壬基酚聚氧乙烯（4）醚磺基琥珀酸单酯二钠盐的合成与性能研究

考察了壬基酚聚氧乙烯（４） 醚磺基琥珀酸单酯二钠盐的合成工艺条件,并测定其表面化学性能。最佳合成工艺条件：ｎ（ 酚醚）∶ｎ（ 顺酐） ＝ １∶１ ．０５ ,酯化温度１２０ ℃,酯化时间４．０ ｈ ,ｎ（ 顺酐）∶ｎ（ 亚硫酸钠） ＝ １∶１．０５ ,磺化温度８０ ℃,时间２ ．０ ｈ;整个反应在氮气保护下进行,终产物得率＞ ９６ ％ 。产物主要表面化学性能：临界表面张力２ ．９５×１０ － ２ Ｎ·ｍ －１ ,临界胶束浓度７ ．９４ ×１０－ ４ ｍｏｌ·Ｌ－ １ ,钙皂分散力ＬＳＤＰ为３２ ％ ,乳化性能２ ．４８ ｍｉｎ ,去污力９０ｓ。     

喷射成形7075铝合金欠时效回归再时效热处理

采用透射电镜、拉伸测试等方法,研究欠时效回归再时效处理对喷射成形7075铝合金显微组织和力学性能的影响,并与单级峰值时效和常规回归再时效处理相比较。结果表明,采用120℃×12h欠时效预处理比120℃×24h峰值时效预处理更有利于在回归处理后合金晶内析出相的回溶,回归处理过程可使合金晶界析出相充分断开,再时效后晶内的析出相细小弥散,合金抗拉强度和屈服强度分别为776和723MPa,均高于T6峰值时效和常规回归再时效水平。     

钼变形抗力的研究

在Gleeble-1500热模拟试验机上，分析钼的高温变形特征，其变形温度为1100～1400℃，变形速率为1-50s^-1，变形程度为0-0．6，并对钼板进行塑性变形抗力的研究，采用非线性回归方法建立钼板的变形抗力模型。获得了钼板的变形抗力曲线图，对不同的数学模型结构进行回归比较，提出拟合精度高的变形抗力的数学模型，该模型具有较高的精度及良好的数值稳定性。     

表面n沟CCD的电离辐射损伤

本文报道了150光敏元表面n沟CCD(电荷耦合器件)在不同能量电子和γ射线辐照后的电离辐射效应。试验结果表明,转移失效率在≤10Gy时已明显增大。但大多数器件在累积剂量≤50Gy时,通过调整“胖零”注入仍可工作。在高剂量辐照期间,不同栅偏压器件的转移效率退化存在较大差异。应用高频和准静态C-V技术分析了参数退化的原因。     

基于GPS和蓝牙技术的便携式农田信息采集系统

提出了基于GPS和蓝牙技术的便携式农田信息采集系统的设计方案,采用典型的MSP430F169芯片作为微处理器,结合温度、湿度传感器、E531GPS模块将采集到的信温度、湿度和采集点的经纬度信息利用T7024蓝牙芯片传送至终端显示模块。实验结果表明该设计方案有效、可行,达到了农田信息采集的功能要求,并且具有体积小、成本低、功能强的特点。     

Phtocrosslinking of polyethylene for production of thin wall insulated wire

A photocrosslinking precess for polyethylene and its industrial irradiation apparatus has recently been developed and used successfully in the manufactre of thin wall crosslinked polyethylene-insulated wires. Polyethylene (PE) resin with the desired amounts of additives, such as photoinitiator, multifunctional crosslinker, and antioxidant is mixe homogeneously. The amixture of PE is granulated, and then extruded on a conductor wire. The coated PE layer in the melt is subsequently irradiated in a specially designed UV irradiation apparatus for 5 to 10 s. The studies show that the photocrosslinked PE-insulation high voltage television wires produced by this new technique possess excellent electrical and mchanical properties and much lower operating cost compared with wires produced by the electron beam crosslinking technique.     

重量法测定水中悬浮物和全盐量的不确定度评定

随着移动技术的迅猛发展,传统的纸质海图开始走向移动平台.然而,移动环境下使用环境的改变以及使用场景的多样性给电子海图的显示带来了新的挑战:在尽量减少用户交互的前提下自动调整地图显示,最大限度满足用户需求.论文基于上下文的地图感知模型从上下文因素选取、模型建立以及触发机制等方面对电子海图的数据组织与显示进行了研究,优化了移动海图的调度与显示,为基于上下文的智能化电子海图研究提供了理论和方法上的借鉴.     

沈阳地域性建筑创作刍议

地域性建筑创作是维持建筑文化多样性、弘扬地域建筑文化有效的设计方法论。本文分析了地域性建筑理论研究及实践创作现状及问题点,提出紧抓城市文化特质是有效的地域性建筑创作方法之一。文章进而分析了沈阳的城市文化特质,指出工业文化特质、满清文化特质及革命文化特质三方面是沈阳地域性创作的三个重要着手点。     

Background lead and cadmium exposure of adult women in Xian City and two farming villages in Shaanxi Province, China

The objectives of the present study are: (a) to clarify the current levels of environmental exposure to lead (Pb) and cadmium (Cd) in Shaanxi Province in China in comparison with levels in other parts of mainland China; (b) to examine if there is any urban-rural difference in Pb and Cd exposure; and (c) to quantify the role of cereals as the dietary source of environmental exposure to these metals. For this purpose, triplet surveys on lead and cadmium exposure were conducted in the provincial capital of Xian and two farming villages A and B in Shaanxi Province, China in 1997. The grand geometric mean for lead (Pb) intake via foods (Pb-F), Pb in blood (Pb-B) and Pb in urine as corrected for creatinine concentration (Pb-Ucr) were 30 micrograms/day, 33 micrograms/l and 5 micrograms/g creatinine, respectively, with significant differences among the survey sites, e.g. Pb-B being higher in Xian (43 micrograms/l) than in the two villages (38 and 22 micrograms/l). The counterpart values for cadmium (Cd) intake via foods (Cd-F), Cd in blood (Cd-B) and Cd in urine (Cd-Ucr) were 6.1 micrograms/day, 0.46 microgram/l and 2.8 micrograms/g creatinine, respectively, with no substantial inter-survey site difference. Thus, it was possible to conclude that, from comparison with the values reported in 1990s literature, the exposure of Shaanxi people to Pb and Cd is no higher than, and even possibly lower than, the levels reported for people in other parts of mainland China. The exposure to Cd was almost exclusively from foods, whereas the exposure to air-borne Pb was large enough in Xian to explain higher Pb-B and Pb-Ucr than the level in Village B despite lower Pb-F in Xian than in Village B. Cereals (wheat, rice, maize and foxtail millet) contributed 26 and 84% of dietary Pb and Cd intake, respectively.     

常用的几种低热粘结温度柔软型PP短纤维的剖析与研讨

应用ＤＳＣ,ＷＡＸＤ,ＳＥＭ和红外光谱等技术对热轧法生产卫生用薄型非织造布的几种常用纤维进行了剖析,并对其形态结构、热性能、力学性能、含油率、含湿率、抗静电性和渗水性等进行了比较和研讨。结果表明：低热粘结温度ＰＰ短纤维多为细旦、低强、高伸度、低起始熔融温度和低序态,且适宜的含油率、含湿率和表面比电阻可保证梳理性好,成网均匀