Macrokinetic Model of Catalase Electrode with Biphasic Enzyme Inhibition

Macrokinetics of catalase based enzyme electrode was investigated in presence of enzyme inhibitor – hydroxylamine. The modeling of the electrode was performed using biphasic scheme of enzyme inhibition and external diffusion limitation. The maximal enzyme electrode sensitivity was indicated at transition from diffusion to kinetically controlled mode. The fitting of experimental data demonstrated that the enzyme electrode had 70% of maximal sensitivit

Peripheralisation trends in rural territories: the case of Lithuania

This article describes the main trends in the changes to the system of rural settlements in Lithuania and determines the regional peculiarities of these changes. The analysis was carried out using data collected during the censuses of 2001 and 2011, and information that was gathered during field trips to rural settlements across the country in 2013 and 2014. Our analysis showed that the population decreased in the majority of settlements independently of their size. However, distinct regional differences can be identified and these were especially evident when comparing the data collected from the rural settlements located close to the capital city (Vilnius) or regional centres (Kaunas, Klaipėda, Šiauliai, Panevėžys and Alytus) with the data collected from the peripheral areas located further from cities or roads of regional importance. The survey showed that the north-eastern and southern parts of Lithuania are depopulated most, whereas in the western part of the country the number of residents was stable until 2000, and only in the 21st century did it start to decrease due to the increasing emigration rates. Also, the analysis of the structure of settlements allowed us to point out the historical circumstances as the cause of regional differences. In the north-eastern part of Lithuania the settlements are smaller than in the western part of Lithuania. The analysis shows that the increasing importance of the centre-periphery factor will further determine the decline of rural settlements in peripheral territories in Lithuania

The Impact of Covid-19 on the Tourism and Accommodation Sector in Lithuanian Rural Areas

This article aims (1) to underline the level of impact of COVID-19 on the accommodation sector in Lithuanian rural areas, (2) to evaluate transformation possibilities and new opportunities for rural tourism, and (3) to present a new model of the tourism future in the regions. The article discusses the historical aspects of the accommodation business in Lithuania, the territorial distribution of accommodation in rural areas of Lithuania, and the impact of the COVID-19 pandemic on the accommodation sector in rural areas. Spatial analysis, together with qualitative and quantitative methods, was used in this research. The primary data for the article were received from the questionnaires filled out by fifty representatives of the Tourism Information Centres from different Lithuanian regions. Also, the analysis is supplemented by the secondary official statistical data. The research results revealed the direct impact of COVID-19 on the accommodation sector in rural regions of Lithuania. The proposed RegTour model contributes to reducing the impact of COVID-19 on the country\u27s economy and promoting the development of new forms of knowledge-based business and the transformation of the sector. Moreover, the research revealed the unexploited opportunities of rural tourism and the possible directions of change

Challenges of the tourism sector in Lithuania in the context of the COVID-19 pandemic: State aid instruments and the efficiency of the tourism business support

