检索结果-南通市图书馆

Corrosion and passive behaviour of duplex stainless steel 2205 at different cooling rates in a simulated marine-environment solution

引用

Journal of Iron and Steel Research International 2018年第9期25卷 943-953页

作者： Shang-lin Lv Zhong-min Yang bin Zhang Jie Chen Ying Chen xiao-bin li National Construction Steel Quality Supervision and Test Centre Central Research Institute of Building and Construction Co. Ltd. Beijing 100088 China Department of Structural Steels Central Iron and Steel Research Institute Beijing 100081 China China University of Pertroleum-Beijing Beijing 102249China

The corrosion and passive behaviour of duplex stainless steel 2205 at six cooling rates （1, 5, 10, 15, 20 ℃ s^-1 and water quenched） in a simulated marine-environment solution was investigated using electrochemical measurements of potentiostatic critical pitting temperature, potentiodynamic polarisation curves, electrochemical impedance spectroscopy and Mott-Schottky curves. The microstructural evolution and pitting morphologies of the specimens were visualised using an optical microscope and scanning electron microscope. The electrochemical responses of the passive film show that passivity of the steel was enhanced as the cooling rate increased; however, the threshold cooling rate was 20 ℃ s^-1, beyond which pitting corrosion resistance remained stable. Based on the analyses of microstructural evolution and pit morphologies, the proportion of the ferrite phase increased with the cooling rate and the ratio of austenite and ferrite was close to 1：1. The pitting size decreased as the cooling rate increased, and most metastable pits on specimens were located in the ferrite phase and on the ferrite-austenite interface. Thus, pitting resistance of steel is governed by the phase that provides the lowest pitting resistance equivalent number. The optimised pitting corrosion resistance for steel 2205 was achieved when it was greater than or equal to 20℃ s^-1.

关键词： Duplex stainless steel Cooling rate Pitting corrosion Passive film Electrochemistry

来源：

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

Anorectal Malignant Melanoma：Diagnosis and Treatment of 42 Cases

引用

Chinese Journal of Cancer Research 2010年第3期22卷 176-180页

作者： xiao-bin li lin Shi Shuang-min Zhang Department of General Surgery Peking Union Medical College Hospital Peking UnionMedical College Chinese Academy of Medical Sciences Beijing 100730 China Department of General Surgery Haidian Hospital Beijing 100080 China

Objective：Anorectal malignant melanoma（AMM） is a rare and aggressive malignant tumor,and its treatment still *** study was to investigate and summarize our experience on diagnosis,treatment and misdiagnosis of ***：From August 1980 to December 2009,42 patients with AMM were treated in our *** clinical data of those patients were retrospectively analyzed,including the major symptoms,treatment and *** immunophenotyping analyses using antibodies to S-100 protein,HMB-45 reactive antigen and vimentin were performed in 22 ***：The major complaints among the 42 cases were hematochezia（23/42,55.0%）,anal masses（12/42,28.6%）,changes in stool character（4/42,9.5%）,and anal tenesmus or pain（3/42,7.1%）.The misdiagnosis rate was 62%（26/42）,the most common misdiagnosis consisted of hemorrhoid（9/26,34.6%）,polyps（11/26,42.3%） and rectal cancer（6/26,23.1%）.28 cases underwent abdominoperineal resection,10 underwent local wide excision,3 underwent palliative operation,and 1 with no *** surgery,15 patients underwent radiotherapy,21 underwent chemotherapy and 8 were treated with both.22 cases deceased within 1 year,11 within 2 years,5 within 3 years and 1 within 4 *** median survival time was 11 months,with the longest of 45 *** immunohistochemical findings revealed that the S-100 protein was present in all 22 cases（100%）,HMB-45 was stained in 19 of 22（86.4%） and vimentin in 21 of 22（95.5%）.Conclusion：AMM is a rare disease with a poor prognosis and with an aptitude of being *** is the most common *** staining is conducive to the diagnosis of *** is the major treatment,the operation type should be individualized.

关键词： Anorectal Melanoma Diagnosis Treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A New Gluing Recursive Relation for linear Sigma Model of P^1-orbifold

引用

Acta Mathematica Sinica,English Series 2013年第9期29卷 1757-1772页

作者： xiao bin li Bo Hui CHEN Cheng Yong DU Department of Mathematics Sichuan University Chengdu 610064 P. R. China Department of Mathematics Southwestern Jiaotong University Department of Mathematics and Yangtze Mathematical Center Sichuan University Department of Mathematics Sichuan University

The study of the moduli space plays an important role in classical enumerative geometry and its interaction with string theory in physics. Given X=[P1/Zr] and let x＇ = （[0]a , [∞]b） the 2-tuple of twisted sectors on X , we construct in this paper two different compactifications of the moduli space M0,2（X, d[P1/Zr], x＇）： Nonlinear Sigma Model Mx＇d and linear Sigma Model Nx＇d . Relations between Mx＇d and Nx＇d are studied and a new gluing recursive relation on Nx＇d is derived from Mx＇d due to virtual localization formula.

