检索结果-南通市图书馆

General heat balance for oxygen steelmaking

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2021年第5期28卷 538-551页

作者： N.Madhavan G.A. Brooks M.A. Rhamdhani B.k. Rout A. Overbosch Department of Mechanical and Product Design Engineering Swinburne University of TechnologyHawthorn 3122VICAustralia Tata Steel Ijmuiden 1951 JZThe Netherlands

Energy balances are a general fundamental approach for analyzing the heat requirements for metallurgical *** formulation of heat balance equations was involved by computing the various components of heat going in and coming out of the oxygen steelmaking *** developed model was validated against the calculations of Healy and *** overall heat losses that have not been analyzed in previous studies were quantified by back-calculating heat loss from 35 industrial data provided by Tata *** results from the model infer that the heat losses range from 1.3%to 5.9%of the total heat input and it can be controlled by optimizing the silicon in hot metal,the amount of scrap added and the postcombustion *** model prediction shows that sensible heat available from the hot metal accounts for around 66%of total heat input and the rest from the exothermic oxidation *** of 34%of the heat from exothermic reactions,between 20%and 25%of heat is evolved from the oxidation of carbon to carbon monoxide and carbon *** model can be applied to predict the heat balance of any top blown oxygen steelmaking technology but needs further validation for a range of oxygen steelmaking operations and conditions.

关键词： Heat balance Static model Process control Optimization Basic oxygen steelmaking Heat loss

Handbook of Computational Methods for Integration

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

Thixocasting combination spanners using stainless steel X39CrMo17

2005年

作者： kythe Prem k.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2010年第S3期20卷 998-1004页

作者： M.BüNCk E.SUBASIC A.BüHRIG-POLACZEk k.JIANG S.MüNSTERMANN J.M.SCHNEIDER k.FICkERT H.J.GüNTHER Foundry Institute at RWTH Aachen University AachenGermany Materials Chemistry at RWTH Aachen University AachenGermany HAZET-Hermann Zerver GmbH & Co.kG RemscheidGermany PlaTeG GmbH SiegenGermany

Forging is state-of-the-art for producing hand tools on an industrial *** to high demands on the stiffness and the fracture toughness,high-strength forging steels were used to provide cavity-free components with high mechanical load ***,forging is a cost-effective mass production process but,in spite of all its advantages,it has its limitations,*** the freedom of ***,because of the extreme thermal loading(particularly with regard to permanent moulds) and the frequently unavoidable casting defects,hand tools are not *** means of thixocasting steel,technical difficulties can be reduced and new options are provided which allow the manufacturing of components with much higher complexity than that using *** near-net shape production,manufacturing steps and costs can be ***,steels,which are difficult to forge but nonetheless have high potential for specific applications(such as high strength or corrosion resistant steels),can also be *** cooperation with industrial partners,X39CrMo17 stainless steel combination spanners with 17 mm width across flats were *** dies were designed and optimized by simulation,the hot forming X38CrMoV5 tool steel as well as the molybdenum alloy TZM were selected as the tool *** dies were treated by a plasma nitriding process and subsequently coated with crystalline Al2O3 protective coatings by plasma-enhanced chemical vapor deposition(PECVD).During the experiments,combination spanners were successfully cast in the semi-solid *** parts were heat-treated to enhance the toughness of components,which was subsequently measured by a standardized torque ***,a hypothetical approach of a possible,industrial batch process was carried out using the simulation software MAGMAsoft.

关键词： thixocasting X39CrMo17 steel casting semi-solid MAGMAsoft simulation

Mr Chack Sang Wong (1930-1993) Architect,Hong kong

在线全文

学校读者我要写书评

暂无评论

世界建筑 1995年第1期 14-16页

作者： k. C Lye

Mr C S Wong started his practice in 1957 as Wong Ng Associates with a staff of10 which in 1959 became Wong Ng Ouyang & *** this early periodthey had only six or seven small buildings to their *** would indicate thatall of them struggled,contrary to various myths I have heard on how they *** 1964 onwards,the practice *** & Ouyang(Hk)Ltd formedin 1972 and Ng,that is Ng Chun Mun stafted his own practice-the rest is *** the practice has about 300 staff.

