智能凝胶GD-1混堵技术在靖边气田的应用

靖边气田钻井过程中发生井漏,采用常规堵漏技术(桥塞堵漏、水泥浆堵漏)常堵漏不彻底、容易出现井漏反复等井下复杂情况。基于常规堵漏方法,引进智能凝胶GD-1混堵技术在靖边气田南部黄土表层、刘家沟组裂缝地层应用,取得了良好的防漏、堵漏效果:提高了堵漏成功率,减小堵漏反复性,二次堵漏的几率明显降低。     

Mean reversion in annual earnings and its implications for security valuation

This article documents the long-horizon mean reverting character of annual earnings and tests the implications of such mean reversion for security valuation. First, both theory-based and nonparametric measures of earnings persistence decrease as the estimation order increases, revealing 40 percent less long-horizon persistence than expected under the commonly used random walk model. Second, the return responses to the earnings shocks are more closely related across firms to the higher-order measures of persistence that reflect significant long-horizon mean reversion. Third, the persistence measure derived from classical valuation theory outperforms the generic measure in explaining the return responses. Taken as a whole, these results provide evidence for significant mean reversion in the higher-order properties of earnings and for the stock market incorporating these properties in a manner consistent with classical valuation theory.     

The "Invisible Hand"

The argument of the "Invisible Hand" is that the system of free enterprise benefits society in general even though it is not the aim of any particular economic agent to do that. This article proposes an analysis of why this is so. The key is that the morality of the market forbids only force and fraud; it does not require people to do good to others. Nevertheless, when all transactions are voluntary to both parties, that is exactly what we can expect to happen. This is both because the sum of the benefits of innumerable transactions, which are beneficial to both parties, is very great, but also and especially because of Positive Externalities. People use the particular products and services they get in market exchanges in ways that benefit others in ways not at all foreseen by the agents to those transactions at the time. These externalities range from the benefits of invention and ingenuity to the exercise of charity and philanthropy, all of which flourish in developed capitalist societies.     

Effective experimental controls for research in international accounting: Further thoughts

This paper responds to recent research by Ruland et al. [Ruland, W., Shon, J., Zhou, P., 2007. Effective controls for research in international accounting. Journal of Accounting and Public Policy, 26(1), 96–116.] that addresses the effectiveness of experimental controls for research in international accounting, with focus on Ndubizu and Sanchez [Ndubizu, G.A., Sanchez, M.H., 2006. The valuation properties of earnings and book value prepared under US GAAP in Chile and IAS in Peru. Journal of Accounting and Public Policy 25 (2)]. We attempt to remove some misconceptions about effective experimental controls that have surfaced in the debate. We argue that theory and refined proxies alleviate many of the control issues that have surfaced in the literature.     

基于IAPWS-IF97的水和水蒸气热力性质计算在智能手机中的应用

智能手机的普及使我们的生活发生了重大的改变,而另一方面,在工业应用中仍然使用老方法来查找水蒸气的性质。文章介绍了如何将基于IAPWS-IF97的水蒸气性质计算软件移植至手机平台及其应用。     

铁路项目经营性评价和投资分类管理研究

论文分析铁路设施项目的一般特点，运用相关基础理论，建立项目可经营性评价体系和模型，对项目的可经营性程度进行定量分析，提出经营性视角下铁路项目区分和投资分类管理方法，科学界定政府和市场的投资职责。最后应用研究的理论成果，对部分铁路设施项目进行了分析。     

蛋白质溶胶的流变特性及应用研究进展

介绍了蛋白质和改性蛋白质溶胶的流变特性，指出蛋白质溶胶的流变特性主要为非牛顿流体的假塑性流体，且其流变特性受诸多因素的影响；蛋白质经过改性后，流动性有较大的改善。最后概述了蛋白质溶胶流变特性方面的应用。     

公允价值计量属性探析

如何将公允价值理论很好地运用于实践,并有效地指导实践是公允价值研究的重点和难点。现就新准则中公允价值的计量属性进行探讨。     

中国硅胶行业的生产现状和发展探讨

介绍中国硅胶行业技术进展和存在问题，今后应提高硅胶的产品质量，重点开发高附加值的微米级硅胶。     

集装袋老化力学性能试验研究及其灰色预测

考虑粮食集装袋不同的使用环境，通过老化试验对集装袋的老化行为进行研究，探讨了自然暴露和不同温度条件对集装袋性能的影响。结果表明，随着老化时间的增加，集装袋基布的抗拉强度、断裂伸长率下降。自然暴露对基材性能的影响最为显著，高温环境下次之，低温环境下最不显著。基布的抗老化性能与气候条件的变化密切相关，随着温度的升高、光照强度增强，基布老化加剧。同时，基于灰色预测理论，对集装袋横向基布自然老化力学性能进行预测，预测结果精度较高。