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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Piktžolių naikinimo infraraudonaisiais spinduliais tyrimai / Weed control infrared analysis

Žalnieriūnaitė, Sandra 09 June 2009 (has links)
Magistro tezių tema – infraraudonųjų spindulių poveikio augalams tyrimai. Darbo apimtis 48 puslapiai, 30 paveikslų, 3 lentelės. Rašant darbą, remtasi 46 literatūros šaltiniais. Tyrimų objektas – laboratorinių bandymų metu, buvo matuojama stiebo šerdies skersmens įkaitimo trmperatūra trijų rūšių piktžolių: trikertės žvaginės (Capsella bursa), žliūgės (Stellaria media) ir paprastosios žilės (Senecio vulgaris). Įkaitimo iki 70 °C temperatūra laikoma pakankama suardyti piktžolių ląstelėms, nes piktžolę veikiant aukšta temperatūra, jų ląstelės staiga įkaista, sukreša baltymai ir sutrūkinėja jų apvalkalai, todėl sutrinka medžiagų apykaita ir augalas žūsta. Šio darbo tikslas – ištirti piktžolių trikertės žvaginės, žliūgės ir paprastosios žilės šiluminį jautrumą naudojant infraraudonųjų spindulių įrenginį ir šio įrenginio efektyvumą. Laboratoriniais tyrimais nustatėme, kad kaitinant infraraudonųjų spindulių įrenginiu piktžolių stiebus greičiausiai iki 70 oC įkaista žliūgė (1,4 mm skersmens per 3s.),o lėčiausiai paprastoji žilė (1,45 mm skersmens per 10,8s ). Kai įrenginys trauktas 0,10 m/s greičiu, buvo sunaikintos visos piktžolės, o kai įrenginys trauktas 0,14 m/s – 75% piktžolių. Piktžolių naikinimo infraraudonaisiais spinduliais efektyvumas išryškėja po kelių dienų. Piktžolės jau neatsigauna, nes jos išdžiūsta. / Summary Subject of investigation – the infrared effects of plant Subject of investigation - the infrared effects of plant research. The text corpus constitutes of 48 pages, including 30 pictures and 3 tables, 46 literature sources are used Research laboratory tests, were measured in the core of the stem diameter of heating trmperatūra three types of weeds: Capsella bursa, Stellar media and the Senecio vulgaris. Warm to 70 ° C is considered sufficient to destroy the cells of weeds, because weeds in the high temperature, the cells suddenly heated, clotting proteins and crazy in their shells, and therefore violated the metabolism and the plant dies. The aim of this work - to examine weed clang, and the simple gray thermal sensitivity using infrared ray device and the device performance. Laboratory studies have found that the infrared heating device is likely to weed stems up to 70 ° C heated Stellar media (1,4 mm in diameter through 3s.), and the simple gray slowest (1,45 mm in diameter through 10,8 s). When the device is included in 0,1 m / s, all the weeds were destroyed, and the device included a 0,14 m / s - 75% of weeds. Weeding infrared efficiency become apparent after a few days. Weed is not already, and because they are killed.
2

Terminis vienaskilčių piktžolių naikinimas vandens garu / Thermal monocotyledonous weed removal using water vapour

Virbickaitė, Rasa 13 June 2005 (has links)
Subject of investigation - thermal extermination of monocotyledonous weed plant (barnyard grass (echinochloa crus-galli (L.))) using hot water vapour. Ecological weed control in crops is very important for development of ecological agriculture economy. While carrying out thermal weed extermination, it was noticed that monocotyledonous weeds are difficult to exterminate (to affect) thermally. The analysis of thermal extermination of the monocotyledonous weed plant (barnyard grass (echinochloa crus-galli (L.))) using wet water vapour is presented in the work. On the basis of temperature spread regularities in barnyard grass tissues established, the main technological indexes of thermal weed extermination using wet water vapour, application of which enables the efficient and ecological control of this difficult to exterminate weed plant, were determined. The data obtained were analysed statistically using the two-factor dispersion analysis. Growth stage efficiency of barnyard grass not dependent on the thermal effect duration, thermal effect duration influence not dependent on growth stages, as well as their interaction was discussed. The aim of this work is investigation of the water vapour thermal impact on the weed plant barnyard grass (echinochloa crus-galli (L.)) in various growth stages, with the purpose of its thermal extermination.

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