中子吸收體 的英文怎麼說
中文拼音 [zhōngzixīshōutǐ]
中子吸收體
英文
absorber of neutron-
Using cd, cu, zn and cr as experimental toxicants and crucian as experimental creature, we employed the environmental biotechniques ( flame atomic absorption spectrophotometry, the method of improved pyrogallol autoxidation and electron microscopy ) to study the acute toxicity and secure concentrations of heavy metals to crucian ; the accumulation and distribution of mixed heavy metals to fingling crucian ; the activities of superoxide dismutase ( sod ) of gill and liver tissues and the hispathological and ultrastructural change of superfine structure of liver and kidney of crucian after cadmium exposure. through which, we intended to fully and systemically study the toxic influence of heavy metals to fish, and preliminarily discuss the influence of heavy metals pollution to the diversified level of fish such as individual, organ, tissue, cell and molecule. thus we tried to provide scientific evidence to establish preventative management measures, avoid and relieve the harm of heavy metals pollution to aquicolous ecosystem in time
隨后以這幾種重金屬作為實驗毒物，以鯽魚為實驗動物，應用環境生物技術、火焰原子吸收分光光度法、鄰苯三酚自氧化法、透射電鏡等技術研究了重金屬cu 、 zn 、 cd和cr對鯽魚的急性毒性及其安全濃度評價、混合重金屬在鯽魚幼體組織內的積累和分佈、 cd對鯽魚鰓和肝臟中sod活性的影響、 cd對鯽魚肝細胞和腎細胞超微結構的影響等，全面和系統地研究了水環境中重金屬暴露對魚類的毒性影響，初步探討了重金屬污染對魚類的個體? ?器官? ?組織? ?細胞? ?分子等各水平層次的影響，為制定漁業生產上預防性的管理措施提供科學依據，及時避免或減輕重金屬污染對水生生態系統造成的損害。We have calculated one - and two - photon absorption cross sections of the lowest excited states of a series of molecules combined with benzene, stilben, thiophene as center attached with amine, diphenylamine, diethylamine as electron - donor and nitryl as electron - acceptor ; the effects of molecular length, n center and electron - donor on two - photon absorption cross sections have been studied and all calculations have been carried out using the density functional theory at an ab initio level. it is found that the molecular length and the one - photon absorption intensity are quite strongly c orrelated factors, and that a corresponding correlation for the two - photon absorption is decreasing. it is also found that a most crucial role for the two - photon absorption is played by the n center
我們分別以苯、二苯乙烯、噻吩為中心，氨基、二苯氨基和二乙氨基為電子給體，硝基為電子受體組合形成的分子為研究對象，在從頭計算的水平上用密度泛函理論計算了這些分子在低激發態下的單、雙光子吸收強度，重點研究了分子的長度、中心和給體的供電子能力對分子單、雙光子吸收的影響。研究結果表明，分子長度與單光子吸收強度之間有密切關系，而在雙光子吸收中這種關系較弱；中心在雙光子吸收中具有重要的作用；在中心和受體一定的情況下，增加給體的供電子能力，可提高雙光子吸收強度。The main study in this paper included as follows : the content and distribution of heavy metals in sediments and benthic organisms from the sewage stream in guangzhou city ; the acute toxicity and joint toxicity of mercury and selenium to swordtail fish ( xiphophorus helleri ) ; the damage of mercury to the indexes of antioxidant system in the gills and livers in swordtail ( including the measurement of the activities of total antioxidative capacity [ t ~ aoc ], superoxide dismutase [ sod ], glutathione peroxidase [ gsh - px ] and the concentration of malondiald - ehyde [ mda ] ) and the relief effects of selenium on it, as well as the physiological damage of mercury on the tissues, namely : the antagonistic effect of na + - k + ~ atpase activity on the tissues between selenite and mercury, and the ultrastructural damage under the exposure of mercury
