高强度阻燃整体带芯的研制及应用

介绍高强度阻燃整体带芯的设计及在高强度阻燃整芯输送带中的应用。带芯经纬向受力线采用锦纶工业长丝。覆盖棉采用833dtex或583dtex棉纱。浸渍糊主体采用PSM31树脂，并配以适量无机阻燃剂（三氧化二锑／氧氧化铝／硼酸锌）、增塑剂（DOP／氯化石蜡）、阻燃增塑剂[三芳基磷酸酯／磷酸三（β-氧乙）酯]和稀土稳定剂等。采用该带芯及浸渍糊，利用无抽真空装置的浸塑设备生产的高强度整芯阻燃输送带性能符合MT914-2002要求。     

纯生啤酒的微生物检测

目前我国的纯生啤酒已有一定的市场规模。在生产熟啤酒时,酿造中出现的微生物污染问题往往被许多啤酒生产厂家忽视,但是在纯生啤的生产中,显得尤其重要。结合国外的先进经验和工厂的实际,总结出了一套适合中国国情的纯生啤酒微生物检测,已在国内两条纯生啤酒生产线的投产上起到了作用。     

433MHz ASK接收机中低噪声放大器的设计

采用UMC 0.18 μm 标准CMOS工艺设计了一款433 MHz ASK接收机中的LNA电路,采用差分带源极负反馈的共源共栅结构,实现单输入双输出,与混频器级联时,避免了使用外接平衡转换器.测试结果表明,该放大器的噪声系数为1.65 dB,增益则达到了18.2 dB,因此将很大程度上提高了整个接收机的噪声性能.同时输入输出匹配分别达到了-28 dB和-24 dB,IIP3也达到了-9.8 dBm,在1.8 V 的电源电压下,功耗为6.5 mW.芯片的尺寸为0.6 mm×0.9 mm.     

LNG常压储罐预冷热力分析

对LNG常压储罐预冷进行热力分析,得到定压下LNG储罐液氮质量流量与储罐温度的关系、预冷时间与储罐温度的关系,探讨了LNG储罐实际预冷过程控制.     

Identification of Anamorph Yeast of Tremella aurantialba and Optimization of Medium Composition for Production of Exopolysaccharides

A yeast-like fungus strain B1 isolated from wild fungus Tremella aurantialba was identified and initially characterized. Two phylogenetic trees were generated based on the sequences of large subunit ribosomal RNA gene D1/D2 regions and internal transcribed spacer (ITS) regions of related fungi, respectively. The analysis of D1/D2 regions and ITS sequences showed that fungus B1 was clustered together with T. aurantialba, T. aurantia and T. microspore in the phylogenetic trees. Both the morphological characteristic and phylogenetic analysis established that fungus B1 was one of the anamorph strains of T. aurantialba and belongs to Tremella genus. A fermentation medium for exopolysaccharides (EPS) production by T. aurantialba B1. Plackett-Burmen design was used to evaluate the effects of different components in the culture medium. Glucose and yeast extract have significant influence on the EPS production. The concentrations of two factors were optimized subsequently using central composite design and response surface analysis. The results showed that 49.2 g/L glucose and 10.4 g/L yeast extract could lead to the maximum production of EPS (4.99 g/L). The optimized medium led to a 1.5-fold enhancement of the production of EPS by T. aurantialba B1, as compared with that without optimization.     

酶法合成类可可脂研究进展

全球市场对类可可脂需求不断增长,加速对酶法合成类可可脂技术研究与应用.该文概述影响酶法合成类可可脂因素及合成技术研究进展,并对国内外酶法合成类可可脂发展方向及未来市场进行展望.     

螺栓球节点网架屋盖在海外体育场工程中的应用

加纳共和国体育场屋盖应用了施工方法简单的螺栓球节点网架结构,取得了一定的社会和经济效益。叙述了海外体育场工程因地制宜拟定屋盖的选型、施工方法、质量控制及测量方法,对类似的工程有一定的借鉴作用。