光合作用实验方法的改进

初中生物验证绿色植物在光下制造淀粉的实验,所用的实验材料是天竺葵(俗称臭海棠),这当然是一种很好的实验材料.但是,天竺葵作为一种观赏植物,它的栽培并不十分广泛,很多中学特别是农村中学,由于找不到它,或者其它各种原因而放弃了该实验,故使本来比较简单而实验效果十分明显的必做项目变成了“讲”实验、“背”实验.笔者经过探索,选用大豆和其它大田作物进行实验,也收到了良好的效果,现介绍如下:

Design and Implementation on the Wind and Light Complementary LED Lighting Controller based on Novel Base Board Packaging Technology

In this paper, we conduct theoretical research on design and implementation on wind and light complementary LED lighting controller based on the novel base board packaging technology. LED, as a kind of device can convert electric power into visible light directly the homomorphism of semiconductor devices, with high efficiency and small energy consumption, good light quality, use safety, long service life, green environmental protection, flexible control as this is common lamps and lanterns is incomparable advantage. Therefore, it is considered to be 21 century of a new generation of lighting source. Based on the superiority of LED, it is widely applied in many fields of lighting. To enhance the traditional solar based pure LED system, we enhance it with the combination of the wind power and the optimized controller that holds specific meaning.

绚丽多彩纸服装——可爱的"小蜜蜂"

您是否觉得宝宝平时穿的衣服太普通、太缺乏创意呢?新的一年开始啦!让我们换一种心情,自已动手,用身边最普通的材料给宝宝制作一件与众不同的衣服吧。 材料准备:黄色皱纹纸、黑色电光纸、废旧报纸、双面胶带、硬纸板、彩色蜡笔。