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critical distance     
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  临界距离
     Various local fatigue criteria for fatigue assessment are developed in recent years,such as notch stress intensity factor (N SIF),equivalent stress intensity factor (E SIF),critical distance method (CMD) which includes point method (PM),line method (LM) and area method (AM),critical plane method (CPM) and volumetric method (VM).
     目前已提出了多种焊接接头疲劳评定的局部准则 ,如缺口应力强度因子法 (N -SIF)、等效应力强度因子法 (E -SIF)、临界距离法 (CDM)包括点 (PM)、线 (LM)和面 (AM)法、临界面法及体积法。
短句来源
     On increasing SrAl12O19 content, the critical distance R0 for energy transfer R0 decreased, from R0 = 4.0A for x = 0 to 3.6 A for x = 0.4. When x reached 0.8, however, the energy transfer no longer occurred.
     随着固溶体中SrAl_(12)O_(19)含量的增加,Mn~(2+)(g)-Mn~(2+)(r)能量传递几率降低,临界距离R_0减小。 当x=0.8时,Mn~(2+)(g)-Mn~(2+)(r)传递消失。
短句来源
     Inside the critical distance, the ratio of the stress to peak stress only depends on the notches' radius.
     临界距离内的应力与最大应力之比只同缺口半径有关,而与结构绝对尺寸无关。
短句来源
     Kinetic analysis shows that the critical distance of energy transfer equals 52.0 A, and the rate constant of this process is 290 1.mol-1.s-1. It is proved that energy is transferred by a mechanism of long range resonance.
     用测定尼龙丝的燐光寿命随染料浓度变化的方法对此过程作动力学研究,测得能量转移速度常数k_t=2901·mol~(-1)·s~(-1),能量转移的临界距离R_0=52.0(?)
短句来源
     The critical distance R_0 for which concentration quenching will happen, and the interaction microparameter C_ Er-Er in tellurite glasses were determined on the basis of the energy migration model of Dexter theory. The value of C_ Er-Er in the proposed tellurite glass was compared with that in other glass hosts.
     根据Dexter能量转移理论计算了Er3+在碲酸盐玻璃中发生浓度猝灭的临界距离R0及Er3+间相互作用参数CEr-Er,并与其他基质玻璃中CEr-Er数值进行了比较.
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  危险距离
     Examples of troubleshooting of the electric system of DAIMLER-BENZ S320 are introduced from the following four aspects:malfunctions of the critical distance indicator lamp of the anti-collision system;
     从4方面对奔驰S320轿车电气故障排除实例进行了介绍:一是防撞系统危险距离指示灯的故障;
短句来源
  “critical distance”译为未确定词的双语例句
     The critical distance R0 between provider and acceptor, when energy transfer efficiency is 50%, is about R0=1.81×10-7 cm. The energy transfer efficiency between Levofloxacin and BSA is E = 0.351. According to these calculation results, it could be known the combined position between the binding site of Levofloxacin and the tryptophane of BSA is about r=2.01×10-7 cm.
     利复星的能量转移效率为50%时给体和受体之间距离的 R0=1.81×10-7cm,利复星和牛血清白蛋白的能量转移效率为E=0.351,根据这些计算结果可以知道利复星和牛血清白蛋白的色氨酸残基的结合位置为r=2.01×10-7cm。
短句来源
     The energy transfer from Mn~(2+) (green) to Mn~(2+) (red) occurs in high Mn~(2+)concentration (X≥0.4). The critical distance for energy transfer is about 0.4 nm.
     Mn~(2+)(绿色)-Mn~(2+)(红色)间发生能量传递。
短句来源
     The main conclusions are remarked as follows:1 For strong-over-soft two-layered clay, there is a relative critical distance H_(cr)—0.5D. When H>H_(cr), the strength of upper layer has no effect on the capacity;
     1、对于上强下弱型的双层粘土,存在一个相对临界埋深,H_(cr),大约为0.5D,当相对埋深大于临界值时,承载力系数,Nc,不受上层土强度的影响,这个临界值与强度比无关;
短句来源
     Calculation method for critical distance of tunneling engineering exploded to collapse by charge explosion
     装药爆炸临界震塌爆距的计算分析
短句来源
     AbstractBy way of comparing and analysing foreign specifications and the achievement studied by domestic and overseas scholars,it gives the range of the group action of pile's critical distance,and put forward the principle of value determination.
     通过对国外规范和国内外学者研究成果的比较分析,给出了群桩效应临界桩距的取值范围,并提出了取值的原则。
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  critical distance
A semiquantitative model predicts the applied potential dependence of da/dtII using reasonable input parameters, particularly crack-tip H uptake reverse calculated from measured KTH and a realistic critical distance.
      
