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Hybrid electric discharge plasma technologies for water decontamination:a short review
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作者 商克峰 李杰 Rino MORENT 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第4期1-9,共9页
Electric discharge plasma(EDP)can efficiently degrade aqueous pollutants by its in situ gen erated strong oxidative species(OH,0,H2O2.O.etc)“nd other physiochemical effects(UV irradiation,shockwaves,local high temper... Electric discharge plasma(EDP)can efficiently degrade aqueous pollutants by its in situ gen erated strong oxidative species(OH,0,H2O2.O.etc)“nd other physiochemical effects(UV irradiation,shockwaves,local high temperature,etc),but a high energy consumptions limit the application of EDP in water treatment.Some adsorbents,catalysts,and oxida nts have been employed for en hanci ng the degradation of pollutants by discharge plasma.These hybrid plasma technologies offer improved water treatment performance compared to dischai'ge plasma alone.This paper reviews the water decontamination performance and mechanisms of these hybrid plasma technologies,and some suggestions on future water treatment technologies based on discharge plasma are also proposed. 展开更多
关键词 DISCHARGE PLASMA plasma/adsorbent plasma/catalyst plasma/oxidant WASTEWATER DECONTAMINATION
Plasma-catalysis: Is it just a question of scale?
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作者 J.Christopher Whitehead 《化学科学与工程前沿:英文版》 EI CAS CSCD 2019年第2期264-273,共10页
The issues of describing and understanding the changes in performance that result when a catalyst is placed into plasma are discussed. The different chemical and physical interactions that result and how their combina... The issues of describing and understanding the changes in performance that result when a catalyst is placed into plasma are discussed. The different chemical and physical interactions that result and how their combination might produce beneficial results for the plasma-catalytic processing of different gas streams are outlined with particular emphasis being placed on the different range of spatial and temporal scales that must be considered both in experiment and modelling. The focus is on non-thermal plasma where the lack of thermal equilibrium creates a range of temperature scales that must be considered. This contributes in part to a wide range of inhomogeneity in different properties such as species concentrations and electric fields that must be determined experimentally by in situ methods and be incorporated into modelling. It is concluded that plasmacatalysis is best regarded as conventional catalysis perturbed by the presence of a discharge, which modifies its operating conditions, properties and outcomes often in a very localised way. The sometimes used description "plasma-activated catalysis" is an apt one. 展开更多
关键词 PLASMA CATALYSIS plasma-activated CATALYSIS NON-THERMAL PLASMA CO2 conversion
Design and characteristics investigation of a miniature low-temperature plasma spark discharge device
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作者 李雪 周仁武 +3 位作者 张波 周儒森 Ken OSTRIKOV 方志 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第5期43-50,共8页
Atmospheric pressure low-temperature plasma is a promising tool in biomedicine applications including blood coagulation,bacterial inactivation,sterilization,and cancer treatment,due to its high chemical activity and l... Atmospheric pressure low-temperature plasma is a promising tool in biomedicine applications including blood coagulation,bacterial inactivation,sterilization,and cancer treatment,due to its high chemical activity and limited thermal damage.It is of great importance to develop portable plasma sources that are safe to human touch and suitable for outdoor and household operation.In this work,a portable and rechargeable low-temperature plasma spark discharge device(130 mm×80 mm×35 mm,300 g)was designed.The discharge frequency and plume length were optimized by the selection of resistance,capacitance,electrode gap,and ground electrode aperture.Results show that the spark plasma plume is generated with a length of 12 mm and a frequency of 10 Hz at a capacitance of 0.33μF.resistance of 1 MΩ,electrode gap of 2 mm,and ground electrode aperture of 1.5 mm.Biological tests indicate that the plasma produced by this device contains abundant reactive species,which can be applied in plasma biomedicine,including daily sterilization and wound healing. 展开更多
