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记得前些年,人们在买车时总会先问问要买车带不带ESP,好像有了它,自身安全性标准就会高上一筹。现在随着成本的下降和技术的成熟,车身电子稳定系统已经渐渐普及,成为越来越多车型的标配,而在欧美许多国家,政府已经强制汽车生产厂家配备这种系统,否则将无法上市销售。这么多车装了车身稳定系统,足以说明其作用之重要,但它是如何工作的,对汽车安全到底能起多大影响呢? 相似文献
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本文结合实际,论证了稳定无论对于创造企业的社会环境,还是对于一个地区企业的发展和祖国改革振兴的大业来说,都是无价的,稳定工作是一个不容忽视的生产力。 相似文献
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At their recent meeting in Washington the Group of Seven reafirmed their desire to hold exchange rates at about their current level. In this Viewpoint we consider the prospects for success. We conclude that although current rates are feasible in terms of competitiveness, the system will remain under strain as long as there are major inconsistencies between jiscal policy in the US and the rest of the world. The present conjuncture of interest rates and inflation points to a further dollar depreciation. It would be better, in our view, to enact this quickly and to attempt to stabilize exchange rates at sustainable levels: the policy of holding the dollar is misguided. 相似文献
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A bstract There has recently been a great deal of interest in the question of whether job stability has declined in the United States. However, a satisfactory answer to this question has not been agreed upon. In this article, data from the Panel Study of Income Dynamics (PSID) are examined to bring new evidence to bear on the subject of job stability trends. Using these data, job retention rates for various groups of workers between 1976 and 1992 are calculated. Then, a series of models that relate individual and economic factors to job retention over this period are estimated. These analyses suggest a general but mild decline in job stability during the period. However, trends in job stability vary dramatically across different groups of workers. Most clearly, job stability fell precipitously for black men and fell for men who were high-school dropouts or who has completed some college. 相似文献
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介绍了边坡稳定性分析的常用方法,阐述了各种方法的特点和应用。并针对多样化的稳定性分析方法的发展趋向作出论述,指出随着计算机技术的发展对边坡稳定分析有重要意义。 相似文献
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电源就如同是通信系统的血脉,只有保证了电源能够稳定的流淌,才能确保通信线路的正常运转。文章介绍了通信电源的现存情况及发展方向,并详尽从几个方面介绍了提高电源稳定性的相关措施。只有从从主观上足够重视,并时刻观察、记录、监督电源的运转状况,创造一个良好的客观运行环境,才能保证通信电源系统和通信管理系统的安全运行,确保通信的可靠畅通。 相似文献
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笔者根据扶壁式挡墙的计算模式,摸索出扶壁式桥台的构造及计算过程,并在实际工程中应用,为广大桥梁设计者提供一个同类工程的设计思路。 相似文献
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We consider crime level in an economic market with a supply of potential criminals. These criminals differ in their opportunity cost for committing crime, reflecting differences in the value of foregone opportunities such as performing productive labor. The realized demand is influenced by the expected value for crime, which depends on several socio-economic variables including wealth, police enforcement, and police arrest ability. After determining the equilibria level suggested by our approach, we propose a dynamic setup and study the stability of this system. Two critical enforcement levels are determined. Exceeding the lower enforcement threshold will push crime to stabilize (converge) to an equilibrium level. Correspondingly, exceeding the higher enforcement threshold will collapse the crime market to zero. 相似文献
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