历史查询   



 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
The interaction type can change with environmental conditions.


A peculiar dependence of equilibrium orientations of antiphase boundaries on the interaction type is predicted, and it qualitatively agrees with the available experimental data.


It is shown that the indirect interaction of pseudospins via radiation field in a twolevel optical system contains pseudospin energy components of the Ising exchangeinteraction type.


The advantages and limitations of such an interaction type for future rose breeding programmes and for markerassisted selection strategies are discussed.


This work adds a fourth type to these interactions and restates the interaction type classification and the transitions between the various interaction types.

 更多 


 Based on the triplet code model of leptons and quarks, an ansatz about the numbers of gauge fields, which is assumed to be the numbers of independent phases in the fundamental gauge transformations, is suggested. In the minimal model, the number is 18, and 3 gauge fields mediating baryon nouconservation interactions are predicted.  把轻子和夸克看作由三联密码组成的4×4×4个内禀状态。在此模型的基础上提出了关于粒子间相互作用类型的一个ansatz:规范场数等于基本规范变换中独立相角函数个数。据此,在左右不对称的理论中,规范场数为18。因而推测重子数不守恒规范粒子不是通常SU(5)理论中的12个,而是最多只有8个。对这种作用的具体形式进行了讨论。证明了不存在世代规范场。由质量破缺的一般形式出发,从S_3对称性证明第三代和一、二代间存在质量隙,并可进一步解释三代的混合和Cabibbo角。  In the experimental process dealing with the diagnosis of early carci noma by fluorescence sensitizatioh method,we observed several biologic macromolecules which possess the sensitization effect to the fluorescence of the derivatives of hematoporphyrin (HPD). By means of isolated simulate experiment, the energy transmission between bovine albumin (BALB) and HPD has been confirmed, the energy donor was BALB and the energy recipient was HPD. The transmission efficiency has been evaluated and the types of interaction... In the experimental process dealing with the diagnosis of early carci noma by fluorescence sensitizatioh method,we observed several biologic macromolecules which possess the sensitization effect to the fluorescence of the derivatives of hematoporphyrin (HPD). By means of isolated simulate experiment, the energy transmission between bovine albumin (BALB) and HPD has been confirmed, the energy donor was BALB and the energy recipient was HPD. The transmission efficiency has been evaluated and the types of interaction between BALB and HPD were discussed.1. Energy transmission between BALB and HPDThe B type protein of the queous solution of BALB has a relatively strong optical absorption at 280nm. Under room temperature, using violet light of 230nm to excite BALB, the emission peak was 350nm and its width was 66nm. The aqueous sol. of HPD has a strong absorption band at 380nm, its width was 58nm. There was a good photospectrum overlapping between them. If we add HPD of various concentrations into BALB sol. (with constant conc.) to make fluorescence spectrum, the emission of BALB reduced profoundly while the fluorescence intensity Increased markedly (about twice that of the original sol). This suggested that the sensitization effect of BALB to HPD is rather eminent. From the measurement cf the sudden disappearance of the fluorescence of the energy BALB donor, the following formula may be used to estimate the transmission efficiency between BALB and HPD.( 1 )When the concentration of HPD is 4.2×103M and that of the BALB is 1×15M, W = 0.57.2. Types of interaction between BALB and HPDWe selected several photosensitive experiments of various concentrations of HPD and found that within a given range of concentration the increase in conc, of HPD will cause a reduction in the reaction distance between donor and recipient and a marked decline of the luminescence of BALB. The energy transmission efficiency between BALB and HPD is strengthened, and is basically fulfilled the criteria of Forster formula:(2)Therefore, it is considered that the interaction between BALB and HPD is the interaction between even poles.  首次报导了蛋白质分子对血卟啉衍生物分子之间的荧光敏化现象。通过离体模拟实验,证实了牛血清白蛋白分子(Bovine albumin) (BALB)与血卟啉衍生物分子(HPD)之间存在着能量转移,其中能量供体为BALB,能量受体为(HPD)。估算了其转移效率,讨论了BALB与HFD之间的相互作用类型。  In order to study energy transfer by means of cw excitation, concentrationdependence of fluorescence intensity of sensitizer is discussed in this paper.The stationary fluorescence intensity Is of sensitizer is proportional to yF(0),where y is the intrinsic time constant of sensitizer, F(p) =K(p)e(p), K(p)isthe fluorescence transfer function, and e(p) is the Laplace transformation ofthe input energy e(t) received by the sample. Obviously, e(p) is related both to the excitation processes and to the sensitizer... In order to study energy transfer by means of cw excitation, concentrationdependence of fluorescence intensity of sensitizer is discussed in this paper.The stationary fluorescence intensity Is of sensitizer is proportional to yF(0),where y is the intrinsic time constant of sensitizer, F(p) =K(p)e(p), K(p)isthe fluorescence transfer function, and e(p) is the Laplace transformation ofthe input energy e(t) received by the sample. Obviously, e(p) is related both to the excitation processes and to the sensitizer concentration.For optically excited thin samples, e(p) is proportional to Cs. Sensitizer fluorescence intensity might be calculated according to eqs.( 1 ) or (2). In section II,the fs CA dependence is discussed for static transfer caused by electric multiple inteiaction, while IsCs dependence is discussed for hopping transfer with incorrelated S  S and S  A transfer rates and for concentration quenching, where SS transfer rate is proportional to that of SA transfer. The results show that as Cs is low enough,Is Cs holds for all kinds of energy transfer processes. The slop of the ISC curve in loglog plot at the points where C is high enough reflects the mechanisms of SS and SA interactions.. For ISCA curve of static transfer, this slop is CAs/di. For IsCS curve of hopping transfei, it is 1+r/sr/d, where s, r are the electric multiple indices of SA and SS interactions, d is the dimension of the system. In concentration quenching, it is 1  s/d for electric multiple interaction and zero for exchange interaction. Hence the interaction mechanism may be deduced from the ISCA and/or JsCS curves.The optimum concentration for the highest brightness in a material with concentration quenching may be calculated from energy transfer parameters, as shown in eq. (12), which is derived from the point of intersection of the two asymptotes of the loglog ploted IC curve for large and small C.If the sample is not optically thin, eqs. (1) and (2) must be revised as (1') and (2'). For optically excited thick sample, especially, the above mentioned slop is that of the corresponding thin sample minus 1.  本文研究了连续光激发下能量传递中敏化剂发光强度与浓度的关系。指出,可以通过双对数坐标中发光强度与浓度的关系曲线在浓度足够大时的斜率确定敏化剂间及敏化剂与激活剂间相互作用的类型。讨论了有浓度猝灭时亮度最高的掺杂浓度与能量传递参数的关系以及样品厚度对测量结果的影响。   << 更多相关文摘 
相关查询  



