检索结果-南通市图书馆

Experimental Investigation on the Performance of Armour grade Q&t Steel Joints Fabricated by Flux Cored Arc Welding with Low Hydrogen Ferritic Consumables

引用

Journal of Materials Science & technology 2009年第5期25卷 583-591页

作者： g.Magudeeswaran V.Balasubramanian g.Madhusudhan Reddy g.gopalakrishnan Metal Joining Research Center(MJRC) Sri Ramakrishna Engineering CollegeN.G.G.O Colony-Post Centre for Materials Joining&Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai University Scientist-F Metal Joining SectionDefence Metallurgical Research Laboratory(DMRL)Kanchanbagh(P.O)

Quenched and tempered （Q＆t） steels are widely used in the construction of military vehicles due to its high strength to weight ratio and high hardness. these steels are prone to hydrogen induced cracking （HIC） and softening in the heat affected zone （HAZ） after welding. the use of austenitic stainless steel （ASS） consumables to weld the above steel was the only available remedy to avoid HIC because of higher solubility for hydrogen in austenitic phase. Recent studies revealed that low hydrogen ferritic （LHF） steel consumables can also be used to weld Q＆t steels, which can give very low hydrogen levels in the weld deposits and required resistance against cold cracking. Hence, in this investigation an attempt has been made to study the performance of armour grade Q＆t steel joints fabricated by flux cored arc welding with LHF steel consumables. two different consumables namely （i） austenitic stainless steel and （ii） low hydrogen ferritic steel have been used to fabricate the joints by flux cored arc welding （FCAW） process. the joints fabricated by LHF consumable exhibited superior transverse tensile properties due to the presence of ferrite microstructure in weld metal. the joints fabricated by ASS consumable showed higher impact toughness due to the presence of austenitic phase in weld metal microstructure. the HAZ softening in coarse grain heat affected zone （CgHAZ） is less in the joints fabricated using LHF consumable due to the lower heat input involved during fabrication compared to the joints fabricated using ASS consumables.

关键词： Quenched and tempered steel Flux cored arc welding process Low hydrogen ferritic steel tensile 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

Life cycle inventory for base metal ingots production in Japan including mining and mineral processing processes by cost estimating system database

引用

中国有色金属学会会刊：英文版 2007年第A01期17卷 131-135页

作者： t.ADACHI g.MOgI Department of Materials and Environmental Science Institute of Industrial ScienceThe University of TokyoKomabaMeguro-KuTokyo 153-8505Japan Department of technology Management for Innovation The University of TokyoHongoBunkyo-Ku Tokyo 113-8656Japan

CO2 emission levels of copper and zinc mines from which Japanese smelters import ore concentrates into Japan,were estimated by using a database called MLED. Eleven copper mines selected from data availability of mine site covered 84% of the total imported concentrates. Adding inventories of sea transportation and smelting processes to mine development process,total CO2 emission level for copper and zinc ingots produced in Japan were calculated. the results show that the emission share of mining and mineral processing processes for each mine is indicated around 30%-70% of total emission for ingots,which implies the importance of including the mining activities to the inventory of upper stream products.

关键词：金属材料铸造方法矿物二氧化碳

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

Prediction of abnormal pressure from AVO velocities over“Safety”field,onshore Niger delta,Nigeria

引用

Petroleum Research 2021年第1期6卷 26-41页

作者： O.Abiola t.g.Ayenuro Department of Applied geophysics Federal University of TechnologyAkureNigeria

Abnormal pressure prediction was undertaken in“Safety”field,onshore Niger Delta,Nigeria using amplitude variation with offset(AVO)velocities *** of the methods used form an integral part of a process that produces AVO Analysis,AVO velocity inversion,extraction of seismic velocity from AVO velocities inversion results and pore pressure *** pressure predicted from the seismic velocity has a better resolution than the pressure predicted from the interval transit *** pore pressure within the field ranges from 14.7psi to *** and underpressured zones were delineated on the field from the pressure predicted from the seismic *** the field,the overpressured zones were delineated at depth 6855 fte7802 *** pressure top was delineated at a depth of 6855 ft with a pore pressure of 3053psi and a corresponding hydrostatic pressure of *** under-pressured zones were also delineated at depth 7883 fte9288 *** under pressure top was delineated at a depth of 7883 ft with a pressure of 1093psi and a corresponding hydrostatic pressure of *** values within the over pressure zone ranges from 23%to 53%which could be considered as relatively *** could be as a result of the fact that the pore fluid cannot be expelled rapidly thereby causing the pore fluid to increase rapidly since they are no longer compacted;thus leading to *** a result of overpressure top which is directly above the reservoir top within the shale zone,drilling this reservoir vertically could not be suggested so as to avoid possible blow *** was also observed that the primary cause or mechanism of overpressure within this field could be disequilibrium compaction.

