科创中国

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

非常感谢《声学技术》编辑领导们邀请香港声学学会代表-何德健先生、姚景光先生、麦卓明博士及粱志坚博士出席这次庆祝大会.

马大猷:国际著名声学家辞世7月17日,我国现代声学的重要开创者和奠基人、中国科学院资深院士、美国声学学会荣誉会士马大猷教授逝世,享年97岁.马长期从事声学研究工作,他提出的简正波理论,是当代建筑声学发展的里程碑;

通过分析4个典型寺院中录制的钟声等声音和发放的调查问卷,对汉传佛教寺院钟声景观进行了探讨.声音分析包括钟声的物理声学参数和心理声学参数,问卷研究揭示了钟声受到大多数人喜欢的原因,以及被调查者社会因素对钟声评价的影响.成果将对佛教寺院声景观的全面研究提供有益的探索.

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.

目的:旨在探讨子宫输卵管声学造影对不孕症患者输卵管通畅性及宫腔疾病的诊断价值.方法:对医院近6a来85例不孕症患者进行子宫输卵管声学造影,评价输卵管通畅性及宫腔情况,并与腹腔镜或手术、宫腔镜对照.结果:输卵管声学造影显示双侧输卵管阻塞及宫腔病变与腹腔镜或手术、宫腔镜符合率为100%,双侧输卵管欠通畅及一侧欠通畅一侧阻塞的符合率分别为83.3%和92.6%.结论:子宫输卵管声学造影具有无创性、风险小、适用范围广等优点,可作为不孕症评价盆腔的首选方法.

观察并量化鱼类面对诸如拖网等主动式采样器具时的行为是一个挑战.应用一种高频成像声纳(DIDSON)在中等到富营养的水库直接观察并记录了鱼类在一张主动式中上层拖网网口前的躲避行为.在这个多鱼种水库环境中鱼类表现出了多样的行为模式.声学分析显示,在拖网区域内鱼类有76%被捕获,有24%则游出了该区域.

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.