研究內容主要有：廣州市河涌沉積物及底棲生物體內重金屬含量及評價；汞和硒對劍尾魚的急性毒性和聯合毒性及安全濃度的評價；汞對劍尾魚鰓和肝臟中抗氧化系統的毒性，包括對總抗氧化能力、超氧化物歧化酶、谷胱甘肽過氧化物酶活力及丙二醛含量的測定及硒對其保護作用；汞對劍尾魚組織生理毒性即：汞對na ~ + - k ~ + atpase活力的影響及硒的保護作用和汞和對劍尾魚組織超微結構的損傷等。以高氯酸?硝酸消化法和火焰原子吸收分光光度法測定了廣州市河涌沉積物和底棲生物中重金屬含量。The contents of metal elements in silk gland and silk fiber of b. mori silkworm have been detailedly analyzed by proton induced x - ray emission ( pixe ), inductively coupled plasma mass spectroscopy ( icp - ms ) and atomic adsorption spectroscopy ( aas )
摘要用不同的測試方法，即質子誘導x射線發射（ pixe ） 、電感耦合等離子體質譜（ icp - ms ）和原子吸收光譜（ aas ）對桑蠶絲腺體和絲纖維中金屬元素的含量進行了詳細的表徵。The fluorescence intensity of pb became weak when the crystal phase began to form in tha the lattice vibration absorbed the energy induced by the fluorescent transition
隨著體系中晶態的生成， pb離子進入晶格中，由於晶格振動所產生的聲子吸收了躍遷回落產生的發光能量， pb離子的熒光強度明顯下降。Section : laboratory experiment was carried out to determine mercury accumulation in four organs that were gills, heart, hepatopancreas and gonad of freshwater crab sinopotamon yangtsekiense by using atomic absorption method
汞在長江華溪蟹四種器官的積累以體外暴露的方式，採用還原氣化原子吸收的方法，測定了長江華溪蟹鰓、心臟、肝胰腺和性腺中汞的積累情況。Nuclear criticality safety for fissile materials outside reactors safety requirements for the use of fixed neutron absorbers
反應堆外易裂變材料的核臨界安全固定中子吸收體的應用安全要求Each control rod assembly consists of a number of absorber rods attached to a spider assembly and coupled to the control rod drive mechanism. the absorber rods are made up of neutron absorbers such as silver, indium and cadmium. hence, by adjusting the position of the control rods, the number of neutrons and thus the fission rate in the reactor can be controlled
及控制反應堆的核裂變，部份燃料組件裝配有控制棒，控制棒組件由星型架及多根含銀（ ag ） 、銦（ in ）和鎘（ cd ）的中子吸收體棒所組成，因此移動控制棒的上下位置就可以控制反應堆內中子的數目與及核裂變。And allow control of the fission rate inside the reactor, some fuel assemblies are fitted with control rods. each control rod assembly consists of a number of absorber rods attached to a spider assembly and coupled to the control rod drive mechanism. the absorber rods are made up of neutron absorbers such as silver, indium and cadmium
及控制反應堆的核裂變，部份燃料組件裝配有控制棒，控制棒組件由星型架及多根含銀ag銦in和鎘cd的中子吸收體棒所組成，因此移動控制棒的上下位置就可以控制反應堆內中子的數目與及核裂變。The results of experiments show that the most efficient tpa materials seem to be the ones with various electron - donor ( d ) and electron - acceptor ( a ) moieties attached symmetrically or asymmetrically to a center
實驗結果顯示，最有效的雙光子吸收材料是由電子給體和電子受體對稱或反對稱的與一個中心結合而成的系統。The maximum heating rate of absorber is o. skw. ? h / ? inside experiment fuel rod is much lower than that outside experiment device. influence of absorber movement on thermal neutron flux decreases, as radial distance between absorber and measuring point increases
給出了硼不銹鋼和銀分別做為吸收體的兩種方案的計算結果，即有效增殖因子keff 、中子通量密度分佈、燃料棒功率、吸收體組分及其發熱，並進行了分析、比較，為瞬態試驗裝置的設計提供了參數。We should admit into the party advanced elements of other social strata who accept the party ' s program and constitution, work for the realization of the party ' s line and program consciously and meet the qualifications of party membership following a long period of test, in order to increase the influence and rallying force of the party in society at large