关键词 LOW-TEMPERATURE PLASMA SPARK DISCHARGE portable PLASMA source PLASMA MEDICINE
Silicone-coated polyimide films deposited by surface dielectric barrier discharges
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作者 Junggil KIM Yunjung KIM +1 位作者 Sangjin KIM Guangsup CHO 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第1期93-99,共7页
Hybrid dielectric barrier discharges are investigated for plasma generated on the surface of a dielectric layer, where two conducting electrodes of high voltage and ground are formulated on the upper and bottom surfac... Hybrid dielectric barrier discharges are investigated for plasma generated on the surface of a dielectric layer, where two conducting electrodes of high voltage and ground are formulated on the upper and bottom surfaces. Using a flexible thin polyimide-film of a thickness ranging from 25 to 125 μm, a plasma is generated with a voltage of about 1 kV and a frequency of 40 kHz.However, the surface of the dielectric layer was etched through a chemical reaction involving plasma oxygen radical species, and thus the polyimide films failed readily, resulting in dielectric breakdown within short operating time ranging from a few minutes to several tens of minutes,based on the film thicknesses of 25 μm and 125 μm, respectively. These plasma erosions were prevented by coating the polyimide surface with a 25 μm thick silicone paste. The siliconecoated film surface was then reinforced remarkably against plasma erosion as the organic polymer was vulnerable to chemical reaction of the plasma species, while the inorganic silicone exhibited a high chemical resistance against plasma erosion. 展开更多
关键词 PLASMA DISCHARGE atmospheric pressure nonthermal PLASMA POLYIMIDE film PLASMA EROSION
3DPMD-Arc-based additive manufacturing with titanium powder as raw material 预览
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作者 Hoefer Kevin Mayr Peter 《中国焊接:英文版》 EI CAS 2019年第1期11-15,共5页
The study aims to demonstrate the suitability of the 3DPMD for the production of titanium components with and without reinforcing particles in layer-by-layer design. Various demonstrators are prepared and analyzed. Th... The study aims to demonstrate the suitability of the 3DPMD for the production of titanium components with and without reinforcing particles in layer-by-layer design. Various demonstrators are prepared and analyzed. The microstructure, the porosity and the hardness values of the different structures are compared with each other through metallographic cross-sections. The uniform distribution of the carbides and the interaction with the matrix was analyzed by SEM and EDX.The miller-test method (ASTM G75-07) was used to determine data for the relative abrasivity of the structures. In summary, 3DPMD offers the possibility to produce titanium structures with and without reinforced particles. Using automated routines, it is possible to generate metal structures using welding robots directly from the CAD drawings. Microstructures and properties are directly related to the process and therefore material-process-property relationships are discussed within this work. 展开更多
关键词 ADDITIVE MANUFACTURING PLASMA TITANIUM 3D PLASMA metal DEPOSITION reinforced PARTICLES
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Applications of two electric arc plasma torches for the beneficiation of natural quartz 预览
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作者 Yuri-Mikhailovich Grishin Long Miao +2 位作者 Lev-Alekseevich Borisov Nikolay-Mikhailovich Serykh Alexey-Yurievich Kulagin 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期267-273,共7页
