有效擴散率 的英文怎麼說

中文拼音 [yǒuxiàokuòsǎnlǜ]
有效擴散率 英文
effective diffusivity
  • 有 : 有副詞[書面語] （表示整數之外再加零數）: 30 有 5 thirty-five; 10 有 5年 fifteen years
  • 效 : Ⅰ名詞（效果; 功用） effect; efficiency; result Ⅱ動詞1 （仿效） imitate; follow the example of 2 ...
  • 擴 : 動詞（擴大） expand; enlarge; extend
  • 散 : 散動詞1. （由聚集而分離） break up; disperse 2. （散布） distribute; disseminate; give out 3. （排除） dispel; let out
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 有效 : effective; valid; efficacious
  1. Shortwave channel is time varying transmission channel. it has dispersion in frequency and time domains. this characteristics hinds the data transmi - ssion at high speed and the correction of received data. in this dissertation i have analyzed the statistic characteristic of shortwa - ve channel, established the model of shortwave channel and simulated the rayl eigh fading distribution. the technology of spreading spetrum has been proved that it has the capability for anti - multipath and discerning multipath

    在短波通信中，由於通道的時間色散和頻率色散，引起多徑展寬和多徑衰落，前者限制了數據的傳輸速率，後者造成短波數據通信中出現突發錯誤，為了解決多徑效應對短波通信的影響，本文所做工作如下：首先詳細分析了短波通道的統計特性，建立其數學模型；其次分析了擴頻通信的特點，從理論上證明擴頻技術不僅具有抗多徑干擾能力，而且具有分離多徑的能力；介紹了傳統的rake分集合併技術的特點。
  2. The flow characteristics, distributions of current density and chemical components, and the performance of these two different designs are calculated and compared. the flow and mass transport characteristics are analyzed in detail, which indicate that strong forced convection is produced in the interdigitated flow field, which consist of dead - end gas channel that force the gases through the porous electrodes. results of comparison show that forced convection induced by the interdigitated flow field in the diffusion layer effectively enhances mass transport of reactants and products, thus leading to a higher cell performance and the limiting current density

    在傳統流道設計的pemfc中，反應物從流道到催化層的供應和生成物從催化層到流道的排出主要是以擴散為主，而在交叉梳狀流道設計中，以流動帶動的對流傳遞則占據了主導地位，而且這種以對流為主的傳遞機理大大提高了反應物和產物傳遞速率，從而有效地改善了電池的極限電流密度和極化性能等特性。
  3. The effect of thermal conductivity of membrane on the distribution of temperature in the fuel cell is discussed, and the effect of inlet velocity and porosity of porous diffusion layers on the fuel cell performance are analyzed

    討論了質子膜的導熱率對電池內溫度分佈的影響。分析了進料速度和多孔擴散層孔隙率對電池性能的影響，結果表明較快的進料速度和較大的擴散層孔隙率都能有效提高電池的性能。
  4. At the initial stage of planar technique, b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region, and the good shield effect of sio2 film to b. but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient, the linear slowly - changed distribution of acceptor b in pn junction can not be formed, which could not cater to the requirement of high - reversal - voltage devics. thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed, while the former can lead to relatively large the base - region deviation and abruptly varied region in si, which caused severe decentralization of current amplification parameter, bad thermal stability and high tr ; the latter needed the relatively difficult pack technique, with poor repeatability, high rejection ratio, and poor diffusion quality and productio n efficiency

    在平面工藝初期，由於b在硅中的固溶度、擴散系數與n型發射區的磷相匹配， sio _ 2對其又有良好的掩蔽作用，早被選為npn硅平面器件的理想基區擴散源，但b在硅中的固溶度大（ 1000時達到5 10 ~ （ 20 ） ，擴散系數小， b在硅中的雜質分佈不易形成pn結中雜質的線性緩變分佈，導致器件不能滿足高反壓的要求，隨之又出現了硼鋁塗層擴散工藝和閉管擴鎵工藝，前者會引起較大的基區偏差，雜質在硅內存在突變區域，導致放大系數分散嚴重，下降時間t _ f值較高，熱穩定性差；後者需要難度較大的真空封管技術，工藝重復性差，報廢率高，在擴散質量、生產效率諸方面均不能令人滿意。
  5. The conversion efficiency of 14 % is possible if the al back surface field and the diffusion process are improved

    L 。若進一步改善鋁背場及擴散工藝條件，有望達到14的效率。
  6. In the thesis, we proposed a random lattice model of mea the lattice model randomly occupied by three kinds of particles, pt / c, nafion and ptfe ( poly - tetra - fluoro - ethylene ), was generated on a computer by the means of monte carlo method. it was supposed that current was only produced on those catalysts which have not only channels of electrons via carbon but also have channels of proton via nafion. the purpose of the work, in a word, is to find how many catalysts, pt / c, with such a two - types channels

