SB70变频器在锌带收卷控制上的应用

本文介绍了如何使用森兰SB70系列高性能矢量控制变频器的转矩限幅功能实现锌带无张力传感器的收卷控制。     

霜层生长过程的神经网络仿真模型研究

利用神经网络的强非线性映射能力，对已公开发表的实验数据作了结霜过程的智能化仿真研究。     

大洋钻探天然气水合物储层测井评价研究进展

国际科学大洋钻探计划自1970年首次在布莱克海脊钻遇天然气水合物（以下简称水合物）以来，迄今已在全球三大洋（太平洋、大西洋、印度洋）的大陆边缘总共53个站位钻遇了水合物，采集了大量的地球物理测井资料，为理解水合物及其宿主沉积物原位特性提供了关键信息。水合物所具有的不导电、低密度、高声波速度、高含氢量等特性，为根据测井资料识别水合物并预测其分布提供了重要的依据。目前已提出的一系列根据测井资料估算水合物饱和度的方法，主要包括阿尔奇公式、密度—核磁共振测井联合、各种形式的三相声波方程以及基于不同岩石物理模型的弹性波速度模拟等方法。海底水合物具有明显的非均质分布特性，主要表现在水合物分布对宿主沉积物岩性的选择性以及在相同岩性宿主沉积物内部对成核部位的选择性上。尽管测井资料在评价水合物分布的非均质性、推断水合物生长习性方面已经得到了初步应用，但仍然存在着一些不足：①大洋钻探水合物测井解释中所依赖的地层模型还是过于简单，大多数都是两组分或三组分模型；②高分辨率随钻测井资料的应用还很有限；③测井解释与岩心地质研究的结合还不够紧密。结论认为，将水合物与宿主沉积物视为一个整体，基于更为复杂的地层模型，在岩心标定的基础上，依据多种高分辨率随钻测井资料，联合反演地层的岩性组分、孔隙度和水合物饱和度，或许是未来水合物储层测井评价发展的一个重要方向。     

浅谈综合性工程咨询单位发展思路

面对事业单位改革的新形势，我们就综合性工程咨询单位如何明确定位，增强实力，谋求更大发展，有以下几点思路。 一、以市场为主体，坚持自主创新 面对国际国内经济社会的大趋势，综合性工程咨询单位要想在以信息化为标志的新科技革命大潮中发展，必须在思想上、运行机制上、管理方法上、服务态度上来一个突破性的转变，明确只有创新，才能适应市场经济的需求；明确只有准确定位，自身才能得到发展。     

快速发酵黄酒酵母菌的筛选

以淋饭酒母为菌种来源,通过TTC法、CO2失重法以及酿酒试验,筛选出一株快速发酵黄酒酵母菌GY-9。以GY-9酵母酿制机械化黄酒,能提高成品酒的酒精度、缩短发酵周期。经分子鉴定,GY-9为酿酒酵母菌。     

HPLC测定微波干燥丹参药材中丹参酮Ⅰ和丹参酮ⅡA的含量

本文采用微波干燥丹参药材,用HPLC方法测定了微波干燥对丹参药材中丹参酮Ⅰ和丹参酮ⅡA等主要有效化学成分含量的影响.结果表明,与常规干燥方法相比,微波干燥丹参药材速度快,效率高,物理外观质量更好,但丹参酮Ⅰ和丹参酮ⅡA的含量低于阴干和晒干法,采用低于60℃控温微波间歇辐射干燥方式可有效保持丹参酮Ⅰ和丹参酮ⅡA含量.     

HPLC测定微波干燥丹参药材中丹参酮I和丹参酮IIA的含量

本文采用微波干燥丹参药材,用HPLC方法测定了微波干燥对丹参药材中丹参嗣I和丹参酮IIA等主要有效化学成分含量的影响。结果表明,与常规干燥方法相比,微波干燥丹参药材速度快,效率高,物理外观质量更好,但丹参酮I和丹参酮IIA的含量低于阴干和晒干法,采用低于60℃控温微波间歇辐射干燥方式可有效保持丹参酮I和丹参酮IIA含量。     

Antioxidant properties of Chinese yellow wine, its concentrate and volatiles

Yellow wine (YW) has been claimed to have beneficial effects on the prevention of cancer and cardiovascular disease, which are related to the oxidation activity in vivo. In this study, the antioxidant activity of YW and its concentrate and volatile compounds (VC) was determined in terms of total antioxidant, reducing capacity, free radical scavenging, metal chelating and superoxide anion radical scavenging activities. These various antioxidant activities were compared with synthetic antioxidant, such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). The total phenolic compounds were also determined. Results indicated that YW and its concentrate exhibited similar strong total antioxidant activity. The inhibition percentage of 100 μl of YW and its concentrate on peroxidation of 2.5 ml of linoleic acid emulsion was 97.99% and 95.74%, and both of them also had effective reducing capacity, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging and superoxide anion radical scavenging activities, but had very low metal chelating activity on ferrous. However, the VC in YW had little antioxidant activities. Results indicated that active antioxidants were nonvolatile and resided in the concentrate after evaporation. Phenolic compounds may play a very important role in the antioxidant function. However, identification of specific antioxidant components should be further investigated.     

半导体制冷技术的发展与应用

不同于传统的制冷,半导体制冷可以打破常规,强行将被制冷物体的温度降到比环境温度还低。其实现的原理即强行打破热平衡,实现温差效果。只要充分处理好制冷片热端的散热,即可达到理想的制冷效果。     

A Colorimetric Artificial Olfactory System for Airborne Improvised Explosive Identification

The detection of ultralow or nonvolatile target analytes remains a significant challenge for artificial olfactory systems even after decades of development, which severely limits their widespread application. To overcome this challenge, an artificial olfactory system based on a colorimetric hydrogel array is constructed for the first time as a universal representative. As an effective extension of conventional artificial olfactory systems that integrates the merits of its predecessors, the proposed system accurately mimics olfactory mucosa and specific odorant binding proteins using hydrogels endowed with specific colorimetric reagents for the detection of hypochlorite, chlorate, perchlorate, urea, and nitrate. Therefore, the proposed system is capable of detecting and discriminating between these five airborne improvised explosive microparticulates with a detection limit as low as 39.4 pg. Additionally, the system demonstrates good reusability over ten cycles, rapid response time of ≈0.2 s, and excellent discrimination properties, despite significant variation. This proof-of-concept study on colorimetric artificial olfactory systems yields a novel strategy for the direct and discriminative detection of nonvolatile airborne microparticulates.