检索结果-南通市图书馆

维普期刊数据库博看期刊

同方期刊数据库

Some recent advances in 3D crack and contact analysis of elastic solids with transverse isotropy and multifield coupling

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2015年第5期31卷 601-626页

作者： wei-qiu Chen Department of Engineering Mechanics Zhejiang University

Significant progress has been made in mixed boundary-value problems associated with three-dimensional（3D） crack and contact analyses of advanced materials featuring more complexities compared to the conventional isotropic elastic *** include material anisotropy and multifield coupling,two typical characteristics of most current multifunctional *** this paper we try to present a state-of-the-art description of 3D exact/analytical solutions derived for crack and contact problems of elastic solids with both transverse isotropy and multifield coupling in the latest decade by the potential theory method in the spirit of *** ingenious breakthrough brings new vigor and vitality to the old research subject of classical potential *** are particularly interested in crack and contact problems with certain nonlinear *** is also placed on the coupling between the temperature field（or the like） and other physical fields（e.g.,elastic,electric,and magnetic fields）.We further highlight the practical significance of 3D contact solutions,in particular in applications related to modern scanning probe microscopes.

关键词： Crack Contact Mixed boundary-value problem Transverse isotropy Multifield coupling Potential theory Exact solution Scanning probe microscope

Effects of the properties of FCCS on the removing of catalyst particles from FCCS under a DC electrostatic field

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第3期20卷 1885-1894页

作者： Qiang Li Qing-zhu qiu Hao Cao Hui-Zhen Yang wei-wei Xu Zhao-Zeng Liu College of New Energy China University of Petroleum(East China)QingdaoShandong 266580China

Catalytic cracking is the main method to lighten heavy crude oil,this process can produce high quality oil products such as gasoline and diesel,but also produces a large amount of fluid catalytic cracking slurry(FCCS).The catalyst particles in FCCS seriously restrict the secondary processing of FCCS and need to be removed,and the properties of Fccs is an important factor that affects the removal efficiency of the catalyst *** on the"effective contact point"model proposed by the research group,this study further proposed the"electrostatic separation efficiency calculation"*** this model,since Fccs has a uniform distribution of catalyst particles,the ratio of the number of catalyst particles can be expressed as the ratio of area to achieve the calculation of separation *** the catalyst removal efficiency under different viscosity was analyzed,thus verifying the feasibility of this *** effects of temperature and mass ratio of four components on the viscosity of FccS were investigated respectively,then the effects of temperature and four components'mass ratio on the electrostatic sep-aration can be directly converted into the effect of viscosity on the electrostatic separation *** the results show the electrostatic separation efficiency decreases with increasing viscosity,and the best separationtemperatureis120℃.

关键词： Fluid catalytic cracking slurry(FCCS) Separation efficiency Viscosity Temperature Four components'mass ratio

Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO_(4)/C Cathode Materials for Improved Performance and Favorable Thermostability

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 790-800页

作者： wei Yang Xiulian qiu Chengyun Wang Jinhao Ye Jihua zhu Hanbo Zou Shengzhou Chen School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou510006China GAC Automotive Research and Development Center Guangzhou511434China Sunwoda Electronics Co. LtdShenzhen518107China

An environmentally friendly method for the synthesis of LiMnPO_(4)/C anode material for lithium-ion batteries by solvothermal method is *** modification of the morphology of this precursor is altered by changing the ratio of the conditioning solvent(water-ethylene glycol solution)and the order of material *** glycol(EG)exerts a considerable influence on synthesizing LiMnPO_(4)/C flake-like nanocrystal,which benefits the extraction/insertion reaction of lithium ions and improves the electrochemical activity and electrochemical performance of LiMnPO_(4)/C *** the solvent composition is H_(2)O:EG=1:3,exhibiting exceptional charge/discharge performance and rate capability,the specific discharge capacities are 155.8,153.7,148.8,141.4,129.5,and 112.6 mAh g^(−1) at the 0.1,0.2,0.5,1,2,and 5 C rates,*** the charge-discharge rate returns to 0.1 C,the LiMnPO_(4)/C material shows a reversible discharge specific capacity of 153.7 mAh g^(−1).Differential scanning calorimetry(DSC)tests verify that the thermodynamic stability of the prepared LiMnPO_(4)/C(LMP)and commercial LiFePO_(4)(LFP)materials is better than that of commercial nickel-cobalt-aluminum(NCA)ternary *** prepared LiMnPO_(4)/C composites have high electrochemical capacity and cycle stability.

