The plasma electrolytic carbonitriding(PEC/N)process is applied to cast iron using an aqueous solution of acetamide and glycerin as the electrolyte.Mechanical properties of the carbonitriding layers on cast iron are i...The plasma electrolytic carbonitriding(PEC/N)process is applied to cast iron using an aqueous solution of acetamide and glycerin as the electrolyte.Mechanical properties of the carbonitriding layers on cast iron are investigated.After the PEC/N treatment,the microhardness and wear resistance of cast iron are improved significantly compared to the untreated substrate.When the substrate is processed at 350V for 60 s,the coating presents the highest microhardness and it is about 554.14HK0.02,and the coating with the highest hardness has the best wear resistance.展开更多
An atmospheric cold plasma brush suitable for large area and low-temperature plasma-based sterilization is designed and used to treat enterococcus faecalis bacteria.The results show that the efficiency of the inactiva...An atmospheric cold plasma brush suitable for large area and low-temperature plasma-based sterilization is designed and used to treat enterococcus faecalis bacteria.The results show that the efficiency of the inactivation process by helium plasma is dependent on applied power and exposure time.After plasma treatments,the cell structure and morphology changes can be observed by scanning electron microscopy.Optical emission measurements indicate that reactive species such as O and OH play a significant role in the sterilization process.展开更多
为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状...为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状和棱柱状为主,淋溶层存在显著的石灰性沉积,pH显著高于其他土层;半干旱区无显著犁底层,土壤容重在1.40 g cm-3左右,土壤结构体以块状和团粒为主,没有显著的石灰性沉积;不同区域黄绵土土壤颗粒均以粉砂粒为主,黏粒含量低于10%,半干旱区黏粒含量低于半湿润区;除表层以外,其他各层<0.25 mm水稳性团聚体比例超过50%,不利于蓄积水分养分;有机质、氮及速效磷含量较低是土壤肥力的主要障碍因子。展开更多
基金by the National Natural Science Foundation of China under Grant Nos 10735090 and 11005151(Young Scientists Fund).
文摘The plasma electrolytic carbonitriding(PEC/N)process is applied to cast iron using an aqueous solution of acetamide and glycerin as the electrolyte.Mechanical properties of the carbonitriding layers on cast iron are investigated.After the PEC/N treatment,the microhardness and wear resistance of cast iron are improved significantly compared to the untreated substrate.When the substrate is processed at 350V for 60 s,the coating presents the highest microhardness and it is about 554.14HK0.02,and the coating with the highest hardness has the best wear resistance.
基金Supported by the Young Scientists Fund of the National Natural Science Foundation of China under Grant No 11005151.
文摘An atmospheric cold plasma brush suitable for large area and low-temperature plasma-based sterilization is designed and used to treat enterococcus faecalis bacteria.The results show that the efficiency of the inactivation process by helium plasma is dependent on applied power and exposure time.After plasma treatments,the cell structure and morphology changes can be observed by scanning electron microscopy.Optical emission measurements indicate that reactive species such as O and OH play a significant role in the sterilization process.
文摘为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状和棱柱状为主,淋溶层存在显著的石灰性沉积,pH显著高于其他土层;半干旱区无显著犁底层,土壤容重在1.40 g cm-3左右,土壤结构体以块状和团粒为主,没有显著的石灰性沉积;不同区域黄绵土土壤颗粒均以粉砂粒为主,黏粒含量低于10%,半干旱区黏粒含量低于半湿润区;除表层以外,其他各层<0.25 mm水稳性团聚体比例超过50%,不利于蓄积水分养分;有机质、氮及速效磷含量较低是土壤肥力的主要障碍因子。
