Academic+Reading+3

1、the module显然，帮助学生更好地了解温室气体，对地球温度的影响是紧迫的。在本文提供的 工作进行了一系列的活动在全球变暖：虚拟地球(GWVE)课程单元。目的是让学生 了解每个概念在温室效应中的作用，并了解它们是如何相互作用产生温室效应 的。这些活动还帮助学生了解温室效应和全球变暖之间的关系。我们通过分析学 生对模块中所涉及概念的一系列开放式问题的回答来测量学生的表现。Methods 方法Research design 研究设计3 The mai n research questi on is, u I low does students understa nding of the gre

2、enhouse effect and global warming change after participating in a technology-enhanced learning environment featuring virtual experiments with an interactive visualization2n This research is based on GWVE curriculum unit In the week-long unit during their science classes , students participate in an

3、eight-question , paper-and-penci1 assessment prior to and following participation in the unit, creating a matched sample comparison. A series of matched sample ttests3 are used to determine the degree of significance between pre- and post-test performance主要研究的问题是，学生如何理解参与技术强化学习环境特色和交互式可视化 虚拟实验后的温室效应

4、和全球变暖改变“这项研究是基于GWVE课程单元。在在 科学课上为期一周的单元，学生参与一个8个问题，纸笔评估之前和之后的参与 单元创建一个匹配样本的比较。通过一系列匹配的样本t检验来确定测试前和 测试后性能之间的显著性。Participants 参与者4 Five teachers from three schools on the west coast and two schools in the southeastern US enacted the curriculum unit in their sixth-grade science classes The teachers each

5、 had at least two years of experience using our curriculum units in their instruction. Each teacher received targeted professional development support (Varma et al. , 2008) The professional development activities included meetings to introduce the overall Web-based Inquiry Science Environment (WISE)

6、 and the GWVE unit. Teachers also received classroom support to help them incorporate the activities in their instruction (Varma et al. , 2008). One hundred and ninety sixth-grade students (98 males and 92 females) participated in the unit activities and the pre-/post-assessments美国西海岸三所学校的五名教师和美国东南部

7、的两所学校开设了六年级的课 程单元。每位教师在教学中都有至少两年的课程使用经验。每一位老师收到 了有针对性的专业发展支持(Varma et al,2008) o专业发展活动包括会议 介绍全面的基于网络的调查科学环境(WISE)和GWVE单元。教师还得到了教室 virtual vxriaent即通过计算机操作的实脸 visualization /?.可視化3 i-test t检羁也称Student t检验（Student 3 t-teM 主要用于样本含量较小总体你准差6未知的正态分有資料的支持，帮助他们在教学中融入活动(Varma et al,2008) 0 一百九十名六年 级学生(98名男性和

8、92名女性)参加了单元活动和前/后评估。Procedure 过程5 Studentsf participation began with their individual completion of an eight-question, paper-and-pencil pre-test Classroom teachers administered the pre-test during the students * normal class meetings. The questions, presented in Table 1, were primarily open-ended qu

9、estions about global warming, the gree nhouse effect, and the in dividual factors that contribute to these phenomena Following the pre-test , all students worked in pairs to complete the activities and embedded reflection notes in the GWVE unit学生们的参与开始于他们的个人完成一个8个问题，纸和笔的预测试。课堂上的 教师在学生正常的课堂上进行了预测试。这些

10、问题，如表1所示，主要是关于全 球变暖、温室效应以及导致这些现象的个别因素的开放性问题。在预考后，所有 学生都成对工作，完成了 GWVE单元的活动和嵌入式反思笔记。Table 1 Pre-/Post-test questions 表 1 预处理/测试后的问題1) Describe how the greenhouse effect happens Try to make sure thatyou use the following three terms： 1) solar energy, 2) infrared energyInfrared energy 红外強JSJfSE, and 3)

11、greenhouse gases2) What is global warming3) What is the differenee between the greenhouse effect and global warming4) Look at the list below and select all of the factors that youthink have an effect on global warmingAcid RainWater Vapor Greenhouse GasesClouds Carbon DioxideThe Ozone Layer Solar Ene

