plasma

摘要： Recently,packed-bed discharge plasma technologies have been widely studied for treatment of volatile organic compounds(VOCs),due to the good performance in improving the degradation and mineralization of VOCs.In this paper,a coaxial cylindrical dielectric barrier discharge reactor packed with porous material of micron-sized pores was used for degradation of benzene,and the discharge characteristics and ozone generation characteristics were studied.When the discharge length was 12 cm and the filling length was 5 cm,the packed particles in the discharge area significantly increased the number of micro-discharges,and the current amplitude and density increased with the pore size of packed particles,but the discharge power and ozone concentration showed a trend of first increasing and then decreasing.The discharge power and ozone production reached the maximum when the size of pore former was 75μm,correspondingly,the degradation efficiency of benzene was the highest.

摘要： In this work,the theoretical analysis and experiment results investigating the influence of plasma-induced reflected wave variations on microwave transmission characterization are presented.Firstly,an analytical transmission line model for transmission characterization of plasma in shock tube is derived and validated against full-wave simulation.Then,the theoretical analysis of transmission characterization based on a time-dependent reconstruction algorithm that takes into account the variations of reflected wave is presented and the influence of reflection variations under various states of plasma is also investigated.The unusual increase in the amplitude of transmitted wave is theoretically predicted and experimentally demonstrated as well.Finally,the experiment results are also presented to illustrate the effects of reflected wave variations in practical microwave transmission characterization of supersonic plasma excited in shock tube.

摘要： In this study,uniform diamond films with a diameter of 100 mm were deposited in a 15 kW/2.45 GHz ellipsoidal microwave plasma chemical vapour deposition system.A phenomenological model previously developed by our group was used to simulate the distribution of the electric strength and electron density of plasma.Results indicate that the electric field in the cavity includes multiple modes,i.e.TM_(02) and TM_(03).When the gas pressure exceeds 10 kPa,the electron density of plasma increases and plasma volume decreases.A T-shaped substrate was developed to achieve uniform temperature,and the substrate was suspended in air fromΦ70 to 100 mm,thus eliminating vertical heat dissipation.An edge electric field was added to the system after the introduction of the T-shaped substrate.Moreover,the plasma volume in this case was greater than that in the central electric field but smaller than that in the periphery electric field of the TM_(02) mode.This indicates that the electric field above and below the edge benefits the plasma volume rather than the periphery electric field of the TM_(02) mode.The quality,uniformity and surface morphology of the deposited diamond films were primarily investigated to maintain substrate temperature uniformity.When employing the improved substrate,the thickness unevenness of theΦ100 mm diamond film decreased from 22%to 7%.

摘要： When the circuit breaker cuts the electric current, an electric arc is created between its electrodes. The success or failure of breaking the electric current by the circuit breaker depends strongly on the physico-chemical properties of the electric arc created, such as the composition of which depends on the material of the electrical contacts. In this work, we determine the equilibrium composition of the electric arc in the low voltage air circuit breaker with silver tin dioxide alloy contacts, in a temperature range from 500 K to 15,000 K and at atmospheric pressure. We use the Gibbs free energy minimization method and develop a computer code to determine the equilibrium composition of the created plasma. The analysis of the results obtained shows that O2 particles with a dissociation energy of 5.114 eV, NO with a dissociation energy of 6.503 eV, and N2 dissociation 9.756 eV dissociate around 3500 K, 5000 K, and 7500 K, respectively. We note that the electro-neutrality is established between the electrons and the cations: Ag+ and NO+, for temperatures lower than 6500 K. For temperatures higher than 6500 K, the electro-neutrality is established between the electrons and the cations: N+, O+, and Ag+. The numerical density of the electrons increases when the proportion of the vapor of the electrical contacts increases in the mixture, in particular for temperatures lower than 11,000 K.

