Health Risks of Energy Systems

Health risks from fossil, renewable and nuclear reference energy systems are estimated following a detailed impact pathway approach. Using a set of appropriate air quality models and exposure-effect functions derived from the recent epidemiological literature, a methodological framework for risk assessment has been established and consistently applied across the different energy systems, including the analysis of consequences from a major nuclear accident. A wide range of health impacts resulting from increased air pollution and ionizing radiation is quantified, and the transferability of results derived from specific power plants to a more general context is discussed.     

配体场势与d轨道分裂的相对能量

以ｄ１组态的简单晶体场理论为基础，根据点群的对称性及配体场势的可加和性原则，讨论了各配体场中ｄ轨道分裂的相对能量的计算方法     

论清洁餐饮必须集清洁生产、清洁服务与清洁消费于一体

本文从简要分析餐饮业基本特征、地位、作用出发，从分析餐饮业供需矛盾中餐饮供给对餐饮消费主体的身体健康和生命安全可能造成危害的主要环境因素入手．创新提出了要实现清洁餐饮必须集清洁生产、清洁服务与清洁消费于一体。论述了餐饮清洁生产、清洁服务的供给，是实现清洁餐饮消费，即食品安全的根本保障。并提出在清洁生产、清洁服务与清洁餐饮消费三位一体运营全过程中应实现餐饮业节能降耗减排。     

试论我国的节能政策及改进

以公共政策分析的视角,剖析我国现行节能政策的制定、执行过程中的特点及问题,认为设立全国性的能源工作领导机构,建立完善节能政策相关的政策群以及加大政策执行的监管力度是目前我国节能政策改进的重要方面。     

Moments of the sampled autocovariances and autocorrelations for a Gaussian white-noise process

Cumulants, moments about zero, and central moments are obtained for the mean-corrected serial covariances and serial correlations for series realizations of length n from a white-noise Gaussian process. All first and second moments (and some third, fourth, and higher moments) are given explicitly for the serial covariances; and the corresponding moments for the serial correlations are derived either explicitly or implicitly.     

基于ABAQUS的高速切削锯齿形切屑仿真

为了更好地研究在高速金属切削过程中出现的锯齿形切屑的形成机理,以ABAQUS/Explicit软件为平台,利用 有限元方法对AISI1045的高速切削过程进行了建模与仿真,建立了分离线模型,利用拉格朗日网格划分方法对模型进 行了网格划分,实现了仿真功能,获得了在锯齿形切屑形成的过程中,应力、温度、切削力和总能量随时间变化情况的数 据。在此基础上,以绝热剪切理论为基础分析了锯齿形切屑的形成机理。研究表明,在应力和温度图中,有明显的绝热 剪切带,说明了用绝热剪切理论分析高速切削塑性材料的可行性;锯齿形上升的总能量图说明了加工过程是一个有规律 的振动的过程;切削力的波动图说明了切削振动的频率过大。     

粮食生产的能源投入及技术变动趋势

为探究中国粮食生产的能源投入及技术变动趋势,构建了粮食生产超越对数生产函数模型,基于全国30个省份面板数据进行实证分析。结果显示,化肥、农药、农用柴油等能源投入对粮食生产的影响较大,化肥、农药的边际作用呈递减趋势,劳动力、农用柴油、机械动力的边际作用呈递增趋势,各能源要素与劳动力的替代关系明显。为此,在中国未来的粮食生产中,要提高化肥、农药、农用柴油等能源要素的利用效率,通过技术创新提升农业机械动力、劳动力的生产贡献程度,推动粮食生产向精细化和能源节约方向转变。     

Approximating moments of continuous functions of random variables using Bernstein polynomials

Bernstein polynomials have many interesting properties. In statistics, they were mainly used to estimate density functions and regression relationships. The main objective of this paper is to promote further use of Bernstein polynomials in statistics. This includes (1) providing a high-level approximation of the moments of a continuous function $g\left(X\right)$ of a random variable $X$, and (2) proving Jensen’s inequality concerning a convex function without requiring second differentiability of the function. The approximation in (1) is demonstrated to be quite superior to the delta method, which is used to approximate the variance of $g\left(X\right)$ with the added assumption of differentiability of the function. Two numerical examples are given to illustrate the application of the proposed methodology in (1).     

西部大开发中能源工业发展的思考

在西部大开发中 ,西部能源工业的发展有生态环境脆弱、教育和科技力量薄弱、人才严重不足、基础设施落后等制约因素。为此 ,发展西部能源工业应采取发展西部各类教育、加快基础设施建设步伐、对西部新建的能源资源型城市要加强其功能多元化建设等对策     

经济增长、能源消耗、金融发展对碳排放的影响——基于金砖四国的实证研究

本文基于1993-2013年的数据,采用面板数据模型探讨了金砖四国经济增长、能源消耗、金融发展对碳排放的影响.实证结果显示:长期来看,化石燃料能耗对碳排放的影响最大,经济增长、化石燃料能耗与碳排放成正相关关系,而金融发展与碳排放成负相关关系;短期来看,经济增长与金融发展、化石燃料能耗与碳排放、金融发展与碳排放之间存在着单向的格兰杰因果关系.最后,本研究分别从经济增长、能源消耗以及金融发展三方面给出改善环境质量的政策建议.