The properties of product : extremely high wear - resisting performance , an extremely low cofficion ; fine person who lubricate by oneself , it si unnecessary the note oil , use the difficult card to die under the abominable condition ; antistatic , it is fire - retardant to resist , ageing - resistant , able to bear the corrosion of chemistry ( sour alkali and organic solvent ) ; can bear and assault , shake repeatedly ; mechanical performance is excellent , light , install it conveniently 产品性能：极高的耐磨性能，极低的摩擦系数，优良的自润滑性，不用注油，在恶劣条件下使用不易卡死；具有抗静电，抗阻燃，耐老化，耐化学（酸、碱和有机溶剂）的腐蚀；能承受反复冲击、震动；机械性能优异，重量轻，安装方便。
Supposing chaotic ds - spread spectrum signal bandwidth is equal to the fh slot spacing , the bit error rate formula is derived , and its performance is evaluated and simulated assuming the worst case of jamming strategy . the results show that , in some cases , the addition of chaotic ds spreading to fh system , without increasing total system bandwidth , can improve significantly the system ' s resistance to partial band multitone jamming 对最恶劣条件下系统的抗干扰性能进行了仿真研究，结果表明，在某些情况下，在慢跳频系统中，加入混饨直扩成分，即使不增加系统带宽也能有效地改善系统对抗部分频带多频干扰的能力。
With the quick boom of economy and the rapid development of construction , modem buildings call for better and better material than before . steel tube confined concrete ( stcc ) has been applied in building widely and has acquired economic benefit largely for its excellent quality in structure of big span , height , and loads , good quality of behavior in bad environment , fine gift in industrialization produce . so , it " s a good material of building 钢管混凝土能够适应现代工程结构向大跨、高耸、重载发展并满足承受恶劣条件的需要，符合现代施工技术工业化要求；而且具有承载高、塑性和韧性好、施工方便、耐火性能和经济高效等优点；因而正被越来越广泛地应用于土木工程中；并已取得良好的经济效益和建筑效果，是结构工程科学的一个重要发展方向；有着广阔的应用前景。
The condition monitor system adopt hiberarchy , it was composed of head computer , monitor computer , periphery board and some circuit , the system can work in three different mode accord the different condition , the monitor computer and periphery board use the pc / 104 embedded module to make the system have the strong anti - vibratility and high ability of real time disposal ; in the system , we adopt the self - examination , redundancy design and some measures of software and hardware anti - jamming to make the system have strong ability of anti - jamming and high reliability , those all make the system adapt the worst work condition of the engine and realize the real time monitor of engine condition 该状态监测系统采用了分级结构，由上位机、下位机、外围卡板和各种电路组成，可以根据不同情况在三种方式下工作。在下位机和外围卡板的设计中采用了pc 104嵌入式模块，使得系统具有较强的抗震性和实时处理能力；在整个系统中还采用了软硬件抗干扰措施，并进行了自检系统和冗余结构的设计，使得系统具有较强的抗干扰能力和较高的可靠性，经过这些设计，使系统可以适应发动机运行过程中的恶劣条件，实现对发动机状态的实时监测。
