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high-accuracy     
相关语句
  高精度
     Achieving low-cost and high-accuracy A/D conversion in AT89C2051
     利用AT89C2051实现低成本高精度A/D转换
短句来源
     High-accuracy A/D Converter AD7730 and Its Application
     高精度A/D转换器AD7730及其应用
短句来源
     A HIGH-SPEED HIGH-ACCURACY A/D CONVERTER
     高速高精度A/D转换器
短句来源
     Properties of Temperature Sensors MAX6666/6667 with High -Accuracy PWM Output and Its Applications
     高精度PWM输出的温度传感器MAX6666/6667的特性及应用
短句来源
     A High-accuracy Control System Based on DSP and AD7846
     基于DSP和AD7846的高精度控制系统
短句来源
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  高精度的
     High-speed and high-accuracy are the trends in development of machine tool, we need to use advanced and appropriate method to design machine tool.
     机床发展日益朝向高速度和高精度的方向发展,这对机床的设计提出了更高的要求,需要采用更加先进和合理的设计方法来完成机床设计。
短句来源
     Comparing with PID(control),the high-accuracy H_∞ feedback control is better.
     通过与PID控制方法相比较,说明带有高精度的H∞反馈控制的效果更佳.
短句来源
     ATT7026 is a kind of high-accuracy chip used in the electric energy measure.
     ATT7026是一种高精度的电能专用计量芯片。
短句来源
     ⑵ Based on C/A code DGPS and common voice transmitter-receiver , the low-cost equipment is applied to realize the high-accuracy motorcar test real-time dynamic monitoring system .
     ⑵ 基于C/A码DGPS和普通语音电台,用低成本设备实现了高精度的汽车试验实时动态监控系统,技术可行;
短句来源
     Has introduced the four-axis servo controller based on DSP and FPGA. The servo controller regards TI Company DSP chip TMS320LF2407A as the main chip,has adopted standard ISA bus structure,has high -integration and high-agility,has accomplished in real-time complex boolean calculation and control algo- rithms during motion control,and can be used to realize high-speed and high-accuracy servo control for mul- tiple axis.
     介绍了一种基于DSP和FPGA的四轴电动机伺服控制器,该控制器以TI公司DSP芯片TMS320LF2407A作为主控芯片,采用标准的ISA总线结构,具有较高的集成度和灵活性,可实时地完成运动控制过程中复杂的逻辑处理和控制算法,能实现多轴高速高精度的伺服控制。
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  精度高
     Variable-frequency speed governing technology is high-accuracy and strong-overload, and it is the most reliable technology of electric drive.
     变频调速技术是一种调速精度高、电机启动电流小、过载能力大 ,在电力拖动中应用最为可靠的一种调速技术。
短句来源
     The simulation results demonstrate that the method has advantages of constant parameters, small calculation quantity, fast-speed and high-accuracy, it is good at real-time predicting tracking.
     仿真结果说明,该方法参数固定、计算量小、速度快、精度高,利于实时预测跟踪。
短句来源
     According to the high-accuracy and high-resolution marine geoid such as EGM96,GGM01 and GOCE geoid to be acquired in the future,analysis on the methods of ocean circulation study and their possibility are presented in this paper.
     本文从EGM 96 ,GGM0 1与未来的GOCE任务获取的高精度高分辨率海洋大地水准面的角度对洋流的研究方法与可行性进行了分析
短句来源
     The numerical result implies that the high-accuracy upwind scheme has the advantage of high order accuracy and good stability.
     计算结果表明,高精度迎风格式具有精度高、稳定性好等特点.
短句来源
     The application in full vision Mounter SMT2505 demonstrates that the average error of detection in center and the executive time are less than 1 pixel and 50ms respectively,which maintains the advantages of conventional Hough transform,such as high-accuracy and good performance in anti-noise and improves the processing speed for 2~3 orders of magnitude.
     在全视觉贴片机SMT2505上应用表明,Mark中心检测误差和执行时间分别小于1个像素和50ms。 继承了传统Hough变换检测精度高、抗噪能力强的优点,速度比传统Hough变换提高了2~3个数量级。
短句来源
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  高准确度
     The design of high-speed and high-accuracy VXI bus modular DMM
     高速、高准确度VXI总线DMM模块的设计
短句来源
     According to the characteristics of Σ-ΔDC in high -speed with no latency, high resolution and low noise, high -speed and high - accuracy VXI bus modular DMM is designed using the latest chip LTC2440 and LTC2400. Errors have been analyzed and programmable calibration has been brought forward for modifying errors. It has been debugged.
     依据∑-△模数转换器高速无迟滞、高分辨率、低噪声等特点,采用AD转换芯片LTC2440和LTC2400,设计了高速、高准确度数字多用表VXI模块,进行了误差分析,提出了运用程控校准技术修正误差.
短句来源
     Synchronously, big displacement high-accuracy grating displacement sensor is adopted which can measure X, Y and Z displacement of the measurement head accurately.
     采用大位移高准确度的光栅位移传感器能精确的测出测头X、Y及Z方向的位移量。
短句来源
     According to the characteristics of the Σ-ΔADC in high-speed with no latency,high resolution and low noise,a high-speed and high-accuracy VXI bus Modular DMM is designed by using the latest chip LTC2440.Errors have been analyzed and programmable calibration has been brought forward for modifying errors.
     依据Σ-Δ模数转换器高速无迟滞、高分辨率、低噪声等特点,采用最新的AD转换芯片LTC2440,设计了高速、高准确度数字多用表VXI模块,并进行了误差分析。
短句来源
     A Wide-speed Range and High-accuracy Digital Tachometer Based on Auto-changing of Measuring Time
     基于测量时间动态调节的宽量程高准确度转速数字测量法
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      high-accuracy
    High-accuracy control systems with singular perturbations
          
    High-Accuracy Equation of State for a System of Hard Spheres
          
    The gas motion is simulated on the basis of a high-accuracy numerical method using adaptive movable networks.
          
