检索结果-南通市图书馆

Rare Metals 2010年第5期29卷 480-485页

作者： LUO Jianjun P. de Rango d. Fruchart MEI Jinna HU Rui LI Jinshan ZHOU Lian state Key Laboratory of solidification Processing Northwestern Polytechnic University Xi'an 710072 China Matière Condensée Matériaux et Fonctions ( MCMF ) lnstitut Néel CNRS BP 166 38042 Grenoble Cedex 9 Francec Consortium de Recherches pour l'Emergence de Technologies Avancées ( CRETA ) CNRS BP 166 38042 Grenoble Cedex 9 France

Anisotropic powder was prepared with precursor （Nddy）-（FeCoNbCu）-B sintered magnets by hydrogen decrepitation, desorption, and subsequent annealing treatment. The hydrogen desorption was performed in magnetic fields of 0, 1, 3, and 5 T. The orientation of tetragonal phase grains of the powder was evaluated from the hysteresis loops measured by extraction magnetometer. Residual hydrogen content of the powder was evaluated by thermal-magnetic analysis. The powder with Hcj, Br, and （BH）max of 1138 kA.m^-1, 1.029 T, and 172.5 kJ.m^-3, respectively, was achieved under the condition of the magnetic field of 3 T. Magnetic properties of the powder, especially, the remanence of the powder, are enhanced upon magnetic fields, which is due to better orientation of powder particles and less residual hydrogen in the powder resulted from the magnetic field during the hydrogen desorption process.

关键词： permanent magnets hydrogen absorbing materials anisotropy magnetic measurements magnetic properties

新疆三塘湖地区中二叠世条湖组基性-超基性岩的地球化学特征及其大地构造背景

在线全文

学校读者我要写书评

暂无评论

中国科学：地球科学 2015年第11期45卷 1481-1496页

作者：汪双双柳益群张宏福周鼎武焦鑫南云中国地质调查局西安地质调查中心西安710054 西北大学地质学系大陆动力学国家重点实验室西安710069 山东科技大学地质科学与工程学院青岛266510

新疆东北部三塘湖地区是中亚造山带的重要组成部分,其二叠纪岩浆活动的动力学机制颇有争议.该区中二叠世条湖组出露一套厚层火山岩,以玄武岩为主,并有少量苦橄质岩、安山岩等.苦橄质岩具橄榄石的堆晶结构,其Mg#值高达0.68~0.77;玄武岩... 详细信息

新疆东北部三塘湖地区是中亚造山带的重要组成部分,其二叠纪岩浆活动的动力学机制颇有争议.该区中二叠世条湖组出露一套厚层火山岩,以玄武岩为主,并有少量苦橄质岩、安山岩等.苦橄质岩具橄榄石的堆晶结构,其Mg#值高达0.68~0.77;玄武岩具有斑状和粗玄结构,其Mg#值相对较低（0.41~0.54）,显示出演化的特征.条湖组基性-超基性岩具轻稀土略富集的右倾稀土配分模式,虽然在微量元素蛛网图上表现出Nb和Ti的负异常,但是总体具有较高的Ti O2含量,而且Nb,Zr含量以及Nb/Y,Zr/Yb比值远高于弧火山岩,较低的sr同位素初始比值和高正？Nd（t）和？Hf（t）值表明未受古老大陆地壳物质的混染,该区条湖组基性-超基性岩很可能是遭受俯冲流体交代,萃取而相对难熔的亏损岩石圈地幔部分熔融形成的.另外,苦橄质岩中橄榄石的堆晶高达38%,显示亏损岩石圈地幔部分熔融程度高,而条湖组下伏地层芦草沟组显示有深部地幔过碱性岩浆活动,表明三塘湖地区发生了大范围的高热地幔物质底垫作用,该过程可能与地幔柱作用有关.

