scholarly journals Astronomical observatory of Taras Shevchenko National University of Kyiv in 2019

2020 ◽  
pp. 33-35
Author(s):  
V. Efimenko
Keyword(s):  
Solar System ◽  
Magnetic Fields ◽  
High Energy ◽  
Astronomical Observatory ◽  
Small Scale ◽  
Full Time ◽  
Small Bodies ◽  
Part Time ◽  
Mathematical Sciences ◽  
The Village

In 2019, the Astronomical Observatory had 48 full-time employees and 11 part-time employees. A total of 59 employees, including 34 scientists, including 24 full-time (6 doctors of sciences and 16 candidates of sciences) and 10 part-time employees (1 doctor and 3 candidates of sciences). The observatory consists of the Department of Astrophysics (Head of the Department, Doctor of Physical and Mathematical Sciences, Professor VI Zhdanov), the Department of Astrometry and Small Bodies of the Solar System (Head of the Department, Candidate of Physical and Mathematical Sciences Lukyanyk IV.), and 2 observation stations (the village of Lisnyky, the village of Pylypovychi). During the year, 4 budget topics were implemented. The main scientific results. The active nuclei of galaxies have been identified, which are potential sources of extremely high-energy cosmic rays, taking into account energy losses and the influence of magnetic fields on the way to Earth (distance up to 300 million light-years). A large array of observational data of small bodies of the solar system on the 6th (SAO RAS), 4.1th SOAR (Chile), 2.6th (KrAO), 2nd (Terskol), 2nd (OPTICON), 1.3th (AI SAN), 0.70th and 0.48th (v. Lisnyky) telescopes. The reliability of Stokes diagnostics methods of small-scale magnetic fields of the Sun’s photosphere in the interpretation of spectropolarimetric observations of the infrared line Si I 1082.7 nm on modern (VTT, SST, GREGOR) and future (DKIST, EST with a diameter of 4 m) ground telescopes estimated. Published 2 monographs, 65 scientific articles, 25 of them in foreign publications; made 75 reports at scientific conferences.

scholarly journals Аstronomical observatory of Taras Shevchenko National University of Kyiv in 2018

2019 ◽  
pp. 48-51
Author(s):  
V. Efimenko
Keyword(s):  
Cosmic Rays ◽  
Solar System ◽  
High Energy ◽  
Astronomical Observatory ◽  
Small Bodies ◽  
Fundamental Physics ◽  
Potential Source ◽  
National University ◽  
Wave Research ◽  
Scientific Results

At the beginning of 2017, 53 workers worked in the State Astronomical Observatory, of which 28 were scientists, including 6 doctors of sciences and 17 candidates of sciences. The structure of the observatory includes the sector astrometry and the small bodies of the solar system (the head of the sector is Kleshchonok V.V., Ph.D), the department of astrophysics (the head of the department is professor Zhdanov V.I., doctor of Science) and 2 observation stations (Lisnyky, Pylypovychi). During the year budget topics were carried out: “Fundamental physics and models of high-energy astrophysical phenomena”, scientific leader professor Zhdanov V.I., doctor of Science; “Cosmic factors of terrestrial cataclysms: observation, analysis, informatization”, scientific leader Rosenbush V.K., doctor of Science. Young scientists of the Observatory won the competition for financing the youth theme “Multi-wave research of cosmic sources of gamma radiation in the framework of the STA project”, scientific leader Ponomarenko V.O., Ph.D. Main scientific results. The potential source of the triplet of cosmic rays with energies above 1020 eV – magnetar SGR 1900 + 14 is found. The possible manifestations of the acceleration of the cosmic rays by the remnant of the Nebula, in which the magnetar SGR 1900 + 14 was born, was investigated. In order to monitor potentially dangerous bodies of the solar system at the observatory station (Lisnyky) 3323 observations were received from 70 comets and 103 asteroids, 3 new asteroids (2017 ST39, 2017 SV39, 2017 TS7) were officially confirmed by the International Center for Small Planets. In 2017, the staff of the Observatory published 4 monographs, 81 scientific articles, 36 of them in foreign publications; 78 reports have been made at 12 conferences.

scholarly journals FISH COMMUNITY COMPOSITION INDICATES LOW IMPACT OF CAPTURE EFFORTS IN WAR-TORN SOUTH SUDAN

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Luca Luiselli ◽  
John Sebit Benansio ◽  
Johnson J. Balli ◽  
Daniele Dendi ◽  
Stephanie Ajong ◽  
...  
Keyword(s):  
Fish Community ◽  
Group Discussion ◽  
South Sudan ◽  
Good Health ◽  
Small Scale ◽  
Full Time ◽  
Dominant Type ◽  
Fishing Vessels ◽  
Part Time ◽  
White Nile