摘要： BACKGROUND DNA methylation is a part of epigenetic modification,that is closely related to the growth and development of colorectal cancer(CRC).Specific methylated genes and methylated diagnostic models of tumors have become current research focuses.The methylation status of circulating DNA in plasma might serve as a potential biomarker for CRC.AIM To investigate genome-wide methylation pattern in early CRC using the Illumina Infinium Human Methylation 850K BeadChip.METHODS The 850K Methylation BeadChip was used to analyze the genome-wide methylation status of early CRC patients(n=5)and colorectal adenoma patients(n=5).Gene ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathways enrichment analyses were performed on the selected differentially methylated sites to further discover candidate methylation biomarkers in plasma.RESULTS A total of 1865 methylated CpG sites with significant differences were detected,including 676 hypermethylated sites and 1189 hypomethylated sites.The distribution of these sites covered from the 1^(st) to 22^(nd) chromosomes and are mainly distributed on the gene body and gene promoter region.GO and KEGG enrichment analysis showed that the functions of these genes were related to biological regulation,molecular binding,transcription factor activity and signal transduction pathway.CONCLUSION The study demonstrated that the Illumina Infinium Human Methylation 850K BeadChip can be used to investigate genome-wide methylation status of plasma DNA in early CRC and colorectal adenoma patients.

摘要： Background:Polyclonal convalescent plasma may be obtained from donors who have recovered from coronavirus disease 2019(Covid-19).The efficacy of this plasma in preventing serious complications in outpatients with recent-onset Covid-19 is uncertain.

摘要： In order to study the effect of shock wave formation on propellant ignition in capillary discharge,the shock wave formation process was analyzed using experimental and theoretical methods;the plasma jet temperature was measured,and closed bomb and 30 mm gun experiments were carried out.The results show that the first shock wave has a smaller value and larger range of influence,while the second shock wave has a larger value and smaller range of influence.A plasma jet can generate a shock wave at the nozzle according to the calculated plasma pressure and velocity,which is well confirmed by experiments and calculations.The plasma jet temperature is high during the formation of a shock wave and then decreases sharply.Plasma ignition can increase the burning rate of a propellant by about 30%by increasing the burning surface area of the propellant.Compared to conventional ignition,the average maximum chamber pressure and average muzzle velocity of plasma ignition are increased by 9.1 MPa and29.3 m·s^(-1)(~3%),respectively,in a 30 mm gun.Plasma ignition has strong ignition ability and short ignition delay time due to the generation of a shock wave.By increasing the burning rate of the propellant,the muzzle velocity can be greatly improved when the maximum chamber pressure increases a little.The characteristics of the shock wave can be applied in the application of the capillary discharge plasma.For example,it can be applied in fusion,launching and combustion.

摘要： Owing to the ongoing pandemic,the importance of and demand for antimicrobial textiles have reached new heights.In addition to being used for medical purposes,antimicrobial textiles could be a self-defense entity against microbes for the general population.Because textiles are widely used,they can effectively be used to prevent the spread of microbes worldwide.The conventional antibacterial finishing process of textiles is the wet treatment method using either the pad–dry–cure or exhaustion techniques.However,the textile wet treatment industries are major contributors to worldwide pollution,which is extremely concerning.Given the current and near-future high demand,it is imperative to include plasma in antimi-crobial finishing to achieve high efficiency in production,while retaining a safe environment.Hence,this paper reviews the rationale of plasma use in textile antimicrobial finishing through a critical analysis of recent studies and emphasizes the types and mechanisms of plasma techniques available for application.

摘要： The mutagenic effects of discharge plasma and plasma+PAW(plasma and its activated water combined) on Astragalus adsurgens Pall seeds were explored. Needle array-plate dielectric-barrier discharge plasma was used to treat A. adsurgens Pall seeds and PAW was prepared at the same time.The deionized water and the obtained PAW were used to cultivate plasma-treated seeds in groups and the survival rate of each group was counted. Results showed that the survival rate of the treated seeds of A. adsurgens Pall when cultured with deionized water was not significantly different from that of the control check(CK). The culture with PAW had an obvious lethal effect and each group reached the half-lethal dose. Reactive oxygen species(ROS) and RNA-Seq analysis of seedlings in the 3 h treatment group showed that the content of ROS in the 3 d post-treatment group was significantly higher than that of the CK. Because expression of the gene with the function of scavenging superoxide free radicals was upregulated, the ROS content of seedlings on the sixth day was significantly lower than that on the third day. Plasma and plasma+PAW treatments changed a large number of gene expressions;particularly, the plasma+PAW group caused plant-growth genes to be significantly upregulated. After treatment, the seedlings of A. adsurgens Pall may grow faster and have higher nutritional value. This research is of great significance to the wider application of isoelectronic bodies and their activated water physicochemical mutagens in biological effects and breeding research.

