用于KDP晶体保护的AF2400-SiO2疏水光学薄膜

在惯性约束聚变(ICF)装置中大量使用具有变频特性的水溶性磷酸二氢钾(KDP)类晶体材料。在KDP晶体上镀制薄膜材料成为保护KDP晶体的有效措施。以正硅酸乙酯(TEOS)为原料,采用溶胶-凝胶法和提拉方式制备膜厚λ/4的增透膜,再采用具有高憎水特性、高透射率、低折射率的氟聚合物AF2400在FC-75的可溶解特性,在SiO2增透膜上旋涂AF2400防潮膜。对薄膜的表面形貌、疏水性能、光学性能和抗激光损伤阈值等进行了测试。结果显示,AF2400-SiO2复合光学薄膜表面平整,折射率为1.21,疏水角可以达到110°~120°,抗激光损伤阈值为19.5 J/cm2,是性能优良的疏水光学薄膜,可用于三倍频晶体KDP的保护。     

DiffServ中AF业务带宽分配公平性

通过在opnet6.0下进行计算机仿真实验及数据分析,研究Diffserv网络中AF业务类间和AF业务类里分别在欠载,过载情况下带宽分配的公平性问题,发现AF类间有较好的公平性,而在AF类里,受RTT,TCP连接数目,非响应流等因素的影响,并没有较好的带宽分配公平性。     

新型高合金二次硬化超高强度钢的发展

本文介绍了国外高Ｃｏ，Ｎｉ的超高强度钢ＨＹ１８０、ＡＦ１４１０和ＡｅｒＭｅｔ１００钢的进展，与其它超高强度钢相比，ＡｅｒＭｅｔ１００超高强度钢具有更突出的综合性能，高强度、高强度、高断裂韧性，优异的抗应力腐蚀开裂和抗疲劳性能，此钢具有广泛的应用前景。     

光控取向技术在塑料基板的应用

肉桂酸双酚A双酯旋涂于塑料基板,在线偏振紫外光作用下,发生光交联反应,诱导液晶定向排列,整个取向过程不需要对基板进行热处理。原子力显微镜对取向膜表面形貌观察得到表面具有较好的平整度。在偏光显微镜下旋转液晶盒,出现了鲜明的暗态和亮态。     

Effects of hydraulic retention time,temperature, and effluent recycling on efficiency of anaerobic filter in treating rural domestic wastewater

With rural population expansion and improvement of the socio-economic standard of living, treatment of rural domestic wastewater has rapidly become a major aspect of environmental concern. Selection of a suitable method for treatment of rural domestic wastewater depends on its efficiency, simplicity, and cost-effectiveness. This study investigated the effects of hydraulic retention time(HRT), temperature, and effluent recycling on the treatment efficiency of an anaerobic filter(AF) reactor. The first round of experimental operations was run for three months with HRTs of one, two, and three days, temperatures of 18℃, 21℃, and 24℃, and no effluent recycling. The second round of experimental operations was conducted for another three months with HRTs of three and four days; temperatures of 30.67℃, 30.57℃, and 26.91℃; and three effluent recycling ratios of 1:1, 1:2, and 2:1. The first round of operations showed removal rates of 32% to 44% for COD, 30% to 35% for TN, 32% to 36% for +4NH-N, 19% to 23% for 3NO-N-, and 12% to 22% for TP. In the second round of operations, the removal rates varied from 75% to 81% for COD, 35% to 41% for TN, 31% to 39% for +4NH-N, 30% to 34% for 3NO-N-, and 41% to 48% for TP. The average gas production rates were 6.72 L/d and 7.26 L/d for the first and second rounds of operations, respectively. The gas production rate increased in the second round of operations as a result of applied effluent recycling. The best removal efficiency was obtained for an optimum HRT of three days, a temperature of 30℃, and an effluent recycling ratio of 2:1. The results show that the removal efficiency of the AF reactor was affected by HRT, temperature, and effluent recycling.     

泡沫铝/聚氨酯复合材料摩擦阻尼器性能试验研究

基于泡沫铝/聚氨酯复合材料（aluminum foam/polyurethane,简称AF/PU）是一种同时具有铝材料的摩擦性能和聚氨酯的黏弹性的复合材料,由此研制出一种能够发挥黏弹性阻尼器和摩擦阻尼器各自耗能特点的泡沫铝/聚氨酯复合材料摩擦阻尼器（AF/PU摩擦阻尼器）,并对该阻尼器进行位移幅值、频率等相关性的性能试验和疲劳性能试验。以最大输出力、刚度和阻尼比为指标,研究该阻尼器的性能规律,采用修正的Bouc-Wen计算模型模拟其滞回曲线,并对比模拟结果和试验结果。研究结果表明：AF/PU摩擦阻尼器的滞回曲线饱满,具有较高且稳定的阻尼比。该阻尼器的力学性能随位移幅值和循环次数的增加而呈现分阶段性,但是加载频率的影响却较小,该阻尼器是一种典型位移幅值相关的变刚度摩擦阻尼器。修正的Bouc-Wen模型的模拟结果与试验结果二者吻合良好。     

