空间斯特林制冷机失效分析

针对空间用的"牛津型"斯特林制冷机的结构特点,对其早期失效模式和正常失效模式等主要失效模式进行了较深入分析,提出了改进措施.通过结构设计、工艺等改进,可以消除早期失效模式、延长正常失效的时间.     

Research on microstructure and catalysis effects on hydrogen storage alloy of nanosized three ions co-doped Ce1−3xCuxFexZnxO2

Ce_1−3xCu _xFe _xZn _xO₂ nano-particles were synthesized by hydrothermal method. The micro-structure, spectra features and catalysis effects on hydrogen storage alloy of Ce_1−3xCu _xFe _xZn _xO₂ were studied. It was researched that the dopants were inserted into the lattice of CeO₂ and the solid solubility x was identified as 0.05. The oxygen vacancies contents and degree of lattice distortion were improved, and the band gap energies were decreased. The hydrogen absorption/desorption kinetics of Mg₆₀La₁₀Ni₂₀-5 mol%Ce_1−3xCu _xFe _xZn _xO₂ composites were evaluated. The results showed that the catalysts effects were improved by enhancing the doped concentrations. The catalysis mechanism was related with the microstructure and micro-electronic structure of the catalysts.     

Pharmacologically induced elements of the hunting and feeding behavior in the pteropod mollusk Clione limacina. II. Effects of physostigmine

1. A contact of the pteropod mollusk Clione limacina with its prey (small pteropod mollusk Limacina helicina) evokes a complex pattern of hunting and feeding behavior: protraction of tentacles to seize the prey, activation of buccal apparatus to swallow the prey, activation of locomotor system (speeding up of wing beating), reversal of reaction to tactile stimulation of the head, loss of normal (vertical) orientation in space, and swimming in circles. After injection of physostigmine (PhS), the acetylcholinesterase inhibitor, into the hemocoel of intact Clione, all these manifestations of the hunting and feeding behavior could be evoked by tactile stimulation of the head, or they arose spontaneously. 2. In the preparation of the isolated CNS, the effect of PhS on the neural networks controlling different aspects of the hunting and feeding behavior was studied by recording from neurons monitoring activity of different networks (< or = 4 neurons simultaneously). Tactile stimulation of the head was mimicked by a short-term electrical stimulation of the corresponding nerve. Before PhS application, the nerve stimulation evoked elements of the defense reaction, i.e., long-lasting inhibition of all main motor control systems: the locomotor network in the pedal ganglia, the tentacle control network in the cerebral ganglia, and the network controlling radula and hook movements in the buccal ganglia. However, after PhS application, the same stimulus evoked a long-lasting bout of excitation in all the three networks accompanied by activation of the heart-exciting neuron as well as by a modification of the activity of statocyst receptor cells controlling Clione's spatial orientation (the "fictive hunting bout"). Similar hunting bouts could arise spontaneously. 3. Injection of acetylcholine (ACh) into the hemocoel of intact Clione was less effective than injection of PhS. After ACh injection, reversal of reaction to head stimulation was observed in < or = 20% of the experiments (the percentage of positive results was higher if ACh was injected into the head just over the CNS). Bath application of ACh to the isolated CNS did not produce the hunting bouts. However, a short-term local application of ACh to the cerebral ganglia in the isolated CNS resulted in activation of the main motor systems controlling locomotion, protraction of tentacles, and movements of buccal mass. 4. During spontaneous PhS-induced bouts, excitation of different networks involved in hunting behavior was sometimes not quite synchronous. Different networks could be excited in variable order over a period of up to several seconds.(ABSTRACT TRUNCATED AT 400 WORDS)     

现代设计理念在中国陶瓷产品设计中重要性

中国的陶瓷产量居世界第一,但中国陶瓷产品的设计依然与世界先进水平有很大差距,现代设计理念在我国陶瓷产品的设计中还很缺乏。陶瓷产品作为现代大工业生产的一部分,理应在设计中贯穿现代设计理念。现代设计理念在陶瓷产品设计中的重要性应体现在功用理念、文化与审美理念、人本理念和市场理念等几个方面。     

鲜湿面保鲜的研究与探讨

研究了几种天然防腐保鲜剂:乳酸链球菌素、溶菌霉等在延长鲜湿面保质期上的效果,并根据多种保鲜剂及辅助剂的互补增效作用,研究出了一种非常高效的复合天然食品保鲜剂(TKB06)。它可以大大延缓鲜湿面的微生物腐败变质,使鲜湿面保质期达到12月以上。     

含偶氮苯结构树枝状化合物的合成与表征

以间二苯甲酸为原料,经多步反应合成5-[4-（羟乙氧基苯基）偶氮]-1,3-苯二甲酸;进一步与均苯三甲酰氯反应得到新型含偶氮苯结构树枝状化合物,通过FT—IR、UV—vis和。HNMR对中间体及树枝状产物进行了结构表征。TGA分析显示,5％失重温度为225℃,DSC测得树枝状化合物的玻璃化转变温度（嗜）为95．7℃。     

新型耐油胶布的研制

以NBR/CSM为外层胶、NBR/CHR为内层胶、尼龙纤维为骨架材料且内层胶表面贴合聚四氟乙烯薄膜,研制了新型耐油胶布制品。实验证明,该制品能较好地满足贮（运）油类燃料的要求,满足用户需求。     

花生壳对含Cr（Ⅵ）废水的吸附试验研究

通过对花生壳吸附溶液中六价铬Cr（Ⅵ）的试验研究,探讨了影响其吸附能力的各种因素,包括溶液的pH值、温度、吸附时间、吸附剂投加量等,分析各因素对吸附能力的影响结果。并通过正交试验确定各影响因素的主次关系,即对吸附能力的影响程度,找出最佳的吸附条件。试验结果表明,当废水中Cr（Ⅵ）浓度为30 mg/L,投加1 g花生壳入50 mg/L废水中,调节溶液的pH值为2.0,在室温下吸附300 min,Cr（Ⅵ）去除率可达85%以上。     

4000 m~3液化石油气球罐分析设计讨论

通过压力容器分析设计的方法,使用数值分析的方式,对球形储罐的应力分析进行了论述,对其结构、载荷等问题进行了说明,为球罐分析设计提供了可供工程参照的方法。并对4 000 m~3,振动按双质点考虑的大型球罐的地震工况进行了讨论,对球罐这种剪切型振动只考虑水平地震。通过ANSYS有限元软件建模分析,得出各种工况下球罐的应力和变形。