关键词：中亚造山带三塘湖地区中二叠世苦橄质岩岩石圈地幔

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

π介子的非对称发射与核媒质态方程

高能物理与核物理 1993年第8期17卷 725-730页

作者：王山刘亦铭刘庆军 J.Jiang d.Keane Y.shao s.Y.Chu s.Y.Fung 哈尔滨工业大学理论物理教研室 department of Physics Kent State UniversityKentOhio 44242 department of Physics University of CarliforniaRiversideCa 92521

本文采用VUU模型研究了1.8AGeV Ar^+Pb碰撞中π介子非对称发射携带的核物质态方程信息。指出在靶核旁观者吸收较弱的入射核快度区域,末态π介子的集体运动中保留着同重子集体关联类似的特性,其发射方位角分布的非对称性是对核物质态方... 详细信息

本文采用VUU模型研究了1.8AGeV Ar^+Pb碰撞中π介子非对称发射携带的核物质态方程信息。指出在靶核旁观者吸收较弱的入射核快度区域,末态π介子的集体运动中保留着同重子集体关联类似的特性,其发射方位角分布的非对称性是对核物质态方程敏感的参量。由π介子方位角关联函数方法对Bevalac流光室1.8AGeV Ar^+Pb碰撞实验数据的分析结果和对硬核媒质态方程模型模拟事件的计算相符合。

关键词： π介子非对称发射核物质态方程

在线全文

学校读者我要写书评

暂无评论

情商培育塑造个人魅力

情商培育塑造个人魅力

Associations of Hydroxysteroid 17-beta dehydrogenase 13 Variants with Liver Histology in Chinese Patients with Metabolicassociated Fatty Liver disease

2003年

作者：（美）s.Michael Kravitz （美）susan d.schubert 韩经纶赵军译

本书以建设性的方式提出指导，教你学会怎样控制自己的情绪，提升情商水平。书中内容包括实用技巧、案例和练习。

关键词：情绪(学科: 智力商数学科: 研究) 情绪智力商数

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2021年第2期9卷 194-202页

作者： Wen-Yue Liu Mohammed Eslam Kenneth I.Zheng Hong-Lei Ma Rafael s.Rios Min-Zhi Lv Gang Li Liang-Jie Tang Pei-Wu Zhu Xiao-dong Wang Christopher d.Byrne Giovanni Targher Jacob George Ming-Hua Zheng department of Endocrinology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina storr Liver Centre Westmead Institute for Medical ResearchWestmead Hospital and University of SydneyWestmeadSydneyAustralia NAFLd Research Center Department of HepatologyThe First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina department of Biostatistics Zhongshan HospitalFudan UniversityShanghaiChina department of Laboratory Medicine The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina Institute of Hepatology Wenzhou Medical UniversityWenzhouZhejiangChina southampton National Institute for Health Research Biomedical Research Centre University Hospital SouthamptonSouthampton General HospitalSouthamptonUK section of Endocrinology Diabetes and MetabolismDepartment of MedicineUniversity and Azienda Ospedaliera Universitaria Integrata of VeronaVeronaItaly Key Laboratory of diagnosis and Treatment for The development of Chronic Liver disease in Zhejiang Province WenzhouZhejiangChina

Background and Aims:In Europeans,variants in the hydroxysteroid 17-beta dehydrogenase 13(Hsd17B13)gene impact liver histology in metabolic-associated fatty liver disease(MAFLd).The impact of these variants in ethnic Chinese is *** aim of this study was to investigate the potential associations in Chinese ***:In total,427 Han Chinese with biopsy-confirmed MAFLd were *** single nucleotide polymorphisms in Hsd17B13 were genotyped:rs72613567 and *** regression was used to test the association between the single nucleotide polymorphisms and liver ***:In our cohort,the minor allele TA of the rs72613567 variant was related to an increased risk of fibrosis[odds ratio(OR):2.93(1.20–7.17),p=0.019 for the additive model;OR:3.32(1.39–7.91),p=0.007 for the recessive model],representing an inverse association as compared to the results from European *** contrast,we observed a protective effect on fibrosis for the minor A allele carriers of the Hsd17B13 rs6531975 variant[OR:0.48(0.24–0.98),p=0.043 for the additive model;OR:0.62(0.40–0.94),p=0.025 for the dominant model].Hsd17B13 variants were only associated with fibrosis but no other histological ***,Hsd17B13 rs6531975 modulated the effect of PNPLA3 rs738409 on hepatic ***:Hsd17B13 rs72613567 is a risk variant for fibrosis in a Han Chinese MAFLd population but with a different direction for allelic association to that seen in *** data exemplify the need for studying diverse populations in genetic studies in order to fine map genome-wide association studies signals.