关键词： Abnormal pressure Amplitude variation with offset Velocities information Pore pressure Disequilibrium compaction

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

genetic variation for seed phosphorus and yield traits in Indian sorghum landraces and varieties

引用

the Crop Journal 2015年第4期3卷 358-365页

作者： Ashok Badigannavar g.girish t.R.ganapathi Nuclear Agriculture and Biotechnology Division Bhabha Atomic Research Centre (BARC) Agricultural Research Station

Phytic acid is the major storage form of phosphorus in cereals. It binds with nutritionally important metals and affects mineral bioavailability. the present study analyzed phytic acid, inorganic phosphorus(IP) content, seed weight, and grain yield in 98 sorghum landraces and varieties grown in two environments to evaluate genotypic and environmental effects and to determine trait stability. genotypic effects and genotype × interaction were significant for phytic acid concentration and yield components. A promising landrace, Malkhed-1, had the lowest phytic acid(0.015 mg g-1)concentration, with a higher yield(70.02 g plant-1), than the check variety M-35-1 in both environments. Similarly, among the varieties, Phule Maulee showed the lowest phytic acid(0.07 mg g-1) and a higher grain yield of 53.15 g plant-1in both environments. Phytic acid and IP were negatively correlated(r =- 0.34), whereas grain yield and seed weight were positively correlated(r = 0.20). Cluster analysis based on seed phosphorus traits and yield components identified five and six clusters, respectively. genotypes containing low phytic acid with high yield identified in this study would be helpful for increasing the bioavailability of mineral nutrients.

关键词： Phytic acid Sorghum genetic variability Correlation

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

Progress toward Steady-State Operation on tore Supra

引用

Plasma Science and technology 2004年第1期6卷 2101-2108页

作者： J.Jacquinot g.t.Hoang on behalf of the tore Supra team Euratom-CEA Association CEA/DSM/DRFC CEA Cadarache F-13108 Saint-Paul-Lez-Durance FranceEuratom-CEA Association CEA/DSM/DRFC CEA Cadarache F-13108 Saint-Paul-Lez-Durance FranceEuratom-CEA Association CEA/DSM/DRFC CEA Cadarache F-13108 Saint-Paul-Lez-Durance France

Important technological and physics issues related to steady-state operationrequired for next step are being examined on tore Supra, after a major upgrade of internalcomponents in order to increase the heat extraction capability to 25 MW for 1000 s. Here, we showfirst experimental results, where all the plasma facing components were actively cooled duringpulses exceeding four minutes, with reactor-relevant heat load. New physics was observed innon-inductively driven plasmas, including a stationary peaked radial profile of the plasma densitygenerated by an anomalous inward pinch; and a regime characterized by sinusoidal oscillations ofcentral electron temperature, governed by non-linear coupling between heat transport and plasmacurrent analogous to a predator-prey mechanism.

关键词： steady-state operation tore supra, non-inductively driven plasma

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

Magnetoelectric Coupling in Bilayers of Pb（Zr, ti）O3 Epoxy and Hot Pressed Manganite Perovskite

引用

Chinese Physics Letters 2006年第2期23卷 463-466页

作者：张宁印晓明王淼 Schneider t. Srinivasan g. Department of Physics Nanjing Normal University Nanjing 210097 Department of Physics Oakland University Rochester MI 48309 USA

the synthesis and magnetoclectric （ME） characterization of bilayers of Pb（Zr, ti）O3 （PZt） and hot pressed manganite perovskite La0.7Sr0.3MnO3 （LSMO） are discussed. Very strong ME interactions are measured for the bilayers. the bilayers exhibit superior ME coupling compared to thick-film composites prepared by tape casting process. Data of the ME voltage coefficient have been obtained as functions of bias magnetic field H, temperature and frequency. the transverse coupling is stronger than the longitudinal interactions and a maximum in the ME voltage coefficient is measured at 225K. the frequency dependence of the ME voltage coefficient reveals a peak at the electromechanical resonance due to radial modes.

