Results 21 to 30 of about 1,837,122 (168)

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, Juntian Wei, Yangyu Jia, Huaning Jiang, Kunpeng Si, Jiantao Du, Kaiyu Xu, Jiacheng Li, Chenyang Zhu, Jijun Yang, Shengxue Yang, Qianqian He, Peng Zhang, Yongji Gong   +13 more
wiley   +1 more source

Defect Engineering via Ultrasonic Vibration for Activating High‐Valent Nickel Sites Toward Enhanced Seawater Urea Oxidation Reaction

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, Yutao Tan, Shengyu Zhao, Luoyu Hu, Zhenxuan Zhang, Wenqing Ruan, Xiaodi Liu, Jie Dong, Cunhong Yin, Dabin Zhang, Chaoqun Pei, Jiang Ma   +11 more
wiley   +1 more source

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019
目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua, Wenchong Du, Xiaotian Dai, Meiqin Wu, Xianying Cai, Min Shen, Liping Zhu   +6 more
wiley   +1 more source

Anisotropic MoS2/SiC Aerogels: A Multifunctional Platform for Broadband Electromagnetic Stealth and Thermal Management

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, Longhui He, Fanqi Meng, Hui Zhang, Lixi Wang   +4 more
wiley   +1 more source

Ultralight N‐Doped Interconnected Porous Carbon From Lignin: Synergistic Structural and Doping Engineering for High‐Performance Electromagnetic Wave Absorption

Rare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The development of lightweight, high‐attenuation, and broadband carbon‐based electromagnetic wave absorbers is hindered by the intrinsic trade‐off between impedance matching and dielectric dissipation. Herein, we report a facile and scalable synthesis of N‐doped lignin‐derived interconnected porous carbon (Nx‐LIPC) via hydrogen‐bond self ...
Bin‐Peng Zhang, Jin Li, Le Qiao, Ping‐Xian Feng, Zhi‐Yi Huang, Qing‐Ao Peng, Chen‐Xi Liu, Huan Wang   +7 more
wiley   +1 more source

Bifunctional Competitive Structure of Biomass Carbon‐Derived Metacomposites for Tunable ε′‐Near‐Zero and ε′‐Negative Responses

Rare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang, Yunpeng Qu, Qixuan Zeng, Xiaosi Qi, Yao Liu   +4 more
wiley   +1 more source

高频等离子法制取超细Si_3N_4粉末

, 1990
本文述及高频等离子法制取超细Si_3N_4粉末的原理、装置,工艺参数及粉末性能的一些检测结果。利用SiCl_4+NH_3气-气相反应,所得白色粉末含有NH_4Cl晶体,热重分析表明350℃失重停止,280℃失重速率最快,经400～700℃处理后的粉末仍为非晶,不含NH_4Cl,BET测得比表面积为75.8 m~2/g,X光小角度散射法测粒子半径分布主峰R为100～150,且符合正态对数分布规律,平均直径=527;1400℃处理后,X光衍射测得主相为α-Si_3N_4、次相为Si_2N_2O,粒径明显长大,
朱清文, 赵俊平, 张智伯, 谭益钦, 邵国强, 庄祎哲, 阎家坪   +6 more
core   +2 more sources

GIS局部放电检测方法的分析研究

Gaoya dianqi, 2012
为了研究脉冲电流法、超声波法和超高频法检测GIS设备内部局部放电的优缺点,利用220 kV GIS试验段建立了一套GIS局部放电检测平台。应用脉冲电流法、超声波法以及超高频法对高压导体尖端、地电极尖端和悬浮尖端典型缺陷进行了测试,获取大量的实验数据和图谱。试验结果表明:脉冲电流法对缺陷普遍具有较高的灵敏度,但抗干扰能力较差,对于现场应用有一定局限性;超声波法对于局部放电信号灵敏度较低,但是抗电磁干扰性强;超高频法抗干扰能力强且灵敏度高,适合用于现场检测。总体来看,多种检测方法需要配合来综合确认。
王卫东, 赵现平, 王达达, 王科, 谭向宇, 彭晶   +5 more
doaj  

Undetected cases after implementation of first‐trimester anomaly scan in low‐risk population: insights from the IMITAS study

Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 1, Page 27-33, January 2026.
ABSTRACT Objective To assess the effectiveness of the first‐trimester anomaly scan (FTAS) performed as part of a centrally steered national screening program in The Netherlands by investigating false‐negative cases with a fetal structural anomaly that was not detected at the FTAS.
K. Bronsgeest, E. E. R. Lust, S. C. E. Zaaijer, L. Henneman, N. Crombag, C. M. Bilardo, R.‐J. H. Galjaard, E. Sikkel, A. K. K. Teunissen, M. N. Bekker, M. C. Haak, Collaborators, A. B. C. Coumans, A. Elvan‐Taşpınar, S. Galjaard, A. T. J. I. Go, E. van Leeuwen, G. T. R. Manten, E. Pajkrt   +18 more
wiley   +1 more source

Performance improvements in complementary metal oxide semiconductor devices and circuits based on fin field‐effect transistors using 3‐nm ferroelectric Hf0.5Zr0.5O2

Rare Metals, Volume 43, Issue 7, Page 3242-3249, July 2024.
Graphical abstract AbstractIn this work, a conventional HfO2 gate dielectric layer is replaced with a 3‐nm ferroelectric (Fe) HZO layer in the gate stacks of advanced fin field‐effect transistors (FinFETs). Fe‐induced characteristics, e.g., negative drain induced barrier lowering (N‐DIBL) and negative differential resistance (NDR), are clearly observed
Zhao‐Hao Zhang, Yan‐Na Luo, Gao‐Bo Xu, Jia‐Xin Yao, Zhen‐Hua Wu, Hong‐Bin Zhao, Qing‐Zhu Zhang, Hua‐Xiang Yin, Jun Luo, Wen‐Wu Wang, Hai‐Ling Tu   +10 more
wiley   +1 more source