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Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that instead of feeding the dog or making garden compost(混合肥料) ,organic household waste could top up your home’s electricity. Although such "microbial fuel cells" (MFCs)have been developed in the past, they have always proved extremely inefficient and expensive. Now Chris Melhuish and technologists at the University of the West of England(UWE)in Bristol have come up with a simplified MFC that costs as little as ￡10 to make. Right now, their fuel cell runs only on sugar cubes, since these produce almost no waste when broken down, but they aim to move on to carrot power. "It has to be able to use raw materials, rather than giving it a refined fuel," says Melhuish. Inside the Walkman-sized battery, a colony of E. coil bacteria produce enzymes that break down carbohydrates, releasing hydrogen atoms. The cell also contains chemicals that drive a series of redox, or reduction and oxidation reactions, stripping electrons from the hydrogen atoms and delivering them steadily to the fuel cell’s anode(正极). This creates a voltage that can be used to power a circuit. To prove the MFC works, the researchers are using it to power a small light-sensitive robot. And when a number of the cells are connected in series, they could power domestic appliances, running a 40-watt bulb for eight hours on about 50 grams of sugar. Earlier MFCs were inefficient because they relied on energy-hungry filters and pumps. By experimenting with different anode materials, the UWE team have figured out how to make their system work: they dump the bacteria and redox chemicals directly into the cell. In its current form, the UWE team says its organic battery can produce eight times as much power as any previous MFC. But Melhuish wants to improve this, both by scaling it up and finding a better mix of redox chemicals. According to Melhuish, his present MFC ______.
某社区属于新兴城区，社区居民大都住在新建商品房内。因此，社区居民互不相识，对社区的事务漠不关心，特别是其中的清江小区，因为业主委员会基本处于瘫痪状态，无法对小区物业公司形成有效的监督，使得该小区在卫生清洁、保安、汽车停放等方面存在诸多问题，一些居民采用拒交物业费的方式表达对物业的不满，双方的矛盾越积越深。社会工作者王某被机构安排至该社区工作，第一天就接到清江小区居民反映物业的情况。王某用了三天的时间和小区相关各方进行接触，在了解基本情况的基础上，决定采用地区发展模式开展社区工作，并将最重要的发展目标确立为( )。
根据传统房地产周期理论，房地产市场的发展呈现出一种循环的模式。 ( )
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