822 research outputs found
THGEM operation in Ne and Ne/CH4
The operation of Thick Gaseous Electron Multipliers (THGEM) in Ne and Ne/CH4
mixtures, features high multiplication factors at relatively low operation
potentials, in both single- and double-THGEM configurations. We present some
systematic data measured with UV-photons and soft x-rays, in various Ne
mixtures. It includes gain dependence on hole diameter and gas purity,
photoelectron extraction efficiency from CsI photocathodes into the gas,
long-term gain stability and pulse rise-time. Position resolution of a 100x100
mm^2 X-rays imaging detector is presented. Possible applications are discussed.Comment: Submitted to JINST, 25 pages, 33 figure
Supercritical Antisolvent Precipitation of Quercetin Systems: Preliminary Experiments
Flavonoids have attracted a lot of attention due to their antioxidant, antitumor and antibacterial activities. Quercetin (3,5,7,3,4-pentahydroxyflavone) is a polyphenolic flavonoid that shows several biological effects including a strong inhibitory effect on the
growth of several human and animal cancer cell lines and enhances the antiproliferative effect of cisplatin both in-vitro and in-vivo. In spite of a variety of its biological effects. Quercetin is very poorly soluble in water, which has limited its absorption upon oral administration.
As known, the solubility of drug is often due to the increase of the surface/volume ratio which implies the increase of the number of surface atoms (or molecules) with respect to the number of bulk atoms (or molecules). With this aim, we investigated the use
of supercritical antisolvent (SAS) technique for Quercetin microparticles generation finding the best operative conditions through the Peng Robinson’s Equation of State.
The obtained simulation behaviors were confirmed by experimental precipitation: the physicochemical characterizations of the samples were also performe
Supercritical Antisolvent Precipitation of Quercetin Systems: Preliminary Experiments
Flavonoids have attracted a lot of attention due to their antioxidant, antitumor and antibacterial activities. Quercetin (3,5,7,3,4-pentahydroxyflavone) is a polyphenolic flavonoid that shows several biological effects including a strong inhibitory effect on the
growth of several human and animal cancer cell lines and enhances the antiproliferative effect of cisplatin both in-vitro and in-vivo. In spite of a variety of its biological effects. Quercetin is very poorly soluble in water, which has limited its absorption upon oral administration.
As known, the solubility of drug is often due to the increase of the surface/volume ratio which implies the increase of the number of surface atoms (or molecules) with respect to the number of bulk atoms (or molecules). With this aim, we investigated the use
of supercritical antisolvent (SAS) technique for Quercetin microparticles generation finding the best operative conditions through the Peng Robinson’s Equation of State.
The obtained simulation behaviors were confirmed by experimental precipitation: the physicochemical characterizations of the samples were also performe
Abiraterone acetate in metastatic castration-resistant prostate cancer after chemotherapy. A retrospective “Real Life” analysis of activity and safety
Abiraterone acetate (AA) is a potent, selective androge (CYP17) biosynthesis inhibitor, which showed to improve overall survival (HR = 0.646) in mCRPC patients progressing after docetaxel. In this retrospective analysis we assessed the safety and efficacy of AA in patients affected with mCRPC progressing after chemotherapy, treated in the normal clinical practice, in several Italian Oncologic Units, after the approval of the drug from the Italian Drug Agency (AIFA)
Constructing Independently Verifiable Privacy-Compliant Type Systems for Message Passing between Black-Box Components
Privacy by design (PbD) is the principle that privacy should be considered at
every stage of the software engineering process. It is increasingly both viewed
as best practice and required by law. It is therefore desirable to have formal
methods that provide guarantees that certain privacy-relevant properties hold.
We propose an approach that can be used to design a privacy-compliant
architecture without needing to know the source code or internal structure of
any individual component. We model an architecture as a set of agents or
components that pass messages to each other. We present in this paper
algorithms that take as input an architecture and a set of privacy constraints,
and output an extension of the original architecture that satisfies the privacy
constraints
MPGDs in Compton imaging with liquid-xenon
The interaction of radiation with liquid xenon, inducing both scintillation
and ionization signals, is of particular interest for Compton-sequences
reconstruction. We report on the development and recent results of a
liquid-xenon time-projection chamber, dedicated to a novel nuclear imaging
technique named "3 gamma imaging". In a first prototype, the scintillation is
detected by a vacuum photomultiplier tube and the charges are collected with a
MICROMEGAS structure; both are fully immersed in liquid xenon. In view of the
final large-area detector, and with the aim of minimizing dead-zones, we are
investigating a gaseous photomultiplier for recording the UV scintillation
photons. The prototype concept is presented as well as preliminary results in
liquid xenon. We also present soft x-rays test results of a gaseous
photomultiplier prototype made of a double Thick Gaseous Electron Multiplier
(THGEM) at normal temperature and pressure conditions.Comment: presented at MPGD09, CRETE, June 2009; to be published in JINST
Proceedings, PDF, 10 pages, 11 figure
Inverted metallicity gradients in two Virgo cluster star-forming dwarf galaxies: evidence of recent merging?
We present integral field spectroscopy observations of two star-forming dwarf
galaxies in the Virgo cluster (VCC135 and VCC324) obtained with PMAS/PPak at
the Calar Alto 3.5 meter telescope. We derive metallicity maps using the N2
empirical calibrator. The galaxies show positive gas metallicity gradients,
contrarily to what is usually found in other dwarfs or in spiral galaxies. We
measure gradient slopes of 0.20 0.06 and 0.15 0.03 dex/ for
VCC135 and VCC324, respectively. Such a trend has been only observed in few,
very isolated galaxies, or at higher redshifts ( 1). It is thought to be
associated with accretion of metal-poor gas from the intergalactic medium, a
mechanism that would be less likely to occur in a high-density environment like
Virgo. We combine emission line observations with deep optical images to
investigate the origin of the peculiar metallicity gradient. The presence of
weak underlying substructures in both galaxies and the analysis of
morphological diagnostics and of ionised gas kinematics suggest that the inflow
of metal-poor gas to the central regions of the dwarfs may be related to a
recent merging event with a gas-rich companion.Comment: 13 pages, 9 figures, MNRAS in press. V2: minor figure revisions and
minor title change
On the operation of a Micropattern Gaseous UV-Photomultiplier in Liquid-Xenon
Operation results are presented of a UV-sensitive gaseous photomultiplier
(GPM) coupled through a MgF2 window to a liquid-xenon scintillator. It
consisted of a reflective CsI photocathode deposited on top of a THick Gaseous
Electron Multiplier (THGEM); further multiplication stages were either a second
THGEM or a Parallel Ionization Multiplier (PIM) followed by a MICROMEsh GAseous
Structure (MICROMEGAS). The GPM operated in gas-flow mode with non-condensable
gas mixtures. Gains of 10^4 were measured with a CsI-coated double-THGEM
detector in Ne/CH4 (95:5), Ne/CF4 (95:5) and Ne/CH4/CF4 (90:5:5), with soft
X-rays at 173 K. Scintillation signals induced by alpha particles in liquid
xenon were measured here for the first time with a double-THGEM GPM in He/CH4
(92.5:7.5) and a triple-structure THGEM/PIM/MICROMEGAS GPM in Ne/CH4 (90:10)
with a fast-current preamplifier.Comment: 12 pages, 9 figures, submitted to JINS
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