回转窑窑尾密封的安装技巧

以常见的迷宫式密封装置和径向接触式密封装置的安装为例,针对实际安装中遇到的问题进行了分析,提出了在筒体变形、偏摆和窜动的情况下,能够保证密封安装精度的安装要点和安装技巧。     

光纤通信中8B10B编码器的设计与实现

为了满足光纤通信系统中对线路编码的特殊要求,在深入分析现有8B/10B编码原理的基础上,提出了一种新的将同步块分组法与查找表法相结合的8B/10B编码方案。此方案的优势在于能在同一时钟下同步完成3B/4B编码和5B/6B编码,进而通过Disparity和Running Disparity这两个参数来控制编码后的4 bit数据和6 bit数据,使之结合为10 bit并行数据,最后通过串化器转化为高速的串行数据进行输出。整体设计方案用VHDL硬件语言实现了算法的描述,并在QuartusⅡ软件平台上实现了整个编码器的电路综合和波形仿真,结果表明该方案具有占用资源少、编码速度快、实时性好、可靠性高等优点,并且充分满足光纤通信中对高速数据传输的要求。     

利用比对试验的方法考核"DPC-1型底盘测功机"的精度

本文通过采用同一辆受试摩托车在三种不同摩托车底盘测功机上进行比对试验的方法，考核分析了天津大学科达测控技术公司研发的“DPC-1型底盘测功机”的测试数据的准确性和精度。     

一种直流力矩电机跑合防堵转控制电路

本文介绍了一种力矩电机跑合防堵转控制电路。作者对该电路的原理、使用和调试以及实验结果进行了描述。     

Vertical distribution of fauna in the bed sediment of three running water sites: Influence of physical and trophic factors

Relationships between invertebrates, substrate characteristics and trophic factors were investigated, with special emphasis on the hyporheic habitat, in order to characterize the functioning of different running waters ecosystems. Three contrasting study sites were chosen in catchments exhibiting different features: (1) a meandering reach of the Loire River in its alluvial floodplain, upstream of the ‘Bec d'Allier’; (2) a reach of the Galaure with a fairly developed riparian corridor, a small sinuous foothill river; and (3) a braided reach of the Drac, an alpine torrential stream. Each site was sampled once using the freezing-core technique with previous electro-positioning of the invertebrates. In each site, four 60 cm cores were extracted, each one from different morphodynamic units. In the Loire and Galaure rivers, most invertebrates are found in the first 15 cm of the sediment, with the exception of some particular taxa or morphodynamic units (riffle head). Conversely, in the Drac lotic units, maximum density of invertebrates occurs between 15 and 30 cm and more than 75 per cent of all organisms are found at a depth > 15 cm. The vertical distribution of organisms does not follow a uniform pattern in different streams. In the substrate, the vertical distribution of macroinvertebrates is very closely related to porosity in contrast with trophic parameters that always decrease with depth. The porosity is negatively correlated with the percentage of sand in the sediment and seems to be important in determining the vertical distribution of fauna, and should be integrated in a functional typology of running waters. The trophic parameters and the structure of invertebrate community with its dominant feeding groups allow discrimination of the different sites.     

Biomechanical and physiological comparison of conventional webbing and the M83 assault vest

This study compared the effect of load distribution using two different webbing designs on oxygen consumption and running kinematics of soldiers. It was hypothesised that running with webbing that distributes the load closer to the body (M83 Assault Vest) would expend less energy compared to running with conventional webbing (CON). Seven soldiers randomly completed three treadmill trials; an unloaded VO(2)max test, and two loaded (8 kg) efficiency tests using either the M83 or CON webbing. The VO(2)max test and the loaded efficiency tests had 4-min stages at 5, 8, 10 and 12 km h(-1). Energy expenditure was measured via indirect calorimetry and video analysis was used to determine stride frequency (SF) and stride length (SL) during each trial. Participants using the M83 webbing expended significantly (p<0.05) less energy at all four running velocities compared to the CON trials. The M83 webbing resulted in smaller changes to SL and SF from the unloaded trial when compared to the CON trial. These results indicate that the M83 vest that is designed to distribute the load closer to the body may have an energy efficiency advantage over conventional webbing when soldiers are running.     

热回收系统在酒店工程中的应用分析

针对某酒店空调工程的特点选择了热回收空调方案，介绍了该系统的设备选型及运行管理方法，并与传统中央空调加锅炉方案进行了经济性比较，证明热回收空调系统能降低运行成本，取得良好的经济效益。     

链条炉燃用强结渣性煤的设计及运行

通过介绍强结渣性煤链条炉的设计要点及运行特点,以求扩宽链条炉的使用范围,在用户燃用强结渣性煤时多一种选择。     

小型水轮发电机组优化运行系统的设计与实现

介绍了小型水轮发电机组优化运行系统的设计原理、水轮发电机组的效率测定与计算方法，阐述了系统的硬件体系结构、DSP系统的软硬件设计及主控计算机方的软件设计。该系统涉及到数据转换与传输、非线性回归、新型DSP系统设计、实时性设计、面向对象软件设计等方面的技术应用，系统具有较好的稳定性、可维护性及友好的界面。