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An Inverse Problem of an Unknown Source in a Heat Equation

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Systems Science and Systems Engineering 1998年第1期8卷 91-95页

作者： WEI Suhua Institute of Computational Mathematics, Academia Sinica, ZHENG Kewang hebei Science and technology univ.rsity.

Cannon has considered the problem of the determination of an unknown source in the heat equation from the overspecified data. In this paper we will describe a new regularization approach to give a numerical procedure ... 详细信息

关键词： heat equation inverse problem regularization method

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美育视角下的高校啦啦操教学实践研究

当代体育科技 2024年第11期14卷 52-55页

作者：展烨吴少帅李达河北科技学院河北唐山063000

在美育视角下,高校教育要对啦啦操运动进行合理的运用,从美育维度,促进学生审美素养的发展,丰富学生的精神生活。啦啦操集成了音乐、健身、舞蹈、娱乐等要素,作为一项体育运动,受到了大学生的广泛喜爱。该文分析了啦啦操的审美形式,针... 详细信息

在美育视角下,高校教育要对啦啦操运动进行合理的运用,从美育维度,促进学生审美素养的发展,丰富学生的精神生活。啦啦操集成了音乐、健身、舞蹈、娱乐等要素,作为一项体育运动,受到了大学生的广泛喜爱。该文分析了啦啦操的审美形式,针对高校啦啦操教学的现状,总结了美育视角下高校啦啦操的教学实践策略。

关键词：美育高校啦啦操教学

维普期刊数据库博看期刊

K_0-group and approximate similarity invariants of strongly irreducible operators

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Science China Mathematics 2008年第12期51卷 2231-2252页

作者： HE Hua1, SHI Rui1,2 & MA XiuJuan1 1 School of Science, hebei univ.rsity of technology, Tianjin 300130, China 2 School of Mathematics and Information Science, hebei Normal univ.rsity, Shijiazhuang 050016, China 1. School of Science Hebei University of Technology Tianjin 300130 China 2. School of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 China

Let H olenote a complex separable Hilbert space and L(H) denote the collection of bounded linear operators on H. An operator T ∈ L(H) is said to be strongly irreducible if T does not commute with any nontrivial idempotent. Herrero and Jiang showed that the norm-closure of the class of all strongly irreducible operators is the class of all operators with connected spectrum. This result can be considered as an "approximate inverse" of the Riesz decomposition theorem. In the paper, we give a more precise characterization of approximate invariants of strongly irreducible operators. The main result is: For any T ∈ L(H) with connected spectrum and ε > 0, there exists a strongly irreducible operator A, such that A - T < ε, V (A (A)) =～ N, K0(A (A)) ～= Z, and A (A)/rad A (A) is commutative, where A (A) denotes the commutant of A and rad A (A) denotes the Jacobson radical of A (A). The research is inspired by the recent similarity classification technique of Cowen-Douglas operators of Jiang Chunlan.

关键词： strongly irreducible operators Cowen-Douglas operators K0-group similarity orbit

Development of Full Automatic Flash Butt Welding with Digital Control

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武汉理工大学学报 2006年第S3期28卷 1097-1101页

作者： WANG Rui SUN Hexu WANG Hongwen Electrical and Automation School,hebei univ.rsity of technology,Tianjin 300130,China, Electrical and Automation School Hebei University of TechnologyTianjin 300130China

The hardware and software design of two digital control systems based on 80C196KB MCU for flash butt welder is introduced in this *** welding power supply is made of six-phase half-wave *** welding outer characteristic of welding machine is realized by digital PI algorithm with the voltage close-loop *** flashing curve is finished by elec- tric-hydraulic servo *** process control system transfers datum with power supply system by a serial communication inter- *** parameters of the control systems are collected by photoelectrical seclusion to avoid the disturbing of the electromagnetism in welding process.

关键词： flash butt welder digital control MCU PI adjustor welding power supply

Study on Influence of Initial Rolling Temperature for Rolling Process Based on Numerical Simulation

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武汉理工大学学报 2006年第S2期28卷 398-401页

作者： YANG Licheng LIU Bo XING Sufang ZHANG Runli (School of Mechanical Engineering,hebei univ.rsity of technology,Tianjin 300130,China School of Mechanical Engineering Hebei University of TechnologyTianjin 300130China

Wire rolling is a typical large deformation process and its principle is very complex,which includes material non- linearity,geometry non-linearity and boundary *** is difficult to obtain theory analytical results by trying to roll or physical experiment because they will induce many problems such as high cost,waste time and *** the rapid advance- ment of computing technology and numerical method,the finite element method is regarded as the best one,which can account for the large plastic deformation,thermo-mechanical coupling and complex boundary conditions of the rollers and the workpiece inter- actions in the rolling *** the different initial rolling temperature,the two-pass hot continuous rolling process of high- speed wire has been simulated accurately for the pre-finishing rolling *** metal fluxion law and the deformation field have been ***,temperature,rolling force and torque also have been simulated and *** results of simulation are useful for practical manufacture and the optimization of process-parameters.

