自动测试系统中实时测控软件的开发

本文通过实例详细介绍了在自动测试系统中采用 Visual Basic(VB)开发实时测控软件的方法:米用MDI窗体技术设计软件的用户界面:采用动态链接库(DLL)实现对硬件接口的控制:采肜事件驱动编程实现测试软件功能的扩展.同时对测控软件中的数字滤波、信号波形显示等技术进行了介绍.     

18-26S rDNA在4种重楼属植物中的定位

为探讨rDNA在重楼属Paris L.中的分布规律，利用荧光原位杂交（FISH）对4种重楼属植物 的18-26S rDNA进行了定位。所有植物均为二倍体，基因组由A、B、C、D和 E5条染色体构成。（1）滇重楼P.polyphylla var.yunnanensis:2n=10=6m+4t，C和D染色体的 短臂上各有1个18-26S rDNA位点;（2）长柱重楼P.forrestii:2n=10=6m+4t，B染色体的长臂 、C和D染色体的短臂上各有1个位点;（3）五指莲P.axialis:2n=10=6m（2sat）+4t（2sat） +1-2B，C和D染色体的短臂上各有1个位点;在有1个B染色体的细胞中，B染色体没有信号点， 而有2个B染色体的细胞中，只有1个B染色体上有信号点，表明B染色体上有基因存在且其分裂 不均等;（4）大理重楼P.daliensis:2n=10=4m+2sm+2st+2t，C染色体的短臂上有1个位点。1 8-26S rDNA位点不仅出现在染色体的次缢痕上，也出现在非次缢痕位点。另外，4个种中C染 色体短臂末端均有18-26S rDNA。     

Providing Quality Library Service to the Adult Learner: Views of Students,Faculty, and Administrators

Summary

The adult learner in the academic environment faces some unique problems and challenges. Balancing work, family, and a job are just a few examples. Technological changes in information retrieval and research, and in the use of the library can also magnify the adult learner's problems.

The study targets adult learners at Penn State Erie, The Behrend College. Focus groups and questionnaires are used to gather information from both active and non library users among the adult population: their views about the library environment, library resources, service, instruction, other traditional students, and staff. Perceptions about the adult learner are also obtained through face to face interviews with teaching faculty and administrators. Findings from the study will assist librarians to better understand the needs and expectations of the adult learner, and plan accordingly to meet these demands.     

云南边境少数民族县域新型农村合作经济组织发展研究

近年来,云南边境少数民族县域新型农村合作经济组织发展迅速,但整体发展质量不高,市场竞争力不强,规范程度不够,要进一步获得又好又快的可持续发展又面临许多困难。为此,需要政府的高度重视和积极参与,对其进行正确引导、规范发展,并借鉴国内外先进可行经验,找到适合该区域新型农村合作经济组织发展的路子。     

The impact of educational mismatch on firm productivity: Evidence from linked panel data

We provide first evidence regarding the direct impact of educational mismatch on firm productivity. To do so, we rely on representative linked employer–employee panel data for Belgium covering the period 1999–2006. Controlling for simultaneity issues, time-invariant unobserved workplace characteristics, cohort effects and dynamics in the adjustment process of productivity, we find that: (i) a higher level of required education exerts a significantly positive influence on firm productivity, (ii) additional years of over-education (both among young and older workers) are beneficial for firm productivity, and (iii) additional years of under-education (among young workers) are detrimental for firm productivity.     

Returning to school for higher returns

On the basis of those respondents in the National Longitudinal Survey of Youth (NLSY) who change jobs with an intervening period of education reinvestment, the conventional assumption of linearity of log wages in years of schooling is strongly rejected: a typical reinvestment for the 1980 through 1993 period is associated with a rise of about 3.5 percentage points in the estimated return to an additional year of schooling. The estimated marginal rate of return generally rises in the former education level, and reaches the maximum at 15 years of the former level (therefore 16 years of education after reinvestment), where an additional year of investment is associated with a rise in real hourly rate of pay by approximately 20%. Evidence also shows that, while the level of individuals’ risk tolerance affects significantly the probability of returning to school, correcting for sample selectivity makes little difference in the results. Findings in the current paper survive a variety of robustness tests. The current cohort-based evidence is more helpful than existing evidence from cross-sectional data to individuals making schooling decisions.     

基于nRF24E1无线耳麦的设计与实现

介绍了一种基于nRF24E1的应用于家用电视及个人电脑的无线耳麦,详细阐述了无线耳麦的硬件设计方法,说明了语音发送和接收的工作原理,并给出了软件设计的主要工作流程.     

基于CPLD的24路抢答器设计

使用硬件描述语言的,基于可编程逻辑器件(PLD)的数字逻辑电路设计,已逐渐成为数字逻辑电路设计的主流。通过设计常见的多路抢答器为例子,介绍应用CPLD快速设计数字逻辑电路的方法。