    本文首先建立了質子交換膜燃料電池的膜電極的隨機方格子模型，在電極模型各格點位置用montecarlo方法生成隨機分佈的電極粒子、 nafion粒子和聚四氟乙烯團粒，認為只有那些既有質子傳輸通道，又有連續的電子通道和氣體擴散通道的胞元才產生有效的電流，而其餘胞元不產生電流，把電極的輸出電流轉化成一個概率事件。
  7. Enterprise wants to expands various degrees of scale in its developmental process, mergers is one of the mainly means of enterprise development. horizontal mergers may expand its scale rapidly, advance scale effect and enlarge their market shares, succeed in scale economy ; vertical mergers may widen channels and reduce cost ; mix mergers may extend scope and depress venture

    企業通過橫向兼并可以迅速擴大企業生產規模，提高企業的規模效益和市場佔有率，實現企業的規模經濟；企業通過縱向兼并可以拓寬企業的渠道，降低企業經營的成本，企業通過混合兼并可以擴大經營范圍，分散和降低企業的經營風險。
  8. It is characterized as the lack of vitality to the agricultural technology innovation, the insufficiency between the effective supply and the effective demand of agricultural technology, the low transfer rate of the scientific and technological achievements, the difficulties in the new technology diffusion, the backwardness of the information network development in agriculture, and the slow speed of the agricultural technology progress

    脫胎于計劃經濟下的中國傳統的農業技術創新機制，已不適應當今社會市場經濟發展要求，其突出表現：農業技術創新乏力，農業技術有效供給與有效需求明顯不足，科技成果轉化率低，新技術擴散困難，農業信息網路落後，農業技術進步緩慢等。
  9. 2 ) most of the tourism enterprises have the characteristics, such as small scale, few cooperation, low competitiveness and fade future. to aggrandize the scale of tio is the effective way to strengthen the industry competitiveness

    2 、旅遊企業「小、散、弱、差」 ，規模不經濟，資源配置效率低，擴大規模是增強產業競爭力的有效途徑。
  10. Part two : organizing strategy of cooperative learning in implementation of new mathematical curriculum this part analyzes the problem in the process of implementing of cooperative learning in new mathematical curriculum by observing in classroom and studying case. six problems is : ( 1 ) the group activity stay on the formal, and lack the material cooperation ( 2 ) individual duty diffuse, " take a ride " phenomenon have the occurrence ; ( 3 ) student social intercourse technical lack. ( 4 ) no change in teacher ' s role, lacking guidance to student ; ? ividing group difficultly for big class formation, fulling of too much noisy in classroom ; ? valuation system is not well, group cooperation exist in name only, provides six suggestions for these problems : ( 1 ) dividing group scientificly and vividly ; ( 2 ) leading student active cooperative learning ; ( 3 ) increasing the individual duty ; ( 4 ) cultivating students " cooperative method and social intercours technical ; ( 5 ) enhancing management in classroom ; ( 6 ) handling a few relations rightly ; finally, puts forward the principle and program of orgnizing cooperative learning in new mathematical curriculum

    二、新數學課程實施中合作學習的組織策略本部分在對實驗區數學課堂觀察和個案研究的基礎上，分析得出了新數學課程實施中合作學習存在的6個問題：小組活動留于形式，缺乏實質性合作；個體責任擴散， 「搭車」現象時有發生；學生社交技能欠缺，合作效率低下；教師對自己角色轉變認識不清，指導作用沒有跟上；大班額分組困難，課堂過于喧嘩混亂；評價體系沒有跟上，小組合作名存實亡。針對這些問題，對新數學課程實施中開展合作學習提出了6方面建議：科學靈活地分組；引導學生主動合作學習；提高個體責任：重視對學生合作方法、社交技能的培養；加強合作學習中課堂管理；正確處理幾對關系。最後提出了新數學課程實施中合作學習的組織的原則和組織序列。
  11. Clk - proliferation cyclone applicable to the collection of non - fiber drying of granular dust is the main characteristics of a conical dongshen, thus reducing the dust since the dongshen gas exports to the centre to short - circuit the possibility and install a conical reflector screen to prevent the two air separation will have to roll up the dust down, brought out by the increased flow, thereby enhancing the efficiency of dust

