要求高精度的

With the example of calculating, It is proved to be a method of geodetic coordinate transformation with high accuracy as well as an appropriate computing velocity.

并且通过具体的算例，验证了这种转换算法具有较高的计算精度，并且具有一定的速度保证，能够应用于很多精度要求很高的领域。

The boundary conditions and the latent heat of heat transfer system have been treated by heat-enthalpy method.

在这样的充填条件下，虽然金属压铸模的导热性很高，蓄热能力很强，但要求在压铸模型腔内获得形状完整、轮廓清晰、尺寸精度高的铸件，必须得选用合理的模具结构和压铸工艺，而压铸模具的尺寸精度和使用寿命在很大程度上取决于其在压铸过程中热应力和其产生的变形。

The genetic algorithm pays attention to unknown area search . It has high speed and relative low precision. It will not get into local extremum. The BP algorithm searches the area that include whole-space minimum. It can improve speed and recision.

遗传BP算法利用遗传算法进行全局搜索，注重搜索未知区域，处理速度快而对精度要求不高，不易陷入局部极小点，而利用BP算法搜索有最优点的区域，提高搜索速度和精度。

Large high-power solid-state laser facilities have a very high requirement for the total positioning error budget (0μm in general), so it is a very important to improve the stability of structure design.

大型高功率固体激光装置通常要求总的打靶精度为几十微米，这对结构的稳定性设计提出了很高的要求。

CPU of airborne computer implements existing data acquisition of unpiloted vehicle with low efficiency. To improve the efficiency and to solve problems on reliability, real time and precision, the design of acquisition system based on DSP which can make a circuit acquisition for 54 channels data is put forward. After acquisition, the data can transfer between the system and CPU of airborne computer through dual-port RAM. The software and hardware methods to revise ADC on DSP are described. Evidences show that the system can meet with the flight control system on reliability, real time and precision.

现有无人飞行器数据采集均由机载计算机主处理器完成，效率较低，为了提高效率，解决数据采集的可靠性、实时性及精度等问题，设计了一种基于DSP处理器的数据采集系统，该数据采集系统能够对54路模拟量进行巡回采集，给出了系统的软硬件实现方法，在数据采集结束后，系统通过双端口RAM与机载计算机主处理器进行数据传递；为了提高DSP片内ADC的采集精度，给出了片内ADC的软硬件校正方法；实验证明，该系统具有较高的可靠性，能够满足飞行控制系统对传感器数据采集的实时性及精度要求。

With the integration of computer, network technology, and automation technology, a cold box coremaking production system has been developed so that a networked coremaking shop has been realized.

制造业的飞速发展对铸件质量和尺寸精度提出了越来越高的要求，因而对构成铸件内腔的砂芯的要求也更高。

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。

Four sets of actual aerial photos are used to test;which are at different scale and in different terrain.The empirical results verify that image elements of exterior orientation obtained by a POS can satisfy the accuracy requirements of topographic mapping,no matter which scale and terrain the empirical block is classified to.However,to satisfy the accuracy requirements of object point in elevation,the accuracy requirements of exterior orientation elements are at least one time higher than that in planimetric mapping.

通过对摄自不同地区、多种摄影比例尺航摄影像的实验表明，由POS系统获取的影像外方位元素进行安置元素测图完全可以满足各种比例尺、不同地形图测绘的精度要求，但为了满足地物点的高程精度，对影像外方位元素的精度需求较用于平面测图时的至少要高出一倍以上。

The fold line trajectory model is used to calculate the firing data of red land laser terminal-guided projectile.The experiments demonstrate that the fold line trajectory model has advantages as below.One is the fold line trajectory model can truly reflect the fly discipli...

试验结果表明，&折线法&弹道模型具有以下优点：一是模型能较为真实地反映&近区域&射击时末制导炮弹飞行规律；二是运用该模型决定末制导炮弹射击诸元，精度较高，完全能满足射击的精度要求。

Jiang Ye Yiyang colored plant since 1997 zhejiang for the production of three Group took the body with yellow brass, there have been more than a decade of history, maturing technology, complete equipment, product quality higher than the national standards in the chemical products Composition, tolerance level of accuracy, mechanical properties, both inside and outside surface quality in areas such as technical requirements, Reflects a production capacity of enterprises, technical and management level.

化学成分，化学成分 GB/T5231—2001中的 H65化学成分范围，为使其性能更有保障，对主成分及有害杂质进行更严格控制，制订企业标准（Q/JY001—2004）。（2）公差及机械性能参照 GB/T1527—2006拉制管标准和浙江三花集团企业标准 Q/ZSH05·099—2002，制订企业标准（Q/JY001—2004），对其进行严格控制。三位四通阀的工作环境是液态或汽化的氟利昂等冷凝剂，其内腔气密性要求十分苛刻，这就需要 AC 黄铜管的内、外表面质量有极高表面质量，内、外表面光洁，无划伤、拉痕、起皮、沙眼、夹杂等加工缺陷，无酸、油、润滑等残留附着物。由于 AC 黄铜管在制作四通阀时，需要锯切、车削、冲孔等机加工，因此对公差精度要求很高。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