FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising g...FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising gases namely oxygen, nitrogen and 25% hydrogen/75% nitrogen gas mixture were used for the plasma treatment of wool fabric. The oxidation products of cystine studied included S-sulphonate, cysteic acid, cystine monoxide and cystine dioxide. The variations of the amount of these products as a function of treatment time were studied. Experimental results showed that the oxygen plasma could produce a large amount of oxidation products of cystine on the wool fabric surface followed by nitrogen plasma and gas mixture plasma.展开更多
The wear resistance of austenitic stainless steels can be improved by thermo-chemical surface treatment with nitrogen and carbon. However, it is possible that the corrosion resistance will be impaired by the precipita...The wear resistance of austenitic stainless steels can be improved by thermo-chemical surface treatment with nitrogen and carbon. However, it is possible that the corrosion resistance will be impaired by the precipitation of chromiumnitrid or -carbide. The present contribution deals with investigations of the corrosion behaviour and structural characteristics of a low temperature nitrided and carburised austenitic stainless steel. The material investigated was AISI 316L (X2CrNiMol7-12-2) austenitic stainless steel. A commercial plasma-nitriding unit (pulsed dc) was used for the nitriding and carburising process. Additional samples were treated by the gasoxinitriding process for a comparison between plasma- and gasoxinitriding. The nitrided and carburised layer of austenitic stainless steel consists of the nitrogen or carbon S-phase (expanded austenite), respectively. X-ray diffraction investigations show the typical shift of the peaks to lower angles, indicating expansion of the fee lattice. Also the X-ray diffraction technique was employed to study the residual stresses in the nitrogen and carbon S-phase. The corrosion behaviour of surface engineered samples was investigated with electrochemical methods. Anodic potentiodynamic polarisation curves were recorded for testing the resistance against general corrosion (in H2SO4) and pitting corrosion (in NaCl).展开更多
低温等离子灭菌是医院常用的一种医疗器械灭菌技术,尤其适用于一些热敏材料医疗器械的处理,可解决其灭菌、消毒方面困难的问题,可为临床医疗器械的正常应用提供有效支持。本研究主要介绍了舱门无法正常关闭、设备取消程序后不能正常开...低温等离子灭菌是医院常用的一种医疗器械灭菌技术,尤其适用于一些热敏材料医疗器械的处理,可解决其灭菌、消毒方面困难的问题,可为临床医疗器械的正常应用提供有效支持。本研究主要介绍了舱门无法正常关闭、设备取消程序后不能正常开门的故障,通过逐步排查法层层分析最终确定故障点位于Pwa ss relay板和I/O数字电路板以及舱门传感器,最终通过更换元器件的方法排除了故障。本文通过对STERRAD 100S低温等离子灭菌器舱门相关的2例故障的排除方法进行分析,可为相关维修工程师提供一定的参考,具有借鉴意义。展开更多
This study aimed to discuss the removal of hydrogen sulfide （H2S） with non-thermal plasma produced by a multilayer tubular dielectric barrier discharge reactor,which is useful in the field of plasma environmental ap...This study aimed to discuss the removal of hydrogen sulfide （H2S） with non-thermal plasma produced by a multilayer tubular dielectric barrier discharge reactor,which is useful in the field of plasma environmental applications.We explored the influence of various factors upon H2S removal efficiency （ηH2S） and energy yield （Ey）,such as specific energy density （SED）,initial concentration,gas flow velocity and the reactor configuration.The study showed that we can achieve ηH2S of 91% and the best Ey of 3100 mg kWh-1 when we set the SED,gas flow velocity,initial H2S concentration and layers of quartz tubes at 33.2 J 1-1,8.0 m s-1,30 mg m-3 and five layers,correspondingly.The average rate constant for the decomposition of hydrogen sulfide was 0.206 g m-3 s-1.In addition,we also presented the optimized working conditions,byproduct analysis and decomposition mechanism.展开更多
文摘FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising gases namely oxygen, nitrogen and 25% hydrogen/75% nitrogen gas mixture were used for the plasma treatment of wool fabric. The oxidation products of cystine studied included S-sulphonate, cysteic acid, cystine monoxide and cystine dioxide. The variations of the amount of these products as a function of treatment time were studied. Experimental results showed that the oxygen plasma could produce a large amount of oxidation products of cystine on the wool fabric surface followed by nitrogen plasma and gas mixture plasma.
基金The DFG(Deutsche Forschungsgemeinschaf)is gratefully acknowledged for the financial support(DFG-BI 418/9-1).
文摘The wear resistance of austenitic stainless steels can be improved by thermo-chemical surface treatment with nitrogen and carbon. However, it is possible that the corrosion resistance will be impaired by the precipitation of chromiumnitrid or -carbide. The present contribution deals with investigations of the corrosion behaviour and structural characteristics of a low temperature nitrided and carburised austenitic stainless steel. The material investigated was AISI 316L (X2CrNiMol7-12-2) austenitic stainless steel. A commercial plasma-nitriding unit (pulsed dc) was used for the nitriding and carburising process. Additional samples were treated by the gasoxinitriding process for a comparison between plasma- and gasoxinitriding. The nitrided and carburised layer of austenitic stainless steel consists of the nitrogen or carbon S-phase (expanded austenite), respectively. X-ray diffraction investigations show the typical shift of the peaks to lower angles, indicating expansion of the fee lattice. Also the X-ray diffraction technique was employed to study the residual stresses in the nitrogen and carbon S-phase. The corrosion behaviour of surface engineered samples was investigated with electrochemical methods. Anodic potentiodynamic polarisation curves were recorded for testing the resistance against general corrosion (in H2SO4) and pitting corrosion (in NaCl).
文摘低温等离子灭菌是医院常用的一种医疗器械灭菌技术,尤其适用于一些热敏材料医疗器械的处理,可解决其灭菌、消毒方面困难的问题,可为临床医疗器械的正常应用提供有效支持。本研究主要介绍了舱门无法正常关闭、设备取消程序后不能正常开门的故障,通过逐步排查法层层分析最终确定故障点位于Pwa ss relay板和I/O数字电路板以及舱门传感器,最终通过更换元器件的方法排除了故障。本文通过对STERRAD 100S低温等离子灭菌器舱门相关的2例故障的排除方法进行分析,可为相关维修工程师提供一定的参考,具有借鉴意义。
基金Supported by programs of Research on the Technology and Equipment of Gaseous Pollutant Removal from the Emission of Household Garbage(15DZ12055904)Jointly Decomposition of Odorous Compounds by Dielectric Combined with Excimer Ultraviolet Emission(21577023)
文摘This study aimed to discuss the removal of hydrogen sulfide （H2S） with non-thermal plasma produced by a multilayer tubular dielectric barrier discharge reactor,which is useful in the field of plasma environmental applications.We explored the influence of various factors upon H2S removal efficiency （ηH2S） and energy yield （Ey）,such as specific energy density （SED）,initial concentration,gas flow velocity and the reactor configuration.The study showed that we can achieve ηH2S of 91% and the best Ey of 3100 mg kWh-1 when we set the SED,gas flow velocity,initial H2S concentration and layers of quartz tubes at 33.2 J 1-1,8.0 m s-1,30 mg m-3 and five layers,correspondingly.The average rate constant for the decomposition of hydrogen sulfide was 0.206 g m-3 s-1.In addition,we also presented the optimized working conditions,byproduct analysis and decomposition mechanism.