酚醛型环氧树脂改性氰酸酯复合材料性能的研究

通过DSC分析,粘度、介电性能、力学性能及耐油性测试对酚醛型环氧树脂改性氰酸酯树脂复合材料的性能进行了研究。结果表明,改性氰酸酯树体系在70～160℃具有较低的粘度,理想工艺是在125～130℃下30～45min后开始加压;改性氰酸酯树脂表观活化能和反应级数分别为60.81kJ/mol和0.8846。改性氰酸酯复合材料具有良好的力学性能、介电性能和耐油性能。     

Synthesis and characterization of new aromatic polyesters containing pendent naphthyl units

Two bisphenols, viz., 4,4′‐[1‐(2‐naphthalenyl)ethylidene]bisphenol and 4,4′‐[1‐(2‐naphthalenyl) ethylidene]bis‐3‐methylphenol were prepared by condensation of commercially available 2‐acetonaphthanone with phenol and o‐cresol, respectively. A series of new aromatic polyesters containing pendent naphthyl units was synthesized by phase‐transfer‐catalyzed interfacial polycondensation of these bisphenols with isophthaloyl chloride, terephthaloyl chloride, and a mixture of isophthaloyl chloride/terephthaloyl chloride (50 : 50 mol %). Inherent viscosities of polyesters were in the range 0.83–1.76 dL g⁻¹, while number average molecular weights (M_n) were in the range 61,000–235,000 g mol⁻¹. Polyesters were readily soluble in organic solvents such as dichloromethane, chloroform, tetrahydrofuran, m‐cresol, pyridine, N,N‐dimethylformamide, N,N‐dimethylacetamide, and 1‐methyl‐2‐pyrrolidinone at room temperature. Tough, transparent, and flexible films were cast from a solution of polyesters in chloroform. X‐Ray diffraction measurements displayed a broad halo at 2θ ≅ 19° indicating the amorphous nature of polyesters. Glass transition temperatures of polyesters were in the range 209–259°C. The temperature at 10% weight loss (T₁₀), determined by TGA in nitrogen atmosphere, of polyesters was in the range 435–500°C indicating their good thermal stability. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

无线多跳通信系统中的一种改进方法

讨论了在无线多跳中继系统中使用双向传输流来提高频谱效率的方法,这种中继技术就是所谓的双向放大吞吐量的中继（BAT-relaying）。在BAT-relaying中前人提出两种方法：解码并转发BAT-relaying（DF BAT-relaying）和放大并转发BAT-relaying（AF BAT-relaying）。在AF BAT-relaying基础上提出了一种改进的方法,即在转发之前先去除噪声再发射,通过仿真分析得知这种方法可以更好的提高频谱效率。     

Estrogen Stimulates Proliferation and Differentiation of Neural Stem/Progenitor Cells through Different Signal Transduction Pathways

Our previous study indicated that both 17β-estradiol (E2), known to be an endogenous estrogen, and bisphenol A (BPA), known to be a xenoestrogen, could positively influence the proliferation or differentiation of neural stem/progenitor cells (NS/PCs). The aim of the present study was to identify the signal transduction pathways for estrogenic activities promoting proliferation and differentiation of NS/PCs via well known nuclear estrogen receptors (ERs) or putative membrane-associated ERs. NS/PCs were cultured from the telencephalon of 15-day-old rat embryos. In order to confirm the involvement of nuclear ERs for estrogenic activities, their specific antagonist, ICI-182,780, was used. The presence of putative membrane-associated ER was functionally examined as to whether E2 can activate rapid intracellular signaling mechanism. In order to confirm the involvement of membrane-associated ERs for estrogenic activities, a cell-impermeable E2, bovine serum albumin-conjugated E2 (E2-BSA) was used. We showed that E2 could rapidly activate extracellular signal-regulated kinases 1/2 (ERK 1/2), which was not inhibited by ICI-182,780. ICI-182,780 abrogated the stimulatory effect of these estrogens (E2 and BPA) on the proliferation of NS/PCs, but not their effect on the differentiation of the NS/PCs into oligodendroglia. Furthermore, E2-BSA mimicked the activity of differentiation from NS/PCs into oligodendroglia, but not the activity of proliferation. Our study suggests that (1) the estrogen induced proliferation of NS/PCs is mediated via nuclear ERs; (2) the oligodendroglial generation from NS/PCs is likely to be stimulated via putative membrane-associated ERs.