Hong Changyin Dept.of Mechanical , Electrical Engineering
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.001
Abstract:This paper introduces the calculating methods of bucketteeth position,specific operating sizes and respective lengths of 3 setsof hydraulic cylinders by coordinate transformation,establishes themathematical models of digging path enveloping curve and presents thecalculatinig method of the enveloping drawing area.In the meantime,example is given.
Li Heping , Zheng Zegen The Analytical , Thesting Centre
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.003
Abstract:本文用非离子表面活性剂聚乙二醇辛基苯基醚,胶束增溶分光光度法测定水中微量氯化物,方法简单、快速、准确.相对标准偏差1.39%—2.34%,加标回收率91.0%—106.5%.
Chen Chun , Fan Xingyi , Chen Shanlin Department of Civil Engineering
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.004
Abstract:In this paper,the axisymmetrical shells of suspension crosssection is studied by means of integral equation in initial parameter form.An example of the shells under uniformly distributed load is calculated.
Peng Taihua Department of Natural Science
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.006
Abstract:Bodendiek,Schumacher和Wegner猜想:每个带有一条弦的圈都是优美的。这个猜想在文[4]中得到了证明。K.M.Koh,D.G.Roges,H.K.Teo和K.Y.Yap证明了,每个带有两条连贯弦的圈都是优美的。K.M.Koh和N.Punnim又进一步地证明了每个带有3条连贯弦的圈也都是优美的。在本文中,我证明了,某些带有更多弦的圈,即C_(4s)(r),C_(4·2t)(k_0,k_1,…,K_t)都是优美的。
Zhang Jinzhu Hubei Huanggang Teachers College
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.007
Abstract:This paper presents a construction method of square magicsquare and twofold magic square,and describes how to change the cons-truction into a pair of magic square Latin squares.As soon as a pair ofmagic square is constructed,the square and twofold magic square can bewritten.Then the number of the same order twofold magic square willbe infinite if it exists.
Chen Lin Department.of Mechanical Electrical EngineeringCui Jia , Wu Huibi Dept.of Civi Elngineering
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.008
Abstract:半刚性连接钢框架设计中,确定节点的弯矩M—转角θ关系往往是一件较困难的事。目前采用的方法多以已知实验数据为基础,在假定函数形式的基础上拟合出一个经验公式。由于对各种不同的M-θ曲线采用了固定不变的函数模型,造成拟合曲线或者达不到要求的设计精度,或者项数过多,这些都给实际运用带来了不便。本文采用一种具有自适应能力的函数模型,根据具体问题确定函数形式,既避免了公式项数过多、过繁,又能达到设计所要求的计算精度。所得M-θ曲线形式简洁,使用方便,对于半刚性连接钢框架的设计具有较高的实用价值。
Zheng Huaili Department of Natural Science
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.009
Abstract:本文研究了利用BF_4~-离子选择性电极测定三价镀铬液中H_3BO_3的新方法。本方法不需分离Cr~(3+),也不用调整pH;设备简单,手续简便。回收率为95%—104%,相对标准偏差为2.5%,线性范围为5×10~(-2)~5×10~(-5)mol·L~(-1),检测下限可达5×10~(-6)mol·L~(-1)。镀铬液各组分含量变化影响也小。本方法适合于测定不同配方镀铬液中的H_3BO_3。
Zhong Shusheng Chongqing Institute of Architecture , EngineeringGuo Jianhua Wnhan Institute of Municipal EngineeringWang Zuhua South China University of Technology
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.010
Abstract:In order to probe into the shear resistant behaviors ofsteel reinforced concrete(SRC)restrained beams,three test beams underconcentrated loads have been tested.A full range analysis of the testbeams is conducted by using nonlinear finite element(NLFE)techique,and a good agreement with the experimental results is achieved.Theshear resistant mechanism of SRC restrained beam and the main factorsaffecting its shear strength are analysed.It is found that when theavailable shear strength formula for simply supported SRC beams is usedto calculate the shear strength of SRC restrained beams,the result turnsout to be conservative,so it is suggested that the shear strength of SRCrestrained beam could be calculated by the corresponding formula ofsimply supported SRC beam,adopting calculation shear span ratio.Thepractical formula is proposed in the paper.
Zhang Chenghai Department of Adult Education
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.011
Abstract:In this paper,the structure of assembly foundation oferosion protection,its design and construction procedure are studied.Itis the development of double wall steel open caisson and reinforcedconcrete open caisson.Based on the data collected in tests,some difficultproblems about the principle of expanding foundation erosion prote-ction in deep water and construction methods are resolved.Comparedwith other foundations,the assembly foundation narated in this papercan decrease the time limit and construction cost of a project.Themethod may de better for solving the problem of bridge foundation indeep water.
Wang Bingle , Zhou Shouguang , Song Liquan , Yu Zhigang Dept.of Mechanical , Electrical Engineering
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.012
Abstract:This paper is one of the achievements of the researchitem for computer-aided design of tower crane's steel structure.In thepaper,taking the well-base structure as an example,first the method establishing the mechanical model is explained for the base structure ofa movable tower crane.Then the math model of its optimal design andthe N-S figures for the computer program is described and calculatedusing discrete optimal technology.Finally the problems related to thedesign for the base structure of a movable tower crane are briefly illu-strated.
Wang Qi Department of Natural Science
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.013
Abstract:In this paper,by the use of Farkas lemma and its inve-rse proposition,the generalized Kuhu-Tuoker conditions for the existanceof strong minimum point in differential multiobjective programming inBanach spaces and the existance of sufficient condition of weak Paretominimum Foint are derived.
Wang Jifeng Dept.of Mechanical , Electrical Engineering
1992, 14(1). DOI: 10.11835/j.issn.1674-4764.1992.01.014
Abstract:本文提出了描述单特征值系统的一种特殊形式——“单值——约当(Jordan)标准形”,针对这一标准形系统,给出了能控性和能观测性判据、状态转移阵Φ(t)各元的递推计算式,以及该标准形与对角线标准形间相互转换的非奇异变换矩阵P的表达式等。
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