【精品】电力英语论文

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1、南京工程学院期末考查报告书电气工程专业外语B院（系、部、中心）电力工程学院电气工程及其自动化电气071赵程磊206070851朱建忠2010年7月南京成绩PagelProductionofElectricalEnergy（电能生产）31Englishtext32中文翻译及分析43长难句分析及专业词汇54屮心思想5Page2Electricalenergytransmission（电能输电）61Englishtext62中文翻译及分析83长难句分析及专业词汇94屮心思想9Page3Protectiverelays（继电）101Englishtext102中文翻译

2、及分析123长难句分析及专业词汇144屮心思想15Page4Motor（电动机）161Englishtext162中文翻译及分析193长难句分析及专业词汇214屮心思想22Page5报告体会23PagelProductionofElectricalEnergy(电能生产)1EnglishtextFromreferenceHydrogencanberecoveredbyfermentationoforganicmaterialrichincarbohydrates,butmuchoftheorganicmatterremainsintheformofacetat

3、eandbutyrate.Analternativetomethaneproductionfromthisorganicmatteristhedirectgenerationofelectricityinamicrobialfuelcell(MFC).Electricitygenerationusingasingle-chamberedMFCwasexaminedusingacetateorbutyrate.Powergeneratedwithacetate(800mg/L)(506mW/m2or12.7mW/L)wasupto66%higherthantha

4、tfedwithbutyrate(1000mg/L)(305mW/m2or7.6mW/L),demonstratingthatacetateisapreferredaqueoussubstrateforelectricitygenerationinMFCs.Poweroutputasafunctionofsubstrateconcentrationwaswelldescribedbysaturationkinetics,althoughmaximumpowerdensitiesvariedwiththecircuitload.Maximumpowerdensi

5、tiesandhalf-saturationconstantswerePmax=661mW/m2andKs=141mg/Lforacetate(218Q)andPmax=349mW/m2andKs=93mg/Lforbutyrate(1000Q).Similaropencircuitpotentialswereobtainedinusingacetate(798mV)orbutyrate(795mV).Currentdensitiesmeasuredforstablepoweroutputwerehigherforacetate(2.2A/m2)thantho

6、semeasuredinMFCsusingbutyrate(0.77A/m2).Cyclicvoltammogramssuggestedthatthemainmechanismofpowerproductioninthesebatchtestswasbydirecttransferofelectronstotheelectrodebybacteriagrowingontheelectrodeandnotbybacteria-producedmediators.Coulombicefficienciesandoverallenergyrecoverywere10

7、?31and3?7%foracetateand8?15and2?5%forbutyrate,indicatingsubstantialelectronandenergylossestoprocessesotherthanelectricitygeneration.Theseresultsdemonstratethatelectricitygenerationispossiblefromsolublefermentationendproductssuchasacetateandbutyrate,butenergyrecoveriesshouldbeincreas

8、edtoimprovetheovera