Optofluidic planar reactors for photocatalytic water treatment using solar energy

Optofluidics may hold the key to greater success of photocatalytic water treatment. This is evidenced by our findings in this paper that the planar microfluidic reactor can overcome the limitations of mass transfer and photon transfer in the previous photocatalytic reactors and improve the photoreaction efficiency by more than 100 times. The microreactor has a planar chamber (5 cm×1.8 cm×100 μm) enclosed by two TiO(2)-coated glass slides as the top cover and bottom substrate and a microstructured UV-cured NOA81 layer as the sealant and flow input∕output. In experiment, the microreactor achieves 30% degradation of 3 ml 3×10(-5)M methylene blue within 5 min and shows a reaction rate constant two orders higher than the bulk reactor. Under optimized conditions, a reaction rate of 8% s(-1) is achieved under solar irradiation. The average apparent quantum efficiency is found to be only 0.25%, but the effective apparent quantum efficiency reaches as high as 25%. Optofluidic reactors inherit the merits of microfluidics, such as large surface∕volume ratio, easy flow control, and rapid fabrication and offer a promising prospect for large-volume photocatalytic water treatment.     

A diagnostic assessment for introductory molecular and cell biology

We have developed and validated a tool for assessing understanding of a selection of fundamental concepts and basic knowledge in undergraduate introductory molecular and cell biology, focusing on areas in which students often have misconceptions. This multiple-choice Introductory Molecular and Cell Biology Assessment (IMCA) instrument is designed for use as a pre- and posttest to measure student learning gains. To develop the assessment, we first worked with faculty to create a set of learning goals that targeted important concepts in the field and seemed likely to be emphasized by most instructors teaching these subjects. We interviewed students using open-ended questions to identify commonly held misconceptions, formulated multiple-choice questions that included these ideas as distracters, and reinterviewed students to establish validity of the instrument. The assessment was then evaluated by 25 biology experts and modified based on their suggestions. The complete revised assessment was administered to more than 1300 students at three institutions. Analysis of statistical parameters including item difficulty, item discrimination, and reliability provides evidence that the IMCA is a valid and reliable instrument with several potential uses in gauging student learning of key concepts in molecular and cell biology.     

编辑部主角

花美男海平 所谓花样美男就是每天会细心打扮自己,同时相当注意个人形象又有点自恋的人男人,编辑部里就有这样一个同事--海平。只见此人留着利落的板儿寸,发丝打理得根根分明;戴着金边眼镜,镜片擦得锃光瓦亮,     

不同版本的版主的就职宣言

"手机小强"的版主宣言: 我管事儿啦、管事儿啦,我想破脑袋都不知道怎么升官啦.我一会儿告诉我老妈,然后告诉整个天下.我亲戚、朋友、债主子,挨个去发贺卡儿.我加完精品再踩它,把论坛折腾出花儿.     

世界上最干净的河流

你知道吗,恒河,被誉为“世界上最干净的河流”。
　　瓦纳那西是恒河沿岸最大的圣城,一辈子能到圣城住一次,是大部分印度人的心愿。这里原被叫作“加西”,意为“神光普照”。在瓦纳那西域内的恒河全长六七公里,沿线有64个台阶码头。     

“美丽重视”大餐

细腻的肌肤是美丽的必备条件。然而生了宝宝的你摸着自己略显粗糙的皮肤，只能对镜兴叹“红颜易老”。现在我们就为你解心结，特奉送美颜套餐一款，还你明亮细嫩的肌肤，让你即使不上妆也靓丽迷人，真真切切做一个现代俏妈咪！     

美味大虾一起做

虾含有丰富的蛋白质及其分解产物,具有特殊的鲜美滋味,无论你用哪种烹调方法,都能制成令人垂涎的美味佳肴,哪怕是只用开水煮一下也鲜美无比。大虾还有一大优点——没有鱼刺和腥味。因此木期“新滋味”栏目特为妈咪们推荐一组色香味俱全的美味大虾。为你自己,也为宝宝一起来做吧！     

阿花洗澡

阿花是只小懒狗,睡到太阳照屁股了才摇摇摆摆地伸个懒腰起床来。哈,昨天和笨笨打架抢回来一根大骨头。啊,居然是个大晴天!天气真不错,好舒服呀!真刺激,就像上了天的感觉!我被染成了一只土黄色的狗,很影响形象的。下雨了!差不多都洗干净了呢!啊,出太阳了。啊!我能呼风唤雨呢。这样洗澡真好!阿花不知道夏天经常会突然下起雨来,也不知道经常突然就会雨过天晴。但阿花决定明天还要来洗澡,做只爱干净的小花狗。想到这里,沐浴在阳光中的阿花露出了憧憬的微笑。E nd啊￣阿花洗澡@阿转 @小Q     

俏妈咪挑战有氧运动

有氧运动是指将大量的氧气吸入体内,以达到锻炼心脏、肺和血管等目的的运动,它还具有减少体内的脂肪,改善身体组成的效果。     

最酷动漫小子

有趣的动漫,酷(ku)酷的主人公,我们爱看那些跌宕(dang)精彩的探索故事,更喜欢里面那些有个性的酷小子,虽然不再是言听计从的乖乖宝,但智勇双全、勇于冒险的他们赢(ying)得了更多的喝彩。