The DWT power spectrum analysis of the large scale structure in the universe : Method and simulation tests

Based on the discrete wavelet transformation ( DWT), we present a pixelized method of estimating the power spectra of galaxy samples. With local properties of wavelet both in physical and wavenumber spaces, DWT power spectrum is equal to the corresponding band average of Fourier power spectrum. The DWT estimator is optimized in the sense that the spatial resolution is adaptive automatically to the perturbation wavelength to be studied. Under the assumption of ergodicity, the spatial average of local DWT fluctuation modes provides a fair estimation of the ensemble average. We test DWT spectra of four typical cold dark matter (CDM) structure formation models with numerical simulations. To consider the infections of various observation effects to the DWT spectra, we introduce irregular survey geometries, a given sampling rate, radial selection effects and redshift distortion effects into our mock samples. The numerical results show that, owing to its local properties, DWT spectrum is less affected by the sampling rate, survey geometry, and statistical ensemble fluctuations. With fast wavelet decomposition algorithm, DWT can be used to analyze large survey samples, which is of direct significance in precise measurement of the cosmological parameters from the galaxy redshift surveys of next generation.     

200例乙型肝炎病毒感染者对乙肝预防认知情况调查

为了解乙型肝炎病毒（HBV）新感染人群对乙肝预防的认知情况,对2000年7月－12月在本院就诊的200例HBV感染者做了调查,发现未注射疫苗的人群,94．5％是因对乙肝预防认知程度差所致,其中地区、职业、文化程度的差异是影响认知程度的重要因素。因此,加大对预防工作的投入,加强宣传教育,特别是在我省专州地县、偏远山区,是控制HBV感染的首要途径。     

PPS抽样──一种有效的水路运输量抽样方法

本文针对水运运输特点，通过对实际资料的分析和计算，对水运运输量的抽样方法作分析比较，提出利用ＰＰＳ抽样进行我国水路运输量的抽样抽查。     

A new approach to assessing the performance of noise indices in buildings

The results of a wide acoustic environment survey are presented. Sound pressure measurements were carried out in a group of offices. These measurements lasted for five minutes and the resulting noise spectra were used to calculate the most significant acoustic parameters. During each measurement a questionnaire was administered to workers near each measuring position. The questionnaire asked them to indicate their subjective judgement about noise annoyance, noise loudness and dissatisfaction induced by noise present in the environment. The aim of the research was to investigate the performance of the measured noise indices in describing subjective responses to noise. A new method to calculate the average subjective responses is proposed. The performance of the noise indices was studied by means of linear regression analysis. Finally the A-weighted equivalent sound pressure level proved to be the best index among those analysed in describing subjective auditory sensations.     

GPS测姿技术在航天测量船的应用分析

简要介绍了航天测量船测姿系统的特点,概要分析了GPS测姿技术的原理,着重论述了GPS测姿技术在测量船上应用的可行性。     

飞机姿态测量误差对测量船校飞精度的影响

通过对校飞数据处理方法及实测数据的分析,阐述了飞机姿态测量误差对测量船校飞精度的影响,并针对校飞飞机的姿态测量提出了新的方法。     

求解资源约束项目调度问题的启发式算法综述

本文综述了求解RCPSP的启发式算法.首先在对各种优先权规则进行归纳的基础上,概述基于优先权规则的RCPSP启发式算法研究现状;其次,综述项目进度的表述方式及常用超启发式策略,汇总求解RCPSP的超启发式算法的研究成果.此外,简要介绍除上述两大类启发式算法之外的其他几种启发式算法;最后,对全文进行总结,并指出该领域几个有希望的研究方向.     

“中国家庭经济与生育研究”抽样调查方案及目标量估计方法

本文论述了“中国家庭经济与生育研究”全国抽样调查中用聚类方法对全国２５省（市、区）和农村发达与落后地区进行分层,并采用多阶多次分层抽样;给出了在此方案下各层次目标量的估计方法和估计公式的变换形式．     

二维平衡单水平轮换设计及其广义组合估计方法研究

针对国内外现行单水平轮换调查存在的一系列问题,本文提出二维平衡单水平轮换模式设计及其广义组合估计方法。在这套设计方法中,将轮换偏差和两类相关关系引入到广义组合估计量公式中,提高了估计量的准确性,同时在连续性的多目标调查下还应用最优化方法确定一套最优权重系数,使得抽样调查的整体精度达到最高,同时又能够调整权重,满足各类目标量精度高低的要求。这套系统化、理论化的设计方法将为我国今后更好地开展各类单水平轮换调查提供理论指导。     

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采用精密工程测量技术对EAST装置主机关键部件装配位置进行了装配过程检测，并建立了相应的测量控制网。通过利用合适的控制测量方案，使得EAST装置关键部件的装配位置精度达到了设计要求。