关键词： LiMnPO_(4)/C solvothermal method Ethylene glycol Lithium-ion diffusion Thermostability

不同透析频率对维持性血液透析患者感染的影响

在线全文

学校读者我要写书评

暂无评论

中国医师进修杂志 2010年第22期33卷 29-31页

作者：程立新徐玉芝祝维秋郭玉强山东省聊城市第二人民医院肾内科 252600

目的研究不同透析频率对维持性血液透析患者感染、转归的影响。方法根据透析频率将53例慢性肾衰竭维持性血液透析患者分为三组：A组19例，每周透析3次；B组15例，每周透析2次；C组19例，每2周透析3次。记录透析1年内三组感染发生情况及... 详细信息

目的研究不同透析频率对维持性血液透析患者感染、转归的影响。方法根据透析频率将53例慢性肾衰竭维持性血液透析患者分为三组：A组19例，每周透析3次；B组15例，每周透析2次；C组19例，每2周透析3次。记录透析1年内三组感染发生情况及死亡例数。结果三组共发生感染62例次，A组17例次，B组18例次，C组27例次；感染部位依次为肺部35例次（56．45％）、血管通路14例次（22．58％）、尿路8例次（12．90％）和消化道5例次（8．06％）。三组共死亡8例，病死率15．09％（8/53）。A组死亡1例，B组死亡1例，C组死亡6例。三组预后比较差异有统计学意义（χ2=6．293，P〈0．05）。结论透析频率低于2次／周的患者感染发生率高，病死率也高。应调整透析方案，增加透析频率。

关键词：肾透析死亡率透析频率感染

护理干预对行长期深静脉留置导管维持性血液透析患者心理状况的影响

在线全文

学校读者我要写书评

暂无评论

中国当代医药 2014年第24期21卷 177-179页

作者：祝维秋史玉占徐亚光庄丽华山东省聊城市第二人民医院血液透析室山东临清252600

目的探讨护理干预对行长期深静脉留置管维持性血液透析患者心理状况的影响。方法选择在本院行长期深静脉留置管的维持性血液透析患者共40例,随机分为观察组和对照组,采用Zung抑郁自评量表和Zung焦虑自评量表进行问卷调查和评定,比较护... 详细信息

目的探讨护理干预对行长期深静脉留置管维持性血液透析患者心理状况的影响。方法选择在本院行长期深静脉留置管的维持性血液透析患者共40例,随机分为观察组和对照组,采用Zung抑郁自评量表和Zung焦虑自评量表进行问卷调查和评定,比较护理干预前后心理状况变化。结果行长期深静脉留置管的维持性血液透析患者焦虑、抑郁心态的影响因素中,与性别、教育程度无关(P>0.05),与年龄、透析时间及透析费用支持能力有关(P<0.05);护理干预后,观察组SDS评分及SAS评分均较对照组明显下降,差异有统计学意义(P<0.05)。结论对长期深静脉留置管维持性血液透析患者采取个体化的护理干预,可以减少患者焦虑、抑郁等心理状况的发生率,提高生存质量。

关键词：护理干预尿毒症血液透析心理状况

Ricci-Bourguignon Flow on Manifolds with Boundary

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2021年第6期42卷 953-968页

作者： Hongbing qiu Anqiang zhu School of Mathematics and Statistics Wuhan UniversityWuhan 430072China Hubei Key Laboratory of Computational Science Wuhan UniversityWuhan430072China Corresponding author.School of Mathematics and Statistics Wuhan UniversityWuhan 430072China

The authors consider the short time existence for Ricci-Bourguignon flow on manifolds with *** the initial metric has constant mean curvature and satisfies some compatibility conditions,they show the short time existe... 详细信息

关键词： Ricci-Bourguignon flow Boundary value problem

在线全文

学校读者我要写书评

暂无评论

胰岛素瘤的定位与外科治疗

天津医科大学学报 2001年第3期7卷 385-387页

作者：田伟军王鹏志朱理玮邱宇杰天津医科大学总医院普通外科 300052

目的 :评价胰岛素瘤影像学定位价值和外科治疗方式。方法 :对1995年5月～2000年10月外科治疗的26例胰岛素瘤进行回顾分析。结果 :BUS术前定位准确率23.1 %、CT定位准确率55 %、DSA定位准确率50 %,手术探查准确率96.2%。行肿瘤剜除术21... 详细信息

