科创中国

作品设计思路 在初中物理教材中,气体压强与流速关系这一知识点的内容较为抽象,学生学习起来较为困难.学校实验室也没有演示气体压强与流速关系的器材.为了使学生在"兴中启""趣中探",实现在兴趣中寻找、理解规律,我便产生了自制一个整体美观、实验效果明显、实验现象非常有趣的演示器材的想法.

在学习铁的化合物时有一个实验是检验Fe^2+,学生设计了如下实验:在盛有新制FeSO4稀溶液的试管中滴入2滴KSCN溶液,观察现象,然后再滴入几滴浓HNO,,溶液的颜色变红.本来实验到这里就很成功了.但是有一部分学生实验时将红色溶液放置一会儿则发现溶液由红色快速变为蓝色,并产生红棕色气体.这一异常现象激起了学生的好奇心与求知欲望.针对此现象,我引导学生设计了探究性实验.

发明背景和创作原因 静电计是学习研究各种静电现象必不可少的实验工具.目前,学校实验室虽已配备多种示教静电计,但它们的结构模式都很陈旧,工艺及材料选用均较差,

转换法是初中物理研究的常用科学方法之一.某些物理现象或物理量无法直接观察或测量,这时可以利用它们与另外一些能够直接观察和测量的物理现象或物理量之间的内在联系,通过设计实验来间接推断和测量,这种方法叫做转换法.在"探究电流热效应"实验中,要探究Q与I、R、t的关系,其难点在于当我们使用控制变量方法进行探究时,如何比较两电阻产生的热量多少?对初中学生而言,知识储备不够,不能准确测出电阻放出的热量多少,要完成探究,就只能把比较"热量"多少转换成比较与热量有关的其它可观察的现象或物理量,从而对热量做出近似比较,完成探究过程.在课堂教学过程中,我们可采用多种转换法来完成对电阻放出

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

文章以实验为主要内容的,应说明实验设备、实验条件,对实验误差的估计等.文章的撰写应便于同行重复再现所报道的内容,由于保密原因不便公开某些内容的,应在附信中向编辑说明情况.

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?

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.