高频率的

The electronic heating evaporator in the high-side gravity recirculation system in ANSI/ASHRAE 64-2500 standard is replaced by a new type plate evaporator which is more effcient and energy-saving, because the cold water outlet from the evaporator that is used to heat the cryogen can be used once again to cool the air in the air inlet trunk; an air processing unit is designed in the lab design, so to imitate all kinds of weather in each season in every location of China at any time the test is being made; the data selection system can send all the data in the test to the computer at one time, and to reduce the cost of the test some data which is more stable are read manually through traditional meters if this can not sacrifice the precision of the test.

本文的设计中用效率更高的新型板式换热器代替了原ANSFASHRAE 64——2500标准中压缩驱动循环系统中的电加热蒸发器，加热冷剂后得到的低温淡水还可以用于冷却进气通道中的空气，不仅提高了效率，而且更加节能；实验室方案中增加了空气处理系统，可以实现随时对全国各地各季节的空气状态进行模拟，方便实验的进行；采用数据采集系统将数据整体采集到电脑中方便数据处理，而且对于变化频率不高相对较为稳定的数据采取传统仪表进行人工读数，在保证测试结果准确性的前提下降低了成本。

The use of footscan balance test system of national high-level pistol, rifle shooters had a balance of stability tests, by analyzing the following major conclusions: First, all the athletes in men's pistol shooting athletes body posture and adjusting the balance of stability the capacity of the worst; the second, firing only state body sway eyes open area and before and after the shaking smaller decrease; and thirdly, the general balance of the stability of indicators (both before and after the body center of gravity, around shaking rate, trajectory length, shaking the area) can not accurately reflect the high level of shooting athletes balance the characteristics of stability, and derived indicators - per unit area of the track length (the total length of track and shaking the area ratio), both show the balance of stability, but also reflect the attitude adjustment ability, in the sway area certain circumstances, the greater its value, indicating that ability to regulate the more intense the frequency of shaking sooner, the better the stability of physical balance, in the actual shooting of firearms at the time of the impact of the smaller, can be used as shooting athletes evaluation and selection of indicators.

运用footscan balance测试系统对国家高水平手枪、步枪射击运动员进行了平衡稳定性的测试，通过分析得出以下主要结论：第一，所有射击运动员中男子手枪运动员身体姿态的平衡稳定性及调节能力最差；第二，射击训练只能使睁眼状态下身体晃动面积和前后晃动幅度减小；第三，一般平衡稳定性指标(身体重心前后、左右晃动幅度、轨迹长度、晃动面积)不能准确地反映高水平射击运动员平衡稳定性的特点，而派生指标——单位面积的轨迹长度(轨迹总长度与晃动面积的比值)，既显示平衡稳定性，又能体现姿态调节能力，在晃动面积一定的情况下，其值越大，表明调节能力越强，晃动的频率越快，身体平衡稳定性越好，在实射时对枪支的影响越小，可作为射击运动员的评价和选材指标。

In the ***, all types and fundamental principles of Radon transform are summarized systematacially. This *** starts from the general linear Radon transform, and then researches how to use the damped least square method to find the solution of the forward transform. However, the least squares smoothing effect will lead to a certain degree of trails in the data of Radon domain, which led to the application\'s limitations. After that the implementation in Radon domain and relative merits of linear Radon transform, parabolic Radon transform and polynomial Radon transform which have time invariance are introduced, the conjugate gradient method that can solve numerical solution is also given. And then the high resolution Randon transform is discussed, it introduces the regularization theory and Bayes principle into inversion, which successfully remove the negative affect caused by discrete Radon transform. Finally, we introduce the optimal weighting similar coefficient Radon transform, which adapt to the time variant quality of hyperbolic Radon transform.

本文系统总结了Radon变换的各种类型及其基本原理，从τ- p变换(即一般线性Radon变换)出发，研究利用阻尼最小二乘平方法求解其正变换，但是最小平方法的平滑作用会导致Radon域数据存在一定程度的拖尾效应，给这种方法的应用带来了很大的局限性；然后先容了具有时不变性的线性、抛物和多项式Radon变换在频率域的实现及其优缺点，给出了求解其数值解的共轭梯度算法；接着讨论了高分辨率Radon变换，它把正则化思想和贝叶斯原理引进到了反演中，很好的克服了离散Radon变换产生的截断效应对结果的不利影响；最后先容了适应双曲Radon变换时变性质的高分辨率最优相似系数加权Radon变换。

Through this experiment,it was measured that average diameter of the fundamental frequency light is 2.33 mm in the pattern of ordinary krypton pump,while in he pattern of the laster- diode bar pump the average diameter is only 1.25 mm,and the light field of the later also took on the standard Gaussian distribution,therefore formed the high-bright...

