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Orenburg State University january 23, 2022   RU/EN
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Turbina I.N., Mantrova M.V., Kravchenko I.V.
TOWARDS THE QUESTION OF THE INTRODUCTION OF LEATHER BERGENIA IN CONDITIONS OF KHANTY-MANSI AUTONOMOUS AREA — UGRA [№ 10 ' 2015]
The article is devoted to the analysis of some aspects of leather bergenia introduction in conditions of Surgut, namely, it considers the dynamics of photosynthetic pigments of chloroplast and heavy metals content in green leaves of bergenia at different stages of seasonal development. The content of green pigments in leaves varied during the vegetative period in the range from 0.58 to 0.69 mg/g with an accumulation maximum in summer months. Throughout the vegetative period gradual strengthening of the share of chlorophyll "a" was noticed, its level exceeded the level of chlorophyll "b" 1.5–3.0 times. The content of yellow plastid pigments throughout the entire period of research was considerably inferior to the level of chlorophyll. So, the maximum value of the share of carotinoids was 0.39 mg/g during vegetation. The assimilating bodies of bergenia participate in accumulation of chlorophyll, carotinoids, and low concentration of chemical elements indicates their main accumulation in fabrics of the root system. Thus, the content of photosynthetic pigments in green leaves of bergenia throughout the entire period of supervision varied with an accumulation maximum during vegetation. Low concentrations of the analyzed heavy metals at different stages of seasonal development are in green leaves of bergenia at the level, characteristic for uncontaminated places of growth. Specific features and differentiation of bodies of a plant to accumulation of these elements are also noted.

Savkova T.N., Кravchanko A.I., Kuharenko S.N., Lukashov V.M., Svintitskij A.V.
THE DETERMINATION OF ENERGY AND OPTICAL CHARACTERISTICS OF THE MODEL OF LIGHTING DEVICE UNDER PULSE EXCITATION IN A MATHCAD SOFTWARE ENVIRONMENT [№ 9 ' 2015]
LED devices with a pulse mode are increasingly used in lighting technology — strobe lights, projectors, lights, security systems, sensors, pulse devices, etc. Pulsed power supply lets you reduce heat in the p-n junction of the LED, it improves efficiency and service life of the lighting device. There is a method to determine energy and optical characteristics of the LED model. Using lighting device under pulse excitation with proposed Mathcad software environmentallows to determine the current power consumption value of the model, the radiation power and energy efficiency. Measurements of energy and the optical parameters of the lighting device model manufactured by cold-white powerful LED ARPL-3W were made. It was shown that the maximum values of efficiency under pulsed excitation and continuous power for the model is amounted to about 40 %. The efficiency difference in power consumption (nominal mode) with continuous and pulsed excitation power with 50% duty cycle is about 5 %. In a range of wattages to 0,02 W efficiency lighting device model is practically independent of the crystal's active region temperature. The form of pulse supply affects energy efficiency of the LED depending model of lighting device. Exciting trapezoidal shapes of cold white LED triangular pulses makes efficiency lower than exciting those with rectangular shaped pulse. Studied power characteristics have shown a significant effect for the duration of the pump pulse currents exceed 2A efficiency of emitting recombination. Increasing the frequency of the supply current reduces the efficiency of the crystal under the same duration and power of the exciting pulse.

Turbina I.N., Gorban M.V., Kravchenko I.V, Vdovkin R.S.
COMPARATIVE CHARACTERISTICS OF THE PHOTOSYNTHETIC PIGMENTS CONTENTS OF SOME GREENHOUSE PLANTS UNDER VARIOUS CONDITIONS OF ILLUMINATION [№ 12 ' 2013]
The article is devoted to the analysis of the influence of intensity of illumination and the qualitative and quantitative structure of photosynthetic pigments (chlorophylls a and b) of some hothouse plants used in interior gardening.

Golikov V.E., Slepyikh N.I., Kravchenko N.F.
РLANNING OF ANESTHETIC AID IN PATIENT CARE INSTITUTIONS OF RURAL AREAS AND SMALL TOWNS [№ 6 ' 2010]
The article presents supposed range of anesthetic aid in patient care institutions of rural areas and small towns based on the landmark approach to evaluation of its need. Research on perfection of anesthetic aid was carried out for the last 10 years.


[№ 12 (app.1) ' 2006]

E.A. Kravchenko
THE LANGUAGE OF COLOUR IN THE SPACE [№ 1 ' 2001]
The problems of colour and colour space are considered in this article. The problem of colour has a particular importance while using the colour design in the public communication, the everyday life, the surrounding world. The necessary understanding of tail awgnage of thes pace and the colour, a skill to read and use it for expressing your ideas. These problems are touched upon at the chair of architecture and design of the Orenburg State University.

N.I.Zhezhera, V.V. Kravchenko
MATHEMATICAL DESCRIPTION OF STEAM ELECTRIC STATIONS AND BOILER ROOM UNITS REDUCING INSTALLATIONS AT SUBCRITICAL ATMOSPHERIC STEAM [№ 2 ' 2000]
This article represents differential equation of atmospheric steam reducing installations of steam electric stations and boil room units where steam speeds through adjusting valves are subcritical. The reducing installations are considered as automation objects of numeral control systems synthesis. The differential equation transformation into operative and dimensionless form and its linearization are made. Using typical dynamic units of automatic control theory, the reducing installations structural scheme is done.


Editor-in-chief
Sergey Aleksandrovich
MIROSHNIKOV

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© Электронное периодическое издание: ВЕСТНИК ОГУ on-line (VESTNIK OSU on-line), ISSN on-line 1814-6465
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