某量产车型前门窗玻璃升降抖动问题研究

文章对某量产车型前门窗玻璃升降抖动问题进行了研究,找出了产生该问题的根本原因,并制定了相应的解决措施。样件的试装结果说明:采取的解决措施是有效的,解决了玻璃升降抖动的问题。     

“压缩动态虚拟视窗算法”在自动拣选系统中的应用

对自动拣选系统工作模式及工作步骤进行分析,给出压缩动态虚拟视窗算法数学模型,在此基础上,设计应用算法,使压缩动态虚拟视窗算法的使用方法明确化。     

浅析建筑外窗抗风压性能

抗风压性能是衡量建筑外窗物理性能的重要环节,结合外窗检测过程中遇到的一些问题,根据工作实践,浅谈影响窗户抗风压性能的几个原因。     

一种新型平面结构的双陷波超宽带天线设计

为了避免现存的一些窄带通信系统对超宽带天线的干扰,提出了一种具有双陷波特性的超宽带天线结构。由于采用了渐变式阶梯阻抗匹配结构作为超宽带基础天线的馈电,使天线具有了宽阻抗匹配能力。通过在基础天线背面附加双偏T寄生单元和在辐射贴片上开窗的联合方法,实现了超宽带天线的双陷波特性。天线电流分布结果可以完全反映出在陷波频率下两种方法的谐振抑制作用,而且实验结果表明该结构的天线对 WLAN(5.15～5.825 GHz) 和WiMAX(3.4～3.69 GHz)频段的信号起到了有效的抑制作用,同时在工作频段内表现出较好的全向辐射特性。     

Extending perfect timing theory: not just one but several windows of opportunity

ABSTRACT

A recent study investigated the optimal time to enter emerging industries, introducing the existence of a window of opportunity for firms. The present study doubted its validity in a situation labeled as ‘long-tail industry life-cycle’. It is proposed that the concept ‘window of opportunity’ could be valid also in long-tail industry life-cycle situations, but that in these cases several windows of opportunity could emerge, at the subsystem or component level, after the establishment of a dominant design at the product level. The crux of the problem, as detailed in the rest of the paper, is represented by product architecture.     

沙特HRDH区块开窗侧钻及配套技术研究与应用

针对HRDH油田开发状况和油藏特点,特别是在小井眼侧钻井钻头选型技术、小井眼侧钻井钻具结构优化技术、小井眼MWD复合导向钻井以及小井眼扩眼技术、完井管柱优选等方面的研究与应用取得进展,机械钻速大幅度提高,钻井周期显著缩短。     

Use of the Proceeds and Long‐term Performance of French SEO Firms

This paper examines the long‐term stock performance of French SEO with rights by looking at the intended use of the proceeds. Firms that raise equity for pure capital structure motives are separated from the ones that use the SEO proceeds to finance specific investment projects. Issuers in the first category are concerned about preserving their financial flexibility and they are expected to evolve in a capital structure irrelevancy framework. On the other hand, issuers in the second category are more inclined to be sensitive to adverse selection problems or agency conflicts and thus, they should be more exposed to under‐reaction on the long‐run. According to a matching firm methodology, ‘Financing New Investment’ issuers underperform their benchmark at a rate of 4% to 8% per year over a 36‐month horizon while ‘Capital Structure’ issuers do not show any abnormal performance. These results are robust according to alternative Beta pricing models. In addition, managers of both issuer's types time the SEO after a period of positive abnormal performance in order to sell overpriced securities. However, only the ‘Financing New Investment’ sample experiences a performance reversal; the abnormal returns decreasing gradually from the issue on, to become significantly negative 24 months after the event.     

版式设计意识介入商业橱窗设计

要体现橱窗的价值,更好地美化城市,设计师在处理橱窗设计时应该有合适的设计指导思想。将版式设计的意识介入到橱窗展示设计中,这不但是二维设计与三维设计知识互通的体现,更是为橱窗设计的成熟发展提供了强大的理论平台。     

Securitization markets and central banking: An evaluation of the term asset-backed securities loan facility

In response to the near collapse of US securitization markets in 2008, the Federal Reserve created the Term Asset-Backed Securities Loan Facility, which offered non-recourse loans to finance investors’ purchases of certain highly rated asset-backed securities. We study the effects of this program and find that it lowered interest rate spreads for some categories of asset-backed securities but had little impact on the pricing of individual securities. These findings suggest that the program improved conditions in securitization markets but did not subsidize individual securities. We also find that the risk of loss to the US government was small.     

Oil consumption and economic efficiency: A comparative analysis of advanced, developing and emerging economies

This paper investigates the economic efficiency-oil consumption relationship in 42 countries during the period 1986-2006. In a first stage by using DEA window analysis countries' economic efficiencies are obtained. In a second stage an econometric analysis based on robust GMM estimators reveals an inverted ‘U’-shape relationship between oil consumption and economic efficiency. In order to capture heterogeneities among countries' development stages the analysis has been separated into two groups (advanced economies and developing/emerging economies). The results show that advanced economies have much higher turning points compared to emerging and developing economies. It appears that oil consumption increases countries' economic efficiency. In addition the consumption patterns of oil products and its derivatives have changed through years and among countries. The different turning points from the econometric analysis indicate the dependence of oil consumption in advanced economies (higher turning points) is driven mainly by household purchasing activities and their standards of living (transport, housing and water, food, etc.). Finally, it appears that oil consumption is the main driver behind the progress of industrialization and urbanization regardless of the country's development stage.