中国著名流体力学专家周恒逝世|色噜噜狠狠狠综合曰曰曰
中新社天津8月1日电 (记者 孙玲玲)记者从天津大学获悉,中国著名流体力学专家、教育家、中国科学院院士、天津大学机械学院名誉院长周恒,因病医治无效,于8月1日在天津逝世,享年96岁。
周恒长期致力于流体力学、应用数学等领域的研究与教学工作,在流体力学稳定性理论、湍流研究等领域取得了一系列开创性成果,为中国力学学科的发展作出了卓越贡献。
周恒提出当时流行的流动稳定性弱非线性理论的实质性缺陷,研究出改进办法,提出了槽道流及边界层转捩过程的关键物理机制,在流动稳定性的理论研究上作出了重要贡献。他面向国家需求,致力于解决实际工程难题,聚焦临近空间高超声速飞行器,提出准确预测边界层转捩的改进方法,在高速飞行器空气动力学领域取得突破性研究成果。(完)
###yachisongdongyoushenmebanfahuifu?yachisongdongshiyigechangjiandewenti,youqizaiertonghelaonianrenzhonggengweipubian。songdongdeyachikenengyouduozhongyuanyinyinqi,baokuoyazhoubing、waishang、yaohebuzhenghuoguzhishusongdeng。ruobujishichuli,songdongdeyachikenengdaozhituoluo,yincijishicaiqucuoshixiandeyouweizhongyao。shouxian,weihukouqiangweishengshiyufangyachisongdongdejichu。dingqishuaya、shiyongyaxianyijishukoushui,keyiyouxiaojianshaokouqiangneidexijunzisheng,bimianyazhoubingdefasheng。jianyimeirizhishaoshuayaliangci,shiyonghanfuyagao,bingdingqijinxingyakejianzha,yibianjizaofaxianwenti。qici,ruoyachiyijingchuxiansongdong,jishizixunyayishifeichangbiyaode。yayihuigenjuqingkuangjinxingzhuanyepinggu。duiyuyinyazhoubingyinqidesongdong,yayikenenghuijinxingshencengqingjie,quchuyashihexijun,bangzhuhuifuyachidewengu。zaimouxieqingkuangxia,kenenghaixuyaojinxingshoushuzhiliao,yizhongjianyayinhegugejiegou。ciwai,baochilianghaodeyinshixiguanyefeichangzhongyao。yixiefuhangaiheweishengsuDdeshiwu,liruniunai、jianguohelvyeshucai,nengzengqiangyachihegugedejiankang。ruguoyouyaohebuzhengdewenti,shiyongyataohuojiaozhengqidezhiliaofangan,keyiyouxiaogaishanyachidewendingxing,jianshaosongdongdefengxian。zuihou,bimianbuliangxiguan,biruyongyachikaipinggaihuoyaoyingwu,nenggouyouxiaojianshaoyachishoushangdejilv。baochilianghaodeshenghuoxiguan,birujieyanhekongzhiyinjiu,yeyouzhu#(#)#(#)#(#)牙(ya)齿(chi)松(song)动(dong)有(you)什(shen)么(me)办(ban)法(fa)恢(hui)复(fu)?(?)牙(ya)齿(chi)松(song)动(dong)是(shi)一(yi)个(ge)常(chang)见(jian)的(de)问(wen)题(ti),(,)尤(you)其(qi)在(zai)儿(er)童(tong)和(he)老(lao)年(nian)人(ren)中(zhong)更(geng)为(wei)普(pu)遍(bian)。(。)松(song)动(dong)的(de)牙(ya)齿(chi)可(ke)能(neng)由(you)多(duo)种(zhong)原(yuan)因(yin)引(yin)起(qi),(,)包(bao)括(kuo)牙(ya)周(zhou)病(bing)、(、)外(wai)伤(shang)、(、)咬(yao)合(he)不(bu)正(zheng)或(huo)骨(gu)质(zhi)疏(shu)松(song)等(deng)。(。)