检索结果-南通市图书馆

Simplified Technique for Predicting Offshore Pipeline Expansion

Journal of Marine Science and Application 2018年第1期17卷 68-78页

作者： J.H.Seo D.K.Kim H.S.Choi S.Y.Yu K.S.Park Graduate School of Engineering Mastership Pohang University of Science and TechnologyPohang 37673Republic of Korea Ocean and Ship Technology Research Group Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia Department of Civil and Environmental Engineering Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia Vietnam Construction steel Solution Marketing Center POSCO Vietnam HoldingsHo Chi Minh City 700000Vietnam

In this study,we propose a method for estimating the amount of expansion that occurs in subsea pipelines,which could be applied in the design of robust structures that transport oil and gas from offshore *** begin with a literature review and general discussion of existing estimation methods and terminologies with respect to subsea *** to the effects of high pressure and high temperature,the production of fluid from offshore wells is typically caused by physical deformation of subsea structures,e.g.,expansion and contraction during the transportation *** severe cases,vertical and lateral buckling occurs,which causes a significant negative impact on structural safety,and which is related to on-bottom stability,free-span,structural collapse,and many other *** addition,these factors may affect the production rate with respect to flow assurance,wax,and hydration,to name a *** this study,we developed a simple and efficient method for generating a reliable pipe expansion design in the early stage,which can lead to savings in both cost and computation *** such,in this paper,we propose an applicable diagram,which we call the standard dimensionless ratio(SDR)versus virtual anchor length(LA)diagram,that utilizes an efficient procedure for estimating subsea pipeline expansion based on applied reliable *** this user guideline,offshore pipeline structural designers can reliably determine the amount of subsea pipeline expansion and the obtained results will also be useful for the installation,design,and maintenance of the subsea pipeline.

关键词： Pipe expansion HP/HT Thermal expansion Subsea pipeline

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

Bonding Characteristics and Flexural Stiffening Effect of Carbon Fibre Reinforced Plastics Strand Sheets Bonded to steel Beams

引用

Journal of Civil Engineering and Architecture 2015年第2期9卷 207-212页

作者： Masatsugu Nagai Yuya Hidekuma Takeshi Miyashita Yusuke Okuyama Akiya Kudo Akira Kobayashi Department of Civil and Environmental Engineering Nagaoka University of Technology Niigata 940-2188 Japan Infrastructure Use Division Composites Company Nippon Steel & Sumikin Materials Co. Ltd Tokyo 103-0024 Japan Department of Civil Engineering National Institute of Technology Nagano College Nagano 381-8550 Japan West Tokyo Operation Bureau Metroportitan Expressway Co. Ltd Tokyo 102-0093 Japan

Corrosion of steel structures is unavoidable and the structural performance decreases dramatically due to the corrosion. As a repairing method for corroded steel members, bonding carbon fiber sheets with resin had been developed. The purpose of this study is to propose the flexural strengthening method for steel members by using CFRP （carbon fiber reinforced polymer） strand sheets. In order to clarify the stiffening effect and the debonding characteristics of CFRP strand sheets, and to optimize the strengthening design specifications, the flexural tests using high tension steel beams strengthened with CFRP strand sheets are performed. Two cases of experiments are carried out. In Experiment 1, the result from previous research is reflected in the strengthening design. Moreover in Experiment 2, the debonding characteristics obtained from Experiment 1 are reflected. As a result, it was clarified that CFRP strand sheets have stiffening effect equivalent to the theoretical value and its debonding property is practically high enough when FRP （fiber reinforcement polymer） sheets have an appropriate bonding length.

关键词： CFRP strand sheets corrosion debonding flexural strengthening steel members.

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

Spatial Analysis and Modelling of Wind Farm Site Suitability in Nasarawa State, North-Central Nigeria

引用

Journal of Geographic Information System 2021年第5期13卷 603-630页

作者： Chukwunonso Emmanuel Ozim Anita Odionyenfe Nweke Salamatu Abraham Ekpo Olufemi Stephen Oladeinde Haruna Kuje Ayuba Udochukwu Michael Mbanaso GIS Unit Enugu Electricity Distribution Company Enugu Enugu State Nigeria Federal Ministry of Mines and steel Development Abuja FCT Nigeria Department of Environmental Management Faculty of Environmental Science Nasarawa State University Keffi Nigeria National Space Research and Development Agency Obasanjo Space Centre Abuja FCT Nigeria Department of Urban and Regional Planning Faculty of Environmental Science Nasarawa State University Keffi Nigeria

