PLC控制电梯教学模型的研发

介绍了用梯形图设计并制作了用可编程控制器（PLC）控制的现代电梯控制装置的实验模型.该模型为5层楼电梯控制,电机的正反转由一个正负12V的电源供电,所有指示灯由一个正5V的电源供电;楼层信息由一个74LS48译码芯片驱动的共阴极的数码管显示.在硬件电路连接好后,向PLC传送编好的控制程序,它能按预先的逻辑较好地完成电梯的控制.实践证明,可编程控制器在工业自动化中的运用和实现工业控制的智能化、稳定性和安全性都具有重要的实际意义.     

N(2,2,0)代数的理想与关联理想

通过研究N（2,2,0）代数的理想、关联理想及相互关系,进一步刻划了N（2,2,0）代数的特征．     

关于N(2,2,0)代数的正规非零零因子的若干结果

引入N（2,2,0）代数的正规非零零因子的概念,得到正规非零零因子的若干性质．     

Ethnic identity: Myth and reality in Western Canada

The paper analyzes eleven research projects which have focused on the issue of ethnic identity. Each study addresses the question of how important ethnicity is to the individual. The results suggest that ethnicity, as measured in the present studies, is of little importance to Canadians. Ethnicity, however, should be viewed as an adaptive response to the conditions governing the context for acquisition of scarce and desired goods! What is clear is that assertions of the universal and constant import of ethnicity to Canadians are not true.     

乡镇卫生院五官科医师现状与培训对策

本文通过对金华市所有乡镇卫生院调查，结果发现310所乡镇卫生院只有12名五官科医师(专职8名、兼职4名)，五官科医师在乡镇卫生院相当缺乏；进一步分析发现乡镇卫生院五官科医师学历与职称偏低、年龄偏轻、工作时间短、缺少培训及进修机会，检查设备、手术器械缺乏，能开展的手术档次低、例数少。并根据乡镇卫生院五官科医师的现状我们提出了一些相应对策，供有关部门参考。     

The intercultural reentry: Conceptualization and directions for future research

While there has been extensive research on the cultural adjustment of sojourners to a foreign culture, there has been a dearth of literature examining the adjustment of returning sojourners to their home culture (reentry). In order to further understanding of this phenomenon, this article discusses the reentry process as one type of cultural adjustment. First, reentry is defined and described. Secondly, research investigating the two processes of adjustment to a foreign culture and readjustment to the home culture is reviewed, and the two processes are compared and contrasted. Finally, suggestions are made concerning future research.     

Toward a unified conception of intercultural communication: An integrated systems approachVers un approche systemique et unifié de la communication interculturelle

Intercultural Communication theorizing appears to be divided into two schools, one stressing the personal psychological level, the other stressing the interpersonal process level of the communication vehicle itself. Neither is in itself sufficient for future theory building in the field. Towards a unifying systemic approach in intercultural, different theoretical perspectives are briefly reviewed in regard to these schools and a conception entailing intrapersonal (cognitive), interpersonal (interpretive) and systemic (synthetic) categories are derived. This approach clarifies and integrates some present theoretical insights of the field into a more comprehensive whole.     

N2O的工业分解方法

本文介绍了N2O的高温直接分解法、催化剂分解法,催化剂分解法反应原理和工艺流程。     

面向作物产量和环境双赢的氮肥施用策略

我国是世界上最大的化学氮肥消耗国,总用量达到了全球总量的33%。但是氮肥的过量施用并没有带来持续的作物高产,反而造成了一系列的环境问题。文章综述了我国近30年来农田土壤氮素的收支和利用率情况,分析了我国农田土壤氮素的去向及其环境影响,重点论述了如何通过氮肥合理管理来实现粮食安全和环境可持续发展的双重目标。     

内蒙古河套灌区农田生产和乌梁素海湿地保护综合模型分析

灌溉农业是世界上常见的生产活动之一,但失衡的农业生产会造成周边湿地退化和生态系统服务功能降低。本文通过建立农田生产和湿地保护综合模型,模拟内蒙古河套灌区农田-乌梁素海湿地生态系统价值的变化规律,以寻求实现农业和湿地生态系统价值最大化的措施。以2002年的数据作为基准,控制其他因素不变的情况下,模型分析得到当施肥量为 252.3 kg N/hm²时,系统的总价值量达到最大,为24.40×10.8元。此外,湿地子系统价值和河套灌区的引水量成正比,和农田灌溉配额成反比。将农田灌溉配额减少60％,系统总价值将增加70％。因此,在目前灌区可供水量有限的情况下,控制农田施肥量和降低灌溉配额是保持河套灌区农业生产和乌梁素海服务价值最优化的有效措施。