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     The amount of matrix in calcium oxalate calculi is higher,the amunt of THP released per-unit surface area is 40.879±4.5ng/mm2 and the rate is 0. 68lng /mm2· min.
     草酸钙结石基质含量较多,单位面积释放量为40.879±4.5ng/mm ̄2,速度为0.68lng/mm ̄2·min;
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     Elevated CO_2 also decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass,which might be one of morphological reasons why root activity decreased under FACE condition.
     高浓度CO2显著降低水稻和稗草单位根重根毛数,这可能是CO2浓度升高条件下根系活力显著降低的形态学原因之一。
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     The optimal conditions for preparing the catalysts were confirmed, and the yield of PAP could reach 55.7%. The specific activity on per-unit surface of the Pt-SiO2 catalysts was higher than that of the Pt/SiO2 catalysts prepared by incipient impregnation.
     确定了适宜的制备条件,其对氨基苯酚的收率为55.7%,此催化剂单位表面积的比活性高于浸渍法制备的Pt/SiO_2催化剂。
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     Considering the distributed capacitance parameter, the per-unit length equivalent circuit model of interconnects can be synthesized by finite number poles based on impedances at multi-frequency points.
     考虑互连线分布电容参数,并根据多个频点阻抗值,用有限数量极点,综合得到互连线单位长度的等效电路模型。
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     With the per-unit value of ecosystem services by Costanza et al and the per-unit value of the ecosystem services in natural grasslands of China by Xie Gaodi et al for reference, the paper preliminarily estimates the ecological loss of the vegetation-coverage variation of degenerated grasslands,and analyzes the effects of the vegetation-coverage variation of grassland on the macro-economy in the ecosystem of the area under study.
     并参照Costanza等的生态系统服务功能的单位价值和谢高地等人的中国自然草地生态系统服务价值,初步估算退化型草地植被覆盖变化的生态损失价值,对草地植被覆盖变化给研究区生态系统宏观经济所造成的影响进行了分析研究。
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  “per-unit”译为未确定词的双语例句
     Computing Average and RMS Currents in a Three-Phase PWM Inverter by Per-Unit Value
     用标幺值计算PWM逆变器中电流平均值和有效值
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     Detecting Device of Flowrate to Per-unit on the Gate -Development of well-angle-machine
     闸门定流量检测装置——井角机的研制
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     Per-unit System and Conversion in Power System
     电力系统标幺制与归算
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     A PER-UNIT STATCOM MODEL AND ANALYSIS OF OPEN LOOP RESPONSE TIME CONSTANT
     静止同步补偿器的标幺化模型及开环响应时间常数分析
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     Considering the problems of convergence and multi-solution of the Least-Square -Estimation(LSE), using the synchronous machine's model with Uδ per-unit system, the Singular Value Decomposition theory and estimating parameters of d-axis and q-axis alternately, the convergence and the problem of multi-solution are improved, and the iteration number of estimation algorithm is reduced.
     针对最小二乘辨识算法存在多值性及收敛性的问题,采用U_δ标幺值系统同步电机数学模型,将奇异值分解理论应用于同步电机参数最小二乘辨识中,采用d轴参数与q轴参数独立交替辨识,使算法的多值性及收敛性得到有效地改善,迭代次数明显减少。
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     Per(f);
     Per(f);
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     ex Per.
     ex Per.
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     Per-Pixel Lighting
     基于象素的光照计算技术
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     Thetheoreticalresultsareappliedtocalculatethevariationoftheor-bitalelementsofthesynchronouscomponentinAlgol(βPer).
     文中将理论结果应用于同步双星βPer(大陵五双星)的计算上。
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     The model is in the per-unit system.
     模型以标么值形式表示的。
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  per-unit
Measurements of the plastic work associated with the shear lips show that the per-unit-volume shear lip fracture energy, φSL = 0.21 J/mm3, is essentially constant over this range of velocity.
      
The deviation of a firm's actual average per-unit cost from the fitted value is proposed as a predictor of firm profitability.
      
A translog cost function is estimated, and fitted per-unit average cost figures are generated based upon the firm's individual characteristics and industry norms.
      
Then banning price discrimination may cause per-unit prices to fall and welfare to increase.
      
We show how producers can use per-unit tariffs to achieve cooperative outcomes without colluding directly over consumer prices.
      
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Equations determining the velocity and density distributions within the mixing region of two incompressible gases with different densities are set up, their temperatures being assumed to be the same. For incompressible mixing the total number of gas molecules per unit volume is constant, although the density of the gaseous mixture varies from point to point due to diffusion of matter. As an illustration we consider the plane jet and steady motion. The boundary layer method of approximation can still be applied....