There has been an increasing global and local interest in developing renewable, clean, and cheap energy towards achieving Goal number 7 of the Sustainable Development Goals (SDG). However, decisions involving suitable and sustainable locations for renewable energy projects remain an important task. This study employed Geographic Information System (GIS) and Multi-Criteria Decision Analysis (MCDA) to spatially analyze and model wind farm site suitability in Nasarawa State. The aim is to integrate the environmental, social, and economic aspects of decision-making for identifying sustainable wind farm sites. The study distinguished between two sets of decision criteria: decision constraints and decision factors. The former defined the exclusion zones while the latter were standardized based on fuzzy logic to depict varying degrees of suitability across the State. The MCDA applied the weighted linear combination method, with relative weights generated through pairwise comparisons of the analytic hierarchy process to analyze three policy scenarios: equal weights, environmental/social priority, and economic priority scenario. A combination of resulting composite maps from the constraints and the factors gave the final suitability maps. The resulting suitability index (SI) for the respective policy scenario describes the degrees of suitability: Ideal locations were denoted by one (1) and the not suitable locations by zero (0), with values in-between depicting varying degrees of wind farm site suitability. Based on the SI, priority locations indicating areas with good prospects, in addition to the most suitable parcels of land, were identified and delineated. The composite decision constraint revealed that wind farm projects would not be viable in more than half (57.58%) of the State. Wind speed was the major constraint and accounted for the exclusion of 46.25%, with a mean fuzzy membership value of 0.2008 indicating low suitability across the State. Also, the average accep

关键词： GIS Multi-Criteria Spatial Analysis and Modelling Wind Energy Farm Site Suitability Nasarawa State Nigeria

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

Influence of Tungsten and Cobalt Contents on the Microstructure Changes and Fracture Behavior of New Carbon-Free steel-alloy composites

引用

材料科学与工程（中英文B版） 2018年第5期8卷 181-187页

作者： W.S.Elghazaly O.Elkady steel Technology Dept. CMRDIPO Box 87HelwanCairoEgypt Manufacturing Sector CMRDICairoEgypt

The ever increasing demand for steel materials that have good combinations between strength and toughness urged all researchers working in the field of material science to find new alloys that can approach that *** strength and toughness of materials are always counter acting ***,carbon contents in the steel define to a great extent its strength and *** this research an effort is paid to produce steel alloy composites that can give higher strength together with good toughness without alloying with *** mechanism of strengthening in Iron-Cobalt-Tungsten composite alloys with variations in Co and W contents is *** fracture toughness and hardness,are measured for all alloy composites under *** changes in microstructures after heat treatment are emphasized using metallurgical microscopy and SEM-aided with EDX analyzing unit.

关键词： steel alloys precipitation hardening carbon-free alloys fracture toughness microstructure strengthening composite materials

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

Development of microalloyed steels for high temperature carburizing

引用

Baosteel Technical Research 2010年第S1期4卷 86-页

作者： David K MATLOCK John G SPEER Steven G JANSTO Marcos STUART Advanced steel Processing and Products Research Center Colorado School of Mines GoldenColorado USA CBMM-Reference Metals Bridgeville PA CBMM Sao Paulo Brasil

The potential for use of microalloy additions to suppress abnormal austenite grain growth and produce steels with enhanced bending fatigue resistance after high temperature vacuum carburizing was investigated in a series of Ti-modified SAE 8620 steels with w(niobium) additions up to 0.1%.Results are considered from a series of papers at the Advanced steel Processing and Products Research Center on the effects of Nb content,heating rate, rolling history,and processing temperature on the evolution of austenite grain structures in carburizing steels. Emphasis is placed on understanding the effects of alloying and processing on each stage in the annealing process including the as received laboratory rolled conditions,during the onset of carburizing after annealing at different heating rates,and after annealing for various times at carburizing temperatures up to 1 100℃.Heating rate to the carburizing temperature was shown to be an influential variable and suppression of abnormal grain growth was dependent on the development of a critical distribution of fine NbC precipitates,stable at the austenitizing *** importance to industrial carburizing practice of heating rate effects on precipitates and austenite grain size evolution are discussed and correlated to selected data on fatigue performance.

关键词： heat treating microalloying carburizing niobium abnormal grain growth

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

An Investigation on Controlling Sodium Content in NaxCoO2 Compound Synthesized Via Sol-Gel Route

引用

材料科学与工程（中英文版） 2010年第7期4卷 43-47页

作者： Ming Wang Lei Wang Jun He Sam Zhang Dongliang Zhao Department of Functional Material Research Central Iron and Steel Research Institute Beoing 100081 China School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore 639798 Singapore

The crystal structures and thermoelectric properties of NaxCoO2 compounds are very sensitive to the sodium content. This work focuses on the composition control of NaxCoO2. The metal (Na, Co)-citrate complex precursor was synthesized by a traditional sol-gel process. Characteristics of the pyrolysis reactions of the precursor were scanned by thermogravimetry and differential scanning calorimetry (TGA-DSC) analysis technique. The temperature dependence of the structure and composition of the pyrolysis compounds were carefully investigated by X-ray diffraction (XRD) and Inductively Coupled Plasma Atomic-Emission Spectrometry (ICP-AES). It was found that the formation and growth of NaxCoO2 initiated at about 823 K. Above this temperature, the volatilization of sodium accelerated and sodium content of the final product would be lower than the nominal one. The synthesis of NaxCoO2 was then optimized. The thermoelectric properties of the sintered sample were also probed. The above results indicate that the composition of NaxCoO2 can be effectively controlled by adjusting synthesis parameters.

关键词：溶胶凝胶法钠含量电感耦合等离子体原子发射光谱合成复合控制温度依赖性作者热电性能

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

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

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

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：