A survey conducted in Terekeka, Mongalla (=Mongalla) and Gemmaiza (= Gemeiza), payams of Central Equatoria in South Sudan using face-to-face interviews, structured questionnaire and focused group discussion provided information on income generating strategies of fishing communities. These included: full time or part time fishing, small-scale farming, cattle breeding and firewood collection. Stationary gill nets were the dominant type of fishing gear, followed by  monofilament, hook and long line, cast nets, spears and harpoons. Fishing vessels included planked canoes, steel boats and fibreglass. The best fishing months were August, September, followed by May. Main species caught included large bodied potamodromous predators adapted to channel habitats, as well as floodplain migrants. Overall the fish community appeared to be at equilibrium, with no evidence of impacts due to excessive catch efforts. The good health of the White Nile fishery is related to the high resilience of South Sudanese aquatic ecosystems as well as to the low potential of fish capture in a country disrupted by war and lack of security.

scholarly journals Comment: Agricultural Economics Research and Extension Needs of Small-Scale, Limited-Resource Farmers

1979 ◽  
Vol 11 (1) ◽  
pp. 57-59 ◽  
Author(s):  
Ben L. Perry
Keyword(s):  
Value Added ◽  
Limited Resource ◽  
Future Research ◽  
Small Scale ◽  
Full Time ◽  
Small Farms ◽  
Small Farm ◽  
Social Scientists ◽  
Research Areas ◽  
Part Time

West is to be commended for (1) the organization of his discussion, (2) the careful delineation of the research areas, (3) the thoroughness of his research and the excellent documentation of the research efforts of social scientists in treating the problem/s of the small-farm operator, and (4) the development of a means-end schema of “what is,” “what ought to be” with implications for future research, programs, and public policy.As West indicates, there is need for a redefinition of small farm. The $20,000 gross sales limit is inadequate. Most definitions do not include the value added of products produced and consumed by the family. Some states, for example Florida, use figures much lower than $20,000 to characterize small farms. The distinction between full-time and part-time farmers and their incomes is not clearly delineated. A national concern should be the redefinition of the term, “small farm.” Heterogeneous characteristics of small farms should not inhibit the generation of profile information by geographic regions.

Technology adoption by small-scale full-time and part-time family farm households in the subtropics of Jammu & Kashmir

2018 ◽  
Vol 31 (2) ◽  
pp. 259
Author(s):  
Rajinder Peshin ◽  
Rakesh Sharma ◽  
Raj Kumar ◽  
Laxmi K Sharma ◽  
Sudhakar Dwivedi ◽  
...  
Keyword(s):  
Technology Adoption ◽  
Farm Households ◽  
Small Scale ◽  
Family Farm ◽  
Full Time ◽  
Part Time

scholarly journals Costs and returns to rabbit production in Ijebu-Ode LGA, Ogun state

2021 ◽  
Vol 30 (2) ◽  
pp. 229-235
Author(s):  
K. A. Akanni ◽  
M. Y. Odubena
Keyword(s):  
Analytical Techniques ◽  
Descriptive Statistics ◽  
Rate Of Return ◽  
Economic Viability ◽  
Small Scale ◽  
Full Time ◽  
Net Income ◽  
Ogun State ◽  
Part Time

This paper investigated the economic viability of rabbit production in ljebu-Ode LGA of Ogun State, Nigeria. A total of forty (40) small-scale rabbit farmers were purposively selected for the study and the collected data were analyzed using both descriptive statistics and budgetary analytical techniques. The results of the analyses showed that all the studied farmers were literate and they were averagely 27 years of age with mean farming experience of five years. The majority (87.5%) were part-time male farmers while others were on full-time practices. Rabbit rearing in the study area was found to be profitable with a profitability index of 0.43 and average annual net income of ₦8,792.42. The rate of return on the investment was 405.65%, 11,793.84% on fixed items and 520.23% on variable items. The farm net income was estimated to be N 8,433.90.

scholarly journals High-energy Galactic phenomena and the interstellar medium

1985 ◽  
Vol 106 ◽  
pp. 225-233
Author(s):  
Catherine J. Cesarsky
Keyword(s):  
Magnetic Fields ◽  
Interstellar Medium ◽  
Molecular Hydrogen ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
High Energy ◽  
Small Scale ◽  
The Galaxy ◽  
Γ Rays ◽  
Γ Ray

