Abstract:By means are measured of the direct observation of the packing behavior of sand in the vacuum suction molding process.The air and powder pressure,density distribution of sand core.The packing mechanisms are studied based on these experimental results.It found that the density distribution of sand core is elucidated by powder pressure theory,and the density distribution is decided by air flowing,sand chocking and shearing.

Abstract:A method,stroboscopic harmonicbalance method which is used to solve strong nonlinear system, is proposed. The method is used to find the solution of strong nonlinear system. In investigation,the existence conditions of primary resonance solution and subharmonic resonance solutions are obtained. The results which are obtained by the stroboscopic harmonicbalance method are compared with those by computer numerical simulation. The results show that the stroboscopic harmonicbalance method is correct in qualitative analysis and it can meet the demands in engineering.

Abstract:A fast median filtering algorithm basing on the coherence of data in adjacent windows is presented.During median filtering,only the first median value is found by conventional squencing algorithm,the other median values are obtained by bisecting search method and quickinserting new element in sequenced window.For convenience of moving filter window along signal data,a data structure is desinged,which can make the new input element to cover output element and greatly reduce the quantity of computation.A 2-dimensional fast median filtering method by moving filter window along snack path is also introduced.

Abstract:随着制造业日益向多品种小批量的生产方式转变，质量管理工作的重点也相应地转移到对质量事故的事前预防上，以实现主动的质量管理；在制造企业的质量系统中，质量信息主要是两种方式进行流动：质量信息链和质量信息环。质量体系也是以这两种形式来管理的，通过分析现代市场竞争对制造企业质量管理的要求，探讨了制造企业集成质量系统的体系模型，及其在ＣＩＭＳ环境中的实现形式。

Abstract:The Direct Torque Control principle of induction motors are analyzed.The method of m line selecting the space voltage vector and the concept of the reverse voltage vector are proposed.Aimed at the speed close loop control system,adaptive tracing approximate control strategy based on double modulus state identification is proposed,and the simulation results using the circle flux path are given.

Abstract:The method to carry out time frequency analysis of engineering signal using wavelets transform is discussed and the formuli of quantitative relationship between the position & width of time frequency window of wavelet transform and the scale & sampling interval is put forward.

Abstract:The decision objects and evaluation target architecture in choosing Management Information Systems (MIS) softwares for manufacturing enterprises are proposed. Fuzzy mathematics comprehensive evaluation method is used in decision analysis. The method in is applied practically.

Abstract:A micro/macroscopic analysis of PD3 pearlitic steel with layered microstructure is carried on.Based on the compatibilit conditions of stress and strain at the interface between two layers as well as the mixed law of composites,constitutive equations of an effective homogeneous inclusion are obtained.combining these equations with the K B W self consistent model,the micro macroscopic transition has been estabilished.It turns out that the analysis is capable of determining the overall responses of materials as well as local stress evolution in microstructure under monotonic and cyclic loading.It is found that stress in the thin cementite layer is very high.This is caused by intersification of the local plastic flow of the soft ferrite layer in which more loading is transferred cycle by cycle to the hard phase.Furthermore,a strength dimension law that the strength is inversely proportional to the square root of the layer thickness is developed to explain the high strength of the cementite layer.

Abstract:A failure diagnosis model of neural networks for the vibration failure feature of steam turbine-generator set is established on the basis of the improved BP algorithm ,and used for diagnosing practical generator set,the results of verification show that the method is effective.

Abstract:The new neural network algorithm for searching graph minimal cut set,called NNMC algorithm, is established on the basis of construction of Hopfield Network energy function according to the concrete problem.In NNMC algorithm, which suffciently uses the fast convergence of Hopfield Network, a way to avoid the local minimum is carried out.

Abstract:A numerical method calculating the forward problem of electrocardiogram (ECG) has been presented. By using this method, the torso part including anisotropic muscle layers has been discretized by means of the finite element method (FEM). The rest of torso have been divided into the surface elements by the boundary element method (BEM). The effects of the skelltel muscle layers over thorax wall, have been discussed in terms of a three-dimensional torso models.

