Technology-Enhanced Formative Assessment: A Research-Based Pedagogy for Teaching Science with Classroom Response Technology   总被引：3，自引：3，他引：0  

Ian D. Beatty  William J. Gerace 《Journal of Science Education and Technology》2009,18(2):146-162

Classroom response systems (CRSs) are a promising instructional technology, but most literature on CRS use fails to distinguish between technology and pedagogy, to define and justify a pedagogical perspective, or to discriminate between pedagogies. Technology-enhanced formative assessment (TEFA) is our pedagogy for CRS-based science instruction, informed by experience and by several traditions of educational research. In TEFA, four principles enjoin the practice of question-driven instruction, dialogical discourse, formative assessment, and meta-level communication. These are enacted via the question cycle, an iterative pattern of CRS-based questioning that can serve multiple instructional needs. TEFA should improve CRS use and help teachers “bridge the gap” between educational research findings and practical, flexible classroom strategies for science instruction.

Ian D. BeattyEmail:

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Proteome changes in the plasma of Papilio xuthus (Lepidoptera:Papilionidae): effect of parasitization by the endoparasitic wasp Pteromalus puparum (Hymenoptera: Pteromalidae)     

Jia-ying ZHU  Gong-yin YE  Qi FANG  Cui HU 《Journal of Zhejiang University. Science. B》2009,10(6)

Although the biochemical dissection of parasitoid-host interactions is becoming well characterized, the molecular knowledge concerning them is minimal. In order to understand the molecular bases of the host immune response to parasitoid attack, we explored the response of Papilio xuthus parasitized by the endoparasitic wasp Pteromalus puparum using proteomic approach. By examining the differential expression of plasma proteins in the parasitized and unparasitized host pupae by two-dimensional (2D) electrophoresis, 16 proteins were found to vary in relation to parasitization compared with unparasitized control samples. All of them were submitted to identification by mass spectrometry coupled with a database search. The modulated proteins were found to fall into the following functional groups: humoral or cellular immunity, detoxification, energy metabolism,and others. This study contributes insights into the molecular mechanism of the relationships between parasitoids and their host insects.  相似文献   

Different responses of two Mosla species to potassium limitation in relation to acid rain deposition     

Meng Wang  Bao-jing Gu  Ying Ge  Zhen Liu  De-an Jiang  Scott X. Chang  Jie Chang 《Journal of Zhejiang University. Science. B》2009,10(8):563-571

The increasingly serious problem of acid rain is leading to increased potassium (K) loss from soils, and in our field investigation, we found that even congenerically relative Mosla species show different tolerance to K-deficiency. A hydroponic study was conducted on the growth of two Mosla species and their morphological, physiological and stoichiometric traits in response to limited (0.35 mmol K/L), normal (3.25 mmol K/L) and excessive (6.50 mmol K/L) K concentrations. Mosla hangchowensis is an endangered plant, whereas Mosla dianthera a widespread weed. In the case of M. hangchowensis, in comparison with normal K concentration, K-limitation induced a significant reduction in net photosynthetic rate (P _n), soluble protein content, and superoxide dismutase (SOD) activity, but an increase in malondialdehyde (MDA) concentration. However, leaf mass ratio (LMR) and root mass ratio (RMR) were changed little by K-limitation. In contrast, for M. dianthera, K-limitation had little effect on P _n, soluble protein content, SOD activity, and MDA concentration, but increased LMR and RMR. Critical values of N (nitrogen): K and K:P (phosphorus) ratios in the shoots indicated that limitation in acquiring K occurred under K-limited conditions for M. hangchowensis but not for M. dianthera. We found that low K content in natural habitats was a restrictive factor in the growth and distribution of M. hangchowensis, and soil K-deficiency caused by acid rain worsened the situation of M. hangchowensis, while M. dianthera could well acclimate to the increasing K-deficiency. We suggest that controlling the acid rain and applying K fertilizers may be an effective way to rescue the endangered M. hangchowensis. Project supported by the National Natural Science Foundation of China (No. 30570113) and the Research Fund for the Doctoral Program of Higher Education (No. 20060335008), China  相似文献   

信号分子Ca^2＋在植物逆境应答中的作用     

王文静  高志英 《商丘职业技术学院学报》2009,8(2):108-110

钙信号系统参与了植物对非生物胁迫的应答已经被证实,研究表明,逆境下植物产生的钙信号有助于激发植物产生适应逆境的反应,钙信号系统可通过调控基因表达而提高植物的逆境适应性．  相似文献   

Response of harmonically and stochastically excited strongly nonlinear oscillators with delayed feedback bang-bang control     

Chang-shui Feng  Wei-qiu Zhu 《浙江大学学报(A卷英文版)》2009,10(1):54-61

We studied the response of harmonically and stochastically excited strongly nonlinear oscillators with delayed feedback bang-bang control using the stochastic averaging method. First, the time-delayed feedback bang-bang control force is expressed approximately in terms of the system state variables without time delay. Then the averaged It6 stochastic differential equations for the system are derived using the stochastic averaging method. Finally, the response of the system is obtained by solving the Fokker-Plank-Kolmogorov （FPK） equation associated with the averaged lt6 equations. A Duffing oscillator with time-delayed feedback bang-bang control under combined harmonic and white noise excitations is taken as an example to illus- trate the proposed method. The analytical results are confirmed by digital simulation. We found that the time delay in feedback bang-bang control will deteriorate the control effectiveness and cause bifurcation of stochastic jump of Duffing oscillator.  相似文献   

