Search results for "FOT"
showing 10 items of 1161 documents
Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHC
2011
A search for the Standard Model Higgs boson in the two photon decay channel is reported, using 1.08 fb−11.08 fb[superscript −1] of proton–proton collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS detector. No significant excess is observed in the investigated mass range of 110–150 GeV. Upper limits on the cross-section times branching ratio of between 2.0 and 5.8 times the Standard Model prediction are derived for this mass range.
Low-diffusion Xe-He gas mixtures for rare-event detection: electroluminescence yield
2020
[EN] High pressure xenon Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification are being proposed for rare event detection such as directional dark matter, double electron capture and double beta decay detection. The discrimination of the rare event through the topological signature of primary ionisation trails is a major asset for this type of TPC when compared to single liquid or double-phase TPCs, limited mainly by the high electron diffusion in pure xenon. Helium admixtures with xenon can be an attractive solution to reduce the electron diffu- sion significantly, improving the discrimination efficiency of these optical TPCs. We have m…
Direct photon production at low transverse momentum in proton-proton collisions at √s = 2.76 and 8 TeV
2019
Measurements of inclusive and direct photon production at midrapidity in pp collisions at √s=2.76 and 8 TeV are presented by the ALICE experiment at the LHC. The results are reported in transverse momentum ranges of 0.47 GeV/c is at least one σ above unity and consistent with expectations from next-to-leading order pQCD calculations. peerReviewed
Analysis of the Photoneutron Field Near the THz Dump of the CLEAR Accelerator at CERN With SEU Measurements and Simulations
2022
We study the radiation environment near the terahertz (THz) dump of the CERN Linear Electron Accelerator for Research (CLEAR) electron accelerator at CERN, using FLUktuierende KAskade in German (FLUKA) simulations and single-event upset (SEU) measurements taken with 32-Mbit Integrated Silicon Solution Inc. (ISSI) static random access memories (SRAMs). The main focus is on the characterization of the neutron field to evaluate its suitability for radiation tests of electronics in comparison with other irradiation facilities. Neutrons at CLEAR are produced via photonuclear reactions, mostly initiated by photons from the electromagnetic cascades that occur when the beam is absorbed by the dump …
Sintesi e caratterizzazione di nuovi sistemi fotoluminescenti nanostrutturati.
2012
Analīzes metožu attīstīšana nātru tēju elementsastāva noteikšanai
2015
Tā kā organiskā materiāla izpēte ar dažādām analīzes metodēm sagādā grūtības, tad šajā darbā tiks izvērtēta analīzes metožu atbilstība dzelzs, kālija un kalcija satura noteikšanai lielo nātru (Urtica dioica L.) tējās. Dzelzs saturs noteikts ar spektrofotometrijas metodi, kālijs un kalcijs – ar liesmas fotometrijas, bet visi 3 elementi – ar rentgenfluorescenses spektrometrijas metodi. Paraugi sagatavoti tablešu formā, ar sauso vai slapjo mineralizāciju. Spektrofotometrijas metode nav piemērota dzelzs, bet liesmas fotometrija – kalcija satura noteikšanai nātru tējās. Kāliju var noteikt precīzi ar abām metodēm. Rentgenfluorescenses spektrometrija ir piemērota visu minēto elementu noteikšanai. …
Peroksīdu noteikšana organiskos šķīdinātājos ar eksprestestu metodi
2019
Peroksīdu noteikšana organiskos šķīdinātājos ar eksprestestu metodi. Dubure A., darba vadītājs Dr. chem., doc. Ģībietis J. Bakalaura darbs, 40 lappuses, 13 tabulas, 18 attēli, 23 literatūras avoti. Latviešu valodā. Darbā aprakstītas dažādas peroksīdu noteikšanas metodes. Veikta eksprestestu WaterWorks (ITS, ASV) ūdeņraža peroksīda un peroksietiķskābes teststrēmeļu kalibrēšana ūdens vidē un organiskos šķīdinātājos ar standartpiedevu metodi, lai noteiktu peroksīdu masas koncentrāciju analizējamajā paraugā. Mērījumos lietots reflektofotometrijas metode, izveidotas krāsu diagrammas ar reflektospektrofotometru AvaMouse Avantes. Pierādīta iespējamība ūdens kontroles eksprestestu „Water Works” (IT…
Síndrome de Cockayne: Informe de un caso: revisión de la literatura
2006
El Síndrome de Cockayne (CS) es un desorden genético con un patrón de herencia autosómico recesivo que fue descrito por primera vez en 1936 por Cockayne. Los pacientes con este síndrome presentan detención del crecimiento, talla baja, envejecimiento prematuro, anormalidades neurológicas, fotosensibilidad, retraso en la erupción de los dientes primarios, ausencia congénita de dientes permanentes, macrodoncia parcial, atrofia de los procesos alveolares y caries dental. Puede ser causado por mutación en dos genes, el CKN1 (ERCC8) y el ERCC6, localizados en los cromosomas 5 y 10 respectivamente; originando dos tipos: CS-A que tienen mutación en ERCC8 y CS-B con mutación en ERCC6, este último pr…
The Human Biodiversity in the Middle of the Mediterranean. Study of native and settlers populations on the Sicilian context
2020
[IT] Negli ultimi 200.000 anni, la specie umana si è diffusa in tutta la Terra, adattando la sua morfologia e fisiologia a un'ampia gamma di habitat. Lo scheletro umano ha quindi registrato i principali effetti ambientali e di conseguenza i reperti scheletrici assumono grande importanza nell'indagine dei processi evolutivi. Oggi le moderne tecniche di indagini quantitative delle principali caratteristiche morfologiche consentono di metterle in relazione con la variabilità genetica. La posizione geografica della Sicilia, l'isolamento e la sua lunga e dinamica storia di colonizzazione (diversi e numerosi contributi culturali e biologici) hanno creato un contesto peculiare che consente uno stu…
L'ombreggiamento dovuto alle ostruzioni Un nuovo metodo fotografico
2013
A new, simplified photographic method is proposed to estimate the shading effects of obstructions. In spite of the complex mathematical background of the new tool, its practical application is very simple, and only requires the measurements of three angles for each photograph. The proposed method is particularly useful for overcoming the difficulties caused by the need to accurately describe surrounding objects to estimate shading effects. The new method uses the information contained in a picture and allows one to draw daily solar paths directly on the photograph. The procedure is useful to verify the suitability of a generic site for solar exploitation; its main benefit is the simplicity …