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SLAG IN THE PROCESS OF ESR:EXECUTIVE PART AND URGENT TASKS

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SLAG IN THE PROCESS OF ESR:EXECUTIVE PART AND URGENT TASKS

Ninth International Conference on Molten Slags,Fluxes and Salts(MOLTEN12)

作者： medovar lev Stovpchenko Ganna Lisova Lyudmyla E.O.Paton Electric Welding Institute Kyiv03150Ukraine

Solving the new tasks of increasing the purity and quality of the ESR ingots the creation of effective slag composition has been *** demands to the slag and urgent tasks of its improving were *** were given some resul... 详细信息

关键词： slag electroslag process chemistry physical properties hollow ingot

来源： cnki会议评论

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第二代液态电渣冶金技术的发展

钢铁研究学报 2013年第3期25卷 1-7页

作者：姜周华 lev medovar Ganna Stovpchenko 董艳伍臧喜民刘福斌东北大学材料与冶金学院辽宁沈阳110819 乌克兰巴顿电焊研究所乌克兰基辅03150

描述了基于导电结晶器的第二代液态电渣冶金技术的原理、特点和应用情况,主要包括液态电渣浇注实心锭、空心锭和复合轧辊。同时,介绍了采用液态电渣浇注技术制备双金属耐腐蚀钢筋和铜钢复合电极的试验结果。最后,对今后的发展提出了展望... 详细信息

描述了基于导电结晶器的第二代液态电渣冶金技术的原理、特点和应用情况,主要包括液态电渣浇注实心锭、空心锭和复合轧辊。同时,介绍了采用液态电渣浇注技术制备双金属耐腐蚀钢筋和铜钢复合电极的试验结果。最后,对今后的发展提出了展望,指出液态电渣浇注技术与连铸工艺的结合将是今后的发展趋势,并提出了液态电渣多次多层复合法制备特大型钢锭的可行性。

关键词：电渣冶金导电结晶器液态金属浇注发展

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空心管坯电渣重熔技术

材料与冶金学报 2011年第B03期10卷 81-85页

作者：臧喜民姜周华 lev medovar 姜海龙东北大学材料与冶金学院沈阳110004 乌克兰巴顿电焊研究所东北大学材料先进制备技术工程研究中心沈阳110004

在分析了几种大口径厚壁管的生产方法后,发现电渣重熔管坯技术可解决其他方法生产大口径厚壁管生产过程中存在的成本高、铸件质量低的问题.通过对电渣重熔管坯技术的原理及几项关键技术的分析,证实电渣重熔管坯技术是可行的,并且具有广... 详细信息

在分析了几种大口径厚壁管的生产方法后,发现电渣重熔管坯技术可解决其他方法生产大口径厚壁管生产过程中存在的成本高、铸件质量低的问题.通过对电渣重熔管坯技术的原理及几项关键技术的分析,证实电渣重熔管坯技术是可行的,并且具有广泛的应用前景和经济价值.

关键词：电渣重熔厚壁管 T形结晶器结晶器导电漏渣

Factorizations of Finite Groups and Related Topics

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Algebra Colloquium 2020年第1期27卷 149-180页

作者： lev Kazarin Department of Mathematics Yaroslavl State UniversityRussia

This is a survey on the recent progress in the theory of finite groups with factorizations and around it,done by the author and his coauthors,and this has no pretensions to cover all topics in this wide area of *** particular,we only touch the great consequences of the fundamental paper of Liebeck,Praeger and Saxl on maximal factorizations of almost simple finite groups for the theory of groups with *** each case the reader can find additional references at the end of Section *** of the methods of investigation can be used to obtain information about finite groups in general,nilpotent algebras and related nearrings.

关键词： finite groups products of groups conjugacy classes Sylow subgroups Lie type groups factorizations

A search for evidence of small-scale inhomogeneities in dense cores from line profile analysis

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Research in Astronomy and Astrophysics 2018年第8期18卷 97-102页

作者： lev Pirogov Institute of Applied Physics Russian Academy of Sciences

In order to search for intensity fluctuations on the HCN（1-0） and HCO＋（1-0） line pro- files, which could arise due to possible small-scale inhomogeneous structure, long-term observations of high-mass star-forming cores S140 and S199 were carried out. The data were processed by the Fourier filtering method. Line temperature fluctuations that exceed the noise level were detected. Assuming the cores consist of a large number of randomly moving small thermal fragments, the total number of frag- ments is - 4 × 106 for the region with linear size - 0.1 pc in S140 and - 106 for the region with linear size - 0.3 pc in S 199. Physical parameters of fragments in S 140 were obtained from detailed modeling of the HCN emission in the framework of the clumpy cloud model.

