原理

This paper treats the mechanism and application of piano pedal in four aspects: the history、the construction mechanism、the sorts and the application of piano pedal.

文章通过对钢琴踏板的历史、钢琴踏板的构造原理、钢琴踏板的种类、钢琴踏板的运用这几大方面对钢琴踏板的原理与运用进行论述。

Taking a general view of the paper, major innovative ideas and returns are as follows: The main innovative ideas are as follows: 1. The paper put forward the new idea that combine water-saving drilling with rotary percussion drilling creatively according to the present situation of water resource lack seriously and the background of implementation of state geological survey strategy. 2. The working principle of new designed system of water-saving hydraulic percussion device completely different from traditional hydraulic percussion device, the system can carry out rotary percussion drilling on the condition that no surface water be consumed, and achieve the purposes that saving surface water, cutting cost and improving drilling efficiency. 3. The design conception of steel ball percussion device is very novel, the percussion device is durable, with a simple structure, at the same time drilling efficiency would be improved highly and drilling cost would be reduced greatly when drill with the steel ball percussion device.

综观全文，论文的主要创新点及研究成果如下：主要创新点： 1、结合我国许多地区水资源严重短缺的现状以及国家实施地质大调查战略的背景，创造性地提出了&节水钻探&和&回转冲击钻进&结合起来的新思维； 2、设计出的节水型液动冲击器系统，其工作原理跳出了传统液动冲击器要消耗大量地表水的原理模式，在基本不消耗地表水的情况下便能实现回转冲击钻进，达到节约地表水、降低成本、提高钻探效率的目的； 3、设计的球体冲击器构思新颖，克服了同类产品冲击功传递效率低的弊端、且结构简单、经久耐用，可大幅度提高钻探效率、降低钻探成本。

Super RENS technology has been applied in super high density optical data storage, near field photolithography, nanome...

围绕Su per RENS技术，通过综述它的基本原理、物理机制以及各项应用，指出了基于近场激发与增强原理的新型多层纳米薄膜结构在未来非线性光学器件上的应用与发展前景

The thesis mainly researches on the single phase AC/AC converter in the topologies including AC_Buck and AC_Cuk. Firstly, the operating principles of the two converters are analyzed in detail and the rules of their parameters design are educed; The commutation of their power switches which is the key of these topologies to realize is analyzed in detail and a feasible solution which can be named RCD-Commutation mode is presented and proved effectual by theory analyses and simulation results.

本文首先分析了AC_Buck变换器的变换原理，得出了电路参数设计准则；继而对电路实现的难点即功率管换流问题进行了深入分析，并得出了一种可行的解决方案即RCD换流方案；作为对简单拓扑单相直接AC/AC变换器控制策略的探索，本文以AC_Buck为平台，对电压单闭环瞬时值控制方案进行了研究，在理论分析和仿真研究的基础上设计并制作了一台采用RCD换流、电压单闭环瞬时值控制的AC_Buck变换器原理样机。

How it works: decompression works is the use of diaphragm, spring and piston and other sensitive components, to change the valve core and valve seat of the gap to achieve the automatic decompression purposes.

工作原理：减压工作原理是利用膜片、弹簧和活塞等敏感元件，改变阀芯与阀座的间隙来达到自动减压的目的。

The gun body of vacuum plasma welding chamber for titanium and titanium alloy imported from Germany has been reformed based on the principle of compression effection of plasma arc and stability of electric arc.

为了满足大尺寸钛及钛合金电极的焊接要求，宝钛集团有限公司依据等离子弧的压缩效应原理及电弧的稳定性原理，对从德国引进的钛及钛合金真空等离子焊箱枪体的阴极和喷嘴进行了技术改造。

Through research on principle and approach, this paper puts forward three new methods in power cable fault location.

本文在现有的电缆故障测距方法的基础上，通过在原理和方法上进行深入研究，提出了三种在原理上更精确、工程上更实用的电缆故障测距新方法。

Especially is studying independently with the teaching domain application, as a result of present's some curricula, like the automatic part, the electrical machinery dragging principle, curricula and so on automatic control principle very difficult to understand abstractly, is unable to demonstrate to schoolmate, this regarding, regardless of being the learner or the pedagogues is a question.

尤其是在自学与教学领域的应用，由于现在的一些课程，如自动元件，电机拖动原理，自动控制原理等课程十分的难懂抽象，无法向同学演示，这对于无论是学习者还是教育者都是个问题。

This paper introduces the principle and classification of mechanical balance,the allowable amount of unbalance and balance precision in the process of mechanical manufacturing,the balance testing method and its principle,the dynamic balancing system,and digital signal processing technology for rotating parts.

介绍了机械平衡的原理及分类，以及机械制造过程中允许的不平衡量和平衡精度，并对回转件的平衡实验法及原理、动平衡测试系统以及数字信号处理技术作了介绍，根据动平衡理论分析了平衡测试技术在生产中的应用。

Then using the light cone formula, we calculated the x distribution of all partons and flavor asymmetry 〓-〓 which is consistent with the measurement of experiment.

平衡模型认为细致平衡原理给出了过强的限制，带来了计算上的不自洽，于是放宽了限制，提出了平衡原理，〓，即针对任何一个Fock态A，转变出去的几率和转变进来的几率相等。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。