Experimental beneficiation processes of quartz concentrate in arc plasma torches of two different types and electric powers were studied. An emission scanning electron microscope and a universal laser analyzer were us... Experimental beneficiation processes of quartz concentrate in arc plasma torches of two different types and electric powers were studied. An emission scanning electron microscope and a universal laser analyzer were used to investigate the structures as well as the size distributions of grains and microparticles. Inductively coupled plasma–mass spectrometry was used to determine the chemical compositions of nonstructural solid-phase mineral impurities in quartz concentrate. Results related to the modified grains’ structure and size distribution, the compositions of impurities, and the gas–liquid inclusions in the quartz concentrate were investigated. The total impurities concentrations in the processed grains were found to satisfy the IOTA-STD standard (industry standard for grading high quality fused quartz products). The optimal condition (i.e., the optimal specific plasma enthalpy) for the production of high-purity quartz in arc plasma torches was found to depend on the geological-genetic type and the structural and textural features (i.e., chemical composition and gas–liquid inclusions) of the quartz concentrate. 展开更多
关键词 LOW-TEMPERATURE PLASMA BENEFICIATION high PURITY QUARTZ arc PLASMA TORCH IOTA-STD standard
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Important parameters in plasma jets for the production of RONS in liquids for plasma medicine: A brief review
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作者 Anna Khlyustova Cédric Labay +2 位作者 Zdenko Machala Maria-Pau Ginebra Cristina Canal 《化学科学与工程前沿:英文版》 EI CAS CSCD 2019年第2期238-252,共15页
Reactive oxygen and nitrogen species (RONS) are among the key factors in plasma medicine. They are generated by atmospheric plasmas in biological fluids, living tissues and in a variety of liquids. This ability of pla... Reactive oxygen and nitrogen species (RONS) are among the key factors in plasma medicine. They are generated by atmospheric plasmas in biological fluids, living tissues and in a variety of liquids. This ability of plasmas to create a delicate mix of RONS in liquids has been used to design remote or indirect treatments for oncological therapy by treating biological fluids by plasmas and putting them in contact with the tumour;Documented effects include selective cancer cell toxicity, even though the exact mechanisms involved are still under investigation. However, the "right" dose for suitable therapeutical activity is crucial and still under debate. The wide variety of plasma sources hampers comparisons. This review focuses on atmospheric pressure plasma jets as the most studied plasma devices in plasma medicine and compiles the conditions employed to generate RONS in relevant liquids and the concentration ranges obtained. The concentrations of H2O2, NO2^-, NO3^- and short-lived oxygen species are compared critically to provide a useful overview for the reader. 展开更多
关键词 ATMOSPHERIC plasma jets liquids ROS RNS plasma-dose
Multifunctional antimicrobial chlorhexidine polymers by remote plasma assisted vacuum deposition
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作者 Ana Mora-Boza Francisco J.Aparicio +5 位作者 Maria Alcaire Carmen López-Santos Juan P.Espinós Daniel Torres-Lagares Ana Borrás Angel Barranco 《化学科学与工程前沿:英文版》 EI CAS CSCD 2019年第2期330-339,共10页
Novel antibacterial materials for implants and medical instruments are essential to develop practical strategies to stop the spread of healthcare associated infections. This study presents the synthesis of multifuncti... Novel antibacterial materials for implants and medical instruments are essential to develop practical strategies to stop the spread of healthcare associated infections. This study presents the synthesis of multifunctional antibacterial nanocoatings on polydimethylsiloxane (PDMS) by remote plasma assisted deposition of sublimated chlorhexidine powders at low pressure and room temperature. The obtained materials present effective antibacterial activity against Escherichia coli K12, either by contact killing and antibacterial adhesion or by biocide agents release depending on the synthetic parameters. In addition, these multifunctional coatings allow the endure hydrophilization of the hydrophobic PDMS surface, thereby improving their biocompatibility. Importantly, cell-viability tests conducted on these materials also prove their non-cytotoxicity, opening a way for the integration of this type of functional plasma films in biomedical devices. 展开更多
