位场

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

The key components in laser gyro is He-Ne ring laser, and the reciprocal action theory between light and medium is the base in studying the ring laser, use the Lamb half classical theory, and on the base of density matrix theory, the optical Brounch equation was established, which described the movement of amplifying medium atom in the ring syntonic cavity, and according to the medium polarize theory the self consistent equations was deduced, which describe the light intensity and phasic of the counter-propagating wave. On the basis of this equations, adopted the simulation software MATLAB and virtual instrument programming language LabWindows/CVI, we can do some simulated experiments in study the phenomenas such as amplify and dispersive characteristic of medium, mode pushing effection, burned hole effection and pattern competition, lock-in of frequency and the characteristic of light intensity and phasic of the counter-propagating wave in laser gyro.

激光陀螺的核心部件为He-Ne环形激光器，而掌握光与介质的相互作用理论是研究激光器的关键，采用拉姆半经典理论为主，在密度矩阵理论的基础上，推导环形谐振腔中描述He-Ne气体增益介质原子运动的光学布洛赫方程，运用介质极化理论得出描述激光陀螺反向行波的光强、位相所满足的自洽场方程组，在此基础上，运用MATLAB仿真软件和虚拟仪器编程语言LabWindows/CVI，对激光陀螺中的介质增益色散特性、频率牵引效应、烧孔效应及模竞争、闭锁效应及环激光的光强和相位特性进行仿真试验研究，并且运用全量子理论，对激光工作原理进行分析，得出二能级系统单模辐射场的光子数密度分布，得出激光场的光子统计分布，仿真激光场的动态建立过程。

But never was a Fight manag'd so hardily, and in such a surprizing Manner, as that which follow'd between Friday and the Bear, which gave us all (though at first we were surpriz'd and afraid for him) the greatest Diversion imaginable: As the Bear is a heavy, clumsey Creature, and does not gallop as the Wolf does, who is swift, and light; so he has two particular Qualities, which generally are the Rule of his Actions; First, As to Men, who are not his proper Prey; I say, not his proper Prey; because tho' I cannot say what excessive Hunger might do, which was now their Case, the Ground being all cover'd with Snow; but as to Men, he does not usually attempt them, unless they first attack him: On the contrary, if you meet him in the Woods, if you don't meddle with him, he won't meddle with you; but then you must take Care to be very Civil to him, and give him the Road; for he is a very nice Gentleman, he won't go a Step out of his Way for a Prince; nay, if you are really afraid, your best way is to look another Way, and keep going on; for sometimes if you stop, and stand still, and look steadily at him, he takes it for an Affront; but if you throw or toss any Thing at him, and it hits him, though it were but a bit of a Stick, as big as your Finger, he takes it for an Affront, and sets all his other Business aside to pursue his Revenge; for he will have Satisfaction in Point of Honour; that is his first Quality: The next is, That if he be once affronted, he will never leave you, Night or Day, till he has his Revenge; but follows at a good round rate, till he overtakes you.

紧接着，星期五和那只大熊之间展开了一场最大胆、最惊人的大战。这场大战起初确实使我们胆战心惊，最后却使大家开怀大笑。熊的身体笨重，行动蹒跚，跑起来当然没有狼那样轻快。因此，他的行动有两个特点。第一，对人来说，他一般不把人当作猎食的对象；当然，像现在这样大雪遍地，极端饥饿的时候，这笨拙的大家伙是否也会吃人，那就很难说了。一般来说，要是在树林里遇到熊，你不去惹它，它也不会来惹你。不过，你得特别小心，要对它客气，给它让路，因为它是一位特别难以取悦的绅士，即使是一位王子走来，它也不肯让路。如果你真的害怕，最好不要看它，继续走你的路。如果你停下来，站着正视它，熊就认为是对它的侮辱。如果你向它丢点什么东西，打中了它，哪怕是一根小小的树枝，只有你手指头那么粗，熊也认为是一种侮辱。这时，它会把一切丢开不管，一心只想报仇，不达目的决不罢休。这有关它的荣誉问题，它一定要把面子挣回来才算满足。这是熊的第一个特点。第二个特点是，熊一旦受到侮辱，就会不分昼夜地跟着你，一直到报了仇才罢休，哪怕绕上许多路，也要赶上你，抓住你。

Based on the analysis of potential vorticity and elements on isentropic surface about the typhoon 9608 and its heavy rain outside, the study is to show the PV structure and the interaction with midlatitude weather systems. It shows the feature of severe rainstorm dynamic and thermodynamic process. A picture about the process of heavy rain amplification is given.