At the beginning of 2020 Lithuania, and many other European countries, introduced quarantine and began restricting movement across the country’s borders. The imposed restrictive measures have greatly impacted and led to the stagnation of tourism sector. Due to the COVID-19 pandemic and travel restrictions, the number of international tourist arrivals sharply decreased. In 2021 the majority of restrictions have been eased due to the decreasing morbidity, but it did not reinstate the tourism into the previous level. According to statistics, the decline in tourist flows in Lithuania in 2021 still continued, albeit the decrease was smaller. The increase in the number of local tourists (especially in 2021) has somewhat compensated the loss of international tourism, but has not changed it. The tourism business is still going through a difficult period. This article emphasizes the issues of local and inbound tourism business in Lithuania in the context of Covid-19 pandemic. The greatest attention is placed on the instruments proposed by the Lithuanian Government to mitigate the negative consequences of the pandemic on tourism service. The research combines secondary and primary data sources. Secondary data was used for the analysis of official Lithuanian statistics in order to introduce general trends of the development of tourism sector during the last decade. Primary data was received using the methods of focus group and survey (a questionnaire to collect data sets from tourism business enterprises in Lithuania). The statistical analysis revealed that the difficult situation was noticed in all fields of tourism sector, however, the main losers of the pandemic were those relying on the international tourist. The analysis of official documents disclosed, that even though the tourism business was able to benefit from the variety of offered governmental aid packages in 2020–2021, the quantity and quality of support was not enough and strongly criticized. Our survey results pointed out the instruments that were most effective among the tourism enterprises. Moreover, from the collected answers we noticed, that at least part of tourism enterprises took the opportunity to use the support not only for compensation of pandemic related costs but also to look forward and the received financial support invested in innovative solutions in the tourism business, so pandemic potentially had some positive effects as well. Also, the survey results reviled that there are considerable opportunities for tourism related development of the nature rich, non-metropolitan regions, though at the moment these activities quite often remain outside the market relations and do not produce new incomes and jobs

The optimization of spring rape crop with biological fertilizes "Raskila"

Magistrantūros studijų baigiamajame darbe pateikiami biologinių trąšų „Raskila“ panaudojimo vasarinių rapsų lauko eksperimente rezultatai. Eksperimento vietoje dirvožemis – giliai glėjiškas karbonatingas išplautžemis, pagal granuliometrinę sudėtį lengvas priemolis (Bathihypogleyi-Calc(ar)ic Luvisol). Lauko eksperimentas atliktas pagal schemą: 1) kontrolė (F) – foninis tręšimas NPK; 2) F + Raskila 2 l ha-1 purkšta 1 kartą; 3) F + Raskila 2 l ha-1 purkšta 2 kartus; 4) F + Raskila 2 l ha-1 purkšta 3 kartus; 5) F + Raskila 3 l ha-1 purkšta 1 kartą; 6) F + Raskila 3 l ha-1 purkšta 2 kartus; 7) F + Raskila 3 l ha-1 purkšta 3 kartus. Pirmą kartą rapsai purkšti lapų vystimosi tarpsnyje 13-14 BBCH; antrą kartą – stiebo augimo tarpsnyje 33-34 BBCH; trečią kartą – butonizacijos tarpsnyje 52-53 