随机向量间的线性相关性度量

相关分析是描述两个或两个以上变量间关系密切程度的统计方法.本文主要讨论随机向量间的相关性,重点地讨论了总体简单相关系数、复相关系数和典型相关系数的计算过程,以及广义相关系数与上三者之间的关系.     

基于损失分布模型的操作风险相关性及算法

根据新巴塞尔协议关于银行操作风险计量的基本框架,讨论了高级计量法下不同产品条线/风险类型单元的操作风险之间的相关性问题,并运用损失分布模型计算不同单元的操作风险累计损失之间的相关系数,尝试用Copula算法来计算相关系数矩阵,并将结果应用于操作风险资本配置.     

全椒县初中生“国家学生体质健康标准测试”抽查复核一致性研究

检验全椒县青少年体质测试的真实性.抽取全椒县三所初中进行体质测试.结果表明:大墅中学初一学生上报体重与复核体重、上报肺活量与复核肺活量、上报左眼视力与复核左眼视力三项测试的相关系数较低,其余指标相关系数均高于0.803;南屏中学初二学生复测结果除视力没有复测外,其余指标相关性均很高;全椒三中复测男生1 000米跑相关系数较低,三所中学大部分体质测试指标上报结果与复测结果一致性很高.     

参数族阿基米德Copula的尾相关性

本文讨论了生成元为双参数情形的二维阿基米德Copula的尾相关系数,以及高维单参数族和双参数族情形．而且对于二维和高维的尾相关系数进行比较．     

柴油与发动机排放关系的多元分析方法研究

应用相关性分析方法和逐步回归方法分析了柴油的组分和性质与发动机的排放之间的相关性，求得了相应的相关系数和回归方程。计算和实验结果表明，相关系数较在的因子对发动机的排放的影响也较大，使用相关系数较大的因子进行回归分析时，可以得到较高的拟合精度，简化计算过程。     

流线型箱梁断面涡激力展向相关试验研究

针对闭口流线型主梁结构涡激力展向相关性问题,在均匀流场条件下分别对振动状态和静止状态流线型主梁节段模型进行了不同风攻角的涡激力展向相关性试验研究,分别分析了流线型主梁断面涡激振动响应、涡激力展向相关性及主梁表面压力等.结果表明:振动状态主梁断面涡激力展向相关系数与振幅、锁定区风速等相关,锁定区上升段主梁断面涡激力展向相关系数大于锁定区最大振幅处主梁断面涡激力展向相关系数,扭转涡振锁定区升力矩展向相关系数大于竖向涡振锁定区竖向涡激力展向相关系数;振动状态主梁断面测点压力系数展向相关系数与振幅相关,振幅越大则相关系数越大.     

SUFR系统中微生物菌群生态功能的试验分析

对螺旋升流式反应器(Spiral Up-Flow Reactor,SUFR)系统中微生物的数量分布以及与主要水质指标的相关性进行了试验研究,结果表明:SUFR系统中的微型动物种群较多,微生物生态系统稳定;系统中微生物的数量与营养盐的含量密切相关,其中总异养菌与COD的相关系数r为0.949,有机磷细菌与TP的相关系数r为0.815,亚硝化菌与NH3-N的相关系数r为0.909,反硝化菌的数量和TN的相关系数r为0.653.     

几乎共线性的度量问题

本文考虑回归分析和数值相关分析等领域中的向量相关性的度量问题,引进一种用于度量共线性影响的数量指标,并讨论了它的基本性质以及与病态条件数和复相关系数的关系.     

复值随机变量的协方差与相关性

通过讨论复值随机变量的协方差与相关系数的若干性质，得到了复值随机变量以概率1线性相关的充要条件。     

利用新的价连接性指数估算醇类化合物Kováts指数

以连接性指数为结构描述符,用多元回归技术建立了醇类化合物的结构与色谱保留值的相关性模型,各样本总体所建模型的相关系数均在0.98以上,这些模型较好地解释了醇类化合物保留指数的递变规律.为了检验模型的稳定性和预测能力,进行了留一法交互校验,相关系数均在0.98以上.该模型相关系数高,稳定性好,预测能力强.     

Nucleation and growth mechanism of ferroelectric domain-wall motion

The motion of domain walls is critical to many applications involving ferroelectric materials, such as fast high-density non-volatile random access memory. In memories of this sort, storing a data bit means increasing the size of one polar region at the expense of another, and hence the movement of a domain wall separating these regions. Experimental measurements of domain growth rates in the well-established ferroelectrics PbTiO3 and BaTiO3 have been performed, but the development of new materials has been hampered by a lack of microscopic understanding of how domain walls move. Despite some success in interpreting domain-wall motion in terms of classical nucleation and growth models, these models were formulated without insight from first-principles-based calculations, and they portray a picture of a large, triangular nucleus that leads to unrealistically large depolarization and nucleation energies. Here we use atomistic molecular dynamics and coarse-grained Monte Carlo simulations to analyse these processes, and demonstrate that the prevailing models are incorrect. Our multi-scale simulations reproduce experimental domain growth rates in PbTiO3 and reveal small, square critical nuclei with a diffuse interface. A simple analytic model is also proposed, relating bulk polarization and gradient energies to wall nucleation and growth, and thus rationalizing all experimental rate measurements in PbTiO3 and BaTiO3.     

