosciences Western General Hosp ital Crewe Road Edinburgh EH4 2XU United Kingdom

Objective: To seek evidence of potential embolic sources or other stroke mecha nisms in patients who, on chance observation, had several apparently recent smal l subcortical infarcts on diffusion weighted magnetic resonance imaging (dWI). M ethods: Patients presenting with stroke and multiple hyperintense subcortical in farcts visible on dWI were identified prospectively. detailed clinical and radio logical assessments were done independently and blinded to each other. Results: Of 10 patients with multiple hyperintense subcortical infarcts on dWI, a definit e embolic source was identified in only one. Most patients were hypertensive and smoked. The dWI appearance suggested that the subcortical lesions had occurred within several weeks rather than at exactly the same time. Most patients also ha d significant white matter hyperintensities and four had microhaemorrhages. Conc lusions: Embolic sources were not identified in most patients but they did have systemic vascular risk factors and brain imaging features of “small vessel dise ase.”A more generalised intrinsic process affecting many small cerebral vessels contemporaneously could explain multiple acute small subcortical infarcts. Whit e matter hyperintensities, microhaemorrhages, and multiple small subcortical inf arcts may share a common pathophysiological mechanism such as a diffuse cerebral microvascular abnormality which requires further exploration.

关键词：病理生理机制微出血小血管放射影像学盲法内源潜在来源血管病弥漫性

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

用3d技术探测轮胎胎坯结构

现代橡胶技术 2016年第2期42卷 38-45页

作者：赵冬梅 dennis Reynolds

本文介绍了用高速线性激光传感器的案例,即轮胎胎坯均匀性检测系统,将轮胎胎坯成型时各个阶段的表面几何形状数字化,并转化成可视图像,应用专业软件卡尺分析这些3d图像,评价所检测的部件定位、接头质量和尺寸偏差等特性参数。文中对检... 详细信息

本文介绍了用高速线性激光传感器的案例,即轮胎胎坯均匀性检测系统,将轮胎胎坯成型时各个阶段的表面几何形状数字化,并转化成可视图像,应用专业软件卡尺分析这些3d图像,评价所检测的部件定位、接头质量和尺寸偏差等特性参数。文中对检测胎坯的各项参数与硫化后轮胎均匀性的相关性进行了分析和探讨,同时,围绕这项测试技术与轮胎成型机的匹配问题以及这项技术测量特性参数的覆盖范围一并进行了讨论。

关键词：轮胎胎坯成型均匀性 3d技术

Patient-Specific QA of Spot-Scanning Proton Beams Using Radiochromic Film

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2017年第2期6卷 111-123页

作者： Maria F. Chan Chin-Cheng Chen Chengyu Shi Jingdong Li Xiaoli Tang Xiang Li dennis Mah dept. of Medical Physics Memorial Sloan Kettering Cancer Center New York NY USA dept. of Radiation Physics ProCure Proton Center Somerset NJ USA

Radiochromic film for spot-scanning QA provides high spatial resolution and efficiency gains from one-shot irradiation for multiple depths. However, calibration can be a tedious procedure which may limit widespread use. Moreover, since there may be an energy dependence, which manifests as a depth dependence, this may require additional measurements for each patient. We present a one-scan protocol to simplify the procedure. A calibration using an EBT3 film, exposed by a 6-level step-wedge plan on a Proteus®PLUS proton system (IBA, Belgium), was performed at depths of 18, 20, 24 cm using Plastic Water®(CIRS, Norfolk, VA). The calibration doses ranged from 65 - 250 cGy (RBE) (relative biological effectiveness) for proton energies of 170 - 200 MeV. A clinical prostate + nodes plan was used for validation. The planar doses at selected depths were measured with EBT3 films and analyzed using one-scan protocol (one-scan digitization of QA film and at least one film exposed to a known dose). The gamma passing rates, dose-difference maps, and profiles of 2d planar doses measured with EBT3 film and IBA MatriXX-PT, versus the RayStation TPS calculations were analyzed and compared. The EBT3 film measurement results matched well with the TPS calculation data with an average passing rate of ~95% for 2%/2 mm and slightly lower passing rates were obtained from an ion chamber array detector. We were able to demonstrate that the use of a proton step-wedge provided clinically acceptable results and minimized variations between film-scanner orientation, inter-scan, and scanning conditions. Furthermore, for relative dosimetry (calibration is not done at the time of experiment), it could be derived from no more than two films exposed to known doses (one could be zero) for rescaling the master calibration curve at each depth. The sensitivity of the calibration to depth variations has been explored. One-scan protocol results appear to be comparable to that of the ion chamber array d

关键词： Proton Therapy Patient-Specific QA Gaf Chromic EBT3 Film dosimetry

Application of a long short-term memory for deconvoluting conductance contributions at charged ferroelectric domain walls

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 319-325页

作者： Theodor S.Holstad Trygve M.Ræder donald M.Evans didirk R.Småbråten Stephan Krohns Jakob Schaab Zewu Yan Edith Bourret Antonius T.Jvan Helvoort Tor Grande Sverre M.Selbach Joshua C.Agar dennis Meier department of Materials Science and Engineering Norwegian University of Science and Technology(NTNU)7491 TrondheimNorway department of Materials Science and Engineering Lehigh UniversityBethlehemPA 18015USA Experimental Physics V Center for Electronic Correlations and MagnetismUniversity of Augsburg86159 AugsburgGermany department of Materials ETH Zurich8093 ZürichSwitzerland Materials Sciences division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA department of Physics ETH Zurich8093 ZürichSwitzerland department of Physics Norwegian University of Science and Technology(NTNU)7491 TrondheimNorway

Ferroelectric domain walls are promising quasi-2d structures that can be leveraged for miniaturization of electronics components and new mechanisms to control electronic signals at the *** the significant progress in experiment and theory,however,most investigations on ferroelectric domain walls are still on a fundamental level,and reliable characterization of emergent transport phenomena remains a challenging task.

关键词： walls ferroelectric conductance