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     In the technique developed the stationary phase used is diol bonded silica silica SI-200A, which is synthsized in this laboratory; the mobile phase is methanol/0. 05mol/l-NaH_2PO_4(40/60 by volume); the detector is of UV 213 type.
     该方法以SI-200二烃基键合相为固定相,以甲醇/0.05mol/l的NaH2PO4(体积比40/60)为流动相,使用UV检测器在213nm处检测。
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     the transparency and scattering property of the material could be changed by changing the PS content and MMA/St ratio; when the PS content was 0.2%~0.3%,MMA/St=3:2 or 1:1 (by volume),the material had balanced scattering and transmitting properties.
     改变PS用量以及MMA和St两种单体组成比,可以调节材料的透明性和散射性,当PS用量为0.2%~0.3%,MMA/St=3∶2或1∶1(体积比)时,材料具有均衡的散射性和透明性。
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     The optimumcomposition of TBP in extraction system is 6% by volume.
     研究结果表明:该萃取体系中TBP的最佳含量(体积分数)为6%;
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     The critical concentrations of chitosan in solvents of dichloroacetic acid,formic acid,acrylic acid and 36% acetic acid were all 8% (percentage by volume) or 4%~6%(percentage by weight). These experimental values are consistent with the calculated value deduced according to Flory theory.
     在二氯乙酸、甲酸、丙烯酸和36%乙酸等溶剂中测得的临界浓度都是8%(体积比)或4%~6%(重量比),与根据Flory理论得到的计算值相符。
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     When ethanol concentration of the solvent reaches 50% by volume ratio,the reduced viscosity of the solution becomes the maximum and the electron spin resonance (ESR) spectrum parameters g ∥ and A ∥ reach their maximum and minimum respectively. Due to the largest charge density in the complex chain,the macromolecular chain is extended,presenting an expanded conformation and a poor catalytic activity in oxidation of hydroquinone.
     当乙醇含量为50%(体积比)时,溶液的比浓粘度最大,其电子自旋共振(ESR)波谱参数g∥值最大,A∥值最小,络合物链上的电荷密度最高,因而大分子链比较伸展,呈扩张构象,致使催化氢醌(H2Q)氧化活性最小。
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     Under the reaction conditions of 120,5.0MPa(CO/H2=l),P/Rh=4,l-decene/Rh=1000 and reacted for 5h,the conversion of 1-decene and the yield of aldehyde are 99.5% and 99.0% respectively.
     结果表明,在S/Rh=1000,P/Rh=4,120℃,5.0MPa(体积比CO/H_2=1)及反应时间为5h的条件下,1-癸烯转化率和醛收率分别可达99.5%和99.0%,TOF为198h~(-1),产物正异比为 0.62。
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     H2SO4: H3PO4 (V/V) = 5: 1 ; and the reflux time is 2 hours.
     H2SO4:H3PO4=5:1(体积比),回流时间2h。
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     The spinel LiMn2O4 was synthesized at 750℃ by reacting EMD with LiCO3. The experimental results showed that this kind of materials had an excellent charging-discharging performance in the electrolyte 1mol/L LiCIO4 + PC/DME (1: 1 volume ratio).
     实验采用EMD与Li2CO3为原料,在750℃下合成尖晶石型LiMn2O4实验结果表明,该材料在1mol/LLiClO4+PC/DME(体积比1:1)电解液中表现出优良的充、放电性能。
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     The enhanced hardness reaches the maximum HK32.25GPa when TiN∶AlN≈1∶1.
     薄膜总体表现出硬度增强效果,在TiN∶AlN(体积比)≈1∶1时,薄膜硬度获得极大值HK32.25GPa.
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     The toughening mechanisms and mechanical properties of hot pressed Al 2O 3+0 20SiC w ZrO 2(0 02Y 2O 3)(ZrO 2(0.02Y))ceramic matrix composites is investigated in this paper.
     研究了热压烧结Al2O3+0.20SiCw(体积分数,下同)-ZrO2(摩尔分数为0.02Y2O3,记为ZrO2(0.02Y))陶瓷复合材料的力学性能及韧化机制。
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The measurement of pressures in shock waves by volume-type sensors
      
Nickel-polystyrene composite materials produced by the chemical deposition of nickel on polystyrene beads exhibit high conductivity at a nickel concentration of less than one percent by volume.
      
Acetonitrile and diethyl ether mixtures (10 : 4-6.5, by volume) were proposed as eluants.
      
The isotope exchange was performed at 100°C in the dioxane-triethylamine mixed solvent (9: 1 by volume).
      
The electrochemical reduction of carbonyl-containing methanofullerenes is studied by methods of cyclic voltammetry and ESR with in situ electrolysis in the environment of 0.1 M Bu4NBF4 in o-dichlorobenzene-dimethylformamide (3:1 by volume).
      
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The thermodynamic functions of an ideal subetance represented by van der Waals equation are obtained with the help of the condition that these functions reduce to those of a perfect gas in the limiting case of vanisning prassure. The volumes of the liquid state and gas state in coexistence as determined by Maxwell's rule of equal areas are expressed in a parametrie form. The nature of the dependence of the constants a and b on the chemical composition of the gas is briefly considered.

任何气体在压力极小时皆变为理想气体。今利用此点以求一凡得瓦尔气体之各种热力学函数。当气体与液体同时存在时,其由等面积法所定各自之体积,今以参数表之。最后约略言及a,b二常数与气体化学组成之关系。

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。

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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