关键词： lines profiles - molecular data - methods data analysis - ISM clouds - ISM molecules - ISM structure - ISM individual objects (S 140)

Multi-gene genetic programming extension of AASHTO M-E for design oflow-volume concrete pavements

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Journal of Road Engineering 2022年第3期2卷 252-266页

作者： Haoran Li lev Khazanovich Department of Civil and Environmental Engineering University of PittsburghPittsburghPA 15261USA

The American Association of State Highway and Transportation Officials Mechanistic-Empirical Pavement DesignGuide (AASHTO M-E) offers an opportunity to design more economical and sustainable high-volume rigid pavementscompared to conventional design guidelines. It is achieved through optimizing pavement structural andthickness design under specified climate and traffic conditions using advanced M-E principles, thereby minimizingeconomic costs and environmental impact. However, the implementation of AASHTO M-E design for low-volumeconcrete pavements using AASHTOWare Pavement ME Design (Pavement ME) software is often overly *** is because Pavement ME specifies the minimum design thickness of concrete slab as 152.4 mm (6 in.). Thispaper introduces a novel extension of the AASHTO M-E framework for the design of low-volume joint plain concretepavements (JPCPs) without modification of Pavement ME. It utilizes multi-gene genetic programming (MGGP)-based computational models to obtain rapid solutions for JPCP damage accumulation and long-term performanceanalyses. The developed MGGP models simulate the fatigue damage and differential energy accumulations. Thispermits the prediction of transverse cracking and joint faulting for a wide range of design input parameters and axlespectrum. The developed MGGP-based models match Pavement ME-predicted cracking and faulting for rigidpavements with conventional concrete slab thicknesses and enable rational extrapolation of performance predictionfor thinner JPCPs. This paper demonstrates how the developed computational model enables sustainable lowvolumepavement design using optimized ME solutions for Pittsburgh, PA, conditions.

关键词： Mechanistic-empirical pavement design guide Low-volume roads Concrete pavement Transverse cracking Joint faulting Multi-gene genetic programming(MGGP)

Factorizations of groups and related topics

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Science China Mathematics 2009年第2期52卷 217-230页

作者： AMBERG Bernhard KAZARIN lev Fachbereich 08 Universitaet MainzGermany Department of Mathematics Yaroslavl State University

This is a survey of some recent progress in the theory of groups with factorizations. Some of the methods can be used to obtain information about finite groups in general, nilpotent algebras and nearrings.

关键词： products of groups factorizations 20D40

Development and prospects of the fire space monitoring system in Kazakhstan

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Frontiers of Earth Science 2012年第3期6卷 276-282页

作者： lev SPIVAK Oleg ARKHIPKIN Gulshat SAGATDINOVA Space Research Institute National Center of Space Research and Technology Shevchenko Almaty 050010 Kazakhstan

This article provides a brief description of the fire space monitoring system in Kazakhstan, including the GIS-technology incorporated in its structure. The system performs operative space monitoring of fire areas and burnt areas, mapping of large fire areas, analysis of seasonal and long-term dynamics of burnt areas, and estimation of fire risk zones. Examples of output information obtained from space monitoring of fires are given. Possible directions of development of fire space monitoring in Kazakhstan are specified.

关键词： space images remote sensing fire space monitoring fire areas burnt areas operating mapping,zones of high fire risk

Exploration and determination of the principles of rotary-percussive underground slimhole drilling

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International Journal of Mining Science and Technology 2014年第2期24卷 245-249页

作者： Shadrina Anastasija Saruev lev Institute of Natural Resources Tomsk Polytechnic University Institute of High-Technology Physics Tomsk Polytechnic University

A possibility of the efficient use of rotary percussive drilling to provide drilling smaller diameter holes(40–70 mm) both in mining and prospecting is disclosed herein. A new construction designed for the nipple thread connection is described. The relative amplitude variation, change of power pulse time and energy in their propagation throughout the drilling tool are determined. A possibility of the efficient power pulse transfer along the drill string to the rock destruction tools with new nipple connections which allow automating the make-up and breakout system of drill pipe was supported by experiments.

关键词： Rotary-percussive drilling Smaller diameter holes Drill string Nipple thread connection Power pulse Percussive energy