Results 41 to 50 of about 20,337 (305)

On the Lightweight Potential of Laser Additive Manufactured NiTi Triply Periodic Minimal Sheet Lattices

Advanced Engineering Materials, EarlyView.
This study explores the lightweight potential of laser additive‐manufactured NiTi triply periodic minimal surface sheet lattices. It systematically investigates the effects of relative density and unit cell size on surface quality, deformation recovery, compression behavior, and energy absorption.
Haoming Mo, Shuo Qu, Shiming Gao, Xu Song   +3 more
wiley   +1 more source

A Wide-Beam Scanning Mode for Near-Space Passive SARs

International Journal of Antennas and Propagation, 2012
A near-space passive SAR consists of a passive radar receiver placed on a near-space vehicle and another existing radar on a satellite serving as an illuminator.
Peng Zhou, Peng Ren, Yongshou Dai
doaj   +1 more source

Experimental Investigation of Compound Effect of Flexural and Torsion on Fiber-Reinforced Concrete Beams

Buildings, 2023
Fiber-reinforced concrete is widely acknowledged for its ability to resist cracking effectively and limit its propagation. By preventing cracks from spreading, the addition of fiber composites to concrete can enhance its extensibility and tensile ...
Nabeel H. Al-Salim, Muna H. Jaber, Rafea F. Hassan, Nisreen S. Mohammed, Husam H. Hussein   +4 more
doaj   +1 more source

Accelerating and abruptly-autofocusing beam waves in the Fresnel zone of antenna arrays [PDF]

, 2013
We introduce the concept of spatially accelerating (curved) beam waves in the Fresnel region of properly designed antenna arrays. These are transversely localized EM waves that propagate in free space in a diffraction-resisting manner, while at the same ...
Chremmos, Ioannis, Fikioris, George, Efremidis, Nikolaos K.   +2 more
core  

Effects of coherence and polarization on the beam spreading and direction through atmospheric turbulence

, 2011
Based on extended Huygens-Fresnel principle, analytical expressions of beam width and far-field angular spreading for electromagnetic Gaussian Schell-model (EGSM) beams propagating in atmospheric turbulence are obtained.
Wu, Guohua, Dang, Anhong, Yu, Song, Zhao, Tonggang, Guohua Wu, Guo, Hong, Bin Luo, Hong Guo, Luo, Bin, Anhong Dang, Song Yu, Tonggang Zhao   +11 more
core   +1 more source

High resolution measurements and modeling of auroral hydrogen emission line profiles [PDF]

, 2003
Measurements in the visible wavelength range at high spectral resolution (1.3 A° ) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation.
Frey, H.U., H. U. Frey, D. Lummerzheim, Galand, M., Lummerzheim, D., S. C. Robertson, Robertson, SC, Frey, HU, Peticolas, L.M., Lummerzheim, D, Furniss, I, Baumgardner, J, M. Mendillo, Lanchester, B.S., J. Baumgardner, Baumgardner, J., Rees, M.H., I. Furniss, Lanchester, BS, Robertson, S. C., Furniss, I., M. Galand, Peticolas, L. M., Mendillo, M., Galand, M, B. S. Lanchester, Rees, MH, M. H. Rees, Peticolas, LM, Rees, M. H., L. M. Peticolas, Robertson, S.C., Lanchester, B. S., Mendillo, M, Frey, H. U.   +34 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

Relativistic quantum mechanics of charged vortex particles accelerated in a uniform electric field

Physical Review Research
The relativistic quantum-mechanical description of a charged Laguerre-Gauss beam accelerated in a uniform electric field has been fulfilled. Stationary wave eigenfunctions are rigorously derived.
Qi Meng, Ziqiang Huang, Xuan Liu, Wei Ma, Zhen Yang, Liang Lu, Alexander J. Silenko, Pengming Zhang, Liping Zou   +8 more
doaj   +1 more source

High range free space optic transmission using new dual diffuser modulation technique

EPJ Web of Conferences, 2017
Free space optical communication fsoc is vulnerable with fluctuating atmospheric. This paper focus analyzes the finding of new technique dual diffuser modulation (ddm) to mitigate the atmospheric turbulence effect.
Rahman A.K, Julai N, Jusoh M, Rashidi C.B.M., Aljunid S.A, Anuar M.S, Talib M.F, Zamhari Nurdiani, Sahari S.k, Tamrin K.F., Jong Rudiyanto P., Zaidel D.N.A, Mohtadzar N.A.A, Sharip M.R.M, Samat Y.S   +14 more
doaj   +1 more source

Si1-x Gex structures fabricated by focused ion beam implantation

, 1998
In this work we present a study of the spreading resistance for Si1-xGex structures fabricated by F.I.B - L.M.I.S. technique. Maskless ion implantation using a Focused Ion Beam has the advantages of high resolution, the possibility to vary dose, energy ...
J. Teichert, D. Panknin, Mair, GLR, Panknin, D, Th. Ganetsos, Aidinis, C, C. Aidinis, Teichert, J, G.L.R. Mair, Tsamakis, D, D. Tsamakis, Bischoff, L, Ganetsos, Th, L. Bischoff   +13 more
core   +1 more source