精度

The second, IGG99S, is limited in South China Sea and calculated by using along-track vertical deflection with 1D Hlbert transform mentioned above with an accuracy of 13.6mGal and a resolution of 2'×2'.

随着分辨率的提高，研究范围的扩大，反演精度会有所下降，但总的说来，本文的总体精度达到的国外同行们的精度。

The technologies such as the clustering diamond cutting tool in the fine machine and the reasonable cutting tool angle parameters, designing appropriable clamp that increases the oriented accuracy and reduces the strain of the work piece, the natural aging that releases the stress of the coarse machine and increases the accuracy of the part shape tolerance,...

提出在精细加工中采用聚晶金刚石刀具，选择合理的刀具几何参数；设计专用夹具提高定位精度；通过自然时效释放粗加工应力，提高零件形位公差精度；采用以磨代钻、代铣等工艺措施，提高材料的机加工精度，并解决了玻璃纤维分层和撕裂等问题。

The structure is novel,the technology is advanced,the structure is novelty,the operation is easy and flexible and maintenance is convenient all kinds of material's mechanical performance's arylate and the test of production's quality.It is used for scientific research department advanced school or technical secondary school and enterprise.

技术参数： 1、量程范围：5KN 力值精度：示值的±0.5%以内 3、试验速度：0.1mm/min--500mm/min 速度允许误差：示值的±1.0%以内 4、有效拉伸距离：900mm 5、位移测量精度：示值的±1.0%以内 6、变形测量精度：示值的±1.0%以内 7、采集速率：50次/S 8、打印功能：打印测试后的试验数据及曲线 9、电源电压：AC220V 50Hz 10、外型尺寸：550mm×450mm×1600mm 11、重量：75kg

The results show that, all the three methods can effectively correct the frequency, the energy centrobaric correction has the lowest precision and the ratio correction is the fastest and its precision is almost not affected by the change of signal to noise ratio.

结果表明：3种算法都可以使信号的频率更接近于真实值，其中能量重心法校正精度相对较低，比值法和相位差法精度较高，尤其是比值校正算法处理速度更快，校正的精度基本不受信噪比的影响。

Basic principles of energy centrobaric correction,ratio correction and phase difference correction were expounded.

结果表明：3种算法都可以使信号的频率更接近于真实值，其中能量重心法校正精度相对较低，比值法和相位差法精度较高，尤其是比值校正算法处理速度更快，校正的精度基本不受信噪比的影响。

Due to existing signal processing technology's shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high-precise signal processing technology:firstly,to get power spectrum with Hanning windowed Welch modified periodogram, search its peak value frequency;secondly, to apply zooming analysis via Goertzel algorithm;at last,to get a highly precise doppler frequency with energy centrobaric rectifying algorithm.

针对存在的缺点，本文提出了一种应用于激光多普勒测速的高精度信号处理技术，即首先利用加Hanning窗的Welch修正周期图算法得到信号功率谱，搜索其谱峰值频率，接着利用Goertzel频谱细化算法对搜索的谱峰进行细化分析，再引入能量重心频谱校正算法对细化后的谱峰进行校正分析，从而将离散频谱分析算法、频谱细化算法和频谱校正算法三者有机结合起来，充分发挥各自的优点：通过加Hanning窗的Welch修正周期图算法快速得到功率谱及峰值频率，通过Goertzel算法获得分析频带的高分辨率频谱，然后通过能量重心校正算法对细化后的频谱进行高精度校正，这样不仅保证了算法的高效性，而且大大提高了分析的精度。

The given experimental results indicate that the measuring precision of the centroid and the centroidal deviation is no more than 0.1 mm and 0.01 mm respectively, which satisfies the qualification needs for high accuracy measuring the centroid and centroidal deviation of bullets.

给出的试验结果表明，质心测量精度≤0.1 mm，偏心测量精度≤0.01 mm，同时满足弹丸高精度质偏心的测量需求。

Using this function, the operation speed and precision of the algorithm is analyzed elementarily by the computer simulation and how to improve the precision is introduced farther as well.

并利用此功能，通过计算机仿真的方法，对四点共球法的运算量和补偿精度做了初步分析，并给出保证补偿精度的注意事项及进一步提高补偿精度的方法。

A"white light"interferent system is completed in this paper. The conventional methods, which gauge polarized mode by measuring the light intensity, is of intrinsic errors because of the limit in theory and technology. And the precision of measurement result is confined to the precision of devices used in the measurement system.

以光强测定为基础的传统测量方法，在运用到光纤及光纤器件的偏振态测量时，由于原理和技术实现方面的限制，测量结果的精度受制于测量系统中所用器件的精度，并且带有较大误差，测量精度不高。

GSG equipment Well, there are more than 100 Taiwan and American Gleason spiral bevel gear processing and testing equipment, a large number of NC high-precision design and other supporting equipment: high-precision coordinate SIP such as Switzerland and boring machine tool microscope, Japan TOYODA high-precision universal grinder , OKUMA CNC machining centers and cars, high-precision Germany KAPP spline grinder, the U.S.

GSG装备精良，有100多台美国格里森螺旋伞齿轮加工及检验设备，还有大量数控加工设计及其它高精度的配套设备：如瑞士SIP高精度坐标镗床及工具显微镜，日本TOYODA高精度万能磨床，OKUMA加工中心及数控

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。