关键词 PLASMA POLYMERS CONFORMAL PLASMA deposition CHLORHEXIDINE BACTERICIDE PDMS biocompatibility
Plasma shape optimization for EAST tokamak using orthogonal method
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作者 陈远洋 鲍晓华 +1 位作者 傅鹏 高格 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第1期453-459,共7页
It is necessary to reduce the currents of poloidal field(PF) coils as small as possible, during the static equilibrium design procedure of Experimental Advanced Superconductive Tokamak(EAST). The quasi-snowflake(QSF) ... It is necessary to reduce the currents of poloidal field(PF) coils as small as possible, during the static equilibrium design procedure of Experimental Advanced Superconductive Tokamak(EAST). The quasi-snowflake(QSF) divertor configuration is studied in this paper. Starting from a standard QSF plasma equilibrium, a new QSF equilibrium with 300 kA total plasma current is designed. In order to reduce the currents of PF6 and PF14, the influence of plasma shape on PF coil current distribution is analyzed. A fixed boundary equilibrium solver based on a non-rigid plasma model is used to calculate the flux distribution and PF coil current distribution. Then the plasma shape parameters are studied by the orthogonal method. According to the result, the plasma shape is redefined, and the calculated equilibrium shows that the currents of PF6 and PF14 are reduced by 3.592 kA and 2.773 kA, respectively. 展开更多
关键词 EAST PLASMA SHAPE ORTHOGONAL method PLASMA EQUILIBRIUM CALCULATION
介质阻挡低温等离子处理对花生蛋白持水性及溶解性的影响 预览
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作者 季慧 于娇娇 +3 位作者 张金 魏瑞 李书红 陈野 《农业工程学报》 EI CAS CSCD 北大核心 2019年第4期299-304,共6页
花生蛋白营养丰富,但因功能性质差,导致其在食品工业应用受限。低温等离子技术作为一种新兴的、非热、无危害技术,越来越受人关注,介质阻挡放电(dielectric barrier discharge,DBD)等离子体技术由于具有适应频率宽,可在较大空间内获得... 花生蛋白营养丰富,但因功能性质差,导致其在食品工业应用受限。低温等离子技术作为一种新兴的、非热、无危害技术,越来越受人关注,介质阻挡放电(dielectric barrier discharge,DBD)等离子体技术由于具有适应频率宽,可在较大空间内获得高密度非平衡等离子体,并且工艺简单、快速高效、节能环保,是近年来蛋白质改性研究的热点之一。采用介质阻挡低温等离子体对花生蛋白溶液进行改性处理,研究等离子体处理时间对花生蛋白结构及功能特性影响。试验结果表明:低温等离子处理能显著提高花生蛋白的溶解性、持水性,低温等离子处理时间为2min 时,花生蛋白溶解性和持水性达最大,与未处理样品相比分别提高了24.8%和79.6%;同时,花生蛋白乳化性、乳化稳定性、起泡性、起泡稳定性和持油性也有不同程度的提高。借助十二烷基硫酸钠-聚丙烯酰胺电泳(sodium dodecyl sulfate polyacrylamide gelelectrophoresis,SDS-PAGE)、傅里叶红外光谱(Fourier transform infrared,FTIR)、表面疏水性分析低温等离子对花生蛋白结构影响。分析结果表明,低温等离子处理并未改变花生蛋白的分子量分布;低温等离子处理后,β-折叠和无规则卷曲的含量增加,α-螺旋和β-转角的含量降低,蛋白的有序结构被破坏,结构由紧密变松散;花生蛋白表面疏水性显著提高。低温等离子处理是一种改善蛋白功能性质的有效方法。 展开更多
关键词 蛋白 等离子 结构 低温等离子 花生蛋白 功能性质
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Plasma cell leukemia-one in a million: A case report 预览
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作者 Akriti Gupta Jain Mohammed Faisal-Uddin +3 位作者 Abdul K Khan Mohammed Wazir Qi Shen Manoucher Manoucheri 《世界临床肿瘤学杂志(英文版)》 2019年第3期161-165,共5页
BACKGROUND Plasma cell leukemia(PCL) is diagnosed by the presence of an absolute plasma cell count of > 2 × 109/L or 20% plasma cells in the peripheral blood. Because the incidence of PCL is relatively low, ou... BACKGROUND Plasma cell leukemia(PCL) is diagnosed by the presence of an absolute plasma cell count of > 2 × 109/L or 20% plasma cells in the peripheral blood. Because the incidence of PCL is relatively low, our case report study presents a rare opportunity to describe the clinical and pathological characteristics of this leukemia, as well as different modalities of treatment and outcomes of primary PCL(pPCL).CASE SUMMARY A 56-year-old male with a history of hypertension complained of pain in the left flank area which started four months prior to admission. On admission, his