This thesis describes some work on improving the performance of lasers , which i have carried out during the past three years . follows are the main points : 1 . both littrow and littman set - up of 800nm - band external - cavity diode laser systems are studied 本论文本着追踪发展、面向应用、有所创新的原则，在改善激光器性能方面做了一些工作，主要包括： （ 1 ）对800nm波段littrow和littman结构的弱耦合可调谐外腔半导体激光器进行了实验研究。
I . e . strong coupling critical admittance and weak coupling critical admittance that affect the occurring conditions and types of commutation failures in multi - infeed hvdc system , are defined in this paper . factors which has great influence on the above two parameters , such as ac system strength 针对一个典型的多馈入直流输电系统，首次定义了影响多馈入直流输电系统中换相失败及其发生类型的两个重要参数，即强耦合临界导纳和弱耦合临界导纳。
The sea method need a much simpler description of the system and has many advantage in analysis of high frequency , high modal density and complex dynamic systems in despite of limitations of assuming that the system is conservative and light coupling 统计能量方法并不需要进行结构的详尽描述，且在分析含有高频、高模态密度的复杂系统的耦合动力学问题有一定的优势。尽管统计能量方法也存在一些局限性，如它需要结构满足保守和弱耦合条件两个基本假定。
According to the decoupling of type synthesis of mechanism and the relationship between control and error software compensation , the unsymmetrical 3 - dof translational weakly - coupled parallel mechanism for cmm was selected , the positive and negative solutions of mechanism position an error model were analyzed 根据机构型的解耦性与控制和误差软件补偿的关系，选择非对称型三平移弱耦合并联机构用于坐标测量机，分析了该机构位置的正反解，建立了误差模型。
According to the theory of electromagnetic fields and temperature fields , the distribution of electromagnetic fields and temperature fields of the large salient synchronous generator with fractional stator slot are calculated and analyzed by the finite element method ( fem ) in this paper 本文根据电磁场理论，从耦合场的弱耦合角度首先计算了定子具有分数槽绕组的大型水轮发电机的电磁场，并分析了电磁场和温度场的耦合关系，进而得出电机内的温度分布。
A boson josephson junction ( bjj ) formed in a weakly coupled double - bec has been discussed intensively . based on mean - field theory ( mft ) , which gives rise to the gross - pitaevskii equation , interesting phenomena such as macroscopic quantum self - trapping ( mqst ) , and n - phase state , where the time - averaged quantum phase difference across the junction equals n have been predicted 目前由弱耦合双组分bec所构成的玻色约瑟夫森结( bjj )成为研究热点，在平均场理论基础上预言了许多有趣的现象如宏观量子自捕获( mqst ) ，和-位相态(结间量子位相差的时间平均值为) 。
Abstract : we conduct a theoretical study on the properties of a bound polaron in a quantum well under an electric field using linear combination operator and unitary transformation methods , which are valid in the whole range of electron - lo phonon coupling . the changing relations between the ground - state energy of the bound polaron in the quantum well and the coulomb bound potential , the electric field strength , and the well width are derived . the numerical results show that the ground - state energy increases with the increase of the electric field strength and the coulomb bound potential and decreases as the well width increases 文摘:采用线性组合算符及幺正变换方法研究了电场对量子阱弱耦合束缚极化子的性质的影响.推导出量子阱中束缚极化子的基态能量和库仑束缚势、电场和阱宽的变化关系.数值计算结果表明,基态能量因电场和库仑束缚势的不同而不同,随电场和库仑束缚势的增大而增大,随阱宽的增大而迅速减小
In this paper , we mainly study the global boundedness and infinity blow - up of solutions for a separate variable weakly coupled class of nonlinear reaction - diffusion system . the condition of global existence and infinity blow - up and blow - up rate are gained . in the introduction , we give a discussion about the background and general situation to the reaction - diffusion system 本篇文章主要讨论了一类反应项具有分离变量形式的弱耦合非线性扩散方程组解的整体有界和有限爆破性质，给出了整体存在和有限爆破条件并得到了有限爆破速率估计。
Though the modes of software update that we usually see are various , the principle is the same . the principle is replacing the old function modules with the new function modules , in order to convenient for the update , we should compartmentalize the function modules in the software - design phase so that every module has strong cohesion and feeble coupling 尽管我们所见的软件升级方式各异，但是它们的原理都是一样，即用新的功能模块替换原软件中旧的功能模块，因此为了便于软件升级，要求软件在开发设计的时候应该很好地划分功能模块，做到强内聚和弱耦合。
Using the formulized approach to the su ( 1 , 1 ) h ( 4 ) time - dependent system , which is derived from the combination of the formulation of the time - dependent bogoliubov transformation and the evolution equation of the system , we obtain the time evolution operator , state function and heisenberg uncertainty relation of the parametric oscillator with cavity losses under the weak coupling approximation . we also discuss the squeezing property of the system 本文利用含时波戈留波夫变换与时间演化方程相结合得到的求解su ( 1 ， 1 ) ? h ( 4 )量子系统的时间演化算符和演化态的普遍公式，我们导出了带腔损耗的参数振子在弱耦合近似下的演化算符，态函数和不确定乘积，并讨论了系统的压缩特性。
