科创中国

近年来,中考物理命题加强了与科技、社会的联系,注重考查学生自然现象和生活中的物理学知识,充分体现"从生活走向物理,从物理走向社会"的新课程理念.认真分析近年中考物理试题,不难发现物理应用题、图像题、阅读理解题、物理评价题等一些新题型频繁出现在试卷中.面对中考试题出现的新变化,如何让学生在有限时间内抓住解题关键,达到事半功倍的效果?结合多年教学经验,我认为,要解答好新题型,最重要的是要认真读题,找准题中有用信息,运用所学知识正确解答.例1如图1是气体酒精浓度测试仪原理图,用于现场测试司机是否酒后驾车.其中电源电压保持不变,R为定值电阻,R'为二氧化锡半导体型酒精气体传感器,其阻值随气体酒精浓度的增大渐减小.若某次测试中电流表示数较大,则说明

文化的传播需要一定的载体.体育传播是以竞技比赛、体育活动、娱乐休闲等为载体的交流和信息交换行为.我国古代体育文化总是附着于军事、竞技游戏以及养生健身、侠义精神以及宗教仪式等特定的社会现象中继承和传播的.

Fear?and?anxiety?may?be?adaptive?responses?to?life-threatening?situations,?and?animals?may?communicate?fear?to?others?vocally.?A?fundamental?understanding?of?fear?inducing?sounds?is?important?for?both?wildlife?conservation?and?management?because?it?helps?us?understand?how?to?design?repellents?and?also?how?(and?why)?animals?may?be?negatively?impacted?by?anthropogenic?sounds.?Nonlinear?phenomena--sounds?produced?by?the?desynchronization?of?vibrations?in?a?sound?production?system-are?commonly?found?in?stress-induced?animal?vocalizations,?such?as?in?alarm?calls,?mobbing?calls,?and?fear?screams.?There?are?several?functional?hypotheses?for?these?nonlinear?phenomena.?One?specific?hypothesis?is?the?unpredictability?hypothesis,?which?suggests?that?because?nonlinear?phenomena?are?more?variable?and?somewhat?unpredictable,?animals?are?less?likely?to?habituate?to?them.?Animals?should,?therefore,?have?a?prolonged?response?to?sounds?with?nonlinear?phenomena?than?sounds?without?them.?Most?of?the?studies?involving?nonlinear?phenomena?have?used?mammalian?subjects?and?conspecific?stimuli.?Our?study?fo-?cused?on?white-crowned?sparrows?(Zonotrichia?leucophrys?ssp.?oriantha)?and?used?synthesized?acoustic?stimuli?to?investigate?behavioral?responses?to?stimuli?with?and?without?nonlinear?phenomena.?We?predicted?that?birds?would?be?less?relaxed?after?hearing?a?stimulus?with?a?nonlinear?component.?We?calculated?the?difference?from?baseline?of?proportion?of?time?spent?in?relaxed?behaviors?and?performed?pair-wise?comparisons?between?a?pure?tone?control?stimulus?and?each?of?three?experimental?stimuli,?including?a?frequency?jump?up,?a?frequency?jump?down,?and?white?noise.?These?comparisons?showed?that?in?the?30q50?s?after?the?playback?experiment,?birds?were?significantly?less?relaxed?after?hearing?noise?or?an?abrupt?frequency?jump?down?an?octave?but?not?an?abrupt?frequency?jump?up?an?octave?or?a?pure?tone.?Nonlinear?phenomena,?therefore,?may?be?generally?arousing?to?animals?and?may?explain?why?these?acoustic?properties?are?commonly?fou

喜欢大自然的人总是希望能够沐浴在自然光线里,而传统的人工灯光总是差强人意."Sunn Light"绝对是热爱自然者的福音. Sunn Light可以模拟太阳光,打开它就好像拥有一个自己的太阳,它可以模仿早晨初升的朝阳温柔地唤醒熟睡的用户,可以模拟晚上野外温暖的篝火让用户身心放松的入睡,也可以模仿太阳被乌云遮住后透出阳光.

《体验大自然》丛书(全14册),[德]安科·库铂、[德]阿诺·科尔布、[德]芭尔贝尔·奥弗特林等著,荆妮、郑高风译,王宏审译,科学普及出版社.2011年出版,定价:19.80(每册).

如今,报知春节迫近的已经不再是腊八粥的香味,而是媒体上充满压力的热火朝天的春运了.每入腊月,春运有如飓风来临,很快就势头变猛,愈演愈烈;及至腊月底那几天,春运可谓排山倒海,不可阻遏.每每此时我都会想,世界上哪个国家有这种一年一度上亿人风风火火赶着回家过年的景象?

我爱花园,源自父亲的熏陶及影响.父亲爱花,爱植物,爱生机勃勃的大自然.父亲应该有个花园,但始终没有.

设计以满足人们的需求,提高人们的生活品质,追求人与自然的和谐为目的.设计应由自然物质和自然元素引导,把握人的真实情感,追求人最初的、质朴的、真实的愿望和行为.师法自然的设计理念及方法能将生活上升为一种新的品质价值.这种创意设计对帮助人们热爱生活、品味生活、和谐文明具有一定的价值和意义.

二语词汇习得中的石化现象直接阻碍了学习者的语言表达及运用能力.二语习得者如果过分地依赖于高频词汇,结果则是其产出性词汇无论在广度还是深度上都很难进一步提高.因此,教师应该鼓励并在教学中采用一定的教学策略促使学生尽量多运用刚学的新词,而非一味依赖以往熟知的高频词汇,使学生的语言表达更加准确、恰当和丰富,从而促进其英语水平的不断提高.