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131.
分析了胜利油田集输系统常见的腐蚀类型和腐蚀机理,分别阐述了各种局部腐蚀的防护措施,并综合对比了各种防腐方法的优缺点.指出根据不同区块的实际腐蚀环境、介质及工艺条件,因地制宜、有的放矢地制定经济、合理的防腐措施是减缓和控制腐蚀的有效途径。 相似文献
132.
Over the past three decades, China has undergone tremendous economic and social change as a consequence of the transition from a centrally planned to a market economy. This paper examines a key feature of this transition – the privatization of the state‐owned enterprises (SOEs) – through both a theoretical model and empirical analysis. Using newly collected primary data from a variety of sources, we study how privatization of listed SOEs affects employment, wages, profits and other aspects of economic performance at the firm level. Our major finding is that privatization results in substantial downsizing of employment, increased labour productivity and rising profitability. 相似文献
133.
134.
基于间断平衡理论和高阶梯队理论,以2007-2017年中国沪深两市902家制造企业为样本,实证分析研发投入跳跃对企业绩效的影响以及高管过度自信的调节作用。结果显示:研发投入正向跳跃和负向跳跃均有助于提升企业绩效,高管过度自信正向调节研发投入跳跃与企业绩效间的关系。引入高管过度自信这一重要高管特征作为调节变量,有助于重新认识管理者心理偏差对企业创新行为和绩效的影响,较好地弥补了研发投入跳跃对企业绩效影响机制的研究空缺,丰富了创新间断平衡理论研究。研究表明,企业应重视高管心理特征的影响并结合自身实际情况,合理选择研发投入策略以改善企业绩效。 相似文献
135.
The paper studies the interaction between aggregation and persistence pertaining to skip sampling of stock variables as well as temporal aggregation of flow variables for the generalized fractional processes. We show that, for skip sampling, the long memory feature at the zero frequency can arise from the aggregation of a generalized fractional series, while temporal aggregation does not induce such phenomenon. Simulation results are included to demonstrate the practical relevance of the theoretical results. 相似文献
136.
In this paper, we examine irreversible investment decisions in duopoly games with a variable economic climate. Integrating timing flexibility, competition, and changes in the economic environment in the form of a cash flow process with regime switching, the problem is formulated as a stopping‐time game under Stackelberg leader‐follower competition, in which both players determine their respective optimal market entry time. By extending the variational inequality approach, we solve for the free boundaries and obtain optimal investment strategies for each player. Despite the lack of regularity in the leader's obstacle and the cash flow regime uncertainty, the regime‐dependent optimal policies for both the leader and the follower are obtained. In addition, we perform comprehensive numerical experiments to demonstrate the properties of solutions and to gain insights into the implications of regime switching. 相似文献
137.
The call options theory of corporate security valuation is applied to narrow-banking contingent claims of one bank, while the cap options theory is applied to synergy-banking contingent claims of another bank. This article investigates efficiency gains specified as equities of scope associated with the likelihood of the two banks involved in merger under capital regulation. We find that merger incentives are encouraged when the narrowing banking is conducted by the consolidated bank, whereas discouraged when the synergy banking is conducted. Raising bank capital requirement leads to an increased interest margin of the consolidated bank with the narrow banking valuation; however, to a decreased margin of the consolidated bank with the synergy banking valuation. An increase in the capital regulation reduces the merger incentives in the narrow banking valuation whereas increases the merger disincentive in the synergy banking valuation. These findings are consistent with the organizational theory that predicts a comparative advantage of narrow banking proposals in bank mergers. 相似文献
138.
Over the past 30 years, China has fully exploited its advantage to steadily foster an innovation system for the biomedical industry with Chinese characteristics, that is, ‘Government-guided, resource-integrated and long-term planning.’ The system originated from historically famous ‘863 program’ in the 1980s, evolved with a series of favourable policies in the different periods, and eventually has taken shape in the industrial clusters across the country. It features with a systematic and integrated R&D infrastructure (or public platform) at different levels. In this study, China’s biomedical innovation system will be examined and the leading role of Chinese authorities will be explored from the perspective of Triple Helix theory. As the ‘highland of innovation’, Shanghai case is highlighted with plentiful information gathered from primary sources in the involved agencies for the first time, including the Shanghai Biopharma Service Platform. 相似文献
139.
从20世纪后半期开始,印刷术时代没落,随之而来的是电视、广播、互联网乃至手机媒体的蒸蒸日上。以手机为代表的新媒体开始以全时、全速、全域、全民的特点充斥在快速成长的青少年生活中,青少年作为主流文化消费者在文化消费中所表现出来追求时尚、注重体验、忽略发展性消费的特点在一定程度上对传统文化家庭的消费决策产生影响。这种影响从根本上不可逆转地改变了传统家庭交流方式,家长被青少年感染,变身孩童化大人,青少年在相对自由的环境中真正得到了身份认同。由此看来,青少年的流行风格与传统家庭文化的碰撞,技术的发展和创新有利于推动传统文化机制的现代化创新。 相似文献
140.