Results 41 to 50 of about 59,193 (237)
Blind Estimation of Effective Downlink Channel Gains in Massive MIMO
, 2015 We consider the massive MIMO downlink with time-division duplex (TDD) operation and conjugate beamforming transmission. To reliably decode the desired signals, the users need to know the effective channel gain.
Larsson, Erik G., Ngo, Hien Quoc
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On the Mechanism of the Step Coverage of Blanket Tungsten Chemical Vapor Deposition [PDF]
, 1993 In this study, computer modeling of the contact fill process with chemical vapor deposition, (CVD) of tungsten is usedto show the importance of several details on the quality of the fill process. The effect of surface curvature on the stepcoverage of CVD-
Hasper, A., Schmitz, J.E.J.
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Advanced Engineering Materials, EarlyView.This study demonstrates how optimizing laser power, scanning speed, and hatching distance in laser powder bed fusion can boost the productivity of Inconel 718 manufacturing by up to 29% while maintaining mechanical integrity. The work delivers a validated process window and cost–time analysis, offering industry‐ready guidelines for efficient additive ...
Amir Behjat +7 more
wiley +1 more source
Depth Dependence and Keyhole Stability at Threshold, for Different Laser Welding Regimes
Applied Sciences, 2020 Depending of the laser operating parameters, several characteristic regimes of laser welding can be observed. At low welding speeds, the aspect ratio of the keyhole can be rather large with a rather vertical cylindrical shape, whereas at high welding ...
Remy Fabbro
doaj +1 more source
Crystals, 2022 The effects of droplets filling the molten pools during the double-sided laser beam welding (DSLBW) of T-joints was established. The dynamic behavior of the keyhole and the molten pool under different droplet filling modes were analyzed.
Jin Peng +7 more
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Advanced Materials, EarlyView.Triply‐twinned architected lattices transform deformation from bending to stretching of struts, delivering up to threefold increases in stiffness and strength across polymeric and metallic systems. High‐resolution synchrotron XCT and image‐based simulations reveal how meta‐grain architecture, defects, and AM build orientation govern failure pathways ...
David McArthur +7 more
wiley +1 more source
Dizhen xuebao基于震前、震后多期卫星数据，对2001年11月4日昆仑山口西MS8.1同震地表破裂进行了研究，结果表明：① 同震破裂带的西段在震前未发现先存破裂遗迹，而东段是在先存地震破裂遗迹上再次发生了破裂。② 震后两年，湖面冰、大型河道、冲沟和冲洪积扇上的地表破裂迅速地被活动性流水和气温变化等破坏，在影像上已无踪迹；震后二十年，低级阶地的地表破裂几乎无法识别，而高级阶地的破裂带保留较完整，可识别长度锐减至64%，呈“碎片”化展布。因此，同震地表破裂带的影像识别主要受所处地貌位置和气候变化等地表作用过程的影响 ...
Jiayi Li +3 more
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Impact absorbing blade mounts for variable pitch blades [PDF]
, 1977 A variable pitch blade and blade mount are reported that are suitable for propellers, fans and the like and which have improved impact resistance. Composite fan blades and blade mounting arrangements permit the blades to pivot relative to a turbine hub ...
Adamson, A. P. +2 more
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A Scintillator Tile-Fiber Preshower Detector for the CDF Central Calorimeter
, 2004 The front face of the CDF central calorimeter is being equipped with a new Preshower detector, based on scintillator tiles read out by WLS fibers, in order to cope with the luminosity increase provided by the Main Injector during the Tevatron's Run II ...
Abe, Abe, Stefano Lami
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Advanced Materials Technologies, EarlyView.ABSTRACT Real‐time insight into local chemistry is critical for reliable part quality in additive manufacturing, especially laser powder bed fusion (PBF‑LB/M), where rapid thermal cycles and localized evaporation can undermine part performance. Optical emission spectroscopy (OES) offers non‑intrusive, in situ plume monitoring, but detection geometry ...
Philipp Gabriel +4 more
wiley +1 more source