vital signs were stable, and physical examination was completely benign. Laboratory evaluation showed hemoglobin of 5.1 g/dL, white blood cell count of 6.6 cells per cubic millimeter with 16% atypical lymphocytes, and platelet count of 51000 per microliter. Peripheral smear showed more than 10%-15% of plasma cells(Figure1), and flow cytometry of peripheral blood confirmed PCL with 24% plasma cells CD138+. Bone marrow biopsy demonstrated 80% plasma cells(38+, 138+, 117+,10-, 19-, 20-, 56-) with 90% cellularity. The Oncology team was consulted, and VCD therapy was started. After completing therapy at 1, 4, 8, and 11 d, the patient was discharged home. The patient was being considered for a bone marrow transplant evaluation within two months of discharge.CONCLUSION PCL is a rare and aggressive form of leukemia with a poor prognosis. Multicenter studies and clinical trials should be conducted to develop accurate criteria for the initial diagnosis and prompt treatment of this disease. 展开更多
关键词 Primary PLASMA CELL LEUKEMIA Case report Rare LEUKEMIA Secondary PLASMA CELL LEUKEMIA ALLOGENIC transplantation CHEMOTHERAPY
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Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates
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作者 陈坚 付天佐 +3 位作者 郭恒 李和平 姜东君 周明胜 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第4期99-106,共8页
In this paper,a one-dimension particle-in-cell(PIC)code(EDIPIC)is employed to simulate the parallel-plate ion extraction process under an externally applied electrostatic field,focusing on the analysis of the influe n... In this paper,a one-dimension particle-in-cell(PIC)code(EDIPIC)is employed to simulate the parallel-plate ion extraction process under an externally applied electrostatic field,focusing on the analysis of the influe nee of the initial electron temperature on the extracted ion fluxes to the metal plates during the ion extraction process.Compared with previously published results,the plasma oscillations on a timescale of the electron plasma period,and the excitation of the ion acoustic rarefaction waves resulting from the plasma oscillations originating from both the negative and positive electrodes,are studied for the first time.The modeling results show that both the negative and positive extractors can collect ions due to the plasma oscillations and the propagation of the ion acoustic rarefaction waves.With the in crease of the initial electron temperature achieved by keeping other parameters unchanged,on the one hand,both the ion speed and flux to the negative and positive plates increase,which leads to a significant decrease of the ion extraction time,while on the other hand,the ion flux to the positive plate after the formation of a Child-Langmuir sheath is much more sensitive to an increase of the initial electron temperature than that to the negative plate.The PIC simulation results provide a deeper physical understanding of the influence of the initial electron temperature on the characteristics of the entire ion extraction process in a decaying plasma. 展开更多
关键词 LOW-PRESSURE PLASMA decaying PLASMA SHEATH DYNAMICS
Plume diagnostics of BUSTLab microwave electrothermal thruster using Langmuir and Faraday probes
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作者 M Serhan YILDIZ Murat CELIK 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第4期145-154,共10页
This study presents the Langmuir and Faraday probe measurements conducted to determine the plume characteristics of the BUSTLab microwave electrothermal thruster(MET).The thruster,designed to operate at 2.45 GHz frequ... This study presents the Langmuir and Faraday probe measurements conducted to determine the plume characteristics of the BUSTLab microwave electrothermal thruster(MET).The thruster,designed to operate at 2.45 GHz frequency,is run with helium,argon and nitrogen gases as the propellant.For the measurements,the propellant volume flow rate and the delivered microwave power levels are varied.Experiments with nitrogen gas revealed certain operation regimes where a very luminous plume is observed.With the use of in-house-built Langmuir probes and a Faraday probe with guard ring,thruster plume electron temperature,plasma density and ion current density values are measured,and the results are presented.The measurements show that MET thruster plume effects on spacecraft will likely be similar to those of the arcjet plume.It is observed that the measured plume ion flux levels are very low for the high volume flow rates used for the operation of this thruster. 展开更多