注意在生產工作第一線和高知識群體青年中發展黨員。要把承認黨的綱領和章程自覺為黨的路線和綱領而奮斗經過長期考驗符合黨員條件的其他社會階層的先進分子吸收到黨內來，增強黨在全社會的影響力和凝聚力。The thesis analyzed the effects, associated with the propagation of laser in plasma channel, such as diffraction, plasma defocusing, the third - order intensity - dependent nonlinearity, the relativistic self - focusing, the focusing and defocusing of the plasma channel, and the absorbtion in the collision plasma and the finite pulse length effect
文中用哈密頓-雅可比方程方法和源展開方法分別對激光在等離子體隧道中傳輸所涉及的衍射效應、等離子體散焦效應、三階強度非線性、相對論自聚焦、等離子體隧道的聚焦和散焦效應、碰撞等離子體中的吸收效應、有限脈寬效應等等做了基本的闡述。The items carried out in this course including uv - vis analysis of dyes and organic compounds, determination of cr6 + in aqueous solution, quantitative analysis of inorganic phosphate, quantitative analysis of fe2 +, quantitative analysis of amino acid, application of atomic absorption, conductivity titration, acid - base titration, application of liquid chromatography, anionic chromatography, cationic chromatography, total organic carbon analysis, determination of chlorophyll and application of infrared spectrometer
實驗項目包括染料色素及有機物的紫外光可見光譜分析、水中六價鉻含量測定、無機磷酸鹽的比色定量、試樣中鐵的比色定量、胺基酸的比色定量、原子吸收光譜法的應用、電導滴定方法的應用、酸減滴定法的應用、液相層析方法的應用、陰離子層析、陽離子層析，氣體層析、總有機碳分析、葉綠素含量測定及紅外線光譜法應用。The stronger t he electron - donor is, the more significant the solvent effect is for molecules with a given center. the structure of this thesis is as follows
在中心和受體一定的情況下，碩士學位論文中文摘要給體的供電子能力越強，溶劑對分子的雙光子吸收的影響越大。Test methods for determination of trace elements in coal, coke, combustion residues from coal utilization processes by inductively coupled plasma atomic emission, inductively coupled plasma mass, graphite furnace atomic absorption spect
用感應耦合等離子體原子發射光譜法感應耦合等離子體質譜法和石墨爐原子吸收光譜法測定煤焦碳和煤利用過程中產生的燃燒殘余物中痕量元素的試驗方法In addition, the fission rate in the pwr can also be controlled by adjusting the boron a neutron absorber concentration in the primary coolant circuit
此外，壓水式反應堆的核裂變也可透過調節一迴路內冷卻劑中的硼濃度來控制硼亦是一種中子吸收體。In addition, the fission rate in the pwr can also be controlled by adjusting the boron ( a neutron absorber ) concentration in the primary coolant circuit
此外，壓水式反應堆的核裂變也可透過調節一迴路內冷卻劑中的硼濃度來控制（硼亦是一種中子吸收體） 。The paper studied tin determintation from air samples by using gfaas method with hno2 digestion as a preprocessing
摘要研究了硝酸雙氧水體系消解、石墨爐原子吸收光譜法，測定環境空氣中的錫。This thesis contributed to the comprehensive study of the finite - difference time - domain ( fdtd ) method and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies. the work includes mainly three parts : the study on the performance of pml absorbing boundary condition applied to pseudo low frequency electromagnetic problems ; the validation of the fdtd method with pml absorbing boundary conditions and the corresponding computer software based on the numerical study of the electromagnetic field of an electric dipole antenna, and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies ; the development of an improved alternating direction implicit finite - difference time - domain method
在綜合前人工作基礎上，本文對時域有限差分（ fdtd ）法及其在開關電源輻射電磁場數值計算中的應用進行了系統的分析和研究，其核心內容包括：偽低頻電磁場數值計算中pml吸收邊界條件性能的研究；基於基準問題?電偶極子天線三維輻射電磁場，驗證了本文構造的基於pml吸收邊界條件的三維fdtd法及其計算軟體，並應用於高頻開關電源輻射電磁場的數值分析；提出了一種改進的交替方向隱格式時域有限差分法。分享友人