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1.
交流电晕对高温硫化硅橡胶性能的影响   总被引:7,自引:0,他引:7       下载免费PDF全文
采用针-板电极交流电晕放电试验装置研究了电晕放电对高温硫化硅橡胶憎水性、不同温度下憎水恢复性、力学性能和电气性能的影响,结果表明电晕放电作用不同时间后高温硫化硅橡胶材料憎水性丧失是一个渐进的过程,严重时硅橡胶材料憎水性会暂时性丧失,硅橡胶材料在不同温度下憎水性恢复速度不同,电晕放电作用后硅橡胶材料憎水接触角不能恢复至新试样初始水平.电晕放电不同时间后硅橡胶材料表面受电晕放电影响的范围逐渐扩大,表面产生了黑色粉末状电晕环,前期发展较快,然后逐渐由表层损坏转为纵深方向发展,材料表面和内层均可能遭到不同程度电蚀损,硅橡胶主链基团Si—O—Si、侧链基团Si—CH3和甲基中C—H键相对强度均随着电晕放电作用时间的增加呈下降趋势,材料拉伸强度和硬度有所下降,介电性能明显下降.  相似文献
2.
A small batch reactor is developed to study the removal of phenol from a thin layer of water by creating pulsed corona discharges above the water. Pulses of up to 40 kV are applied with a duration of ~50 ns and an energy of ~60 mJ. In this CAW (Corona Above Water) reactor an ozone yield of upto 90 g/kWh is obtained in ambient air. The phenol degradation is 48 g/kWh, using a 1 mM initial concentration in demineralized water. The degradation yield increases to almost 100 g/kWh by adding to the water either H2O2 or Fe2SO4 or NaOH. The first two additions are considered to increase to amount of OH radicals. In the case of NaOH addition it is observed that much more ozone dissolves in the water. The addition of the OH scavenger t-butanol shows that in most cases the main oxidation route of phenol in the CAW reactor is direct ozone attack.  相似文献
3.
The energy transfer efficiency from pulse generation circuit to corona discharge reactor was investigated. To find the optimum energy transfer condition, we varied the value of the pulse-forming capacitor in pulse generation circuit. Maximum energy transfer from pulse generation circuit to corona discharge reactor was achieved when the ratio of the pulse-forming capacitance to the geometric capacitance of the reactor was around 3.0. From the analyses of the voltage and current waveforms, we found that the capacitance of the reactor increases about three times, due to the corona development. This increase is the reason why the maximum energy transfer occurs when the pulse-forming capacitance is three times larger than the initial capacitance of the reactor. The energy consumption for removal of nitric oxide was also minimized at this capacitance ratio.  相似文献
4.
电晕放电二氧化碳冷等离子体转化特性研究   总被引:4,自引:3,他引:1  
在常压、室温条件下利用电晕放电使二氧化碳通过冷等离子体反应分解为一氧化碳和氧气,由四极质谱在线定量在分析产物组成。考察反应条件(电晕类型、能量密度、气体流量等)对反应转化率的影响,分析了该反应的能量效率。当放电功率为40W、CO2流量为30mL.min^-1时,正电晕等离子体CO2分解反应的转化率为15.2%;CO2,专座经率随体系能量密度的增加上升,随反应时间的增加而增大,当CO2流量为90mL.min^-1、正电晕放电功率为37.6W时,反应体系的能量效率为5.89%。实验发现,正电晕放电时CO2的转化率高负电晕的转化率。  相似文献
5.
电晕-催化相结合降解二氯甲烷   总被引:4,自引:0,他引:4       下载免费PDF全文
姜玄珍  郑雷 《催化学报》1997,18(4):348-350
6.
利用目前在等离子体特性诊断方面较为先进实用的发射光谱法,在常温常压下测量了正脉冲电晕放电空气中的N2(C3 Πu →B3 Πg) 发射光谱相对强度沿线- 筒式反应器的径向分布,由此得到了正脉冲电晕放电等离子体中高能电子( ≥11 .03eV) 的电子密度沿线- 筒式反应器的径向分布.随径向距离增大高能电子密度呈非线性递减,对于不同放电电压这种递减规律相同.  相似文献
7.
(SO_2,N_2)气体中脉冲放电SO发射光谱测量实验研究   总被引:3,自引:0,他引:3  
采用SO2、N2混合气体和纳秒级脉冲电源在常温、常压下测量了SO2产生的碎片SO(A→X)发射光谱,从微观上研究了SO2的去除过程,为脉冲电晕放电烟气脱硫的深入研究提供了实验依据.  相似文献
8.
Degradation of Organic Contaminants in Water by Pulsed Corona Discharge   总被引:3,自引:0,他引:3  
Degradation of organic contaminants in water by high-voltage pulse discharges was investigated. The effects of gas flow rate and liquid conductivity on the degradation of 4-chlorophenol were studied. With the increase of time, the liquid conductivity increases, which have an important effect on discharge. Meanwhile, with the increase of time, the concentration of H2O2 increases. Addition of 200 mg/L H2O2, the conversion of 4-chlorophenol was greatly enhanced. This may be due to the synergistic effect of high-voltage pulsed discharge and H2O2. Also, it was found that the influence of quantity of TiO2or CuO on degradation of acetophenone is not apparent, maybe the presence of metal oxides hinders the formation of plasma channel due to increase of collusions between metal oxides and oxygen.  相似文献
9.
含氢硅油表面接枝改性PET织物的拒水性能   总被引:3,自引:0,他引:3  
通过接枝率、接触角、透水时间、拉伸应力应变、ESCA的测定以及不冲击实验研究了在DCP和BP等存在下电晕放电引发含氢硅油接枝PET织物及其拒水性能,实验结果表明:电晕放电能有效引发含氢硅油在PET织物表面的接枝共聚反应,随电晕放电处理时间的延长,PET织物表面接枝率增大;接枝后PET织物拒水效果明显增强;电晕放电引发接枝改性后PET织物无损伤,力学性能基本保持不变。  相似文献
10.
Uneven dielectric barrier discharge (DBD) reactors driven by positive–negative pulse plasma discharges were investigated for particulate matter (PM) removal from a diesel engine. Two kinds of uneven alumina plates and three kinds of uneven stainless steel plates were used to assemble six kinds of uneven DBD reactors of discharge gaps 0.4–1.0 mm. The experimental results show that PM from diesel engines can be removed using the uneven DBD reactors. The maximum PM removal was 67% at 300 W energy injections using the DBD reactor of 0.4 mm gap distance. PM removal increased with decreasing gap distance. The energy efficiency using the uneven DBD reactor of a shorter gap distance was higher than that using the uneven DBD reactor of a longer gap distance as the uneven DBD reactor of a shorter gap distance has a higher PM deposition rate. The energy efficiency was typically in a range of 3–10.6 g/kWh at an energy density of 2–16 J/L. A comparison of this study with reports given by other research groups is given.  相似文献
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