共查询到18条相似文献,搜索用时 78 毫秒
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一种用于CTCP技术的新型脉冲等离子体光源 总被引:1,自引:0,他引:1
继续沿用传统PS版的计算机直接制版技术(CTCP)对于我国的印刷包装行业具有特殊重要的意义。亟待解决的问题是实现光源对PS版的脉冲式曝光。本文报道了一套采用正弦脉冲高频电源激励的新型氮气等离子体光源,首次获得了光源的准脉冲输出,并成功的对一种超感度PS版进行了曝光。光谱分析表明氮气等离子体光源的光谱结构较碘镓灯更适于传统PS版曝光。进一步从电源电压、工作气压等方面探讨了光源的最佳运行参数,随着电源功率的增大和光源结构参数的优化,可望得到更大的光输出功率。本文对实现CTCP技术的脉冲式曝光具有一定的参考价值。 相似文献
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我国的印刷制版行业目前正处于从传统PS版向计算机直接制版(Computertoplate)技术转变的进程之中,PS版的产销量十分可观,在CTP技术中继续使用传统的PS版对我国印刷包装行业意义重大。实现传统PS版的CTP技术关键在于解决曝光光源问题。本文采用连续直流源空心阴极放电方式产生氮气等离子体蓝紫光源,成功地对一种超感度重氮萘醌系PS版进行曝光,从注入功率、放电气压等方面探讨了氮气等离子光源的最佳工作条件,在工作气压70Pa、放电电压580V、电流1.8A下获得了0.46mW/cm2的蓝紫光输出。气体放电光源还可轻易实现高频大功率脉冲输出,本研究结果表明,新型空心阴极氮气等离子体光源在实现PS版CTP技术方面具有一定的发展前景。 相似文献
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采用多电极介质阻挡放电低温等离子体处理印染废水进行中试研究。考察容积为15 L的反应器在不同的输入电压、脉冲频率、溶液初始浓度、气体流速等条件下对甲基橙溶液的降解效果。结果表明,降解效果随输入功率电压的增加而先增加后降低,且在100 V时降解效果最佳,50 mg/L的甲基橙溶液20 min的脱色效率为98.08%,200 mg/L的甲基橙溶液60 min的脱色效率为99.12%;对50 mg/L的甲基橙溶液20 min COD的降解率为29%,连续降解60 min COD的降解率达57%。同时,气体流速也是工业应用中需要重视的影响因素之一。 相似文献
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采用针-板式高压脉冲放电等离子体反应器处理苯酚有机废水。考察了脉冲电压峰值、电极间距、氧气鼓入量、溶液初始pH值等因素对苯酚去除率的影响,脉冲电压峰值的增加,电极间距的减小,氧气鼓入量的增加,废水初始pH值的增加都有利于苯酚去除率的提高。在脉冲电压峰值为35kV,电极间距为20mm, 相似文献
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低温等离子体技术作为一种新型的高级氧化工艺,由于其高去除率和环境相容性,近年来受到广泛关注,其中不同电极材质的等离子体放电特性对于污染物的降解有重要影响。研究采用一种介质阻挡放电式等离子体装置,以甲基橙模拟废水为处理对象,对不同材质电极(钨、不锈钢和铜)放电条件下的电学特性和甲基橙去除效果进行了研究,并初步探讨了主要的影响机制。结果表明,电极材料主要通过改变放电过程的能量输入来影响甲基橙的降解,每个交流周期中,受电极本身功函数和硬度的影响,电极的击穿电压不同;铜电极击穿发生较早,电流幅值和能量注入更大,放电功率相应最高。对甲基橙的去除效果为铜>钨>不锈钢,其中铜和钨电极下甲基橙去除率均可达90%以上,而不锈钢电极仅为78%。不同电极放电过程中产生的H2O2和O3不同,与O3相比,H2O2生成量受放电功率的改变影响更显著,且与不锈钢电极相比较,铜电极下的放电功率可增加5%,O3和H2O2 相似文献
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含苯酚废水有毒、 难降解,其排放给周边环境带来了严重的污染.本文采用电弧放电等离子体对苯酚进行了处理.通过实验考察了污染物浓度、电压、反应时间和溶液pH值对对苯酚去除的影响.实验结果表明:浓度为100 mg/L,电压为8 kV,放电处理时间为5 min,pH 2~4之间时,苯酚的降解率达到最大.研究结果为工业废水的处理... 相似文献
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本文利用直流空心阴极放电方式产生了一种新型氮气等离子体蓝紫光源,实现了针对传统的预涂感光版(PS版)的感光,当N2气压70 Pa、放电电压580 V、电流1.8 A时,产生的蓝紫光功率密度为0.46 mW/cm2.本文进一步从曝光前后颜色密度值变化、感光材料红外分析方面,对PS版的曝光效果做了详细的测量. 相似文献
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Gehad M. Abd El-Gelil Moustapha S. Mansour Ebrahiem Esmail Ebrahiem Ahmed H. EL-Shazly Hanaa Abou-Gabal 《化学工程与技术》2020,43(10):2015-2022
Corona treatment of Eosin Y-contaminated water by using a dielectric material that covers the ground electrode to avoid spark discharge (causing erosion), reduce charge leakage, and improve the electric field (as stored electrons and charges) was investigated. Elimination of the organic pollutant by gas-phase discharge above the liquid surface in a point-to-plate configuration with multiple needle electrodes was studied. Eosin Y was chosen as model contaminant because of its toxicity and structure that is hard to degrade. Variables such as solution conductivity, dye concentration, pH, air gap, number of needles, and electrode materials were considered. The degree of removal increases with increasing acidity, decreasing concentration, and increasing number of pins. 相似文献
