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.     

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.     

Joint rate control and scheduling for wireless uplink video streaming

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…     

基于IPSec与基于MPLS的VPN的比较与分析

介绍目前两种热门的VPN技术：IPSec—VPN和MPLS—VPN,分析和比较了这两种VPN技术在安全性、可扩展性、使用方便性和QoS支持等特点,给出了两种VPN技术各自适合的应用领域。     

教育过程视角下高校自考助学价值研究

教育过程为研究高校自考助学价值提供了一个新的角度。教育是对教育者进行教育的过程,高校自考助学作为教育的一种方式,注重的是助学教育的过程。高校自考助学具有教育的过程价值,其主要表现为自考助学过程中实现的制度价值、社会价值和教育交往价值。研究和探索自考助学的价值,对于在新形势下建设中国特色自考助学的终身学习体系具有重要的现实意义。     

Success in Geology --Give My Respects to Dad

朱筱敏——中国石油大学教授,荣获第十一次李四光地质科学奖。除去种种光环,朱教授在生活中也扮演着一个普通父亲的角色,来看看女儿眼中的朱教授是什么样子的。     

残差控制图在叶丝干燥出口含水率上的应用

为解决常规控制图在叶丝干燥出口含水率监控中大量虚发警报,造成控制图监控失效的问题,采用时间序列模型对叶丝干燥出口数据进行拟合分析,使用残差控制图对含水率进行监控,降低了控制图的误警报率,提高了控制图在出口含水率控制中的应用效果.     

高校扩招何以实施——基于“资源稀释模型”的解释

虽然高校扩招政策已经实施十余年,但学者们对其关注度依然不减。从现有文献资料来看,学者们关注更多的是高校扩招的背景以及扩招所带来的影响等,而对我国为何可以顺利实施高校扩招给予的关注却很少。笔者从资源稀释模型(Resource Dilution Model)的视角,探讨在我国为何得以顺利实施高校扩招这一具有深远影响的政策。     

学前教育专业“三学”受到的挑战与未来改革路径

三学是学前教育学、学前儿童心理学、学前儿童卫生学的简称,一直是学前教育专业课程体系的核心。然而,随着幼儿园教师教育的快速转型,学前教育专业培养幼儿园一线教师的目标更加明确,三学的传统核心地位受到挑战,急需变革。有必要将学前儿童心理学改为早期儿童发展科学,将学前教育学改为幼儿园教师的学前教育学,将学前儿童卫生学改为学前儿童保育学。改革的关键是思维方式的转换。