移动自组网中的安全问题研究

移动自组网是一种有特殊用途的对等式网络,具有无中心、自组织、可快速展开、可移动等特点,同时容易引发安全问题.本文在对移动自组网的历史发展、特点以及安全研究现状的总结和分析基础上,提出了移动自组网中现有路由协议面临的主要问题.     

巴固-德洛（中国）有限公司倾力相助清华大学公共安全研究工作

巴固-德洛（中国）安全防护设备有限公司最近向清华大学公共安全研究中心捐赠了价值30余万元人民币的个体防护装备、器材，用于该中心的教学及科研工作。     

事件

2007年世界环境日中国主题出炉；我国一季度环境质量状况不容乐观；三部门联合实施国家生态工业示范园区建设；泛珠合作圈定七大重点；     

Sustainable Development and Strategic Thinking

From an economic point of view, the industrial economy is efficient to overcome situations of a scarcity of goods. From a technological point of view, the resource efficiency of the manufacturing processes of the industrial economy has been permanently improved during the last 200 years. In addition, cleaner processes have been developed. However, from an ecologic point of view, an increasing world population with increasing consumption has produced a ＂global footprint＂ which approaches the carrying capacity of the planet. A circular economy and its high-value spin-offs-a lake economy and a performance or functional service economy-can fulfil customers＇ needs with considerably less resource consumption, less environmental impairment in production and considerably less end-of-life product waste, especially in situations of affluence, when a considerable stock of physical goods and infrastructures exists. Also, in situations of a scarcity of natural resources, both energy and materials, often characterised by rapidly rising resource prices, the economic actors of a circular economy have a high competitive advantage over the actors of the industrial economy, due to much lower procurement costs for materials and energy. From a social point of view, a circular economy increases the number of skilled jobs in regional enterprises. However, the shift from a linear manufacturing economy to a circular or service economy means a change in economic thinking from flow （throughput） management to stock （asset） management： in a manufacturing economy with largely unsaturated markets, total wealth increases through accumulation as resource throughput （flow） is transformed into a higher stock of goods of better quality （but in a manufacturing economy with largely saturated markets, wealth represented by the stock of goods will no longer increase）; in a circular or service economy, total wealth increases through a smart management of existing physical assets （stock） that are adapted to changes in both technology and customer demand. This second approach not only applies to physical capital but equally to social capital, such as health and education and green GDP. To measure the social wealth of a population, it is not the amount of money spent on schools and hospitals that matters, butif this expenditure has led to a better education of the students, and a better health of the people.     

全国安全生产宣传工作会议:张宝明局长谈今年工作总体思路

3月底全国安全生产宣传工作会议在北京西郊宾馆举行。这是国家安全生产监督管理体制改革以来,召开的第一次安全生产宣传工作会议。国家     

小断面锚网支护工作面上下隅角安全问题的探讨

利用事故树对小断面锚网支护方式下，上下隅角的安全问题进行了分析，求出了最小割集和基本事件的结构重要度，提出了防止事故的方案，并在现场应用中取得了良好的效果。     

战略环评,方兴未艾

按照国家“西电东送”规划,今后几年,云贵两省交界的狭长地带要新建十余座火电厂。而国内二氧化硫污染较重的城市安顺、都匀,恰好就在那里。很多人担忧,如此大规模地集中新建火电厂会不会给当地脆弱的生态环境雪上加霜。显然,针对单个电厂做的建设项目环境影响评价,很难从总体上把握建造十余座电厂对这一地区的环境将产生怎样的影响。为此,专家们为“西电东送”所作的环境影响评价,不是针对单个电厂,而是面向整个规划。国际上把这种对政策、规划进行的环境影响评价称为“战略环境影响评价”,简称“战略环评”。