    Attention is focused on regularly extendable problem solutions, for which purpose a high-accuracy hybrid numerical-analytical method of accelerated convergence and extension in a parameter is developed.
          
    Analysis is made of the possibilities of applying high-accuracy numerical methods developed for simulating two-phase processes.
          
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    In this paper the general synthesis problem of optimal control systems with the criterion of transient responses as a positive integral functional (3) is discussed.In the first part it is assumed that the motion of controlled object is described by a system of ordinary differential equations and that the final states of the system form a bounded and closed convex region in n-dimentional euclidian phase space. A method is proposed for finding all optimal control functions which lead any starting state into the...

    In this paper the general synthesis problem of optimal control systems with the criterion of transient responses as a positive integral functional (3) is discussed.In the first part it is assumed that the motion of controlled object is described by a system of ordinary differential equations and that the final states of the system form a bounded and closed convex region in n-dimentional euclidian phase space. A method is proposed for finding all optimal control functions which lead any starting state into the given final region of states. Some conclusions are obtained from the maximum principle by using transversal conditions of optimal trajectories in terminal points, and the particular properties of the stated problem are pointed out. The case of linear dif-ferential equations with integral quadratic functional criterion is investigated in detail.Further, in the second part the fundamental properties of isoloss regions, the rela-tions between the isoloss region and optimal control functions are indicated. As a direct result a partial differential equation determining the optimal loss-function J (x) is found and the connection between function J (x)and optimal vector control function u (x) is also stated. The methods proposed are practically the extension of the me-thods used by us for designing time optimal control systems as seen in [5, 6 ,7].Finally, an example is illustrated with optimal trajectories shown in phase plane.The necessary numerical data is calculated by an analog computer with high accuracy.

    文中研究了具有公式(3)表示的一般正积分泛函的最优控制系统的综合问题.在第一部分中研究了具有控制参数的一阶微分方程组.控制系统的终点状态为n维相空间内的某一逐段光滑边界的闭性区域Ω.文中指出了根据极大值原理和轨道终点的横截条件寻找引到Ω的所有最优轨迹的方法.这里详细地研究了具有二次泛函和被积函数中不明显含有控制参数的质量指标泛函的线性方程情况.在文中第二部分研究了等损耗区的主要特性.指出了等损耗区与最优控制函数之间的关系.导出了求算最优损耗函数J(x)的偏微分方程,以及这一函数与最优控制函数u(x)的关系.上述方法是我们曾在文献[5,6,7]中用过的最优快速系统的综合方法的推广.文章最后举有例证.

    In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

    In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

    本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

    Application of the thin layer chromatographic method to the determination of ergometrine, ergotamine and ergotoxine in ergot has been studied. One gram of defatted ergot was accurately weighed and macerated with a mixture of 10 ml chloroform-methanol-ammonia (90:9:1) for 24 hours in a brown flask (50 ml volume). Five ml of the extract were pipetted into an Erlenmeyer flask (10 ml volume), placed in a vacuum desiccator and pumped to dryness at room temperature. The residue was dissolved in 0.25ml methanol, 0.1...

    Application of the thin layer chromatographic method to the determination of ergometrine, ergotamine and ergotoxine in ergot has been studied. One gram of defatted ergot was accurately weighed and macerated with a mixture of 10 ml chloroform-methanol-ammonia (90:9:1) for 24 hours in a brown flask (50 ml volume). Five ml of the extract were pipetted into an Erlenmeyer flask (10 ml volume), placed in a vacuum desiccator and pumped to dryness at room temperature. The residue was dissolved in 0.25ml methanol, 0.1 ml being applied onto a 0.05×4.5×19 cm alumina layer and developed with a mixture of benzene-chloroform-absolute alcohol (7:3:0.5). Fluorescent spots of ergometrine, ergotamine and ergotoxine were located under UV light and separately transferred with a collector into reagent tubes. To each of these were added 0.5 ml ethanol, 1.5 ml 0.2N sulphuric acid, and 4ml van Urk's reagent. After shaking and standing for half an hour, the mixture was centrifuged and the clear blue solution determined colorimetrically. Analysis of an ergot sample, repeated six times, gave an average of 0.0255% for ergometrine, 0.0178% for ergotamine and 0.0143% for ergotoxine. Recovery of pure ergot alkaloids and experiments with added alkaloids showed high accuracy by this method. The procedure is simple and requires little organic solvents.

    本文研究了应用无粘合剂氧化鋁薄层层离和光电比色相結合的方法,測定麦角中三种主要生物碱的含量。回收率試驗表明,本方法具有較高的准确性,如麦角新碱的平均回收率为97.3%,标准誤差±1.7%;麦角胺的平均回收率为96.2%,标准誤差±2.2%;麦角毒碱的平均回收率为99.3%,标准誤差±0.9%。加量試驗的結果表明,本方法可以应用于麦角中三种主要生物碱的含量測定。作者用此方法測定了披碱草、老芒麦、高滨麦三种野生麦角和二种麦角菌发酵物中各种麦角生物碱的含量。操作簡便,有机溶剂用量很少。

     
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