Search results for "Deute"
showing 10 items of 549 documents
1981
The proton spin-lattice relaxation time T1 was determined at 13,8, 55,2, and 90 MHz in polystyrene (PS-d0) and polystyrene deuterated at the chain (PS-d3) and the phenyl groups (PS-d5), respectively, at temperatures between −130 and +230°C. Furthermore, T1 was measured in isotopic mixtures of PS-d3 and fully deuterated PS-d8 where a separation into intramolecular and intermolecular contributions was possible through the deuteron dilution technique. Above 130°C, various distributions of correlation times provide a semiquantitative understanding of the different motins seen by the protons of the partially deuterated systems. Rotating frame relaxation times in PS-d3 and PS-d5 reveal librationa…
Deute públic i renda censalista al País Valencià en el segle XV. Una proposta d’interpretació
2018
L’emergència de la nova fiscalitat –de la Corona, de les ciutats i del regne– va ser, sens dubte, una de les grans transformacions polítiques i econòmiques del final de l’edat mitjana. Amb l’impost va aparèixer un deute públic consolidat que, en la Corona d’Aragó, es va desenvolupar mitjançant el censal, un instrument financer semblant a les rentes constituées franceses o les perpetual annuities angleses. A partir del cas del País Valencià, pot assajar-se una estimació del volum de rendes generat pel deute públic i de com es distribuïen des del punt de vista geogràfic i social. Així doncs, en aquest article s’estudia en quins nivells de la xarxa urbana es concentraven aquests recursos i qui…
Pràctica 8. Colorimetria triestímul II. Tests de visió de color
2018
El document forma part dels materials docents programats mitjançant l'ajut del Servei de Política Lingüística de la Universitat de València. Pràctica 8 de l'assignatura de psicofísica de la visió on l'objectiu és realitzar tests de làmines pseudoisocromàtiques, per a detectar i gradar defectes congènits de la visió del color, treballant a l’espai CIEXYZ1931
High Current Proton and Deuteron Beams for Accelerators and Neutron Generators
2014
This paper presents the latest results of high current proton and deuteron beam production at SMIS 37 facility at the Institute of Applied Physics (IAP RAS). In this experimental setup the plasma is created and the electrons are heated by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap fulfilling the ECR condition. High microwave power and frequency allow sustaining higher density hydrogen plasma (ne up to 2·1013 cm-3) in comparison to conventional ECRIS’s or microwave sources. The low ion temperature, on the order of a few eV, is beneficial to produce proton beams with low emittance. Latest experiments at SMIS 37 were performed using a single-aperture two-electr…
First real–time detection of solar pp neutrinos by Borexino
2014
International audience; Solar neutrinos have been pivotal to the discovery of neutrino flavour oscillations and are a unique tool to probe the reactions that keep the Sun shine. Although most of solar neutrino components have been directly measured, the neutrinos emitted by the keystone pp reaction, in which two protons fuse to make a deuteron, have so far eluded direct detection. The Borexino experiment, an ultra-pure liquid scintillator detector running at the Laboratori Nazionali del Gran Sasso in Italy, has now filled the gap, providing the first direct real time measurement of pp neutrinos and of the solar neutrino luminosity.
Single π0 production off neutrons bound in deuteron with linearly polarized photons
2021
The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina anal…
Measurement of the spin-dependent structure function g1(x) of the deuteron
1993
We report on the first measurement of the spin-dependent structure function g1d of the deuteron in the deep inelastic scattering of polarised muons off polarised deuterons, in the kinematical range 0.006<x<0.6, 1 GeV2<Q2<30 GeV2. The first moment, Γ1d=sh{phonetic}01 g1d dx=0.023±0.020 (stat.) ± 0.015 (syst.), is smaller than the prediction of the Ellis-Jaffe sum rules. Using earlier measurements of g1p, we infer the first moment of the spin-dependent neutron structure function g1n. The difference Γ1p-Γ1n=0.20 ±0.05 (stat.) ± 0.04 (syst.) agrees with the prediction of the Bjorken sum rule, Γ1p-Γ1n=0.191 ±0.002.
Demo: Anomaloscopio
2016
Programa de instalación del software anomaloscopio.exe, que simula un anomaloscopio en un PC. El programa se ha generado con el compilador de Matlab, y deberá instalar Matlab Runtime en el ordenador, para lo que necesitará una conexión de red. El programa anomaloscopio.exe permite determinar el rango de igualación de un paciente y simular el comportamiento de un dicrómata. Los resultados se pueden ver en distintos formatos gráficos (diagrama cromático y curva "luminancia de la referencia" vs. "proporción de los primarios". Programa ejecutable, que simula el funcionamiento de un anomaloscopio en un PC. Se puede elegir una ecuación del anomaloscopio específica para cada tipo de dicromacía (pr…
Study of lecithin reverse micelles by FT-IR spectroscopy
2007
FT-IR spectra of water/lecithin/deuterated cyclohexane microemulsions as a function of water/lecithin molar ratio R (R=[water]/[lecithin]) at various lecithin volume fractions (φ) have been recorded. After elimination of the spectral contributions due to the deuterated cyclohexane and normalization, the band parameters of the CO and PO4 vibrational modes due to lecithin have been found dependent only upon R. This behaviour has been interpreted in terms of a progressive structural modification of the water/lecithin interface superimposed to the progressive hydration of CO and PO4 groups. Moreover, no correlation between the CO and PO4 band parameters and the formation of gel-like micellar so…