Ekologiškų vaisių ir uogų elektrocheminiai tyrimai

Vytauto Didžiojo universitetasŽemės ūkio akademij

Elektromagnetinė apšvita darbe ir miokardo infarkto rizika

Vytauto Didžiojo universitetasŽemės ūkio akademij

Electromagnetic fields in computerized working places their impact to human health and prevention

Tyrimų tikslas – išmatuoti ir įvertinti elektromagnetinės spinduliuotės stiprį kompiuterizuotose darbo vietose ir aptarti prevencijos priemones. Elektromagnetinių laukų parametrai buvo matuoti Vytauto Didžiojo universiteto Gamtos mokslų fakulteto Aplinkotyros katedros dėstytojų darbo vietose ir kompiuterių klasėje. Kompiuterizuotose darbo vietose elektrinio lauko stipris 5 Hz – 2 kHz dažnių ruože svyravo nuo 3,1 iki 9,5 V/m. Magnetinio srauto tankis svyravo nuo 38 iki 110 nT. Magnetinio srauto tankis 2 – 400 kHz dažnių ruože kito nuo 13 iki 23 nT, o elektrinio lauko stipris nuo 0,2 iki 0,5 V/m. Kompiuterizuotose darbo vietose elektrinio lauko stipris ir magnetinio lauko tankis 5 Hz – 2 kHz ir 2 – 400 kHz dažnių ruožuose neviršijo Lietuvos techninėje normoje TN 01:1998 nustatytų verčiųThe aim of the study was to measure electromagnetic fields in computerized working places and to discuss prevention implements. Parameters of electromagnetic fields were measured in lecturers working places and computer class in Vytautas Magus University, Faculty of Natural Sciences, Department of Environmental sciences. Electric field strength in computerized working places than frequency was 5 Hz – 2 kHz varied from 3,1 to 9,5 V/m. Magnetic flux density varied from 38 to 110 nT. Magnetic flux density than frequency was 2 – 400 kHz varied from 13 till 23 nT and electric field strength from 0,2 till 0,5 V/m. Measured electric field strength and magnetic flux density in computerized working places than frequency was 5 Hz – 2 kHz and 2 – 400 kHz was less than norms set in the Lithuanian technical norm TN 01:1998Vytauto Didžiojo universiteta

Occupation exposure to electromagnetic fields and risk of myocardial infarction

Vytauto Didžiojo universitetasŽemės ūkio akademij

On the availability of information and methods for modeling of forest biomass at regional level in Lithuania

Forest resource information system of Lithuania, which includes both geo-referenced and statistical data and its usability for modeling forest biomass resources within the frames of INTERREG IIIB project "Baltic Biomass Network" is discussed in this paper. The main focus is given on the use of GIS in the Lithuanian forest inventory, management and planning system, biological evaluation of the forests, their diversity, etc. Available and being constructed forestry GIS databases of different content and accuracy, thematic mapping technologies as well as some GIS related projects in the country are discussed. The second part of this paper deals with the methods, proposed to use for the estimation biomass potential for energetic needs available in Lithuanian forest. Two approaches are used to get the figures from data of conventional forest inventories - (i) total above- and below-ground biomass and biomass of dead wood, according to the FAO Global forest resource assessment and (ii) potentially available for fuel forest biomass as small diameter trees from thinning cuttings, felling residuals and stumps from final felling, derived using conventional cutting budget calculation methods. The total forest biomass in Lithuania amounts 150 Mil. tones, as the biomass from small diameter trees - 89 th. tones, the biomass from felling residuals - 760 th. tones and the stumps, potentially available from final felling - 610 th. tones. These estimates as well as the calculation methods are proposed to be used in the Baltic Biomass Network projectVytauto Didžiojo universitetasŽemės ūkio akademij

Modeling the amount of cutting residues and timber volumes suitable for fuel

This paper briefly introduces the approaches used within the 1NTERREG IIIB Project Baltic Biomass Network to model forest biomass fuel resources in Lithuania and Kaunas county. Using the available statistical and geographic data sets and a variety of methods to incorporate the above information into bio-energy related models, general statistics of biofuel resources potential are provided. Two approaches are used to get the figures from data of conventional forest inventories - (i) total above- and below-ground biomass and biomass of dead wood, according to the FAO Global forest resource assessment and (ii) potentially available for fuel forest biomass as small diameter trees from thinning cuttings, felling residuals and stumps from final felling, derived using conventional cutting budget calculation methods. The total forest biomass in Lithuania exceeds 200 Mt, as the biomass from small diameter trees - 89 kt, the biomass from felling residuals -760 kt and the stumps, potentially available from final felling - 610 kt. These values were convened into energetic values. Mathematical model for estimation the amount of cutting residues and the volumes of timber suitable for fuel on a forest compartment level, developed within the frames of BBN project, is described together with some testing results from Kaunas forest enterpriseVytauto Didžiojo universitetasŽemės ūkio akademij