A strain-controlled micromechanical model accurately predicts KJICi as a function of temperature, but includes a critical distance parameter (l*) that is not definable a priori.
      
In analyzing these results, phenomenological fracture initiation models were adopted based on the requirement that, for fracture to occur, a critical strain or stress must be achieved over a critical distance.
      
The critical distance depends on the size distribution and volume fraction of carbides.
      
It is found that the frequency with which the critical distance between adjacent atoms is attained ceases to be dependent on the number of atoms for very long molecules with any boundary conditions.
      
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The delayed fluorescence of 1-amino-4-hydroxy-anthraquinone is observed in the phosphorescence spectrum of dyed nylon-6 fiber. This indicates that energy transfer occurs between polymer (impurity groups) and the dye. Kinetic analysis shows that the critical distance of energy transfer equals 52.0 A, and the rate constant of this process is 290 1.mol-1.s-1. It is proved that energy is transferred by a mechanism of long range resonance. After being irradiated, the dyed nylon fiber shows less strength loss...

The delayed fluorescence of 1-amino-4-hydroxy-anthraquinone is observed in the phosphorescence spectrum of dyed nylon-6 fiber. This indicates that energy transfer occurs between polymer (impurity groups) and the dye. Kinetic analysis shows that the critical distance of energy transfer equals 52.0 A, and the rate constant of this process is 290 1.mol-1.s-1. It is proved that energy is transferred by a mechanism of long range resonance. After being irradiated, the dyed nylon fiber shows less strength loss than the undyed ones, which means the dye functions as a kind of photostabilizer.

在研究用染料1-氨基-4-羟基蒽醌染色的尼龙-6单丝的燐光光谱时,观察到染料的延迟荧光。这表明在这一体系中发生了聚合物的杂质基团与染料间的能量转移。用测定尼龙丝的燐光寿命随染料浓度变化的方法对此过程作动力学研究,测得能量转移速度常数k_t=2901·mol~(-1)·s~(-1),能量转移的临界距离R_0=52.0(?),并证明该过程是以三线态-单线态的远程共振机理进行的,染料淬灭了尼龙-6中有害的杂质基团激发三线态,从而起到了光稳定化的作用。

Several bischromophore compounds 2-(ω-biphenylyl polymethylene)-5-biphenylyl oxadiazole-l,3,4(F1-(CH2) n-F2), compounds 1,2,3,4 respectively n = l,2,3,4, and the corresponding model compound 2-methyl-5-bi-phenylyl oxadiazole-1,3,4 (compound 5) have been synthesized. The intramc lecular energy transfer has been studied by fluorescence emission spectra.The fluorescence spectra of biphenyl, compound 5, the 1:1 mixture of compound 5 with biphenyl as well as compounds 1 to 4 have been determined. The spectrum data...

Several bischromophore compounds 2-(ω-biphenylyl polymethylene)-5-biphenylyl oxadiazole-l,3,4(F1-(CH2) n-F2), compounds 1,2,3,4 respectively n = l,2,3,4, and the corresponding model compound 2-methyl-5-bi-phenylyl oxadiazole-1,3,4 (compound 5) have been synthesized. The intramc lecular energy transfer has been studied by fluorescence emission spectra.The fluorescence spectra of biphenyl, compound 5, the 1:1 mixture of compound 5 with biphenyl as well as compounds 1 to 4 have been determined. The spectrum data are listed in the table.Table From the table, it is that the bischromophore compounds 1 to 4 are excited at 245 nm, their range of fluorescence peak are broader than the mixtures'. The intensity of fluorescence spectra is increased. These phenomena are obviousty the results of intermolecular energy transfer.According to Forster's viewpoint, the rate constant for dipole dipole energy transfer between a donor D and an acceptor A, i.e. kD→A is given by where R0 is the critical distance between the donor and the acceptor.From eq. ( 1 ), the rate constant of energy transfer is connected with the distance R. The less the value of R the larger the rate constant of energy transfer will be. Because of a negative sixth-power dependence of kD→A on R, a change in. R by just a few angstorms makes a large change in kD→A.According to the molecular structures of the compounds the distance between the donor and the acceptor in compounds 1 to 4 may differ from each other in order of:R1

