threshold concentration 中文意思是什麼

threshold concentration 解釋
極限濃度
  • threshold : n. 1. 門檻；入口，門口。2. 【心理學】閾限。3. 界限，限度。4. 【物理學】臨界值，閾。5. 入門，開始，開端。
  • concentration : n. 1. 集中。2. 【化學】提濃，蒸濃，濃縮；濃度；稠密度；【礦物】汰選，選礦，富化。3. 集中注意，專心。
  1. Increasing ultrasound intensity in the range of cavitation threshold and cavitation peak value, decreasing monomer concentration and increasing the temperature make the induction period shorter. under optimized reaction conditions, the conversion of ba can reach 90 % in 11 min at high n2 flow rate the viscosity average molecular weight of the obtained pba reaches 5. 24 106. the molecular weight of pba varies with ultrasonic irradiation time, indicating that the ultrasonic induced emulsion polymerization is dynamic and quite complicated, polymerization of monomer as well as degradation of polymer occurs concomitantly

    一、實現了無常規化學引發劑存在下的超聲輻照引發丙烯酸正丁酯（ ba ）間歇乳液聚合，制備了pba納米粒子，在11min內轉化率達到90 ，分子量達5 . 24 10 ~ 6 ，隨反應時間的延長而降低，表明超聲輻照引發乳液聚合是一個動態的復雜過程，單體的聚合和聚合物的降解同時發生。
  2. The laser damage threshold of the ybyp _ xv _ ( 1 - x ) o _ 4determined by nd : yag laser, which showed a decreasing tendency with the increase of the dopant concentration

    利用nd : yag激光器測試晶體的激光損傷閾值，隨著摻雜離子濃度的增大，激光損傷光功率密度呈減小趨勢。
  3. The threshold differentiate two classes, that is concentration and trend, they contain nomorl and margin and abnormal separately

    界限值分為濃度和趨勢兩類，分別包括正常、臨界和異常3個等級。
  4. The main work can be summed up as follows : firstly, we studied the thermal - field properties of vcsels, and analyzed the influences of current spreading, material parameters and operating conditions on the temperature distributions. secondly, we began with the electrode voltage and calculated the equipotential s distributions, compared the distributions of voltages and current densities in different depths of vcsels, and then studied the influences of the oxide - confining region with different position or thickness, and the different sizes of the gain - guided aperture and emitting window on the distributions of the injected current density, carrier concentration and temperature in the active region. thirdly, we realized the coupling of electricity, optical and thermal - fields, worked out the threshold voltage, calculated the distributions of the injected current density, carrier concentration and temperature under different offset voltages, and analyzed the impacts of temperature profile and carrier density on the refractive index, fermi levels and optical - field

    具體工作可以概括如下：首先，研究了vcsel的熱場特性，分析了電流擴展，材料參數和工作條件對于溫度分佈的影響；其次，從電極電壓入手，計算出激光器中的等勢線分佈，並對不同深度處的電壓和電流分佈進行比較，研究了高阻區的不同位置和不同厚度、限制層和出射窗口半徑的大小對電流密度、載流子濃度和溫度分佈的影響；再次，實現了電、光、熱耦合，求出了閾值電壓，計算了不同偏置電壓下的電流密度分佈、載流子濃度分佈和熱場分佈，分析了溫度和載流子濃度變化對折射率、費米能級和光場的影響；最後，給出了考慮n - dbr和雙氧化限制層時激光器中的等勢線分佈，分析了n - dbr和雙氧化限制層對vcsel電流密度、載流子濃度、溫度和光場分佈的影響。
  5. In this paper, some investigation and design as following. have been carried out on er - yb codoped phosphate glass waveguide laser first, three primary performance parameters of er - yb waveguide laser pump threshold power ; output power and slope efficiency have been commulated and analysed theoretically based on er ~ ( 3 + ) - yb ~ ( 3 + ) energy configuration ; rate equation of stable state and transmitting equation. the influences of er - yb ions concentration ; enabled waveguide length ; light dot radius of signal light and pump light ; reflectivity of output lens on three above parameters have been researched

    首先，從er ~ （ 3 + ） - yb ~ （ 3 + ）能級結構出發，結合激光穩態速率方程與傳輸方程，對鉺鐿波導激光器的三個主要性能參數:閾值功率、輸出功率、斜率效率作了理論計算分析，並研究了鉺、鐿離子濃度、光波導激活長度、信號光與泵浦光光斑半徑比例、輸出耦合鏡反射率對這三個關鍵性能參數的影響。
  6. The results showed that the concentration, size and shape of si particles in altilola, ast101a and zl101 had some effects on the fatigue threshold, and the irregular shaped brittle phase of fe intermetallics caused the fatigue threshold decreased

    結果表明， ast101a 、 aiti101a和zl101中51粒子的濃度、大小和形貌對材料疲勞門檻值的高低有一定的作用，脆性的富fe相是疲勞門檻值降低的另一個重要原因。
  7. The results showed that the replacement of individual polymer by polymer blend as the matrix resin for ecmb could be applied to the design of ecmb with lower percolation threshold concentration

    結果表明，以聚酯聚乙烯共混聚合物代替單一的聚合物作為母粒的載體樹脂可用來設計具有低突增界限濃度的炭黑導電母粒。
  8. In the honeycomb lattice with random transverse field, a smaller crystal field cannot change the percolation threshold of critical transverse field. the reentrant phenomena shall appear at the range of certain random concentration when the transverse field takes a larger value, while the reentrant phenomena do not occur and when the transverse field take a smaller value

    隨機橫場作用下的蜂窩格子中，較小晶場的存在並不能改變臨界橫場閾值；取較大橫場值時在某些隨機濃度范圍內出現重入相變現象，而取較小橫場值時則沒有重入現象產生。
  9. The amount of nickel released from the euro coins was up to 30 times above a level regarded by scientists as the concentration threshold for reactivity to a single exposure

    實驗結果表明，當人們手拿這種硬幣時接觸到的鎳竟然比科學家實驗得出的能夠引起過敏反應的最低鎳濃度高出30倍。
  10. Threshold limit value （ tlv ） means under the condition of a specified concentration, it is not harmful to human beings to keep handling the product for 8 hours a day or 48 hours a week

    最大允許濃度（ tlv ）所指的是在所定的濃度環境下，操作人員可以保持每天8小時，每周48小時的正常工作，而不會對人體造成損害。
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