Results 31 to 40 of about 15,595 (167)
Study the performance EVAluation systerm ofChina Telecom Corporation Limited [PDF]
, 2008 随着经济全球化和全球信息化的推进，社会对信息的依赖越来越大，信息的创造、加工、处理和传递成为经济增长的重要源泉，作为信息主要传递载体的电信业的战略地位也愈发重要。电信业作为国民经济的基础性产业和战略性产业，如何促进行业健康快速发展对国民经济而言具有十分重要的意义。我国的电信业在经过数次整合与重组后，形成了目前中国移动、中国电信、中国联通、中国网通、中国卫通、中国铁通等6家主要电信公司共存的格局。然而随着市场需求的变化和电信技术的革新，以中国电信为代表的传统固网运营商竞争优势日趋衰减 ...
宋磊
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Hybrid Multi-Scale Medical Image Fusion Based on Structural Similarity Optimization [PDF]
Existing multi-modal medical image fusion methods suffer from incomplete preservation of structural information and phase features. Therefore, this study proposes a medical image fusion method based on hybrid multi-scale decomposition and local structure
Yunhang LI, Qing PAN, Nili TIAN
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World Water Policy, Volume 12, Issue 1, February 2026.ABSTRACT This paper examines the rise and collapse of the 2021 United Arab Emirates (UAE)–Israel–Jordan Water‐for‐Energy Deal, a landmark initiative that sought to exchange Jordanian solar energy for Israeli desalinated water. Presented as a breakthrough in regional cooperation and environmental peacebuilding, the agreement was brokered under the ...
Majed Abu‐Zreig, Hussam Hussein
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2008 在鼓泡碳化法制备的普通及纳米碳酸钙表面包覆上一层羟基氧化铝，根据差热热重分析实验数据，采用master-plot标准作图法和经典动力学机理方程确定了碳酸钙的分解机理并求取相应动力学参数.普通碳酸钙包覆后分解机理由R2变为D1，纳米碳酸钙包覆后分解机理由R3变为R2.用微分和积分方法验证活化能得到很好的一一对应结果.对包覆二元复合物特殊的热分解动力学行为做了初步解释.
ZHANGHui-zhu(张惠珠) +2 more
doaj +1 more source
Evolution of research on global amphibian declines
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract In the late 1980s, the scientific community became aware of severe, enigmatic amphibian population declines. These declines triggered a wave of research focused on quantifying their extent and identifying key drivers. We used text‐analysis techniques, including topic modeling and geoparsing, to examine the evolution of research focused on ...
Jordann Crawford‐Ash +6 more
wiley +1 more source
, 2003 介绍了典型的时频分析方法及所研发的虚拟式多功能时频分析系统。该仪器系统功能十分强大,主要包括:零相位数字滤波、短时付氏变换、多分辨时频分析、魏格纳分布、乔伊威廉斯分布、小波和小波包阈值滤波、二进小波及小波包正交分解、连续小波变换等。文中逐一介绍各主要功能的基本原理。给出了仪器的开发、设计、仿真及其应用实例。值得一提的是,在分析极大极小尺度共存信号时,作者所提出的多分辨时频分析方法比其它经典时频分析方法有明显的优势。国家863子项目(2002AA842180-1);; 集美大学科研启动基金 ...
纪跃波, 郭隐彪
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Transition metal carbides demonstrate exceptional mechanical properties but confront a critical hardness–toughness trade‐off. Spinodal decomposition‐mediated phase separation is an effective approach to enhance mechanical properties in carbide ceramics through high‐temperature treatment.
Zhi‐Xuan Zhang +6 more
wiley +1 more source
Guangtongxin yanjiu, 2012 新型相位调制格式技术能够有效地减少光传输损伤,是光传输系统中的重要技术。从理论上分析了光MDPSK（M进制差分相移键控）的调制解调原理,构建了通用的调制解调结构,并首次推导出MDPSK的通式和解调公式,最后以基于CSRZ（载波抑制归零,占空比为67%）码的DQPSK（差分正交相移键控）、8DPSK（3阶差分相移键控）和16DPSK（4阶差分相移键控）为例,用MATLAB软件仿真得到了其调制后的频谱图和解调后的眼图。仿真结果表明,随着级数的增加,MDPSK调制格式的频谱宽度会逐渐变窄 ...
房文敬 +4 more
doaj
Image fusion method based on JBF and multi-order local region energy
Xibei Gongye Daxue Xuebao, 2022 针对多模态医学图像融合方法融合质量差、计算效率低等问题。提出了一种基于联合双边滤波(JBF)与多阶局部区域能量(MLNE)的图像融合方法。该方法将输入图像分解成能量层和结构层, 对于能量层与结构层的融合分别提出了基于MLNE和局部区域L2范数取大值的融合方案, 融合能量层和结构层相加获得融合图像。1组不同模态的医学图像融合实验结果证明, 文中提出的方法在融合性能、计算效率、视觉评价等方面都优于其他的对比方法。
WANG Feng, CHENG Yongmei
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT High‐entropy alloys (HEAs) have emerged as a transformative class of materials distinguished by their complex chemical compositions, unique microstructures, and remarkable mechanical and functional properties. Traditionally, the discovery and optimization of HEAs have relied on conventional methods, including trial‐and‐error experimentation ...
Chrispin Ouko Zamzu +2 more
wiley +1 more source