查询词典 wave power

According to by the time series estimate power spectral density\'s periodogram law principle,the research adopts five level of orbital power spectra which US Federal railway Administrative bureau FRA proposed;then,through the Fourier inverse transformation,the orbital not smooth time domain samples are obtained, which determine the track irregularity peak-to-peak value and the corresponding wave length; on the basis of the research,the influence of the wheel track dynamic contact force are considered.Based on the orbital roadbed coefficient\'s definition,computation model is established to solve the roadbed equispaced spring constant,and the roadbed uniform spring stiffness is obtained by using the numerical simulation method.Finally,based on the Matlab procedure platform,the computational procedure is established,and the load time interval caused by the moving train acts on the roadbed is obtained.

根据由时间序列估计功率谱密度的周期图法原理，采用美国联邦铁路管理局FRA提出的五级轨道功率谱，通过Fourier逆变换得到轨道不平顺的时域样本，确定了轨道不平顺的幅值及对应的波长，以此为基础考虑轮轨动态接触力的影响；基于轨道路基系数的定义建立了求解路基均布弹簧刚度的计算模型，采用数值模拟得到了路基均布弹簧刚度；最后，基于Matlab程序平台编制了计算程序，得到了运行列车作用到路基上的荷载时程。

Application of SA866AE Three-phase PWM Signal Generator in AC/AC FC;2. By existing control question of mineral air compressor and power supply particularity in mine,using Mitsubishi corporation's IPM power module as main circuit component,METEL corporation's SPWM generator SA866AE as wave profile generator,a kind of transducer was designed.

针对矿用空压机控制存在的问题和矿山供电的特殊性，利用三菱公司IPM功率模块作为主电路器件，METEL公司的SPWM发生器 SA866AE 作为波形发生器，设计了一种宽输入电压范围、低成本、高可靠性的变频器，实现了矿用空压机的自动调节功能，节约了能源，提高了供气质量。

The method is to draw incident power and reflection power of radar system through directional coupler and bridge circuit,and carries out pretreatment for gathered data with micro control unit,then calculates standing wave ratio.

文中提出一种驻波比在线测试方法，该方法通过定向耦合器和电桥电路将雷达系统的入射功率和反射功率提取出来，然后用单片机对所采集到的数据进行预处理，从而计算出驻波比。

A circle is placed at the launch point to improve the interaction between the electron beam and the fields supported by the slow wave structure, thus to control the beam current density at the launch point, and to minimize the loss of the electron beam energy. The inaner radii of the extractor vanes are slightly larger than those of other SWS vanes, which increases the axial group velocity and enhances the microwave output power and efficiency. Implementation of two RF choke vanes stops the leakage of microwave pulse power toward the diode, and makes the device more compact than the conventional MILO.

该振荡器在阴极电子发射起点加圆环，控制此处电子束的发射密度，来减少电子能量的损耗，改善束－波互作用；逐渐加大慢波结构的后两个叶片的内半径，增大微波群速度，便于谐振腔中的能量输出，提高微波输出效率；采用两个扼流片有效地阻止了微波功率向二极管区泄漏，相应减小了器件的尺寸。

To achieve compact all-solid-state laser's operation, a plane-parallel cavity was employed with two mirrors separated by 1 cm, and obtained the fundamental-wave laser with central wavelength at 1044 nm. The maximal output power of 1.38 W was obtained with an absorbed power of 4.22 W, which corresponded to slope efficiency of 54%.

为了实现紧凑的新型全固态激光器的激光运转，设计了一个平平谐振腔，两个镜子的分开距离仅为1 cm，在这种腔结构下，得到了中心波长为1044 nm的基频激光输出，当吸收抽运功率为4.22 W时，基频激光的最大输出功率为1.38 W，相应功率曲线最大斜效率为54%。

In this paper, the possibility of using electromagnetic wave radiation pressure to the measurement of microwave power, especially the measurement of the peak power or total energy in a single shot high energy microwave pulse is discussed.

讨论了应用电磁波的辐射压力在空间测量微波功率，特别是单次脉冲高功率微波的峰值功率和能量的方法。

This thesis presents a single-phase three-wire photovoltaic energy conversion system. When the proposed system is operating at the maximum power point, the energy is fed to the utility with sinusoidal wave. In low insolation environment, the proposed system operates at the function of active power filter and battery charger. When the utility is fault, the system is disconnected from the utility source.

本文提出一个单相三线式光伏能量转换器系统，使太阳能光伏能量转换器运转於最大功率，将能量以弦波电流送入市电，在无光源时，为主动式电源滤波器的功能，此时可经由市电提供能量对蓄电池充电；当故障时，系统必须与市电解联。

Under the background of High Power Microwave technology, a novel family of waveguides for high power microwave transmission is proposed. Some other new types of guided wave structures formed by some classical geometrical curves are also explored in this dissertation.

在高功率微波技术日益得到重视的背景下，本文提出了一种新的大功率导波结构——五边形波导族，并对利用经典几何曲线构成的几种导波结构作了探索。

Themyoelectric wave of pylorus is little earlier than that of the omasum,after that themyoelectric wave of abomasum begins.

贲门、幽门、瘤胃、网胃和皱胃的肌电波均为有峰电活动的串波，而瓣胃肌电波是单波。

The results showed that compared with the control period, after injecting clenbuterol subcutandously, the amplitude of the fast wave potentials and slow wave potentials at the duodenal close to abomasum, the pylorus of abomasum and dorsal sac of the rumen, as well as the strainwave of rumen movements s...

结果表明，β激动剂双氯醇胺在功能上有与肾上腺素相似的作用，即可直接或间接地抑制山羊胃肠道电活动和运动。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。