影响孤东油田注汽系统效率的因素及对策

结合孤东油田稠油注汽开发工作实际，分析了注汽系统效率现状及存在问题，指出了影响油田注汽系统效率提高的三个方面因素．即注汽管网热损失较大影响注汽系统效率、注汽井筒隔热管热损失大注汽效果难以保证、注汽干度稳定性差影响系统效率．并针对存在问题和影响系统效率提高的因素，提出了相应的对策与措施。     

高粘度稠油开采方法的现状与研究进展

论述了目前国内外正在研究和使用的各种高粘度重质稠油的开采方法,比较了其优缺点,认为微生物法和井下催化法具有十分重要的经济意义和社会意义。     

重油催化裂化装置安全评价

运用道化学公司火灾、爆炸危险指数评价方法对广州石化重油催化裂化装置进行安全评价，定量地认识该装置的危险性，提出安全建议。     

Distribution of parallel exchange rates in African countries

This paper investigates the distribution of parallel exchange rates in African countries using exploratory data analysis techniques and model fitting. Stable laws are fitted to empirical distributions using the maximum likelihood estimation method. Empirical evidence supports the stable hypothesis these distributions are positively skewed and have tails that are much heavier than Gaussian counterparts. The stable hypothesis is further supported by the “converging variance test,” which suggests that these distributions have infinite variance.     

基于供应商角度的我国重型机械设备制造业应收账款回收风险研究

随着我国加入WTO,在全球经济大背景下,我国经济高速发展的同时也加剧了市场竞争。在买方市场处于优势的经济环境下,为了争取更多的客户,供应商普遍采用商业信用、赊销等方式相互竞争。企业应收账款急剧增长,供应商面临的应收账款回收风险日趋增大。我国学者对应收账款回收风险的研究并不缺乏,但是针对某一特定行业的研究相对较少。文章在前人研究的基础上,基于供应商的角度提出了将主成分分析与Z计分模型结合使用来建立风险预警模型,并以此来分析影响我国重型机械设备制造业应收账款回收的因素,试图提出相应的对策,来帮助供应商减少应收账款的回收风险。     

重污染企业技术创新与减污降碳耦合协调研究

在“双碳”背景下,本文通过测度企业技术创新与减污降碳之间的耦合协调关系,并在此基础上通过面板向量自回归模型进一步探究其耦合协调的影响因素,以厘清重污染企业协调发展的现状。实证结果表明：技术创新与减污降碳耦合协调度的变动主要取决于企业技术创新水平,2012年至2021年的耦合协调度整体在勉强协调和中级协调间浮动,主要集中在初级协调阶段,其耦合协调效应良好。环境规制和数字化程度对耦合协调度的影响显著为正,能够促进耦合协调发展。     

建设节约型社会 应从重化工业入手

重化工业的发展对于我国的工业化具有极其重要的作用,并且其发展一直保持较高的速度,在国民生产总值中的比重高于轻工业。但按传统模式发展重化工业将会受到资源、环境等方面的制约,难以为继。因此,建设节约型社会应从重化工业入手,通过法律的、经济的、行政的手段,调动企业节约资源、保护环境的积极性,实现社会经济发展与资源环境的协调和良性循环。     

Dynamic jump intensities and risk premiums: Evidence from S&P500 returns and options

We build a new class of discrete-time models that are relatively easy to estimate using returns and/or options. The distribution of returns is driven by two factors: dynamic volatility and dynamic jump intensity. Each factor has its own risk premium. The models significantly outperform standard models without jumps when estimated on S&P500 returns. We find very strong support for time-varying jump intensities. Compared to the risk premium on dynamic volatility, the risk premium on the dynamic jump intensity has a much larger impact on option prices. We confirm these findings using joint estimation on returns and large option samples.     

Errors, robustness, and the fourth quadrant

The paper presents evidence that econometric techniques based on variance–L² norm–are flawed and do not replicate. The result is un-computability of the role of tail events. The paper proposes a methodology to calibrate decisions to the degree (and computability) of forecast error. It classifies decision payoffs in two types: simple (true/false or binary) and complex (higher moments); and randomness into type-1 (thin tails) and type-2 (true fat tails), and shows the errors for the estimation of small probability payoffs for type 2 randomness. The fourth quadrant is where payoffs are complex with type-2 randomness. We propose solutions to mitigate the effect of the fourth quadrant, based on the nature of complex systems.     

我国实施现代风险导向审计存在的问题及建议

我国在实施风险导向审计中仍然存在很多问题。文章对现代风险导向审计在实际应用中存在的问题进行了分析,并提出了相应的改进建议。