空气压缩机系统余热回收在空调系统中的应用

对空气压缩机的压缩余热进行回收利用,可以降低压缩空气系统损耗,提高生产力,实现节能降耗。将空压机余热用于空调系统冬季采暖和生活热水供应,节能效果良好,经济效益明显,具有实用和推广价值。     

我国城市自然灾害与应急管理体系研究

对我国城市面对的突发自然灾害形势和特点进行了分析,认为我国城市自然灾害风险高,具有灾害形势复杂、救灾工作难度大的特点,目前我国城市灾害应急体系建设具备法制、体制、预案、人才基础,但也存在法制不健全、机制不完善、灾害意识淡薄的问题,提出了完善体制机制、健全机构、提高承灾能力、增强居民应对能力的相关对策和建议。     

Recovery of hidden state participation effects on oil and gas asset values

Commodity price shocks are shown to cause shifts in both the quantity and timing of risk in natural resource assets. We provide evidence that static risk measures understate the periodicity of price risk implicit in depleting assets. Risk measurement is demonstrated to be asset specific and to vary heterogeneously in response to the combined effects of state participation and market factors. We use a global sample of oilfield assets to demonstrate that oilfield participation terms cause corporate asset cash flows, volatility horizons and minimum variance hedge ratios to vary in response to oil price. We provide additional insights into movements in the timing of physical oil and gas asset risk, a hidden effect not recoverable from market oil prices. Temporal variance for physical assets is shown to be a hidden dimensional outcome of the effects of market factors and state participation.     

A Technique for Reducing Discretization Bias from Monte Carlo Simulations: Option Pricing under Stochastic Interest Rates

Abstract

Control variates are often used to reduce variability in Monte Carlo estimates and their effectiveness is traditionally measured by the so-called speed-up factor. The main objective of this paper is to demonstrate that a control variate can also be applied to reduce the bias stemming from the discretization of the state variable dynamics. This is particularly valuable when stochastic interest rate models are discretized, since bias reduction through more grid points is computationally expensive.     

Rating of worry about energy sources with respect to public health,environmental health,and workers

Environmental risks of different energy sources pose a significant problem for managers, decision-makers, and the general public. Attitudes and perceptions may differ by type of energy, as well as the recipient of the harm. A post-Fukushima survey of students and others in a university community in central New Jersey was conducted to determine how much people worried about the potential effects of different energy types (nuclear, chemical, coal, hydroelectric, solar, wind, and gas), which aspect they worried about (public health, workers, and the environment), and which form they thought the USA should further develop. Ratings for worry varied significantly by energy type and receptor type. In general, worry was greater for all aspects of chemical, coal, nuclear, and gas, and significantly less for hydro, solar, and wind. Worry was generally higher for exposure from the plant, exposure from food and water, exposure to workers, and exposure for wildlife than for either transportation issues or exposure from everyday occurrences. The same exposures (or targets) were rated for each energy source. The greatest worry for each energy type was as follows: (1) nuclear exposure to radiation in food, although worker exposure and exposure from the plant were very close, (2) chemical exposure was from accidents in the plant, (3) coal was from harmful effects of mercury on wildlife, (4) hydro was from contamination of drinking water, (5) solar was from harmful UV radiation exposure in wildlife, (6) wind was from mortality of birds due to wind turbines, and (7) gas was from harmful gas exposure to wildlife. Overall, the highest rated features in terms of worry (four of seven energy forms) were for wildlife. The survey population believed that wind, solar, tidal, and hydro power should be developed further, and coal should be developed the least.     

Risk perception and risk management in the Middle East market: theory and practice of multinational enterprises in Saudi Arabia

This exploratory study investigates the risk perception and risk management strategies of Western multinational enterprises in the Middle East. A sample of 49 German companies operating in Saudi Arabia provides the empirical setting for this research. The study reveals that cultural risk is assessed as more important in the business environment than political, financial, and economic risk. The most critical risk factors are not sufficiently included in the methodology of country risk measures, which are often used as a source for country‐specific risk information. In terms of risk management strategies, participating firms use mostly informal approaches rather than structured hedging or insurance products. Furthermore, we find that firm size has implications on the perception of some risk factors and for the level of risk management sophistication.     

Fast simulations in credit risk

We consider the problem of simulating tail loss probabilities and expected losses conditioned on exceeding a large threshold (expected shortfall) for credit portfolios. Our new idea, called the geometric shortcut, allows an efficient simulation for the case of independent obligors. It is even possible to show that, when the average default probability tends to zero, its asymptotic efficiency is higher than that of the naive algorithm. The geometric shortcut is also useful for models with dependent obligors and can be used for dependence structures modeled with arbitrary copulae. The paper contains the details for simulating the risk of the normal copula credit risk model by combining outer importance sampling with the geometric shortcut. Numerical results show that the new method is efficient in assessing tail loss probabilities and expected shortfall for credit risk portfolios. The new method outperforms all known methods, especially for credit portfolios consisting of weakly correlated obligors and for evaluating the tail loss probabilities at many thresholds in a single simulation run.     

Managing in conflict: How actors distribute conflict in an industrial network

IMP researchers have examined conflict as a threat to established business relationships and commercial exchanges, drawing on theories and concepts developed in organization studies. We examine cases of conflict in relationships from the oil and gas industry's service sector, focusing on conflicts of interest and resources, and conflict as experienced by actors. Through a comparative case study design, we propose an explanation of how actors manage conflict and manage in conflict given that they tend to value and maintain relationships beyond episodes of exchange. We consider conflicts in relationships from a network perspective, showing that actors experienced these while adapting to changes in their business setting, modifying their roles in that network. By identifying conflict with the organizing forms of relationship and network, we show how actors formulate conflict through pursuing and combining a number of strategies, distributing the conflict across an enlarged network.     

嘉禾矿V煤层瓦斯基础参数测定及研究

为了避免瓦斯抽采设计的盲目性和不合理性,需要对矿井煤层的瓦斯基本情况有准确的把握。本文通过对嘉禾矿井V煤层瓦斯基础参数进行测定,分析掌握矿井瓦斯的赋存规律、煤的相关物理性质等特征,为该煤层瓦斯综合治理方案制订及抽采设计提供有力的科学依据。     

瓦斯爆炸阻隔爆技术的研究与发展

对国内目前应用广泛的被动隔爆技术和自动隔爆技术等抑爆技术进行了总结和概述,分析了优缺点,介绍分析了国内外一些先进研究成果,有采用真空腔体阻爆技术,新型水幕阻爆技术,HS ExploSpot瓦斯阻燃抑爆系统技术和多孔材料阻爆技术等,这些技术在一定程度上为瓦斯爆炸防治领域开辟了新的途径。