97 research outputs found
Optimization of light collection from crystal scintillators for cryogenic experiments
High light collection efficiency is an important requirement in any
application of scintillation detectors. The purpose of this study is to
investigate the possibility for improving this parameter in cryogenic
scintillation bolometers, which can be considered as a promising detectors in
experiments investigating neutrinoless double beta decay and dark matter.
Energy resolutions and relative pulse amplitudes of scintillation detectors
using ZnWO4 scintillation crystals of different shapes (cylinder 20 mm in
dimater by 20 mm and hexagonal prism with diagonal 20 mm and height 20 mm),
reflector materials and shapes, optical contact and surface properties
(polished and diffused) were measured at room temperature. Propagation of
optical photons in these experimental conditions was simulated using Geant4 and
ZEMAX codes. The results of the simulations are found to be in good agreement
with each other and with direct measurements of the crystals. This could be
applied to optimize the geometry of scintillation detectors used in the
cryogenic experiments.Comment: 12 pages, 8 figures, 1 Tabl
Impact of geometry on light collection efficiency of scintillation detectors for cryogenic rare event searches
Simulations of photon propagation in scintillation detectors were performed
with the aim to find the optimal scintillator geometry, surface treatment, and
shape of external reflector in order to achieve maximum light collection
efficiency for detector configurations that avoid direct optical coupling, a
situation that is commonly found in cryogenic scintillating bolometers in
experimental searches for double beta decay and dark matter. To evaluate the
light collection efficiency of various geometrical configurations we used the
ZEMAX ray-tracing software. It was found that scintillators in the shape of a
triangular prism with an external mirror shaped as truncated cone gives the
highest light collection efficiency. The results of the simulations were
confirmed by carrying out measurements of the light collection efficiencies of
CaWO4 crystal scintillators. A comparison of simulated and measured values of
light output shows good agreemen
Milnacipran in treatment of anxiety and depression conditions in patients with chronic dermatosis
The article describes an experience with Ixel (Milnacipran) medicine use in the treatment of anxiety and depression conditions in patients with chronic dermatosis. The results of an open clinical observation of Ixel use in the treatment of Psoriasis, Atopic Dermatitis, Rosacea and Eczema are presented. A detailed description is provided of the chronic dermatology disease diagnosis and condition evaluation scales that helped to prove the efficacy of Ixel. The medicine is recommended for usage in dermatology thanks to its safety, relatively low incidence of side effects and absence of complications.Π Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΡΡΡ ΠΎΠΏΡΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ° ΠΈΠΊΡΠ΅Π» (ΠΌΠΈΠ»Π½Π°ΡΠΈΠΏΡΠ°Π½) ΠΏΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π΄Π΅ΠΏΡΠ΅ΡΡΠΈΠ²Π½ΡΡ
ΡΠΎΡΡΠΎΡΠ½ΠΈΠΉ Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
Ρ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π΄Π΅ΡΠΌΠ°ΡΠΎΠ·Π°ΠΌΠΈ. ΠΡΠΈΠ²ΠΎΠ΄ΡΡΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΎΡΠΊΡΡΡΠΎΠ³ΠΎ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ° Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
Ρ ΠΏΡΠΎΡΠΈΠ°Π·ΠΎΠΌ, Π°ΡΠΎΠΏΠΈΡΠ΅ΡΠΊΠΈΠΌ Π΄Π΅ΡΠΌΠ°ΡΠΈΡΠΎΠΌ, ΡΠΎΠ·Π°ΡΠ΅Π°, ΡΠΊΠ·Π΅ΠΌΠΎΠΉ. ΠΠΎΠ΄ΡΠΎΠ±Π½ΠΎ ΠΎΠΏΠΈΡΠ°Π½Ρ ΠΎΡΠ΅Π½ΠΎΡΠ½ΡΠ΅ ΡΠΊΠ°Π»Ρ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΡΠΎΡΡΠΎΡΠ½ΠΈΠΉ ΠΈ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΠΆΠ½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ; Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΡΡΠΈΡ
ΡΠΊΠ°Π» Π²ΡΡΠ²Π»Π΅Π½Π° Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠ° ΡΠΎΡΡΠΎΡΠ½ΠΈΠΉ ΠΈ ΠΎΡΠ΅Π½Π΅Π½Π° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈΠΊΡΠ΅Π»Π°. Π ΡΠ²ΡΠ·ΠΈ Ρ Π΅Π³ΠΎ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΡΡ ΠΈ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΌΠ°Π»ΡΠΌ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎΠΌ ΠΏΠΎΠ±ΠΎΡΠ½ΡΡ