关键词： LAMINAtE COMPOSItES

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

EIS Study on Pitting Corrosion of AA5083-H321 Aluminum-Magnesium Alloy in Stagnant 3.5% NaCl Solution

引用

Journal of Materials Science & technology 2008年第2期24卷 215-219页

作者： K.Jafarzadeh t.Shahrabi M.g.Hosseini Corrosion Lab. Materials Eng.Dept.Tarbiat Modares Univ.TehranIran Dept.of Physical Chemistry Facul-ty of ChemistryTabriz Univ.TabrizIran

In this research, EIS （electrochemical impedance spectroscopy） technique was utilized to study the pitting corrosion behaviour of AA5083-H321 aluminum-magnesium alloy in 3.5% NaCl solution. Impedance spectra were obtained during 240 h of exposure of the sample to the test solution. the surface and cross-section of the samples were studied by scanning electron microscopy （SEM） and EDAX （energy dispersive analysis of X-ray） analysis. the results indicated that as the resistance of the passive layer on intermetallic particles is very small, this parameter on the sample surface layers is controlled by that of pure passive layer. However, the capacitors in the proposed equivalent circuit are replaced with the constant phase elements （CPE）, due to non-uniformity and occurrence of pitting corrosion on the surface. the outward diffusion of Al^＋3 ions through the passive layer and the thickening of this layer cause the impedance decrease in the first 24 h and increase afterwards. the detachment of intermetallic particles from some of pits and the accumulation of the corrosion products inside some others are factors that prevents the continuation of cathodic reactions on the top of the intermetallic particles.

关键词： Corrosion AA5083-H321 aluminum-magnesium alloy Impedance Pitting Intermetallic particle Passive layer

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

Energy System Selection for Small Underwater Vehicles

引用

Journal of thermal Science 1994年第1期3卷 7-14页

作者： g.t.Reader J.g.Hawley 等 DepartmentofMechanicalEngineering UniversityofCalgaryCalgaryAlbertaCanada RoyalNavalEngineeringCol

the oceans cover almost three-quarters of the earth's surface and provide a highway for commerceor conquest and constitute a rich source of nutrients, materials and energy. the exploration and exploitation of oceanic resources accelerated in the 1970s because of the emerging offshore oil and gasindustry. the extraction and national protection of these and other resources will increase rapidlyin the next century and in support of these activities one of the most useful tools will be the smallunderwater vehicle. However, if these vehicles are to carry out the envisaged tasks in a cost--effectiveand mission-effective manner they will require high performance energy systems. A number of suchsystems are being developed and the problem arises as which one to select for a particular task. In thispaper the development of software based techniques for the selection of energy systems is described.

关键词： energy system selection small underwater vehicles

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

Reliability analysis of earth dams using direct coupling

引用

Journal of Rock Mechanics and geotechnical Engineering 2020年第2期12卷 366-380页

作者： A.t.Siacara g.F.Napa-garcía A.t.Beck M.M.Futai Department of civil engineering university of sao paulosao paulobrazil Research group geoinfrausp university of sao paulosao paulobrazil Instituto tecnológico vale ouro pretominas geraisbrazil

Numerical methods are helpful for understanding the behaviors of geotechnical ***,the computational cost sometimes may become prohibitive when structural reliability analysis is performed,due to repetitive calls to the deterministic *** this paper,we show how accurate and efficient reliability analyses of geotechnical installations can be performed by directly coupling geotechnical software with a reliability *** earth dam is used as the study object under different operating *** limit equilibrium method of Morgenstern-Price is used to calculate factors of safety and find the critical slip *** conmercial software packages Seep/W and Slope/W are coupled with StRAnD structural reliability *** indices of critical probabilistic surfaces are evaluated by the first-and second-order structural reliability methods(FORM and SORM),as well as by importance sampling Monte Carlo(ISMC)*** means of sensitivity analysis,the effective friction angle(φ′)is found to be the most relevant uncertain geotechnical parameter for dam *** correlations between different geotechnical properties are shown to be relevant in terms of equilibrium reliability ***,it is shown herein that a critical slip surface,identified in terms of the minimum factor of safety(FS),is not the critical surface in terms of the reliability index.

关键词： Earth dam geotechnical parameters Reliability analysis Water level

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

APPROXIMAtION BY KANtOROVICH-BERNStEIN POLYNOMIALS IN L_p(0tRIC

引用

Analysis in theory and Applications 1992年第3期8卷 38-50页

作者： g.t.tachev Institute of Mathematics Bulgarian Academy of Sciences P.O.Box 373 1090 SofiaBulgaria

the purpose of the present paper is to evaluate the error of the approximation of the func- tion fL_1[0,1]by Kantorovich-Bernstein polynomials in L_p-metric(0

关键词： MEtRIC p<1 APPROXIMAtION BY KANtOROVICH-BERNStEIN POLYNOMIALS IN L_p

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：