往复的

We take sech form ansatz and solve the CNLS equations through variational approach. We obtain the analytical expression of nonlinear coupling term, which is in the lagrangian of CNLS. We apply a potential well model to analyze the interaction properties of self-trapping beams in detail, the results show that the interaction do not change the profile of the beams, two beams keep oscillating around their collective center periodically. The amplitude and period of this oscillation are both determined by initial separation of two beams.

我们采用Sech函数为试探函数，用变分法求解CNLS方程，（1）给出了CNLS方程所对应的拉格朗日中的非线性耦合项的解析表达，（2）利用势阱模型详细分析两自陷光束之间相互作用的特性，结果表明，相互作用没有改变孤子的形态，它们分别在与传播方向垂直的方向上绕它们的公共中心做往复振动，振动幅度及周期都取决于两光束的初始分隔。

This thesis aimed to discuss an electromagnetic energy harvester. Motion of a fluid driven by a 30 Hz pulse pump is used to activate the electromagnetic energy harvester. The periodic motion of the fluid in the chamber causes a harmonic vertical deflection in the diaphragm on which a permanent magnet is attached. Subsequently, the vibration of this magnet induces an output voltage in a solenoid hanging above it.

中文摘要本文是探讨电磁式能量产生器的机构，此电磁式能量产生器的主要作动方式为藉由频率30Hz的脉冲马达驱动工作流体，使工作流体呈周期性的流动让帮浦腔体上致动薄膜产生周期性的上下往复运动，因此帮浦腔体内产生压力周期性的变化，在薄膜上永久磁铁的振动，使得螺旋线圈感应产生电压的输出。

To start immediately to implement this plan, made large quantities of high performances the absolutely counter-attack robot, by "tited for fat" the way eliminates these the fellows who mutinied on the Moon, stemming from this time Earth humanity regarding kind of person robot specialSensitive, this has no recourse the plan is in the situation which keeps secret extremely is formulating the implementation, besides David and the entire unification, the third person had not known.

就在病床上，大卫博士忍着余下的伤痛忧思难眠，辗转往复思来想去，最后终于想出了一个以机器人对付机器人的绝妙方案，当灵感突然显现之后，大卫博士就立刻写成了一份详细的计划报告，然后火速转交给联盟主席全统一，全统一长官看完后，不禁拍案叫绝，并马上授权大卫博士开始实施这项计划，制造大批高性能的绝对反击机器人，以&以牙还牙&的方式清除那些在月球上哗变的家伙们，出于此时地球人类对于类人机器人的特殊敏感，这个迫不得已的方案是在极为保密的情况下制定实施的，除了大卫和全统一之外，没有第三个人知道。

A circle shear device for cutting holes in sheet metal as in claim 13 wherein said upper center shaft is vertically reciprocated between a first upward rest position and a second lowered operating position wherein: a said first upward position raises said first upper cutter wheel a sufficient distance to permit the unobstructed exchange of additional provided metal sheet through said cutting jaw; and b said vertical reciprocation means includes an pneumatic air cylinder.

削减的孔一个圆盘剪设备在金属板在要求13，说的上部中轴垂直被交换在第一个向上静止位置和第二个被降下的工作位置之间，： a首先说的向上位置培养说的第一个上部切削刀轮子一个充足的距离通过说的切开的下颌允许另外的提供的金属板通畅的交换；并且 b说的垂直的往复手段包括一个气动力学的空气圆筒。

In this topic design food machinery uses the high.pressured viscolizer, its principle of work is: Uses the electric motor after the level V belt transmission deceleration, leads crank revolving, the crank throw crank causes with in the crank hinge connecting rod impetus piston cylinder piston to make the straight reciprocating main motion in the piston cylinder, thus the impetus level hydraulic valve and two level of hydraulic valve function, produces the strength attracts, the row of mix material, achieves the even mix the goal.

本课题设计食品机械中用的高压均质机，它的工作原理是：采用电动机经一级三角带传动减速后，带动曲轴旋转，曲轴推动曲柄使与曲柄铰接的活塞杆带动活塞缸中的活塞在活塞缸中作往复直线运动，从而推动一级液压阀和二级液压阀的作用，产生的力吸、排混合的物质，达到均匀混合的目的。

In this topic design food machinery uses the high-pressuredviscolizer, its principle of work is: Uses the electric motor afterthe level V belt transmission deceleration, leads crank revolving,the crank throw crank causes with in the crank hinge connecting rodimpetus piston cylinder piston to make the straight reciprocatingmain motion in the piston cylinder, thus the impetus levelhydraulic valve and two level of hydraulic valve function, producesthe strength attracts, the row of mix material, achieves the evenmix the goal.

本课题设计食品机械中用的高压均质机，它的工作原理是：采用电动机经一级三角带传动减速后，带动曲轴旋转，曲轴推动曲柄使与曲柄铰接的活塞杆带动活塞缸中的活塞在活塞缸中作往复直线运动，从而推动一级液压阀和二级液压阀的作用，产生的力吸、排混合的物质，达到均匀混合的目的。

The billows, torn and lashed by the wind, encompass him hideously; the tossings of the abyss bear him away; all the tongues of water dash over his head; a populace of waves spits upon him; confused openings half devour him; every time that he sinks, he catches glimpses of precipices filled with night; frightful and unknown vegetations seize him, knot about his feet, draw him to them; he is conscious that he is becoming an abyss, that he forms part of the foam; the waves toss him from one to another; he drinks in the bitterness; the cowardly ocean attacks him furiously, to drown him; the enormity plays with his agony.

迎风崩裂的波涛狠狠地包围着他，波峰波谷带着他辗转上下，一缕缕的白练飞腾在他的头上，一阵阵的狂澜向他喷唾，巨浪的口把他吞没殆半；他每次下沉，都隐约看见那黑暗的深渊，一些未曾见过的奇怪植物捉住他，缠着他的脚，把他拉向它们那里去；他觉得自己也成了旋涡，也成了泡沫的一部分，波涛把他往复抛掷；他喝着苦汁，无情的海水前仆后继，定要把他淹没，浩瀚的泽国拿他的垂死挣扎来取乐。

The rotation,form drag due to local topographic inhomogeneities,and weak but appreciablestratification are suggested to be possible sources for this discrepancy.The clas-sical wall-layer parameterization of the turbulent dissipation rate is found to holdwell for reversing flows,while modifications are needed for rotating flows.

分析表明，潮流的旋转、由局地地形造成的型阻以及水体的弱层化可能是上述差异产生的原因；3、经典的壁湍流理论以及湍封闭模型中经常采用的湍动能与其耗散率间的关系对于弱层化的往复型潮流是成立的，而在旋转型潮流中，壁湍流理论需要进行修正。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。