若(ruo)不(bu)及(ji)时(shi)处(chu)理(li),(,)松(song)动(dong)的(de)牙(ya)齿(chi)可(ke)能(neng)导(dao)致(zhi)脱(tuo)落(luo),(,)因(yin)此(ci)及(ji)时(shi)采(cai)取(qu)措(cuo)施(shi)显(xian)得(de)尤(you)为(wei)重(zhong)要(yao)。(。)首(shou)先(xian),(,)维(wei)护(hu)口(kou)腔(qiang)卫(wei)生(sheng)是(shi)预(yu)防(fang)牙(ya)齿(chi)松(song)动(dong)的(de)基(ji)础(chu)。(。)定(ding)期(qi)刷(shua)牙(ya)、(、)使(shi)用(yong)牙(ya)线(xian)以(yi)及(ji)漱(shu)口(kou)水(shui),(,)可(ke)以(yi)有(you)效(xiao)减(jian)少(shao)口(kou)腔(qiang)内(nei)的(de)细(xi)菌(jun)滋(zi)生(sheng),(,)避(bi)免(mian)牙(ya)周(zhou)病(bing)的(de)发(fa)生(sheng)。(。)建(jian)议(yi)每(mei)日(ri)至(zhi)少(shao)刷(shua)牙(ya)两(liang)次(ci),(,)使(shi)用(yong)含(han)氟(fu)牙(ya)膏(gao),(,)并(bing)定(ding)期(qi)进(jin)行(xing)牙(ya)科(ke)检(jian)查(zha),(,)以(yi)便(bian)及(ji)早(zao)发(fa)现(xian)问(wen)题(ti)。(。)其(qi)次(ci),(,)若(ruo)牙(ya)齿(chi)已(yi)经(jing)出(chu)现(xian)松(song)动(dong),(,)及(ji)时(shi)咨(zi)询(xun)牙(ya)医(yi)是(shi)非(fei)常(chang)必(bi)要(yao)的(de)。(。)牙(ya)医(yi)会(hui)根(gen)据(ju)情(qing)况(kuang)进(jin)行(xing)专(zhuan)业(ye)评(ping)估(gu)。(。)对(dui)于(yu)因(yin)牙(ya)周(zhou)病(bing)引(yin)起(qi)的(de)松(song)动(dong),(,)牙(ya)医(yi)可(ke)能(neng)会(hui)进(jin)行(xing)深(shen)层(ceng)清(qing)洁(jie),(,)去(qu)除(chu)牙(ya)石(shi)和(he)细(xi)菌(jun),(,)帮(bang)助(zhu)恢(hui)复(fu)牙(ya)齿(chi)的(de)稳(wen)固(gu)。(。)在(zai)某(mou)些(xie)情(qing)况(kuang)下(xia),(,)可(ke)能(neng)还(hai)需(xu)要(yao)进(jin)行(xing)手(shou)术(shu)治(zhi)疗(liao),(,)以(yi)重(zhong)建(jian)牙(ya)龈(yin)和(he)骨(gu)骼(ge)结(jie)构(gou)。(。)此(ci)外(wai),(,)保(bao)持(chi)良(liang)好(hao)的(de)饮(yin)食(shi)习(xi)惯(guan)也(ye)非(fei)常(chang)重(zhong)要(yao)。(。)一(yi)些(xie)富(fu)含(han)钙(gai)和(he)维(wei)生(sheng)素(su)D(D)的(de)食(shi)物(wu),(,)例(li)如(ru)牛(niu)奶(nai)、(、)坚(jian)果(guo)和(he)绿(lv)叶(ye)蔬(shu)菜(cai),(,)能(neng)增(zeng)强(qiang)牙(ya)齿(chi)和(he)骨(gu)骼(ge)的(de)健(jian)康(kang)。(。)如(ru)果(guo)有(you)咬(yao)合(he)不(bu)正(zheng)的(de)问(wen)题(ti),(,)使(shi)用(yong)牙(ya)套(tao)或(huo)矫(jiao)正(zheng)器(qi)的(de)治(zhi)疗(liao)方(fang)案(an),(,)可(ke)以(yi)有(you)效(xiao)改(gai)善(shan)牙(ya)齿(chi)的(de)稳(wen)定(ding)性(xing),(,)减(jian)少(shao)松(song)动(dong)的(de)风(feng)险(xian)。(。)最(zui)后(hou),(,)避(bi)免(mian)不(bu)良(liang)习(xi)惯(guan),(,)比(bi)如(ru)用(yong)牙(ya)齿(chi)开(kai)瓶(ping)盖(gai)或(huo)咬(yao)硬(ying)物(wu),(,)能(neng)够(gou)有(you)效(xiao)减(jian)少(shao)牙(ya)齿(chi)受(shou)伤(shang)的(de)几(ji)率(lv)。(。)保(bao)持(chi)良(liang)好(hao)的(de)生(sheng)活(huo)习(xi)惯(guan),(,)比(bi)如(ru)戒(jie)烟(yan)和(he)控(kong)制(zhi)饮(yin)酒(jiu),(,)也(ye)有(you)助(zhu)