共查询到20条相似文献,搜索用时 718 毫秒
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Mathmatica语言具有良好的环境,处理数据速度好,拟合的曲线准确生动,在物理实验中有很好的用途。本文给出了用Mathmatica语言处理铁磁材料基本磁化曲线和磁滞回线实验数据的处理过程,结果精确,效果非常好。 相似文献
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牛顿环实验中数据处理方法及结果的评价 总被引:3,自引:0,他引:3
本文用牛顿环实验中的实测数据,以两种不同的数据处理方法,来评价结果的好坏.一、用还差法处理实验数据此法在现行教材中较通用.考虑到玻璃弹性形变引起的系统误差,不直接用牛顿环的直径D(k)去计算平凸透镜凸面的曲率半径R,而是采用逐差法.通过。个相邻暗环直径平方差D\b十。)一D’(k)的算术平均值来计算R表1是一组用读数显微镜测得的数据和用逐差法处理的结果.二、加权平均法处理由于中测量是非等精度的,而方法一处理数据时则忽视了这一点.按照严格的数据处理理论,对于非等精度测量,其实验数据应用加权平均的方法处理… 相似文献
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对牛顿环实验中不等精度测量数据的处理 总被引:9,自引:1,他引:8
据笔者了解,目前各高等院校对牛顿环实验的数据,基本上都是在假设干涉条纹为均匀分布条件下,应用逐差法来处理,并在此基础上分析误差”‘、”’.本文对牛顿环实验中不等精度测量的数据用最小二乘法给出了较为合理的处理.一、牛顿环实验是不等精度测量大家知道,在牛顿环实验中,反射光第k级干涉暗纹半径满足关系其中,R为待测透镜的曲率半径,A为人射单色光波长.公式表明了与成正比,有即干涉条纹随级数的增大愈来愈密,愈来愈细.因此,该测量是非线性不等精度测量.二、用还差法处理数据存在的问题在用逐差法处理数据时有公式表明… 相似文献
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牛顿环实验数据处理方法分析 总被引:5,自引:0,他引:5
用不同的数据处理方法对牛顿环实验进行数据处理与分析,讨论各种方法的益处与缺陷,提出学生实验用逐差法处理牛顿环实验的数据是实用可行的,并说明用计算器进行线性回归处理牛顿环实验的数据是值得推荐的一种方法. 相似文献
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测得实验数据后进行数据处理,找出物理量之间的关系·,从而揭示物理规律,进行误差分析,是每个探究实验所必经的过程.用图像法处理、分析实验数据是物理实验探究中常用的方法.线性关系图像能形象直观地表达物理规律,有效地减少偶然误差对实验结果的影响,能方便地分析实验误差,获得未经测量或无法直接测量的物理量,在实验探究中有广泛的应用. 相似文献
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长期以来高中物理实验的数据多是用手工进行处理的.由于某些实验数据处理比较繁琐,时间浪费在重复劳动上,学生得不到科学方法的训练当前计算机处理信息的智能化、高速度,为数据处理提供了广阔的应用空间.因此,实现物理实验教学现代化,用计算机辅助处理高中物理实验数据是可行的.Microsoft Excel软件的数据处理界面比较贴近中学物理实验数据处理的实际,只要设计恰当, 相似文献
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以单摆测量重力加速度实验的数据处理为例,探讨了用Matlab语言对物理实验数据进行最小二乘法的处理。与传统的实验数据处理方法相比,用Matlab处理物理实验数据准确快捷,能有效避免手工处理带来的误差,Matlab的可视化功能也可以更加直观地反映实验结果,适合在实验教学中应用。 相似文献
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The occurrence of digits 1 through 9 as the leftmost nonzero digit of numbers from real-world sources is distributed unevenly according to an empirical law, known as Benford's law or the first digit law. It remains obscure why a variety of data sets generated from quite different dynamics obey this particular law. We perform a study of Benford's law from the application of the Laplace transform, and find that the logarithmic Laplace spectrum of the digital indicator function can be approximately taken as a constant. This particular constant, being exactly the Benford term, explains the prevalence of Benford's law. The slight variation from the Benford term leads to deviations from Benford's law for distributions which oscillate violently in the inverse Laplace space. We prove that the whole family of completely monotonic distributions can satisfy Benford's law within a small bound. Our study suggests that the origin of Benford's law is from the way that we write numbers, thus should be taken as a basic mathematical knowledge. 相似文献
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Lijing Shao 《Physica A》2010,389(16):3109-3116
The occurrence of the nonzero leftmost digit, i.e., 1,2,…,9, of numbers from many real world sources is not uniformly distributed as one might naively expect, but instead, the nature favors smaller ones according to a logarithmic distribution, named Benford’s law. We investigate three kinds of widely used physical statistics, i.e., the Boltzmann-Gibbs (BG) distribution, the Fermi-Dirac (FD) distribution, and the Bose-Einstein (BE) distribution, and find that the BG and FD distributions both fluctuate slightly in a periodic manner around Benford’s distribution with respect to the temperature of the system, while the BE distribution conforms to it exactly whatever the temperature is. Thus Benford’s law seems to present a general pattern for physical statistics and might be even more fundamental and profound in nature. Furthermore, various elegant properties of Benford’s law, especially the mantissa distribution of data sets, are discussed. 相似文献
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《中国物理 B》2021,30(5):54201-054201
We present a ghost handwritten digit recognition method for the unknown handwritten digits based on ghost imaging(GI) with deep neural network, where a few detection signals from the bucket detector, generated by the cosine transform speckle, are used as the characteristic information and the input of the designed deep neural network(DNN), and the output of the DNN is the classification. The results show that the proposed scheme has a higher recognition accuracy(as high as98% for the simulations, and 91% for the experiments) with a smaller sampling ratio(say 12.76%). With the increase of the sampling ratio, the recognition accuracy is enhanced. Compared with the traditional recognition scheme using the same DNN structure, the proposed scheme has slightly better performance with a lower complexity and non-locality property.The proposed scheme provides a promising way for remote sensing. 相似文献
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用Java Applet编写大学物理实验数据处理软件 总被引:2,自引:0,他引:2
本文介绍了用Java语言编写的大学物理实验数据处理软件,此软件实现简单、操作方便、人机交互界面友好,且程序容易实现Web化。 相似文献
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Lip contour tracking is an integral part of lip reading application. Fast and accurate lip tracking is an important step in lip reading. This paper uses a novel active contour model for lip tracking and proposes geometrical feature extraction approach for lip reading. Effect of individual features are compared and a joint feature model is obtained by combining weighted decision obtained by a feature vector of difference in inner area, height and width of lip. Ergodic hidden markov model (HMM) is used as a classifier. For each digit Markov Model is tested for 3 states and 5 states. Videos of English digit from 0 to 9 have been recorded for recognition test. Cuave database is used for comparison along with an in-house database. While doing computation of feature vectors, only significant frames are used to reduce the computation complexity. Results of experimentations on digit utterances are given to show that the maximum recognized digit can be used for important programming command of computerized numerical control machines. 相似文献
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介绍了水下目标激光探测高速数据采集系统设计的技术难点,设计了一种基于高速CMOS模/数转换芯片和高性能StratixⅡFPGA高速数据采集芯片的水下激光信号实时采集与传输系统,信号采集速率可达1GHz。系统的适用性及可靠性在水下目标激光探测试验中得到了验证。 相似文献