614 research outputs found
Spectral analysis of X-ray pulsars with the INTEGRAL observatory
We studied spectra for 34 accretion-powered X-ray and one millisecond pulsars that were within the field of view of the INTEGRAL observatory over two years (December 2002 - January 2005) of its in-orbit operation and that were detected by its instruments at a statistically significant level (>8 sigma in the energy range 18-60 keV). There are seven recently discovered objects of this class among the pulsars studied: 2RXP J130159.6-635806, IGR/AX J16320-4751, IGR J16358-4726, AX J163904-4642, IGR J16465-4507, SAX/IGR J18027-2017 and AX J1841.0-0535. We analyze the evolution of spectral parameters as a function of the intensity of the sources and compare these with the results of previous studies
«Конструктор здоровья». Обобщение опыта формирования здоровьесозидающей среды в школе в МАОУ СОШ №11 г. Екатеринбурга
Primary prevention, aimed at the formation of value relation to health is an effective method of education of schoolchildren . Our work system includes modularity in the choice of topics and forms of events and records the age of the audience. Active assistants in promoting the preservation of health are members of the school scientific society. Collective projects, in which participants are students of different ages – effective form of promotion of the values of healthПервичная профилактика, направленная на формирование ценностного отношения к здоровью, является эффективным методом обучения школьников. Наша система включает в себя модульность в выборе тем и форм событий с учетом возраста аудитории. Активными помощниками в продвижении идеи сохранения здоровья являются члены школьного научного общества. Коллективные проекты, в которых принимают участие школьники разных возрастов – эффективная форма продвижения ценностей здоровь
Using high-chromium iron as material for production of the equipping components of mine shafts
This paper deals with service conditions of shaft equipment, in particular, inserts of sliding bearings for the purpose of increasing service life due to material substitution and wear resistance increase. As a new material high-chromium irons are offered. Studies are conducted on a microstructure and wear resistance of prototypes is measured. Experimental data are treated by methods of mathematical statistics which confirm reliability of results. The results obtained make it possible to suggest using high-chromium irons as the direct material to produce inserts of sliding bearings
Cobalt(II) and copper(II) complexes with carboxylic acids, imidazole, and 2-methylimidazole
The compositions of [MIm(MeIm)x]L complexes synthesized by the reaction of cobalt(II) and copper(II) fumarates ML · nH2O with imidazole (Im) and 2-methylimidazole (MeIm) were determined. The thermal decomposition of the salts was analyzed, and the pyridine nitrogen atom of imidazole and the oxygen atoms of carboxyl anions were shown to participate in complexation using electronic absorption spectra and IR spectra. The composition and stability of cobalt(II) and copper(II) imidazolatesuccinate complexes in an aqueous solution were determined photometrically and spectrophotometrically, and their higher stability in comparison with monoligand complexes was demonstrated
Economic concept of food development of Russian market
At present, the Russian economy is developing in the conditions of imposed sanctions on high-tech means of production by foreign countries.
In this situation, the development vector is the formation of import substitution policies and the solution of food safety issues for various types of food products that are strategically important for human life.
Meeting the needs of the country's population with its own production is a priority for the development of the agrarian market, which makes it possible to develop the production agrarian sector, the processing and trade sphere, to create additional jobs, thereby improving the quality and standard of living of people.peer-reviewe
Peculiar nature of hard X-ray eclipse in SS433 from INTEGRAL observations
The analysis of INTEGRAL observations (2003-2008) of superaccreting galactic
microquasar SS433 at precessional phases with the maximum disk opening angle is
carried out. The shape and width of the primary X-ray eclipse is found to be
strongly variable suggesting additional absorption in dense stellar wind and
gas outflows from the optical A7I-component. The joint modeling of X-ray
eclipse and precessional X-ray variability by a geometrical model suggests the
binary mass ratio q=m_x/m_v=0.3, allowing an explnation of peculiarities of the
optical variability of SS433, in particular, the substantial precessional
variability at the primary optical eclipse minimum. For the mass function of
the optical star f_v=0.268 M_\odot as derived from Hillwig and Gies (2008)
data, the obtained q yields the masses of the components m_x=5 M_\odot, m_v=15
M_\odot, confirming the black hole nature of the relativistic object in SS433.
The independence of the observed hard X-ray spectrum on the precession phase
suggests that hard X-ray emission is formed in an extended hot corona. The
Monte-Carlo simulations of the broadband X-ray spectrum of SS433 at the maximum
disk opening precessional phases allowed us to determine physical parameters of
the corona (temperature T_{cor}=20 keV, Thomson optical depth \tau=0.2), and to
estimate the jet mass outflow rate \dot M_j=3\times 10^{19} g/s yielding the
kinetic power of the jets \sim 10^{39} erg/s.Comment: 12 pages, 10 figures, Proc. 7th INTEGRAL Workshop, Copenhagen, 8-11
September 200
Study of the Fast X-Ray Transient XTE J1901+014 Based on INTEGRAL, RXTE and ROSAT Data
The source XTE J1901+014 discovered by the RXTE observatory during an intense
outburst of hard radiation and classified as a fast X-ray transient is studied.
The source's spectral characteristics in the quiescent state have been
investigated for the first time both in the soft X-ray energy range (0.6-20
keV) based on ROSAT and RXTE data and in the hard energy range (>20 keV) based
on INTEGRAL data. A timing analysis of the source's properties has revealed
weak nonperiodic bursts of activity on time scales of several tens of seconds
and two intense (0.5-1 Crab) outbursts more than several hundred seconds
in duration. Certain assumptions about the nature of the object under study are
made.Comment: 19 pages, 7 figure
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