Search results for "upe"
showing 10 items of 7447 documents
Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope
2020
All authors: Wielgus, Maciek; Akiyama, Kazunori; Blackburn, Lindy; Chan, Chi-kwan; Dexter, Jason; Doeleman, Sheperd S.; Fish, Vincent L.; Issaoun, Sara; Johnson, Michael D.; Krichbaum, Thomas P.; Lu, Ru-Sen; Pesce, Dominic W.; Wong, George N.; Bower, Geoffrey C.; Broderick, Avery E.; Chael, Andrew; Chatterjee, Koushik; Gammie, Charles F.; Georgiev, Boris; Hada, Kazuhiro Loinard, Laurent; Markoff, Sera; Marrone, Daniel P.; Plambeck, Richard; Weintroub, Jonathan; Dexter, Matthew; MacMahon, David H. E.; Wright, Melvyn; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barausse, Enrico; Barrett, John; Bintley, Dan; Boland, Wilf…
Detection of Intrinsic Source Structure at ~3 Schwarzschild Radii with Millimeter-VLBI Observations of SAGITTARIUS A*
2018
We report results from very long baseline interferometric (VLBI) observations of the supermassive black hole in the Galactic center, Sgr A*, at 1.3 mm (230 GHz). The observations were performed in 2013 March using six VLBI stations in Hawaii, California, Arizona, and Chile. Compared to earlier observations, the addition of the APEX telescope in Chile almost doubles the longest baseline length in the array, provides additional {\it uv} coverage in the N-S direction, and leads to a spatial resolution of $\sim$30 $\mu$as ($\sim$3 Schwarzschild radii) for Sgr A*. The source is detected even at the longest baselines with visibility amplitudes of $\sim$4-13% of the total flux density. We argue th…
Phoxonic Hybrid Superlattice
2015
We studied experimentally and theoretically the direction-dependent elastic and electromagnetic wave propagation in a supported film of hybrid PMMA (poly[methyl-methacrylate])-TiO2 superlattice (SL). In the direction normal to the layers, this one-dimensional periodic structure opens propagation band gaps for both hypersonic (GHz) phonons and near-UV photons. The high mismatch of elastic and optical impedance results in a large dual phoxonic band gap. The presence of defects inherent to the spin-coating fabrication technique is sensitively manifested in the band gap region. Utilizing Brillouin light scattering, phonon propagation along the layers was observed to be distinctly different from…
Magnetic excitations of a doped two-dimensional antiferromagnet
1993
Magnetic excitations of the two-dimensional (2D) t-J model are considered in the presence of a small concentration of holes c. The spin-wave approximation used implies long-range antiferromagnetic ordering from the beginning. Migdal's theorem is shown to be valid for the model considered. The energy spectrum of the magnons is determined with the help of the one-pole approximation for the hole Green's function. If the concentration of mobile holes is larger than a critical value an additional branch of overdamped magnons arises near the \ensuremath{\Gamma} and M points of the Brillouin zone. This is connected with the generation of electron-hole pairs (the Stoner excitations) by magnons. The…
Theoretical modeling of antiferrodistortive phase transition forSrTiO3ultrathin films
2013
Combining group-theoretical analysis and first-principles density functional theory calculations, we confirm theoretically the antiferrodistortive phase transition in ultrathin SrTiO${}_{3}$ (001) TiO${}_{2}$-terminated films and compare it with a similar transition in the bulk. We demonstrate phonon softening at the $M$ point of the surface Brillouin zone and analyze the change in the calculated electronic and phonon properties upon phase transition.
Façonner la terre. Traditions techniques des potiers dans la vallée du Rhin supérieur (Xe-VIIIe siècle av. J.-C.)
2023
How was pottery made during the Bronze Age? The technological ceramic study carried out on 16 habitation and 3 funerary sites of the upper Rhine Valley and its surroundings, which date from the 10th to the 8th centuries BC, reveals an incredible variety among chaînes opératoires. Macrotraces observed on 829 ceramics are abundantly illustrated, and their interpretation is based on a review of numerous ethnographic and experimental reference papers. The chaînes opératoires are depicted by trees following a rigorous method of hierarchical data clustering. This allows technical traditions, which are inherited and transmitted among members of social- and spatial based communities, to be reconstr…
Multi-channel search for squarks and gluinos in root s=7 TeV pp collisions with the ATLAS detector at the LHC
2013
A search for supersymmetric particles in final states with zero, one, and two leptons, with and without jets identified as originating from b-quarks, in 4.7 fb[superscript −1] of √s = 7 TeV pp collisions produced by the Large Hadron Collider and recorded by the ATLAS detector is presented. The search uses a set of variables carrying information on the event kinematics transverse and parallel to the beam line that are sensitive to several topologies expected in supersymmetry. Mutually exclusive final states are defined, allowing a combination of all channels to increase the search sensitivity. No deviation from the Standard Model expectation is observed. Upper limits at 95 % confidence level…
Buffalaxed Super-diversity: Representations of the Other on YouTube
2013
Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo
2019
We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August. We have analyzed 98 gamma-ray bursts using an unmodeled search method that searches for generic transient gravitational waves and 42 with a modeled search method that targets compact-binary mergers as progenitors of short gamma-ray bursts. Both methods clearly detect the previously reported binary merger signal GW170817, with p-values of <9.38 10-6 (modeled) and 3.1 10-4 (unmodeled). We do not find any significant evidence for gravitational-wave signals associate…
Jaunākā pirmsskolas vecuma bērnu emocionālās atsaucības sekmēšana rotaļās
2018
Kvalifikācijas darba temats ir: “Jaunākā pirmsskolas vecuma bērnu emocionālās atsaucības sekmēšana rotaļās”. Darba mērķis ir pētīt jaunākā pirmsskolas vecuma bērnu emocionālās atsaucības veicināšanu ar rotaļām. Darba autore ir LU studente Zane Straupe. Darba vadītāja ir docente Inga Stangaine. Darbs sastāv no divām daļām – teorētiskās un praktiskās daļas. Teorētiskajā daļā tiek analizēta bērnu emocionālās atsaucības veidošanās dažādu autoru skatījumā. Tiek sniegts emociju un jūtu vispārīgs raksturojums pedagogu un psihologu teorijās, kā arī atziņas 2 - 3 g. vecuma bērnu specifiku šajā sakarā. Tiek apskatītas pedagogu un psihologu atziņas par 2 – 3 g. bērnu vecumposma īpatnībām, attīstību. V…