浅谈大学生合作学习的意义及培养策略

我国大学生未充分利用合作学习的方法,缺少合作精神。可通过创建和谐校园环境和良好的家庭环境,改革以应试为主的教育体制,培养大学生合作学习的意识和社交技能大学生合作学习能力。     

传统学习行为与网络学习行为比较研究

网络媒体的发展使得网络学习行为的研究成为热点。把传统学习行为与网络学习行为进行对比,比较两者的优缺点,找出网络学习的规律和特点,更好地服务于网络教学,提升教学水平。     

关于生物类基础化学教学中应用“问题学习法”的探讨

本文通过课前、课堂、课后三个部分的问题设置,紧扣教学大纲,紧密联系中学化学和后续课程中相关知识,体现理论联系实际、学科前沿。引领学生"主动学习,积极思考",为后续课程学习起到积极的、有效的铺垫作用。     

基于可信多数投票的快速概念漂移检测

数据流因具有数据持续到达，概念漂移产生时刻无法预测、概念的数量不确定等特征，使得滑动窗口的大小很难事先确定，滑动窗口包含概念的数量对概念漂移检测存在影响.本文提出了基于可信多数投票的快速概念漂移检测算法（CMV_SEA），该算法使用SEA算法中的基分类器淘汰方法，使用可信多数投票实现滑动窗口中基分类器的集成.仿真实验表明：相比于SEA算法，CMV_SEA算法提高了泛化能力；能在新概念产生的第一时间内检测到概念漂移；对概念漂移的检测能力和新概念的学习能力不受滑动窗口大小的影响.     

境外网络游戏的软权力作用分析

境外网络游戏是软权力在文化领域的重要载体之一,正日益凸显其重要地位,大多是通过网络游戏的内容和背景展现出来,意在增加本国经济效益的同时,以达到能够吸引不同国家和地区的更多玩家,灌输和宣传本国的思想和文化,使之成为配合其各国软权力战略实施的双重作用。面对这种新的文化渗透模式,研究如何应对境外网络游戏的隐性影响,是目前研究的主要课题。     

Connecting market orientation,learning orientation and corporate social responsibility implementation: is innovativeness a mediator?

Corporate social responsibility (CSR) has been a topic of interest to both practitioners and researchers in the forest products sector. However, the existing literature falls short of examining the connections between CSR implementation and firm cultures, a key link to further our understanding for CSR implementation. This current study investigates the relationship between firm cultures and CSR implementation in the global forest, paper & packaging industry companies. Specifically, the authors propose firm cultures, including market orientation, learning orientation and innovativeness potentially support CSR implementation. Also, innovativeness is proposed to mediate the market orientation-CSR and learning orientation-CSR relationships. Data are collected through a mail survey with responses from 58 companies (87 individuals) of the Top 100 global forest, paper & packaging industry companies, identified by PricewaterhouseCoopers in its 2008 Global Forest, Paper & Packaging Industry Survey. Results confirm the hypothesized relationships between market orientation and CSR and learning orientation and CSR. However, the proposed mediating effect of innovativeness is not significant.     

论网页问卷调查在图书馆中的应用

在提出网页问卷调查应用原理的基础上,重点分析了图书馆中设计网页问卷调查应注意的问题,并指出网页问卷调查相比于传统问卷调查的优势所在,最后提出研究网页问卷调查在图书馆中的应用具有非常重要的方法论意义。     

CAI课件与CAI-I课件特点之比较分析

随着计算机技术和网络技术的发展,传统的计算机辅助教学（ＣＡＩ）手段与Ｉｎｔｅｒｎｅｔ技术的有机 结合,产生了ＣＡＩ的新形式—基于Ｉｎｔｅｒｎｅｔ的分布式ＣＡＩ,我国对此研究尚处于初级阶段。主要对 这种新形势下的ＣＡＩ－Ｉ课件与传统的ＣＡＩ课件的特点加以分析和比较,并简要介绍其实现方法。     

Learning performances of honeybees (Apis mellifera L) are differentially affected by imidacloprid according to the season

To establish the sublethal concentrations domain, acute and chronic oral tests were conducted on caged honeybee workers (Apis mellifera L) using imidacloprid and a metabolite, 5-OH-imidacloprid, under laboratory conditions. The latter showed a 48-h oral LD50 value (153 ng per bee) five times higher than that of imidacloprid (30 ng per bee). Chronic feeding tests indicated that the lowest observed effect concentrations (LOEC) of imidacloprid and of 5-OH-imidacloprid on mortality of winter bees were 24 and 120 microg kg(-1) respectively. Behavioural effects of imidacloprid and 5-OH-imidacloprid were studied using the olfactory conditioning of proboscis extension response at two periods of the year. Winter bees surviving chronic treatment with imidacloprid and 5-OH-imidacloprid had reduced learning performances. The LOEC of imidacloprid was lower in summer bees (12 microg kg(-1)) than in winter bees (48 microg kg(-1)), which points to a greater sensitivity of honeybees behaviour in summer bees, compared to winter bees.     

Stimulating effects of the insecticide chlorpyrifos on host searching and infestation efficacy of a parasitoid wasp

Hymenopterous parasitoids play an important role in the control of insect populations. During oviposition, Hymenopterous parasitoids use cues such as odours from their environment to locate their specific host. Leptopilina heterotoma (parasitoid of Drosophila larvae) locate their host by probing the substrate with the ovipositor. This behaviour can be induced by the odour of the host substrate alone. We analysed the sub-lethal effects of chlorpyrifos at LD20 on the probing activity in response to a fruit odour (banana). The insecticide increased the percentage of females spontaneously probing in response to the odour. Parasitoid females were then conditioned to associate banana odour with the oviposition in host larvae. This conditioning enables parasitoids to memorize the odour and to increase their probing response to this odour. During the olfactory conditioning, females exposed to the insecticide found and oviposited in host larvae more quickly than control females. One hour after the olfactory conditioning, females exposed to the insecticide presented a higher increase of their probing response to the odour than controls. Twenty-four hours after conditioning, the stimulation produced by chlorpyrifos was no longer perceptible, but the level of response of conditioned females was still higher than that of non-conditioned females, showing that odour memory was not impaired by the insecticide treatment. These sub-lethal effects, that stimulate host searching by parasitoids without impairing odour memorization, could increase their parasitic efficiency.