目的 :评价胰岛素瘤影像学定位价值和外科治疗方式。方法 :对1995年5月～2000年10月外科治疗的26例胰岛素瘤进行回顾分析。结果 :BUS术前定位准确率23.1 %、CT定位准确率55 %、DSA定位准确率50 %,手术探查准确率96.2%。行肿瘤剜除术21例 ,切除肿瘤21枚 ,行胰体尾部及脾切除4例 ,切除肿瘤7枚 ,其中1例为多发胰岛素瘤伴胰岛细胞增生 ,胰岛素瘤多达4枚 ,恶性胰岛素瘤伴肝转移1例。结论 :胰岛素瘤影像学术前定位率很低。

关键词：胰岛素瘤定位诊断外科手术治疗

Construction of CoNi_(2)S_(4) nanocubes interlinked by few-layer Ti_(3)C_(2)T_(x) MXene with high performance for asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第12期41卷 4116-4126页

作者： Ji-qiu Qi Meng-Yuan Huang Chen-Ya Ruan Dong-Dong zhu Lei zhu Fu-Xiang wei Yan-wei Sui Qing-Kun Meng Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments School of Materials Science and PhysicsChina University of Mining and TechnologyXuzhou 221116China Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000China

Both MXene and zeolitic imidazolate framework(ZIF)derivatives are tend to agglomerate during the compound process,which adversely affects their electrochemical *** alleviate this phenomenon,fewlayer MXene was stripped by mechanical method,and electrostatic self-assembly with ZIF-67 in the presence of cationic ***,CoNi_(2)S_(4)/MXene composite was synthesized by the facile hydrothermal ***_(2)S_(4)well retained the cube frame structure of the ZIF-67 with the sagging outer frame and rough *** the composite,CoNi_(2)S_(4)nanocubes were interlinked by MXene nanosheets,which can effectively improve the structural stability and make full use of the active ***_(2)S_(4)/MXene composite electrode exhibits an outperforming specific capacitance(751 C·g^(-1)at 1 A·g^(-1)),far higher than that of pure CoNi2S4(600 C·g^(-1)at 1 A·g^(-1)).An asymmetric supercapacitor(CoNi_(2)S_(4)/MXene//reduced graphene oxide(RGO))assembling delivers high energy density of 33.8 Wh·kg^(-1)and excellent cycling *** study indicates the potential of MXene/ZIF derivatives in the application of supercapacitor.

关键词： Cubic frame structure Few-layer MXene ZIF-67 Asymmetric supercapacitor

Fatigue characteristics and microcosmic mechanism of Al-Si-Mg alloys under multiaxial proportional loadings

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 437-443页

作者： Xiao-song Jiang Guo-qiu He Bing Liu Zheng-yu zhu wei-hua Zhang School of Material Science and Engineering Tongji University Shanghai 200092 China National Power Traction Key Laboratory Southwest Jiaotong University Chengdu 610031 China

With the increasing use of Al-Si-Mg alloys in the automotive industry,the fatigue performance of Al-Si-Mg alloy has become a major concern with regard to their *** fatigue characteristics and microcosmic mechanism of an Al-Si-Mg alloy under multiaxial proportional loadings were investigated in this *** low cycle fatigue life and material strengthening behavior are closely related,the effect of equivalent strain amplitude on the multiaxial fatigue properties was *** tests were conducted to determine the influence of equivalent strain amplitude on the multiaxial proportional fatigue *** fatigue life exhibits a stable behavior under multiaxial proportional *** dislocation structures of the Al-Si-Mg alloy were observed by transmission electron microscopy（TEM）.The dislocation structure evolution of the Al-Si-Mg alloy under multiaxial proportional loadings during low cycle fatigue develops step by step by increasing fatigue ***,the dislocation structure changes with the change in equivalent strain amplitude under multiaxial proportional *** experimental evidence indicates that the multiaxial fatigue behavior and life are strongly dependent on the microstructure of the material,which is caused by multiaxial proportional loadings.

关键词： aluminum alloys proportional loadings fatigue microstructure