    Clk擴散式旋風除塵器，適用於捕集乾燥的非纖維性的顆粒狀粉塵，主要特點是筒身呈圓錐形，因而減少了含塵氣體自筒身中心短路到出口去的可能性，並裝有圓錐形的反射屏，防止兩次氣流將已經分離下來的粉塵重新捲起，被上升氣流帶出，因而提高了除塵效率。
  12. Compared with green light - emitting device, blue oled has many problems such as brightness, efficiency, stability, and color saturation, in this study we investgaited the blue oleds systemically : 1 ) double heterosturcture oled was charaterized. due to the introducing of electron transport layer alq3 and hole - blocking layer balq3, the energy matching was more reasonable and the carrier injecting was more effective in the double - layer device. the maximum efficiency and luminance of this device attained to 1. 90 lm / w and 10, 000 cd / m2, respectively

    其次，由於一直以來藍光oled器件的研究處于相對落後的狀態，其發光亮度、效率、穩定性和色純度都無法綠光器件相比，所以本論文在以下幾個方面對藍光器件的性能進行了系統的研究: 1 ）研究了雙異質型藍光oled器件，由於本研究引入了空穴阻擋層，使得載流子的復合和激子的擴散被限定在發光層內，器件的發光效率達到了1 . 90lm / w ，最大亮度達到了10000cd / m2 ，比傳統結構器件的效率和亮度提高了約一個數量級; 2 ）制備了結構為ito / npb / balq3 / alq3 / mg : ag的oled器件，研究發現，當改變各有機層厚度時，器件的電致發光光譜發生了從綠光到藍光的移動。
  13. The author also analyzed the difference and relationship of the basic concepts of narrow - sense extension, broad - sense extension, modern extension and chinese - character extension, agro - technical development, rural development, rural education, agro - science and technology transfer, agro - business integration and rural social service, re - cogitated the basic principle of agriculture renovation and spread, agriculture sci - tech transfer, farmer behavior, agriculture development, it is believed that the principle of agriculture renovation and spread is the basic theory of agriculture extension, agriculture sci - tech transfer theory is an unique theory of agriculture extension in china and the theory of farmer behavior mainly relate to the rate of farmer " s adoption to the renovation, and the theory of agriculture development mainly solves the problems for effective exchange and communication among the three branch systems of agriculture research, agriculture extension and farmers

    分析了狹義農業推廣、廣義農業推廣、現代農業推廣、中國特色農業推廣、農業技術開發、農村發展、農村教育、農業科技成果轉化、農業經營產業化、農村社會化服務等基本概念的區別與聯系。重新認識了農業創新擴散、農業科技成果轉化、農民行為轉變、農業發展系統等農業推廣的基本原理，認為農業創新擴散原理是農業推廣的最基本原理，農業科技成果轉化原理是我國農業推廣的特有原理，農民行為轉變主要是解決提高農民采納創新效率的問題，農業發展系統原理主要是解決農業科研、農業推廣和農民三個亞系統的有效交流與溝通問題。
  14. From the concentration dependence of bsa apparent diffusion coefficients, protein interaction parameters have been regressed. it bears a net effective charge of - 9. 0 and has a hamaker constant of 2. 8ket

    根據擴散系數隨蛋白濃度變化的斜率與離子濃度變化的相關性，回歸出了蛋白相互作用參數，蛋白所帶的有效電荷zp二一9 . oe 、 hamaker常量= 2
  15. Another important conclusion the present study reached is that the controlling of diffusion coefficient do and evaporation coefficient f0 is efficient for the deduction of the possibility of the " popcorn " delaminations, in specific with controlling evaporation coefficient

    對裂尖能量釋放率的影響較大，因此，控制擴散系數do和蒸發系數f 。能有效地降低電子元件發生「爆米花」式脫層斷裂的可能性，尤其是控制蒸發系數f 。
  16. In order to solve problems existing in current measuring methods for radon exhalation rate ( such as the effect of unequilibrium radon and its progeny, humidity effect, leak and back - diffusion effect, etc. ), based on the principle of surveying radon and its progeny in the medium surface, a rapid arid accurate method for measuring radon exhalation rate taking advantage of the rad7 radon detector was established

    摘要本文根據介質表面氡析出率的測量原理，針對目前國內外現有的氡析出率測量方法中存在的一些問題，如對氡及其子體的不平衡影響、濕度效應及泄漏和反擴散等影響未作修正等，實驗研究了一種用rad7型氡氣檢測儀快速測定土壤、巖石、建材和尾礦等介質表面氡析出率的方法。
  17. Many factors which affect the epitaxy qualities, especially the porosity of porous silicon and growth temperature, have been studied in detail. it is found that the pre - oxidation of porous silicon can efficiently prevent the boron diffusion during epitaxy. the defaults along { 111 } are the main defects in epitaxial silicon layer

