Thermally stimulated depolarization currents of crosslinked polyethylene relaxations in the fusion range of temperatures

With thermally stimulated depolarization currents, we researched the relaxations of crosslinked polyethylene as it is used in medium‐voltage cable insulation. Through conventional polarization two heteropolar peaks stand up in the spectra, at 80 and 105 °C. As the sample is annealed, a homopolar peak is developed at about 99 °C. With window polarization, our results indicated that the 80 °C peak is a structured peak related to polar crosslinking subproducts and impurities. The 105 and 99 °C peaks are fitted to the general kinetic‐order model because the 105 °C peak is related to free‐charge detrapping at the crystalline phase, in the bulk and maybe at the amorphous‐crystal interphases, and the peak that is observed at 99 °C is due to injected charge. Annealing at high temperatures promotes the creation of traps in the material. Charge trapping at T < 70 °C seems to be related to the increased insulator resistivity with annealing time. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 1412–1421, 2003     

显像管最大阳极电流测试的探讨

探讨最大阳极电流测试中的几个问题,提出最大阳极电流测试标准修改意见.     

一种新型的锥尖制作方法研究

主要介绍利用反应离子腐蚀和等离子腐蚀相结合的方法制作真空微电子压力传感器中锥尖阵列。探讨合理选择制作材料，优化锥尖形状，锐化锥尖尖度，以提高传感器灵敏度，增大阴极锥尖的发射电流。测试结果表明：优化的锥尖发射电流在电压为3V时可达0．2nA，灵敏度为0．1μA／g。     

长波长PIN／HBT集成光接收机前端噪声分析

文章研究磷化铟(InP)基异质结双极晶体管(HBT)和PIN光电二极管(PIN-PD)单片集成技术,利用器件的小信号等效电路详细计算了长波长PIN/HBT光电子集成电路(OEIC)光接收机前端等效输入噪声电流均方根(RMS)功率谱密度.分析表明:对于高速光电器件,当频率在100 MHz～2 GHz范围内时,基极电流引起的散粒噪声和基极电阻引起的热噪声起主要作用;频率大于5 GHz时,集电极电流引起的散粒噪声和基极电阻引起的热噪声起主要作用.在上述结论的基础上,文章最后讨论了在集成前端设计的过程中减小噪声影响的基本方法.     

温度对扭转光纤环性能的影响

从理论上和实验上研究了温度对扭转光纤环性能的影响.结果发现,当注入线偏振光时,扭转光纤环内存在一个弱主轴,并且其方向会随着温度的变化而偏移;而注入圆偏振光时,输出光仍然是一个比较好的圆偏振光,在同样的温度范围内,椭圆度变化很小.为进一步提高光纤大电流传感器的稳定性研究提供了一个有益的参考.     

一种新型桥路型HTSFCL的实验研究

在研究一种新型桥路型高温超导限流器的限流原理的基础上，研制开发了一台三相600V、故障电流峰值100A的实验室样机．本文介绍了该限流器的功率电路、控制器、低温容器和高温超导磁体等部分的结构特点和功能．在三相系统中进行了各种短路故障限流实验，结果表明该限流器有较强的限流能力和重合闸能力，说明新型高温超导限流器的研究对改善电网动态性能和提高电网电能质量有十分重要的意义．     

Potentialities of substrate-thinning technique to control minority carrier injection in smart power IC's

This paper deals with the evaluation of a substrate-thinning technique as a way to control the substrate current issues. A test structure has been realized on a Smart Power Technology. Comprehension of the phenomena has been validated thanks to TCAD simulation. This technique was then applied to a commercial IC and the authors show that they succeeded to reduce by one decade the collected current on a victim, although the IC has already been optimized with classical solutions.     

Simulation of ion mass transfer processes with allowance for the concentration dependence of diffusion coefficients

The system of equations describing ion transport in a binary electrolyte z _a-z _c with allowance for the linear dependence of the diffusion coefficients on the concentration was analyzed in the framework of the phenomenological Nernst-Planck approach. The expressions are obtained that define concentration profiles of ions and conditions favorable for the limiting current caused by the achievement of the concentration of a saturated solution (in the case of the anodic reaction) and depletion of the near-electrode region in electroactive cations (in the case of the cathodic reaction). The revealed theoretical dependence of the limiting current on the volume concentration of the salt agrees with published experimental data. The voltammetric characteristics of the corresponding systems were calculated. The role of the migrational component of the ion flow is discussed. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 638–642, April, 2006.     

Thermally stimulated current measurements on a UV irradiated organic photoreceptor layer

Thermally stimulated current (TSC) measurements have been performed on a xerographic photoreceptor which has been treated with ultraviolet (UV) radiation. The charge transport layer of the photoreceptor consists of a polyester molecularly doped with an arylamine substituted hydrazone which was observed to undergo UV induced rearrangement to an indazole derivative. The indazole derivative is transparent to the wavelength component inducing the photo-reaction so that the depth of converted material gradually extends farther into the CTL with UV exposure time. The xerographic residual potential variation with irradiation time is attributed to the formation of a potential barrier to transfer of charge from hydrazone hopping states to indazole hopping states. The mobility activation energy obtained from TSC measurements is 0.22 eV for unirradiated material, which decreases to 0.12 eV after 1200 s of irradiation. The latter energy is identified as a signature of the potential barrier. This identification is corroborated by the correlation between the decrease of the residual potential and the increase of the TSC activation energy after 3600 s of irradiation.     

Meson spectroscopy with confined one gluon exchange potential

Confined gluons-exchange among relativistically confined quarks is used to calculate the ground state masses and the radially excited states of pseudo scalar and vector mesons. A good agreement is obtained with the experimental masses. The limitation of the perturbative treatment of estimating theN−Δ andπ−ρ splitting using one-gluon-exchange potential is pointed out.