longer imagine

Some people can now no longer imagine life without their cell phones. The fact that they are so popular proves that they are useful and convenient. Cell phones enable people to easily and quickly communicate with one another; wherever you are, you can instantly reach somebody. Cell phones eliminate the　trouble of not being able to meet someone in person, and therefore increase business's efficiency. 　　Mobile phones necessarily also harbor disadvantages. The radiation such phones emit is hazardous to one's health. Furthermore, if people become too reliant on the use of cell phones, our face to face skills may decline. Any new invention has its drawbacks, and such negative aspects cannot always diminish its popularity. Despite the negative effects of television, for example, the number of people who own televisions continues to grow at a tremendous rate. This is also the case with mobile phones. People won't stop eating just because of the risk of choking. In addition, the swift development of science and technology will likely eliminate the hazards cell phones may cause. One can safely predict, therefore, that with the introduction of new techniques, mobile phones will have more applications and become even more appealing to customers.
the music of sadness
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the seagulls and the waves
Her wishful face
haunts my dreams
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under attack by insects or disease

Even plant can run a fever, especially when they’re under attack by insects or disease. But unlike human, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared （红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest problems.
　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color - coded map showing where plants were running“ fevers”. Farmers could then spot - spray, using 50 to 70 percent less pesticide than they otherwise would.
　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long - term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only ff Paley finds the financial backing which he failed to obtain 10 years ago.
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method

In order to conserve battery power in very dense sensor networks, usually we take such a method: some sensor nodes may be put into the sleep state while other lace wedding dresses sensor nodes remain active for the sensing and communication tasks. On the one hand, when the RF module is at work status, energy consumed is the highest. When it is in sleep status, energy consumed is the lowest. On the other hand, when all nodes are at work status and the density of the nodes is very high, a large number of unnecessary energy will be consumed and data collected sell discount wedding dresses will be highly relevant. Nodes in the same region will cause the conflict of data packets when they compete for channels. So the scheduling problem becomes inevitable.First of all, this thesis makes a comparison among the random sleep scheduling algorithm, the random sleep scheduling algorithm based on the blog new shirts 2010 information of neighbor nodes and the random sleep scheduling discount wedding gowns algorithm based on the energy of the nodes by MATLAB simulation tool.Secondly, this thes is introduces the cyclic cellular automata theory on the basis of these algorithms, describes in detail two cyclic cellular automata models: the G-H model in the integer domain and the G-H model in the real domain and is simulated by cheap jeans shop MATLAB tool. Then the thesis compares the differences between the cyclic cellular automata and the random sleep scheduling algorithm. It is concluded that when the demand of the coverage of the networks is not very strict, the cyclic cellular automata is a well way to improve the life of the networks.Finally, based on IEEE 802.15.4/ZigBee standards and SoC technology, this thesis selects the CC2430 which is made in Chipcon Company as a micro-chip RF transceiver and starts to design the hardware of the node. The article describes in detail the overall design idea, as well as the circuit design process of sub-modules. After the implementation of the hardware platform, this thesis sets up the development environment and lays a foundation for further work.
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