小型宽带微带天线的设计研究

针对移动通信终端小型化、集成化的发展趋势,本文提出一种中心频率为7.3 GHz的小尺寸宽频带天线.基于微带天线理论及单极天线的典型结构,改变三维结构、平面形状及介质的宽度,设计出一种新型的小型天线.考虑到影响天线特性的相关因素,利用HFSS11软件进行仿真优化,结果表明,该天线大小仅为16 mm×17 mm,绝对带宽可达3.2 GHz(S11＜-10 dB),远远超过了500 MHz.为一宽带小型天线.     

钛合金燕尾榫结构在不同疲劳载荷下的断口分析

对TC11钛合金燕尾榫连接结构在低周和高低周复合载荷作用下的断口特征进行了分析.结果表明:在微动环境下,微动磨损面上有表面金属掉块和不均匀的磨损擦伤,磨损表面出现腐蚀坑以及损伤区呈现层状及山丘状的塑性变形;在高低周复合载荷情况下,疲劳源处疲劳辉纹呈现以河流花样为主的复杂疲劳条纹,在裂纹扩展阶段,河流花样比较杂乱,裂纹扩展方向相对无序,每个低周周期中的疲劳台阶也不明显.     

MIKE11模型在东苕溪水源地水质预警及保护的应用

基于浙江省东苕溪干流水文特性,结合流域水质与污染物情况,应用MIKE11模型构建了流域水动力和水质耦合模型。率定河道糙率为0.018–0.022,氨氮降解系数为0.07–0.10/d,总磷降解系数为0.07;验证模型计算值与实际测定值吻合程度较高。模拟上游水污染突发事件发生后污染物到达东苕溪水源地取水口的时间,以此进行水质预警。计算水源地取水口发生水污染事件后不同水期条件和不同污染物的情况下需要的上游自净稀释水量,以保障饮水安全。     

多功能通用数字面板表的设计与开发

按照设计产品的一般步骤,基于宏晶STC11F60XE单片机,从设计目标、功能规划、硬件设计、软件设计以及说明书编写五个方面,完成一款具备测量直流电压、计数、定时、测量频率、比较输出以及远程通信等多功能通用数字面板表的设计,给出了一些经验总结,列举了开发过程中容易出现的一些问题及对策。     

关于0Cr13/SA-387Gr11Cl复合板复层产生锈迹和裂纹的原因及预防措施

本文对0Cr13-SA-387Gr11Cl复合板复层产生锈迹、裂纹的原因进行了分析探讨,并提出了预防措施。     

A Bayesian spatial econometric analysis of the 2010 UK General Election

The Conservative Party won the 2010 General Election in the United Kingdom, gaining the most votes and seats of any single party. Using Bayesian spatial econometric methods, we show that significant spatial dependence exists in Conservative voting behaviour and select the spatial Durbin model as the best model to explain this phenomenon. This paper examines these spatial effects as well as the effects of a range of economic, socio‐economic, and political variables. Perhaps the most interesting result is that incumbency has effects beyond an incumbent's own constituency.     

Some observations relating to the stability of the BODIPY fluorophore under acidic and basic conditions

4,4-Difluoro-4-bora-1,3,5,7-tetramethyl-2,6-diethyl-8-methyl-3a,4a-diaza-s-indacene (BODIPY) fluorophore was transformed into its corresponding 4,4-dimethyl, 4,4-dimethoxy and 4,4-diphenyl analogues. The stabilities of these BODIPY fluorophores in acidic (di- and trichloroacetic acid) and basic conditions (aqueous ammonium hydroxide) were investigated using ¹¹B NMR spectroscopy.     

Microstructure and model solute transport properties of transglutaminase‐induced soya protein gels: effect of enzyme dosage,protein composition and solute size

The diffusion of poly(ethylene glycol) (PEG) in transglutaminase (TGase) cross‐linked soya protein gels as affected by enzyme dosage and protein composition was investigated. PEG with different molecular weights (M_w) varying from 6000 to 400 000 g mol^?1 was selected. Results of this study revealed that the time‐related release of PEG from gel slices was found to be controlled by Fickian diffusion process. For PEG with M_w 6000 g mol^?1, the diffusion coefficients (D) were independent on the enzyme dosage and protein composition. However, for PEG with M_w ≥ 20 000 g mol^?1, there were strong dependences of diffusion on the solute size and on the gel network microstructure revealed by scanning electron microscopy (SEM), where more density gel network with smaller pores resulted in lower D of PEG. Lower D values of PEG with M_w ≥ 20 000 g mol^?1 were obtained in gels induced by 2 U g^?1 TGase, and the D values increased with increasing 11S ratio in gels. Moreover, data also showed that the diffusion of PEG with larger size was more sensitive to the variation of gel network.