奥托昆普的浮选理论研究与实践

本文在简要回顾了动态效益概念发展历程基础上，较全面地介绍了国内外有关抽水蓄能电站动态效益的研究现状，重点评述了该效益的定量化评价方法，并对该领域的发展趋势进行了初步探讨，提出；系统化、高精度是蓄能电站动态效益定量评价研究的发展方向。     

成形磁带盒存放架的注射模

1.塑件的原理及功能用耐冲击聚苯乙烯成形正方形磁带盒存放架。一些磁带盒能互相堆叠并用搭锁联接,增加了存放磁带盒的容量。塑件的基本尺寸为162×162×110(mm)。其中间是一正方形空管,两端用两块正方形板固定。侧壁固定在两板之间,平行于中间的空管,形成四个装磁带的空间。当磁带有外罩盒时,它能水平地放入磁带盒存放架中;当磁带没有外罩盒时,它能垂直地放入磁带盒存放架中。磁带盒存放架侧壁上的筋使磁带牢固地固定于它们所在位置上。舌     

丰富多彩的亚洲卫星电信市场

随着移动电视在美国的开始应用,新应用逐渐站稳了脚跟,并被美国消费者的要求所推动,而消费者的这些更丰富体验的要求在以前受到过抑制。为了在卫星电信领域更好契合这一趋势,注意亚洲发展并从其经验中总结教训这一做法是有意义的。     

A technique for assessment of torso kinesiology

A technique is described for monitoring and analysis of the angular displacement of the human torso. The technique is based on the use of miniature electromechanical inclinometers and video recording. The system was developed for continuous measurement of the angular displacement of spinal segments in the sagittal plane during all stages of lifting. Angular displacements of the cervical, thoracic and lumbar regions were obtained from a dynamic lifting case study using a digital processing system. The geometrical changes of the torso during five prescribed stages were measured. The system revealed good accuracy with high correlation coefficient scores for a wide range of lifting tasks in a comparative laboratory study. This paper describes the monitoring technique; the system's advantages, disadvantages and measuring accuracy are discussed.     

Frequency- and depth-dependent compensation of ultrasonic signals

The resolution in ultrasonic images decreases with depth when using traditional time-gain compensation (TGC) of the received signal. To reduce this effect, both frequency-dependent and depth-dependent compensation is introduced. A time-varying digital filtering method is presented for this purpose, which is based on Wiener filtering. Images obtained from a simulated tissue equivalent are presented and the frequency-compensated images are compared to conventional TGC-compensated images. It is shown that the improvement in resolution using frequency-dependent compensation is considerable when the signal-to-noise ratio in the received signal is high.