检索结果-南通市图书馆

冠醚存在下氯代芳基化合物与碱金属氟化物的相互作用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

化工生产与技术 1994年第1期1卷 65-70页

作者： v.v.AKsENOv v.M.vLAsOv I.MMOrYAKINA P.P.rODIONOv v.P.FADEEvA v.s.CHErTOK G.G.YAKOBsOW 戴江 NOvOsIBrIsK有机化学研究所苏联630090

本文研究了各种冠醚对多氯芳烃与碱金属氟化物（KF，rbF，CsF）反应的影响。指出冠醚的催化作用跟多氯芳烃的性质几乎无关，且只有在一个确定的反应速率范围内才最有效。

关键词：冠醚氯化芳基碱金属氟化物相互作用

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

PC/ABs合金用磷酸酯阻燃剂应用进展

塑料助剂 2006年第2期 18-22页

作者：唐煌 sergei v.Levchik 美国旭瑞达有限公司上海代表处 supresta LLC 430 Saw Mill River Rd.ArdsleyNY10502

概述了国外用于PC/ABs合金的磷酸酯阻燃剂单磷酸酯、双磷酸酯和磷酸胺的现状与研究进展。近年来许多跨国公司在PC/ABs合金的阻燃剂上投入大量的研究工作。近期发表的关于PC/ABs合金阻燃剂的专利数目大大超过了任何一种聚合物阻燃剂的专... 详细信息

概述了国外用于PC/ABs合金的磷酸酯阻燃剂单磷酸酯、双磷酸酯和磷酸胺的现状与研究进展。近年来许多跨国公司在PC/ABs合金的阻燃剂上投入大量的研究工作。近期发表的关于PC/ABs合金阻燃剂的专利数目大大超过了任何一种聚合物阻燃剂的专利数量。由于聚碳酸酯是燃烧成炭率很高的聚合物,以固相作用为主的阻燃剂尤其是磷酸酯成为PC/ABs合金阻燃剂的最佳选择。

关键词：磷酸酯阻燃剂 PC/ABs合金

维普期刊数据库

Chronic hepatitis C virus infection:Prevalence of extrahepatic manifestations and association with cryoglobulinemia in Bulgarian patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第48期13卷 6518-6528页

作者： Diana v stefanova-Petrova Anelia H Tzvetanska Elisaveta J Naumova Anastasia P Mihailova Evgenii A Hadjiev rumiana P Dikova Mircho I vukov Konstantin G Tchernev Department of Internal Diseases and Gastroenterology University Hospital Alexandrovska viral Laboratory University Pediatric Hospital Central Laboratory of Immunology University Hospital Alexandrovska Department of Hematology University Hospital Alexandrovska Department of Pathology University Hospital Alexandrovka National Centre for Health Information

AIM: To assess the prevalence of extrahepatic manifestations in Bulgarian patients with chronic hepatitis C virus (HCv) infection and identify the clinical and biological manifestations associated with cryoglobulinemia. METHODs: The medical records of 136 chronically infected HCv patients were reviewed to assess the prevalence of extrahepatic manifestations. Association between cryoglobulin-positivity and other manifestations were identified using χ2 and Fisher’s exact test. risk factors for the presence of extrahepatic manifestations were assessed by logistic regression analysis. rEsULTs: seventy six percent (104/136) of the patients had at least one extrahepatic manifestation. Clinical manifestations included fatigue (59.6%), kidney impairment (25.0%), type 2 diabetes (22.8%), paresthesia (19.9%), arthralgia (18.4%), palpable purpura (17.6%), lymphadenopathy (16.2%), pulmonary fi brosis (15.4%), thyroid dysfunction (14.7%), raynaud’s phenomenon (11.8%), B-cell lymphoma (8.8%), sicca syndrome (6.6%), and lichen planus (5.9%). The biological manifestations included cryoglobulinproduction (37.5%), thrombocytopenia (31.6%), and autoantibodies: anti-nuclear (18.4%), anti-smooth muscle (16.9%), anti-neutrophil cytoplasm (13.2%) and anti-cardiolipin (8.8%). All extrahepatic manifestations showed an association with cryoglobulin-positivity, with the exception of thyroid dysfunction, sicca syndrome, and lichen planus. risks factors for the presence of extrahepatic manifestations (univariate analysis) were: age ≥ 60 years, female gender, virus transmission by blood transfusions, longstanding infection (≥ 20 years), and extensive liver fi brosis. The most signifi cant risks factors (multivariate analysis) were longstanding infection and extensive liver fi brosis. CONCLUsION: We observed a high prevalence of extrahepatic manifestations in patients with chronic HCv infection. Most of these manifestations were associated with impaired lymphoproliferation and cryoglobulin produc

关键词： Hepatitis C Liver cirrhosis Extrahepatic manifestations

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

确定儿童的正常主动脉直径

国际医学放射学杂志 2015年第3期 273-274页

作者： s.v.Hegde s.Y.Lensing s.B.Greenberg 陶志刚 Department of radiology Section of Pediatric Radiology Arkansas Children's Hospital University of Arkansas for Medical Sciences1 Children's WayLittle Rock AR 72202

目的通过对健康儿童(婴儿、儿童、青少年)及年轻的成年人(以下统称为"儿童")行多层次的胸主动脉、腹主动脉、髂总动脉直径大小系列CT数据采集分析,以建立有效

关键词：主动脉大动脉儿童髂总动脉

Analysis of Effect of solar radiation Pressure of Bigger Primary on the Evolution of Periodic Orbits

