Fire science for rainforests

Forest fires are growing in size and frequency across the tropics. Continually eroding fragmented forest edges, they are unintended ecological disturbances that transcend deforestation to degrade vast regions of standing forest, diminishing ecosystem services and the economic potential of these natural resources. Affecting the health of millions, net forest fire emissions may have released carbon equivalent to 41% of worldwide fossil fuel use in 1997-98. Episodically more severe during El Ni?o events, pan-tropical forest fires will increase as more damaged, less fire-resistant, forests cover the landscape. Here I discuss the current state of tropical fire science and make recommendations for advancement.     

双供电路灯调光节能技术研究

介绍了一种基于太阳能和市网供电相结合的双电源供电的调光节能技术,采用SPWM控制方式和新型桥式整流逆变电路,可按照环境和用户需要自动调节汞灯的发光强度,具有节能效果明显、输入电流的死区范围小、起辉时间短、发光效率高等特点。     

让科学更好地"运行"

一年一度的"两会"中国总理记者招待会一直是倍受世界媒体期待的精彩环节.3月14日上午,温家宝总理在回答中外记者提问中,提出"中国的振兴不单在经济总量,而根本在人才和科技进步.我以为有两个数字比GDP更为重要,一是教育经费占国民经济的比重;一是研发经费占生产的比重,这两条就决定了我们这个民族和国家的创新力量."这段话以其特有的份量,随即占据了各大媒体的重要版面.