大初拉力圆柱形螺旋弹簧的反变形设计原理

本文依据反变形设计原理,指出提高圆柱形螺旋弹簧初拉力的途径及实施办法。这项技术简单实用,解决了提高弹簧初拉力的困难。按照反变形原理制做的弹簧初拉力可以增加若干倍     

机器结构声发射的表征:自由速度和导纳的测量

本文对机器结构声发射的表征作了实验研究.所推荐的源描述符要求对机器与支撑结构的接触点的自由速度作测量,同时对机器的源导纳作测量或估算.本文对平动和转动的速度测量作了讨论,对力和力矩导纳的测量也作了描述.对一个机器家族——为建筑物服务的离心风扇,在三个自由度、多支撑点上的源描述符进行了评价.数据的表示作了简化.从而使得同类型的机器和一个机器中不同振动分量间可以作比较.在所研究的机器中,似乎在低频区垂直力分量引起的发射占主要.然而力矩的贡献却随着频率的增加,其相对重要性也增加,可能在高频区会占据主要地位.     

活性碳纤维的制备及其吸附性

耐熔性沥清基纤维经过碳化处理后,在一定温度下的CO_2气流中进行活化处理,得到的活性碳纤维具有良好的吸附性和再生性。     

控制阴极电势电积法新工艺及其应用

研究了控制阴极电势电积法的反应机理、工艺流程及应用情况．运用该新工艺电积时不析出氢气和砷化氢气体．通过控制阴极电势电积法、间断电积法、连续电积法各项参数的比较，该新工艺具有电流效率和工作效率高、能耗低、脱杂能力强等一系列优点．工业生产应用试验证实：该新工艺可控性强，安全可靠，操作简便，具有较大的经济效益和社会效益．     

内蒙古轮藻植物数量分类

用欧氏距离—组平均法对内蒙古轮藻植物进行聚类分析,其分类结果与传统分类方法基本一致,说明轮藻植物分类系统中族、组、系的分类等级设置合理,可反映轮藻植物的亲缘关系.     

Low complexity power control approach based on MMSE detection for V-BLAST

1. INTRODUCTION Layered Space-Time (LST) architecture offers a great increase in capacity, promising a linear growth with the size of the antenna array under some circumst- ances[1,2]. In recent years, Vertical Bell Lab Layered Space-Time (V-BLAST), one of the most important LST architectures, has been a hotspot in mobile com- munication because of its simple architecture and high spectral efficiency [3]. There have been some effective Per-Antenna Po- wer Control (PAPC) algorit…     

Microsomal glutathione S-transferases: selective up-regulation of leukotriene C4 synthase during lipopolysaccharide-induced pyresis

Cysteinyl-leukotrienes (cys-LTs) are potent smooth muscle contracting agents, which play key roles in inflammatory and allergic diseases. The committed step in cys-LT biosynthesis is catalyzed by leukotriene C₄ synthase (LTC4S) as well as microsomal glutathione S-transferase type 2 (MGST2) and type 3 (MGST3). Here we report that intraperitoneal injections of lipopolysaccharide in rats lead to a strong increase of LTC4S messenger RNA (mRNA) levels after approximately 1 h, particularly in the heart, brain, adrenal glands and liver, without any significant effect on MGST2 and MGST3 mRNA levels. After 6 h, LTC4S mRNA returns to basal levels, concomitant with a 4.9-, 4.0-, 2.9- and 2.3-fold induction of LTC4S protein in brain, heart, liver and adrenal gland, respectively. Hence, challenge with lipopolysaccharide in vivo causes an organ-selective, local priming for leukotriene C₄ synthesis. Moreover, these data suggest that LTC4S and cys-LTs may be involved in acute systemic inflammatory responses such as fever and tachycardia.Received 12 August 2004; received after revision 27 October 2004; accepted 1 November 2004     

采煤机滚筒截割记忆程控误差的灰预测

根据采煤工作面设备配套条件和采煤机工作循环特点,分析了记忆程控滚筒调高的采样、控制环节误差产生的原因,论述了可靠预测采样控制的精度及误差的修正,以再现上一截割循环顶底板的变化序列曲线.通过对正弦函数型的参考序列曲线和比较序列曲线关联度计算分析,研究了灰预测关联度的几种方法特征,给出了适合采煤机滚筒记忆程控特点的关联度预测方法,满足记忆程控的指令宏观再现控制要求.