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Search Results: 1 - 10 of 463752 matches for " <br>刘丽 "
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STUDY OF RESONANT FREQUENCY CHARACTERISTIC OF DIELECTRIC COAXIAL RESONATORS
分层同轴介质谐振器谐振频率特性的研究

Liu Lihua,<br>
电子与信息学报 , 1993,
Abstract: The TE and TM mode field expressions and their general coupled characteristic equations of the dielectric coaxial resonators (any number of interfaces) placed between two parallel conducting plates or placed in shield are derived. Particularly, the dielectric coaxial resonator (three interfaces) is studied and calculated in detail. And curves and tables of dominant mode and some higher-order modes resonant frequencies varied with the resonantor geometry and dielectric properties are given
Hail detection by using frequency-shift single radar system
变频单波段雷达方法识别冰雹云

Liu Jinli,<br>
大气科学 , 1988,
Abstract: 为了探计用改变单波段雷达工作频率的方法识别冰雹云,对于C波段(取5.56cm波长)和S波段(取10.7cm波长)雷达,分别改变其工作频率400MHz和200MHz,计算了相应变化频率两端的那些波长情况下,三种冰雹模式(纯冰球、带水膜冰球、冰水混合球),两种冰雹谱分布型式(匀谱与指数谱)的雷达反射率因子。对于这两种波段的雷达,分别考察其长波长的雷达反射率因子与短波长的雷达反射率因子之比和冰雹直径之间的变化关系。结果表明,在一定的条件下,两种雷达都能够识别一定尺度范围的冰雹,而且以S波段雷达指数谱情况的结果最
RIGHT EAR ADVANTAGE FOR MANDARIN TONE PERCEPTION AND ITS MECHANISM:A DICHOTIC LISTENING STUDY
汉语普通话声调加工的右耳优势及其机理:一项双耳分听的研究

Liu li,Peng Danling,<br>,彭聃龄
心理学报 , 2004,
Abstract: In dichotic listening, a right ear advantage reflects left hemisphere specialization, and a left ear advantage reflects right hemisphere specialization. A dichotic listening task was used to investigate the brain lateralization of Mandarine tone. A response hand factor was manipulated to distinguish direct access and callosal relay explanations of perceptual asymmetry of Mandarine tone. The results indicated a right ear advantage or left hemisphere superiority for the perception of Mandarine tone and supported direct access model in the perception of Mandarine tone.
STRUCTURE OF CHILDREN''''S TEMPERAMENT AGED 3 TO 9 BASED ON TEACHERS'''' DESCRIPTIONS
基于教师评定的3~9岁儿童气质结构

Liu Wen,Yang Lizhu,<br>,
心理学报 , 2005,
Abstract: 该研究采用理论推导、开放式问卷和个案追踪相结合的方法,对744名3~9岁儿童的气质进行理论建构,自编儿童气质教师问卷,采用AMOS技术进行验证性因素分析,对3~9岁儿童气质结构进行研究。结果表明,3~9岁儿童气质是由情绪性、活动性、反应性、社会抑制和专注性五维度组成的多维整体;研究所编制的3~9岁儿童气质教师评定问卷具有较好的信度和效度。
INFLUENCE ON THE SIMILARITIES IN SUPERFICIAL CONTENTS ON THE COURSE OF ANALOGY TRANSFER OF PROBLEM SOLVING
样例表面内容对问题解决类比迁移过程的影响

Mo Lei,Liu Lihong,<br>莫雷,
心理学报 , 1999,
Abstract: The influence of the different superficial similarities between the new problem andthe earlier example, with or without the same principle, on the analogy transfer werestudied. In Experiment 1, the subjects were asked to leam the examples on theprobability and solve the new problems which were similar in varying degree insuperficial contents with the exampes. The result showed:(1)The superficial similaritieshad great advance in solving the new problem when the new problem and the earierexample had the same principle. The similarity in superficial line would accelerate thesubjects to classify the new problem, and the similarity in superficial correspondencewould ascelerate the subjects to make correct use of the formula. (2)When the newproblem and the earier example had different principle, the similarities in thesuperficial contents of both would have a negative transfer in classifying the newproblem. In Experiment 2, the subjects were given a cue to pay attention to theprinciple of the problems before they solved the new problems. The results showedthat the subects would be accelerated to cap on the inner analogy and raise theirperformance. According to the results, it was proved preliminarily that it was animportant factor influencing the level of analogy transfer whether the subjects had thetendency to analogizing ascording to the inner principle.
On Management and Evaluation of Network Stations of Journals
浅谈期刊网站管理及评价系统