Abstract:In this paper, a predictive control approach using neural networks for active power filter is proposed. The control system of active power filter using this method make using of the internal model control technology based on neural networks, meanwhile, to solve its questions such as lag because of calculating using neural networks, a predictive model based on neural networks is introduced. Simulation analysis shows that this control approach can compensate the lag of system and take advantage of self-adaptive characteristic of neural networks. Good result can be obtained.

Abstract:In this paper,the fracture of grey cast iron weld has been observed by SEM,and the mechanisms of the cracking initation and progression have been discussed.The results show that the fracture of grey cast iron weld is quasi cleavage.

Abstract:The melting point and viscosity of SrO SiO 2 CaO Al 2O 3(5%) Na 2O(10%) CaF 2(10%) flux system have been measured,and the curve charts of the melting point and viscosity are drawn.Moreover,the mathematical relations of properties with chemical composition are founded.The best range of chemical composition for mould flux containing SrO is presented via analyzing the curve charts.

Abstract:The divagation of the internal stress in diamond films is analyzed .It's found that due to the unknown directions of the stress and crystallographic axes , the proportional parameter to express the relationship between the stress and the shift of Raman spectrum is hard to obtain precisely , resulting in the divagation of the internal stresses which are calculated from the shift of Raman spectrum.

Abstract:The models,principle,deducing constitutive equation by means of variational method,and general solution are researched for bi moment in anisotropic spacial rod with opening thin walled seation.

Abstract:提出了一种求解的非线性地震反应的二阶矩阵扰动振型叠加方法，通过与Ｗｉｌｓｏｎ－θ法的比较，验证了它的高效性与可行性。

Abstract:On the basis of coal seam having outcrop of coal seam and outlet on ground,the method for calculating coalbed gas pressure from the one-dimensional stable gas flow equation by considering deeply the influence of in-situ stress gradient and geothermal temperature is presented. In some mine, the theoretically computing and measuring results of coalbed gas pressure show that the in-situ stress gradient and the geothermal temperature have important influence on the calculation of coalbed gas pressure, and if the factors are drew into the calculation of coaled gas pressure,it will make the results much more accurate.

Abstract:采用ＭＴＳ８８０±５００ 型材料试验机，对攀钢朱矿东山头边坡辉长岩进行了单轴压缩蠕变试验研究，拟合出蠕变曲线的经验公式。经综合分析，提出了试验辉长岩的蠕变理论模型，确定了岩石的蠕变参数和长期强度。

Abstract:Systematic studies are made on experimental design and optimization.The orthogonal array design(OAD) is equal to or better than the homogeneous/uniform design (HUD) in some principlal respects and that the homogeneous design (HUD) has its advantages,especially on the case with few experiments done.

Abstract:WEB(Web based Network Management) is new trend of Network Management.Features of WBM and related international standards are described.AI environment integrates with WBM is the next trend of network management too.Integrated and intelligent WBM system will be developed in the futare.

Abstract:对内热式流化床升温特性进行了试验研究和数值模拟。结果表明：内热式流化床热处理电炉具有升温快、升温热效率高的优点；升温功率对炉子的升温特性有较大影响，而流化风速的影响效果不明显；模型的预测结果与试验结果基本吻合。

Abstract:研究了四川白皎无烟煤电导率与甲烷压力和外加电压的关系。煤吸附甲烷后其交流和直流电导率都将增大。在直流电场中，煤的电导率σ与外加电压Ｕ和甲烷压力ｐ 成正比，其双变量方程为σ（ｐ，Ｕ） ＝ １ ．４６４ ＋ ０ ．７０５ｐ ＋ ２．３５５ ×１０－ ３ Ｕ＋ ２ ．９３０ ×１０ － ３ Ｕｐ 或σ（ｐ，Ｕ） ＝ １ ．４８１ｅｘｐ（０ ．３６９７ｐ） ＋ ２ ．５４８ ×１０ － ３ Ｕｅｘｐ（０ ．６８５８ｐ） ；在交变电场中，电导率随甲烷压力的升高而增大，但与外加电压值无关。

Abstract:The model of conical membrane atomization for cone water jet is presented. The atomizational ability and dust-laying effect for water jet are investigated experimentally. Some results are useful for dust-laying and fire-extinguishing researchers and designers.