So it can be used as both sensor component and driving component . pzt have better electromechanical coupling coefficient , piezoelectric constant , mechanical quality factor , curie temperature and stability , etc . so , pzt can be used widely in smart materials and structure 与其它压电陶瓷相比,锆钛酸压电陶瓷( pzt )有较好的机电耦合系数、压电常数、机械品质因数、居里温度和稳定性等,因此, pzt能广泛应用于智能材料结构中。
The property of the entanglement is also studied and it is demonstrated that the amount of entanglement oscillates with time - evolution periodically and is related with the coupling coefficient and detuning . the quantum state varies between disentangled state and entangled state 具体研究这种纠缠态的性质得出，原子与场纠缠体系的纠缠度随时间周期振荡，并且和原子与场间的耦合系数及失谐程度有关，量子态在非纠缠态与纠缠态之间变化。
The third , synchronization in unidirectionally coupled 4 - order hyperchaotic chua ' s circuits is studied . synchronization of hyperchaotic systems can be achieved using only one variable unidirectionally coupled at discrete times . we obtain the threshold of couple coefficient based on lyapunov stability theory 第三，采用单向耦合方法实现了两个四阶蔡氏超混沌电路的同步，根据lyapunov稳定性定理，得到了两个系统达到同步时耦合系数的阈值。
In this work , the transmitting characteristics of transformer on various kinds of loads were investigated , and an oil - filled compact pulse transformer was designed . from experiments , the parameters with primary inductance 2 . 578 , h , secondary inductance 167 . 710uh , and coupling coefficient 0 . 7238 were obtained 7238 、直径20cm 、长50cm （外壳） 、耐压300kv的紧凑型空心脉冲变压器，并在此变压器上进行了大量的实验，得到了实验与理论分析相一致的结果。
4 . the dipole squeezing of a a - type three - level atom interacting with a strong coherent field in a high - q kerr cavity is investigated . the effects of the kerr medium , the field - atom coupling coefficient and the detuning on the atomic dipole squeezing are discussed by numerical calculation 4 .研究了充满高qkerr介质腔内强相干光场与a型三能级原子相互作用中原子的偶极压缩效应，着重讨论了kerr介质、原子与光场间的藕合系数以及失谐量对原子偶极压缩的影响。
In the end , the part - magnetic - core pulse transformer is constructed with primary inductance 3 . 14 h , second inductance 298 . 89 h and coupling coefficient 0 . 873 . compared with the air - core spiral strip pulse transformer of the same dimension , the coupling coefficient is increased by 13 . 4 percent . this transformer is used to charge for water capacitor 最终研制的部分磁芯带绕式脉冲变压器的初级电感为3 . 14 h ,次级电感为298 . 9 h ,次级输出电压在635kv以上,耦合系数为0 . 87 ,比相同结构尺寸的带绕式空芯脉冲变压器的耦合系数提高了13 . 4 % ,变比提高了20 % ,能量传输效率提高44 % 。
The physical meaning for each of the term in the coupling coefficient is stated . in particular , we advance firstly ( as far as our knowledge ) , that the birefringence can cause additional coupling for the directional coupler . then , taking the ti - diffused linbo3 directional coupler and the ti - diffused linbo3 with gradient refractive index for examples , we make the numerical simulation for the coupling coefficient or the propagation constant , which prove that the birefringence has played a crucial effect on the propagation constant and the coupling between the modes that we can not neglect 第二，我们推导出了弱导近似下各向异性光波导在任意微扰下的非正交耦合模理论，得到了物理意义鲜明的耦合波方程和耦合系数表达式，指明了耦合系数所包含的四项各自的物理意义及在不同条件下的取舍，首次提出在方向耦合器中双折射将引起附加的耦合，并以钛扩散铌酸锂方向耦合器和折射率渐变分布的钛扩散铌酸锂矩形波导为例对耦合系数进行了数值模拟，充分体现了双折射项对传播常数的影响。
A novel parallel - serial type cttfc ( combined two - transistor forward converter ) with coupled inductor is present in this paper , and the performance of three parallel - serial type cttfcs is studied and compared . the performance of cttfc with coupled inductor is similar to the other two cttfcs while coupling coefficient is less than one and the converter working ccm ( continuous current mode ) , and input - to - output voltage gain increase one times while coupling coefficient is one 本文提出了一种耦合电感并?串型双管正激组合变换器，并对三种并?串型组合变换器的特性作了比较：耦合系数小于1且耦合线圈电流连续时，三种并?串型组合变换器特性相类似：耦合系数为1时，组合变换器输入输出电压增益增大一倍。
To illustrate the superiority of this type of transition , the author adapted the local normal mode ( lnm ) based on couple - mode theory to explain the coupling between two lowest order modes along the transition . for the two important parameters , propagation constants difference between the two modes apy and mode coupling coefficient cy , which denoting power coupling between lnms , the approximation expressions using structure parameters were worked out . then the author compared three typical different transitions according to the demanding of power coupling , at last concluded that the parabolic - type transition can transport the light in shortest length with lowest loss 对于表征局部标准模之间功率耦合的两个重要的参数_ ( ij ) (模式传播常数差)和c _ ( ij ) (模式耦合系数) ，推导了用器件结构参数表达的近似公式，然后根据功率耦合的需求，在常见的三种不同轮廓的过渡区之间进行了比较，得出了抛物形轮廓过渡区能够使光束在最短尺寸内以最低损耗通过波导的结论。
Tantalum lithium ( litao3 ) , a novel single crystal material , developed and industrialized with the development of communication and information industries recently , owns the excellent performances such as high mechanical - electrical coupling coefficient , lower wear - resistance , excellent high - temperature stability , excellent high - frequency capability , etc . however , researches on tantalum lithium single crystal wafer around world are still lacking 钽酸锂是近年来随着通讯、信息产业迅速发展而开发并产业化的新型光电子材料。它具有机电耦合系数大、低损耗、高温稳定性、高频性能好等优良的压电、电光和热电性能。