12、rgy Infrared Energy5) What is the role of albedoalbedo e.反盟率 in the greenhouse effect6) What is the role of clouds in the greenhouse effect7) What is the role of greenhouse gases in global warmingBe sure tobe as detailed as possible when you explain your answer You can draw a picture to help explain

13、 your thoughts8) . Picture A shows a real greenhouse where light from the sun passesthrough the glass panels and heats the in side The glass pan els of the greenhouse keep the heat energy from escaping. Picture B shows the greenhouse effect that happens on the Earth Which part of the picture is like

14、 the glass of the greenhouseCircle One. SUN SPACE ATMOSPHERE EARTH Explain your answer.1) 描述温室效应是如何发生的。试着确保你使用以下三个方面：1)太阳能、2) 红外能量，3)温室气体。)2) 。全球变暖是什么3) o什么是温室效应和全球变暖之间的区别吗请看下面的列表，选择所有你认为对全球变暖有影响的因素。 酸雨水蒸气一一温室气体云二氧化碳一一臭氧层 一一太阳能 一一红外能量5) 。在温室效应反照率的作用是什么6) o云在温室效应的作用是什么7) 。什么是全球变暖的温室气体的作用一定要尽可能详细解释你的答

15、案。你可以画一幅图来解释你的想法。图A是一个真实的温室，阳光透过玻璃面板，加热内部。温室的玻璃板使热 能不受热量的影响。图B显示了地球上发生的温室效应。哪一部分的图 片就像温室的玻璃圆。太阳太空大气地球解释你的答案。6 The unit in eludes six main activities In the first activity, students view short video clips as an intToduction to the global warming phenomenon and calculate their ecological footprint eco

16、logical foctprini生东.足遙，即久人对环境的总体彫响using an online ecological footprint calculator (Islandwood, 2010). In the second activity, students learn about the Earth s energy balance and observe the energy transformation depicted in the visualizations该单元包括六项主要活动。在第一个活动，学生查看录像短片介绍全球变暖的现 象，并计算其生态足迹使用在线生态足迹计算器(

17、Islandwood,2010) o在第二项活 动中，学生们了解地球的能量平衡，并观察在可视化中所描绘的能量转换。7 In the third activity , students conduct experiments with the visualization to learn about greenhouse gases, clouds and albedo. The fourth activity is a jigsawJigsaw n.切块耕接法 activity in which by conducting experiments half of the students le

18、arn about clouds and the other half learn about albedo. Teachers randomly assign student pairs to each topic Throughout these experimentation and reflection steps, embedded notes prompt students to generate hypotheses , gather evidence, draw conclusions and make connections between new and pre-exist

19、ing ideas At the end of the fourth activity, all students participate in an online discussion to share their knowledge as a completion of the jigsaw activity and learn about the factor that they did not investigate In the fifth activity, students use a more complex visualization to learn about how p

20、opulation levels impact greenhouse gas emissions and global warming This visualization allows students to manipulate the population growth rate and CO? emission. The results of their manipulation will show a numerical representation of the concentration of greenhouse gases in the atmosphere, the tem

21、perature of the Earth and the albedo leve1 Additionally, there is a graph representing the temperature fluctuations that occur as a result of students manipulations (Tinker, 2005) In the f in al activity, students create a family plan to reduce their greenhouse gas emissions and recalculate their ec

22、ological footprint based on their planned behavior changes在第三个活动，学生进行实验与可视化了解温室气体，云层和反照率。第四个活动 是一个拼图活动，通过实验，一半的学生学习了云，另一半学习了反照率。老师 随机分配学生对每个题目。在这些实验和反射的步骤，指出嵌入式提示学生生成 假设收集证据得出结论使新的和已有的思想之间的联系。第四个活动结束时. 所有学生参与网上讨论分享他们的知识完成拼图活动，了解他们没有调查的因 素。在第五个活动中，学生使用一个更复杂的可视化学习人口水平如何影响温室 气体的排放和全球变暖。这种可视化方法可以让学生控制人口

23、增长率和二氧化碳 排放o他们操纵的结果将显示的数值表示大气中温室气体的浓度，地球的温度和 反照率水平。此外,有一个图表示温度波动发生由于学生操作(修改,2005) o在最 后的活动学生创建一个家庭计划减少温室气体排放和重新计算生态足迹基于计 划行为变化。8 Students participated in the unit activities for five onehour class periods in one week The curriculum unit was enacted as a part of the teachers normal classroom instruct

