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pollution

  • Wi-Fi pollution, or an excessive number of access points in the area, especially on the same or neig

    Wi-Fi pollution, or an excessive number of access points in the area, especially on the same or neighboring channel, can prevent access and interfere with the use of other access points by others, caused by overlapping channels in the 802.11g/b spectrum

    標(biāo)簽: especially pollution excessive the

    上傳時(shí)間: 2017-07-29

    上傳用戶:我們的船長

  • Active Filters

    Power conversion by virtue of its basic role produces harmonics due to theslicing of either voltages or currents. To a large extent the pollution in theutility supply and the deterioration of the power quality has been generatedor created by non-linear converters. It is therefore ironic that power convertersshould now be used to clean up the pollution that they helped to create inthe first place.In a utility system, it is desirable to prevent harmonic currents (which resultin EMI and resonance problems) and limit reactive power flows (whichresult in transmission losses).Traditionally, shunt passive filters, comprised of tuned LC elements andcapacitor banks, were used to filter the harmonics and to compensate forreactive current due to non-linear loads. However, in practical applicationsthese methods have many disadvantages.

    標(biāo)簽: Filters Active

    上傳時(shí)間: 2013-11-05

    上傳用戶:AISINI005

  • 基于C8051F930的管道溫度壓力遠(yuǎn)程監(jiān)測系統(tǒng)

       為解決輸油管道溫度壓力參數(shù)實(shí)時(shí)監(jiān)測的問題,設(shè)計(jì)了以C8051F930單片機(jī)作為控制核心的超低功耗輸油管道溫度壓力遠(yuǎn)程監(jiān)測系統(tǒng)。現(xiàn)場儀表使用高精度電橋采集數(shù)據(jù),通過433 MHz短距離無線通信網(wǎng)絡(luò)與遠(yuǎn)程終端RTU進(jìn)行通信,RTU通過GPRS網(wǎng)絡(luò)與PC上位機(jī)進(jìn)行遠(yuǎn)程數(shù)據(jù)傳輸,在上位機(jī)中實(shí)現(xiàn)數(shù)據(jù)存儲和圖形化界面顯示,從而實(shí)現(xiàn)輸油管道溫度壓力參數(shù)的實(shí)時(shí)監(jiān)測和異常報(bào)警。經(jīng)實(shí)驗(yàn)證明,該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設(shè)計(jì)要求,漏碼率小于1%,正常工作時(shí)間超過5個(gè)月,能實(shí)時(shí)有效地監(jiān)測輸油管道的溫度壓力參數(shù),節(jié)省大量人工成本,有效預(yù)防管道參數(shù)異常造成的經(jīng)濟(jì)損失和環(huán)境污染。 Abstract:  In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters, the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection, the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU, the GPRS was used by the RTU to transmit data to the PC host computer, and the data was stored and displayed in the PC host computer, so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time, it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.

    標(biāo)簽: C8051F930 溫度 壓力 遠(yuǎn)程監(jiān)測系統(tǒng)

    上傳時(shí)間: 2013-11-07

    上傳用戶:cuibaigao

  • driver program which uses the above two modules. I have also made available the data set pollute.dat

    driver program which uses the above two modules. I have also made available the data set pollute.dat of mortality rates against socio-economic, meteorological and pollution variables for 60 statistical areas in the USA.

    標(biāo)簽: available the program modules

    上傳時(shí)間: 2017-07-28

    上傳用戶:wff

  • Multiscale+Simulation+Approach

    Battery systems for energy storage are among the most relevant technologies of the 21 st century. They – in particular modern lithium-ion batteries (LIB) – are enablers for the market success of electric vehicles (EV) as well as for stationary energy storage solutions for balancing fluctuations in electricity grids resulting from the integrationofrenewableenergysourceswithvolatilesupply 1 .BothEVandstationary storage solutions are important because they foster the transition from the usage of fossil energy carriers towards cleaner renewable energy sources. Furthermore, EV cause less local air pollution and noise emissions compared to conventional combustion engine vehicles resulting in better air quality especially in urban areas. Unfortunately, to this day, various technological and economic challenges impede a broad application of batteries for EV as well as for large scale energy storage and load leveling in electricity grids.

    標(biāo)簽: Multiscale Simulation Approach

    上傳時(shí)間: 2020-06-07

    上傳用戶:shancjb

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