Gamma rays of energy in the range 30 MeV-several GeV, observed by the satellites SAS-2 and COS-B, are emitted in the interstellar medium as a result of interactions with gas of cosmic-ray nuclei in the GeV range (π° decay γ rays) and cosmic-ray electrons of energy > 30 MeV (bremsstrahlung γ rays). W. Hermsen has presented at this conference the γ ray maps of the Galaxy in three “colours” constructed by the COS-B collaboration; the information in such maps is supplemented by radio-continuum studies (see lecture by R. Beck), and is a useful tool for studying the distribution of gas, cosmic rays (c.r.) and magnetic fields in the Galaxy. The variables in this problem are many:large-scale (~ 1 kpc) and small-scale (~10 pc) distributions of c.r. nuclei, of c.r. electrons, of atomic and molecular hydrogen, of magnetic fields, fraction of the observed radiation due to localized sources, etc. Of these, only the distribution - or at least the column densities - of atomic hydrogen are determined in a reliable way. Estimates of the amount of molecular hydrogen can be derived from CO observations or from galaxy counts. The radio and gamma-ray data are not sufficient to disentangle all the other variables in a unique fashion, unless a number of assumptions are made (e.g. Paul et al. 1976). Still, the COS-B team has been able to show that :a) there is a correlation between the gamma-ray emission from local regions, as observed at intermediate latitudes, and the total column density of dust, as measured by galaxy counts. The simplest interpretation is that the density of c.r. nuclei and electrons is uniform within 500 pc of the sun, and that dust and gas are well mixed. Then, γ rays can be used as excellent tracers of local gas complexes (Lebrun et al. 1982, Strong et al. 1982).b) In the same way, the simplest interpretation of the γ-ray emission at energy > 300 MeV from the inner Galaxy, is that c.r. nuclei and electrons are distributed uniformly as well : there is no need for an enhanced density of c.r. in the 3–6 kpc ring; on the contrary, even assuming a uniform density of c.r., the γ-ray data are in conflict with the highest estimates of molecular hydrogen in the radio-astronomy literature (Mayer-Hasselwander et al. 1982).c) In the outer Galaxy, the gradient of c.r. which had become apparent in the early SAS-2 data can now, with COS-B data, be studied in three energy ranges. A gradient in the c.r. distribution is only required to explain the low-energy radiation, which is dominated by bremsstrahlung from relativistic electrons (Bloemen et al., in preparation).

scholarly journals Astronomical observatory of Taras Shevchenko National University of Kyiv in 2020

2020 ◽  
pp. 34-37
Author(s):  
V. Efimenko
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Astronomical Observatory ◽  
Full Time ◽  
Large Array ◽  
Research Projects ◽  
National University ◽  
Satellites Of Jupiter ◽  
Part Time ◽  
Scientific Results

In 2020, the Astronomical Observatory had 58 employees, of which 48 full-time and 10 part-time, scientists – 34 (6 doctors of sciences and 17 candidates of sciences). During the year, 4 budget and 3 contractual topics were implemented. The main scientific results. It is shown that the observed gamma radiation of the TeV range around the SGR 1900 + 14 magnetar – a neutron star with a superpowerful magnetic field – can be generated by two related sources: the undiscovered Hypernova residue, which generated SGR 1900 + 14 and / or the magnetar-wind nebula generated by this magnetar. As part of the implementation of joint international research projects, observations were made at the 6th BTA (SAO RAS), the 2nd HST (India), the 2.6th ZTSh (KrAO), the 2nd (Terskol), the 1.3th (Slovakia) and others telescopes, which resulted in a large array of photometric, polarimetric and spectral data of 9 comets, 6 asteroids, 8 satellites of Jupiter and Saturn and 1 centaur. According to the research results, 2 monographs, 76 scientific articles were published, 72 reports were made at scientific conferences.

scholarly journals Current Jam

2000 ◽  
Vol 122 (05) ◽  
pp. 64-67 ◽  
Author(s):  
Paul Sharke
Keyword(s):  
Electrical Discharge ◽  
Induction Motors ◽  
Electrical Discharge Machining ◽  
High Energy ◽  
Variable Frequency ◽  
Stator Winding ◽  
Full Time ◽  
Insulated Gate Bipolar Transistor ◽  
Variable Frequency Drives ◽  
Part Time

This article focuses on the latest technology, called the insulated gate bipolar transistor that has increased switching frequencies almost twentyfold from the last few years. It turns out that the newer variable-frequency drives, while working full-time shifts as speed controllers of ac induction motors, may be moonlighting with a little part-time electrical discharge machining (EDM). The new drives are suspected of setting up bearing currents. These currents, acting in a fashion identical to the mechanism of EDM—the manufacturing technique by which metal is removed from a workpiece through the use of high-energy sparks—have been eroding the material from the races of motor bearings. In some cases, stray currents are destroying bearings a few months after startup. ABB recently patented a motor winding designed to eliminate circulating bearing currents. The design divides the stator winding into an even number of equal parts per phase. The groups are then distributed uniformly between ac supply connections at both ends of the stator.

Alerting observations of asteroids at the SBG telescope of the Kourovka Astronomical Observatory in the Gaia-FUN-SSO Network

2017 ◽  
Vol 12 (S330) ◽  
pp. 403-404
Author(s):  
Eduard Kuznetsov ◽  
Dmitry Glamazda ◽  
Galina Kaiser ◽  
Yulia Wiebe
Keyword(s):  
Solar System ◽  
Astronomical Observatory ◽  
Small Bodies ◽  
First Results

AbstractRegular astrometric observations of small bodies of the Solar System are conducted using a SBG telescope of the Kourovka Astronomical Observatory of the Ural Federal University. The first results of participation in Gaia-FUN-SSO network are presented.

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