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sampling     
相关语句
  采样
     Radar Digital Waveform Generation Research Based on IF Sampling Technique
     一种基于中频采样的雷达数字波形产生方法研究
短句来源
     Research on Theory and Error of Analog Digital and Mixed Sampling Power Measurement
     模拟、数字及混合采样功率测量的理论与误差研究
短句来源
     Study on the Algorithms of DCT-Ⅱ Coefficients Based Image Sampling Rate Conversion and Its Architecture Design
     基于DCT-Ⅱ系数的图像采样率变换的算法研究及其结构设计
短句来源
     Research on Pre-computation and Sampling Based Real-time Realistic Image Rendering Technology
     基于预计算及采样的实时高真实感图像绘制技术研究
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     Spectrum Analysis of Non-uniformly Sampling Signal of Track Irregularities
     轨道不平顺非均匀采样信号谱分析
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  抽样
     QUADRATIC COLLISION PROBABILISTIC METHOD AND IMPORTANCE SAMPLING METHOD OF MONTE CARLO CALCULATION FOR FLUX AT A POINT
     蒙特卡罗计算点通量的二次碰撞概率方法和重要抽样方法
短句来源
     PRIMARY STUDIES ON THE DISTRIBUTION PATTERN AND METHODS OF SAMPLING OF THE SOYBEAN AGROMYZID FLY MELANAGROMYZA SOJAE(ZEHNTER)
     豆秆黑潜蝇Melanagromyza sojae(Zehnter)田间分布型与抽样方法的初步研究
短句来源
     A STUDY OF CONTINUOUS FOREST INVENTORY (CFI) BY POINT SAMPLING
     用点抽样进行森林连续清查的研究
短句来源
     RESEARCH ON SAMPLING TECHNIQUES OF ADULTS OF GREENHOUSE WHITEFLIES (TRIALEURODES VAPORARIORUM WESTW.)
     溫室白粉虱(Trialeurodes Vaporariorum Mestw.)成虫的抽样技术研究
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     Random Sampling
     随机抽样
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  取样
     High Speed Optical Sampling Technique and Applications
     高速光取样技术及应用
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     Studies on the Embryos Production Completely in Vitro and the Sampling Methods in Embryo-sex-identification in Bovine
     牛完全体外生产胚胎及胚胎性别鉴定取样方法研究
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     Analysis on Sampling Complexity of Association Rule Mining
     关联规则挖掘的取样复杂性分析
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     THE STUDY OF TRANSIENT RESPONSE OF OPEN-LOOP VARIABLE-PARAMETER SAMPLING OSCILLOSCOPE
     开环变参量取样变換过程过渡特性的研究
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     A TRANSISTOR SAMPLING OSCILLOSCOPE WITH A BANDWIDTH GREATER THAN 1000 Me
     频宽1000兆赫的晶体管取样示波器
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  采集
     Signal Sampling and Transformation on Real Time Separation for Radar Repetition Period
     雷达重复周期实时分选中的信号采集与变换
短句来源
     The Application of Microcomputer in Sampling and Spectrum Analysis for Measuring the Error of Mechanical Gear Drive Chain
     微型机在机械传动链误差采集与频谱分析中的应用
短句来源
     THE APPLICATION OF TP801 MICROCOMPUTER TO SAMPLING AND PROCESSING THE DATA AUTOMATICALLY IN TENSION TEST OF MATERIAL
     TP801单板微机在材料拉伸试验中数据自动采集处理的应用
短句来源
     Development of an Automatic Data Sampling and Processing System in on Instrument for Measuring Temperature Coefficient of Retractive Index
     折射率温度系数测定仪中数据自动采集处理系统的研究
短句来源
     Theory and Application of Information Sampling on Parttern Picture of Jacquard Fabric
     提花织物花型图片信息采集理论与其应用
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  sampling
Aliasing and Poisson Summation in the Sampling Theory of Paley-Wiener Spaces
      
Functions belonging to various Paley-Wiener spaces have representations in sampling series.
      
When a function does not belong to such a space, the sampling series may converge, not to the object function but to an "alias" of it, and an aliasing error is said to occur.
      
Aliasing error bounds are derived for one- and two-channel sampling series analogous to the Whittaker-Kotel'nikov-Shannon series, and for the multi-band sampling series, and a "derivative" extension of it, due to Dodson, Beaty, et al.
      
Iterative Reconstructions in Irregular Sampling With Derivatives
      
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In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and...

In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and their com-ponents are discussed. In the last part of the paper methods of compensating sampled data systems with dead time elements is also considered.

在通常的脉冲控制系统中,当输入信号是阶跃函数时,系统的过渡过程至少在n个采样周期内才能完全结束(n是控制对象的阶数).文中考虑了采用宽度不等的多拍脉冲代替通常的单拍脉冲以加快系统的过渡过程.在采用多拍脉冲以后,系统的过渡过程可以在少于n个采样周期内,甚至在一个采样周期内完全结束.文中叙述了这种脉冲系统的综合方法,也讨论了系统中有关组成部分——脉冲组成器和校正装置——的构成方案及其参数的计算方法.最后并考虑了由于时滞引起的对系统动态特性有害影响的补偿问题.文中举有例题,对文中各节内容作必要的说明.