摘要： Building three-dimensional(3D) current collectors is a promising strategy to surmount the bottlenecks of lithium metal anodes(LMAs), but the regulation methodology of a 3D current collector has seldom been considered comprehensively concerning both skeleton architectures and surface coatings. Herein, a robust porous 3D nickel skeleton(NS) with lithiophilic NiN nanocoatings(NiN@NS) is synthesized via an integrative route of powder metallurgy/plasma-enhanced nitridation technics. The facile powder metallurgical method facilitates the adjustment of NS architectures toward sufficient electrolyte adsorption and even current density distribution, while the followed plasma-enhanced chemical vapor deposition(PECVD) method can induce compact NiN nanocoatings on NS, which reduces the Li nucleation overpotential, accelerates the Li-ion transfer, and facilitates a highly reversible oriented texture of Li deposition morphology owing to the dense and homogenous deposition of Li into the pores. The optimized NiN@NS current collector shows a high averaged Coulombic efficiency(CE) of 98.8% over 350cycles, a prolonged lifespan of 1000 h(at 2 mA cm^(-2)) in symmetrical cells, together with the significant performance in full cells. The ingenious methodology reported in this work can also be broadly applicable for the controllable production of other 3D skeletons with nitride nanocoatings for various applications.

摘要： 随着电子、通信产业的飞速发展,高频、RF设计越来越广泛,PCB上越来越多的运用到高频板材来满足信号传输的要求.但是由于高频板材价格较为昂贵,客户从节约成本的角度考虑,在PCB的结构设计上采用混压的方式,即除了必要的信号层采用HydroCarbon/Ceramic(或PTFE/Ceramic)结构的高频覆铜板材,以满足其信号传输速度、信号完整性以及阻抗匹配等要求,其他层采用常规FR-4覆铜板材.显然这样的设计对成本控制有很大的优势,但给PCB加工带来了一些其它问题.本文通过理论和实验对PTFE+FR-4混压板关键的工艺问题进行探讨,以期找到简单可行的解决方案与同行共勉.

摘要： 随着电子、通信产业的飞速发展,高频、RF设计越来越广泛,PCB上越来越多的运用到高频板材来满足信号传输的要求.但是由于高频板材价格较为昂贵,客户从节约成本的角度考虑,在PCB的结构设计上采用混压的方式,即除了必要的信号层采用HydroCarbon/Ceramic(或PTFE/Ceramic)结构的高频覆铜板材,以满足其信号传输速度、信号完整性以及阻抗匹配等要求,其他层采用常规FR-4覆铜板材.显然这样的设计对成本控制有很大的优势,但给PCB加工带来了一些其它问题.本文通过理论和实验对PTFE+FR-4混压板关键的工艺问题进行探讨,以期找到简单可行的解决方案与同行共勉.

摘要： 随着电子、通信产业的飞速发展,高频、RF设计越来越广泛,PCB上越来越多的运用到高频板材来满足信号传输的要求.但是由于高频板材价格较为昂贵,客户从节约成本的角度考虑,在PCB的结构设计上采用混压的方式,即除了必要的信号层采用HydroCarbon/Ceramic(或PTFE/Ceramic)结构的高频覆铜板材,以满足其信号传输速度、信号完整性以及阻抗匹配等要求,其他层采用常规FR-4覆铜板材.显然这样的设计对成本控制有很大的优势,但给PCB加工带来了一些其它问题.本文通过理论和实验对PTFE+FR-4混压板关键的工艺问题进行探讨,以期找到简单可行的解决方案与同行共勉.

摘要： 随着电子、通信产业的飞速发展,高频、RF设计越来越广泛,PCB上越来越多的运用到高频板材来满足信号传输的要求.但是由于高频板材价格较为昂贵,客户从节约成本的角度考虑,在PCB的结构设计上采用混压的方式,即除了必要的信号层采用HydroCarbon/Ceramic(或PTFE/Ceramic)结构的高频覆铜板材,以满足其信号传输速度、信号完整性以及阻抗匹配等要求,其他层采用常规FR-4覆铜板材.显然这样的设计对成本控制有很大的优势,但给PCB加工带来了一些其它问题.本文通过理论和实验对PTFE+FR-4混压板关键的工艺问题进行探讨,以期找到简单可行的解决方案与同行共勉.