BBCH. Darbo objektas: vasarinių rapsų pasėliai, papildomai tręšti biologinėmis trąšomis „Raskila“. Darbo metodai: Tirtomis biologinėmis trąšomis vasarinių rapsų laukeliai pagal schemą apipurkšti nugariniu purkštuvu. Rapsų sėklų kokybiniai rodikliai nustatyti: žalieji riebalai – Soksleto, žalieji proteinai – Kjeldalio, žalioji ląsteliena – Genebergo – Štomano, žalieji pelenai – sudeginant mufelyje. Rezultatai: Tyrimo metu nustatyta, kad patikimai didžiausias vasarinių rapsų sėklų derlius gautas augalus apipurškus biologinių trąšų „Raskila” (3 l ha-1) tirpalu tris kartus. Gautas 3,63 t ha-1 sėklų derlius, t. y. 27,37 proc. patikimai didesnis, lyginant su kontroliniu variantu, kur biologinės trąšos nenaudotos. Biologinių trąšų „Raskila“ naudojimas 3 l ha-1 norma 2 ir 3 kartus turėjo esminės įtakos rapsų sėklų kokybiniams rodikliams: žaliųjų proteinų nustatyta atitinkamai – 0,30 ir 0,34 proc., žaliųjų riebalų 1,38 ir 1,42 proc., žaliosios ląstelienos 2,82 ir 3,05 proc. ir sausųjų medžiagų 1,25 ir 1,32 proc. patikimai daugiau, lyginant su kontrole, kur biologinės trąšos nebuvo naudotos. Gliukozinolatų kiekius vasarinių rapsų sėklose patikimai (1,27–2,63 μmol g-1) mažino ir 2 l ha-1, ir 3 l ha-1 biologinių trąšų „Raskila“ normos, nepriklausomai nuo purškimo kartų. Nustatyta, kad išleidus 1 eurą vasarinių rapsų derliaus priedui užauginti ir realizuoti, gautas pelnas svyravo nuo 4,75 iki 6,58 eurų – daugiausiai papildomo bendrojo pelno gauta patręšus „Raskila“ 3 l ha-1 vieną kartą.The master work presents the results of spring rape yield and quality research in plots fertilized with different norms biological fertilizers ‘Raskila’. Object of the work – spring rape fertilized with biological fertilizers ‘Raskila’. Method of the work: Rapeseed qualitative indicators was evaluated by the following methods: the green fat – Soxhlet, the crude protein – Kjeldahl, the crude fiber – Geneberg-Stoman, the green ash – burning muffle furnace. Field experiments were conducted on a Bathihypogleyi-Calc(ar)ic Luvisol at the Experimental Station of the Aleksandras Stulginskis University in 2014. Treatment of investigations: 1) Contol (F) – background NPK fertilization; 2) F + Raskila 2 l ha-1 sprayed 1 time; 3) F + Raskila 2 l ha-1 sprayed 2 times; 4) F + Raskila 2 l ha-1 sprayed 3 times; 5) F + Raskila 3 l ha-1 sprayed 1 time; 6) F + Raskila 3 l ha-1 sprayed 2 times; 7) F + Raskila 3 l ha-1 sprayed 3 times. The reliably largest spring rapeseed yield has been obtained when the plants sprayed with biological fertilizers Raskila (3 l ha-1) three times. In this fertilization variant has been obtained 3.63 t ha-1 rapeseed yield – 27.37 per cent. significantly higher compared with the control treatment. The results of work. Fertilization of rape crop, in comparison with crop without fertilization, increased the percentage of crude fats, crude proteins, crude fiber and dry matter. The biological fertilizers Raskila (3 l ha-1 norm – sprayed 2 and 3 times) had a material impact on rapeseed qualitative indicators: crude proteins established – 0.30 and 0.34 per cent., crude fats – respectively 1.38 and 1.42 per cent., crude fiber – respectively 2.82 and 3.05 per cent., dry matter – 1.25 and 1.32 per cent more than control. The biological fertilizers Raskila significantly decreased the amount of glucosinolates in rapeseed. The release of a 1 euro for spring rape fertilization received a profit 4,75 to 6,58 euro. The highest supplementary gross profit received from rape fertilization once with „Raskila“ 3 liters per hektare.Žemės ūkio akademijaVytauto Didžiojo universiteta

