Results 71 to 80 of about 73,052 (295)

Asymmetry of the Ferroelectric Phase Transition in BaTiO3

Advanced Materials, EarlyView.
Phase transitions are typically assumed to behave identically in forward and reverse. This work shows that in the ferroelectric material barium titanate this is not true: heating drives an abrupt, first‐order jump, while cooling gives a smooth, continuous change.
Asaf Hershkovitz, Elangovan Hemaprabha, Rajesh Mandal, Pravin Kavle, Jamil Tanus, Maya Barzilay, Ching‐Che Lin, David Spirito, Semën Gorfman, Bo Wang, Ignacio J. Villar‐García, Neus Domingo, Long‐Qing Chen, Lane W. Martin, Yachin Ivry   +14 more
wiley   +1 more source

Improving the Angular Resolution of EGRET and New Limits on Supersymmetric Dark Matter Near the Galactic Center

, 2002
Using the EGRET data and an improved point source analysis, including an energy dependent point spread function and an unbinned maximum likelihood technique, we have been able to place considerably lower limits on the gamma ray flux from the galactic ...
Allanach, B. Dingus, Bergstrom, Bergstrom, Bergstrom, D. Hooper, Edsjo, Ellis, Goldberg, Gondolo, Gondolo, Hall, Moore, Navarro, Navarro, Pohl, Ullio, Weinberg   +17 more
core   +1 more source

DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor

The Astrophysical Journal, 2023
We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail.
Arjun Dey, Joan R. Najita, Sergey E. Koposov, J. Josephy-Zack, Gabriel Maxemin, Eric F. Bell, C. Poppett, E. Patel, L. Beraldo e Silva, A. Raichoor, D. Schlegel, D. Lang, A. Meisner, Adam D. Myers, J. Aguilar, S. Ahlen, C. Allende Prieto, D. Brooks, A. P. Cooper, K. S. Dawson, A. de la Macorra, P. Doel, A. Font-Ribera, Juan García-Bellido, S. Gontcho A Gontcho, J. Guy, K. Honscheid, R. Kehoe, T. Kisner, A. Kremin, M. Landriau, L. Le Guillou, Michael E. Levi, T. S. Li, Paul Martini, R. Miquel, J. Moustakas, Jundan Nie, N. Palanque-Delabrouille, F. Prada, E. F. Schlafly, Ray M. Sharples, Gregory Tarlé, Yuan-Sen Ting, L. Tyas, M. Valluri, Risa H. Wechsler, H. Zou   +47 more
doaj   +1 more source

Surface Reordering During Layer‐by‐Layer Growth on SrTiO3

Advanced Materials, EarlyView.
Surface structures (left) derived from DFT‐constrained fitting to crystal truncation rods measured by synchrotron X‐ray scattering (right) after each monolayer of deposition during the MBE growth of SrTiO3${\rm SrTiO}_{3}$ (001). The bottom panel shows the bare substrate, the middle panel shows island formation upon deposition of a single layer of SrO,
I‐Cheng Tung, Xi Yan, June‐Hyuk Lee, Yang Liu, Seo Hyoung Chang, Zhenlin Luo, Friederike Wrobel, Nicholas T. Cheung, Kaden R. Lopez, Michael J. Bedzyk, Hawoong Hong, John W. Freeland, Hua Zhou, Kendra Letchworth‐Weaver, Dillon D. Fong   +14 more
wiley   +1 more source

Self‐Powered Flexible Triboelectric‐Gated Ion‐Gel Transistor for Neuromorphic Tactile Sensing and Human Activity Recognition

Advanced Materials, EarlyView.
A fully flexible ion‐gel‐gated graphene‐channel transistor driven by a triboelectric nanogenerator enables self‐powered tactile sensing and synaptic learning. Mimicking spike‐rate‐dependent plasticity, the device exhibits frequency‐selective potentiation and depression, supporting rate‐coded neuromorphic computation even under flex.
Hanseong Cho, Seoyeon Park, Youngmin Lee, Sejoon Lee   +3 more
wiley   +1 more source

X-ray Halo Around the Spiral Galaxy NGC 4631 Observed with Suzaku

, 2008
Suzaku observation of the edge-on spiral galaxy NGC 4631 confirmed its X-ray halo extending out to about 10 kpc from the galactic disk. The XIS spectra yielded the temperature and metal abundance for the disk and the halo regions.
MITSUISHI, Ikuyuki, OHASHI, Takaya, SATO, Kosuke, YAMASAKI, Noriko Y., 三石, 郁之, 山崎, 典子   +5 more
core   +1 more source

Kinematics of the Outer Stellar Halo [PDF]

, 1996
We have tested whether the simple model for the kinematics of the Galactic stellar halo (in particular the outer halo) proposed by Sommer-Larsen, Flynn and Christensen (SLFC) is physically realizable, by directly integrating particles in a 3-D model of ...
Christensen, Per Rex, Flynn, Chris, Sommer-Larsen, Jesper   +2 more
core   +2 more sources

Looking for tidal streams around Galactic globular clusters

EPJ Web of Conferences, 2012
The picture of building the Milky Way halo from merging protogalactic fragments is considered the local manifestation of the hierarchical galaxy formation process.
Martínez-Delgado D., Carballo-Bello J.A.   +1 more
doaj   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

Galactic background surveys and the galactic halo [PDF]

Symposium - International Astronomical Union, 1959
Two surveys of the galactic background radiation at low frequencies have recently been made at Cambridge. At 38 Mc/s, a survey of the sky between declinations −20° and +70° has been made by Blythe [1] using a new type of pencil-beam aerial system. This instrument, consisting of an array 1200 feet long in an east-west direction together with a small ...
openaire   +1 more source