关键词 MICROWAVE ELECTROTHERMAL THRUSTER plasma DIAGNOSTICS PLUME plasma FARADAY probe
Maser radiation from collisionless shocks:application to astrophysical jets
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作者 D.C.Speirs K.Ronald +27 位作者 A.D.R.Phelps M.E.Koepke R.A.Cairns A.Rigby F.Cruz R.M.G.M.Trines R.Bamford B.J.Kellett B.Albertazzi J.E.Cross F.Fraschetti P.Graham P.M.Kozlowski Y.Kuramitsu F.Miniati T.Morita M.Oliver B.Reville Y.Sakawa S.Sarkar C.Spindloe M.Koenig L.O.Silva D.Q.Lamb P.Tzeferacos S.Lebedev G.Gregori R.Bingham 《高功率激光科学与工程:英文版》 CAS CSCD 2019年第1期120-127,共8页
This paper describes a model of electron energization and cyclotron-maser emission applicable to astrophysical magnetized collisionless shocks. It is motivated by the work of Begelman, Ergun and Rees [Astrophys. J. 62... This paper describes a model of electron energization and cyclotron-maser emission applicable to astrophysical magnetized collisionless shocks. It is motivated by the work of Begelman, Ergun and Rees [Astrophys. J. 625, 51(2005)] who argued that the cyclotron-maser instability occurs in localized magnetized collisionless shocks such as those expected in blazar jets. We report on recent research carried out to investigate electron acceleration at collisionless shocks and maser radiation associated with the accelerated electrons. We describe how electrons accelerated by lower-hybrid waves at collisionless shocks generate cyclotron-maser radiation when the accelerated electrons move into regions of stronger magnetic fields. The electrons are accelerated along the magnetic field and magnetically compressed leading to the formation of an electron velocity distribution having a horseshoe shape due to conservation of the electron magnetic moment. Under certain conditions the horseshoe electron velocity distribution function is unstable to the cyclotron-maser instability [Bingham and Cairns, Phys. Plasmas 7, 3089(2000);Melrose, Rev. Mod. Plasma Phys. 1, 5(2017)]. 展开更多
关键词 laboratory ASTROPHYSICS plasma PHYSICS particle ACCELERATION plasma-wave INSTABILITIES
Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration
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作者 Muhammad Ajmal KHAN 李静 +1 位作者 李和平 Hafiz Imran Ahmad QAZI 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第5期102-112,共11页
Cold atmospheric plasma(CAP)jet has wide applications in various fields including advanced materials synthesis and modifications,biomedicine,environmental protection and energy saving,etc.Appropriate control on the vo... Cold atmospheric plasma(CAP)jet has wide applications in various fields including advanced materials synthesis and modifications,biomedicine,environmental protection and energy saving,etc.Appropriate control on the volume,temperature and chemically reactive species concentratio ns of the CAP jet is of great importance in actual applications.In this paper,an radio-frequency atmospheric-pressure glow discharge(RF-APGD)plasma generator with a hybrid cross-linear-field electrode configuration is proposed.The experimental results show that,with the aid of the copper mesh located at the downstream of the traditional co-axial-type plasma generator with a cross-field electrode configuration,a linear field between the inner powered electrode of the traditional plasma generator and the copper mesh can be established.This linerfield can,to some extent,enhance the discharges at the upstream of the copper mesh,resulting in small increments(all less than 12.5%)of the species emission intensities,electron excitation temperatures and gas temperatures