多属性决策中属性值大小对其权重的影响

研究属性值大小对其属性权重的影响. 在常用权重分配方法的基础上,通过引入模糊集合的方法,提出了适合该情况下的属性分配方法.实例研究结果表明,考虑属性值大小的决策方法比传统的决策方法更为合理.     

粒子群优化算法在多参数拟合中的应用

提出一种新的自适应粒子群优化算法,以解决梯度法为基础的算法在进行多参数拟合时因各参数之间相关性较高而带来的拟合上的问题．该粒子群优化算法采用自适应变异和动态自适应调整搜索范围、惯性权重相结合的改进策略,数值模拟了将该算法应用于测量薄膜热物性时的多参数拟合,结果表明该算法是可行和有效的．     

The test freezing temperature of C2―C6 dicarboxylic acid: The important indicator for ice nucleation processes

The importance of organic compounds as significant constituents of atmospheric aerosols, and cloud condensation nuclei （CCN）, as well as players influencing the tropospheric oxidation and atmospheric energy budget, have been increasingly recognized. Low molecular weight dicarboxylic acids （LMW-DCAs） are significant identified portions of atmospheric condensed matter including aerosols, fog and clouds. Besides the photochemical transformation of DCA, the implication of organic matter in ice nucleation processes has been considered. In this study, we investigated the freezing temperature of pure and mixed （C2-C6） DCA solutions in ultra-pure water and tap water solution droplets using a freezing nucleus counter at different pH, and in different water ionic conditions. The mean freezing temperature of different mixture of LMW-DCA in ultra-pure and tap water solution droplets ranged from -24.1±2.8 to -21.3±3.9℃ and -10.2±2.2 to -9.5±2.2℃, respectively. The mean freezing temperature of the control （ultra-pure and tap） water droplets （-22.6±3.5℃, 11.2±2.4℃） was also measured. The results, and their implications in atmospheric chemistry and physics of the atmosphere will be discussed.     

基于不确定orness测度约束的MEOWA算子权向量模型

考虑orness测度水平为不确定型的情况下如何求解MEOWA算子权向量问题。结果表明：不确定型orness测度下求解MEOWA算子权向量可以转化为相应orness测度区间端点或内点时的MEOWA权向量的求解,并对两者的关系进行分析。将该方法应用于某化工建设项目环境影响技术评估,算例表明该方法的可行性和有效性。     

一个核含参数且-2齐次的Hilbert型不等式

通过估算权系数, 建立一个核含参数且-2齐次的Hilbe rt型不等式及其等价式, 并研究了逆向不等式的情形.     

研究和培养高职学生的新视角：积极心理学

以积极心理学的视角看待高职学生,实施积极心理教育,对重塑高职学生形象,提高高职教育质量,具有其它方式不可替代的意义。对高职学生实施积极教育的策略是：引导学生积极地认识过去,会同学生积极地面对现在,培育学生积极的人格特质,创设满足学生合理需要的平台。     

几种抗氧化剂对螺旋藻混合营养培养影响的比较

研究了不同浓度抗氧化剂Na2S2O3、Vc、Cys对钝顶螺旋藻混合营养培养的影响.以干质量作为生长指标,培养9 d后,测定细胞干质量,发现随着抗氧化剂浓度的增加,细胞干质量逐渐增加,但到一定浓度后,细胞干质量开始下降.最大细胞干质量分别是:2.42、1.81、1.71 g/L,抗氧化效果以Na2S2O3最好.     

基于分形级配理论的油井水泥体系设计及评价

针对目前油井水泥混合料配比设计困难、缺乏合理颗粒级配模型的现状,基于分形几何理论建立了颗粒群分形连续级配模型.利用激光粒度测试仪分析了级配原材料的粒径分布状况,并将分形级配模型与Andreasen方程进行对比,得到实现最紧密堆积的分形维数范围.结合塔里木现场要求取分形维数为2.561,优化设计出浆体密度为1.40 g/cm3的三元体低密度水泥浆体系,并对体系性能进行了室内评价.结果表明,该体系水泥石抗压强度(24 h)大于18.4 Mpa,养护压力对强度影响很小,水泥浆失水量和游离液含量较低,稠化和流变性能满足要求,体系稳定性好,验证了体系粒径分布的合理性和分形级配模型的可行性.     

两种移动最小二乘法在曲面拟合中的对比研究

文章首先介绍了移动最小二乘逼近法和移动最小二乘插值法,然后分别将两种方法运用于曲面拟合,用MATLAB编程实现算例,对比精确解和两个数值解.结果表明移动最小二乘插值法精度较高.     

Experimental Study of Integration and Polyblends Performance for Improved Mixing-Extruding Machine

One improved mixing-extruding machine was introduced as the second-generation product of the mixing-molding integrated technology. In the extruding system,the conventional single screw extruder was substituted by a special conical twin-screw extruder,resulting in stronger feeding ability,more stable extrusion pressure,and better quality of products. The integrated mathematical model of mixing-extruding process was also established by theoretical derivation and optimization according to the experimental results.Then its accuracy was verified by the influences of the pressure of floating weight and the cooling water temperature of extruder on the mixing-extruding integrated process. The results showed that the changes of both parameters could give rise to the fluctuation of the temperature and apparent viscosity of polyblends, thus further influencing the screw rotation speed.