往复的

Twilight reigns over it. We perceive vast fluctuations in that fog, a dizzy mirage, paraphernalia of war almost unknown to-day, pendant colbacks, floating sabre-taches, cross-belts, cartridge-boxes for grenades, hussar dolmans, red boots with a thousand wrinkles, heavy shakos garlanded with torsades, the almost black infantry of Brunswick mingled with the scarlet infantry of England, the English soldiers with great, white circular pads on the slopes of their shoulders for epaulets, the Hanoverian light-horse with their oblong casques of leather, with brass hands red horse-tails, the Scotch with their bare knees plaids, the great white gaiters of our grenadiers; pictures, not strategic lines--what Salvator Rosa requires, not what is suited to the needs of Gribeauval.

com 。黄昏将近，千军万马在暮霭中往复飘荡，那是一种惊心动魄的奇观，当时的军容今日已经不可复见了，红缨帽，飘荡的佩剑，交叉的革带，榴弹包，轻骑兵的盘绦军服，千褶红靴，缨络累累的羽毛冠，一色朱红，肩上有代替肩章的白色大圆环的英国步兵和几乎纯黑的不伦瑞克步兵交相辉映，还有头戴铜箍、红缨、椭圆形皮帽的汉诺威轻骑兵，露着膝头、披着方格衣服的苏格兰兵，我国羽林军的白色长绑腿，这是一幅幅图画，而不是一行行阵线，为萨尔瓦多·罗扎①所需，不为格里德瓦尔②所需。

When two axes make the synchronized reverse rotation, on each instantaneous two axis eccentric qualities produce the centrifugal force of inertia, always mutually counterbalances along x-x force component, but always mutually superimposes along Y-Y force component, this has formed the sole this direction simple harmonics strength.

两轴作同步反向回转时，每一瞬时两轴上偏心质量所产生的离心惯性力，沿x-x方向的分力总是互相抵消，而沿Y-Y方向的分力总是相互叠加，这就形成了单一的该方向的简谐力。该力作用在筛箱上，驱动筛箱作轨迹为直线的往复振动。

The design work involves: overall design of milling machine, draw out of drive project, design of lathe bed, theory design and calculate of feed part, and the design of to-and-fro guide screw leading screw for profile modeling machining.

专用铣床的设计包括：铣床的总体设计，传动方案的拟订，床身的设计，进给部分的理论设计和计算，以及用来仿行加工的往复丝杠的设计。

The control of an electromagnetic valve in the ABN brake chamber forces the spring to vibrate at a frequency of 18 times per second while braking, and also with certain natural frequency reciprocating motion.

利用停易ABN制动气室弹簧的振动及电控装置控制电磁阀激振，迫使气室弹簧在整个制动过程中不但以每秒18次的自振频率振动，同时又以一定的固有频率往复运动，利用弹簧的储能作用，将刹车时产生的声能和热能用弹簧的势能和动能来置换，从而达到降低制动噪声、温度和磨损的目的。

These, in turn, generate more havoc and poverty, which inspires the politicians to create more programs ... and the downward spiral repeats itself until the productive sectors of the economy collapse under the collective weight of taxes and other burdens imposed in the name of fairness, equality and do-goodism.

这些新的措施会产生更多的混乱和贫困，而后鼓励那些政治家们出台更多的政策来平息，如此往复循环……螺旋式的下降一直在重演，直到在公正、平等和美好的面具下，不堪重负的税收和其他负担导致生产部门的经济大崩溃。

Settlement characteristics are studied based on formula of suspended sediment settling velocity and previous research results. Results show that the suspended sediment flux quickly decreases from the Hangzhou Bay to the offshore area. Although the suspended sediments are primarily transported towards the offshore area, net transport towards the Hangzhou Bay is also found in the study area. The study area is basically located in hydrodynamic balance belt, and the suspended sediment transport is characteristics of reciprocating movement and small amount of net sediment discharge. The net suspended sediment transport is mainly controlled by average current transport, Stokes drift-induced transport and gravitational circulation transport. The advection transport effect gradually weakens and gravitational circulation transport evidently intensifies from Hangzhou Bay to the offshore area. Settling velocity of single particles is far smaller than that of floccules, so, influence of flocculation of suspended sediments must be taken into the consideration.