by keeping other parameters being unchanged.And due to the intrinsic transparent and conducting features of the grounded copper mesh to the gas flowing,electric current and heat flux of the plasma plumes,a plasma region with higher concentrations of chemically reactive species and larger plasma plume diameters is obtained at the downstream of the grounded copper mesh on the same level of the gas temperature and electron excitation temperature compared to those of the plasma free jet.In addition,the charged particle number densities at the same downstream axial location of the grounded copper mesh decrease significantly compared to those of the plasma free jet.This means that the copper mesh is also,to some extent,helpful for separating the chemically reactive neutral species from the charged particles in side a plasma environment.The preceding results indicate that the cross-linear-field electrode configuration of the plasma generator is an effective approach for tuning the characte 展开更多
关键词 COLD ATMOSPHERIC PLASMA hybrid-cross-linear-field electrode configuration grounded copper mesh PLASMA jet CHARACTERISTICS modulation
The technology of space plasma in-situ measurement on the China Seismo-Electromagnetic Satellite
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作者 LIU Chao GUAN YiBing +3 位作者 ZHENG XiangZhi ZHANG AiBing PIERO Diego SUN YueQiang 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第5期829-838,共10页
The China Seismo-Electromagnetic satellite(CSES) was designed to study the ionospheric disturbances associated with earthquakes. Satellite payload includes nine instruments. Among them, we recall instruments for plasm... The China Seismo-Electromagnetic satellite(CSES) was designed to study the ionospheric disturbances associated with earthquakes. Satellite payload includes nine instruments. Among them, we recall instruments for plasma analysis, electric,magnetic fields and high energy particle detectors. Langmuir probe(LP) and plasma analyzer package(PAP) are the in-situ payloads to measure space plasma. Its scientific objective is to research space plasma physics phenomena and the ionosphere changes caused by seismic. It is the first application of in-situ measurement technology in the field of space exploration in China.The Langmuir probe and Plasma Analyzer Package have been tested and calibrated to verify the performance in INAF-IAPS.Currently, on-orbit testing is being performed with satellites. 展开更多
关键词 CSES LANGMUIR PROBE PLASMA ANALYZER PACKAGE SPACE PLASMA
Solitary kinetic Alfven waves in dense plasmas with relativistic degenerate electrons and positrons
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作者 Monzurul K AHMED Om P SAH 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第4期85-93,共9页
Propagation of solitary kinetic Alfven waves(KAWs)is investigated in small but finite/3(particle-to-magnetic pressure ratio)collisionless dense plasma whose constituents are non degenerate wann ions,and relativistic d... Propagation of solitary kinetic Alfven waves(KAWs)is investigated in small but finite/3(particle-to-magnetic pressure ratio)collisionless dense plasma whose constituents are non degenerate wann ions,and relativistic degenerate electrons and positrons.Through the use of reductive perturbation technique,Kortweg-de Vries equation is derived to obtain small amplitude localized wave solution of KAWs.The effects of plasma 0,positron concentration,electron relativistic degeneracy parameter,ion thermal temperature and obliqueness parameter on solitary KAWs are studied.The results of this theoretical investigation are aimed at elucidating characteristics of kinetic Alfven solitary waves in relativistic degenerate e-p-i plasmas found in dense astrophysical objects specifically neutron stars and white dwarfs. 展开更多
关键词 SOLITARY KINETIC Alfven waves dense plasmas electron-positron-ion plasma relativistic DEGENERATE PLASMA REDUCTIVE perturbation technique
Investigation of the performance of a pilot-scale barrel atmospheric plasma system for plasma activation of polymer particles 预览