摘要： 随着电子、通信产业的飞速发展,高频、RF设计越来越广泛,PCB上越来越多的运用到高频板材来满足信号传输的要求.但是由于高频板材价格较为昂贵,客户从节约成本的角度考虑,在PCB的结构设计上采用混压的方式,即除了必要的信号层采用HydroCarbon/Ceramic(或PTFE/Ceramic)结构的高频覆铜板材,以满足其信号传输速度、信号完整性以及阻抗匹配等要求,其他层采用常规FR-4覆铜板材.显然这样的设计对成本控制有很大的优势,但给PCB加工带来了一些其它问题.本文通过理论和实验对PTFE+FR-4混压板关键的工艺问题进行探讨,以期找到简单可行的解决方案与同行共勉.

摘要： 一种用于皮肤美容仪PLASMA脉冲波控制方法及应用，所属仪器控制技术领域，方法包括设置振荡周期425μs～488μs为基本脉冲波形；以振荡周期425μs～488μs为基本脉冲波形，控制开、关，依次循环；设置输出峰值。本发明提供的皮肤美容仪PLASMA，通过等离子频率振动渗透法，瞬间把美容液(如透明质酸、骨胶原、BOTOX肉毒杆菌、EGF皮肤活化因子、VC等)导入真皮层，使皮肤得到保湿、活化细胞、增加胶原蛋白、淡化皱纹以及美白的效果。

摘要： 一种Plasma机器均匀性测试方法，其包括如下步骤：步骤一、准备若干测试片，将测试片烘烤后放进干燥皿里冷却至常温后称重并做标记；步骤二、将测试片分别放进覆铜治具板内；步骤三、将覆铜冶具板及若干覆铜假板以一定规律放入于Plasma机内；步骤四、Plasma测试；步骤五、Plasma做完后，将测试片自覆铜冶具板内拆下，然后将测试片进行烘烤，之后放进干燥皿里进行冷却至常温，再对测试片进行称重；步骤六、结果计算，九个区域的测试结果百分比均需≥70％才算合格。本发明对整个Plasma机的均匀性及生产产品时的稳定性，进行全方面的评估和监控，从而可确保Plasma机投入量产时性能稳定、产品质量稳定。

摘要： 本实用新型目的在于提供一种离子雷射Plasma薄板用挂架，包括框架和两根档杆，其中，框架包括顶面、底面、左侧面和右侧面，在框架的顶面和底面分别均匀设有复数个接合部，每根档杆的两端分别与接合部接合。本实用新型结构简单，可以改善Plasma对薄板的上板方式，作业时不需要折板，通过改善相邻档杆的相对位置来固定板子，提高生产效率及良品率。

摘要： 本实用新型涉及清洗设备的技术领域，特别是涉及一种PLASMA自动清洁机构，其便于控制超纯水与piranha化学试剂混合的比例，避免了等离子体过渡清洗或难以清洗完全，提高了装置的清洗效果；包括清洗主体、隔板、气管、三通管、两组储液箱、多组直角固定板、两组注液管、两组第一转动轴、两组转动把手、两组第一锥齿轮、两组第二锥齿轮、两组螺管、两组螺杆和两组压板，清洗主体的内部设置有腔室，底端设置有多组支腿，隔板固定在清洗主体腔室上部，并且隔板的右侧设置有出气孔，气管与清洗主体的左端连通，并且气管的一端穿过隔板，三通管的一端与清洗主体的右端连通。

摘要： 本实用新型公开了一种中尺寸显示屏清洁用全自动PLASMA等离子清洗机，包括上料输送机构、上料机械手、对位平台机构、清洗机构和出料机械手；对位平台机构包括X轴平台拖链、X轴平台、Y轴电机和Y轴平台，Y轴平台的下方两侧设置有导轨，导轨固定在X轴平台上，Y轴平台的侧面连接有Y轴拖链；Y轴平台上设置有升降马达，升降马达上连接有升降支撑板；清洗机构包括清洗溶剂桶、清洗溶剂供给泵和PLASMA清洗头，PLASMA清洗头的侧面设置有清洗布放料辊，清洗布放料辊的下方设置有清洗布废料回收辊。本实用新型采用上述结构解决了现有设备清洗速度慢、花费时间多的问题，无需手动，提高了清洗效率，减少了产品表面产生静电，提高了清洗精度。

