Graphic
Triselenium dicyanide is formed by the interaction of malononitrile and selenium dioxide in dimethylsulfoxide or dimethylformamide. Addition of aromatic amines, indoles and some active ...methylene compounds to this reaction mixture gives the corresponding selenocyanates in one-pot.
The electromagnetic calorimeter of PANDA at the FAIR facility will rely on the operation of lead tungstate (PbWO
4, PWO) scintillating crystals at temperatures near
-
25
∘
C
to provide sufficient ...resolution for photons in the energy range from 8
GeV down to 10
MeV. The radiation hardness of PWO crystals was studied at the IHEP (Protvino) irradiation facility in the temperature range from
+
20
∘
C
(room temperature) down to
-
23
∘
C
. These studies have indicated significantly different behavior in the time evolution of the damaging processes well below room temperature. Different signal loss levels at the same dose rate but at different temperatures were observed. The effect of a deep suppression of the crystal recovery process at temperatures below
0
∘
C
has been seen.
The GAMMA-400 gamma-ray telescope currently under development is designed to measure fluxes of gamma rays and electron-positron cosmic-ray components, which could be associated with the annihilation ...or decay of dark matter particles, and to survey in detail the celestial sphere in order to search for and investigate discrete gamma-ray sources; to measure the energy spectra of Galactic and extragalactic dif- fuse gamma-ray emissions; and to study gamma-ray bursts and the gamma-ray emissions of active Sun. The GAMMA-400 energy range is 100 MeV to 3000 GeV. The gamma-ray telescope has an angular resolution of ∼0.01°, an energy resolution of ∼1%, and a proton rejection factor of ∼10
6
. The GAMMA-400 will be installed on Russia’s
Navigator
space platform. Observations are planned to commence in 2018.
A new experiment SPASCHARM devoted to a systematic study of polarization phenomena in hadron-hadron interactions in the energy range 10-70 GeV is under preparation at IHEP (Protvino). The physical ...observables will be single-spin asymmetries, hyperon polarizations and spin-density matrix elements. A universal setup will detect and identify various neutral and charge particles in the full azimuthal angle and a wide polar angle range. A polarized target is used to measure the SSA. The SPASCHARM sub-detectors are being designed and constructed now. The possibility of obtaining a polarized proton beam for the SPASCHARM experiment from Lambda decays is under study.
To investigate the complications of intestinal stoma in children and to develop measures for decrease of their incidence.
The study included 152 children with congenital and acquired gastrointestinal ...pathology requiring surgical treatment with the imposition of intestinal stoma. Atresia of intestinal tube was observed in 28 (18.4%) children, meconium ileus - in 10 (6.6%) cases, Hirschsprung's disease - in 11 (7.2%)cases, anorectal malformations - in 39 (25.7%) cases, multiple malformations - in 11 (7.2%) patients, necrotic enterocolitis - in 56 (36.8%) patients, other reasons - in 7 (4.6%) cases. The average age of patients was 12,3±7,2 days. There were 93 (61.2%) boys and 59 (38.8%) girls. Ileostomy, ileocolostomy and colostomy were made in 37 (24.3%), 46 (30.3%) and 69 (45.4%) cases respectively. Time of intestinal stoma function was 18-217 days.
Early complications were dehiscence in the area of stoma in 4 (2.6%) children, evagination in 7 (4.6%) patients, marginal necrosis of stoma in 2 (1.3%) cases, retraction of stomy into abdominal cavity in 1 (0.6%) child and abdominal skin maceration in 8 (5.2%) patients. Remote complications included dermatitis around stomy in 35 (23.1%) children, stenosis of stoma in 9 (5.9%) cases, evagination of stoma in 12 (7.9%) patients. Also, 5 patients were unable to use the colostomy bag due to vicious overlaying of intestinal stoma. Using the colostomy bags «Coloplast» and skin care products around the stoma significantly reduced (p<0.01) the number of complications at inpatient stage of treatment.
Successful function of stoma depends on not only technical aspects but also obligatory care performance with timely correction of complications.
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