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摩擦滑动起始的动力学特征
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作者 Oded Ben-David gil cohen +2 位作者 Jay Fineberg 左玉玲(译) 郑需要(校) 《国际地震动态》 2011年第5期10-15,38,共7页
摩擦界面的失效方式对于我们从根本上认识工程学至地震学领域中的失效过程非常关键。摩擦运动起始于将两个剪切体分离的薄界面内传播的破裂前沿。通过测定沿界面的剪切应力和法向应力,结合随后的实际接触面积动态学特性,我们发现剪切应... 摩擦界面的失效方式对于我们从根本上认识工程学至地震学领域中的失效过程非常关键。摩擦运动起始于将两个剪切体分离的薄界面内传播的破裂前沿。通过测定沿界面的剪切应力和法向应力,结合随后的实际接触面积动态学特性,我们发现剪切应力与法向应力之比在局部可远远超过没有发生突然滑动的静摩擦系数。而且,系统所选的不同破裂模式与局部应力比的不同控制程度相对应。这些结果表明非均匀性在摩擦稳定性及动力学特性方面起着至关重要的作用,这对不同地震模式的预测、选择和确定有着启示意义。 展开更多
关键词 摩擦滑动 动力学特征 动力学特性 剪切应力 摩擦界面 法向应力 破裂模式 静摩擦系数
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Is It Profitable to Invest According to the VIX Fear Index?
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作者 Mahmod Qadan gil cohen 《Journal of Modern Accounting and Auditing》 2011年第1期86-90,共5页
This study demonstrates how the volatility index (VIX) can help predict the returns for sequential trading days. Using a logit function and previous VIX information, we present an initial attempt to estimate the pro... This study demonstrates how the volatility index (VIX) can help predict the returns for sequential trading days. Using a logit function and previous VIX information, we present an initial attempt to estimate the probability of a positive market return. The estimation procedure is applied to recent data on the S&P500 and to the 10-year U.S. Treasury Bonds yields. Our findings indicate that such a relationship does exist and is significant, especially for the bond market. We also ran an investment simulation using different VIX scores and found that from 2004 to June 2009, VIX=18 was the score that yielded the highest. 展开更多
关键词 VIX VOLATILITY logit-function probability
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Uncertainty about interest rates and crude oil prices
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作者 Mahmoud Qadan gil cohen 《Financial Innovation》 2024年第1期3989-4002,共14页
The yield on the 10-year U.S.Treasury Note is among the most cited interest rates by investors,policymakers,and financial institutions.We show that the 10-year Treasury yield’s forward-looking volatility,a VIX-style ... The yield on the 10-year U.S.Treasury Note is among the most cited interest rates by investors,policymakers,and financial institutions.We show that the 10-year Treasury yield’s forward-looking volatility,a VIX-style measure that is a proxy for uncertainty about future interest rates,is a useful state variable capable of predicting the returns and volatility of crude oil prices over the near term.Using monthly data from 2003 to 2020,we document that higher implied volatility in the 10-year U.S.Treasury derivatives market predicts declining oil prices and higher forward-looking volatility in those prices.Our results are robust to different subsamples and various empirical designs. 展开更多
关键词 Bond VIX Forecasting Treasury futures OPTIONS Implied volatility Oil price
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