Investigation of Frequency Controlled Sensorless Induction Motor Drives

Disertacijoje nagrinėjami bejutiklių asinchroninių dažninių elektros pavarų dinamiai modeliai ir pereinamieji vyksmai. Disertaciją sudaro įvadas, trys pagrindiniai skyriai, išvados, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašas. Įvadiniame skyriuje formuluojama tiriamoji problema, darbo aktualumas, tyrimų objektas, darbo tikslas ir uždaviniai, tyrimų metodika, darbo mokslinis naujumas, rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomos autoriaus paskelbtos publikacijos disertacijos tema ir pranešimai konferencijose bei disertacijos struktūra. Pirmajame skyriuje pateikta dažninių elektros pavarų matematinių modelių analizinė literatūros apžvalga. Išanalizuotos asinchroninio variklio koordinačių sistemos ir jų transformavimas. Apžvelgta: variklio valdymo metodai, bejutiklių pavarų kūrimo ir taikymo aktualumas, aprašytas neraiškiosios logikos reguliatoriaus valdymo principas. Apibendrinta realiuoju laiku valdomų elektromechaninių pavarų kūrimo problematika. Formuluojamos skyriaus išvados ir disertacijos uždaviniai. Antrajame skyriuje aprašoma bejutiklių asinchroninių pavarų kompiuterinių modelių sudarymui naudojama metodika ir priemonės. Sudaromas greičio stebiklio matematinis ir kompiuterinis modeliai. Aprašoma neraiškiosios logikos reguliatoriaus sintezė ir elektromechaninės sistemos valdymo realiuoju laiku priemonės. Skyriaus pabaigoje formuluojamos išvados. Trečiajame skyriuje pristatomi imitaciniai ir eksperimentiniai tyrimai. Sudaromi bejutiklių elektros pavarų kompiuteriniai modeliai pavaros pereinamiesiems vyksmams tirti. Ištirta netiesinė, su greičio grįžtamuoju ryšiu sistema, kurios valdymui pritaikytas kombinuotas neraiškiosios logikos ir proporcinis integralinis diferencialinis (PID) reguliatorius, kuris veikia visame darbinių greičių diapazone. Bandymai atliekami esant skirtingiems greičio reguliatoriams, skirtingoms apkrovoms bei keičiant greičio nuostato signalą. Atlikta sudarytų dinaminių modelių adekvatumo patikra realiuoju laiku valdomu eksperimentiniu dažninių pavarų stendu. Disertacijos tema paskelbta dešimt mokslinių straipsnių: keturi – periodiniuose recenzuojamuose mokslo leidiniuose; trys – mokslo žurnaluose, įtrauktuose į Thomson Reuters Web of Science duomenų bazę; vienas – Lietuvos mokslo žurnaluose; šeši – kituose tarptautinių ir respublikinių konferencijų leidiniuose. Disertacijos tema perskaityti devyni pranešimai Lietuvos ir tarptautinėse konferencijose

Ateitininkų federacijos išeivijoje "dienoraštis" : recenzija

Reikšminiai žodžiai: Ateitininkai; Ateitininkų federacija; Istorija; Išeivijos istorija; Organizacijos; Ateitininkai; History; Migrants history; Organizatio

Creating development supporting context following an example of coworking

Baigiamojo darbo tikslas yra pateikti vystymąsi palaikančio konteksto organizacijose formavimo sprendimus remiantis coworking'o fenomenu bei pokyčiais vykstančiais ekonominėje sistemoje. Teorinėje darbo dalyje analizuojami pokyčiai ekonominėje sistemoje, organizacijose, bei individualiame lygmenyje, lėmę naujo fenomeno – coworking‘o – atsiradimą. Gilinamasi į individo vystymosi šių pokyčių akivaizdoje problematiką. Analitinėje baigiamojo darbo dalyje buvo pasitelktas K.Lewin jėgų lauko analizės modelis, leidęs coworking‘o centre užčiuopti jėgas skatinančias ir varžančias individų bendradarbiavimą – vystymosi katalizatorių. Projektinėje darbo dalyje pateikiami samprotavimai apie neišnaudotą individų potencialą, kuris yra suvaržytas išorinių reguliavimų. Išorinių reguliavimų mažinimas įvardijamas kaip vystymo suponavimo šaltinis ir siūlomas laikyti siekiamybe sociokultūrinėse sistemose.The main aim of this master thesis is to give ground to coworking phenomenon as a suitable place for individual development and to give advice to organizations that are keen to correspond to today’s tendencies. The work consists of three parts: The theoretical part deals with topic of ongoing changes in economic system as well in organizations and in individual level, in order to gain understanding what has caused the appearing of the new phenomenon - coworking. Furthermore, author is reasoning about individual development issues in a presence of changes. The analytical part of the final work puts in practice K.Lewins’ forcefield analysis tool in order to obtain driving and restraining forces influencing cooperation level at the coworking center. In the designed part of work author is reasoning about unused individual potential, which is limited by extrinsic regulations. Reduction of the extrinsic regulations is regarded to be source of individual development.Vytauto Didžiojo universiteta