LIU Ying,ZENG Li,<br>,
中国科技期刊研究 , 2009,
Abstract: 期刊网站管理的特征主要体现在期刊网站管理软件开发、网站的增值功能管理、期刊网络化编辑人才的培养等.期刊网站评价从网站的内容、技术、管理、网络影响因子和在线使用统计等方面来进行.
Electronic structures and transport properties of BN nanodot superlattices of armchair graphene nanoribbons
掺有BN纳米点石墨烯纳米带的电子结构和输运性质的第一性原理研究

An Liping,Liu Nianhua,<br>安,念华
半导体学报 , 2011,
Abstract: 利用第一性原理研究了含有BN纳米点的扶手椅型石墨烯纳米带的电子结构和输运性质。研究发现,能带结构与BN纳米点的几何形状、尺寸以及纳米点浓度密切相关。由于电子-空穴对的对称性,使得费米能级附近的价带和导带几乎关于费米能级是对称的。对于含有三角形BN纳米点的石墨烯纳米带,当B和N交换时,价带和导带正好关于费米能级相互倒置。而且,由于C原子和多余B原子(或多余N原子)之间的轨道杂化,使得在费米能级附近形成一条局域的能带。另外,当电子在含有BN纳米点的石墨烯纳米带中输运时,在电导谱中会出现一系列的共振峰,其依赖于BN纳米点之间的距离和纳米点的形状。由此通过控制这些参数可以调制系统的电子响应。
An Application Study of Rainfall Measurement with Combined Active-Passive Microwave Remote Sensing
微波主被动联合测雨的应用研究

Liu Jinli,Zhang Ling,<br>,张凌
大气科学 , 1993,
Abstract: Field observations of rainfall measurements with combined Radar- Radiometer System were made and compared with in- situ measurements. It is shown that the accuracy of rainfall measurements with the combined system is obviously better than with a single redar only . The main errors of the combined method are analyzed . It is also indicated that the background brightness temperature should be properly chosen, and the errors caused by the vertical imhomogeneity of Ze have to be corrected. These results will be valuable to the future operational application of rainfall measurements with combined active- passive MW remote sensing .
Overview of Image Textural Feature Extraction Methods
图像纹理特征提取方法综述

LIU li,KUANG Gangyao,<br> ,匡纲要
中国图象图形学报 , 2009,
Abstract: Texture is an important visual cue. It widely exists in images and is hard to describe. Texture classification and segmentation is a hot research field in image processing. Due to its importance in texture classification and segmentation, texture feature extraction has received considerable attention during the past decades and numerous approaches have been presented in the literature. Based on extensive investigation of existing articles, the development history and current challenges of texture feature extraction methods are reviewed in details. First, a comprehensive overview of texture feature extraction methods is presented in this paper. Then, classification and comparisons of texture feature extraction methods are given. At last, conclusions and future development of texture feature extraction are discussed.
Medical Image Registration Based on Wavelet Transformation and Mutual Information
基于小波变换和互信息的医学图像配准

LIU Li,SU Min,<br>,苏敏
中国图象图形学报 , 2008,
Abstract: To improve the performance of medical image registration technology,a new method based on wavelet transformation and mutual information is proposed in this paper.Decomposed wavelet sub-bands of the original images are obtained using the wavelet transform.Coarse-to-fine multi-resolution search approaches have been performed.Registration at higher levels can be performed with the result at the pervious level serving as the initial condition.Down simplex method with limited boundary is used as optimization strategy.Besides,different methods are used at different levels.Regional mutual information(RMI) which takes geometry into account is used as similarity measure at low levels and PV interpolation is applied at high level in order to prevent the optimizing process from being tapped into local maximums.The algorithm has been applied on noisy MR mono-modality,PET mono-modality and MR-PET multimodality medical image registration.The results show that the algorithm performs fairly well.Compared with the traditional algorithms,the algorithm has some advantages such as higher precision and better anti-noisy performance as well as higher computation efficiency.
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