The surface carbonitriding of cast iron is investigated in an aqueous solution of acetamide and glycerin. Microstructure, chemical and phase composition and corrosion performance of the carbonitriding layers are inves...The surface carbonitriding of cast iron is investigated in an aqueous solution of acetamide and glycerin. Microstructure, chemical and phase composition and corrosion performance of the carbonitriding layers are investigated by scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction, as well as potentiodynamic polarization testing. X-ray diffraction results show that the carbonitriding coatings are composed of martensite, anstenite（γ-Fe）, Fe2C, Fe3C, Fe5 C2, FeN and ε-Fe2-3N. After the plasma electrolytic carbonitriding treatment the corrosion resistance of cast iron is clearly improved compared to the substrate, and the coatings produced at 350 V for 30s give the best corrosion resistance.展开更多
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 dielectric barrier discharge （DBD） system in atmospheric pressure utilized for the treatment of industrial landfill leachate is reported. The discharge parameters, such as the operating frequency, gas flow rate, ...An dielectric barrier discharge （DBD） system in atmospheric pressure utilized for the treatment of industrial landfill leachate is reported. The discharge parameters, such as the operating frequency, gas flow rate, and treating duration, were found to affect significantly the removal of ammonia nitrogen （AN） in industrial landfill leachate. An increase in treating duration leads to an obvious increase in the removal efficiency of AN （up to 83%） and the leachate color changed from deep grey-black to transparent. Thus the dielectric barrier discharges in atmospheric pressure could degrade the landfill leachate effectively. Typical waveforms of both applied voltage and discharge current were also presented for analyzing the discharge processes under different discharge parameters. Optical emission spectra measurements indicate that oxidation species generated in oxygen DBD plasma play a crucial role in removing AN, oxidizing organic and inorganic substances and decolorizing the landfill leachate.展开更多
OBJECTIVE:To evaluate the effects of moxibustion and acupuncture of Zusanli(ST 36)and Zhongwan(CV 12)acupoints on chronic atrophic gastritis(CAG)in rats,and to study the mechanisms behind their actions.METHODS:Forty-f...OBJECTIVE:To evaluate the effects of moxibustion and acupuncture of Zusanli(ST 36)and Zhongwan(CV 12)acupoints on chronic atrophic gastritis(CAG)in rats,and to study the mechanisms behind their actions.METHODS:Forty-four male Sprague-Dawley rats were induced with CAG by intragastric administration of 40%ethanol combined with free drinking of N-methyl-N′-nitro-N-nitrosoguanidine and irregular feeding for 12 weeks,followed by daily treatment with moxibustion or acupuncture for 2 weeks.Histopathologic examination,Western blotting of cytokines[epidermal growth factor(EGF),EGF receptor(EGFR),extracellular signal-regulated kinase(ERK),phosphorylated ERK(p-ERK)],and1 H NMR-based metabolic profiling of gastric tissues were used to measure changes related to CAG modeling and treatment.RESULTS:Moxibustion and acupuncture at Zusanli(ST 36)and Zhongwan(CV 12)each relieved CAG-induced abnormalities in histopathology and cytokine expression of ERK and p-ERK.Only moxibustion treatment regulated the expression of EGF and EGFR.Metabolites that were increased in gastric tissue by CAG induction(alanine,nicotinamide adenine dinucleotide phosphate,uracil DNA glycosylase,lactate,glycerol and adenosine)were restored to normal levels after moxibustion treatment;acupuncture treatment only normalized the levels of adenosine monophosphate and glycerol.CONCLUSION:Our findings suggest that moxibustion or acupuncture at Zusanli(ST 36)and Zhongwan(CV 12)can significantly improve the condition of CAG in rats.These treatments exert their effects on CAG through different mechanisms.展开更多
Nano-Ag incorporated hydroxyapatite/titania （HA/TiO2） coatings were deposited on Ti6A14V substrates by the plasma electrolytic oxidation process. Compared with the substrate, the deposited coatings display attractiv...Nano-Ag incorporated hydroxyapatite/titania （HA/TiO2） coatings were deposited on Ti6A14V substrates by the plasma electrolytic oxidation process. Compared with the substrate, the deposited coatings display attractive mechani- cal and biomedical properties. First, the coatings have stronger wear resistance and corrosion resistance. Second, they show a strong antibacterial ability. The mean vitality of the P. gingivalis on the coating surfaces is reduced to about 21%. Third, the coatings have good biocompatibility. The mean viability of the fibroblast cells on the coating surface is increased to about 130%. With these attractive properties, Ag incorporated HA/TiO2 coatings may be useful in the biomedical field.展开更多
A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intens...A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intensified charge coupled device （ICCD） images show that the well-aligned air microplasma device is able to generate a large-area and homogeneous discharge at the applied voltages ranging from 12 kV to 14 kV, with a repetition frequency of 5 kHz, which is attributed to the diffusion effect of plasma on dielectric surface. Moreover, this well-aligned microplasma device may result in the uniform and large-area surface modification of heat-sensitive PET polymers without damage, such as optimization in hydrophobicity and biocompatibility. In the biomedical field, the utility of this well-aligned microplasma device is further testified. It proves to be very efficient for the large-area and uniform inactivation of E. coli cells with a density of 103/cm2 on LB agar plate culture medium, and inactivation efficiency can reach up to 99% for 2-min treatment.展开更多
Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10^（21）ions/m^2.s）He~＋at an irradi...Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10^（21）ions/m^2.s）He~＋at an irradiation temperature of 600℃and at a dose of1.0×10^（25）ions/m^2.This non-destructive conductive atomic force microscopy technique provides direct observation and comparison of surface swellings with growth of nanoscale defects in the irradiated materials.A coral-like surface structure and nanostructured defects were formed in W when irradiated at a He＋dose of 1.0×10^（25）ions/m^2.Increasing the annealing temperature resulted in an increase in the size of nanostructured defects and serious surface damage of W.Compared to W,Mo suffered much less surface damage after being irradiated at various He~＋doses.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
Recently, we found some errors in Fig. 3 of the article Chin. Phys. B 24 085201 (2015). Upon a thorough examination of the raw data materials, we confirm that the image error did not impact any of the findings and con...Recently, we found some errors in Fig. 3 of the article Chin. Phys. B 24 085201 (2015). Upon a thorough examination of the raw data materials, we confirm that the image error did not impact any of the findings and conclusions of the paper. Based on this, we have made corrections to the original article.展开更多
Polytetrafluoroethylene films are treated by room temperature helium atmospheric pressure plasma plumes, which are generated with a home-made single liquid electrode plasma device. After plasma treatment, the water co...Polytetrafluoroethylene films are treated by room temperature helium atmospheric pressure plasma plumes, which are generated with a home-made single liquid electrode plasma device. After plasma treatment, the water contact angle of polytetrafiuoroethylene fihn drops from 114° to 46° and the surface free energy increases from 22.0 mJ/m2 to 59.1 mJ/m2. The optical emission spectrum indicates that there are reactive species such as O2＋, O and He in the plasma plume. After plasma treatment, a highly crosslinking structure is formed on the fihn surface and the oxygen element is incorporated into the film surface in the forms of C O-C-, -C=O, and O C=O groups. Over a period of 10 days, the contact angle of the treated film is recovered by only about 10°, which indicates that the plasma surface modification is stable with time.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10675165, and the Project of International Cooperation and Exchanges NSFC-KOSEF （No 10811140326）.
文摘The surface carbonitriding of cast iron is investigated in an aqueous solution of acetamide and glycerin. Microstructure, chemical and phase composition and corrosion performance of the carbonitriding layers are investigated by scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction, as well as potentiodynamic polarization testing. X-ray diffraction results show that the carbonitriding coatings are composed of martensite, anstenite（γ-Fe）, Fe2C, Fe3C, Fe5 C2, FeN and ε-Fe2-3N. After the plasma electrolytic carbonitriding treatment the corrosion resistance of cast iron is clearly improved compared to the substrate, and the coatings produced at 350 V for 30s give the best corrosion resistance.
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.
文摘An dielectric barrier discharge （DBD） system in atmospheric pressure utilized for the treatment of industrial landfill leachate is reported. The discharge parameters, such as the operating frequency, gas flow rate, and treating duration, were found to affect significantly the removal of ammonia nitrogen （AN） in industrial landfill leachate. An increase in treating duration leads to an obvious increase in the removal efficiency of AN （up to 83%） and the leachate color changed from deep grey-black to transparent. Thus the dielectric barrier discharges in atmospheric pressure could degrade the landfill leachate effectively. Typical waveforms of both applied voltage and discharge current were also presented for analyzing the discharge processes under different discharge parameters. Optical emission spectra measurements indicate that oxidation species generated in oxygen DBD plasma play a crucial role in removing AN, oxidizing organic and inorganic substances and decolorizing the landfill leachate.
基金Supported by the National Key Basic Research Development Plan(973 Plan),China(2015CB554502)the National Natural Science Foundation of China,China(No.81574082)+1 种基金the Natural Science Foundation of Hunan Province of China,China(2018JJ2295)the Hunan Province University Innovation Platform Open Fund Project,China(No.18K066)
文摘OBJECTIVE:To evaluate the effects of moxibustion and acupuncture of Zusanli(ST 36)and Zhongwan(CV 12)acupoints on chronic atrophic gastritis(CAG)in rats,and to study the mechanisms behind their actions.METHODS:Forty-four male Sprague-Dawley rats were induced with CAG by intragastric administration of 40%ethanol combined with free drinking of N-methyl-N′-nitro-N-nitrosoguanidine and irregular feeding for 12 weeks,followed by daily treatment with moxibustion or acupuncture for 2 weeks.Histopathologic examination,Western blotting of cytokines[epidermal growth factor(EGF),EGF receptor(EGFR),extracellular signal-regulated kinase(ERK),phosphorylated ERK(p-ERK)],and1 H NMR-based metabolic profiling of gastric tissues were used to measure changes related to CAG modeling and treatment.RESULTS:Moxibustion and acupuncture at Zusanli(ST 36)and Zhongwan(CV 12)each relieved CAG-induced abnormalities in histopathology and cytokine expression of ERK and p-ERK.Only moxibustion treatment regulated the expression of EGF and EGFR.Metabolites that were increased in gastric tissue by CAG induction(alanine,nicotinamide adenine dinucleotide phosphate,uracil DNA glycosylase,lactate,glycerol and adenosine)were restored to normal levels after moxibustion treatment;acupuncture treatment only normalized the levels of adenosine monophosphate and glycerol.CONCLUSION:Our findings suggest that moxibustion or acupuncture at Zusanli(ST 36)and Zhongwan(CV 12)can significantly improve the condition of CAG in rats.These treatments exert their effects on CAG through different mechanisms.
