Linear induction motors are applied in equipments with different requirements set up to the controlled motion parameters. Investigation of motoring and breaking modes remains the relevant problem nowadays. The scientific novelty is based on analysis of non-symmetrical operation modes of linear induction motor at supplying it by a voltage source, developing a generalized model of motoring and breaking dynamic modes and analyzing influence of linear motor windings connection way and control parameters on dynamic breaking characteristics. The coordinate transformations of linear induction motors dynamic models, based on rotational motor with assumptions valid for low speed motor and multi-pole motor, are considered. Mathematical and computer models to investigate symmetrical dynamic modes of linear induction drives are presented. Generalized model to investigate non-symmetrical dynamics modes is elaborated. The results of simulation are presented by dependences on the main variables in the time domain, and dependences on both constructional and control parameters that give possibility to optimize constructional parameters of motors.

Linear induction motors are applied in equipments with different requirements set up to the controlled motion parameters. Investigation of motoring and breaking modes remains the relevant problem nowadays. The scientific novelty is based on analysis of non-symmetrical operation modes of linear induction motor at supplying it by a voltage source, developing a generalized model of motoring and breaking dynamic modes and analyzing influence of linear motor windings connection way and control parameters on dynamic breaking characteristics. The coordinate transformations of linear induction motors dynamic models, based on rotational motor with assumptions valid for low speed motor and multi-pole motor, are considered. Mathematical and computer models to investigate symmetrical dynamic modes of linear induction drives are presented. Generalized model to investigate non-symmetrical dynamics modes is elaborated. The results of simulation are presented by dependences on the main variables in the time domain, and dependences on both constructional and control parameters that give possibility to optimize constructional parameters of motors.

Darbas skirtas skylių gręžimo stiklo tekstolito plokštėse kokybės užtikrinimo problemoms spręsti. Teoriškai išanalizuoti įvairūs gręžimo būdai: mechaninis, lazerinis,  plazminis. Išdėstyti pagrindiniai faktoriai, lemiantys skylių kokybinius parametrus.Eksperimentinis tyrimas buvo atliekamas Tauragėje AB „Telga“, gręžimo ceche. Programinėmis gręžimo staklėmis TIMAX MDR 2002 gręžtas stiklo tekstolitas FR–4, skirtingais pjovimo režimais. Mikroskopu įvertinta įvairiais režimais ir grąžtais gautų paviršių kokybė. Išaiškinti optimalūs darbo režimai priklausomai  nuo skylių kokybės keliamų reikalavimų. / This work deals with the quality problems of hole drilling in the glass textolite panels. Different drilling methods: mechanical, laser based and plasmic drilling have been analysed theoretically. The main factors, determining qualitative parameters of holes, have been stated. Experimental study has been performed in Tauragė, AB „Telga“ drilling workshop. Glass textolite FR–4 has been drilled using programmable drilling machine TIMAX MDR 2002 and applying different cutting modes. The quality of surfaces obtained after drilling by different modes and drills has been evaluated by using microscope. Optimal performance modes depending on the requirements for the quality of holes have been explored. The work consists of four parts: introduction, literature review, experimental analysis and conclusions.

Magistro baigiamajame darbe išskirti pagrindiniai fiksuoto valiutos kurso privalumai ir trūkumai, nustatyta jų įtaka Lietuvos ekonomikai bei įvertinta ar Lietuvai yra naudinga bendra valiuta su euro zonos šalimis. Pirmoje darbo dalyje išskiriami pagrindinių valiutos kurso režimų privalumai ir trūkumai, apžvelgiama Lietuvos pinigų politikos raida ir optimalios valiutos zonos teorija. Antroje dalyje remiantis pirmoje dalyje išskirtais fiksuoto valiutos kurso privalumais ir trūkumais analizuojama kaip jie veikė infliaciją, investicijas, užsienio prekybą, einamosios sąskaitos balansą, ar nebuvo grėsmės devalvacijai, ar ECB vykdoma pinigų politika buvo palanki. Trečioje darbo dalyje remiantis optimalios valiutos zonos kriterijais analizuojama ar Lietuva yra OVZ su EU (17) ir ar bendra valiuta – euras būtų naudingas. / In the Master‘s thesis main advantages and disadvantages of Fixed Exchange Rate were distinguished, analyzed their impact on Lithuania‘s economy and evaluated whether a common currency with the euro-zone countries would be useful. In the first part of the paper the main Exchange Rate Regime advantages and disadvantages were identified, main developments of Lithuania’s monetary policy and optimum currency area were overviewed. The impact of fixed exchange rate advantages and disadvantages on indicators such as inflation, foreign direct investment, foreign trade, current account balance were analyzed in the second part of the paper including the analyses of litas devaluation possibility and ECB monetary policy. The third part of the paper aims at assessing whether Lithuania and EU (17) is an OCA and whether a common currency – euro is beneficial.