关键词： Orbifold Gromov–Witten invariant nonlinear (linear) Sigma model orbi-gluing recursive relation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Formation of internal cracks during soft reduction in rectangular bloom continuous casting

引用

International Journal of Minerals,Metallurgy and Materials 2012年第1期19卷 21-29页

作者： xiao-bin li Hua Ding Zheng-you Tang Ji-cheng He School of Materials and Metallurgy Northeastern University Shenyang 110819 China The Key Laboratory of the Ministry of Education for Electromagnetic Processing of Materials Northeastern University Shenyang 110819 China

To investigate the formation of internal cracks in GCrl 5 bearing steels during the soft reduction process in rectangular bloom con- tinuous casting, fully coupled thermomechanieal finite element models were developed using the commercial software ***, and microstructures and fractographs were also observed. With the finite element models, the contours of temperature, equivalent plastic strain, and equivalent vun Mises stress were simulated. It is observed that the fracture surfaces of internal cracks are covered by cleavage or quasi-cleavage facets. The region of internal cracks in the intergranular brittle fracture mode is in the mushy zone between the zero ductility temperature （ZDT） and the zero strength temperature （ZST）. The simulated equivalent plastic strain in the crack region is 2.34%-2.45%, which is larger than the critical strain （0.4%-1.5%）, and the equivalent von Mises stress is 1.84-5.05 MPa, which is within the range of criti- cal stress （3.9-7.2 MPa）, thus resulting in the occurrence of internal cracks. Reducing the soft reduction amount from 3 to 2 mm can lower the stress under the critical value.

关键词： bearing steel rectangular blooms soft reduction finite element method internal cracks

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A classification matching method for manufacturing resource in cloud manufacturing environment

引用

International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 264-274页

作者： Wei-Jiao Feng Chao Yin xiao-bin li liang li State Key Laboratory of Mechanical Transmission Chongqing University 174 Shazhengjie Shapingba400044ChongqingP.R.China School of Economics and Business Administration Chongqing University 174 Shazhengjie Shapingba400044ChongqingP.R.China Chongqing HITECH Information-Based Manufacturing Productivity Promotion Center Co.Ltd 210 Hanyu Road Shapingba400040ChongqingP.R.China

Cloud manufacturing(CMfg),combining the idea and technologies of cloud computing and Internet of Things,is an emerging service-oriented manufacturing *** supply–demand matching of manufacturing resources is one of the key technologies for ***,resources in CMfg system are geographically distributed,functional of similar and dynamically changeable,and these features make it difficult to obtain higher accuracy for existing matching *** order to select the most satisfied resources in CMfg,a semantics-based supply–demand classification matching method(SDCM)is ***,the implementing framework of SDCM is con***,combined with the theories of ontology and dynamic description logic,a semantics-based SDCM algorithm is designed,which includes four implementation stages,respectively,basic information matching,IOPE parameters(Input,Outputs,Preconditions,Effects)matching,QoS(Quality of Service)matching and comprehensive ***,a case verifies the feasibility and effectiveness of the proposed method.

关键词： Cloud manufacturing manufacturing resource supply-demand matching ontology.

来源：

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

Surface properties of superfine alumina trihydrate after surface modification with stearic acid

引用

International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 537-542页

作者： Gui-hua liu Bo-hao Zhou Yun-feng li Tian-gui Qi xiao-bin li School of Metallurgy and Environment Central South University

The surface properties of superfine alumina trihydrate （ATH） after surface modification were studied by measuring the contact angle, active ratio, oil adsorption, total organic carbon, adsorption ratio, and Fourier transform infrared （FTIR） spectrum. The contact angle increased initially and then slowly decreased with an increase of the amount of stearic acid. However, the surface flee energy decreased ini- tially and then increased. Surface modification with stearic acid or sodium stearate can benefit from elevating temperature. The base surface tension component and the free energy of Lewis acid-base both declined sharply following the surface modification. Excess stearic acid was physically adsorbed in the form of multilayer adsorption, and an interaction between oxygen on the ATH surface and hydroxyl in stearic acid was subsequently determined. Our results further indicated that the contact angle and adsorption ratio can be used as control indicators for surface modification compared with active ratio, oil adsorption and total organic carbon.