Similarity Measurement of Web Sessions Based on Sequence Alignment

The task of clustering Web sessions is to group Web sessions based on similarity and consists of maximizing the intra-group similarity while minimizing the inter-group similarity. The first and foremost question needed to be considered in clustering Web sessions is how to measure the similarity between Web sessions. However, there are many shortcomings in traditional measurements. This paper introduces a new method for measuring similarities between Web pages that takes into account not only the URL but also the viewing time of the visited Web page. Then we give a new method to measure the similarity of Web sessions using sequence alignment and the similarity of Web page access in detail Experiments have proved that our method is valid and efficient.     

Laser cooling and real-time measurement of the nuclear spin environment of a solid-state qubit

Control over quantum dynamics of open systems is one of the central challenges in quantum science and engineering. Coherent optical techniques, such as coherent population trapping involving dark resonances, are widely used to control quantum states of isolated atoms and ions. In conjunction with spontaneous emission, they allow for laser cooling of atomic motion, preparation and manipulation of atomic states, and rapid quantum optical measurements that are essential for applications in metrology. Here we show that these techniques can be applied to monitor and control individual atom-like impurities, and their local environment, in the solid state. Using all-optical manipulation of the electronic spin of an individual nitrogen-vacancy colour centre in diamond, we demonstrate optical cooling, real-time measurement and conditional preparation of its nuclear spin environment by post-selection. These methods offer potential applications ranging from all-optical nanomagnetometry to quantum feedback control of solid-state qubits, and may lead to new approaches for quantum information storage and processing.     

深化公有制与市场经济结合的认识理解

公有制与市场经济的结合，是在邓小平理论指导下，建设具有中国特色社会主义经济的伟大创举，对两的结合及如何有效结合，谁适应谁等一些问题，有必要进一步研讨，深化认识，本首先在概略阐述两结合的形成及其促进生产力与经济快速增长的基础上，重点就相关问题，提出一些看法。     

Changes in EEG measurements in intractable epilepsy patients with neurofeedback training

To assess the effects of neurofeedback on brain electrophysiology and to determine how biofeedback works, power spectral density (PSD) and approximate entropy (ApEn) analyses are applied to the EEGs of six patients with intractable epilepsy who received neurofeedback training. After sessions of treatment, the EEG sensorimotor rhythm to theta PSD ratio calculated from the C4 electrode site becomes larger than that before the treatment, which is consistent with the biofeedback protocol. The ApEn over 16-channel EEG recordings all increase to different degrees. Larger increases occur in channels located near the training position (C4). All these results suggest that these EEG measurements are new criteria that can be used to evaluate the effect of neurofeedback.     

Experimental one-way quantum computing

Standard quantum computation is based on sequences of unitary quantum logic gates that process qubits. The one-way quantum computer proposed by Raussendorf and Briegel is entirely different. It has changed our understanding of the requirements for quantum computation and more generally how we think about quantum physics. This new model requires qubits to be initialized in a highly entangled cluster state. From this point, the quantum computation proceeds by a sequence of single-qubit measurements with classical feedforward of their outcomes. Because of the essential role of measurement, a one-way quantum computer is irreversible. In the one-way quantum computer, the order and choices of measurements determine the algorithm computed. We have experimentally realized four-qubit cluster states encoded into the polarization state of four photons. We characterize the quantum state fully by implementing experimental four-qubit quantum state tomography. Using this cluster state, we demonstrate the feasibility of one-way quantum computing through a universal set of one- and two-qubit operations. Finally, our implementation of Grover's search algorithm demonstrates that one-way quantum computation is ideally suited for such tasks.     

使用化学导学案 提高化学教学效率

导学案的实施是实施新课改,落实新教材,提高课堂教学质量的有效途径.导学案注重围绕构建学生良好的认知结构,导学案的实质是教师指导学生自主探究、感悟和发展的过程.以期通过有序训练,达到提高学生主动求知、自主获取知识的能力,全面促进学生实践能力和创新能力的提高.     

新理念 新教材 新要求——教学中实施新教材的几点思考

如何在新课程实施中,领悟课程要领,掌握教学方法,更好地胜任化学新教材的教学,这需要我们不断思考,从更新观念,钻研教材,研究教法出发,逐步完成自身在教学中的定位.     

发展生态旅游的思考

在旅游经济迅速发展的今天 ,越来越多的人们崇尚回归自然 ,从而引发了生态旅游这一崭新的旅游形式和理念。本文通过对与生态旅游有关的几个方面的分析 ,深入探讨了生态旅游的含义 ,为何要发展生态旅游以及如何发展。从而为开展生态旅游提出自己的观点。     

Measurements and Terminology of Different Measure Methods

Body measuring is very important for garment sizing and pattern making. In this paper, we study the difference of the landmarks between the traditional method and 3D scanner and we also select the 19 circumference measurements, 29 height and length measurements, 18 breadth and depth measurements＇and 3 other measurements, which are quite important in fashion body measuring, to compare the terminology of them in these two measuring method. 3D scanners seem better than the traditional method on these aspects, which are the number of measurements, speed, privacy and data accuracy, but they are limited on measuring posture. And there is no uniform standard for the scanners and the definitions of the measurements in the scanners are diversified.