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There are 27 user-controllable LEDs on the DE2-70 board. Eighteen red LEDs are situated above the 18 toggle switches, and eight green LEDs are found above the pushbutton switches (the 9th green LED is in the middle of the 7-segment displays). Each LED is driven directly by a pin on the Cyclone II FPGA; driving its associated pin to a high logic level turns the LED on, and driving the pin low t
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小一型和小二型水庫的飲用水水源地,對(duì)當(dāng)?shù)氐某青l(xiāng)居民生產(chǎn)生活具有十分重要的意義。本文以重慶市彭水縣的葡萄水庫為例,對(duì)水庫周邊現(xiàn)有污染狀況進(jìn)行調(diào)查分析,結(jié)合水資源保護(hù)與生態(tài)學(xué)等相關(guān)理論,提出葡萄水庫飲用水源地岸邊植被帶的方案設(shè)計(jì)。針對(duì)水源地集雨面積內(nèi)的農(nóng)田、散養(yǎng)牲畜、生活垃圾、生活污水等帶來的污染現(xiàn)狀,合理布置岸邊植被帶是緩解污染,涵養(yǎng)水源的一種有效措施,對(duì)水庫水生態(tài)修復(fù)和保護(hù)具有一定的推動(dòng)作用,對(duì)重慶市類似的飲用水水源地的保護(hù)和管理也能有一定的指導(dǎo)作用。