感知产品创新对冲动购买的作用机制研究          下载免费PDF全文

常亚平  朱东红  李荣华 《科研管理》2012,33(3):18-26,35

产品创新是否被消费者以冲动购买的方式接受是企业和学术界关心的重要议题。本研究以手机制造业为例,从技术创新的角度,采用多元统计的方法构建了消费者感知的产品创新与冲动购买意愿的关系模型,并引入了情感反应作为中介变量。研究结果表明:外观创新、操作创新与冲动购买意愿之间存在积极的正向关系;功能创新与冲动购买意愿之间存在负向关系;快乐情感在产品创新与冲动购买意愿之间起到显著中介作用,而唤起情感在二者关系中的中介效应不显著。  相似文献   

模拟3500m不同低氧训练模式对大鼠力竭运动后心肌线粒体自由基代谢及呼吸链功能的影响     

李洁  邢良美 《上海体育学院学报》2012,(1):51-55

目的:探讨4种低氧训练模式对大鼠力竭运动后心肌线粒体自由基代谢及呼吸链功能的影响。方法:将雄性Wistar大鼠随机均分为5组,即低住低训组(LoLo)、高住高练组(HiHi)、高住低训组(HiLo)、低住高练组(LoHi)及高住高练低训组(HiHiLo)。以当地环境为基点作为常氧环境,采用低压氧舱模拟低氧环境。依实验方案,各组大鼠分别在常氧或/和低氧环境中居住及递增负荷训练5周,每周训练6 d。各组大鼠在最后1次训练后,在常氧环境中恢复3 d,力竭运动后即刻取心肌样本。用差速离心法提取心肌线粒体,分别测定丙二醛含量、超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶(catalase,CAT)活性及呼吸链酶复合体I～IV(CI～IV)活性。结果:与LoLo组相比,心肌组织中HiHi组GSH-Px及CAT活性均显著升高,HiLo组CAT活性显著升高,LoHi和HiHiLo组SOD、GSH-Px及CAT活性均显著升高,4种低氧训练模式MDA含量均显著降低。与LoLo组相比,HiHiLo组心肌线粒体SOD活性显著升高,HiHi、HiLo和HiHiLo组MDA含量均显著降低。与LoLo组相比,HiHi组心肌线粒体CIV活性显著升高,HiHiLo组CI、CII和CIV活性均显著提高,HiHi、LoHi及HiHiLo组CIII活性均显著降低。结论:HiHiLo可能是较好的低氧训练模式。  相似文献   

中国对美高技术产品出口研究——基于PCT申请数据的分析     

孙莹  陈一波  沈婷 《情报杂志》2012,31(7):205-207,152

首先对高技术产品的界定做了解释,再以2001-2010年中国对美高技术产品出口和PCT国际专利申请的总数据为样本建立VAR模型,对出口额与PCT国际专利申请量的相关性进行了计量分析,发现出口贸易对PCT国际专利申请有长期显著的拉动作用,中国PCT国际专利申请与出口的相关性具有单方向和长期效应的特点.最后依据之前的分析结果,对改善中国对美高技术产品出口和PCT国际专利申请做出了政策方面的建议.  相似文献   

中国碳排放强度预测与煤炭能源比重检验分析     

刘广为  赵涛  米国芳 《资源科学》2012,34(4):677-687

本文首先对国内外碳排放强度影响因素研究动态进行系统论述,随后对碳排放强度的预测研究现状做出整体概述。将DDEPM与现有的碳排放预测方法进行比较,说明其优越性。应用DDEPM,用Matlab编程,基于1980年-2009年的碳排放数据和GDP数据,对2020年碳排放和GDP进行预测,通过计算得出降低中国碳排放强度的潜力巨大。基于中国能源以煤炭为主的现状,应用向量自回归模型（VAR）,从煤炭能源消耗比重的角度,分析其对中国碳排放强度的影响。随后整合碳排放强度、煤炭消耗比重的预测数据和实际数据,将其整合数据进行向量自回归处理,其结果与碳排放强度与煤炭消耗比重实际数据的向量自回归进行比较,得出了两组模型结论的一致性,从变化规律的角度检验DDEPM预测的准确度;最后应用脉冲响应函数,分析碳排放相度与煤炭消耗比重的相关性。  相似文献   

我国房地产业影响因素实证研究     

熊巍  田勇 《科技创业月刊》2012,(7):55-58

分析了我国国民经济水平、城市化水平、居民收入水平以及国家产业结构调整情况对我国房地产业的影响程度,结果显示这几个因素对我国房地产的发展都存在影响,影响程度由大到小依次为城市化水平、国家经济发展水平、国家产业结构变动、居民收入水平。  相似文献