关键词： than more Architect,Hong kong Mr Chack Sang Wong

On Copositive Approximation in Spaces of Continuous Functions Ⅱ:The Uniqueness of Best Copositive Approximation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2016年第1期32卷 20-26页

作者： Aref k. kamal Department of Mathematics and Statistics S. Q. University P.O. Box 36 AI Khoudh123 Muscat Sultanate of Oman

This paper is part II of ＂On Copositive Approximation in Spaces of Contin- uous Functions＂. In this paper, the author shows that if Q is any compact subset of real numbers, and M is any finite dimensional strict Chebyshev subspace of C （Q）, then for any admissible function f ∈ C（Q）／M, the best copositive approximation to f from M is unique.

关键词： Strict Chebyshev spaces best copositive approximation change of sign.

A CLASS OF TESTS USING L STATISTIC FOR CONSTANT RELATIVE FAILURE RATE AGAINST MONOTONE RELATIVE FAILURE RATE

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1992年第1期5卷 19-26页

作者： k.W.Chen University of North Carolina Charlotte NC 28223USA

In this paper we develop tests using L-statistic for constant relativefailure rate against monotone relative failure *** invariance,monotonepower and locally asymptotic power results are *** examples arepresented.

关键词： Relative failure rate L-statistic scale invariance monotone power asymptotic power Pitman efficacy

A Review of Density Holes Upstream of Earth＇s Bow Shock

在线全文

学校读者我要写书评

暂无评论

空间科学学报 2011年第6期31卷 693-704页

作者： G k Parks E Lee N Lin J B Cao S Y Fu J k Shi Space Sciences Laboratory University of California Berkeley USA kyung Hee University Suwon Korea School of Astronautics Beihang University Beijing 100191 Institute for Space Physics Peking University Beijing 100871 State key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190

Larmor size transient structures with density depletions as large as 99%of ambient solar wind density levels occur commonly upstream of Earth’s collisionless bow *** "density holes" have a mean duration of 17.9±10.4s but holes as short as 4 s have been *** average fractional density depletion（δn/n） inside the holes is 0.68±*** density of the upstream edge moving in the sunward direction can be enhanced by five or more times the solar wind density. Particle distributions show the steepened edge can behave like a shock,and measured local field geometries and Mach number support this *** shaped magnetic holes accompany the density holes indicating strong coupling between fields and *** densities as large as 150nA·m-2 are observed at the leading compressed *** waves are elliptically polarized and rotating in the sense of ions（left hand） in the plasma *** waves appear to grow and steepen as the density holes convect with the solar wind toward the *** transient nature of density holes suggests that the temporal features could represent the different stages of nonlinear evolutionary processes that produce a shock-like *** density holes are only observed with upstream particles,suggesting that back-streaming particles interacting with the solar wind are important. The significance of these observations is still being investigated.

关键词：大密度上游地球激波审查平均时间几何形状大电流密度

On p-Valent Functions With Negative And Missing Coefficients

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 1990年第2期 249-256页

作者： M.k.AOUF Dept. of Math. Faculty of Science Univ. of Qatar

Let P（A, B, p, α） be the class of functions f（z）=z-sum from n=k+1 to ∞|a|z,k≥p≥1,analytic and p-valent in the unit disc and satisfying where -1≤B-p for the class P（A, B, p, α）. Conversely when F（z）P（A, ... 详细信息

关键词： show 一曰 On p-Valent Functions With Negative And Missing Coefficients

Phyllofenone A, a New Scalarane Sesterterpene from the Sponge Phyllospongia Foliascens(Pallas)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1991年第2期7卷 100-106页

作者： John k. Snyder Department of Chemistry Boston University Boston USAhe present paper covers the structure of a new sesterterpene phyllofenone A(1) isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes with a (C-20 C-24)-bishomo-(C-25)-nortetra-cyclic skeleton. The structure charcterization was based on one- and two-dimensional NMR and mass spectroscopy with the assistance of molecular modeling. Phyllofenone A shows weak antifungal activity against Candida pseudotropicalis.

The present paper covers the structure of a new sesterterpene, phyllofenone A(1) , isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes with a (C-20, C-24)-bishomo-(C-25)-nortetra-cyclic skeleton. The structure charcterization was based on one- and two-dimensional NMR and mass spectroscopy with the assistance of molecular modeling. Phyllofenone A shows weak antifungal activity against Candida pseudotropicalis.

关键词： Sponge Sesterterpene Selective INEPT 2D NMR