通过对9608号台风低压及其外围暴雨位涡和等熵面上物理量场的分析，揭示了台风低压北上诱发暴雨过程的位涡场的结构及冷空气对暴雨增幅的作用，给出此次暴雨增幅过程的图像。

Finally, we present an arithmetic of multiplehypocentral, heterogenous dislocation, and a multirupture segment superposition model for simulating the earthquake deformation field. The simulated LOS interferometry map presents the distribution characteristics of the earthquake deformation field better than that of previous studied. Meanwhile, a suit of fault geometric parameters of the earthquake is also obtained by the study. Having a better effect upon simulating asymmetry, great dislocation, macro rupture field, and nonhomogeneity of dislocation than the traditional model, the multisegment method is a progress of this work. It provides a better explanation for the study on hypocentral parameters.

基于上述原因，本文对Okada线弹性位错模型的算法进行了改进，提出了"多震源、非均一位错分量、多破裂段叠加"的线弹性模型，该模型模拟出的形变场干涉纹图较好地体现了地震形变场的分布特征，并由此获得了一套较为完整的地震发震断层的几何学特征参数，为破裂带长度、破裂面方向、破裂面大小等震源破裂特征参数研究提供了较好的解释。

Finally, we present an arithmetic of multiplehypocentral, heterogenous dislocation, and a multirupture segment superposition model for simulating the earthquake deformation field. The simulated LOS interferometry map presents the distribution characteristics of the earthquake deformation field better than that of previous studied. Meanwhile, a suit of fault geometric parameters of the earthquake is also obtained by the study. Having a better effect upon simulating asymmetry, great dislocation, macro rupture field, and nonhomogeneity of dislocation than the traditional model, the multisegment method is a progress of this work. It provides a better explanation for the study on hypocentral parameters.

基于上述原因，本文对Okada线弹性位错模型的算法进行了改进，提出了&多震源、非均一位错分量、多破裂段叠加&的线弹性模型，该模型模拟出的形变场干涉纹图较好地体现了地震形变场的分布特征，并由此获得了一套较为完整的地震发震断层的几何学特征参数，为破裂带长度、破裂面方向、破裂面大小等震源破裂特征参数研究提供了较好的解释。

But few expect China to back off efforts to gain the upper hand in the battle of bits and bytes.

虽然这场动乱已经暂时平息，但有些专家预期，中国将会卷土重来，以期在这场以位元与位元组进行的战争中占上风。

Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental wave's aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼-夏克传感器分别对1064nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

TWO young black men carjack a white woman's expensive SUV; a white, working-class police officer gropes a rich black woman while her husband, a black Hollywood executive, looks on in impotent rage; a Latina police detective and a Korean woman hurl racial insults at each other after a minor traffic accident; an Iranian shopkeeper sets off to kill a Latino locksmith who he assumes has cheated him.

两个年轻黑人抢走了一位白人妇女昂贵的SUV；一个工人阶级的白人警察在搜查时在一位有钱黑人妇女身上摸来摸去，而他的丈夫—-一位好莱坞的导演只能在一旁眼睁睁的看着事情发生，愤怒却又无能为力；一场小小的交通事故后一位拉丁裔的女警探与一位韩国妇女相互种族攻击；一位伊朗的小店老板因为觉得一位拉丁裔的锁匠欺骗了他于是就想去杀死他报复。

In addition, the momentum dependence of the nuclear mean field potential has been shown for the first time to be important for isospin diffusion in HIC''s and a explicit expression for the density dependence of the symmetry energy has been obtained by fitting the experimental data.

同时在国际上首次研究了核平均场的动量相关性对重离子碰撞中同位旋弥散的影响，发现核平均场的动量相关性对同位旋弥散有重要的影响。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。