液化石油气发动机燃料供给系统的设计方案与性能比较研究

液化石油气(LPG)发动机燃料供给系统已经历了三个发展阶段,国外已开发出第三代产品。将三代LPG发动机燃料供给系统的设计方案作了简要介绍,并对其性能作了比较分析,从中可了解国外LPG发动机燃料供给系统的发展历程以及各阶段的技术关键,供国内同行参考。     

农村精神文明建设现状分析与对策

新时期农村精神明建设出现下滑的趋势，部分农民理想信念淡化，封建迷信沉渣泛起社会治安形势恶化，铺张浪费现象严重。这种局面的形成除了部分领导认识不到位，抓得不力外，也与近年精神明建设投入严重不足及不良的社会大环境有关。因此，解决这些问题，一要提高认识，二要讲求实效，三要加大投     

汇率干预中的多点自由边值问题的数值计算方法

1IntroductionIt is i mportant for the economic development of acountry to maintain the stabilization of exchange rate,so the intervention of exchange rate has become thetopic of the main concerns of the economic and math-ematical circles[1-5].To maintain the stabilization ofexchange rate,many countries use target zone re-gi mes,that is,the central banks intervene in the for-eign exchange market such that the exchange ratestays within the interval[a,b].There are fixed costand cost proportional …     

东汉草书艺术的演变及其精神内质

西汉末至东汉中后期，草书体确立，并由为交流而书写的实用工具升华为一种以审美为最高目标的艺术。这一由实用到审美的演变，不仅标志着中国艺术的观念由非自觉到自觉的飞跃，而且蕴涵了东汉士人精神世界中个体生命意识的自觉和艺术精神的萌生。这一变化，与东汉时期社会思潮的兴替变迁密切相关。     

以人为本创新机制推进和谐校园建设

建设和谐校园是一项系统工程,关键是要牢固确立以人为本的理念,创新建设和谐校园的机制,提高建设和谐校园的能力,实现学校和经济社会的和谐发展。     

让学生成为历史课堂的主人——教学尝试之心得

新课程的关键在于教学创新。如何创新，众多一线教师高招很多，各不相同。笔者近期在高二理科班的历史必修Ⅲ教学中做了一些尝试，旨在充分发挥新课程所提倡的学生主体性和教师主导性相结合的精神，仅供参考。     

Investigation of iodine concentration in salt,water and soil along the coast of Zhejiang,China

Objective: We aim to describe the environment iodine concentration in salt, water and soil along Zhejiang Province coast in the China foreland. It will be helpful for us to judge whether this area is insufficient in iodine and universal iodized salt is necessary or not. Methods: We collected iodized salt samples, drinking water samples (tap water in the towns, and well water or spring water in the villages), water samples from different sources (ditches, lakes, rivers) and soil samples through random sampling in June, 2005. Salt, water and soil iodine was detected by arsenic-cerium redox method. Statistical analysis was expressed as mean±SEMby Windows SPSS 13.0. Results: (1) The iodine concentration in salt was 27.9±4.33 mg/kg (n=108). (2) Seventy-five water samples were collected. The water iodine value was 0.6～84.8 μg/L (mean of 11.66 μg/L). The watershed along the Qiantang River has significantly higher iodine content than the water in Lin'an in mountain area (P＜0.01). The iodine content and mean iodine content of tap water, well or spring water and natural water sources were 4.30±2.43 μg/L (n=34), 23.59±27.74 μg/L (n=19)and 12.72±10.72 μg/L (n=22) respectively. This indicated that among environmental water sources, the ditch iodine content was the highest with river water iodine being the lowest (P＜0.01). (3) Soil iodine value was 0.11～2.93 mg/kg (mean of 1.32 mg/kg).Though there was no statistical difference of soil iodine in different districts (P=0.131), soil iodine content correlated positively with water iodine content. Conclusion: Iodine concentration in salt accords with national policy of adding iodine in salt. Foreland has more iodine in water than mountain area. The data reflected that water and soil iodine in foreland area was not high, which suggests universal iodized salt should be necessary. Environment iodine has relatively close association with pollution.     

8253定时/计数器方式3计数过程的实验研究

对于我系选用教材和部分参考资料关于8253定时/计数器在方式3的计数过程中表述中所存在的矛盾之处,基于武汉众友电子科技有限公司的接口实验台,提出了一个探究8253计数过程的实验方案。通过分析实验结果,指出了正确的计数过程。     

民办高等教育研究综述

随着市场经济的发展和我国办学体制改革的深入,我国民办高等教育开始孕育、诞生和茁壮成长.20年来民办高等教育的发展,为社会的稳步发展进步、经济的迅速发展和国民素质的不断提高发挥了不可估量的推动作用.