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The decomposition of CHF3 in a mixture with O2 and Ar was investigated in a coaxial dielectric barrier discharge at atmospheric pressure. CHF3 decomposition increased linearly in regard to specific energy input (SEI), whereas energy efficiency decreased. The main product was CO2, and its selectivity increased with high SEI and the presence of O2 in the feed, but an increase of O2 in the feed led to a decrease in decomposition rate. An increase in total flow rate led to an increase of the absolute amount of CHF3 decomposition and energy efficiency; however, the decomposition of CHF3 decreased. A complete CHF3 decomposition occurred under an SEI of 1.54 kJ/L with the selectivity of CO2 and CO as 89.87% and 7.00%, respectively. Optical emission spectroscopic analysis could explain the available reaction pathways for CHF3 decomposition in the CHF3/O2/Ar atmospheric plasma and show the possibility of F2 and HF formation. 相似文献
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Xinni Liu Zhishang Wang Jiaxin Li Yiming Wang Yuan Sun Di Dou Xinlei Liang Jiang Wu Lili Wang Yongping Xu Dongping Liu 《International journal of molecular sciences》2022,23(9)
In this study, humidified air dielectric barrier discharge (DBD) plasma was used to inactivate Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and bacteriophages in biofilms containing DNA, NaCl, carbohydrates, and proteins. The humidified DBD plasma was very effective in the inactivation of microbes in the (≤1.0 μm) biofilms. The number of surviving E. coli, S. aureus, and bacteriophages in the biofilms was strongly dependent on the constituent and thickness of the biofilms and was greatly reduced when the plasma treatment time increased from 5 s to 150 s. Our analysis shows that the UV irradiation was not responsible for the inactivation of microbes in biofilms. The short-lived RONS generated in the humidified air DBD plasma were not directly involved in the inactivation process; however, they recombined or reacted with other species to generate the long-lived RONS. Long-lived RONS diffused into the biofilms to generate very active species, such as ONOOH and OH. This study indicates that the geminated NO2 and OH pair formed due to the homolysis of ONOOH can cause the synergistic oxidation of various organic molecules in the aqueous solution. Proteins in the biofilm were highly resistant to the inactivation of microbes in biofilms, which is presumably due to the existence of the unstable functional groups in the proteins. The unsaturated fatty acids, cysteine-rich proteins, and sulfur–methyl thioether groups in the proteins were easily oxidized by the geminated NO2 and OH pair. 相似文献
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塔中Ⅰ号气田开发试验区10亿方试采地面建设工程作为沙漠地区高含硫碳酸盐岩开发的先导试验工程,对塔中奥陶系碳酸盐岩高含硫油气藏规模开发具有重要意义。工程投产后集输工艺不能完全适应碳酸盐岩油气藏不断变化的要求,优化改造了油气集输工艺,改造后基本能满足碳酸盐岩油气藏开发需要,对后续集输工艺设计提出了建议。 相似文献