In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial distributions....

In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial distributions. The larval population during hibernation period appears to be neither of the random distribution norof the contagious type but agrees with the negative binomial distribution. The population distribution of the injured stems, characterized by the ap-pearance of "dead-hearts" and "white ears" was also studied. The "dead-hearts"popolation in autumn-crop fields conforms with the contagious and the negativebinomial distribution. The distribution of the "white ears" is not at random. It iseither in essential agreement with the contagious or with the negative binomialdistribution, depending on the size of the sampling unit. Based on the form of population distribution the questions of sampling tech-nique, the design of field experiments, the transformation of data for statisticalanalysis, as well as the habits and control of insects have been discussed inrelation to the rice stem borer. Since the populations of larvae and "whiteears" differ significantly from the random distribution, a new technique forsampling has been proposed. It is hoped that this may be useful in the investi-gations on the relative effectiveness of control operations and for census purposes.

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分...

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分布型式成为不必要的,因为极度的不均衡会回复为均衡状态的。

The study of the distribution of hydrogen in steel ingots, despite its practical importance, has not received due attention from previous workers. Available experimental results are mainly fragmentary and non-systematic, and therefore many disputable opinions exist. Desirous of investigating this problem in greater details, the authors employed several annealed ingots of high chromium steels which were considered to be particularly suitable because they evolved little gas at room temperature and consequently...

The study of the distribution of hydrogen in steel ingots, despite its practical importance, has not received due attention from previous workers. Available experimental results are mainly fragmentary and non-systematic, and therefore many disputable opinions exist. Desirous of investigating this problem in greater details, the authors employed several annealed ingots of high chromium steels which were considered to be particularly suitable because they evolved little gas at room temperature and consequently the inherent difficulty to avoid the loss of hydrogen during sampling was, to a very large extent, overcome. For this purpose also, suitable apparatus capable of determining relatively small amount of hydrogen was constructed. The results obtained show that the hydrogen distribution in the annealed ingots follows a significant and regular pattern, thus dismissing certain misgiving conclusions based on contradictory results given by previous workers. Although the average hydrogen content of the anealed ingots amounted to not more than half that of the liquid stael, yet in certain parts of their interior the local hydrogen content was found to be higher than that of the liquid steal. This affirms the existence of hydrogen segregation in steel ingots. Moreover, from maps of hydrogen contour lines drawn for the ingots it can be seen that the regions of the highest hydrogen content roughly coincide with the last solification. Indeed, the effect due to certain external irregularities encountered in the course of solification is detectable rather from the hydrogen maps than by the usual method of macro-etching.In the longitudinal or the transverse direction of the annealed ingots, the general trend of hydrogen variation based on average hydrogen content is shown to be governed by the law of hydrogen diffusion. Further examinations reveal that the ingot structure and its internal porosity exert considerable influence upon the distribution. It is likely that hydrogen diffusion may be faster in columnar crystals than in equi-axed crystal regions. The presence of porosities in ingots seems to retard the removal of hydrogen. Such implications have not been sufficiently realized in the past.Based on the discussion of the experimental results, certain immunizing treatment suitable for preventing hairline cracks in certain types of steel is explained.

氢在鋼锭中的分佈是一个具有重要实际意义的问题,但在过去未得到研究工作者足够的重视.本文利用高铬型合金鋼在常温下不损失氢的特点,并建立了適宜的半微量定氢装置,对退火后的鋼锭中各个部位进行了定氢试验。结果证明,氢在鋼锭中的分佈是具有规律性的,指出了前人根据不全面的实验结果所提出的错误结论. 经过退火处理后的鋼锭,其平均含氢量虽然只及原来钢液含氢量的一半,伹在某些局部其含氢量反而高於钢液.这说明钢锭中确有氢的偏析现象存在.根据等氢曲线的分布情况来看,钢锭中氢偏析严重之处大致与最后凝固的部分相符.凝固过程中钢锭一面受到中注管散热的影响,也能从等氢曲线的分佈情况反映出来,而这种影响从低倍检验结果来看是没有能够觉察到的. 从氢含量变化的平均趋势来看,退火钢锭中的氢分佈不管是沿横方向抑是沿縱方向都服从於扩散规律,伹必须考虑到结晶构造和内部缺陷的影响.譬如,沿柱状晶轴方向的氢扩散似乎比等轴晶区域内的氢扩散速度大,而钢锭中心疏松对於去氢则起阻碍作用,过去对於这些方面的了解是不够的. 根据上述结果的分析讨论,本文还为某种防止钢中白点的热处理方法提供了理论上的解释.

 
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