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企业并购、技术创新与过剩产能化解——来自新能源行业的证据
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作者 张巧良 何珮珺 《郑州航空工业管理学院学报》 2018年第2期33-43,共11页
低端产能过剩与高端供给不足并存,是我国新能源行业产能过剩的重要特征,企业并购作为改善产业结构、化解低端产能过剩、培育企业自主创新能力的重要手段被提出和推广。2010年以来我国新能源行业一直处于中度产能过剩,并购显著提高了企... 低端产能过剩与高端供给不足并存,是我国新能源行业产能过剩的重要特征,企业并购作为改善产业结构、化解低端产能过剩、培育企业自主创新能力的重要手段被提出和推广。2010年以来我国新能源行业一直处于中度产能过剩,并购显著提高了企业产能利用率,但在引入代表企业技术创新的中介变量后发现,并购后技术创新并未对治理产能过剩起到中介作用。研究表明,以规模扩张为目的的企业并购只能暂时性地提高产能利用率,但有可能将企业再次拉回低端生产链,建议企业应借助并购,发挥自身优势,培育自主创新能力,从本质上优化新能源行业的产能供给质量。 展开更多
关键词 新能源行业 企业并购 技术创新 产能过剩
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Evaluation and analysis of influencing factors on the quality of carbon disclosure:An empirical study of CDP in China
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作者 SONG Yu-yuan zhang qiao-liang 《Ecological Economy》 2014年第2期144-158,共15页
The purpose of this paper is to evaluate the quality of corporate carbon disclosure and to analyze its influencing factors. With the hand-collected carbon information from annual reports, social responsibility reports... The purpose of this paper is to evaluate the quality of corporate carbon disclosure and to analyze its influencing factors. With the hand-collected carbon information from annual reports, social responsibility reports, sustainability reports and opened CDP questionnaires of the sample of 100 Chinese companies investigated by CDP from 2008-2011, the quality of carbon disclosure is defined by evaluating indicators obtained from factor analysis, and its influencing factors are studied from three aspects including company characteristics, financial features and corporate governance by means of correlation, differences comparison and regression analyses. Findings show that the quality of Chinese companies' carbon disclosure is mainly affected by company characteristics(such as the emission characteristics of one's industry and dual listed) and corporate governance(such as ownership concentration), but in perspective of financial features, there seems to be little relation between the disclosure quality and financing motivations. The practical implication of the paper is to help Chinese companies find out effective ways to improve carbon disclosure quality. The paper contributes to carbon disclosure literature by explaining the connotation of carbon information, providing a set of evaluation indicators of carbon disclosure and exploring the influencing factors from various perspectives. 展开更多
关键词 quality of carbon disclosure evaluation index company characteristics financial features corporate governance
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低渗透气藏产水压裂水平井产能评价 被引量:4
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作者 张芨强 雷霄 +2 位作者 张乔良 薛国庆 汤明光 《天然气地球科学》 EI CAS CSCD 北大核心 2019年第12期1701-1708,共8页
低渗气藏自然产能低,通常需要水力压裂等有效的储层改造手段才能正常见产,同时地层水的产出对气井产量的影响也不容忽视。基于对压裂水平井影响下流体的渗流规律分析,充分考虑流体渗流时产生的达西效应和非达西效应,划分流体的流动为地... 低渗气藏自然产能低,通常需要水力压裂等有效的储层改造手段才能正常见产,同时地层水的产出对气井产量的影响也不容忽视。基于对压裂水平井影响下流体的渗流规律分析,充分考虑流体渗流时产生的达西效应和非达西效应,划分流体的流动为地层内椭圆流以及裂缝到井筒间的线性流和径向流。引入椭圆坐标系下的标度因子和两相拟压力函数,对椭圆坐标系和直角坐标系进行换算,并利用当量井径理论和势的叠加原理,推导出地层内和裂缝内流动的综合产能方程。实例计算表明,该方程能较为准确地计算气井的无阻流量,具有较强的矿场实用性。从敏感性分析可知,裂缝的应力敏感和裂缝的技术参数对产能影响较大,其中裂缝参数存在一个最优设计值,在发挥气井产能同时也能带来最优的经济性;气井产水会严重影响气井产能,需要做好防水及治水措施。 展开更多
关键词 低渗气藏 气水两相 压裂水平井 标度因子 产能评价
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