本文对双荧光团化合物2-(ω-联苯基取代多亚甲基)-5-联苯基恶二唑—1、3、4,及其对应的模型化合物2-甲基-5-联基恶二唑,通过测定荧光光谱的方法,对分子内给体与受体之间的能量转移进行了研究,从实验结果初步得到了双荧光团化合物比相应的单荧光团化合物混合体系的能量转移速率高,荧光强度有明显的提高。并从化合物的结构上对给体与受体之间的距离对能量转移速率常数的影响作了初步探讨。

The generalized head waves from two different 2-D models including respectively one high velocity thin layer were studied by using ultrasonic experiment technique, SYC-2 or SYC-3 ultrasonic units were used as transmitter and receiver, The used materials of models are aerated plastic, plastic, organic glass and aluminium; the plates of the models are 6mm in thickness and above 1200mm in length. The experiments show that in this condition, we can detect not only the first arriving head waves resulting from critical...

The generalized head waves from two different 2-D models including respectively one high velocity thin layer were studied by using ultrasonic experiment technique, SYC-2 or SYC-3 ultrasonic units were used as transmitter and receiver, The used materials of models are aerated plastic, plastic, organic glass and aluminium; the plates of the models are 6mm in thickness and above 1200mm in length. The experiments show that in this condition, we can detect not only the first arriving head waves resulting from critical incident wave but also that resulting from noncritical incident waves. The latter ones are called the generalized head waves, and don't follow Snell's law in propagation. Furthermore, there also occur a set of symmetric downgoing head waves. The maximum amplitude of generalized head waves does not appear at critical position but at half critical distance outside the critical position. A analytic function can be derived to fit the observed amplitude value curve. The existence of generalized head wave in noncritical condition fully proves that head wave propagates in the form of spacial energy flow on its incident, refractive and lateral raypaths. The energy flow density peaks around the point at which the amplitude of generalized head wave is maximum, then it decreases rapidly with the increase of the distance to this point. The kinematic and dynamic characteristics of downgoing head wave is similar to that of generalized head wave. The downgoing head wave causes complexity in wavefield research. This lab research result is significant to probing into the dynamic characters of phase of seismic wave generated by explosion.

利用超声实验技术,对含高速薄层的两类不同形状的二维模型所产生的广义首波进行了研究。发射和接收装置采用SYC-2或SYC-3型超声仪,模型材料采用泡沫塑料、塑料、有机玻璃和铝,模型板厚度均为6mm,长度大于1200mm。实验表明,在此条件下,不仅能够观测到临界角射线形成的初至首波,也能观测到非临界角射线形成的初至首波,这种初至首波称为广义首波,它的传播不遵守斯奈尔(Snell)定律。与此相应,在高速薄层中还存在一组反向对称的下行首波。广义首波的最大振幅点不出现在临界点上,而是偏离临界点外侧约等于临界距离一半的位置上。根据观测振幅曲线,可以求出拟合此观测值的解析函数。非临界条件下广义首波的存在,表明首波在其入射、折射和侧向传播的路径上,将以具有一定空间的能流形式出现。在广义首波振幅最大点附近,能流密度最大,随着偏离此点的距离加大,能流密度迅速减小。下行首波的运动学和动力学特点与广义首波十分相似。但是,下行首波的存在给波场的研究带来新的复杂性。上述实验结果对研究由爆炸激发的地震记录震相的动力学特征是有意义的。

 
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