国际安全新形势下的中国石油安全战略调整

我国处于工业化加速发展时期,目前石油消费量和原油产量分别占世界的8.92%和4.70%,而石油剩余探明可采储量仅占世界的1.44%。与高速发展的中国经济相比,国内资源不足。为适应非传统安全和传统安全交互作用下国际安全新形势和石油地缘政治新格局,中国迫切需要调整石油安全战略,即从利用国内资源为主向利用国外资源为主转变;从应对传统安全为主向应对非传统安全为主转变;从单纯预防石油供应中断,向既防止供应中断,又预防石油价格大幅度波动转变;从能源高耗型经济发展模式向节能节油型经济发展模式转变;从单纯的国际间竞争、甚至对抗解决争端向互利合作双赢转变。未来中国石油安全战略的构建主要包括以下8个方面:(1)保护性利用国内石油资源;(2)多元化利用国外石油资源;(3)多途径保障运输安全;(4)以科技创新支撑石油节约与替代;(5)建立以国家为主导的石油战略储备;(6)建立石油期货市场,参与全球油价博弈;(7)积极开展石油外交与国际合作,为我国获得长期、安全、稳定的资源,创造良好的国际环境;(8)建立中国石油安全预警系统,制定中国石油危机应急预案,以保障石油安全战略的顺利实施。     

Infrastructure,automation and model-based operation strategy in a stand-alone hydrolytic solar-hydrogen production unit

An autonomous power system that exploits solar energy for the production of hydrogen through water electrolysis is fully assessed in terms of system implementation and optimal operating strategy. A 10 kW_p photovoltaic array supplies energy to a PEM electrolyzer rated at 6.9 kW_p. In order to maintain a smooth operation regardless of the inherent weather fluctuations, a 1000 Ah/24 V lead–acid accumulator stores energy excess and provides it when needed. The monitoring and control of the system is implemented through a Supervisory Control and Data Acquisition system (SCADA), while the interactions between electrical and chemical subsystems are addressed by a complete automation infrastructure. The mathematical models of each subsystem are validated based on real operational data and a model-based power management strategy is proposed and assessed through a parameter sensitivity analysis. Further on, an off-line optimization framework is evaluated regarding the optimal operation of the system in two diverse, but representative time periods. The optimal parameters are identified and their effect on hydrogen production and accumulator utilization is reported.     

浅淡生态城市规划设计

生态城市建设在我国已取得了一定成绩,但仍存在不足。在此背景下,本文分析了我国生态城市规划设计中存在的问题,并有针对性地提出了我国生态城市发展策略。     

基于模型诊断的研究进展

通过对诊断对象模型、主要诊断方法和聚焦策略的分析和阐述,系统地总结和综述了近年来基于模型诊断的主要研究内容和方法,介绍和比较了3组诊断对象模型,即定性与定量模型、静态与动态模型、确定与概率模型,并针对近几年的研究热点,重点阐述了分布式系统和2类动态系统--时间驱动型系统和事件驱动型系统的相应诊断方法,同时分析了基于优先序的策略、基于删剪条件的策略、基于层次的策略和基于分治的策略这4类聚焦策略,最后对今后的主要研究方向进行了总结和展望.     

刍议计算机网络防御策略建设方法及模型优化方案

随着科学技术的发展,网络技术在人们日常生活中占据着越来越重要的作用,带给人们生活和工作很大便利与益处,然而,与此同时由于网络的安全问题日益突出,威胁着人们的财产安全以及人身安全,比如数据遭窃、木马病毒或者黑客入侵等,这给计算机网络安全防御系统带来了极大的挑战.所以如何在网络大环境下做好网络安全防御工作,保障人民财产安全是一个亟待解决的问题,也是当前困扰互联网技术人员的一个首要问题.本文就从计算机网络所受到的安全威胁入手展开对这一问题的探讨.     

A new approach for improved identification of measurement bias

This work presents a technique that can completely and accurately identify measurement bias in cases where it is not possible to use the method of Rollins and Davis (1992, 1993) and where the method of Narasimhan and Mah (1987) fail to perform accurately. This technique makes use of information contained in the relationship between individual measurements and the corresponding nodal imbalance. The performance of this method is demonstrated on a problem from the literature that has been difficult for other methods to handle. In addition, this article discusses how the new technique can be used as a visual monitoring tool for identifying biased measured variables.     

未来的企业战略选择

针对未来的挑战,论述了经济全球化、信息网络化和高科技的发展,提出了国内企业战略选择的三项对策及适应市场变化的企业内部改革举措。     

多管齐下,氧化铁行业冲破困境,再图新机

概述了国内氧化铁行业面对金融危机的冲击,利用多种举措充分挖潜、开发新品,在以人为本的方针下扭转行业颓势,步入健康发展的快车道的总趋势。     

从“华谊兄弟”模式看景德镇陶瓷经营业态未来的选择

将华谊兄弟演艺明星持股现象解读为＂现代企业＋演艺明星＂模式,并认为该模式具有一般性可将其推广到陶瓷行业领域,形成＂现代企业＋陶艺家＂模式。在此基础上,结合景德镇市情,提出若干建议。     

Oscillation Test Strategy: A Case Study

In this paper is proposed as a case study the test of a folded cascode operational amplifier using the Oscillation Test Strategy (OTS). This Operational Amplifier (OPA) is chosen in order to evaluate the ability of OTS to test a more complex amplifier than those previously reported. To obtain comparative results, three different types of single-OPA oscillators are employed.A catastrophic-fault injection procedure is carried out using SPICE. In all oscillators, simulation results show that the fault coverage obtained is lower than those previously obtained by many researchers for simpler amplifiers. This fact suggests that OTS might be inconvenient for applications using the OPA targeted in this work and requiring high fault coverage.