关键词： Metabolic-associated fatty liver disease(MAFLd) Nonalcoholic fatty liver disease(NAFLd) Hydroxysteroid 17-beta dehydrogenase 13(Hsd17B13) single nucleotide polymorphism(sNP)

Evaluation of carbon-based nanosorbents synthesised by ethylene decomposition on stainless steel substrates as potential sequestrating materials for nickel ions in aqueous solution

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 Environmental sciences 2012年第9期24卷 1559-1568页

作者： X.J.Lee L.Y.Lee L.P.Y.Foo d.G.Hassell department of Chemical and Environmental Engineering University of Nottingham Malaysia CampusJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia.

The present work covers the preparation of carbon-based nanosorbents by ethylene decomposition on stainless steel mesh without the use of external catalyst for the treatment of water containing nickel ions （Ni2＋）. The reaction temperature was varied from 650 to 850℃, while reaction time and ethylene to nitrogen flow ratio were maintained at 30 rain and 1：1 cma/min, respectively. Results show that nanosorbents synthesised at a reaction temperature of 650℃ had the smallest average diameter （75 nm）, largest BET surface area （68.95 m2/g） and least amount of impurity （0.98 wt.% Fe）. A series of batch sorption tests were performed to evaluate the effects of initial pH, initial metal concentration and contact time on Ni2~ removal by the nanosorbents. The equilibrium data fitted well to Freundlich isotherm. The kinetic data were best correlated to a pseudo second-order model indicating that the process was of chemisorption type. Further analysis by the Boyd kinetic model revealed that boundary layer diffusion was the controlling step. This primary study suggests that the prepared material with Freundiich constants compared well with those in the literature, is a promising sorbent for the sequestration of Ni2＋ in aqueous solutions.

关键词： adsorption nanosorbent nickel ions isotherms kinetics

Quantitative analysis of the impact of droughts and floods on internal wars in China over the last 500 years

在线全文

学校读者我要写书评

暂无评论

science China Earth sciences 2017年第12期60卷 2078-2088页

作者： Harry F.LEE david d.ZHANG PEI Qing JIA Xin Ricci P.H.YUE department of Geography and International Center for China development studies The University of Hong Kong school of Geographical sciences Guangzhou University department of social sciences The Education University of Hong Kong school of Geographic and Oceanographic sciences Nanjing University

Although many large-N quantitative studies have evidenced the adverse effects of climatic extremes on social stability in China during the historical period, most of them rely on temperature and precipitation as major explanatory variables, while the influence of floods and droughts on social crises is rarely measured. Furthermore, a comparison of the climate-society nexus among different geographic regions and at different temporal scales is missing in those studies. To address this knowledge gap,this study examines quantitatively the influence of floods and droughts on internal wars in three agro-ecological(rice, wheat,and pastoral) regions in China in Ad1470–1911. Poisson regression and wavelet transform coherence analyses are applied to allow for the non-linear and non-stationary nature of the climate-war nexus. Results show that floods and droughts are significant in driving internal wars in historical China, but are characterized by strong regional variation. In the rice region, floods trigger internal wars at the inter-annual and multi-decadal time scales. In the wheat region, both floods and droughts cause internal wars at the inter-annual and multi-decadal time scales. In the pastoral region, internal wars are associated with floods only at the multi-decadal time scale. In addition, the multi-decadal coherence between hydro-climatic extremes and internal wars in all three of the agro-ecological regions is only significant in periods in which population density is increasing or the upper limit of regional carrying capacity is being reached. The above results imply that the climate-war nexus is mediated by regional geographic factors such as physical environmental setting and population pressure. Hence, we encourage researchers who study the historical human-climate relationship to boil down data according to geographic regions in the course of statistical analysis and to examine each region individually in follow-up studies.

