伊朗核危机与中国石油安全

伊朗核危机中,伊朗凭借其地缘、能源“优势”大力开展“政治性能源外交”,与美国展开“能源博弈”,这一状况将对中国的石油安全造成一定的影响。为了突破能源“困境”,中国需要做出一些“战略性”的政策调整。     

Role of informal sector recycling in waste management in developing countries

Many thousands of people in developing country cities depend on recycling materials from waste for their livelihoods. With the focus of the Millennium Development Goals on poverty reduction, and of waste strategies on improving recycling rates, one of the major challenges in solid waste management in developing countries is how best to work with this informal sector to improve their livelihoods, working conditions and efficiency in recycling.The general characteristics of informal recycling are reviewed, highlighting both positive and negative aspects. Despite the health and social problems associated with informal recycling, it provides significant economic benefits that need to be retained. Experience shows that it can be highly counterproductive to establish new formal waste recycling systems without taking into account informal systems that already exist. The preferred option is to integrate the informal sector into waste management planning, building on their practices and experience, while working to improve efficiency and the living and working conditions of those involved. Issues associated with integrating informal recycling into the formal waste management sector are discussed.     

等温输油管线设计技术经济分析

本文从费用最省的角度出发,建立了计算等温输油管线最优技术参数的数学模型,并给出了数学模型的求解方法。     

我国海上油田钻井完井投资测算方法研究

本文分析了我国海上油田钻井完井投资测算的现有方法,针对存在的问题和不足,从内生变量的选择、相关系数、变量的影响程度等方面进行分析研究,提出以作业周期、井深、水深三个因素进行测算的新方法。     

试析中国与沙特阿拉伯的石油合作

沙特阿拉伯是世界第一大原油生产国和出口国,中国是世界第二大石油消费国和消费量增长最快的石油进口国.沙特需要为其巨大的能源储量寻找新的市场,中国需要海外能源满足经济增长的需要.因此,两国在能源领域存在着相互依赖关系.正是这种相互依赖关系推动着中沙关系的稳步发展,本文力图运用政治经济学的分析法对中沙石油合作做出理性分析与判断.     

华北根据地1940年代初期对浪费现象的改造

1940年代,华北根据地出现严重困难局面。与此相对照,浪费现象在华北各根据地普遍存在着。为根除这一现象,中共采取了多种措施。这些措施的推行,在当时对肃清浪费现象、倡导节约之风起到了重要作用,对当今政府反对浪费、倡导勤俭也有重要启示。     

中美中东石油关系解析

作为居世界前两位的石油进口和消费大国,中美都离不开中东石油。中美在中东必然因石油而发生关系,这种关系具有双重性——事实上的竞争与合作关系。在中东石油领域,如果两国展开过度竞争甚至恶性竞争,双方可能走向“零和”或两败俱伤的“负数”结局;如果两国开展对话、合作或实现竞争下的合作,则完全可以在中东石油甚至其他能源领域实现互利双赢。     

开展海外能源合作,确保中国石油供应

中国的石油需求增长迅速已成为世界性共识.在国内资源条件不理想的情况下,中国的最佳选择是,积极开展海外能源合作,以确保石油供应.各种因素表明,中东产油国应是中国的首选合作方.在开展海外能源合作,与一些主要的石油生产国或石油输出国互动时,既要重视提高海外能源运输的安全系数,也应以积极、友善的姿态,与周边邻国合作,构建亚洲石油供应保障体系.     

Vehicle routing–scheduling for municipal waste collection system under the “Keep Trash off the Ground” policy

This paper investigates the waste collection problem and characterizes the problem as a set-covering and vehicle routing problem (VRP) complicated by inter-arrival time constraints. The study proposes a bi-level optimization formulation to model the split delivery VRP with multiple trips to determine the minimum-distance route. The first stage optimally plans the collection points that cover all residential blocks. The second stage applies a heuristics method to solve the minimum vehicles used and minimum distance traveled for collecting residential waste. This research contributes to model this period VRP and to introduce the heuristics method to solve the problem efficiently. The study is important in laying the groundwork for understanding the possibility of improving the service level of municipal solid waste collection.     

现行成品油定价机制背后的税利博弈简

自成品油定价机制改革以来,成品油定价机制饱受争议,油价一直是人们关注的焦点。分析了国内需求拉动和国际输入型价格变动是引起油价上涨的主要原因;油价变动对用油企业、个人及产油企业的影响。随着我国国内成品油需求量日益增加,引发用油企业、个人及产油的上游企业与下游企业以及国家各方不断进行利益博弈,提出只有通过国家税收政策经济杠杆的调节作用,才能逐步调整各方利益及分配关系。