Zobrazeno 1 - 10
of 33
pro vyhledávání: '"A. F. Ptak"'
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
Scientific Reports
Scientific Reports
The influence of sliding speed in the nanoscale friction forces between a silicon tip and monolayer and multilayer graphene were investigated with the use of an atomic force microscope. We found that the friction forces increase linearly with the log
Publikováno v:
Diamond and Related Materials. 95:71-76
Graphene layers were synthesized on silica and 90, 300, 400 and 700 nm thick silicon dioxide films by chemical vapor deposition at semi-atmospheric pressure environment, using controlled mixtures of hydrogen, argon and methane gases. The effects of t
Publikováno v:
MRS Advances. 3:2743-2748
Despite being one of the oldest phenomena known to mankind and its vast use, there still are open questions about the frictional process between two surfaces, especially at the nanometer scale, such as the energy dissipation mechanism, the influence
Publikováno v:
MRS Advances. 3:2719-2724
Atomic force microscopy (AFM) and nanoindentation were used to characterize poly (methyl methacrylate) (PMMA) films with a wide distribution of pores. Pores with diameters ranging from tens of nanometers to few micrometers were measured by AFM and cr
Publikováno v:
Cellulose. 23:2653-2661
Friction affects the use of paper in many ways, from the manipulation and slippage control of paper sheets in large industrial machines to rolling and inking transfer in ballpoint pens. Paper is mainly constituted of cellulosic structures, whose cont
Autor:
D. Stern, Fiona A. Harrison, Dom Walton, A. C. Fabian, F. Fuerst, Didier Barret, Lian Tao, Matthew J. Middleton, Matteo Bachetti, A. F. Ptak, Jon M. Miller, V. Rana
Publikováno v:
NASA Astrophysics Data System
We present results from four new broadband X-ray observations of the extreme ultraluminous X-ray source Holmberg IX X-1 ($L_{\rm{X}} > 10^{40}$ erg/s), performed by $Suzaku$ and $NuSTAR$ in coordination. Combined with the archival data, we now have b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5112b30e008cba22ad86e4f08180072
https://resolver.caltech.edu/CaltechAUTHORS:20170421-141946967
https://resolver.caltech.edu/CaltechAUTHORS:20170421-141946967
Publikováno v:
Ultramicroscopy. 184
An optimized method of digital image processing to interpret quantum dots' height measurements obtained by atomic force microscopy is presented. The method was developed by combining well-known digital image processing techniques and particle recogni
Publikováno v:
The Astrophysical Journal. 885:62
X-ray data for quasar 4C 74.26 have previously been modeled with a broad Fe K$\alpha$ emission line and reflection continuum originating in the inner part of the accretion disk around the central supermassive black hole (SMBH), i.e. the strong gravit
Autor:
S. Bourke, R. Alexandroff, Z. Paragi, Timothy M. Heckman, David Schiminovich, Andrei Lobanov, A. F. Ptak, A. R. Basu-Zych, Roderik Overzier, G. Kauffmann
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 423:1325-1334
We have used the European VLBI Network (EVN) to observe a sample of Lyman Break Analogs (LBAs), nearby (z < 0.3) galaxies with properties similar to the more distant Lyman Break Galaxies (LBGs). The study of LBGs may help define the feed-back relatio
Autor:
J. P. Grimes, William V. Dixon, A. F. Ptak, Timothy M. Heckman, C. G. Hoopes, D. K. Strickland, K. R. Sembach, Alessandra Aloisi, Roderik Overzier
Publikováno v:
The Astrophysical Journal. 668:891-905
We have re-analyzed FUSE data and obtained new Chandra observations of Haro 11, a local (D_L=88 Mpc) UV luminous galaxy. Haro 11 has a similar far-UV luminosity (10^10.3 L_\odot), UV surface brightness (10^9.4 L_\odot kpc^-2), SFR, and metallicity to