关键词： initial rolling temperature therrno-mechanical coupling hot continuous rolling MSC.Marc

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坚决扛牢实现新型工业化这个关键任务

新型工业化理论与实践 2024年第1期1卷 1-6页

作者： Leading Party Member's Group of Ministry of Industry and Information technology of CPC 中共工业和信息化部

工业化是现代化的前提和基础,是一个国家和民族繁荣富强的必由之路。2023年12月召开的中央经济工作会议强调,要以科技创新引领现代化产业体系建设,大力推进新型工业化。全国新型工业化推进大会对推进新型工业化作出全面部署,强调要学深... 详细信息

工业化是现代化的前提和基础,是一个国家和民族繁荣富强的必由之路。2023年12月召开的中央经济工作会议强调,要以科技创新引领现代化产业体系建设,大力推进新型工业化。全国新型工业化推进大会对推进新型工业化作出全面部署,强调要学深悟透习近平总书记关于新型工业化的重要指示、重要论述,准确把握推进新型工业化的重大意义、重要原则、重点任务,完整、准确、全面贯彻新发展理念,坚持走中国特色新型工业化道路,加快建设制造强国。

关键词：新型工业化制造强国中国特色新型工业化道路新发展理念中央经济工作会议现代化产业体系大力推进创新引领

Application of High Shear Agitation for Desulfurization of Gasoline Using Ionic Liquids

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China Petroleum Processing & Petrochemical technology 2006年第4期8卷 41-45页

作者： Zhao Dishun 2 ZhangZhigang 1 Wang Jialei1 Wang Na2 Li Xiangyu 2 (1 College of Science, hebei univ.rsity of Science and technology, Shijiazhuang 050018 2 College of Chemistry and Pharmaceutical Engineering, hebei univ.rsity of Science and technology, Shijiazhuang 050018) College of Chemistry and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China College of Science Hebei University of Science and Technology Shijiazhuang 050018 China

The high shear agitation device was first adopted for gasoline desulfurization by ionic liquids. The effect of benzylimidazol fluoborate in desulfurization of gasoline and the influence of moisture on deuslfurization rate were investigated. The experimental results showed that the ionic liquid could effectively decrease the sulfur content of gasoline and the optimal conditions were as follows: The reaction could be carried out at room temperature, a volumetric ratio between oil and the liquid of 2:1, a volumetric ratio between water and ionic liquid of 0.04:1, a rotational speed of 5 krad/s, and a reaction time of 1 minute. The desulfurization rate of gasoline reached 53.6%, and the gasoline yield was up to 97.3%. The ionic liquid could be recycled for repeated use, and the use of high shear agitation for gasoline would have good prospects.

关键词： ionic liquids desulfurization gasoline high shear agitation

Some Properties of Cauchy-Type Singular Integrals in Clifford Analysis

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Journal of Mathematical Research with Applications 2012年第2期32卷 189-200页

作者： Heju YANG 1,2,Yuying QIAO 1,Sha HUANG 1 1.College of Mathematics and Information Science,hebei Normal univ.rsity,hebei 050016,P.R.China 2.College of Science,hebei univ.rsity of Science and technology,hebei 050018,P.R.China College of Mathematics and Information Science Hebei Normal University Hebei 050016

First,we give a module estimation of the singular integral with a differential *** by proving the existences of Cauchy principal value we obtain the transformation formula of the Cauchy-type singular integrals with a ... 详细信息

关键词： Clifford analysis Cauchy principal value Cauchy-type singular integral with a parameter transformation formula.

ELASTIC CALCULATION OF STRESSES IN RINGS USING AIRY STRESS FUNCTION

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Acta Mechanica Solida Sinica 2011年第S1期24卷 95-106页

作者： Yicai Sun 1 (hebei univ.rsity of technology, Tianjin 300130)

Stress calculation formulae for a ring have been obtained by using Airy stress function of the plane strain field with the decomposition of the solutions for normal stresses of Airy biharmonic equation into two parts when it is loaded under two opposite inside forces along a diameter. One part should fulfill a constraint condition about normal stress distribution along the circumference at an energy valley to do the minimum work. Other part is a stress residue constant. In order to verify these formulae and the computed results, the computed contour lines of equi-maximal shear stresses were plotted and quite compared with that of photo-elasticity test results. This constraint condition about normal stress distribution along circumference is confirmed by using Greens’ theorem. An additional compression exists along the circumference of the loaded ring, explaining the divorcement and displacement of singularity points at inner and outer boundaries.

关键词： elastic circular ring calculation of stresses Airy stress function solving the biharmonic equation plane strain field contour lines of equi-maximal shear stresses a constraint condition about normal stress distribution along circumference