Search results for "Proton"
showing 10 items of 5886 documents
Electrode–Electrolyte Compatibility in Solid-Oxide Fuel Cells: Investigation of the LSM–LNC Interface with X-ray Microspectroscopy
2015
Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first…
PRELIMINARY-OBSERVATIONS OF METABOLIC CHARACTERIZATION OF BILATERAL TEMPORAL EPILEPTIC FOCUS, USING PROTON MAGNETIC-RESONANCE SPECTROSCOPY - 3 CASES
1994
International audience; Abstract: The authors report the case of 3 patients with bilateral temporal lobe epilepsy demonstrated by EEG and sphenoidal electrodes. Two out of the 3 patients presented with childhood febrile convulsions. Their neurological and mental examination was normal. EEG showed spikes within the anterior part of the 2 temporal lobes. CT scan and MRI showed no atrophic lesion within the 2 temporal lobes. Proton magnetic resonance spectroscopy, performed within a cube of 8 cube-centimetres localized in the anterior part of the 2 temporal lobes showed a significant decrease of N-acetyl-aspartate in the 2 temporal lobes of the 3 cases, compared with controls matched with age,…
Gastroezofageālā atviļņa slimība un tās ārstēšanai paredzēto medikamentu aprite triju Latvijas pilsētu aptiekās
2018
Gastroezofageālā atviļņa slimība ik gadu skar arvien vairāk pacientu. Šī slimība raksturojas ar antiatviļņa barjeru izmaiņām, ieskaitot barības vada gļotādas bojājumu, hiatālo trūci, barības vada apakšējā sfinktera atslābšanu. Biežāk simptomi izpaužas sievietēm nekā vīriešiem, kā arī līdz ar vecumu tie izpaužas vairāk. Maģistra darba mērķis ir apkopot un analizēt gastroezofageālā atviļņa slimībai paredzēto medikamentu apriti trīs aptiekās Rīgā, Rēzeknē un Liepājā laika posmā no 2016. gada 1. janvāra līdz 2017. gada 31. decembrim, kā arī veikt gastroeneterologu un sabiedrības anketēšanu. Visbiežāk konstatētā diagnoze ir K21.9 (gastroezofageālā refluksslimība bez ezofagīta) 51 – 60 gadu vecum…
Hlornitrobenzoskābes izomēru pašasociācijas eksperimentālie un teorētiskie pētījumi un kristalizācijas kontroles iespējas
2017
Hlornitrobenzoskābes izomēru pašasociācijas eksperimentālie un teorētiskie pētījumi un kristalizācijas kontroles iespājas. Kresse I. Darba vadītājs Dr. Chem. Bērziņš A. Bakalaura darbs, 45 lapaspuses, 28 attēli, 5 tabulas, 24 literatūras avoti, 4 pielikumi. Latviešu valodā. Darba literatūras daļā apskatīta homogēnā un heterogēnā nukleācija, IS spektroskopija, 1H – KMR spektroskopija un pulveru rentgendifraktometrija. Darbā veikta potenciālās enerģijas virsmas skenēšana 2C4NBA un 4C2NBA molekulām, veikti pašasociāciju pētījumi 5 CNBA izomēriem, uzņemot dažādu koncentrāciju dimetilsulfoksīda-d6 un metanola-d4 šķīdumu protonu kodolmagnētiskās rezonanses spektrus. Izmantojot datorprogrammu Gaus…
Implementation of advanced methodologies in the commissioning of a Light Ion Beam Therapy facility
Measurement of Wγ and Zγ production in proton-proton collisions at √s =7 TeV with the ATLAS detector
2011
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM
Nuclear structure functions at a future electron-ion collider
2017
The quantitative knowledge of heavy nuclei's partonic structure is currently limited to rather large values of momentum fraction $x$---robust experimental constraints below $x\ensuremath{\sim}{10}^{\ensuremath{-}2}$ at low resolution scale ${Q}^{2}$ are particularly scarce. This is in sharp contrast to the free proton's structure which has been probed in Deep Inelastic Scattering (DIS) measurements down to $x\ensuremath{\sim}{10}^{\ensuremath{-}5}$ at perturbative resolution scales. The construction of an electron-ion collider (EIC) with a possibility to operate with a wide variety of nuclei, will allow one to explore the low-$x$ region in much greater detail. In the present paper we simula…
Sensitivity of EDM experiments in paramagnetic atoms and molecules to hadronic CP violation
2020
Experiments searching for the electric dipole moment (EDM) of the electron $d_e$ utilise atomic/molecular states with one or more uncompensated electron spins, and these paramagnetic systems have recently achieved remarkable sensitivity to $d_e$. If the source of $CP$ violation resides entirely in the hadronic sector, the two-photon exchange processes between electrons and the nucleus induce $CP$-odd semileptonic interactions, parametrised by the Wilson coefficient $C_{SP}$, and provide the dominant source of EDMs in paramagnetic systems instead of $d_e$. We evaluate the $C_{SP}$ coefficients induced by the leading hadronic sources of $CP$ violation, namely nucleon EDMs and $CP$-odd pion-nu…
Particle Physics in High School: A Diagnose Study
2016
Abstract The science learning process improves when the contents are connected to students' lives. Particle physics has had a great impact in our society in the last years and has changed the theoretical picture about matter fundamental dynamics. Thus, we think that academic contents about matter components and interactions should be updated. With this study we aim to characterize the level of knowledge of high school students about this topic. We built a test with questions about classical atomic models, particle physics, recent discoveries, social implications and students opinions about it. Contrary to our first suspicion, students' answers show a high variability. They have new physics …
Baryogenesis and dark matter from B mesons
2019
We present a new mechanism of Baryogenesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from neutral $B$ meson oscillations and subsequent decays. This set-up is testable at hadron colliders and $B$-factories. In the early Universe, decays of a long lived particle produce $B$ mesons and anti-mesons out of thermal equilibrium. These mesons/anti-mesons then undergo CP violating oscillations before quickly decaying into visible and dark sector particles. Dark matter will be charged under Baryon number so that the visible sector baryon asymmetry is produced without violating the total baryon number of the Universe. The produced baryon a…