    深入研究了影響外延的各種因素，特別是多孔硅的孔隙率和外延溫度對外延層質量的影響，發現多孔硅的預氧化可以有效地阻止外延時b的擴散，外延層中主要的缺陷是沿著{ 111 }面生長的層錯。
  18. The condensation heat - exchange characteristic of a separate - type heat - pipe was studied on a 1 : 1 model. the heat pipe is heated by electricity, and working fluid is distilled water, and it is cooled by air. the experimental results show that, ( 1 ) when charging liquid ratio is 45 %, condensation heat - exchange coefficient reaches to maxium ; ( 2 ) when there is not non - condensing gas, the coeffcient decreases a little with the increase of vapour pressure, and it decreases by 9. 5 % when the pressure increases from 0. 16mpa to 0. 36mpa ; ( 3 ) when there is non - condensing gas, the coefficient decreases a little, but when the gas is discharged by an exhaust value, it can be improved, when the volume content of the gas is 2. 5 %, it can increased by 22 % ; ( 4 ) the effect of the non - condensing gas on the coefficient decreases with the increase of the pressure, and when the volume content of the gas is 5 % and the pressure increases from 0. 16mpa to 0. 36mpa, the coefficient increases by 6 %. the relative curves are given between condensation heat - exchange coefficient and air flowrate, charging liquid ratio and vapour pressure

    建立了空氣冷卻實驗臺，熱管的加熱方式為電加熱，工質為蒸餾水.在1 1模型上對分離式熱管管內凝結換熱特性、不凝性氣體對凝結換熱的影響及不凝性氣體的擴散規律進行了試驗，得出分離式熱管有一最佳充液率，其值為45 %左右；凝結換熱系數隨著蒸汽壓力的增加略有降低，在實驗的壓力范圍內，降低了9 . 5 % ；不凝性氣體對分離式熱管的凝結換熱僅影響冷凝段下部較小部分，通過排氣閥排出不凝性氣體可有效地改善冷凝段下部的凝結換熱；隨著壓力的增加，不凝性氣體對分離式熱管冷凝段的影響減少.這些結論可用於分離式熱管換熱器的工程設計和控制
  19. Abstract : the condensation heat - exchange characteristic of a separate - type heat - pipe was studied on a 1 : 1 model. the heat pipe is heated by electricity, and working fluid is distilled water, and it is cooled by air. the experimental results show that, ( 1 ) when charging liquid ratio is 45 %, condensation heat - exchange coefficient reaches to maxium ; ( 2 ) when there is not non - condensing gas, the coeffcient decreases a little with the increase of vapour pressure, and it decreases by 9. 5 % when the pressure increases from 0. 16mpa to 0. 36mpa ; ( 3 ) when there is non - condensing gas, the coefficient decreases a little, but when the gas is discharged by an exhaust value, it can be improved, when the volume content of the gas is 2. 5 %, it can increased by 22 % ; ( 4 ) the effect of the non - condensing gas on the coefficient decreases with the increase of the pressure, and when the volume content of the gas is 5 % and the pressure increases from 0. 16mpa to 0. 36mpa, the coefficient increases by 6 %. the relative curves are given between condensation heat - exchange coefficient and air flowrate, charging liquid ratio and vapour pressure

    文摘:建立了空氣冷卻實驗臺，熱管的加熱方式為電加熱，工質為蒸餾水.在1 1模型上對分離式熱管管內凝結換熱特性、不凝性氣體對凝結換熱的影響及不凝性氣體的擴散規律進行了試驗，得出分離式熱管有一最佳充液率，其值為45 %左右；凝結換熱系數隨著蒸汽壓力的增加略有降低，在實驗的壓力范圍內，降低了9 . 5 % ；不凝性氣體對分離式熱管的凝結換熱僅影響冷凝段下部較小部分，通過排氣閥排出不凝性氣體可有效地改善冷凝段下部的凝結換熱；隨著壓力的增加，不凝性氣體對分離式熱管冷凝段的影響減少.這些結論可用於分離式熱管換熱器的工程設計和控制
  20. In the microcosmic field : ( 1 ) from the disciplinary of hole in loess diversification, that the disciplinary of effective hole in loess diversification is the microcosmic incarnating of the disciplinary of collapsible speed diversification was pointed ; ( 2 ) the function between distributing density of effective hole and time was established by dla

    在微觀角度上： （ 1 ）從孔隙率變化規律出發，指出有效孔隙的變化規律是濕陷速率變化規律的微觀表現； （ 2 ）利用有限制的擴散凝聚（ dla ）模型，得出了有效孔隙分佈密度與時間的函數關系式。
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