矿物加工与综合利用实验中心建设与教学实践

中央与地方共建高校优势特色学科实验室项目——矿物加工与综合利用实验中心依照项目要求进行了建设实施。项目工作组通过周密规划、认真实施,于2008年1月至2010年1月分两期顺利完成了实验中心的全面建设。实验中心建筑面积640m2,分7个实验室,包括破碎机在内的各类设备200余台(套),年开实验项目56项,年人学时数8 400学时。实验中心重视人力建设,制定了严格的运行保障机制,不断改进实践教学内容与方法,教学效果评价良好。     

Experimental investigation on the effects of process parameters of GMAW and transient thermal analysis of AISI321 steel

Gas metal arc welding （GMAW） develops an arc by controlling the metal from the wire rod and the input pro- cess parameters. The deposited metal forms a weld bead and the mechanical properties depend upon the quality of the weld bead. Proper control of the process parameters which affect the bead geometry, the microstructures of the weldments and the mechanical properties like hardness, is necessary. This experimental study aims at developing mathematical models for bead height （HB）, bead width （WB） and bead penetration （PB） and investigating the effects of four process parameters viz： welding voltage, welding speed, wire feed rate and gas flow rate on bead geometry, hardness and microstructure of AISI321 steel with 10 mm thickness. The transient thermal analysis shows temperature and residual stress distributions at different conduction and convection conditions.     

东南亚华人财团的地位和作用论析

本文总体阐述东盟国家华人财团叨年代的发展战略、在所在国经济中的相对实力和地位以及在东盟国家经济发展中所起的作用。     

基于产权主体视角的独立学院财会制度设计研究

独立学院,作为高等教育发展过程中一种有效的办学模式,具有自身独特的办学理念和办学目标——培养具有较强实践操作能力的应用型人才。本文通过分析产权主体诸如地方政府、母体学校、合作者、管理层以及独立学院教师与学生对独立学院财会制度设计的影响,揭示了独立学院财会制度在会计制度的选择、会计核算基础、会计科目设置、财会体制、资产监管等方面面临的困境,并借鉴典型民办高校的成功财会制度设计经验,为独立学院财会制度设计的主要内容提供实践思路。     

A new three-dimensional heat flux-temperature integral relationship for half-space transient diffusion

This paper derives a new integral relationship between heat flux and temperature in a transient, three-dimensional heat conducting Cartesian half space (x>0, y∈(−∞,∞), z∈(−∞,∞)). A unified mathematical treatment has been developed based on operational and transform methods; and singular integral equation regularization. Regularization is accomplished based on a series of observations involving the diffusive nature of the operator. This newly developed relationship provides the local heat flux perpendicular to the front surface at any location within the half space. This expression suggests that an embedded plane of temperature sensors parallel to the surface can be used to acquire the local, in-depth heat flux in the x-direction. The relationship does not require a priori knowledge of the surface boundary condition which has analytically been removed in the process. The ill-posed nature of diffusion is highlighted owing to the appearance of the heating/cooling rate (°C/s) in the integrand of the new relationship. Integral relationships of this type are highly useful for experimental investigations since the in-depth heat flux can be extracted from well-established temperature transducers.     

A three-dimensional solution for plates and laminates

A general three-dimensional solution is presented for statics and dynamics of plates, homogeneous or laminated, of orthotropic materials. The solution is in series form. Using parts of the general solution a variety of problems, especially of rectangular configurations, can be solved. As Mindlin's approximate analysis for vibration of thick plates is often adequate for specific practical purposes, a general solution for Mindlin's analysis is also given.     

Studies on the antiperoxide and antihaemolytic action of polyamines using human erythrocytes

Blood RBC's were used to study the role of polyamines, putrescine, spermidine and spermine individually as antioxidants against the peroxidative action of H₂O₂ which leads to haemolysis of erythrocytes. Results indicated that putrescine did not act as antioxidant at all concentrations used in our studies. However, spermidine and spermine suppressed peroxidative changes in RBC's due to the action of H₂O₂ and this suppression was greater with higher concentration of these individual polyamines used, separately. Further, all the three polyamines decreased haemolysis of erythrocytes at all concentrations studied. The action of putrescine to suppress haemolysis of RBC's without showing antioxidant property hypothetically suggests that these properties of respective polyamines may have independent mechanism of action.     

历史视野中的澳门

澳门在历史上的地位是显赫的 ,它是中国历史的缩影 ,澳门问题是殖民主义的产物 ,澳门回归是中国人民完成统一大业使命的百年追求。