车用柴油机冷EGR系统的试验研究

冷EGR技术不仅可以有效降低NOx排放，而且有助于减少因柴油机采用EGR引起的微粒排放量的增加。本文进行了车用柴油机冷EGR系统的试验，研究了冷EGR对柴油机排放性能的影响。并且，对冷EGR和喷油延迟这两种降低柴油机NOx排放措施进行比较。     

论中外企业文化的绩效考核差异

一、企业文化理论概述 企业是有民族性的,任何民族都有自己特定的文化,任何企业都会受到本民族文化的影响,形成自己特定的企业文化.     

Using the implantable electrical stimulator for peripheral nerve rehabilitation: A study in an animal model

The present study presents a peripheral nerve injury animal model for evaluation of an implantable electrical stimulator we designed. The evaluation was confirmed by ethological, electrophysiological and histologic study. Twenty New Zealand rabbits were used. The left sciatic nerve was crushed with a micro-vessel clamp in all rabbits, and the stimulators were implanted in ten rabbits. The other ten rabbits were in a control group. As compared with the implantation group, 3 and 6 weeks after operation, the histology showed the typical pathologic atrophy by hematoxylin-eosin (HE), the motor nerve conduction velocity (MCV) was found significantly slowed and the axon of crushed nerve at distal portion exhibited breakdown in the control group. These results reveal that the implantable electrical stimulator was effective and was suitable for implantation in an animal model.     

如何构建绩效考核体系

绩效考核具有悠久的历史,古今中外都有许多关于人员考核的记载。十六国时期,前秦皇帝苻坚召见高泰,问及治理国家的根本要点,高泰答曰：“治本在得人,得人在慎举,慎举在核真,未有官得其人而国家不治者也”。可见古人对考核就有深刻的认识,当今世界各国政府和企业对人员绩效考核越来越重视。例如,据日本经营者联盟所做的调查,1968年日本实行员工考核的企业占全部企业的87．1％,到1974年已上升到96．5％,而拥有1000名以上职工的大企业,100％都实行员工考核。     

A Hemodynamic Study of the Effect of Neuromuscular Electrical Stimulation on Enhancing Popliteal Venous Flow

Neuromuscular electrical stimulation has been studied to be a method of prophylaxis for deep venous thrombosis by activating the calf muscle pump. However, there is little evidence of the effects of different stimulating parameters on hemodynamics and comfort levels. The objective of this paper is to compare the effects of different stimulating parameters(current amplitude, pulse-width) on hemodynamic alterations of the popliteal vein and the comfort levels in a group of fourteen healthy subjects. Doppler ultrasound detection of peak venous velocity and blood volume were taken from baseline, twelve sequential electrical stimulations and foot dorsiflexion for each subject. A visual analogue scale was used to assess the subjects' pain perception of neuromuscular electrical stimulation. The results showed that peak venous velocity and blood volume augmented as current amplitude and pulse-width increased while pain level also increased. A compromise was reached that parameters consisting of an amplitude of 10 m A and a pulse-width of 500 μs would obtain a high-peak venous velocity and blood flow volume with a relatively comfortable perception. In addition, parameters consisting of an amplitude of 20 m A and a pulse-width of 300 μs were also shown to be a promising choice. However, further studies need to be done to validate and enrich these findings.