结果表明，研究区净悬沙通量自杭州湾内向外海迅速变小，悬沙总体由杭州湾向外海输运，但同时存在向杭州湾方向的净输沙；研究区基本处于水动力平衡带，悬沙输运具有往复搬运、净输沙量小的特点；平均流输运、Stokes漂移输运和垂向净环流输运是引起悬沙泥沙净输运的主要作用机制，自口门至外海，平流输运作用逐渐减弱，垂向净环流输沙在悬沙净输运中所占比例逐渐增加；舟山群岛海域既是杭州湾向东海输运泥沙的重要通道，也是东海沿岸流携带泥沙向南输运的过渡地带；研究区单颗粒泥沙沉降速度很小，远小于絮凝沉降速度，在研究本区悬沙沉降时必须考虑絮凝的影响。

The study area is basically located in hydrodynamic balance belt, and the suspended sediment transport is characteristics of reciprocating movement and small amount of net sediment discharge. The net suspended sediment transport is mainly controlled by average current transport, Stokes drift-induced transport and gravitational circulation transport. The advection transport effect gradually weakens and gravitational circulation transport evidently intensifies from Hangzhou Bay to the offshore area. Settling velocity of single particles is far smaller than that of floccules, so, influence of flocculation of suspended sediments must be taken into the consideration.Incipient velocity and transport flux of surface sediments are analyzed using formulas of incipient velocity and transport flux. Transport trend and controlling factors of surface sediments are studied by the method of grain size trend analysis.

结果表明，研究区净悬沙通量自杭州湾内向外海迅速变小，悬沙总体由杭州湾向外海输运，但同时存在向杭州湾方向的净输沙；研究区基本处于水动力平衡带，悬沙输运具有往复搬运、净输沙量小的特点；平均流输运、Stokes漂移输运和垂向净环流输运是引起悬沙泥沙净输运的主要作用机制，自口门至外海，平流输运作用逐渐减弱，垂向净环流输沙在悬沙净输运中所占比例逐渐增加；舟山群岛海域既是杭州湾向东海输运泥沙的重要通道，也是东海沿岸流携带泥沙向南输运的过渡地带；研究区单颗粒泥沙沉降速度很小，远小于絮凝沉降速度，在研究本区悬沙沉降时必须考虑絮凝的影响。

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve.

采用RNG k-ε湍流模型、动网格技术以及用户自定义程序，对往复泵泵阀的启闭过程进行了非定常数值仿真，得出了不同弹簧因素下、阀门从开启到关闭的过程中，阀芯的升程随时间的变化规律、阀的迟滞关闭时间以及阀芯落座的瞬时速度。

The torque me asurement experiment in hand tappin g shows that suitable tapping motion w ith high frequency can remarkably re duce tapping torque,and the dominating parameters in hand tapping are cutti ng angle and separating angle,which laid a foundation for the study on vib ration tapping and its popularization and a pplication.

对手动攻丝这种极限振动攻丝过程的扭矩测试结果表明，丝锥对工件的低频、低速往复切削作用也可以使攻丝扭矩显著下降。这表明影响手动攻丝扭矩的主要因素不是振动频率或冲击的大小，而是切削角和分离角的大小，这为进一步究明振动攻丝的机理及促进振动攻丝技术的推广应用奠定了基础。

Based on the multi-layer shell element model that is now widely used in the nonlinear analysis for the shear wall structure,different constitutive models of concrete and reinforcement are discussed in this paper.Selected in this discussion were two models:a new constitutive model for concrete,referred as microplane model,which could precisely simulate the nonlinear behaviors of concrete under complicated stress conditions,and a constitutive model for reinforcement,which could accurately modeling the hysteretic behaviors of the reinforcement.Some shear wall tests were analyzed to demonstrate the precision of the proposed model.

在适用于剪力墙结构非线性分析的分层壳墙单元模型基础上，对其中的混凝土本构模型和钢筋本构模型进行讨论，采用一种能较好的模拟混凝土在多轴复杂应力状态下特性的microplane模型和一种能够全面反映钢筋在往复载荷下各种复杂受力特性的钢筋本构模型，分别模拟混凝土和钢筋的力学行为特征。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。