火星表面真的有冰

美国宇航局2008年6月20日宣布，“凤凰号”火星登陆器在登陆前和登陆后对同一区域拍摄的照片证明，火星上确实存在冰。在拍摄于6月15日的左图中，在左下角的“雪白沟”中明显可见硬币大小的明亮屑状物。而在6月19日拍摄的右图中，这些明亮物质却消失了。科学家们确信，这些明亮物质正是冰，但是在“凤凰号”的机械臂对这些物质进行挖掘后，冰蒸发掉了。“凤凰号”当时一直在探测火星北极地区是否存在冰。     

抗生素生产废水处理技术

<正>抗生素废水是一类含难降解物质和生物毒素物质的高浓度有机废水,国内300多家企业生产占世界产量20%～30%的70多个品种的抗生素,废水排放量大,水体污染严重。目前国内外应用的处理技术不多且不够成熟,已建成的以好氧处理技术为主的工程,投资处理成     

浅谈消费心理对包装设计的影响

随着物质文化生活水平的提高,人们的消费观念也在不断地发展。人们不再只满足温饱的生活,而对商品越来越挑剔。今天的时尚,可能明天就会过时。所以商品的销售包装必须不断改进,在继承传统     

An Empirical Research on the Evolution Model of Competitiveness Between Different Life Cycle Stages in Chinese Enterprises

The characteristic of enterprise competitiveness is different between different life cycle stages. In this paper we surveyed the enterprise competitiveness＇s differences in various stages of the life cycle and the evolution model of three aspects of enterprise com- petitiveness as resource, capability and dynamic capability by questionnaire survey. The result shows that there are significant differences between different life cycle stages of en- terprise competitiveness in China. The enterprise competitiveness is stronger and stronger during the periods from the enterprise＇s birth to maturity, while in the enterprise＇s recession period the competitiveness becomes much weaker. The competitiveness＇s constitutive features in each stage are as follows： in the enterprise＇s born stage the enterprise is lack of resources and its competition mainly relies on the ability; in the enterprise＇s growth stage the enterprise＇s resources become richer and are as important as enterprise＇s ability in the constitution of enterprise competitiveness; in the maturity stage the enterprise＇s people, money and material resources all become very rich but the role of capability in enterprise competitiveness begins to decrease; in the enterprise＇s recession stage the en- terprise resources begin to exhaust, and the enterprise＇s competitiveness returns to rely on capability, and in this period the enterprise＇s learning ability, innovation ability and dynamic mechanisms perform worst, which will affect the enterprise＇s revival and lead to the ultimate death of enterprise. These conclusions have great value for reference to the enterprise＇s competitive strategy making for different life cycle stages.     

提高沼气池产量的几点措施

近年来，农村沼气建设快速发展．但普遍存在着家用沼气池效益偏低、产气量全年分布不均衡等问题。针对这些问题，应采取以下几种措施： 1．沼气池发酵千物质浓度。所谓发酵干物质就是指人畜粪便及秸秆。沼气池发酵干物质浓度、温度是决定产气量大小的主要因素。     

浅谈校园绿化养护后勤服务与管理

绿化为一所高校提供的不仅仅是具有生态意义上的树木花草种植，更是通过不同树木的组合，形成了特定的学校第二课堂，为创造人性化校园提供了重要的物质环境。校园绿化的重要性已为广大师生所共识。但校园绿化普遍存在着重建设轻管理的现象，充分认识绿化养护的重要性，切实做好绿化养护工作已成为校园绿化工作的当务之急。     

场r的矛盾性

揭示了“场ｒ”的矛盾性， 论述了在实际应用中怎样正确看待场ｒ ， 提出清除相关混沌现象的方法     

英国发明太阳能风帆游艇

英国国内最先进的绿色游艇在伦敦的海德公园湖下水。它的特色是安装有太阳能风帆,主要依靠太阳能来推动,同时也利用风能,不会排放任何污染物质,非常环保。     

不易碎裂的金属陶瓷

日本物质材料科研机构与东京大学尖端技术研究中心的香川丰教授在一项共同研究中发现。以陶瓷、玻璃为代表的金属陶瓷经过特殊加工．其表面受力时会像金属一样凹陷。按常识，金属陶瓷受到一定的外力就会碎裂，而由两种成分的微细网重叠起来的金属陶瓷就会显现出金属的延展性。从而有望用于不易碎裂的新材料的开发。