Results 11 to 20 of about 1,145,122 (162)
Guangtongxin yanjiu, 2010 异步光码分多址（OCDMA）系统是近年来关注的热点,但对适用于该系统的二维码字的研究还比较少。文章分析了扩展同余码（EQC）在异步OCDMA系统中的相关性,并进一步提出一种用于异步OCDMA系统的二维时间/频率组合码的构造方法。分析该地址码的自相关和互相关特性的结果表明:由EQC和光正交码（OOC）构成的二维时间/频率组合码EQC/OOC具有良好的自相关和互相关特性。
李永萍, 张兴周
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Guangtongxin yanjiu, 2012 针对大气激光通信下的OFDM（正交频分复用）系统,对几种基于导频的信道估计方法进行了比较分析,并给出了仿真结果。仿真结果表明,SVD-LMMSE（基于奇异值分解的线性最小均方误差）算法在提高信道估计精度的同时,可以降低系统计算的复杂度;增大CP（循环前缀）可以非常有效地提高系统性能。
朱耀麟, 孟超, 柯熙政
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Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, Volume 40, Issue 4, August 2026.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
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Politics &Policy, Volume 54, Issue 4, August 2026.ABSTRACT After 2013, the number of statewide minimum wage increases in the United States surged. However, not every state followed the trend. Some refrained from minimum wage legislation completely. This article examines the causes of differences in state minimum wage policies from 2013 to 2022, taking a qualitative perspective on minimum wage politics
Emanuel Schuller
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Wafer‐Scale Amorphous g‐C3N4 With Broadly Tunable Dielectric Properties for 2D Electronics
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Two‐dimensional (2D) semiconductors are regarded as promising candidates for next‐generation electronics due to their superior electrostatic control; however, their performance is severely constrained by the lack of suitable dielectric materials.
Binyin Gao +13 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Developing high‐efficiency catalysts for the seawater urea oxidation reaction (UOR) is pivotal to advancing hydrogen production via seawater electrolysis. Defect engineering has established itself as a core strategy for regulating catalytic activity.
Xiaoyu Wu +11 more
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Asian Politics &Policy, Volume 18, Issue 3, July 2026.ABSTRACT Gray‐zone activities have become a central feature of security competition in East Asia, particularly in the Taiwan Strait, where persistent military operations blur the boundary between coercion and armed conflict. This study develops a structured threat‐assessment framework for evaluating the intensity of PLA aerial gray‐zone pressure around
Shih‐Yin Liang, Hsuan‐Lei Shao
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT To address the demand for high‐temperature stability, broadband strong absorption, and multifunctional integration of electromagnetic wave absorbing materials in complex service environments, lightweight molybdenum disulfide (MoS2) decorated silicon carbide (SiC) nanofiber composite aerogels with a directional layered interconnected structure ...
Zhi Song +4 more
wiley +1 more source
Functional Ecology, Volume 40, Issue 6, Page 1906-1920, June 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Human‐driven landscape change, particularly urbanization, is reshaping pollinator communities, yet the functional traits that mediate species persistence remain poorly understood. Dietary specialization is commonly used to predict species vulnerability.
Yan Yang +5 more
wiley +1 more source
, 2007 计量研究法的运用是当代词汇研究的一个趋势。计量方法有助于开拓新的研究领域,有助于重新考察、审视、印证现有的词汇理论与观点。研究词语通用度现在一般使用的是综合频率与散布系数的通用度计算法。本文提出了频级计算法,即根据词语在单个语料库,继而是多个语料库的频级来确定其排位顺序。频级统计法适用于多个语料库的配合使用,特别是对于立足于特性不一、容量差异明显的多个语料库之上的大规模词汇统计,是一种比较简单实用的计算方法。国家语委科研项目“现代汉语通用词语词量及分级”;; 国家社科规划课题“基于国家语委‘通用语料库 ...
苏新春
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