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Statistical analyses.of metric data of hominoid teeth found in Yuanmou of China

Chinese Science Bulletin 2000年第10期45卷 936-942页

作者： LIU Wu, ZHENG Liang & JIANG Chu1. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China 2. Institute of Archaeology of Yunnan Province, Kunming 650118, China 3. Yuanmou Man Museum, Yuanmou 651300, China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China Institute of Archaeology of Yunnan Province Kunming China Yuanmou Man Museum Yuanmou China

Mesial-distal and buccal-lingual dimensions of 1 266 hominoid teeth found in Yuanmou of Yunnan Province during the period of 1986 and 1988 have been measured. The statistical analyses.of the metric data show that the tooth sizes of Yuanmou hominoid can be divided into big and small two types, and most tooth dimensions display obvious bimodalities in both histograms and 2 dimensional plots. The coefficients of variance (CV) reveal that the CVs of Yuanmou hominoid tooth sizes are within or close to the CV ranges of Lufengpithecus and extant great apes. The comparisons of tooth sizes and their proportions indicate that Yuanmou hominoids have close affinities with Lefeng and Kaiyuan hominoids, and have obvious differences with Gorilla, Chimpanzee and Orangutan. The authors believe that the hominoid fossils found in Yuanmou in the past 10 years represent a single species with highly sexual dimorphism in morphology and this species may have a close evolutionary relationship with the hominoids found in

关键词： human origin Yuanmou hominoid dental metrics statistical analyses.

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Experimental Study on the Dynamic Characteristics of a Gas Turbine Combustor Burning Syn-gas

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Journal of Thermal Science 2004年第4期13卷 376-381页

作者： Yu Lei Gang Xu Aibing Fang Chaoqun Nie Weiguang Huang Chinese Acad Sci Inst Engn Thermophys Beijing 100080 Peoples R China

The present study focused on the development of a full-scale gas turbine combustor burning syn-gas from the coal-based multi-production. The dynamic features of a variety of parameters of the combustor, such as temperature and pressure during the procedures of startup and thermal load shifting, were measured and analyzed. The frequency and power spectrum of pressure fluctuation were analyzed by applying FFT and 1D continuous MORLET wavelet methods. The results show that the pressure fluctuation has distinct patterns during startup and load-transition procedures. The relationship between these dynamic features and the stability, safety and efficiency of gas turbine combustors burning syn-gas are preliminarily discussed.

关键词： gas turbine combustor dynamic characteristics frequency and power spectrum analyses.

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AN INVESTIGATION OF MODELLING ON DRAFTING PROCCES OF WOOLLEN GILL MACHINE

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Journal of China Textile University(English Edition) 1993年第2期10卷 29-33页

作者：周旭东 Dept of Mechanical Engineering

The combing process of gill machine is an important link in the wool spinning *** to improve the quality of products,it is necessary to study the new autoleveling device whichuses the modern control theory and microcomputer *** have to set up a mathematicalmodel for object:As the woolen yarns (both input and output) are complex random process,it issuitable for CARMA (controlled autoregressive-moving average) to describe the object by meansof time series analyses.of models.

关键词： Wool spinning machinery Gilling machine identification Drafting process autoleveller time series analyses.

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