24、ion. The teacher served as the lead instructor At least one researcher was present in the classrooms to observe the enactment and to assist with technology issues Following the unit activities, students individually completed a paper-and-penci1 post-test comprising the same questions included in the

25、 pre-test The pre-and post-test assessments lasted Approximately 20 minutes each学生在一周内参加五小时一班的单元活动。课程单元作为教师正常课堂教学的一 部分而制定。老师担任首席教师。至少有一名研究人员在场，以观察制定和协助 处理技术问题。在单元活动之后，学生们分别完成了考前测试中包含的相同问题 的纸笔测验。测试前后的评估持续大约20分钟。Data analysis数据分析9 The main data were generated from students responses to eight open-e nd

26、ed questions in eluded in the pre-and post-tests The first three questions assess stude nts understand in g of the target phenomena (the greenhouse effect and global warming ) at a systemic leve1Questions 1 and 2 ask students to describe the greenhouse effect and global warming. Question 3 asks them

27、 to describe the differenee between the two.主要数据来自学生对8个开放式问题的回答，这些问题包括在考试前和考试后。 前三个问题在系统性水平评估学生的理解目标现象(温室效应和全球变暖)。问题 1和2要求学生描述温室效应和全球变暖。问题3要求他们描述两者的区别。10 Questionassesses students alternative ideas about the factorsthat contribute to global warming It ineludes a checklist of eight factors that are p

28、ossible contributors Students were asked to Look at the list below and select all of the factors that you think have an effect on global warming ” Students received a score of one through six based on the number of correct selections. Questions 5, 6 and 7 ask students to explain how particular compo

29、nents (albedo, clouds, and greenhouse gases) are involved in the greenhouse effect The final question is a representation analysis prompt It asks students to analyze how an actual greenhouse represents the scientific phenomenon, the greenhouse effect问题4评估学生关于导致全球变暖的因素的其他观点。它包括八个因素的清单， 这些因素是可能的贡献者。学生

30、们被要求“看看下面的列表，选择你认为对全球 变暖有影响的所有因素”。学生们根据正确选择的数量，获得了 1到6分的分数。 问题5、6和7问学生解释特定组件(反射率、云层和温室气体)参与温室效应。 最后一个问题是一个表示分析提示。它要求学生分析一个实际的温室是如何代表 科学现象的，温室效应。11 Students responses to al 1 questions except Question 4 were coded using knowledge integrationkix)wl?dge Integration知识室成.即分做知识的有机览合 scoring rubricsrubric

31、n.指示：規则 (Table 2) Each response received a score of zero through five based on the correctness of the expressed ideas and 1 inks between the ideas Each rubric was created based on an analysis of the links present in a ful ly correct response to each question.学生应对所有的问题，除了问题4编码使用知识集成得分评估准则(表2)。每一 个反应都

32、是根据表达的想法的正确性和思想之间的联系，从0到5的分数。每个 标题都是基于对每个问题的完全正确回答的链接的分析而创建的。12 A group of researchers familiar with the curriculum unit design and the knowledge integration framework reviewed the rubrics and the example responses to ensure that the correct criteria would be applied to the data Twenty percent of th

33、e tests were coded by a second researcher for reliability (97%) Discrepant codes were resolved via discussions between the coders 一组熟悉课程单元设计和知识集成框架的研究人员回顾了题目和示例响应，以确 保将正确的标准应用于数据。百分之二十的测试是由第二名研究人员编写的，用 于可靠性(97%) o有差异的代码通过编码者之间的讨论得到解决。13 One of the pre- / post-test questions was, uDescribe how the gr

34、eenhouse effect happens Try to make sure that you use the following three terms： 1) solar energy, 2) infrared energy, and 3) greenhouse gases ” A complete , well-integrated response ineludes linked information about solar energy, infrared energy, greenhouse gases, and the Earth s temperature The fir

35、st three columns in Table 2 show the general sequence of scores and knowledge integration (KI) levels that are used to code students? responses to each of the open-ended pre- / post-test questions. This framework is used across all of the pre- / post-test questions except Questions 4. The fourth col