Equations determining the velocity and density distributions within the mixing region of two incompressible gases with different densities are set up, their temperatures being assumed to be the same. For incompressible mixing the total number of gas molecules per unit volume is constant, although the density of the gaseous mixture varies from point to point due to diffusion of matter. As an illustration we consider the plane jet and steady motion. The boundary layer method of approximation can still be applied. The boundary of the jet is shown to be the same as that for one fluid. The solution of the problem then depends upon the numerical value of the coefticient of viscosity of the mixture which is a function of the number of molecules of each constituent gas in the unit volume. The present method of investigation is applicable to the cylindrical and half jets and also to the case where the two gases are at different temperatures.

本文求出规定二不能压缩气体的分片合流运动时,速度与质量密度分布的微分方程式。假定两种气体的密度不同但温度则相等。不能压缩的定义是每单位体积中的两种气体分子数的和不变。本文只讨论一平面守恒注中所需要的微分方程式。粘滞流体运动中之边界近似法仍可应用。同样方法亦可用到守恒圆柱体注,半注及气体中温度不同诸问题。

In this paper, the author proposes a simplified method for designing concrete mix. In this method cement paste is considered as one ingredient instead of two separate ingredients——cement and water. The function of cement paste in fresh concrete is that a large portion of the paste fills the void space in the mixed fine and coarse aggregates, and only a small portion coats the surface of the aggregate particles. Therefore the required amount of cement paste is predominantly determined by the void space of the...

In this paper, the author proposes a simplified method for designing concrete mix. In this method cement paste is considered as one ingredient instead of two separate ingredients——cement and water. The function of cement paste in fresh concrete is that a large portion of the paste fills the void space in the mixed fine and coarse aggregates, and only a small portion coats the surface of the aggregate particles. Therefore the required amount of cement paste is predominantly determined by the void space of the mixed aggregates. The important problem is how to determine the relative amounts of fine and coarse aggregates and cement paste per unit volume of concrete so as to achieve the required strength, durability, workability and economy.

設計混擬土配合比的方法很多,有繁有簡,繁的需要很多試驗与計算,簡的編成配合此表,祇需按表試配。新的方法还在不断創造,趨向于簡化試驗与計算手續,但又要能切合实际,容易得到符合要求的配合比。早在1948~1949年,作者根据混凝土組成原理,——絕大部分水泥漿是用來填充砂石间空隙,很小部分用來包裹砂石粒面及超潤滑作用——先求得最小砂石混合空隙率,加一常数,就可定出最經济水泥漿量,經过試配,確定最終配合比。1951~1952年,幾处工地試用,当時祇能做出水灰此为0.7坍落度3—7厘米的混凝土。1953~1954年,通过学習苏联混凝土技術,將本法發展到適用於各种要求的混凝土,即灰水比坍落度可任意改变,形成目前較完善的形式,合於工地及試驗室採用。本法在选定灰水比及坍落度後,祇需2—3步即可求出配合此,並算出材料用量;本法計算簡便,祇用兩个簡單的表(表1和表3);本法在進行中有自己校核的作用,計算秤量中如有錯誤容易查出。本法祇需極簡單的設备,易於学習,在大同及大伙房水庫工地祇經一小時的講解,試驗員即会应用。本法通过試配,应用的理論和數据都有正確根据,所以結果能切合实际。希望大家試用研究,提出改進意見,使本法日趨完善,並能逐...

設計混擬土配合比的方法很多,有繁有簡,繁的需要很多試驗与計算,簡的編成配合此表,祇需按表試配。新的方法还在不断創造,趨向于簡化試驗与計算手續,但又要能切合实际,容易得到符合要求的配合比。早在1948~1949年,作者根据混凝土組成原理,——絕大部分水泥漿是用來填充砂石间空隙,很小部分用來包裹砂石粒面及超潤滑作用——先求得最小砂石混合空隙率,加一常数,就可定出最經济水泥漿量,經过試配,確定最終配合比。1951~1952年,幾处工地試用,当時祇能做出水灰此为0.7坍落度3—7厘米的混凝土。1953~1954年,通过学習苏联混凝土技術,將本法發展到適用於各种要求的混凝土,即灰水比坍落度可任意改变,形成目前較完善的形式,合於工地及試驗室採用。本法在选定灰水比及坍落度後,祇需2—3步即可求出配合此,並算出材料用量;本法計算簡便,祇用兩个簡單的表(表1和表3);本法在進行中有自己校核的作用,計算秤量中如有錯誤容易查出。本法祇需極簡單的設备,易於学習,在大同及大伙房水庫工地祇經一小時的講解,試驗員即会应用。本法通过試配,应用的理論和數据都有正確根据,所以結果能切合实际。希望大家試用研究,提出改進意見,使本法日趨完善,並能逐漸推廣,在混凝土工程中發揮墳產節約与保證質量的作用。

An investigation of the rheological relationships between shear stress shear rate apparent bulk viscosity temperature was carried out by examining the viscous flow of slightly milled native Hevea rubber (i) The Eisenschitz's equation for non-Newtonian flow has been verified by the experiments on the dependence of shear rate on shear stress. By this equation, the apparent viscosity can be referred to the Newtonian viscosity η_0 (at σ=0). The parameter (G_i=3.30×10~5 dynes/cm~2), interpreted as an internal...

