高精度碳纤维复合材料天线的研制

本文通过研究中温固化树脂基体、复合材料（FRP）铺层、成型及模具材料和模具设计等，研究并批生产了高精度碳纤维复合材料（CFRP）天线，其精度达到了0.031-0.057mmr.m.s。     

高精度碳纤维复合材料天线的研制

本文通过研究中温固化树脂基体、复合材料（FRP）铺层、成型及模具材料和模具设计等，研究并批生产了高精度碳纤维复合材料（CFRP）天线，其精度达到了0．031－0．057mmr.m.s。     

氢氧化铝在阻燃型风力发电机机舱罩中的研究与运用

在阻燃型玻璃钢复合材料结构件的制作中,不同氢氧化铝(ATH)含量对用于真空辅助树脂传递模塑技术(VAR-TM)的不饱和聚酯树脂的工艺性能、成型后材料的阻燃性能及力学性能有显著影响。本文通过测试观察不同氢氧化铝含量对树脂粘度、固化性能、浇铸体极限氧指数、纤维增强复合材料(FRP)的弯曲性能和巴柯尔硬度的影响。结果显示,当ATH添加量为35%时,树脂粘度和浸润速度都适合VARTM工艺,并且FRP有一定的阻燃、抑烟效果,同时力学性能也满足使用要求。     

双马来酰亚胺树脂固化技术及反应机理研究进展

双马来酰亚胺树脂是一种高性能热固性树脂,在尖端技术领域有着广泛的应用。本文综述了双马来酰亚胺树脂(BMI)在热、微波辐射、电子束辐射和紫外光等作用下固化成型技术及固化机理等方面的研究进展。     

真空辅助树脂灌注配套基体树脂的制备及性能

针对真空辅助成型技术(VARI)对基体树脂的特殊要求,结合航空材料对性能的高要求,研制了BA9912中温固化环氧树脂体系。采用VARI工艺制备了G0827/BA9912复合材料,测试了BA9912树脂浇注料及其复合材料的力学性能和耐热性能,并与国内外同类树脂进行了适当的比较分析。分析测试结果表明,BA9912树脂具有良好的力学性能、耐热性能和工艺性能,能够满足VARI成型工艺要求,适合在航空航天领域中应用。     

热塑性树脂基复合材料激光原位固化研究进展

鉴于热塑性树脂基复合材料激光原位固化技术在武器装备制造领域的巨大应用前景,为促进激光原位固化复合材料成型技术发展,本文在对激光原位固化成型技术进行国内外的研究和应用总结基础上,对激光原位固化过程所涉及的机理进行了讨论,对激光原位固化实验研究进行了总结,对固化过程中的温度场仿真进行了论述,同时对该技术在航空航天领域的发展和研究方向进行了探讨。从机理研究、固化实验和温度场模拟3个方面对热塑性树脂基复合材料激光原位固化成型技术国内外的研究和应用情况进行回顾和总结,并探讨了激光原位固化技术的最新发展趋势。     

中温固化树脂基体的研究

MED—1树脂基体基本能满足中温固化成型工艺要求。浇注体具有较高的拉伸强度,优异的抗断裂韧性。该基体与E—玻璃纤维、碳纤维等增强材料粘接性好,复合材料成型工艺简便;单向复合材料的力学性能、热强度保持率及湿热强度保持率都比较高。     

新型拉挤酚醛树脂及其复合材料的性能研究

以牌号为F-613的非酸固化型拉挤酚醛树脂为研究对象,通过FTIR、GPC、流变仪、DSC等表征方法分析了该树脂的结构、分子量、粘度特性、固化特性、凝胶时间等。结果表明,该树脂的DSC曲线显示具有单一的固化峰,且固化峰温度较低,此外,高温下的凝胶时间较短,固化度较高,能够很好地满足低粘度、高活性、快速固化等拉挤工艺要求,并且工艺配方与成型工艺简单,由其所制备的复合材料与9450酚醛树脂的复合材料性能基本相当。     

挤拉模具系统概要

挤拉模具系统由在挤拉法生产FRP产品的过程中所须使用的预成型装置和成型模具两部分组成。其作用是使增强材料按照预定的配置形式与基材树脂固化形成具有特定形状和尺寸的FRP产品。在基材树脂系统配方恰     

树脂基复合材料成型工艺的发展

树脂基复合材料具有质轻、力学性能优异等优点,在航天航空等领域逐步取代金属成为主要结构制件,并在民用领域得到了快速的发展．本文着重介绍树脂基复合材料的优点,缠绕、拉挤、液体模塑成型工艺的发展以及树脂体系固化工艺。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、环氧树脂、不饱和聚酯树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。