椭圆偏振光的示波展示

从示波器X-Y图示仪波形形成原理出发,展示了椭圆偏振光的合成图像,也分析了椭圆偏振光的左旋右旋情况,从另一角度更直观展示了抽象的椭圆偏振光的合成.     

唐诗里的两极社会透视

从唐诗里采录有关贫、富两阶层两极生活的代表诗篇作为引线,比对了大唐社会上流阶层的繁富豪奢以至腐朽堕落和底层民众艰辛度日的痛苦生存现状。穿越时空,考察、认识大唐帝国繁荣强大的表象背后所隐藏的贫富差距过大、社会两极分化的严峻问题,解析了个别关注草根民生问题的诗人的赤子之心、仁者情怀、忧患意识。指出严重的社会两极分化正是大唐社会不和谐不可持续发展的主要原因。     

关于推导束缚电荷密度的修改意见

在通常推导束缚电荷密度的过程中,笼统的将nql看作电极化强度是不准确的,提出了修改意见.     

民族地区图书馆数字化建设两极分化危害之分析

国家民委2007年度科研项目＂中国民族及民族地区图书馆调查与研究＂反映了民族地区图书馆的最新状况.文章将民族地区图书馆分为省级（自治区）图书馆、高等院校图书馆,地市级、市辖区图书馆,自治县、旗基层图书馆3个层次,以网络平台建设、自动化管理、数据库建设为指标,进行横向与纵向的立体交叉比较,分析其数字化建设现状,以具体数字阐明了民族地区图书馆数字化建设的现状：高等级图书馆与县、旗基层图书馆两极分化现象十分严重,数字鸿沟加剧 民族地区基层图书馆服务功能和生存能力的弱化,损伤了当地的文化事业,减弱了基层政权的舆论宣传力度、文化认同程度,减慢了民族共同心理的发展与升华.     

椭圆偏振光的示波展示

从示波器X-Y,图示仪波形形成原理出发,展示了椭圆偏振光的合成图像,也分析了椭圆偏振光的左旋右旋情况,从另一角度更直观展示了抽象的椭圆偏振光的合成。     

浅议反射光的偏振态

本文讨论了自然光入射到两种介质的交界面时,反射光的偏振状态。发现反射光的偏振态与入射角和两介质的相对折射率有关。     

磁场自旋1/2粒子极化矢量在两种表象中的求解

对自旋1／2粒子在磁场中运动的极化矢量问题,在薛定谔表象和海森堡表象中求解,得出的结果是完全一样的。但应用海森堡运动方程比用薛定谔方程来求解,容易简单得多。因此,一般凡是涉及求解力学量问题,采用海森堡运动方程来解比较方便。     

A new equation for dielectric permittivity of saturated soils based on polarization mechanics

Based on polarization mechanisms, such as electronic, ionic and orientational polarizations, a new equation for dielectric permittivity of soil is proposed to interpret the dielectric behavior of a mixture like soil, in terms of polarization process of its components and the interactions between its components. The dielectric permittivity is expressed in terms of a fre- quency-dependent part and a frequency-independent part. These two parts correspond to polarizations occurred at different fre- quency range. It is a new volumetric mixing model with theoretical background. Based on time domain reflectometry （TDR） measurements of saturated soil samples and test data from literature, comparisons of this model with some well established mixing models show that the curves for saturated sand soils and slurries resulted from the new equation, which agree well with TDR measurements, are close to those calculated from Birchak＇s model.     

Understanding productivity dynamics: A task taxonomy approach

As job markets have been polarizing, firms have been changing their labor inputs. By using matched employer–employee data for Portugal, we examine whether labor market polarization has occurred within or across firms and how labor input upgrades have contributed to overall productivity growth. We develop a firm taxonomy based on worker's occupational data. Firms can be focused on one task – Abstract, Manual or Routine – on a combination of tasks, or none. Results show that Abstract firms are the most productive and their share has increased over time. Manual firms, the least productive, have had a stable share throughout the period. Routine firms have seen their share decline over time. The dynamic decomposition of the estimated productivity reveals that productivity growth is propelled by increased market shares of the most productive incumbents and exiting of the least productive, especially for Abstract firms. Notwithstanding these productivity growth drivers, they fail to avert the productivity stagnation observed in Portugal between 2004 and 2009 due to the overall decline in productivity of incumbent firms, especially Routine. We discuss the policy implications of our results which are relevant to other European economies also lagging behind in terms of knowledge and innovation capabilities.