关键词： Floods and droughts Climatic extremes Internal wars Wars social stability Ming-Qing period

design and in vitro evaluation of controlled release alginate beads of diltiazem hydrochloride

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2009年第4期2卷 46-49页

作者： d.Nagasamy Venkatesh A.Kalaivani Kritika d.Kalro Lalitha Chintha James Tharani M.K.samanta B.suresh department of Pharmaceutics JSS College of PharmacyOOTY-643001Tamil NaduIndia

Objective:Oral slow and sustained release drug delivery system can release their drug content with a controlled manner,producing a desirable blood serum level,reduction in drug toxicity and improving the patient compliance by prolonging dosing *** major drawback of orally administered drug like diltiazem as a calcium channel blocker for the treatment of angina pectoris,arrhythmia and *** has higher aqueous solubility and shorter elimination ***:To overcome these drawbacks associated with diltiazem,an attempt has been made to develop a sustained release dosage form of diltiazem embedded alginate microbeads by ionotropic gelation technique employing various concentrations of polymer and keeping the drug concentration ***:The beads were characterized for its particle size,drug content and in vitro release studies. The results revealed that the surface adhering drug was found to release immediately and a steady state of release was obtained up to 12 h from all the *** results indicated there was an inverse relationship between the concentration of alginate and drug *** drug release was found to follow non-fickian diffusion obeying first order ***:The developed alginate microbeads offered a sustained release of diltiazem. Hence,the formulated microbeads were found to be potential,cost effective,possess satisfactory in vitro release studies.

关键词： sodium alginate diltiazem Microbeads Ionotropic gelation technique Peppa’s model

density functional study of elastic,mechanical and thermodynamic properties of MgCu with a CsCl-type structure

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 Magnesium and Alloys 2013年第2期1卷 128-133页

作者： s.Boucetta F.Zegrar Universite´sETIF 1 Laboratoire d’Elaboration de Nouveaux Mate´riaux et Caracte´risations(ENMC)De´partement de Physique19000 Se´tifAlgeria Universite´sETIF 1 Faculte´des sciencesDe´partement de Physique19000 Se´tifAlgeria

We have employed the density functional theory plane-wave pseudo potential method,with local density approximation and generalized gradient approximation to perform first-principles quantum mechanics calculations in order to investigate the structural,elastic and mechanical properties of the intermetallic compound MgCu with a CsCl-type *** calculated equilibrium lattice constant is in good agreement with the experimental and theoretical *** elastic constants were determined from a linear fit of the calculated stress-strain function according to Hooke’s *** the elastic constants,the bulk modulus B,anisotropy factor A,shear modulus G,Young’s modulus E,Poisson’s ratio y,and the ratio B/G for MgCu compound are *** calculated results for the bulk modulus B,and Young’s modulus E are consistent with the experimental and theoretical *** sound velocities and debye temperature are also predicted from elastic ***,the linear response method has been used to calculate the thermodynamic *** temperature dependence of the enthalpy H,free energy F,entropy s,and heat capacity at constant volume Cv of MgCu crystal in a quasi-harmonic approximation have been obtained from phonon density of states and discussed for the first report.

关键词： Intermetallics Mechanical properties Thermodynamic properties Computer simulations

玻璃纤维树脂增强压力容器的三心圆封头的强度和变形——环半径/圆筒直径比对于球半径与圆筒直径相等的封头之影响

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

国外固体火箭技术 1984年第4期 63-87页

作者： d.C.Barton P.d.soden s.s.Gill 廉茂林

我们做了6台带有三心圆封头的玻璃纤维树脂增强圆筒压力容器的破坏试验。各容器的标称厚度与直径之比为0.01,封头的球半径和圆筒的直径都是1米。环半径有三种尺寸,分别为0.29、0.19和0.1米,相对应的封头高度分别是0.32、0.25和0.19米(... 详细信息

我们做了6台带有三心圆封头的玻璃纤维树脂增强圆筒压力容器的破坏试验。各容器的标称厚度与直径之比为0.01,封头的球半径和圆筒的直径都是1米。环半径有三种尺寸,分别为0.29、0.19和0.1米,相对应的封头高度分别是0.32、0.25和0.19米(每种尺寸的容器各做了两台试验)。把试验结果同现行的英国国家设计标准(Bs4994)以及根据弹性应力分析运用计算机所求得的预测值(BOsOR4),进行了比较,完全证明了最大应力和应变是随环半径的减小而增加的。另外还发现:由于三心圆封头玻璃纤维树脂增强圆筒压力容器(GRP)的高弹应变,封头在压力作用下几何形状的变化对极限强度有很大的影响,再加上壁厚的局部增加,使得封头有所加强,以致在所试验的6台容器中,仅有3台的破坏发生在三心圆封头上。

关键词：压力容器封头三心圆玻璃纤维人造无机纤维树脂