ΡΡΡΠ΅ΠΊΡΠΎΠ², ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ΠΌ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ, ΠΏΡΠ΅ΠΏΠ°ΡΠ°Ρ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΠΎΠ²Π°Π½ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π² Π΄Π΅ΡΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ
New limits on , and decay of Ce and Ce with deeply purified cerium sample
A search for double electron capture (), electron capture with
positron emission (), and double positron emission
) in Ce and Ce was realized with a 465 cm
ultra-low background HP Ge spectrometer over 2299 h at the Gran Sasso
underground laboratory. A 627 g sample of cerium oxide deeply purified by
liquid-liquid extraction method was used as a source of quanta
expected in double decay of the cerium isotopes. New improved half-life
limits were set on different modes and channels of double decay of
Ce and Ce at the level of yr.Comment: 19 pages, 6 figures, 2 table
Improvement of radiopurity level of enriched CdWO and ZnWO crystal scintillators by recrystallization
As low as possible radioactive contamination of a detector plays a crucial
role to improve sensitivity of a double beta decay experiment. The radioactive
contamination of a sample of CdWO crystal scintillator by thorium
was reduced by a factor , down to the level 0.01 mBq/kg
(Th), by exploiting the recrystallization procedure. The total alpha
activity of uranium and thorium daughters was reduced by a factor ,
down to 1.6 mBq/kg. No change in the specific activity (the total
activity and Th) was observed in a sample of ZnWO crystal produced
by recrystallization after removing mm surface layer of the
crystal.Comment: 14 pages, 5 figures and 2 table
Possibilities of using computed tomography to treat mixed cervical dystonia with botulinum toxin type A
The paper describes a clinical case demonstrating the possibilities of using computed tomography (CT) in the diagnosis and treatment of botulinum toxin type A (BTA) treatment of mixed cervical dystonia (CD). The poor result of initial treatment is due to the fact that the abnormally active deep muscles of the neck were beyond the reach of injection. Routine clinical examination cannot identify a concurrence of the caput and collis types of CD in most cases, which occurred in our patient. Objective examination revealed displacement of the larynx to the left from the incisura thyroidea superior, which was characteristic of the left-sided rotational caput type of CD; however, CT detected mixed CD (a concurrence of torticollis and torticaput in the left). Cervical spine CT could visualize not only the superficial, but also deep dystonic muscles of the neck, specify a botulinum toxin therapy regimen, and estimate a difference in the volumes of the normal or dystonic inferior oblique muscle of the head with further intramuscular administration of botulinum toxin. The evaluation of the efficiency and safety of BTA therapy for this disease, as well as practical guidelines for the use of CT in the diagnosis and treatment of mixed CD are given
A clinical case of a patient with probable cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) from Chuvashia
Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) syndrome is a congenital small-vessel disease running with recurrent lacunar infarcts and leading to gradually progressive subcortical, pseudobulbar, and cerebellar syndromes and dementia. Neuroimaging reveal multiple lacunar infarcts in the basal ganglia, thalamus, pons Varolii, and cerebral hemispheric white matter, as well as cerebral atrophy. The specific feature of the disease is white matter lesion adjacent to the temporal horns of the lateral ventricles and to the external capsules. The paper describes a patient with CADASIL syndrome. The latter runs a progressive course and includes the following neurological disorders: cognitive, pyramidal, extrapyramidal, and axial ones. This clinical case was differentially diagnosed with multiple sclerosis, including with consideration for neuroimaging findings. The CADASIL syndrome is a rare potentially menacing neurological condition that is observed in young patients and requires a detailed examination using current diagnostic techniques
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