微型晶体振荡器的研制

本文介绍的微型晶体振荡器有普通型、快速加热简易恒温型、多信号输出等三种类型晶振.其中快速加热简易恒温型在常温下工作时,频率—温度特性达10~(-7),在正温范围工作时,频—温特性达lO~(-6)/(0℃～80℃),多信号输出型目前已作出的每台晶振有1OMHz、5MHz、1MHz、500KHz、1OOKHz等五个频率的信号输出,其频率稳定度为10~(-5).晶振的振荡电路、放大电路、温控电路及分频电路,均以集成技术来实现,并与石英晶体谐振器—同用电阻焊密封于16×16×5.5(mm)~3的金属盒内,其重小于5克.     

Establishing the validity of cycle path capacity assumptions in the Highway Capacity Manual

Cycle mode share increase is widely desired, but highway design practitioners lack the numerical tools to deliver infrastructure, instead relying on design standards and intuition, with little literature basis. As a case in point, the US Highway Capacity Manual (which is well used internationally) has developed levels of service for cycle infrastructure that are, at their core, based on an assumption of noninteraction between multiple cyclists. This paper uses a modified implementation of the Social Force Model to test the validity of this assumption. Necessary changes such as the consideration of acceleration characteristics and minimum maintainable speed are included. The resulting model produces valid outcomes in keeping with established traffic flow properties, reflecting three-phase traffic flow theory and the ability for the stochastic elements in traffic flow to cause flow breakdown. The developed simulation indicates that there is a fundamental difference in outcome if cyclists are assumed to have a fixed speed versus one they can change given their surroundings. This difference in outcomes is found to exist within the range of literature design flow capacities for bicycle infrastructure and also yields emergent outcomes that align closely with those known behaviors of highway vehicles, which intuitively transfer to cyclists. These findings reinforce the standing need for large-scale empirical studies to determine the basic numerical and behavioral parameters for cyclists, upon which all design ultimately rests.     

Rare disaster risk and the expected equity risk premium

Consistent with the predictions of rare disaster models, we find that a proxy for the time‐varying probability of rare disasters helps to explain fluctuations in expectations of the equity risk premium. Our proxy for disaster risk is a recently developed measure of global political instability, and the expected market risk premium is from Value Line analysts' expected stock returns. Consistent with long‐run risk models, uncertainty about expected GDP growth and expected consumption growth is also significantly positively related to the expected market risk premium. We obtain similar results when we use the earnings–price ratio and the dividend–price ratio as proxies for the expected market risk premium.     

A framework for innovative service design

Drawing on research from design science, marketing, and service science, our paper provides an integrated framework for evaluating and directing innovative service design. The main goal of our review is to highlight the strengths of existing frameworks and to suggest how they can be enhanced in combination with design science principles. Based on our review, we propose a new framework for the design of innovative services that integrates several key paradigmatic approaches and identifies fundamental open research questions. Our approach is unique as it combines three service disciplines, namely services marketing, service science, and design science, and provides a new framework that describes step by step the procedure that needs to be taken and the conditions that need to be met for developing innovative services. We believe that providing such a framework is a valuable addition to the literature.     

How quickly is temporary market inefficiency removed?

I provide evidence on the length of time it takes for arbitrageurs to exploit attractive investment opportunities. A unique data set from the Internet sports betting market allows me to focus on the speed of investor response in an environment that is not affected by the joint hypothesis problem. The market does not instantly converge to an efficient level after mispricing occurs, but the adjustment process is rapid. Arbitrageurs remove many of these opportunities within minutes of them being created and the majority are gone within an hour. Arbitrage opportunities that are more difficult to find last for longer.     

人民币的远大抱负

北京与六个国家和地区的央行签订了货币互换协议,包括香港、印度尼西亚、韩国,马来西亚、白俄罗斯,还有阿根廷。根据协议,这些央行可以向希望购买中国商品的本地进口商出售人民币。中国早就希望人民币能在全球金融体系中扮演更重要的角色,这些货币互换协议正是在这样一个政策目标的大背景下产生的。这个更广泛的政策目标对降低中国出口企业的外汇风险敞口和交易成本有着更为现实的作用。2008年初人民币兑美元汇率升值是一些中国出口企业破产的原因之一,以人民币进行贸易结算将会在未来降低这类风险。     

人民币的远大抱负

中国正越来越多地参与商讨解决当前经济问题的对策。讨论大部分是围绕着钱的问题——无论是温家宝总理对中国持有的美国国债价值的担忧,还是中国央行提出的以超主权储备货币取代美元的国际货币体系。到目前为止,制约中国向全球货币改革贡献力量的一大因素一直是中国自身的货币政策,特别是人民币不可自由兑换的事实。不过,现在有初步迹象显示情况正在开始发生变化。     

植物单宁的性质及应用

文章综述了植物单宁的性质及其在医药卫生、食品工业、化妆品、革鞣等领域的广泛应用.     

医院信息系统的安全管理维护

针对医院网络信息系统中易出现的各种安全方面的问题,提出了一系列的解决方法。