自然放射性 的英文怎麼說

中文拼音 [zìránfàngshèxìng]
自然放射性 英文
natural radioactivity
  • 自 : Ⅰ代詞（自己） self; oneself; one s own Ⅱ副詞（自然;當然） certainly; of course; naturally; willin...
  • 然 : Ⅰ形容詞（對; 不錯） right; correct Ⅱ代詞（如此; 這樣; 那樣） so; like that Ⅲ連詞[書面語] （然而）...
  • 放 : releaseset freelet go
  • 射 : Ⅰ動詞1 （用推力或彈力送出） shoot; fire 2 （液體受到壓力迅速擠出） discharge in a jet 3 （放出） ...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  • 自然 : 自然at ease; natural; free from affectation
  • 放射性 : [物理學] radioactivity; activity; emissivity
  • 放射 : radiate; emit; blas; radiation; emission; shooting; shedding; abjection; emanation; effluence
  1. It was buried far deeper than myth and the oral history had led us to expect and it emitted radiation and absorbed radiation to simulate the natural character of its surroundings, a mechanical mimesis which is not surprising of itself

    正如我們所猜想的，寶庫是隱藏著的，它比一個謎埋藏的還要深，只有口述的歷史指引我們去想象，他在釋放輻射的同時還吸收輻射，如同它附近物體的自然性質一樣，使我們任何的簡單的機械模仿都無法察覺它的存在。
  2. Rather than taking some 7, 000 years to colonize europe from africa, the reinterpreted data shows the process may only have taken 5, 000 years, scientist paul mellars from cambridge university said in the science journal nature on wednesday. " the same chronological pattern points to a substantially shorter period of chronological and demographic overlap between the earliest. modern humans and the last survivors of the preceding neanderthal populations, " he wrote

    據路透社2月23日報道，來自劍橋大學的科學家保羅米拉斯在最新一期的英國自然雜志上指出，用放射性碳測定年代的一項最新數據表明，人類祖先從非洲進入歐洲后，僅花費了5000年的時間就取代了歐洲早期居民尼安德特人，而不是傳統的理論所認為7000年。
  3. Like galileo, cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity

    如同伽利略號，卡西尼號的能源來自放射性元素鈽的自然衰變，產生熱后再轉換成電。
  4. A number of atmospheric nuclear tests took place from 1945 to 1980. radioactive particulates produced in the explosions dispersed into the atmosphere by the winds and some of them deposited onto the ground. deposition of these radioactive materials increased the level of artificial radiation in the environment

    在一九四五年至一九八零年期間，世界各地進行了多次大氣核試爆，所產生的放射性塵埃隨風擴散，部份沉降到地上。這些放射性沉積物為我們自然環境增加了額外的人工輻射。
  5. In doing so, they have shown that the predictions of chemistry ' s central blueprint, dmitri mendeleev ' s periodic table, extend reliably into the realm of heavy, short - lived, radioactive elements that do not exist in nature

    在這些工作中，他們顯示預測化學的主要藍圖：門捷列夫的元素周期表，即拓展自然界不存在的但可信賴的重的，短期，放的射性的元素。
  6. Secondly, basing on the theory of on - off gain of small signal, the raman gain coefficient for frequency shift between 0. 5 and 20 thz of standard sigle mode optical fiber is measured by pump - probe method through a super luminescent diode ( sld ) as a broadband small signal probe source. thirdly, numerical simulation analysis of gain characteristic of raman fiber amplifier for c band wdm signal light is made according to the raman gain coefficient of the fiber measured before through target and four rank runge - kutta method. at the invariability of wavelength and maximum power of each of two pumps, schematic of powers of two pumps for best flatness on c band wdm optical gain was found out, at the same time, the factors of resulting in gain saturation is analyzed, too

    本文首先應用經典的電磁理論對拉曼光纖放大器的工作機制進行了分析，然後，根據小信號理論推導出的開關增益求出了光纖拉曼增益系數的表達式，採用泵浦-探測波的方法，利用超輻射激光二極體（ superluminescentdiode簡稱sld ）作為探測光源，測量了所用標準單模光纖頻移為0 . 5 - 20thz的拉曼增益系數，之後根據所測得的光纖的拉曼增益系數譜對應用該類光纖構成的放大c波段wdm光信號的拉曼光纖放大器的增益特性採用打靶法和四階龍格- - -庫塔進行了數值計算，在給定了兩個泵浦光源的波長和最大功率后，找出了反向泵浦情況下使c波段wdm光源增益最平坦的兩個泵浦的各自最佳功率，同時也分析了導致信號光飽和的原因。
  7. Contaminating the environment refers to practice - related activities changing the amount of radioactive material in air, water, or soil thereby affecting its normal use in a way that jeopardizing the natural ecology, or damaging property

    一九污染環境：指因輻射作業而改變空氣、水或土壤原有之放射性物質含量，致影響其正常用途，破壞自然生態或損害財物。
  8. At the support of the national natural science fund ( high technique, new concept, new design research ) ( 59685003 ) " study of the integrated performance modeling and optimal design method of the mechanical structure system ", the support plan of the ministry of education for the young excellent teacher ( 1766 ) " study of the mixed soft computation of the mechanical structure based satisficing criterion ", sichuan century excellent young subject leader fund " study of the theory and method of the intelligent optimization of mechanical structure ", and the open project fund of the mechanical transmission state key lab " fuzzy reliability analysis and satisfactory optimization study of mechanical transmission ", the author has the opportunity to touch this new subject and is attracted by it, then make an attempt at it

    在國家自然科學基金（高技術新概念新構思探索） （ 59685003 ） 「機械結構系統綜合性能映射建模及優化設計方法研究」 、教育部優秀青年教師資助計劃（ 1766 ） 「基於令人滿意準則的機械結構系統混合軟計算研究」 、四川省跨世紀傑出青年學科帶頭人培養基金「機械結構系統智能優化原理方法研究」和機械傳動國家重點實驗室開放課題基金「機械傳動模糊可靠性分析與滿意優化設計研究」的資助下，作者有幸接觸這個新的研究方向，被它的風采所吸引，也嘗試做了一些微薄的努力。
  9. Some of this last third are known : genetic predisposition, ultraviolet sunlight, pollutants such as pesticides, and other factors including cosmic radiation and a naturally occurring radioactive gas called radon

    已知的這些原因有：基因缺陷、日光的紫外線輻射、殺蟲劑之類的污染物，其他的原因包括宇宙射線和自然產生的放射性氣體? ?氡。
  10. A naturally occurring or artificially produced radioactive element

    放射性元素自然產生或人為製造的放射性元素
  11. Studies of radioactive and chemical contaminants have taught scientists a great deal about the hazards of toxins and their threat to people and nature

    對放射性物質和化學污染物的研究，使科學家認識到許多關于毒素的危害以及它們對人類和自然的威脅。
  12. Deposition of these radioactive materials increased the level of artificial radiation in the environment

    這些放射性沉積物為我們自然環境增加了額外的人工輻射。
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