常压辉光放电等离子体研究进展及聚合物表面改性

综述了常压辉光放电等离子体(APGDP)的产生机理及研究进展。介绍了难以产生稳定的APGDP 是由于辉光放电容易向细丝放电和弧光放电过渡,其解决措施是选择合适的介质板材料、电极间距、电源电压及频率、气体成分等。指出APGDP对化纤聚合物表面改性的效果与聚合物的分子结构、等离子体气体、介质板材料等因素有关,且改性效果具有时效性,要根据聚合物的分子结构选择合适的等离子体。     

长钻孔分段压裂增透技术在抽采煤层瓦斯中的研究与应用

针对重庆地区地质条件的复杂性,在研究定向长钻孔分段压裂技术装备的基础上,成功在松藻煤矿实施了定向分枝长钻孔分段压裂试验,实现对每个分支孔的单独压裂施工。与该煤矿常规压裂钻孔相比,定向分支长钻孔分段压裂后,平均瓦斯抽采流量提高了7.12倍,平均瓦斯抽采浓度在30%以上,取得了良好的效果,达到了大幅提高煤矿瓦斯抽采效率、缩短抽采达标时间、降低瓦斯治理成本的目的,提升了煤矿的安全水平,为煤矿安全高效生产奠定了基础。     

定向长钻孔水力压裂技术在煤矿瓦斯治理中的应用

针对高瓦斯松软破碎煤层通透性差,导致瓦斯抽采效率低这一问题,以王坡煤业3号煤为工程背景,进行了长钻孔水力压裂技术研究,分析了水力压裂机理过程,并在3301底抽巷进行了水力压裂施工,通过监测压裂过程水压变化情况,对水力压裂过程进行了详细跟踪,最终通过对比压裂前后煤层物理参数变化以及瓦斯抽采效果,得出了长钻孔水力压裂技术对松软破碎煤层的增透效果显著,瓦斯抽采效率得到了显著提高。     

等离子体辅助球磨对Al+C_4H_4N_4合成超细AlN的影响机制

对铝(Al)和二氨基马来腈(C_4H_4N_4)的混合物分别进行等离子体辅助球磨和普通球磨,研究等离子体辅助球磨活化对合成AlN的作用机制。结果表明:相对于普通球磨,等离子体辅助球磨更有利于Al粉的晶粒细化和晶格畸变,并有利于形成Al-C_4H_4N_4纳米级的复合结构。辅助球磨中的等离子体促进C_4H_4N_4的脱胺,使C_4H_4N_4分解出更多的游离含N基团,加速与活化的Al合成AlN,辅助球磨14 h后AlN的转化率达到91%,远高于普通球磨合成AlN的产率83%。等离子体辅助球磨8 h的Al+C_4H_4N_4前驱体发生氮化反应的激活能为353.46 kJ/mol,在Ar中于800℃保温1 h可以通过固-固反应机制全部转化为超细AlN,而普通球磨8 h的前驱体反应激活能高达441.21 kJ/mol,Al需熔化后才能进行氮化反应,导致部分C_4H_4N_4先行受热分解蒸发,AlN产率仅为86%。辅助球磨促进AlN合成的主要原因是等离子体放电的高频脉冲轰击和瞬态"电火花"对粉体产生协同球磨作用。     

Spectroscopic study of bipolar nanosecond pulse gas-liquid discharge in atmospheric argon

Atmospheric gas-liquid discharge with argon as a working gas is presented by employed nanosecond pulse power. The discharge is presented in a glow-like mode. The discharge powers are determined to be less than 1 W, and remains almost constant when the discharge duration time increases. Bountiful active species are determined by capturing optical emission spectra,and their main generation processes are also discussed. The plasma gas temperature is calculated as 350 K by comparing the experimental spectra and the simulated ones of N_2(C~3Ⅱ_g→B~3Ⅱ_g, Δv =-2). The time resolved vibrational and rotational temperature is researched to present the stability of discharge when pulse voltage and discharge duration vary.The electron density is determined to be 10~(16) cm~(-3) according to the Stark broadening effect of the H_α line.     

Sheath Structures of Strongly Electronegative Plasmas

The sheath structures of strongly electronegative plasmas axe investigated on basis of the accurate Bohm criterion obtained by Sagdeev potential. It is found that the presheath transition between the bulk plasma and the sheath almost does not exist there, and that distributions of electrons, negative and positive ions in the sheath form a pure positive ion sheath near the boundary of the electrode. Furthermore, the density distribution of space net charge has a peak near the sheath edge, the spatial potential within the sheath falls faster, and the sheath thickness becomes thinner.     

出口BS90A钢轨生产工艺研究

针对出口孟加拉国BS90A钢轨的断面特点及技术要求，优化设计了孔型参数、轧辊及导卫装置，探索出了一套合理可行的生产工艺。     

The Study of Active Atoms in High-Voltage Pulsed Coronal Discharge by Optical Diagnostics

In this study, the emission spectra of active atoms O (3p^5p → 3s^5S^02 777.4 nm),Ha (3P→2S 656.3 nm) and N (3p^4P→ 3s^4S^0 742.3 nm, 744.2 nm, 746.8 nm) produced by thepositive high-voltage pulsed corona discharge (HVPCD) of N2 and H2O mixture in a needle-plate reactor have successfully been recorded against a severe electromagnetic interference coming from the HVPCD at one atmosphere. The effects of the peak voltage, the repetition rate of pulsed discharge and the flow rate of oxygen on the production of those active atoms are investigated. It is found that when the peak voltage and the repetition rate of the pulsed discharge are increased,the emission intensities of those active atoms rise correspondingly. And the emission intensities of O (3p^5P→3s^5S^0 777.4 nm), Hα (3P→2S 656.3 nm) and N (3p^4P→3s^4S^0 742.3 nm, 744.2 nm,746.8 nm) increase with the flow rate of oxygen (from 0 to 25 ml/min) and achieve a maximum value at a flow rate of 25 ml/min. When the flow rate of oxygen is increased further, the emission intensities of those atoms visibly decrease correspondingly. The main physicochemical processes of interaction involved between electrons, neutrals and ions are also discussed.     

陶瓷膜净化百草枯合成液

采用陶瓷膜过滤百草枯合成液,考察压力和温度等关键因素对过滤通量的影响,对膜污染现象展开分析研究,并借助于膜过程进行滤饼层设计与过滤实验考察．研究结果表明：适量添加粉末活性炭能有效改善污染层空隙率,减少孔内污染,拟稳定通量在70～100L／（m^2·h）．而聚丙烯酰胺以及明矾等有机和无机絮凝剂对百草枯合成液的过滤有明显的副作用．     

OTN系统建设规划

本文从OTN技术概况人手,详细说明了OTN系统规划的前期准备以及规划步骤,最后介绍了OTN系统建设的实际实施中的注意事项以及发展前景。