通过实验测量到普通氪灯泵浦方式中基频光的平均直径为2.33 mm，LD 阵列对称泵浦方式中基频光的平均直径仅为1.22 mm，并且呈现标准的高斯分布，形成了高亮度激光输出。实验研究了 Nd：YAG 调 Q 固体激光器的重复频率对 KTP 倍频晶体转换效率的影响。并且，在基频光平均功率11.2 w时，经 KTP 晶体倍频产生5.11W 的532 nm 绿光输出，光-光转换效率达到45.6%。

The spectrum analysis of the air-ultrasonic waveform indicates that when the matcher thickness is calculated at the highest spectrum and the subsequent higher spectrum of the pulse waveform, it can obtain a better result. But all the highest spectrum of the air-ultrasonic waveform moves to the high frequency zone in the experiment, which is a possible important reason that the testing extent of the air-ultrasonic transducer is limited.

经对空气超声波形进行频谱分析后发现用脉冲波形的最高谱线及次高潜线对应的频率计算匹配层厚度，可得到较好的匹配结果，但是空气超声波形的最高谱线均移向高频段，这可能是造成脉冲空气超声换能器可检测的范围有限的一个重要原因。

The performance of magnetic levitation is determined mainly by the characteristic of its controller and solving the problems of the high precision, high esponse frequency, output immune from the disturbance, the parameter perturbation and the uncertain factors from outside is very difficult. The traditional methods can not meet the needs of the system. So it has great significance to study the control method of magnetic levitation.

磁悬浮系统性能的优劣很大程度上取决于控制器的特性，高精度、高响应频率和输出不受外界干扰的特性以及磁悬浮中参数的摄动和外界不确定的干扰因素都是难以解决的棘手问题，传统控制难以满足系统要求，因此对控制方法的研究有其非常重要的意义。

The performance of magnetic levitation is determined mainly by the characteristic of its controller and solving the problems of the high precision, high response frequency, output immune from the disturbance, the parameter perturbation and the uncertain factors from outside is very difficult. The traditional methods can not meet the needs of the system. So it has great significance to study the control method of magnetic levitation.

磁悬浮系统性能的优劣很大程度上取决于控制器的特性，高精度、高响应频率和输出不受外界干扰的特性以及磁悬浮中参数的摄动和外界不确定的干扰因素都是难以解决的棘手问题，传统控制难以满足系统要求，因此对控制方法的研究有其非常重要的意义。

Radio spectrometer is important method and main instrument of radio astronomy research, through which we can research radio astronomy phenomenon in wide frequency spectrum and continuous time with high frequency resolution and high temporal resolution.

射电频谱仪是通过高的频率分辨率和高的时间分辨率，在广泛的频谱范围内和连续的时间演化上进行射电天文观测的仪器，它是射电天文研究的重要方法和主要工具。

This method can make sure the structure radiant sound status in total noise and the detail phonate part quickly and correctly.(3) Study on the control mechanism of structure noise radiated from rotary machines, we build a common model of rotary machine structure noise analysis relied on the general characters of rotary machines. Based on this model, we analyzed various influence factors to structure radiant noise using the union of revolution and numerical calculation method. We found that the joint stiffness between the rotor and the frame is the most sensitive parameter of structure radiant noise by calculating and analyzing.

根据本文对于旋转机械结构噪声控制技术的研究结果和惯性振动筛工作的特殊要求，对有关参数的选择进行了讨论，并通过试验为降低惯性振动筛噪声找到了两个新的方法：即，在轴间相对运动要求不高的情况下，可以在激振器与筛体之间安装一组减振器，通过适当选取减振器参数，既可以使机体在工作频率附近获得稳定振幅，保证振动筛正常工作，又可以使机体的高频响应减小，降噪效果显著；反之，如果轴间相对运动精度要求(来源：1aABC论文网www.abclunwen.com)较高，可以采用空心滚动体轴承，在保证滚动体强度的条件下也可以获得较好的降噪效果。

A7800 Features: 10 Mb s Manchester encoding decoding with receive clock recovery Patented digital phase locked loop decoder re- quires no precision external components Decodes Manchester data with up to g18 ns of jitter Loopback capability for diagnostics Externally selectable half or full step modes of opera- tion at transmit output Squelch circuits at the receive and collision inputs re- ject noise High voltage protection at transceiver interface (16V) TTL MOS compatible controller interface Connects directly to the transceiver cable A7800 Maximum Ratings: A7800 Pinout:· NPT IGBT technology · low saturation voltage · low switching losses · switching frequency up to 30 kHz · square RBSOA, no latch up · high short circuit capability · positive temperature coefficient for easy parallelling · MOS input, voltage controlled · ultra fast free wheeling diodes · solderable pins for PCB mounting · package with copper base plate

A7800特点： 10兆s曼彻斯特编码与接收时钟恢复专利解码数字锁相环解码器重新奎雷斯没有精确数据的外部元件曼彻斯特解码高达全部G18抖动纳秒环回功能用于诊断外部可选的一半或整步模式的歌剧和灰在传输和接收碰撞投入重新ject高噪音在收发器接口（16V的）马鞍山的TTL兼容控制器接口电压保护输出静噪电路直接连接到收发器的电缆 A7800最大额定值： A7800引脚说明：·不扩散核武器条约IGBT技术·低饱和电压·低开关损耗·开关频率可达30千赫·平方米RBSOA，没有锁定了高短路能力··正温度，便于parallelling·马鞍山消耗系数，电压控制·超高速免费·印刷电路板焊接的引脚安装·铜底板包续流二极管

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！