The test results in figure 3 for small document collections show that gzip compression works much better for larger documents than for small ones 圖3中對小型文檔集合的測試結果表明, gzip對較大文檔的壓縮要比小型文檔好得多。
Simulation results show that wet compression can be used to cool compressors and gas turbines , when this technology is used , compression work consumed is lowered and engine power output increases and even more , compression work can be less than isentropic dry compression work 計算結果表明:濕壓縮可以被用來進行有效的冷卻,減少壓縮功,增加渦輪輸出功;而且濕壓縮的壓縮功有可能比等熵干壓縮的壓縮功還要少。
Thermodynamic analysis on wet compression process is done in this thesis and studies are done on ideal wet compression process , actual wet compression process , water droplet evaporative rate , wet compression work , inlet evaporative cooling , wet compression efficiencies and water droplet breaking . and thermodynamic model of wet compression process is established , which gives out rules of and methods to calculate wet compression parameters 本文從熱力學的角度對濕壓縮過程進行了分析,分別對理想濕壓縮過程、實際濕壓縮過程、水滴的蒸發速率、濕壓縮功、進氣蒸發冷卻、濕壓縮效率和水滴的破碎等進行了研究,建立了濕壓縮過程的熱力學模型,給出了濕壓縮過程狀態參數的變化規律和計算方法。
Experimental studies on s1a - 02 gas turbine with water injection into compressor interstage / inlet as well as that on turbocharger self - loop test rig with inlet water injection are introduced . test results are in good accordance with simulation results , wet compression can lower compression work and increase engine power output so engine performance is enhanced , if engine power output is not changed , efficiencies of compressor and this engine become higher and turbine inlet temperature and fuel consumption become lower and if keeping t4 the same as that before wet compression is used , efficiencies become furthermore higher and engine power output increases greatly 實驗結果和計算結果同樣表明:濕壓縮減少了壓氣機所消耗的壓縮功,增加了燃氣輪機的輸出功率,提高了燃氣輪機性能,如果保持發動機輸出功率恒定,濕壓縮可以提高壓氣機和整個燃氣輪機機組的效率,與此同時,渦輪進口溫度t _ 3 ~ *和燃油消耗率下降;如果保持渦輪排氣溫度t _ 4 ~ *恒定,壓氣機和燃氣輪機機組效率進一步提高,燃氣輪機輸出功率增加。
After analyzing jpeg image compression working principle , a remote visual surveillance system is constructed by combining dm642 developing platform with pc through the ethernet . at last , video coding , video decoding and network transmission are realized on the system in this thesis 本文深入細致地分析研究了jpeg圖像壓縮算法后,將dm642開發平臺通過ethernet和pc機相連,構成了遠程視覺監控網絡系統,并在此系統上實現了實時視頻的壓縮編碼、解碼以及網絡傳輸功能。