36、umn lists example Question 1 responses for each KI leve1前置/测试后的一个问题長，“描述温室效应是如何发生的。试着确保你使用以 下三个方面：1)太阳能.2)红外能量,3)温室气体。” 一个完整的.完整的反应 包括联系信息太阳能、红外能量，温室气体,地球的温度。前三列在表2中显示 分数和知识集成的一般序列(KI)水平用于代码学生应对每一个开放式的前/后 测试问题。除了问题4之外，该框架适用于所有的前/后测试问题。第四列列出 了每个KI级别的示例问題1。Table 2 Example KI rubrics and example studen

37、t responses to Question 1 Describe how the greenhouse effect happens.表 2 例子 KI 评估准则和 学生回答问题1 “描述温室效应長如何发生的。”Score 分数KI levelKI水平Description 描述Example student response 例如学生的反应0No answer 无应答/1Irreleva nt 不相干的Students write some text, but do not answer the question.学生写一 些文本，但不回答问题。I don t know what a g

38、reenhouse is.我不知道温室是什么。2Incorrect错误的Responseisscientifically incorrect.反应是科学 上的错误。The greenhouse gases come out from the greenhouse and into the atmosphere, which creates the greenhouse effect.温室气体从 温室气体排放到大气中，产生温室 效应。3Partial link 部分联系Students have relevant and correct ideas, but do not fully elabo

39、rate the link between the two in aThe greenhouse gases keep theInf rared radiati on (IR) in温 室气体使红外辐射(IR)ogiven context.学生有 相关和正确的想法，但 并不完全详尽的一分之 二给定的上下文之间的 联系。4Full link 完全联系Students elaborate a scientifically valid link between the two ideas relevant to a given context.学生们 详细阐述了与特定上下 文相关的两个概念之间 的科

40、学有效联系。Too much C02 builds up, making the infrared energy bounce back down to the Earth and so thetemperature gets higher 太多的 二氧化碳积聚，使得红外能量反弹 到地球的温度会更高5Complex link 复杂的联 系Students elaborate three or more scientifically valid links among ideas relevant to a given context学生在与给定的上下文 相关的思想中精心设计 三个或更科学有效的

41、链Sunlight heats the Earth , causing it to release IR energy, which then boun ces off a greenhouse gas such as C02 back toward the Earth This warms the overall temperature.阳光加热了 地球，导致红外能量释放，然后反 射一种温室气体如二氧化碳回到 地球。这会使整个温度升高。Thy to make sure that you use the following three terms： 1) solar energy, 2) in

42、frared energy, and3) greenhouse gases.你确保你使用以下三个方面：1)太阳能、2)红外能量,3)温室气体。14 Matched t-test analyses were conducted to measure differences in students understanding prior to and following their participation in the unit activities For each t-test, Cohes d was calculated to report the effect sizes (Cohe

43、n, 1992) These data help show how participating in the interactive unit activities changed students1 understanding of the greenhouse effect and global warming通过配对的t检验分析来衡量学生在参与单元活动之前和之后的理解上的差 异。对于每一个学习任务，科恩的d计算报告的影响大小(科恩,1992) 0这些数据 有助于说明参与互动单元活动如何改变学生对温室效应和全球变暖的认识。Results15 Following participati on

44、 in the GWVE unit activities, stude nt s ideas were more normative and better integrated Scores from each question were summed to calculate an overall learnin呂 score, Mean overall learning scores improved from pre- to post-participation(t (189) =, /X.001).参与GWVE单元活动后，学生的想法是更规范更好的整合。分数从每个问题总结 计算整体学习成

45、绩，意味着从测试前到参与整体学习成绩提高(t(189)= ,p .001)o16 Responses to individual pre- / post-test questions were analyzed using matched t - tests for a more detailed examination of changes in students understanding See Table 3 for a summary of the analyses. Students performanee on the post-test showed improved unde

46、rstanding of the greenhouse effect (t (189)=, /K.001)对个别前/后测试问题的反应用配对的t检验分析，以更详细地检验学生理解的 变化。分析的摘要见表3。学生在测试后显示改善温室效应的理解(t(189)= ,p .001)0Table 3 pre-/Post-test performance analyses 表 3 预/后测试性能分析Pre-test mean (SD) 预测试均值 (SD)%Post-test Mean (SD) 测试后均 值(SD)DifferenceMean(SD) 差分均值(SD)Effec t size (d) 影响

