Possible triggering of solar activity to big earthquakes (Ms ≥ 8) in faults with near west-east strike in China

A big earthquake (Ms = 8.1) occurred at western Kunlun Mts gap on November 14, 2001. It is the biggest earthquake in China in the past 50 years and the only one with a magnitude bigger than 8 in China after Dangxiong Earthquake (M = 8) in Tibet in 1951. The big earthquake has drawn wide attention of scientists in seismological, geophysical, geological and astro-geodynamic circles. Scientists are interested in the occurrence regularity of the very big earthquakes and try to find out the fac…     

浅谈电流互感器在电机试验中的正确使用

指出了电流互感器的测试准确度对电机性能的影响,分析了电流互感器产生误差的原因及其影响因素,提出了几点防范措施。     

我国监理企业现状及其问题根源

从我国建设监理制度的发展历程着手,分析了我国监理企业现状、监理行业所面临的困境及其内外部原因,深入探讨了监理行业目前存在的严重影响其发挥作用和发展后劲的问题。     

磁光玻璃光纤的偏振特性及其在全光纤电流传感器中的应用

在磁光玻璃裸光纤偏振特性研究的基础上，研制磁光玻璃光纤，偏振特性及其在全光纤电流传感器中的应用。将采用模管法拉制成的磁光玻璃光纤置于亥姆霍兹线圈产生的磁场中，当线偏振光通过该光纤时，其偏振面旋转一定角度，把该角度转换成光信号的强度，然后再用仪器进行检测。通过对线偏振光偏振面在磁场中的偏振特性的测试与实验，提出用磁光玻璃光纤构成的全光纤电流传感器，可用于电流和磁场测试。     

消弧方法及其新思路

对当前社会普遍流行的两种消弧方法进行分析,提出用可调电抗器来灭弧的新思路。     

电工学中交变电流一些难点释疑

对电工学中有关交变电路学习的一些难点,如交流电的有效值,电感、电容对交变电流的作用,感应电动机的工作原理及输电等进行了阐述。     

On the effect of a longitudinal magnetic field on oscillatory characteristics of a subnormal region in discharge in argon

Oscillating nature of current pulses under d.c. excitation in subnormal region with longitudinal magnetic field at pressure range 0.20 torr to 0.85 torr have been studied. The frequency, bandwidth, peak-peak voltage, cut-off current and rise time of the current pulses have been observed with pressure, average tube current and magnetic field. A study of these oscillograms in magnetic field, average tube current and pressure are presented. The probable mechanism for the generation of oscillation based on space-charge field modification with magnetic field is discussed     

Study of thermal aging effect on space charge in poly(methyl methacrylate)

Charges evolution in poly(methyl methacrylate) (PMMA) samples under thermal aging effect has been studied by means of two complementary techniques, thermal step method (TSM) and thermally stimulated depolarization current (TSDC). For the first method, measurements reveal that injected charges, whose quantity is found depending on the number of applied temperature cycles, remain close to the surface sample. TSDC measurements have been carried out for different temperatures ranging from 25 °C to 140 °C. Three distinguishable dipolar relaxations (β₁, β₂ and α) have been highlighted. In the same way, the presence of polarization and injected charges has been confirmed. In support of electric characterization, X-ray reflectometry has been used. The obtained results equally emphasized the thermal aging effect on the material.     

Analysis of Threshold Current and Wall-Plug Efficiency of Diode Lasers with Asymmetric Facet Reflectivity

Threshold current and differential quantum efficiency of broad contact lasers with asymmetric facet reflectivity are discussed with the purpose to reveal factors essential for optimisation of the wall-plug efficiency of such lasers. Lasers with low front facet reflectivity and short cavity often exhibit behaviour difficult to explain with a classical theory. More rigorous calculation performed in this work show that differential quantum efficiency is indeed less affected by a change of the front facet reflectivity or cavity length than predicted by such theory. These findings greatly simplify criteria for optimisation of the wall-plug efficiency of broad contact lasers with coated facets.     

N=1扰动超共形孤子理论与超Leibniz法则与量子守恒流

利用Ｎ＝１扰动超共形场论研究超对称ｓｉｎｅ－Ｇｏｒｄｏｎ理论，借助于超Ｌｅｉｂｎｉｚ法则求出了一组量子守恒流的一般形式．