中国著名流体力学专家周恒逝世|欧美变态口味重另类
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)
###guanyuzhichuangderenshiyuyingduizhichuangshiyizhongchangjiandegangchangjibing,tongchangshizhigangmenjizhichangfujinxueguankuozhang、zhongzhangerxingchengdebinglixingjiegou。genjuqifabingbuweibutong,zhichuangkeyifenweineizhi、waizhihehunhezhi。neizhifashengzaizhichangnei,tongchangwutong,dankenengbansuibianxue;waizhizeweiyugangmenwai,tengtongmingxian,tebiezaipaibianshigengweimingxian。####zhichuangdezhengzhuangzhichuangdezhuyaozhengzhuangbaokuobianxue、gangmentengtong、gangmenbuweisaoyangjizhongkuaigandeng。qingdudeneizhikenengzhizaipaibianshichuxue,eryanzhongdeneizhizekenengzaipingshiyehuituochui,daozhipaibiankunnan。ciwai,waizhizaixueshuanxingchengshihuichuxianjulietengtong,wangwangranghuanzhebeigankunrao。####zhichuangdechengyinzhichuangdefashengyuduozhongyinsuyouguan,qizhongzuizhuyaodeshichangqidebianmihejiuzuo。bianmihuidaozhipaibianshiyongliguodu,congerzengjiagangmenneideyali,xingchengzhichuang。jiuzuohuobuhuodongyehuishixueyezaixiazhijigangmenbuweizhiliu,daozhixueguankuozhang、zhongzhang。ciwai,yinshibuheli(ruxianweisherubuzu)、renshen、ganyinghuadengyekenengshiyouyin。####yufangyuzhiliaoyufangzhichuangdeguanjianzaiyugaishanshenghuoxiguan。shouxian,yingbaochiguilvdeshenghuo,bimianjiuzuo,zengjiatiyuduanlian,cujinxueyexunhuan。#(#)#(#)#(#)关(guan)于(yu)痔(zhi)疮(chuang)的(de)认(ren)识(shi)与(yu)应(ying)对(dui)痔(zhi)疮(chuang)是(shi)一(yi)种(zhong)常(chang)见(jian)的(de)肛(gang)肠(chang)疾(ji)病(bing),(,)通(tong)常(chang)是(shi)指(zhi)肛(gang)门(men)及(ji)直(zhi)肠(chang)附(fu)近(jin)血(xue)管(guan)扩(kuo)张(zhang)、(、)肿(zhong)胀(zhang)而(er)形(xing)成(cheng)的(de)病(bing)理(li)性(xing)结(jie)构(gou)。(。)根(gen)据(ju)其(qi)发(fa)病(bing)部(bu)位(wei)不(bu)同(tong),(,)痔(zhi)疮(chuang)可(ke)以(yi)分(fen)为(wei)内(nei)痔(zhi)、(、)外(wai)痔(zhi)和(he)混(hun)合(he)痔(zhi)。(。)内(nei)痔(zhi)发(fa)生(sheng)在(zai)直(zhi)肠(chang)内(nei),(,)通(tong)常(chang)无(wu)痛(tong),(,)但(dan)可(ke)能(neng)伴(ban)随(sui)便(bian)血(xue);(;)外(wai)痔(zhi)则(ze)位(wei)于(yu)肛(gang)门(men)外(wai),(,)疼(teng)痛(tong)明(ming)显(xian),(,)特(te)别(bie)在(zai)排(pai)便(bian)时(shi)更(geng)为(wei)明(ming)显(xian)。(。)#(#)#(#)#(#)#(#)痔(zhi)疮(chuang)的(de)症(zheng)状(zhuang)痔(zhi)疮(chuang)的(de)主(zhu)要(yao)症(zheng)状(zhuang)包(bao)括(kuo)便(bian)血(xue)、(、)肛(gang)门(men)疼(teng)痛(tong)、(、)肛(gang)门(men)部(bu)位(wei)瘙(sao)痒(yang)及(ji)肿(zhong)块(kuai)感(gan)等(deng)。(。)轻(qing)度(du)的(de)内(nei)痔(zhi)可(ke)能(neng)只(zhi)在(zai)排(pai)便(bian)时(shi)出(chu)血(xue),(,)而(er)严(yan)重(zhong)的(de)内(nei)痔(zhi)则(ze)可(ke)能(neng)在(zai)平(ping)时(shi)也(ye)会(hui)脱(tuo)垂(chui),(,)导(dao)致(zhi)排(pai)便(bian)困(kun)难(nan)。(。)此(ci)外(wai),(,)外(wai)痔(zhi)在(zai)血(xue)栓(shuan)形(xing)成(cheng)时(shi)会(hui)出(chu)现(xian)剧(ju)烈(lie)疼(teng)痛(tong),(,)往(wang)往(wang)让(rang)患(huan)者(zhe)倍(bei)感(gan)困(kun)扰(rao)。(。)#(#)#(#)#(#)#(#)痔(zhi)疮(chuang)的(de)成(cheng)因(yin)痔(zhi)疮(chuang)的(de)发(fa)生(sheng)与(yu)多(duo)种(zhong)因(yin)素(su)有(you)关(guan),(,)其(qi)中(zhong)最(zui)主(zhu)要(yao)的(de)是(shi)长(chang)期(qi)的(de)便(bian)秘(mi)和(he)久(jiu)坐(zuo)。(。)便(bian)秘(mi)会(hui)导(dao)致(zhi)排(pai)便(bian)时(shi)用(yong)力(li)过(guo)度(du),(,)从(cong)而(er)增(zeng)加(jia)肛(gang)门(men)内(nei)的(de)压(ya)力(li),(,)形(xing)成(cheng)痔(zhi)疮(chuang)。(。)久(jiu)坐(zuo)或(huo)不(bu)活(huo)动(dong)也(ye)会(hui)使(shi)血(xue)液(ye)在(zai)下(xia)肢(zhi)及(ji)肛(gang)门(men)部(bu)位(wei)滞(zhi)留(liu),(,)导(dao)致(zhi)血(xue)管(guan)扩(kuo)张(zhang)、(、)肿(zhong)胀(zhang)。(。)此(ci)外(wai),(,)饮(yin)食(shi)不(bu)合(he)理(li)((()如(ru)纤(xian)维(wei)摄(she)入(ru)不(bu)足(zu))())、(、)妊(ren)娠(shen)、(、)肝(gan)硬(ying)化(hua)等(deng)也(ye)可(ke)能(neng)是(shi)诱(you)因(yin)。(。)#(#)#(#)#(#)#(#)预(yu)防(fang)与(yu)治(zhi)疗(liao)预(yu)防(fang)痔(zhi)疮(chuang)的(de)关(guan)键(jian)在(zai)于(yu)改(gai)善(shan)生(sheng)活(huo)习(xi)惯(guan)。(。)首(shou)先(xian),(,)应(ying)保(bao)持(chi)规(gui)律(lv)的(de)生(sheng)活(huo),(,)避(bi)免(mian)久(jiu)坐(zuo),(,)增(zeng)加(jia)体(ti)育(yu)锻(duan)炼(lian),(,)促(cu)进(jin)血(xue)液(ye)循(xun)环(huan)。(。)