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《低温物理学报》创刊于 1 979年 ,至今已出版 2 3卷 1 2 2期 ,发表论文 2 0 0 0余篇 .本刊是首批进入国家类核心期刊之一 ,是《中国学术期刊文摘》 ,《中国科学院引文数据库》 ,《中国科学文摘》等检索性刊物的源刊之一 .从 80年代起 ,被世界六大检索系统《SA》 ,《PЖ》收录 ,是宣传和报道低温物理学领域研究成果的唯一专业性学术期刊 ,是中国物理学会低温物理专业委员会会刊 .她起到了活跃学术思想 ,繁荣科学园地 ,交流学术成果 ,促进学术争鸣 ,对推动低温物理学学科发展和建设起到了积极作用 .多次获中科院出版基金资助和国家超导重… 相似文献
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与时俱进努力创建国际一流学术期刊--纪念《物理学报》创刊70周年 总被引:3,自引:0,他引:3
《物理学报》是由中国物理学会主办的刊物 .她创刊于 1933年 ,原名“ChineseJournalofPhysics” ,195 3年易为现名 .她是中国第一份物理类综合性的学术期刊 ,由我国第一代著名物理学家严济慈和丁燮林任首任编委会负责人 (当时称干事 ) .随后相继担任编委会负责人的有 :吴大猷、赵忠尧、钱临照、王竹溪、顾功叙、黄祖洽和王乃彦 .70年来 ,《物理学报》从初创到成长、壮大 ,特别是改革开放以来的新发展 ,其中既有沧桑和凝重的感受 ,但更多的则是充满生机勃勃的改革与创新的时代气息 .现在 ,《物理学报》已成为目前我国在国内外影响面最广的… 相似文献
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<正>《物理学报》原名《中国物理学报》,创刊于1933年,至今已走过了90年艰难而光辉的历程.它是我国最早创刊的几种科技期刊之一,到现在,《物理学报》(以下简称“学报”)已成为我国物理学界最具有权威性的综合性中文学术期刊之一,发表文章的内容涵盖物理学各个学科及其交叉学科. 90年来,历届学报主编、副主编、编委和编辑部人员认真地执行办刊方针, 相似文献
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Signal structure of the Chinese Area Positioning System 总被引:8,自引:8,他引:0
Proper signal structure is very important in the navigation, positioning, and time services of a satellite navigation system.
In this paper, the carrier wave characteristics, ranging code functions, BOC modulation, navigation data rate, the error-correcting
methods, and signal channel resource allocation are discussed in terms of the technical characteristics of the transforming
satellite navigation system and the resources of communication satellites. The results show that dual-frequency of C band
in the Chinese Area Positioning System (CAPS), compound ranging code, a combination of the coarse code and precise code, BOC
modulation, separate-channel transmission of different users are compatible with the satellite navigation system at present.
The experiments show that the current signal structure can meet the demand of CAPS.
Supported by the Major Knowledge Innovation Programs of the Chinese Academy of Sciences (Grant No. KGCX1-21), the National
High Technology Research and Development Program of China (Grant No. 2004AA105030), the National Natural Science Foundation
of China (Grant No. 10453001), and the Major State Basic Research Development Program of China (Grant No. 2007CB815502) 相似文献
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In order to improve the naturalness of TTS speech so as to represent the cadence of natural speech, it is necessary to have a study on the pitch of spontaneous speech. Based on the 973 telephone corpus, the pitch ranges and pitch registers of 1084 intonation phrases are analyzed. It is found that intonation phrases can be classified according to their ranges and registers, and this is related to their positions in dialogue exchange. Compared with read speech, the pitch patterns in dialogue are more variable. 相似文献
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In many practical important cases, a massive dataset can be represented as a very large network with certain attributes associated with its vertices and edges. Stock markets generate huge amounts of data, which can be use for constructing the network reflecting the market’s behavior. In this paper, we use a threshold method to construct China’s stock correlation network and then study the network’s structural properties and topological stability. We conduct a statistical analysis of this network and show that it follows a power-law model. We also detect components, cliques and independent sets in this network. These analyses allows one to apply a new data mining technique of classifying financial instruments based on stock price data, which provides a deeper insight into the internal structure of the stock market. Moreover, we test the topological stability of this network and find that it displays a topological robustness against random vertex failures, but it is also fragile to intentional attacks. Such a network stability property would be also useful for portfolio investment and risk management. 相似文献
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The modified R/S statistic (MRS) and the local Whittle method (LWM) are used to analyze the long-range dependence on various indices of the
Chinese stock markets. The MRS accepts the null hypothesis of no long-range dependence while the LWM rejects it. We also find
that the long-range dependence phenomena presented in these markets depend on the time in which they are measured.
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By using the tools of statistical physics and recent investigations of the scaling properties of different complex networks,
the structural and evolving properties of the Chinese railway network (CRN) is studied. It has been verified that the CRN
has the same small-world properties of the Indian railway network (IRN). According to the class of small-world networks, we
believe the CRN is a single scale. In addition, a novel result is obtained. Measurements on the CRN indicate that the rate
at which nodes acquire links depends on the node’s degree and follows a power law.
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The modified R/S statistic (MRS) and the local Whittle method (LWM) are used to analyze the long-range dependence on various indices of the Chinese stock markets. The MRS accepts the null hypothesis of no long-range dependence while the LWM rejects it. We also find that the long-range dependence phenomena presented in these markets depend on the time in which they are measured. 相似文献
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杉木光变色的FTIR光谱分析 总被引:1,自引:1,他引:0
暴露于室外环境的木材或木制品,由于受气候因子的作用其表面性状和品质发生劣化,主要表现为木材变色,大大降低其利用价值。以人工林杉木为研究对象,利用模拟太阳辐射的氙光衰减仪对木材表面进行光劣化处理,采用傅里叶变换红外(FTIR)光谱技术分析了木材光变色过程中化学成分的变化,建立了木材变色与化学成分变化之间的关系。试验结果表明:光照过程中,1 512,1 462,1 269和1 227 cm-1处与木质素有关的吸收峰强度明显降低,1 720~1 735 cm-1处非共轭羰基伸缩振动吸收明显增强,木材表面发生光氧化反应,木质素明显降解,同时不断有新的羰基化合物生成;光照80 h内,木质素的降解以及羰基化合物的生成速度较快,此后变化不显著;木材表面部分多糖物质(纤维素和半纤维素)被氧化降解。研究表明,木材光照过程中的颜色变化(ΔE*)与木质素的降解以及羰基官能团的生成密切相关。 相似文献