共查询到17条相似文献,搜索用时 99 毫秒
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微元法研究均匀带电体的电场分布 总被引:1,自引:0,他引:1
《广西物理》2008,(3)
以均匀无限长带电直线的电场分布为基础,运用微元法和叠加原理研究了无限大均匀带电平面和无限长均匀带电圆柱面在其周围电场分布情况。然后根据均匀带电圆环轴线上的电场分布,进一步讨论均匀圆柱面在其轴线上的电场和均匀带电球面在其周围产生的电场,所得结果与高斯定理完全符合。 相似文献
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本文给出当电子为双Maxwell分布且电子温度空间均匀时三流体的一个均匀电场解;由它得出的电子,离子特性与实验和数值计算结果基本符合。
关键词: 相似文献
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带电细圆环与导体球壳系统的场分布 总被引:1,自引:0,他引:1
先依电象法,推导均匀带电圆环在金属导体球壳内的"象电荷";再在球坐标系下,根据电场强度的计算公式与Tay-lor展开式,计算出均匀带电细圆环在全空间的电场分布的级数形式解;进而结合唯一性定理和电场的叠加原理,获得带电细圆环与导体球壳系统的空间场分布. 相似文献
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耐电树枝老化特性是表征聚合物绝缘材料介电性能的重要参数之一.聚丙烯(PP)是典型半结晶聚合物,其复杂的非均匀聚集态结构影响电树枝的生长.本文对PP及加入成核剂的PP试样进行了耐电树枝化性能实验,通过偏光显微镜(PLM)及差示扫描量热法(DSC)分析加入成核剂前后PP的结晶形态、结晶度以及结晶结构对电树枝生长特征的影响.以相界面自由能的热驱动作用以及放电雪崩理论为基础,对电树枝生长的热力学和动力学机理进行分析,阐明电场分布对电树枝生长的重要作用.根据半结晶材料的结晶相和非晶相的物理性能,建立材料内部电场分布计算模型,模拟针-板电极条件下聚合物材料内部的局域电场分布情况,分析了电树枝通道的动力学生长特征,探讨了成核剂改变PP的结晶结构抑制电树枝沿电场生长的作用. 相似文献
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利用静电场模型对线筒式介质阻挡放电电场强度进行了计算,并对电子平均动能进行了估算。通过对单双介质阻挡放电(DBD)的对比,发现在相同的放电条件下,双介质DBD产生的电场强度和电子平均动能比单介质DBD的要大。这就很好地解释了在相同的放电参数下,甲苯的降解效率在双介质DBD中要比单介质DBD中大。 相似文献
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��������ӷ��� 《核聚变与等离子体物理》2017,37(4):399-403
The electric field strength and electron mean kinetic energy in co-axial dielectric barrier discharge (DBD) were estimated based on static electric filed model. Through the comparison of the single dielectric layer DBD with the double dielectric layer DBD, it was found the electric field strength and electron mean kinetic energy in double dielectric layer DBD are greater than that in the single dielectric layer DBD under the same electrode configuration and discharge conditions. The calculation results can successfully applied to explain the toluene degradation efficiency in double dielectric layer DBD is larger than that in the single dielectric layer DBD under the same discharge parameters. 相似文献
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The effect of the electric field on the dielectric and acoustic properties of Pb[(Mg1/3Nb2/3)0.83Ti0.17]O3 single crystals was investigated as functions of temperature and the electric field strength. The dielectric constant and the acoustic mode behaviors exhibited typical relaxor behaviors when there was no bias field. The longitudinal acoustic mode showed splitting under a moderate electric field of 1 kV/cm applied along the [001] direction, indicating coexistence of macroscopic/mesoscopic ferroelectric states and relaxor states. Further increase in the electric field up to 2 kV/cm induced a clear ferroelectric phase transition, which became smeared out due to the proximity of the electric field to the critical point. The electric field-temperature phase diagram of Pb[(Mg1/3Nb2/3)0.83Ti0.17]O3 was suggested based on the observed field-induced changes in the dielectric and the acoustic properties. 相似文献
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Yu. P. Emets 《Technical Physics》2005,50(11):1391-1401
The electric field of two dielectric straight circular cylinders containing line charges on their axes is investigated. The
cylindrical bodies in question are parallel and touch each other from the exterior. They have different dielectric permittivities,
charges, and radii. Also, they are surrounded by an arbitrary dielectric medium. An analytic solution to the respective boundary-value
problem is given, and the most important particular cases are analyzed. Special features of the electric field in the region
around the contact of the dielectric cylinders are studied versus the permittivity of the material used and the relationship
between electric charges. 相似文献
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采用电滞回线方法和偏置直流电场中叠加小交变电场方法研究了锆钛酸铅反铁电陶瓷材料在强电场作用下的介电行为.测量结果显示,锆钛酸铅反铁电材料的介电常数随外加电场强度呈非线性变化,在反铁电 铁电转变的电场区间形成介电峰.表征极化强度随电场强度变化率的微分介电常数εd峰值出现在反铁电 铁电转换电场强度处,最高达到41000.随着偏置电场增加反铁电向铁电体转变过程中,小信号介电常数εc减小;在电场降低铁电回复成反铁电过程中,小信号介电常数εc增大,小信号介电常数εc峰先于微分介电常数εd峰出现.根据电场作用下反铁电
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锆钛酸铅反铁电陶瓷
介电行为
强电场条件 相似文献
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The effect of applied dc bias electric field on dielectric permittivity in bulk La2NiMnO6 is investigated in this paper. It is found that a small bias field of 40 V/cm can greatly reduce the dielectric permittivity around the room temperature, compared to the much larger electric field that is required for conventional ferroelectric materials. The observed giant dielectric tunability is retained over a broad range of around room temperature and is most likely related to the charge ordering of Ni2+ and Mn4+ ions, further confirming the existence of electronic ferroelectricity in La2NiMnO6. 相似文献