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Astronomy and Astrophysics 2016年第4期6卷 464-493页

作者： Niraj Pathak v. O. Thomas Department of Mathematics Dharmsinh Desai University Nadiad India Department of Mathematics The Maharaja Sayajirao University of Baroda Vadodara India

Evolution of periodic orbits in sun-Mars and sun-Earth systems are analyzed using Poincare surface of section technique and the effects of solar radiation pressure of bigger primary and actual oblateness of smaller primary on these orbits areconsidered. It is observed that solar radiation pressure of bigger primary has substantial effect on period, orbit’s shape, size and their position in the phase space. since these orbits can be used for the design of low energy transfer trajectories, so perturbations due to solar radiation pressure has to be understood and should be taken care of during trajectory design. It is also verified that stability of such orbits are negligible so they can be used as transfer orbit. For each pair of solar radiation pressure q and Jacobi constant C we get two separatrices where stability of island becomes zero. In this paper, detailed stability analysis of periodic orbit having two loops is given when q = 0.9845.

关键词： restricted Three Body Problem Low Energy Trajectory Design Periodic Orbits solar radiation Pressure Poincare surface of section

同性恋男子的树胶肿样阴茎溃疡及泛发性淋巴结病——病例报告

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

北京医学 1990年第5期 286-286页

作者： v s KITCHEN

本文报告1例43岁的德国男性,因16个月无痛性阴茎溃疡和近期出现的梅毒血清学检查阳性[TPHA及FTA-ABs均(+)、vDrL滴度1:1024]而就诊,患者无梅毒史,8年前有过同性恋史。患者颈部、腋

关键词：淋巴结病阴茎溃疡树胶肿树胶样肿泛发性

儿童和青春期淋巴瘤:以PET/CT增强为标准的全身sTIr半傅里叶rArE Mr成像对疾病早期分期的研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2010年第3期 283-284页

作者：刘双 s. Punwani s.A. Taylor A. Bainbridg v. Prakash s. Bandula Department of specialist radiology University College London Hospital

摘要目的对照PET/CT的增强诊断标准,探讨全身快速Mr成像对儿童及青春期淋巴瘤早期分期的诊断价值。材料与方法本研究

关键词：淋巴瘤内型 rArE Mr PET/CT sTIr 儿童 CT 全身傅里叶

A high-throughput data analysis and materials discovery tool for strongly correlated materials

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2018年第1期4卷 138-146页

作者： Hasnain Hafiz Adnan Ibne Khair Hongchul Choi Abdullah Mueen Arun Bansil stephan Eidenbenz John Wills Jian-Xin Zhu Alexander v.Balatsky Towfiq Ahmed Department of Physics Northeastern UniversityBostonMA 02119USA Department of Computer science University of New MexicoAlbuquerqueNM 87131USA Theoretical Division Los Alamos National LaboratoryLos AlamosNM 87545USA The Information science and Technology Institute Los Alamos National LaboratoryLos AlamosNM 87545USA Nordita KTH Royal Institute of Technology and Stockholm UniversityRoslagstullsbacken 23Stockholm SE-10691Sweden Department of Physics University of ConnecticutStorrsCT 06269USA Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Modeling of f-electron systems is challenging due to the complex interplay of the effects of spin–orbit coupling,electron–electron interactions,and the hybridization of the localized f-electrons with itinerant conduction *** complexity drives not only the richness of electronic properties but also makes these materials suitable for diverse technological *** this context,we propose and implement a data-driven approach to aid the materials discovery *** deploying state-of-the-art algorithms and query tools,we train our learning models using a large,simulated dataset based on existing actinide and lanthanide *** machine-learned models so obtained can then be used to search for new classes of stable materials with desired electronic and physical *** discuss the basic structure of our f-electron database,and our approach towards cleaning and correcting the structure data *** examples of the applications of our database include successful prediction of stable superstructures of double perovskites and identification of a number of physically-relevant trends in strongly correlated features of f-electron based materials.

关键词： database desired conduction

Characterization of cooling rate and microstructure of Cu sn melt droplet in drop on demand process

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

Transactions of Nonferrous Metals society of China 2017年第7期27卷 1636-1644页

作者： Yi XU N. ELLENDT Xing-gang LI v. UHLENWINKEL U. FrITsCHING school of Materials science and Engineering Southwest Jiaotong University Chengdu 610031 China Foundation Institute of Materials science Bremen University Bremen 28359 Germany

Different sized single droplets of Cu-6%sn alloy were prepared by drop on demand(DOD)*** secondarydendrite arm spacing was measured and correlated with the droplet cooling rate by a semi-empirical *** microstructure ofdroplets was observed by optical microscopy(OM)and electro backscatter diffraction(EBsD).The dendrite feature of singledroplets depends on solidification rate,cooling medium and flight *** droplets collide with each other at temperaturesbetween solidus and liquidus,the dendrites and grains are refined obviously possibly because the collision enhances the heat *** cooling rate of colliding droplets is estimated to be more than4×104K/s based on a Newton’s cooling *** dendritesgrow along the colliding direction because of the temperature gradient induced by the internal flow inside the droplets.

关键词： impinging droplet secondary dendrite arm spacing cooling rate heat transfer drop on demand

维普期刊数据库