气化模铸造碳钢铸件含碳量的变化

本文讨论气化模铸钢件合碳量变化的规律，包括表面增碳、表面脱碳和体积增碳等。试验表明，选择透气性良好的涂料，涂料厚度≤１．０ｍｍ，负压度０．０３～０．０４ＭＰａ，可将表面和体积增碳减少到０．０２％以下。     

内幕交易民事责任及诉讼机制探讨

不同类型的内幕交易受害人取诉权的条件和方式不尽相同。内幕交易民事责任的各个构成要件都有其特定内涵。内幕交易民事诉讼机制由代表人诉讼和股东派生诉讼所构成。     

碳纤维布加固钢筋混凝土梁抗弯性能试验研究

通过两根简支梁的试验,研究了碳纤维布加固钢筋混凝土梁的受弯性能.试验结果表明,经碳纤维布加固后的钢筋混凝土梁的开裂载荷、极限载荷和刚度均有不同程度的提高,裂缝宽度明显减小.另外,针对试验中加固梁破坏时碳纤维强度并未完全发挥这一现象,提出在实际加固应用中应考虑适当的碳纤维强度利用系数.     

中国风险投资发展:国外经验借鉴与国内政策措施

国外风险投资发展的成功经验为中国发展风险投资提供了很好的借鉴。我国发展风险投资的措施,主要包括:引导和探索多种形式的风险投资组织形式;加大对高新技术产业和风险投资的优惠政策;制定和完善风险投资相关法规;建立多层次股权交易市场疏通退出渠道;对风险投资直接监管与间接监管相结合。     

有关股评价值的实证研究

以2000年股评家推荐的2052只股票作为样本,并根据推荐的持有策略将其分成短线和中线两组来分析股评的投资价值.研究结果对我国股评家属于信息驱动型提出了质疑,并指出,即使考虑交易费用,被推荐的短、中线个股(组合)仍然具有一定的投资价值.从长期来看,个股(组合)可以显著获得超常收益或赢利;与中线相比,短线个股(组合)的期望收益较高、风险较小.     

Mass Customization in the Automotive Industry: Comparing Interdealer Trading and Reconfiguration Flexibilities in Order Fulfillment

Mass customization has been viewed as desirable but difficult to achieve in the volume automotive sector. Here we consider flexibility in automotive order fulfillment systems to enhance the ability to satisfy customers with their desired vehicle variants within acceptable delivery lead times. Two types of flexibility are compared in a Virtual‐Build‐to‐Order system—reconfiguration in the planning pipeline and interdealer trading. A representative simulation model is used to investigate the impact of the two types of flexibility across a wide spectrum of product variety levels. The impacts on major stakeholders in the system—the producer, dealers, and customers—are considered. The study shows that both types of flexibilities can bring significant benefits in terms of reductions in lead time and inventory holding. The level of product variety strongly influences the observed effects—an important finding in the mass customization context. Upstream reconfiguration flexibility brings greater benefits than downstream trading flexibility. Reconfiguration tends to dominate trading as a fulfillment mechanism when both are in operation. The findings have implications for the design and management of automotive order fulfillment systems in improving their ability to offer mass customization. The study has relevance for companies in other sectors with high levels of variety that seek to combine efficiency, speed, and flexibility in order fulfillment.     

“双碳”治理视角下碳捕集、利用与封存政策的中国样本审视

探究中国现行碳捕集、利用与封存政策的特征与不足,可为我国将来的政策制定及体系优化提供参考。以2006年2月至2022年12月中央和地方发布的143份有效政策文本为研究对象,构建基于“政策工具-目标领域-政策主体”的三维分析框架模型。结合统计学方法、结构分析法和内容分析法等研究方法,分别探究了碳捕集、利用与封存政策的演进历程、政策工具、政策目标领域、政策主体、政策力度等内容特征。结果表明,在“双碳”目标导向下,中国碳捕集、利用与封存政策正在展开布局,战略目标逐步明晰,但仍然存在专项政策缺位、政策工具结构分布不均衡、政策主体合作联系密度不高、碳捕集、利用与封存全流程技术标准不完善等问题。基于此,未来应当强化政策力度,构建面向碳中和目标的碳捕集、利用与封存专项政策;高效配置多元政策工具,构建政策工具的综合应用模式;完善碳捕集、利用与封存产业链,优化产业布局结构。     

Finding and Implementing Energy Efficiency Projects in Industrial Facilities

This study addresses the challenges of finding and implementing profitable energy efficiency (EE) projects, a critical foundation for sustainable operations. We focus on manufacturing enterprises, but many of our findings apply also to the back office of service operations. Our starting point is that, in nearly every industrial enterprise, there are many profitable EE projects that could be implemented but are not. An oft‐cited hindrance to implementation is the lack of an internal management framework in which to find, value, and execute these projects. Using a conceptual approach, we rely on proven sustainable operations tools to develop such a framework. We identify three major value drivers of EE projects: savings intensity, “green” image, and project complexity. We then describe a framework for understanding the context of EE projects in industry, with an underlying analytic foundation in optimal portfolio analysis. A case study of a large manufacturing site is used to illustrate emerging best practices—based on Kaizen management principles—for integrating EE project management with operations, engineering, and strategy.     

Strategic Liquidity Provision in Limit Order Markets

We characterize and prove the existence of Nash equilibrium in a limit order market with a finite number of risk‐neutral liquidity providers. We show that if there is sufficient adverse selection, then pointwise optimization (maximizing in p for each q) in a certain nonlinear pricing game produces a Nash equilibrium in the limit order market. The need for a sufficient degree of adverse selection does not vanish as the number of liquidity providers increases. Our formulation of the nonlinear pricing game encompasses various specifications of informed and liquidity trading, including the case in which nature chooses whether the market‐order trader is informed or a liquidity trader. We solve for an equilibrium analytically in various examples and also present examples in which the first‐order condition for pointwise optimization does not define an equilibrium, because the amount of adverse selection is insufficient.     

西北地区能源消费、经济增长与碳排放的关系研究

能源消费、碳排放与经济增长之间的关系研究对实施节能减排、发展低碳经济具有至关重要的意义。该文基于西北五省统计年鉴数据,测算了1992—2011年煤炭、石油、天然气三种能源的碳排放量,并从近似关系和脱钩关系两个角度刻画了能源消费、碳排放量与经济增长之间的关系。结果表明:1992—2011年,西北地区碳排放总量及煤炭、石油、天然气引起的碳排放量总体呈上升趋势,碳排放主要来自于煤炭消费;西北地区能源消费总量与碳排放总量的变动趋势近似,能源强度与碳排放强度的变动趋势近似;碳排放与经济增长的脱钩弹性指数类型、能源消费与经济增长的脱钩弹性指数类型表现基本上一致,且在大部分年份指向弱脱钩状态,未来一定时期内弱脱钩发展趋势可能仍将持续。