In this thesis, the development of emulsion polymerization theory and related new technologies are comprehensively reviewed, and the synthetic technologies of acrylate latex modified by organosilicon both at home and abroad are also reviewed. based on the current development and research in this field, attentions of this study are focused on three ways for preparing novel acrylate latexes modified by organosilicons, that is, 1 ) the acrylate monomers are copolymerized with unsaturated silicons by emulsion copolymerization ; 2 ) a new latex with microphase separation morphology is synthesized, which shows a core - shell structure character ; 3 ) soap - free polymerization is explored for preparing a higher - performance latex using an unsaturated silicon monomer, different acrylates and a reactive emulsifier. by using techniques of delaying addition of organosilicon monomer and a hydrolysis inhibitor, the hydrolysis and condensation of 3 - ( trimethoxysilyl ) propyl methacrylate during polymerization can be effectively prevented, as a result, organosilicon content in the macromolecular chain is increased
同時採用有機硅單體延遲滴加及添加水解抑制劑等技術,有效防止了-甲基丙烯酰氧基丙基三甲氧基硅烷在乳液聚合過程中的過渡水解及
縮合反應,提高了聚合物大分子鏈中有機硅鏈節的含量;利用紅外光譜與差示掃描量熱儀對產物分子結構進行了表徵,並通過對共聚產物力學和吸水率的測試,證實了本研究所制備的有機硅改性丙烯酸酯共聚物具有比純丙烯酸酯聚合物更優良的力學及耐水性能;從分子設計角度出發,利用醇解反應合成出水解、
縮合反應速率較慢的兩種新型不飽和有機硅單體: ?甲基丙烯酰氧基丙基三乙氧基硅烷和?甲基丙烯酰氧基丙基三異丙氧基硅烷;利用
核磁共振對新型硅烷單體結構進行了證實;研究表明利用新型硅烷單體可以制備出高硅烷含量的有機硅改性丙烯酸酯乳液,且其聚合產物具有較高的力學及耐水性能。
In the first seconds after a supernova, a region rich in protons emerges around the dead star ' s core, which has most likely collapsed into a neutron star
在發生超新星爆炸后的最初幾秒內,這個死亡恆星的
核心(最可能塌
縮形成中子星的地方)周圍,會產生一個富含質子的區域。
The kernel of this method is the emendation of the across moving range bin, which combines the emendation and the range compression
這種方法的
核心是校正越距離單元走動,它是把走動校正跟距離壓
縮結合起來做。
Muscle cells are arranged parallel to their direction of contraction and adopt a fusiform or spindle shape. nuclei are sparse in relation to large amounts of cytoplasm
肌細胞成梭形,與其收
縮方向平行排列,與大量的極細胞胞質比較,細胞
核相對較少散在分佈於質之間。
Nuclear reactors ; graphical symbols and short forms
核反應堆.圖形符號和
縮寫形式
All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core
所有的黑洞都是因為恆星的引力坍
縮而形成,這種恆星通常有一顆巨大而厚重的
核心。
In this model, the resulting implosion and ensuing explosion would blow off the outer envelope of the star and leave behind the core as a neutron star.
按此模型,引起的突然壓
縮和隨后的爆發會把恆量的外部包層吹跑,留下的
核成為一顆中子星。
As for the k production in high energy hics, we firstly study k + production. the results show that the kaon flow is sensitive to both the kaon - nucleon sigma term ( s and the equation of state of nuclear matter. the collective flows of both nucleons and k + mesons need a " soft " eos with compressibility k ? 00 - 300 mev, and 2 = 200 - 400 mev seems suitable to explain the measured k + flow
研究表明k ~ +集體流在相對論重離子碰撞中對
核態方程和k - n標量吸引項( _ ( kn ) )都是敏感的,計算結果表明
核子和k ~ +介子的橫向集體流都需要壓
縮系數在k 200 - 300mev范圍內較軟的
核態方程,而大約為200 - 400mev的_ ( kn )值對解釋k ~ +流產生是合適的。
Many nuclei have become pyknotic ( shrunken and dark ) and have then undergone karorrhexis ( fragmentation ) and karyolysis ( dissolution )
細胞
核固
縮(
縮小和深染) ,接著
核碎裂(形成碎片)和
核溶解(溶解消失) 。
Ultrastructurally, karyopyknosis and karyolysis occured in lymphocytes, and the mitochondria, rough endoplasmic reticulum of lymphocytes in the immune organs were damaged. the nucleus were deformity, the rmtochondrial and rough endoplasmic reticulum were swelling, and the ribosomes were shed in reticular cells of thymus in zinc - deficient ducklings
超微結構顯示缺鋅組淋巴細胞
核固
縮或溶解,線粒體、粗面內質網受損;胸腺網狀細胞
核受損,粗面內質網擴張,線粒體腫脹、嵴斷裂。
Such unprecedented laxity in india will make it hard to get others ? for example, brazil, which already does some uranium enriching of its own ? to accept the tougher inspections
對印度這種沒有先例的寬松將很難使像已經進行了一些鈾濃
縮的巴西那樣的國家接受更為嚴厲的
核查。
( 2 ) the mortality of cp cell in 10 were increasing directly related with the time in the low temperature. after 120d some cp cells died in the way of apoptosis. most nucleus of cells were condensed, and chromosome was marginated beside the nucleus inner membrane, cell sizes were reduced, dna ladder showed in dna gel electrophoresis
( 2 ) cp細胞系在10低溫下細胞死亡率與時間成正比, 120d的細胞具典型的凋亡現象,即細胞
核固
縮、染色體邊集在
核膜內側;細胞體積變小;瓊脂糖凝膠電泳上顯示特徵性的「梯狀」帶。
The effectiveness of the nuclear localization signal selected was clearly tested in initial experiments. based on this, the co - transfection systems used in the study was established. we first observed the multinucleate cells and chromatin bridges in cultured hela cells when the cells are marked with gfp and hochest33342, after co - transfection with the gfp expression plasmids and rnai plasmids rhe or rhc
當分別共轉染附加kozac序列和
核定位信號的gfp與人集
縮素smc亞基hcap一e特異的rnai質粒rhe和人集
縮素smc亞基hca屍一c的f { nai質粒rhc時,都觀察到gfp和hochest33342標記的轉染后hela細胞表現多
核和染色質橋現象。
China has supported the agreed framework ; yet north korea has said that it considers that framework " nullified. " china is a state party to the nonproliferation treaty ; yet north korea - also a member - has clearly violated its npt commitments with its covert uranium enrichment effort
中國支持《核框架協議》 ,但是北韓自稱這個協議已經「無效」 。中國是《不擴散條約》的簽字國,然而北韓它也是成員國暗中提煉濃縮鈾,顯然違反了對《不擴散條約》的承諾。