47、尺寸(d)!pItem 1Greenhouse effect温室效应0()86 ().63.001Item 2Global warming 全球变暖(.97)(.97)53 ().50.001Item 3Difference 差异()()().69.001Item 4 Alternative ideas 其他的想法()().79 ().47.001Item 5Albedo反照率.74 (.76)().90 ().62.001Item 6Clouds 云()().97 ().66.001Item 7Greenhouse gases 温室气 体()()81 ()55001Item 8 Atmosp

48、here 大气()().27 ().19.001Total KI score0 001KI总分()17 Prior to instruction , students had some understanding of the greenhouse effect, but it was generally incomplete or incorrect For example, one student wrote, u I think the greenhouse effect happens when solar energy is trapped in the stratosphere10

49、, n and another wrote, “ The solar energy gets stronger and the infrared energy goes away. ” Several responded with I don t knowOn the post-test, students* responses ineluded more ideas about the interaction of the key factors They also had more links between their ideas, indicating that their under

50、standing was more integrated教学前学生有一些对温室效应的理解，但一般都不完整或不正确的。例如，一个 学生写道：“我认为温室效应发生在太阳能是困在平流层另一个写道：“太阳 能越来越强大和红外能量消失。几个人回答说：“我不知道。在测试后，学生 的回答包括了更多关于关键因素相互作用的观点。他们的想法之间也有更多的联 系，这表明他们的理解更加完整。18 Students responded to uWhat is global warming on the pre-test with incomplete ideas from popular media Some exam

51、ple responses are, It s when the sun s so hotf it makes the North Pole and South Pole melt and floods the world. ” And u It s when the Ozone layer gets th inner. After participating in the module , more students provided more responses focusing on the relationship between the greenhouse gas levels a

52、nd the Earth s temperature Their responses indicate more normative scientific knowledge ( first example) and more integrated ideas (second example) (t (189)=, /X.001).学生对“全球变暖是什么”从大众媒体预先测试不完整的想法。一些示例响 应：“当太阳太热了 这让北极和南极融化和洪水。和“当臭氧层变薄的时候” O“参与模块之后，更多的学生提供了更多的反应之间的关系关注的温室气体，地 球的温度水平。他们的反应表明更加规范科学知识(第一个

53、例子)和集成思想(第 二个例子)(t(189)= ,p . 001) o19 On the pre-test, two commonly expressed responses to the question about the difference between the greenhouse effect and global warming were, “ They are the same thing. ” and “ The greenhouse effect causes global warming. ” On the post-test , students showed th

54、at they understood that these two were different phenomena, and they were able to generate integrated explanations describing the difference(t (189) = , /K. 001).在检测前，一般两个表示反应的问题对温室效应和全球变暖之间的区别，”他们 是一样的。和“温室效应导致全球变暖o ”测试后，学生们表明他们明白，这两 个是不同的现象他们能够生成综合解释描述的差异(t(189)= . 001)20 Three questions asked stu

55、dents to explain the roles of individual contributing factors (albedo, clouds, and greenhouse gases ) in the greenhouse effect During instruction, students conducted virtual experiments to learn about each of these factors using the greenhouse visualization. Findings show that studentsy understandin

56、g of each of the factors improved fol lowing their participation in the curriculum unit. Table 4 1ists examples of students responses to each of these prompts on the pre- and post-test assessments. Combined, these data show that students improves their knowledge of individual concepts and their unde

57、rstanding of the greenhouse effect and global warming phenomenon.三个问题要求学生解释个人因素(反照率、云层和温室气体)在温室效应中的作 用。在教学过程中，学生进行虚拟实验，以了解这些因素，利用温室的可视化。 调查结果显示，学生在参与课程单元后，对各项因素的了解均有所提高。表4 列出了学生对每次考试前和测试后评估中的每一个提示的反应。结合这些数据表 明，学生提髙了对个人概念的了解和对温室效应和全球变暖现象的理解。 Discussion 讨论21 Overal 1, students show an increased understanding of the target phenomena, but there is room for growth For example, in order to develop a deeper understanding of the greenhouse effect and global warming, students have to learn about the two main relationships among the individual components highlighted in the unit： 1) higher