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Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第2期11卷 106-114页

作者： Bülent ZDALYAN oguzhan dogan Department of Automotive Education Karabuk UniversityKarabuk 78050Turkey

In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively.

关键词： Semi electro-mechanic Camless engine Electro-mechanic engine valve Engine performance Emissions

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Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第8期 619-619页

作者： Bülent ZDALYAN oguzhan dogan

In this study,an electro-mechanical valve(EMV) system for the intake valve of a four stroke,single cylinder,overhead valve and spark ignition(SI) engine was designed and *** engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full *** EMV engine showed improved engine power,engine torque and break specific fuel consumption(BSFC).A 66% decrease in CO emissions was also obtained with the EMV system,but hydrocarbons(HC) and NO x emissions increased by 12% and 13% respectively.

关键词： EMV In this SI Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

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Combined Single Step Definitive Treatment in Acute Pilonidal Sinus Abscess Running Head: Single Step Treatment of Pilonidal Abscess

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Surgical Science 2010年第1期1卷 24-26页

作者： dogan Yildirim oguzhan Sunamak Ahmet Pergel Mourad Mounla 不详

Backgrounds: The treatment of choice has been drainage and definitive surgical treatment after an interval for acute pilonidal sinus abscess till now. Because of the high incidence of chronic pilonidal sinus disease following drainage and aiming the cure in one step, synchronous treatment choices to drainage have been attempted recently. We analyzed retrospectively 20 patients with pilonidal sinus abscess on whom we carried out drainage+ marsupialization as singlestep treatment. Methods: Drainage+ synchronous marsupialization results of 20 patients (17 male, 3 female) between 20 to 37 years of age (mean 28) were analyzed retrospectively on the parameters of operation time, recovery period, time to workreturn and recurrence ratios. Results Operation times were between 15 to 25 minutes. Mean recovery period was 45 days (3050 days), the mean period from operation to workreturn was 24 (2230) days. There were full recovery in 18 patients (90%) and recurrence in 2 patients (10%). Silver nitrate ablation treatment achieved cure in recurrences. Conclusion: Drainage+ Marsupialization is an applicable and successful combined choice in the treatment of Pilonidal sinus abscess.

关键词： Pilonidal Sinus Abscess Drainage Marsupialization Definitive Treatment Combined Treatment

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