霍尔效应回转器

本文从理论上论证回转器是一种具有回转阻抗性能的传输元件,可用霍尔效应实现回转器。     

企业为什么选择发行优先股?--企业财务困难的预期成本与普通股定价状况的分析

本文发展并检验了这样一个假设:较高的财务困难的预期成本和普通股定价不过高这两个因素的共同存在,导致了企业管理层在发行新证券时选择发行优先股而不是债券或普通股.本文的发现是,优先股的发行企业,与它们的行业均值相比,具有更大的财务困难的可能性和普通股定价不过高的可能性.优先股的发行企业,与债券的发行企业相比,具有更大的财务困难的可能性.优先股的发行企业,与普通股的发行企业相比,具有更大的普通股定价不过高的可能性.二项Logit模型的回归分析,也完全证实了以上结论.财务困难可能性较大的企业,更可能发行优先股而不是债券.普通股定价不过高的可能性较大的企业,更可能发行优先股而不是普通股.     

Evaluating DISCOVER's Effectiveness in Enhancing College Students' Social Cognitive Career Development

College students (20 women, 14 men) seeking career counseling services at a university career center participated in this exploratory investigation. A 2 (DISCOVER treatment) × 2 (counseling treatment) research design was used to evaluate the individual and combined effects of DISCOVER (ACT, 1998) and counseling on participants' career decision‐making self‐efficacy and career decision‐making attributional style. Findings revealed a significant effect of the use of DISCOVER on participants' career decision‐making self‐efficacy and their sense of control over the career decision‐making process. Results are discussed regarding the implications for career counseling and ideas for further research in this domain.     

刚体转动渐进跟踪控制的逆系统方法

逆系统方法是以非线性控制为目的,以直接分析为途径,以动态系统的逆概念为核心。该文将逆系统方法应用于刚体动力学中,运用非线性控制的逆系统方法设计Euler动力学方程的控制器,通过对一个陀螺的外力矩进行实施控制,使刚体在动坐标系下的角速度稳定跟踪指令,来实现对刚体转动的渐进跟踪控制。     

Asymptotic bias in the linear mixed effects model under non-ignorable missing data mechanisms

Summary.  In longitudinal studies, missingness of data is often an unavoidable problem. Estimators from the linear mixed effects model assume that missing data are missing at random. However, estimators are biased when this assumption is not met. In the paper, theoretical results for the asymptotic bias are established under non-ignorable drop-out, drop-in and other missing data patterns. The asymptotic bias is large when the drop-out subjects have only one or no observation, especially for slope-related parameters of the linear mixed effects model. In the drop-in case, intercept-related parameter estimators show substantial asymptotic bias when subjects enter late in the study. Eight other missing data patterns are considered and these produce asymptotic biases of a variety of magnitudes.     

Corporate funding of the arts in a turbulent environment

Focusing on funding in culture and the arts, the author identifies a distinctive logic of company support for nonprofit organizations. Business giving is increasingly disciplined around company objectives, giving levels are driven by pretax earnings, and giving decisions are the province of managers who draw advice less from the arts community or public agencies than from other companies. At best, turbulence in government funding has modest effect on corporate support. In turn, change in corporate support has little impact on public backing. The separate logics of corporate and government support imply separate and distinctive long-term development strategies for nonprofit organizations.     

借优势强镇发羊财富民——瓦房店市东岗镇加快产业结构调整步伐

东岗镇以自己自然概况的三大优势,显示经济发展的无限生机.一是地理优势,东岗镇是辽宁省瓦房店市西部的一个依山傍海的中型乡镇,全镇总面积139平方公里,年无霜期165-195天,气候温和,光照充足,冬无严寒,夏无酷暑,四季分明.     

论电视现场报道的特色与创新

电视现场报道是社会人群求新求真和认识多元化的产物。现今的电视现场报道可以概括为三种形式 :主体式报道、客体式报道和主客体交融式报道。在此基础上的电视现场报道的发展和创新应该是新闻故事化和故事情节化、创造性地运用蒙太奇手段、正确过程画面和声音细节 ,并尽可能做到一个时空展现一个事件