摘要： 本实用新型公开了一种Plasma焊接系统新型焊接枪，属于汽车制造技术领域，包括支架锁紧环、束弧嘴支架、束弧器、钨针夹、绝缘环和钨针，所述束弧器由陶瓷制成，束弧口为圆孔状，圆孔的直径不小于5mm，钨针位于束弧器开孔中心，焊接枪枪体内设有冷却循环水路，束弧器上装有温度监测仪，焊接枪的控制系统上设有报警装置，本实用新型的有益效果：该装置具备结构简单、方便维修和生产成本低的优点，解决了铜束弧器导致的焊接系统和焊接质量的稳定性较差的问题，大大的提高了Plasma焊接设备的焊接质量，并减少了设备的检修次数，提高了车间的生产效率。

摘要： 本实用新型公开了一种真空镀膜机可拆卸PlASMA电极，包括电极本体，所述电极本体上开设有环形槽，所述环形槽内滑动连接有环形板，所述环形板的外侧壁固定安装有套管，所述电极本体上开设有两个滑槽，两个所述滑槽内均设有阻挡机构，两个所述阻挡机构均延伸至环形槽内并与相对的环形板地底部相抵，所述套管的侧壁设有密封机构，所述密封机构与套管的侧壁之间设有吸附机构，所述套管的侧壁固定安装有安装框，所述安装框上设有卡紧机构，所述卡紧机构贯穿密封机构并与套管的侧壁相抵紧。本实用新型结构设计合理，其能够在电极不使用时，对电极进行有效地密封保护，避免电极长时间与空气接触导致电极被氧化腐蚀，影响电极的正常使用。

摘要： 一种测卷绕镀膜机Plasma温度的装置，包括依次设置的放卷室、放卷辊轴、放卷导向辊、镀膜鼓、收卷导向轴、收卷辊轴，镀膜鼓外套设有镀膜室，镀膜室内均匀设置气体挡板，气体挡板将镀膜室和镀膜鼓之间隔成若干个镀膜腔室，每个镀膜腔室安装有靶材；在镀膜腔室的两个气体挡板靠近镀膜鼓的位置上设置Mask挡板，Mask挡板上均匀设置有热电偶，热电偶与测温仪相连。采用上述技术方案，本实用新型的有益效果是：1.提供一种专业的测量镀膜机Plasma温度的方法，此方法比感温纸测试方法精确，灵敏度高；2.可根据需要，测试一定时间内Plasma温度变化情况；3.成本低，可多次使用。

摘要： 本实用新型公开了一种Plasma除胶薄板框架字母固定磁扣，包括：母栏(1)，所述母栏(1)上开设有规律性的螺纹孔(101)，且数量为偶数个；母扣(2)，设置于两个所述母栏(1)之间，且两个母扣(2)与两个母栏(1)连接成适配于Plasma除胶薄板的图形，所述母扣(2)的两端开设有用于配合所述母栏(1)螺纹孔(101)的通孔(201)，且母扣(2)为金属材料；子扣(3)，位于母扣(2)上，并配合于母扣(2)工作，所述子扣(3)具有磁性，与母扣(2)之间具有吸引力；开关机构(4)，连接于母扣(2)和子扣(3)，使子扣分离或贴合于母扣。本申请通过母扣和子扣的配合实现了对任意厚度的Plasma除胶薄板均可夹持，避免了频繁改动装置的不必要操作。

摘要： 本实用新型涉及一种改善plasma效果的治工具，其包括治具主体、产品槽、侧盖板、固定槽、端盖槽和端盖；所述产品槽设于治具主体表面，所述侧盖板上设有通孔，所述固定槽设于治具主体侧边，端盖槽设于治具主体两端，所述侧盖板上设有固定耳，本实用新型改善了洗plasma治具的等离子清洗效果，提升了清洗效率，值得推广。