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作者 Hisham M.Abourayana Peter J.Dobbyn +1 位作者 Pat Whyte Denis P.Dowling 《纳米技术与精密工程(英文)》 CAS CSCD 2019年第1期1-7,共7页
This study reports the development and performance of a pilot-scale barrel atmospheric plasma reactor for the atmospheric plasma activation treatment of polymer particles.The polymer particles treated included acrylon... This study reports the development and performance of a pilot-scale barrel atmospheric plasma reactor for the atmospheric plasma activation treatment of polymer particles.The polymer particles treated included acrylonitrile butadiene styrene(ABS)and polypropylene(PP).These particles had diameters in the range of 3–5mm.The initial studies were carried out using a laboratory-scale barrel reactor designed to treat polymer particle batch sizes of 20 g.A pilot-scale reactor that could treat 500 g particle batch sizes was then developed to facilitate pre-industrial-scale treatments.The effect of operating pulse density modulation(PDM)in the range 10%– 100%and plasma treatment time on the level of activation of the treated polymers were then investigated.ABS revealed a larger decrease inwater contact angle compared with PP after plasma treatment under the same conditions.The optimal treatment time of ABS(400 g of polymer particles)in the pilot-scale reactorwas 15 min.The plasma-activated polymer particles were used to fabricate dog-bone polymer parts through injection molding.Mechanical testing of the resulting dog-bone polymer parts revealed a 10.5%increase in tensile strength compared with those fabricated using non-activated polymer particles. 展开更多
关键词 Atmospheric pressure PLASMA BARREL PLASMA REACTOR Polymer particles Water contact angle X-ray PHOTOELECTRON spectroscopy Injection MOULDING
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血浆及外周血单个核细胞微小RNA在精神分裂症诊断中的研究 预览
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作者 王雨涵 王洁 +5 位作者 周炜鑫 郭天虹 罗彬瑞 程福 杨冬梅 黄远帅 《临床精神医学杂志》 2019年第3期175-179,共5页
目的:探索血浆及外周血单个核细胞(PBMC)中微小RNA(miRNA)在精神分裂症(SZ)诊断中的价值。方法:根据文献报道筛选出与SZ相关的7种miRNA(has-miR-449a,has-miR-34a-5p,has-miR-652-3p,has-miR-564,has-miR-432-5p,has-miR-548d-5p和has-m... 目的:探索血浆及外周血单个核细胞(PBMC)中微小RNA(miRNA)在精神分裂症(SZ)诊断中的价值。方法:根据文献报道筛选出与SZ相关的7种miRNA(has-miR-449a,has-miR-34a-5p,has-miR-652-3p,has-miR-564,has-miR-432-5p,has-miR-548d-5p和has-miR-572);提取35例初诊的SZ患者(患者组)及15名健康体检者(对照组)的抗凝全血的血浆及PBMC中的RNA,采用实时逆转录聚合酶链式扩增反应技术测定血浆及PBMC中这7种miRNA水平,计算其相对表达量。结果:患者组血浆及PBMC中4种miRNA(miR-652-3p,miR-564,miR-432-5p和miR-548d-5p)相对表达量较对照组明显增加(P均<0.05);患者组7种miRNA的相对表达量血浆明显高于PBMC(P均<0.05);多变量ROC曲线显示,患者组血浆miRNA(has-miR-652-3p,has-miR-564,has-miR-548d-5p)ROC曲线下面积为98%,灵敏度为90.9%,特异度为95.4%;PBMCmiRNA(has-miR-652-3p,has-miR-564,has-miR-432-5p以及has-miR-548d-5p)ROC曲线下面积为86%;灵敏度为88.2%,特异度为78.3%。结论:SZ患者血浆及PBMC中的miRNA(miR-652-3p,miR-564,miR-432-5p和miR-548d-5p)相对表达量明显增高;血浆miRNA更有潜力成为SZ的分子诊断标志物。 展开更多
关键词 精神分裂症 微小RNA 血浆 外周血单个核细胞
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miRNA-223和miRNA-155在非小细胞肺癌患者血浆中的表达研究
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作者 叶丽君 喻长法 +3 位作者 赵肖丽 蔡莎莎 杨泽山 阮荣华 《中国预防医学杂志》 CAS CSCD 2019年第1期63-67,共5页
目的探讨miRNA-223 (miR-223)、miRNA-155 (miR-155)在非小细胞肺癌(non-small cell lung cancer,NSCLC)患者外周血浆中的表达。方法收集2014年1月至2016年6月在台州市第一人民医院住院的NSCLC患者87例(NSCLC组)及同期进行健康体检的30... 目的探讨miRNA-223 (miR-223)、miRNA-155 (miR-155)在非小细胞肺癌(non-small cell lung cancer,NSCLC)患者外周血浆中的表达。方法收集2014年1月至2016年6月在台州市第一人民医院住院的NSCLC患者87例(NSCLC组)及同期进行健康体检的30例(对照组)为研究对象,采用实时荧光定量RT-PCR (qRT-PCR)方法检测外周血浆中miR-223和miR-155水平,分析血浆中miR-223和miR-155表达量与各病理特征关系。结果血浆中miR-223和miR-155在NSCLC组表达水平高于对照组(t=5.083、7.496,P<0.05);miR-223和miR-155在NSCLC患者血浆中的表达水平与TNM分期有关(t=-4.682、-9.536,P<0.05),与性别、年龄、组织学类型、分化程度无关(P>0.05);miR-223诊断NSCLC的AUC为0.817,界值、敏感度、特异度、准确度、约登指数分别为0.305、70.11%、83.33%、73.50%和0.534;miR-155诊断NSCLC的AUC为0.901,界值、敏感度、特异度、准确度、约登指数分别为2.005、80.46%、90.00%、82.91%和0.705;miR-223和miR-155两者联合检测的敏感度、特异度和准确度为85.06%、83.33%和84.62%。miR-223和miR-155低表达组比高表达有更好的累积生存率(P<0.05)。结论 miR-223和miR-155在NSCLC患者血浆中的高表达提示其可作为NSCLC早期诊断的标志物,两者联合检测能提高诊断效能。 展开更多
关键词 miRNA-223 miRNA-155 非小细胞肺癌 血浆 联合检测
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