Šiame magistro darbe nagrinėjama ES įgyvendinamos Europos kaimynystės politikos rezultatai Moldovoje ir Ukrainoje. ES įtaka ir poveikis vertinamas, remiantis europeizacijos teorijos konstruojamais mechanizmais. Išvados apie ES įtaką ir poveikį Moldovos ir Ukrainos viešajai politikai daromos, pasitelkiant nuodugnią trijų atvejų studiją: ES reikalavimų, prieš įvedant naujus prekybos režimus, įgyvendinimas, susitarimai dėl supaprastinto vizų režimo ir readmisijos bei ES vadovaujama Moldovos-Ukrainos sienos monitoringo misija. Magistriniame darbe europeizacijos teorija pritaikoma ES santykių su trečiosiomis šalimis analizei, pateikiama ES kompetencijų raida su prekybos režimu, sienų apsauga ir migracija susijusiais klausimais bei viso to pasekmės Europos kaimynystės politikos įgyvendimui. Galiausiai, pagal konkrečių viešosios politikos sričių reformų įgyvendinimo eigą Moldovoje ir Ukrainoje vertinamos ES galimybės turėti įtakos ar daryti poveikį Europos kaimynystės politikos programoje dalyvaujančioms valstybėms. / Three cases where EU has different competences and which are the most developed in EU relations with Moldova and Ukraine are analysed here. They include current trade regimes with EU (Autonomous trade preferences in case of Moldova and negotiations on free trade area in case of Ukraine), European Union Border Assistance mission to Moldova and Ukraine (EUBAM) and visa facilitation and readmission agreements. Master’s work argues that deeper cooperation between EU and ENP countries began only after these policies were more harmonized inside the EU and show how EU transfered it‘s experience in these fields to Moldova and Ukraine. The independent variable is EU policy harmonization level while the dependent variable is the transfer of EU recommendations and their implementation in Moldova and Ukraine. The hypothesis is that at the macro level degree of transferring EU recommendations to Moldova and Ukraine depends on concrete policies harmonization level inside the EU. It means that more intense transfer can be expected in policies where EU has exceptional competence and results might be not so good where decision is made by EU member states governments. To conclude, widened understanding of europeanisation theory allows usage of this theory in EU relations with non members. However, it is important to have in mind that the horizontal mechanism used by the EU is not of the same degree of integration in the case of ENP and to EU member states. Such position creates the situation... [to full text]

It was investigated the colour reproduction on prints made in ink-jet printer. Experimentally investigated gradation characteristics of CMYK colours. It was made a 26 step strip with raster dots from 0 to 100 %. Prints were made at different printing regimes on papers with different whiteness. Zone optical densities were measured, compared with theoretical density values and gradational distortions were determined. Also were measured 100% raster strips in CIE L*a*b* coordinate system and defined the maximum reproduction of colours in ink-jet printer.

Šiame darbe analizuojamos XXI a. I deš. posovietines „spalvotąsias revoliucijas“ nulėmusios priežastys, siekiant apibrėžti posovietinių politinių sistemų atsivėrimo pokyčiams galimybes. Nagrinėjami trys valstybių atvejai – Gruzija, Ukraina ir Baltarusija, iš kurių du pirmieji – sėkmingų „spalvotųjų revoliucijų“ pavyzdžiai įvykusio dalinio valdžios elito pokyčio prasme, tuo tarpu Baltarusijoje bandymai inicijuoti „spalvotuosius“ pokyčius nepavyko. Tiriama pokytinius procesus NVS erdvėje paremianti užsienio įtaka bei vidaus veiksniai, vertinant posovietinės visuomenės ir valdžios elito būklę „spalvotųjų revoliucijų“ kontekste. Siekiama nustatyti, kurie iš tiriamų veiksnių - posovietinių šalių ryšiai su Vakarais, nepasitenkinimas ir įtampos socialiniame lygmenyje ar posovietinio režimo nulemtos sąlygos - turėjo didžiausios įtakos revoliucinės situacijos susidarymui. Atitinkamai bandoma nustatyti, kodėl kai kuriais posovietinių šalių atvejais mėginimai pakeisti valdžios elitą buvo nesėkmingi. / This analysis is aimed to provide a more comprehensive approach towards this century’s “coloured revolutions”, which have taken place in Georgia (2003), Ukraine (2004) and than moved to other post soviet countries. Obviously, this conspicuous and epidemic phenomenon proved an existing political viability in the slow-moving transitional countries. But still, it is not clear if this post soviet styled political instability reflects anything more than a tremor without long lasting democratic effects to future political and social developments of CIS countries. The author observes an existing academic confusion while trying to define “colour” events and evaluate the prospects of such kind of “democratic breakthrough” in CIS. Therefore, avoiding any miscalculations in this analysis, “coloured revolutions” are defined as revolution situations without revolution outcomes. That means, the success of “colour” events is limited to the cases where partial change of ruling elite has taken place. “Post colour” political developments are not taken into the account. The author selects three different cases – Georgia and Ukraine (two examples of successful “colour” change) and Belarus (the case of failed “revolution”). The main aim of these cases’ analysis is to define and examine factors which cause high-degree of political instability and partial political changes in elite level and try to explain why the same kind of revolution situation does not evolve in other countries of the region... [to full text]