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非稳态相
相关语句
  nonstationary phase
     Prestack depth migration by nonstationary phase shift method
     非稳态相移法叠前深度偏移
短句来源
     The paper introduces a prestack depth migration by nonstationary phase shift method suitable for laterally variable velocity.
     介绍一种能够适应介质速度横向变化的非稳态相移算子及其叠前深度偏移方法.
短句来源
     For the sake of computation cost, prestack depth migration by nonstationary phase shift is implemented using a piecewise constant approximation, the migrated Marmousi result shows that the nonstationary phase shift migration for heterogenous media is feasible.
     为了提高运算速度,基于非稳态相移算子的叠前深度偏移算法采取了分片均匀近似的策略,Marmousi模型的叠前深度偏移结果证明了该算法的可行性和有效性.
短句来源
  “非稳态相”译为未确定词的双语例句
     A generalized high order screen extrapolator of double square root (DSR) equation is derived from the non-stationary phase shift formula of wavefield continuation, thus a new prestack depth migration method in the cmp-offset domain is proposed.
     在波场延拓方面,从非稳态相移公式出发,推导出广义高阶屏双平方根波场延拓公式,从而得出了一种新的共中心点-炮检距域叠前深度偏移方法。
短句来源
     Based on non station ary phase shift formula for wave field extrapolation and through introducing re ference velocity,the paper deduced a new high order screen approximate formula conducted wave field continuation in CMP offset domain,using Taylor's series ex tension for two square roots in DSR and suitable mathematical process.
     本文基于波场延拓的非稳态相移公式,通过引入参考速度,并对双平方根项中的两个平方根项作泰勒级数展开,经过适当的数学推导,得出了共中心点—炮检距域波场延拓的双平方根非稳态相移新的高阶屏近似公式。
短句来源
     Conventional phase shift operator requires that the velocity be laterally constant, while nonstaionary phase shift operators such as PSPI, NSPS SNPS overcome the shortcoming. The symmetric SNPS operator, a combination of NSPS and PSPI, has better accuracy and stability than NSPS or PSPI.
     为了克服常规相移偏移算法中要求速度横向不变的缺点,出现了基于非稳态滤波器理论的非稳态相移算子,即PSPI算子、NSPS算子和SNPS算子,其中SNPS算子是将前二者结合起来的一种对称的非稳态相移算子,它比前二者具有更高的精度和稳定性.
短句来源
  相似匹配句对
     Unsteady State Simulation of Distillation Process
     精馏过程的稳态模拟
短句来源
     Theory of Non--Steady Electrostatic Precipitation
     稳态静电收集理论
短句来源
     Numerical Analysis of Non-steady Heat Transfer Problem with Phase Change in an Annular Cavity
     圆环腔内有稳态传热的数值分析
短句来源
     Prestack depth migration by nonstationary phase shift method
     稳态移法叠前深度偏移
短句来源
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  nonstationary phase
Nonstationary phase flow and rectification acceleration in industrial plant
      
Nonstationary phase processes are defined and a surrogate distribution approximation (SDA) method for analyzing transient and nonstationary queueing systems with nonstationary phase arrival processes is presented.
      
Applying the split-step technique to the solutions of nonstationary phase-shift leads to the three split-step Fourier schemes.
      
It speeds up the original nonstationary phase-shift but retains accuracy.
      
The windowed nonstationary phase-shift method presented in this paper can handle wavefield extrapolation in strong laterally variant velocity media.
      
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A kinetic approach to phase transition of liquid crystalline polymers was deduced. On the basis of physical chemistry, a kinetic equation concerned the phase transition of liquid crystalline polymers was established, and a new kinetic parameter of transition order was proposed. Hence the quantitative determination of the order of phase transition was obtained. In addition, the kinetic approach was applied to a new series of polymer systems, and the kinetic order of phase transition of the polymers was decided.It...

A kinetic approach to phase transition of liquid crystalline polymers was deduced. On the basis of physical chemistry, a kinetic equation concerned the phase transition of liquid crystalline polymers was established, and a new kinetic parameter of transition order was proposed. Hence the quantitative determination of the order of phase transition was obtained. In addition, the kinetic approach was applied to a new series of polymer systems, and the kinetic order of phase transition of the polymers was decided.It is concluded that the clearing transition is of first order, and the smectic-smectic transition second order, while the order of melting and solid-solid transition varies with the polymer structure.

本文以保留系统的宏观特性为基本原则,从用动力学方法处理非稳态相转变入手,在物理化学基础上,建立了描述液晶相转变的动力学方程,提出了动力学意义上的相转变级数参数,推导出相转变级数的理论公式及参数的变化范围,丹卉将其应用于一新的聚合物体系,获得了该体系各聚合物加热过程中所经历相态的动力学相转变级数。

In this paper,4 methacryloyl 2,2,6,6 tetramethyl piperidine(MTMP)was synthesized.By using Photo DSC technique,the reactivity and the reaction kinetics of photo induced polymerization of MTMP were systematically studied.Results obtained have showed that the photo induced polymerization of MTMP is significantly influenced by such reaction conditions as the type and concentration of photoinitiator,polymerization temperature,ambient environment as well as irradiancy,and that the rate of photopolymerization...

