Search results for "Sst"
showing 10 items of 538 documents
The Two‐Component X‐Ray Broadband Spectrum of X Persei Observed byBeppoSAX
1998
We report temporal and broadband (0.1-200 keV) spectral analysis of the Be/X-ray binary X Persei observed by the Narrow Field Instruments (NFI) on board the BeppoSAX satellite. The source luminosity is ~1.2 × 1034 ergs s-1 in the energy range 0.1-10 keV and ~2.4 × 1034 ergs s-1 in the range 0.1-200 keV. The source shows pulsations from 0.1 keV up to 80 keV. No variations of the pulse profile with energy are visible. The barycentric pulse period is 837.376 ± 0.026 s, in agreement with the secular spin-down observed since 1978. The 0.1-10 keV energy spectrum can be well fitted by a power law plus high-energy cutoff, in agreement with previous observations, although at higher energies a hard e…
Photon Asymmetry of Deuteron Photodisintegration Between 160 and 410 MeV
1999
The photon asymmetry Σ of the reaction has been measured across the photon energy range 160–410 MeV at the Mainz Microtron MAMI. Linearly polarized photons were obtained from coherent bremsstrahlung and their energies were determined with the Glasgow tagging spectrometer. The large acceptance detector DAPHNE enabled the outgoing protons to be measured over the complete azimuthal range and for polar angles from 35° to 155° in the c.m. system. The data are compared with existing results and recent theoretical calculations.
Spin Crossover, Liesst, and Niesst-Fascinating Electronic Games in Iron Complexes
1997
Abstract Coordination compounds of transition metal ions with open-shell electron configurations may exhibit dynamic electronic structure phenomena depending on the nature of the coordinating ligand sphere. The change of spin state with temperature (thermal spin crossover”) and light-induced electron transfer processes leading to long-lived metastable states are among the most fascinating electronic games encountered in transition metal compounds and are presently under intensive study by chemists and physicists. The first part of this lecture will survey briefly some highlights of previous work and present recent results on thermal spin crossover in iron(II) compounds. The second part of t…
Spectral imaging system for money counterfeit detection
2019
A prototype with three different wavelength lasers (448nm, 532nm and 659nm) for money counterfeit illumination, analyzation and detection using RGB crosstalk correction and comparing spectral image ration for different banknote elements will be presented.
Über eine eichung eines 7.5 × 7.5 cm - NaJ(Tl) - Vollkristalls zur absolutzählung flächenförmiger präparate
1966
Abstract The photopeak efficiency and the peak-to-total ratio for a 7.5 × 7.5 cm solid NaI(Tl)-crystal are determined in the range of 0.145–1.33 MeV. The disintegration rates of the disc sources used are known by 4 πβ -and 4 πβ - γ -coincidence measurements. The effect of the disc diameter and the distance source-crystal on the photopeak efficiency is studied thoroughly. The data obtained are compared with those of other authors. The evaluation of the photopeak area is performed in a frequency diagram, a special type of probability scale, in which both parts of the Gaussian curve are represented by straight lines. Hence, corrections for the Compton overlap, bremsstrahlung and background can…
Enhancement of Bremsstrahlung Radiation Generated by Electron Beam Interaction in an Axially-Oriented Scintillator Crystal (Poster)
2019
Since their discovery, scintillator materials have played an important role in nuclear and particle physics, as well as in medical and industrial imaging. [...]
Electron heating, time evolution of bremsstrahlung and ion beam current in electron cyclotron resonance ion sources
2010
This thesis is a study of Electron Cyclotron Resonance Ion Source (ECRIS) plasmas and their properties. The focus has been on time evolution studies of bremsstrahlung emission, ion beam current production and numerical studies of electron heating in ECRIS plasmas. The time scales for reaching steady state bremsstrahlung production at electron energies greater than 30 keV is shown to be on the order of several hundreds of milliseconds. The ion beam currents of different elements are shown to reach steady state before the bremsstrahlung production. It is also demonstrated that by tuning the RF pulse patterns, the so-called preglow transient ion beam currents can be utilized while the amount o…
Molecular Mechanisms of the Crosstalk Between Mitochondria and NADPH Oxidase Through Reactive Oxygen Species—Studies in White Blood Cells and in Anim…
2014
Aims: Oxidative stress is involved in the development of cardiovascular disease. There is a growing body of evidence for a crosstalk between different enzymatic sources of oxidative stress. With the present study, we sought to determine the underlying crosstalk mechanisms, the role of the mitochondrial permeability transition pore (mPTP), and its link to endothelial dysfunction. Results: NADPH oxidase (Nox) activation (oxidative burst and translocation of cytosolic Nox subunits) was observed in response to mitochondrial reactive oxygen species (mtROS) formation in human leukocytes. In vitro, mtROS-induced Nox activation was prevented by inhibitors of the mPTP, protein kinase C, tyrosine kin…
Balsstiesību ekonomiskie kritēriji demokrātijas apstākļos un šīs rīcībpolitikas pārcelšanas iespējas Latvijā
2016
Maģistra darba tēma - Balsstiesību ekonomiskie kritēriji demokrātijas apstākļos un šīs rīcībpolitikas pārcelšanas iespējas Latvijā. Pētījuma mērķis ir salīdzinot un novērtējot vēsturiskos un mūsdienu atzinumus par balsstiesību ierobežojumiem pēc ekonomiskajiem kritērijiem, izstrādāt šīs rīcībpolitikas pārcelšanas Latvijā iespējamos modeļus. Balsstiesību ierobežojumu pēc ekonomiskajiem kritērijiem izpētē tiek izmantota kvalitatīva un kvantitatīva analīze, modelēšanas metode. Pētījums var sniegt kā teorētisku tā arī empīrisku ieguldījumu, teorētiski rodot balsstiesību ierobežojumu pēc ekonomiskajiem kritērijiem rīcībpolitikas pārcelšanas modeļus, praktiski sniedzot prognozi par Latvijas iespē…
Spin crossover properties of the [Fe(PM-BiA)2(NCS)2] complex - phases I and II
2003
International audience; In the present review, we reexamine the photomagnetic properties of the [Fe(PM-BiA)2(NCS)2], cis-bis(thiocyanato)-bis[(N-2'-pyridylmethylene)-4-(aminobiphenyl)]iron(II), compound which exhibits, depending on the synthetic method, an exceptionally abrupt spin transition (phase I) with a very narrow hysteresis (T1/2O = 168 K and T1/2N = 173 K) or a gradual spin conversion (phase II) occurring at 190 K. In both cases, light irradiation in the tail of the 1MLCT-LS absorption band, at 830 nm, results in the population of the high-spin state according to the light-induced excited spin-state trapping (LIESST) effect. The capacity of a compound to retain the light-induced HS…