Results 41 to 50 of about 19,592,386 (260)

Design guidelines for nanoscale vacuum field emission transistors

, 2016
Nanoscale vacuum channel field emission transistors (VFETs) with different gate-structures, channel lengths, and emitter tip radii are comprehensively studied using technical computer-aided design simulation. With a multigate configuration, the operating
Kim, J, Oh, H, Meyyappan, M, Han, JW, Lee, JS, Jin-Woo Han, Jiwon Kim, Hyeongwan Oh, Jeong-Soo Lee, Jungsik Kim, M. Meyyappan   +10 more
core   +1 more source

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source

The clinical efficacy of novel semirigid ureteroscopy with a vacuum suction device for treatment of >10 mm upper ureteral stones and impacted calculus: implications for clinical practice

Frontiers in Surgery
ObjectiveThe novel semirigid ureteroscopy with a vacuum suction device has been increasing in the treatment of urinary stones recently. This study aimed to evaluate its clinical efficacy for treating >10 mm upper ureteral stones and impacted calculus ...
Longhui Lai, Longhui Lai, Yuanfeng Zhang, Yuanfeng Zhang, Yingru Wang, Enguang Yang, Guangrui Fan, Chaohu Chen, Kang Yao, Wenzhao Zhang, Wenzhao Zhang, Yongfei Liu, Yongfei Liu, Kai Zhu, Kai Zhu, Meixuan Ding, Meixuan Ding, Jinchun Xing, Zhiping Wang, Peide Bai, Tao Wang, Bin Chen, Jun Mi   +22 more
doaj   +1 more source

Modelling the PbLi flow including tritium transport and permeation with GETTHEM

Nuclear Materials and Energy, 2023
One of the main challenges to be addressed to achieve a reliable electricity production from the EU DEMO reactor is the realization of a closed fuel cycle, for which a suitable Tritium Extraction and Removal System (TERS) is required. One of the possible
Roberto Bonifetto, Nicolò Abrate, Antonio Froio, Fabrizio Lisanti, Francesca Papa, Marco Utili, Alessandro Venturini   +6 more
doaj   +1 more source

The concept of vacuum in quantum electrodynamics [PDF]

, 2010
A re-evaluation of the concept of vacuum in quantum electrodynamics is presented, focusing on the vacuum of the quantized electromagnetic field. In contrast to the ‘nothingness’ associated to the idea of classical vacuum, subtle aspects are found in ...
bacelar valente, mario
core  

Investigation of vacuum polarization in t-channel radiative Bhabha scattering [PDF]

, 2001
We discuss the possibility of a precision measurement of vacuum polarization in t-channel radiative Bhabha scattering at a high luminosity collider. For illustration, the achievable precision is estimated for the BaBar experiment at PEP-II and for the ...
Karlen, D., Burkhardt, H.
core   +1 more source

A Simplified Laminar Flow Model for the Pultrusion of Glass Fiber/Polyethylene Terephthalate Commingled Yarns

Advanced Engineering Materials, EarlyView.
A simplified thermoplastic pultrusion model is developed to predict thermal fields in glass fiber/polyethylene terephthalate (GF/PET) composites with reduced computational cost. By combining effective material homogenization, validation against literature data, and Gaussian‐process‐based optimization, the study reveals how heating limits, pulling speed,
Elder Soares, Nadège Bouchonneau, Christian Jochum, Donald Radford   +3 more
wiley   +1 more source

Flexural Behavior of 3D‐Printed Porous Bouligand‐Structured Polymers: Influence of Pitch Angle and Porosity

Advanced Engineering Materials, EarlyView.
This study examines how helicoidal architectures with different porosities respond to bending. Adjusting layer angle and spacing in 3D‐printed polymers reveals clear tradeoffs between stiffness, strength, and energy absorption. Experiments and simulations highlight designs that distribute stress effectively, offering pathways for optimizing lightweight
Praveenkumar Subhash Patil, Edward D. McCarthy, Parvez Alam   +2 more
wiley   +1 more source

Hybrid active-passive thermal management system for deep wells: Long-term stability and multi-objective optimization

Results in Engineering
Continuous monitoring of deep Earth parameters is hindered by the thermal instability of electronic devices in high-temperature wells. To address this challenge, this study proposes a hybrid active-passive thermal management system integrating vacuum ...
Zongwei Yao, Haomin Li, Hongxu Xu, Hongfei Yang, Qiushi Bi, Tianshuang Xu   +5 more
doaj   +1 more source

Thermal shock behaviors and mechanisms of ytterbium silicate environmental barrier coatings modified by MoSi2

Journal of Aeronautical Materials, 2023
Rare-earth silicate environmental barrier coatings（EBCs）are important materials for the application in hot end components of new generation high thrust-to-weight ratio aero engines. However, the rare-earth silicate top layer is prone to form longitudinal
LIANG Ruihui, ZHONG Xin, HONG Du, HUANG Liping, WU Yiming, ZHAO Fangxia, NIU Yaran, ZHANG Zhenzhong, ZHENG Xuebin   +8 more
doaj   +1 more source