In this paper,4 methacryloyl 2,2,6,6 tetramethyl piperidine(MTMP)was synthesized.By using Photo DSC technique,the reactivity and the reaction kinetics of photo induced polymerization of MTMP were systematically studied.Results obtained have showed that the photo induced polymerization of MTMP is significantly influenced by such reaction conditions as the type and concentration of photoinitiator,polymerization temperature,ambient environment as well as irradiancy,and that the rate of photopolymerization of MTMP is directly proportional to the square root of photoinitiator concentration([PI] 0 5 ) and incident light intensity(I 0 0 5 ),which is in accordance with the theoretical expectation.The kinetic parameters( k p and k t )of the bulk photopolymerization of MTMP have been determined by Photo DSC.The rate of propagation constant k p and the rate of termination constant k t have been found to be increased with the increase of MTMP conversion,but is much larger than k p .

以可聚合型受阻胺哌啶醇衍生物 4- (甲基丙烯酰氧基 ) - 2 ,2 ,6,6-四甲基哌啶醇酯( MTMP)作为单体 ,利用光差动热分析法 ( DPC)系统地研究了 MTMP的光聚合反应活性和反应动力学规律 .结果表明 :反应条件如光引发剂的种类及浓度、聚合温度、气氛和辐照光强等对 MTMP光聚合动力学有显著的影响 ;在反应初期 MTMP光聚合速率同引发剂浓度和辐照光强的平方根成正比 ,这一规律与光引发自由基聚合的动力学理论相吻合 ;利用稳态法和非稳态相结合的方法测定了光聚合过程的动力学常数 ( kp 和 kt) .随着转化率的增加 ,MTMP的链增长速率 ( kp)和链终止速率 ( kt)均呈现增加态势 ,但 kp 增加的幅度大于 kt

4-acrylamido-2,2,6,6-tetramethyl-piperidine(AATP),a water soluble r-HALS,is synthesized and the structure and composition of AATP is characterized by FT-IR,~1H-NMR and elemental analysis.The reaction kinetics of photoinduced bulk polymerization of AATP in melting state is studied by using photo-DSC (DPC) technique.The results show that the conversion and the rate of AATP photopolymerization are obviously affected by the reaction condition such as temperature,incident light intensity and concentration of photoinitiator...

4-acrylamido-2,2,6,6-tetramethyl-piperidine(AATP),a water soluble r-HALS,is synthesized and the structure and composition of AATP is characterized by FT-IR,~1H-NMR and elemental analysis.The reaction kinetics of photoinduced bulk polymerization of AATP in melting state is studied by using photo-DSC (DPC) technique.The results show that the conversion and the rate of AATP photopolymerization are obviously affected by the reaction condition such as temperature,incident light intensity and concentration of photoinitiator etc.Darocur 1173 is the available initiator and the optimum mass fraction of Darocur 1173 is 0.5—1.0 %.The rate of AATP photopolymerization is proportional to the square root of photoinitiator concentration c~(0.5)_(PI) and incident light intensity I~(0.5)_0 respectively under given condition.The kinetic parameters of photoinduced bulk polymerization for AATP were measured at the steady and non-steady state.The rate constants for termination k_t is much larger than that for propagation k_p(k_p/k_t=3.43—33.57).k_t and k_t is increased with the conversion increasing in the reaction system.k_p and k_t is 2.22—7.96×10~2 and 0.08—2.67×10~4(L/mol·s) corresponding to a conversion from 4.00% to 15.68%,respectively.These values are within the range of corresponding parameters typical for a free radical polymerization.The induction period of the reaction system is decreased with the increment of photoinitiator concentration and incident light intensity respectively.Because of apparent activation energy of the reaction system is negative [E_p-E_t/2 is from -7.70 to -13.36 kJ/mol] and A_p/A_t~(0.5) is from 0.076 to 0.333(L/mol·s)~(0.5),the rate of AATP photopolymerization is decreased with increment of the temperature from 110 ℃ to 150 ℃ and the irradiating time of that is prolonged.

合成了反应型受阻胺4 丙烯酰胺基 2,2,6,6 四甲基哌啶(AATP),用FTIR、1H NMR和元素分析对其结构和组成进行了综合表征.以AATP为聚合单体,利用光 DSC技术研究了AATP熔融本体光聚合反应动力学.结果表明:AATP光聚合的诱导时间随引发剂浓度和辐照光强增加而缩短,光聚合速率随温度的升高而减小;在聚合初期,AATP光聚合速率分别与引发剂浓度和辐照光强的平方根呈较好的线性增长关系.并用稳态和非稳态相结合的光 DSC方法测定了AATP光聚合过程的动力学参数:链增长速率常数kp=2.22—7.96×102L/mol·s、链终止速率常数kt=0.08—2.67×104L/mol·s、表观活化能为Ep-Et/2=-7.70—-13.36kJ/mol、指前因子Ap/At0.5=0.076—0.333(L/mol·s)0.5,kp和kt在聚合初期均随单体转化率的提高而增大,但kt增加的幅度远大于kp.

 
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