慢中子通量 的英文怎麼說
中文拼音 [mànzhōngzitōngliáng]
慢中子通量
英文
slow -neutron flux-
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。The activation effect of zn2 + modification, including enhancement of emission intensity, slowing of luminescence decay and increasing of quantum yields, results from the formation of zns shell outside the nanoparticles, which is passivating the surface of nanoparticles, eliminating the surface quenching centers, so as to block the nonradiative transition pathways through these kind of quenching centers
Zn ~ （ 2 + ）表面修飾在納米顆粒表面形成了zns殼層，鈍化了納米顆粒的表面，消除了表面猝滅中心，阻塞了通過表面猝滅中心進行無輻射躍遷的通道，從而使得發光強度增加，衰減變慢，量子效率提高。According to the demand of the concept design of china spallation neutron source ( csns ), the target station, i. e. the target, the reflector and the moderator have been simulated and optimized using monte carlo simulation software, nmtc / jam and mcnp4a, firstly. the neutron flux escaping from the target and the moderator and the heat deposition in the target, the reflector and the moderator are calculated. these results provided essential data as a basis of the spallation neutron source design
本論文結合當前中國散裂中子源（ chinaspallationneutronsource ， csns ）工程概念設計的迫切需要，選擇國際上廣泛使用的基於蒙特?卡羅方法，用於模擬粒子輸運過程的程序mcnp4a和nmtc jam作為研究工具，首次對csns靶站進行了全面的模擬與優化，內容包括靶、反射體與慢化器系統的中子通量分佈以及熱量沉積，同時計算了靶的溫度場與應力場分佈。The reflector can increase the neutron flux obviously and the main processes of the neutron yield in reflector are spallation reaction induced by energetic hadrons and ( n, 2n ) reaction. when the moderator height is equal to the distance between the upper part and the lower part of the split target, the total neutron flux of the split target will be higher by 20. 1 % than that of the integral one. secondly, the high - energy neutron escaping from the target will enter into the moderator and be slowed down
得到經水慢化器慢化后，中子通量在慢化器厚度與高度方向上的分佈；比較了水與液態氫的慢化能力以及中子在水、液態氫、液態甲烷這三種慢化器慢化后的能譜；在csns的靶站設計中，引出慢中子的導管不完全位於慢化器中子引出面的法線方向上，因此進一步計算了中子通量角分佈。At the time of design, the measurement of dispersion and interaction impedance will be used as design verification and improvement. at the time of manufacture, the measurement will find the problems of the slow - wave structures in machining, weld and fitting
在管子研製階段，對色散和耦合阻抗冷參量的測量可以起到驗證、改進設計的作用;在管子生產階段，通過測量可以及早發現慢波結構在加工、焊接、裝配過程中的問題，防止瑕疵品繼續流水作業，提高生產效率。While the new components having the same numbers with these original physical vectors are introduced and the new components are combined with those original physical components to form a new symplectic space, the ray problem of wave propagation in geometrical optics is converted into the problem of lagrange submanifold in the symplectic space
通過引入波向量（慢度向量） ，將物理空間中幾何光學的射線問題轉化為辛空間中的lagrange子流形（超曲面）問題。At first, the effect of the target on the neutron flux is discussed to determine the optimal proton energy, target material, shape and dimension by using the high - energy particle transport code nmtc / jam
首先利用高能粒子輸運程序nmtc jam計算了入射質子能量、靶的材料、形狀、尺寸以及靶與慢化器耦合對中子通量的影響。The mode competition is much improved. it may operated with a large electron beam radius, that means decreasing the space charge effects compared with a smaller radius beam with the same current, hence the rbwo may operated with a low axial guide magnetic field. besides, the rbwo with a sinusoidal corrugated coaxial structure is very easy to manufacture
波紋內導體rbwo具有一些突出優點:同軸結構中內導體的存在使系統的截止頻率顯著升高，使得系統尺寸可比普通波紋波導慢波系統大;具有很大的抑制模式競爭的能力和很高的功率容量;可以採用大半徑電子注，在工作電流不變的情況下空間電荷效應大幅度降低，因而可以工作在低磁場狀態;此種慢波結構內導體上的波紋易於加工。Alpha eigenvalue is an characteristic parameter in neutron chain reaction physics. it describes the variational velocity of neutron flux along with time
本徵值是中子鏈式反應物理中表徵系統動態性質的一個重要特徵量，描述中子通量密度隨時間按指數規律變化的快慢。In order to solve the problem of pheromone shortage and slow convergent speed of existing ant system algorithm ( as ) in its application to complex optimal searching, this paper presents a new hybrid adaptive ant system algorithm with pheromone weight multiplier and pheromone balance operator, which can adaptively adjust select probabilities and pheromone strength
摘要針對已有蟻群演算法在復雜問題應用中尋優前期信息素匱乏、收斂速度慢的不足，通過引入信息權重因子和信息量均衡運算元對蟻群的選擇概率和信息素濃度進行自適應調節，提出了混合自適應蟻群演算法。An instrument for measuring time, consisting of two glass chambers connected by a narrow neck and containing a quantity of sand, mercury, or another flowing substance that trickles from the upper chamber to the lower in a fixed amount of time, often one hour
沙漏；滴漏用於計時的儀器，由兩個玻璃盒組成，中由一細頸相連，盒內裝有一定量的沙子，水銀或其他流動物質，這些物質在一固定量的時間里，通常為一個小時，從上方的盒內慢慢流入下方的盒子中分享友人