基金Project supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.11005151)the National Natural Science Foundation of China(Grant No.11347110)+2 种基金the Open Research Fund of the Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education,Nanjing University of Posts and Telecommunications,China(Grant No.NYKL201303)the Scientific Research Foundation of Nanjing University of Posts and Telecommunications,China(Grant No.NY213054)the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘Nano-Ag incorporated hydroxyapatite/titania （HA/TiO2） coatings were deposited on Ti6A14V substrates by the plasma electrolytic oxidation process. Compared with the substrate, the deposited coatings display attractive mechani- cal and biomedical properties. First, the coatings have stronger wear resistance and corrosion resistance. Second, they show a strong antibacterial ability. The mean vitality of the P. gingivalis on the coating surfaces is reduced to about 21%. Third, the coatings have good biocompatibility. The mean viability of the fibroblast cells on the coating surface is increased to about 130%. With these attractive properties, Ag incorporated HA/TiO2 coatings may be useful in the biomedical field.
基金supported by the Natural Science Foundation of Fujian Province,China(Grant No.2014J01025)the National Natural Science Foundation of China(Grant No.11275261)+1 种基金the Natural Science Foundation of Guangdong Province,China(Grant No.2015A030313005)the Fund from the Fujian Provincia Key Laboratory for Plasma and Magnetic Resonance,China
文摘A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intensified charge coupled device （ICCD） images show that the well-aligned air microplasma device is able to generate a large-area and homogeneous discharge at the applied voltages ranging from 12 kV to 14 kV, with a repetition frequency of 5 kHz, which is attributed to the diffusion effect of plasma on dielectric surface. Moreover, this well-aligned microplasma device may result in the uniform and large-area surface modification of heat-sensitive PET polymers without damage, such as optimization in hydrophobicity and biocompatibility. In the biomedical field, the utility of this well-aligned microplasma device is further testified. It proves to be very efficient for the large-area and uniform inactivation of E. coli cells with a density of 103/cm2 on LB agar plate culture medium, and inactivation efficiency can reach up to 99% for 2-min treatment.
基金supported by the National Magnetic Confinement Fusion Program of China(No.2011GB108011)National Natural Science Foundation of China(No.11405023)+1 种基金the Scientific Research Fund of Liaoning Provincial Education Department(No.L2014539)the Fundamental Research Funds for the Central Universities of China(No.DC201502080410)
文摘Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10^（21）ions/m^2.s）He~＋at an irradiation temperature of 600℃and at a dose of1.0×10^（25）ions/m^2.This non-destructive conductive atomic force microscopy technique provides direct observation and comparison of surface swellings with growth of nanoscale defects in the irradiated materials.A coral-like surface structure and nanostructured defects were formed in W when irradiated at a He＋dose of 1.0×10^（25）ions/m^2.Increasing the annealing temperature resulted in an increase in the size of nanostructured defects and serious surface damage of W.Compared to W,Mo suffered much less surface damage after being irradiated at various He~＋doses.
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Recently, we found some errors in Fig. 3 of the article Chin. Phys. B 24 085201 (2015). Upon a thorough examination of the raw data materials, we confirm that the image error did not impact any of the findings and conclusions of the paper. Based on this, we have made corrections to the original article.
基金Project supported by the State Key Program of National Natural Science Foundation of China (Grant No. 10735090)the Young Scientist Fund of the National Natural Science Foundation of China (Grant No. 11005151)
文摘Polytetrafluoroethylene films are treated by room temperature helium atmospheric pressure plasma plumes, which are generated with a home-made single liquid electrode plasma device. After plasma treatment, the water contact angle of polytetrafiuoroethylene fihn drops from 114° to 46° and the surface free energy increases from 22.0 mJ/m2 to 59.1 mJ/m2. The optical emission spectrum indicates that there are reactive species such as O2＋, O and He in the plasma plume. After plasma treatment, a highly crosslinking structure is formed on the fihn surface and the oxygen element is incorporated into the film surface in the forms of C O-C-, -C=O, and O C=O groups. Over a period of 10 days, the contact angle of the treated film is recovered by only about 10°, which indicates that the plasma surface modification is stable with time.