关键词： alumina trihydrate surface modification stearic acid surface flee energy surface tension contact angle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed

引用

International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 954-963页

作者： Gui-hua liu Zheng li xiao-bin li Tian-gui Qi Zhi-hong Peng Qiu-sheng Zhou School of Metallurgy and Environment Central South University

The precipitation of spherical boehmite was studied by surface energy calculations, measurements of precipitation ratios, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The surface energy calculation results show that the(001) and(112) planes of gibbsite surfaces are remarkably stable because of their low surface energies. In addition, the(010) plane of boehmite grows preferentially during precipitation because of its low surface energy. Thus, we propose a method to precipitate spherical boehmite from a supersaturated sodium aluminate solution by adding gibbsite as seed in a heterogeneous system. In this method, gibbsite acts as the preliminary seed and saturation modifier. The results show that the fine boehmite first nucleates on the(001) and(112) planes of gibbsite and then grows vertically on the(001) and(112) basal planes of gibbsite via self-assembly, thereby forming spherical boehmite. Simultaneously, gibbsite is dissolved into the aluminate solution to maintain the saturation for the precipitation of boehmite. The precipitation ratio fluctuates(forming an M-shaped curve) because of gibbsite dissolution and boehmite precipitation. The mechanism of boehmite precipitation was further discussed on the basis of the differences in surface energy and solubility between gibbsite and boehmite. This study provides an environmentally friendly and economical method to prepare specific boehmite in a heterogeneous system.

关键词： precipitation sodium aluminate solution morphology boehmite gibbsite surface energy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Searching for Variable Stars in and around Open Clusters

引用

Chinese Journal of Astronomy and Astrophysics 2002年第6期2卷 481-486页

作者： Yu Xin, xiao-bin Zhang and li-Cai DengNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We present a snapshot-of our recent results of a variable star survey in 1 degree fields around three open clusters: NGC 188, NGC 7789 and M67. A total number of 39 variable stars are newly discovered, including 22 W ... 详细信息

关键词： open clusters : individual : NGC 188, NGC 7789 and M67 stars : variables

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radiation protection in the design of λ-ray industrial computed tomography systems

引用

Nuclear Science and Techniques 2016年第4期27卷 174-180页

作者： Ri-Feng Zhou xiao-Jian Zhou xiao-bin li Ping li The Key Laboratory for Opto-electronic Technology and Systems of Ministry of Education ICT Research Center University of Chongqing Chongqing 400044 China Nuclear and Radiation Safe Center Ministry of Environmental Protection of People's Republic of China Beijing 100082 China Environmental Protection Agency of Chongqing Chongqing 401147 China

The recent increasing use of γ-rays industrial computed tomography(γ-rays ICT) in various fields has induced greater attention to its performance as well as to considerations of radiation safety. It is understood that radiation protection planning cannot be sacrificed for the sake of CT image quality during the design, manufacture,and layout of γ-rays ICT systems. In the present work, we describe a typical γ-rays ICT system in brief, and, based on experience and pertinent examples, we propose design requirements for ensuring the radiation safety of the sealed radioactive source, source container, and workspace. The design examples and dose rate measurement results illustrate that the proposed design standards are reasonable,feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems. This paper discussed the predominant measures associated with the radiation protection of γ-rays ICT systems in accordance with the pertinent Chinese standards. In addition, based on experience and pertinent examples, the design requirements for ensuring the radiation safety of a sealed radioactive source, source container, and workspace were defined in detail. The design examples and dose rate measurements conducted in conjunction with a γ-rays ICT system and workspace employing the proposed design standards have illustrated that the proposals provided in this paper are reasonable, feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems.

关键词：工业CT系统设计实例辐射防护密封放射源评估测定设计标准 γ射线

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation and electrochromism of pyrochlore-type tungsten oxide film

引用

Rare Metals 2018年第7期37卷 604-612页

作者： Qiu-Sheng Zhou Yong-Kun Chen xiao-bin li Tian-Gui Qi Zhi-Hong Peng Gui-Hua liu School of Metallurgy and Environment Central South University

Pyrochlore-type WO3 powder was synthesized via hydrothermal method using aqueous sodium tungstate solution and oxalic acid as raw materials. The as-prepared powder was made into a soliquoid, from which films were made by dip coating process with indium-tin oxide （ITO）. The obtained films were characterized by thermogravimetric and differential thermal analysis （TG-DTA）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, cyclic voltammetry （CV）, chronoamperometry （CA） and ultraviolet- visible （UV-Vis） absorption. Results show that the crystal of the pyrochlore-type WO3 powder is perfect. When the calcination temperature rises from room temperature to 500℃, the pyrochlore-type structure first becomes deformed, then it is destroyed and turns into amorphous phase, finally it will completely convert to WO3 with a monoclinic structure. Electrochemical and optical tests demonstrate that the film calcined at 300℃ exhibits the best electrochromic performance and has a coloration efficiency of up to 68.5 cm^2-C^-1 at 884 nm.

关键词： Pyrochlore-type WO3 Sodium tungstatesolution Films Electrochromic properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：