Results 1 to 10 of about 59,193 (237)

Structural analysis of traditional Chinese blocked-keyhole padlocks [PDF]

Mechanical Sciences, 2022
The use of locks has a history of thousands of years. Barbed-spring padlocks are the typical locks used in ancient China and can be divided into three main types, namely open-keyhole, hidden-keyhole, and blocked-keyhole padlocks.
Y. Zhang, H.-T. Wang, J.-L. Lin, C.-F. Huang, K.-H. Hsiao   +4 more
doaj   +1 more source

Promoter keyholes enable specific and persistent multi-gene expression programs in primary T cells without genome modification [PDF]

, 2020
Non-invasive epigenome editing is a promising strategy for engineering gene expression programs, yet potency, specificity, and persistence remain challenging.
Acosta, Reyes, Baker, David, Bates, Daniel, Bloom, Jordan, Boyken, Scott E., Chen, Zibo, Ciarlo, Christie, Dunn, Douglass, Federation, Alexander, Funnell, Alister, Green, Shon, Heberlein, Gregory, Liao, Hanna, Nandakumar, Vivek, Otterman, Ericka, Pearl, Jocelynn, Queitsch, Konstantin, Sandstrom, Richard, Schanzer, Elaine, Stamatoyannopoulos, John A., Urnov, Fyodor D., Van Biber, Benjamin, Vong, Shinny, Wang, Hao, Wilken, Matthew S., Zrazhevskey, Pavel   +25 more
core  

Keyhole Formation by Laser Drilling in Laser Powder Bed Fusion of Ti6Al4V Biomedical Alloy: Mesoscopic Computational Fluid Dynamics Simulation versus Mathematical Modelling Using Empirical Validation

Nanomaterials, 2021
In the laser powder bed fusion (LPBF) process, the operating conditions are essential in determining laser-induced keyhole regimes based on the thermal distribution.
Asif Ur Rehman, Muhammad Arif Mahmood, Fatih Pitir, Metin Uymaz Salamci, Andrei C. Popescu, Ion N. Mihailescu   +5 more
doaj   +1 more source

Finite element simulation of magnesium alloys laser beam welding [PDF]

, 2010
The authors are grateful to FONDERIE MESSIER (HONSEL group) that provided the as-cast magnesium alloy workpieces. The authors would like also to acknowledge the technical support of Dr.
BARRALLIER, Laurent, BELHADJ, Asma, BESSROUR, Jamel, BOUHAFS, Mahmoud, MASSE, Jean-Eric   +4 more
core   +5 more sources

Optimising the laser-welded butt-joints of medium carbon steel using RSM [PDF]

, 2005
The optimization capabilities in design-expert software were used to optimise the keyhole parameters (i.e. maximize penetration (P) and minimise the heat input, width of welded zone, (W) and width of heat affected zone (WHAZ)) in CW CO2 laser butt ...
Benyounis, Khaled, Hashmi, Saleem, Olabi, Abdul-Ghani   +2 more
core   +1 more source

Numerical Simulation of Molten Pool Dynamics in Laser Deep Penetration Welding of Aluminum Alloys

Crystals, 2022
In this paper, the numerical simulation of molten pool dynamics in laser deep penetration welding of aluminum alloys was established based on the FLUENT 19.0 software.
Jin Peng, Hongqiao Xu, Xiaohong Yang, Xingxing Wang, Shuai Li, Weimin Long, Jian Zhang   +6 more
doaj   +1 more source

Photodissociation regions and star formation in the Carina Nebula [PDF]

, 2001
We have obtained wide-field thermal infrared (IR) images of the Carina Nebula, using the SPIREX/Abu telescope at the South Pole. Emission from poly-cyclic aromatic hydrocarbons (PAHs) at 3.29um, a tracer of photodissociation regions (PDRs), reveals many ...
Allamandola, Allamandola, Arendt, Brooks, Brooks, Brooks, Burton, Castets, Chan, Cohen, Cohen, Cohen, Cohen, Cox, Cox, de Graauw, Egan, Fowler, Gardner, Geballe, Genzel, Gooch, Grabelsky, Hasegawa, Hereld, Hollenbach, J. M. Rathborne, J. W. V. Storey, Joblin, Jones, K. J. Brooks, Lada, Léger, M. C. B. Ashley, M. Cohen, M. G. Burton, McGregor, Megeath, Meixner, Mill, Moutou, Panagia, Price, Price, Retallack, Sakamoto, Schneider, Scoville, Sellgren, Smith, Stutzki, Tauber, Tovmassian, Ulich, Verstraete, Wainscoat, Walborn, Walsh, Whiteoak, Whiteoak   +59 more
core   +2 more sources

Possible explanations for different surface quality in laser cutting with 1 micron and 10 microns beams [PDF]

, 2012
In laser　cutting　of　thick　steel　sheets,　quality　difference　is　observed　between　cut　surfaces　obtained　with 1 micron and 10 micron laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength ...
Golubev V. S., Grigory E., Hilton P. A., Himmer T., Koji Hirano, Petring D., Remy Fabbro, Scintilla L. D., Scintilla L. D., Vossen G., Wandera C.   +10 more
core   +6 more sources

Online Detection of Keyhole Status in a Laser-MIG Hybrid Welding Process

Metals, 2022
During laser-metal inert gas (MIG) hybrid welding, a large amount of welding status information is generated in droplet transfer, keyhole and molten pool.
Xi’an Fan, Xiangdong Gao, Yuhui Huang, Yanxi Zhang   +3 more
doaj   +1 more source

From Multi-Keyholes to Measure of Correlation and Power Imbalance in MIMO Channels: Outage Capacity Analysis

, 2011
An information-theoretic analysis of a multi-keyhole channel, which includes a number of statistically independent keyholes with possibly different correlation matrices, is given.
Levin, George, Loyka, Sergey
core   +2 more sources