Results 281 to 290 of about 2,251,211 (322)

Reconfigurable-Intelligent-Surface-Aided Number Modulation for Symbiotic Active/Passive Transmission

IEEE Internet of Things Journal, 2023
Reconfigurable intelligent surface (RIS)-aided symbiotic active/passive transmission is a promising communication paradigm, which is able to improve the propagation environment while transmitting additional information.
Qiang Li, Miaowen Wen, Lexi Xu, Kang Li
semanticscholar   +1 more source

Active Reconfigurable Intelligent Surface: Fully-Connected or Sub-Connected?

IEEE Communications Letters, 2022
To overcome the “multiplicative fading effect” introduced by passive reconfigurable intelligent surface (RIS), the concept of active RIS has been recently proposed to amplify the radiated signals.
Kunzan Liu, Zijian Zhang, L. Dai, Shenheng Xu, Fan Yang   +4 more
semanticscholar   +1 more source

Comparing the surface activities of compounds using an elemental adsorbate

Journal of Physics D: Applied Physics, 1997
It has been proposed that the interaction of a substrate with a suitable elemental adsorbate can be used to monitor its surface chemical activity. If the extent of adsorbate - substrate interaction can be measured by a surface chemical probe such as x-ray photoelectron spectroscopy, one could compare the surface activities of a variety of solids by ...
openaire   +2 more sources

Composite Yb:YAG/sapphire thin-disk active elements for high-energy high-average power lasers

, 2020
Composite active elements (AEs) of thin-disk geometry with an anti-amplified-spontaneous-emission (ASE) cap were created for the first time from dissimilar materials (Yb:YAG and sapphire crystals) using the surface-activated direct bonding method based ...
I. Kuznetsov, A. Pestov, I. Mukhin, M. Volkov, M. Zorina, N. Chkhalo, O. Palashov   +6 more
semanticscholar   +1 more source

The study of surface active element on weld pool development in A-TIG welding

Modelling and Simulation in Materials Science and Engineering, 2006
A 3D mathematical model was developed to simulate the weld pool development in a moving A-TIG weld pool with different oxygen and sulfur concentrations. It is shown that the surface active elements—oxygen and sulfur, which change the temperature coefficient of surface tension from a negative value to a positive one, can cause significant changes in ...
Yuzhen Zhao, Heping Zhou, Yaowu Shi
openaire   +1 more source

Efficient Active Elements Selection Algorithm for Hybrid RIS-Assisted D2D Communication System

IEEE Communications Letters
In this letter, we propose an efficient active elements selection (AES) algorithm for hybrid reconfigurable intelligent surface (RIS)-assisted device-to-device (D2D) communication system, where a subset of RIS elements is selected from the whole elements
Gaoze Mu, Peichang Zhang, Yanzhao Hou, Shida Zhong, Lei Huang, Tao Yuan   +5 more
semanticscholar   +1 more source

The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding

Metallurgical and Materials Transactions B, 2006
A three-dimensional mathematical model was developed to simulate the flow patterns and temperature distributions in a moving A-TIG weld pool of 304 stainless steels with different oxygen content using PHOENICS software. It is shown that the surface-active element, oxygen, is important, because it affects the weld shape by changing the flow patterns in ...
Yuzhen Zhao, Yaowu Shi, Yongping Lei
openaire   +1 more source

An alkali poisoning-resistant Fe2O3/MoO3/TiO2 catalyst for the selective reduction of NO by NH3: The role of MoO3 safety buffer in protecting surface active sites.

Environmental Science and Technology, 2019
The exhaust gas contains harmful products, including fuel-additive elements such as compounds of sodium, which cause dramatic catalyst deactivation of catalysts during selective catalytic reduction (SCR) of NO with NH3.
Jie Zhang, Zhiwei Huang, Yueyao Du, Xiaomin Wu, Huazhen Shen, Guohua Jing   +5 more
semanticscholar   +1 more source

Microstructure and properties of weld joint during 10 kW laser welding with surface-active element sulfur

Applied Surface Science, 2017
Abstract The present work has been focused on the effects of surface-active element sulfur on welding properties during 10 kW high power laser welding of 304 stainless steel thick plate. Molten pool behavior, morphology feature of sulfide inclusions, metallographic structures, XRD patterns, microhardness, potentiodynamic polarization curves and ...
Shichun Li, Zhaohui Deng, Hui Deng, Wei Xu   +3 more
openaire   +1 more source

Facile Protein Immobilization Using Engineered Surface-Active Biofilm Proteins

ACS Applied Nano Materials, 2018
Immobilization of enzymes and other biomolecules to surfaces is critically important for biotechnology, with important applications in sensing and controlled delivery of molecular species for analytical or biomedical purposes. The presentation of protein
Danielle M. Williams, Gilad Kaufman, H. Izadi, Abigail E. Gahm, Sarah M. Prophet, Kyle Vanderlick, C. Osuji, L. Regan   +7 more
semanticscholar   +1 more source