基于Vague集的军队物流商选择

军队转型建设对物资保障能力提出了更高的要求, 选择优秀的物流商进行合作是重要的有效手段, 如何选择一个合适的物流商是一个亟待解决的问题。本文首先在综合分析军队需求之后, 构建了由6个一级指标, 20个二级指标组成的物流商评价指标体系, 在此基础上利用基于对应分析的分类方法将物流商初步划分为类, 从中选择较优的前两类企业作为考察的合作伙伴; 然后采用基于Vague集的方法进行进一步排序, 从中选择最合适的物流商; 最后结合实例证明了方法的有效性。     

Sodium chloride methanol solution spin-coating process for bulk-heterojunction polymer solar cells

The sodium chloride methanol solution process is conducted on the conventional poly(3-hexylthiophene)(P3HT)/[6,6]-phenyl-C61-butyric acid methyl ester(PC_(61)BM) polymer bulk heterojunction solar cells. The device exhibits a power conversion efficiency of up to 3.36%, 18% higher than that of the device without the solution process. The measurements of the active layer by x-ray photoelectron spectroscopy(XPS), atomic force microscopy(AFM), and ultraviolet photoelectron spectroscopy(UPS) indicate a slight phase separation in the vertical direction and a sodium chloride distributed island-like interface between the active layer and the cathode. The capacitance–voltage(C–V) and impedance spectroscopy measurements prove that the sodium chloride methanol process can reduce the electron injection barrier and improve the interfacial contact of polymer solar cells. Therefore, this one-step solution process not only optimizes the phase separation in the active layers but also forms a cathode buffer layer, which can enhance the generation, transport, and collection of photogenerated charge carriers in the device simultaneously. This work indicates that the inexpensive and non-toxic sodium chloride methanol solution process is an efficient one-step method for the low cost manufacturing of polymer solar cells.     

非线性控制系统的稳定性分析

通过引入拟奇次近似系统的概念,针对具有拟奇次近似系统的二维系统给出了零解是一致渐进稳定的充分条件.并由算例说明该方法在实际应用中是有效和方便的.     

模糊综合评判中非线性隶属函数的确定

分析了目前隶属函数确定方法中的缺陷,构造了具有非线性性质的隶属函数,将其划分为成本型、效益型和适中型指标.最后,应用于五所高校实验室评估,验证了隶属函数构造的科学性和有效性.