An investigation of the rheological relationships between shear stress shear rate apparent bulk viscosity temperature was carried out by examining the viscous flow of slightly milled native Hevea rubber (i) The Eisenschitz's equation for non-Newtonian flow has been verified by the experiments on the dependence of shear rate on shear stress. By this equation, the apparent viscosity can be referred to the Newtonian viscosity η_0 (at σ=0). The parameter (G_i=3.30×10~5 dynes/cm~2), interpreted as an internal modulus of rigidity, was found to be practically independent of temperature in the range of 50-90℃, thus agreeing with the results by treating Saunder and Treloar's data. (ii) For the shear rate dependence of apparent viscosity, when the number of Khun segments per unit volume was taken into account for the calculation of retardation time τ_1=2.84η_0 [J_e]_∞, the Debye-Bueche's equation was found to be able to fit into our data at moderate low shear rates. The values of steady-state elastic compliance [J_e]_∞ were determined by elastic-recovery experiments. Furthermore, the internal shear modulus Gi could be thus calculated by combining the Eisenschitz's equation with the Debye-Bueche's one. (iii) From the experiments on the temperature dependence of viscous flow under various stresses, the apparent activation energy ΔE_η was found to be 12.7 kcal/mole; and therefrom, by estimation, the unit of flow-the Eyring segment would be 30 carbon atoms long. All determinations of the flow rate under constant stress were carried out in a Hppler parallel-plate plastometer, used as a viscoelasticity-rheometer according to the theory developed by Dienes.

1.本實驗採用了Hoeppler平行板塑性計,按照定應力壓縮形變法的理論,在中温時對國產天然橡膠的本體粘性流動進行了流變學研究。 2.在30-90°與250-1500克/厘米~2的荷重範圍內,測定了貌似本體粘度η_a,內切模數G_i與貌似活化能ΔE_η。所測得的G_i=3.30×10~5達因/厘米~2與ΔE_η=12.7千卡/克分子,在一定温度範圍(50-90°)內爲不依賴於温度的常數。對所測天然橡膠估計所得的粘流鰱段長約30個碳原子。 3.從粘性流動的切變速率dγ/dt依賴於切應力σ的關係中,獲得了Eisenschitz早已衍導出的,但迄未在高聚物的本體粘性流動中獲得例證时非牛頓流動流公式。該式復以Saunder及Treloar的數據重加處理而證實之。 4.從切變速率對貌似本體粘度的影響上,檢驗了Debye-Bueche的理論式。現改用單位體積內彈性鍵段計算推遲時間,τ_1=2.84η_0·[J_e]∞,其中穩態彈性柔數[J_e]∞。係由彈性同復實驗測得。經如此處理後,該式在較低切變速率時筒能與實驗結果相符。 5.若以Eisenschitz式與Debye-Bueche式相結合,則亦可計得內切模數G_i,並藉...

1.本實驗採用了Hoeppler平行板塑性計,按照定應力壓縮形變法的理論,在中温時對國產天然橡膠的本體粘性流動進行了流變學研究。 2.在30-90°與250-1500克/厘米~2的荷重範圍內,測定了貌似本體粘度η_a,內切模數G_i與貌似活化能ΔE_η。所測得的G_i=3.30×10~5達因/厘米~2與ΔE_η=12.7千卡/克分子,在一定温度範圍(50-90°)內爲不依賴於温度的常數。對所測天然橡膠估計所得的粘流鰱段長約30個碳原子。 3.從粘性流動的切變速率dγ/dt依賴於切應力σ的關係中,獲得了Eisenschitz早已衍導出的,但迄未在高聚物的本體粘性流動中獲得例證时非牛頓流動流公式。該式復以Saunder及Treloar的數據重加處理而證實之。 4.從切變速率對貌似本體粘度的影響上,檢驗了Debye-Bueche的理論式。現改用單位體積內彈性鍵段計算推遲時間,τ_1=2.84η_0·[J_e]∞,其中穩態彈性柔數[J_e]∞。係由彈性同復實驗測得。經如此處理後,該式在較低切變速率時筒能與實驗結果相符。 5.若以Eisenschitz式與Debye-Bueche式相結合,則亦可計得內切模數G_i,並藉知貌似本體粘度隨切變速率增高而降低的現象,乃係由於發生內切應變γ_i=σ/G_i之故。

 
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