26 results on '"A. Dragūnas"'
Search Results
2. Body weight support impacts lateral stability during treadmill walking
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Dragunas, Andrew C. and Gordon, Keith E.
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- 2016
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3. Importance of sagittal kick symmetry for underwater dolphin kick performance
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Atkison, Ryan R., Dickey, James P., Dragunas, Andrew, and Nolte, Volker
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- 2014
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4. ADMINISTRACINIO PASTATO ILGALAIKĖS STEBĖSENOS DUOMENŲ ANALIZĖ IR VALDYMO EFEKTYVUMO ĮVERTINIMAS
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Vydmantas Dragūnas and Violeta Motuzienė
- Abstract
Šiltėjantis pasaulio klimatas ir su tuo susiję padariniai, įpareigoja mažinti pirminės ir galutinės energijos vartojimą. Tiek Lietuvoje, tiek pasaulyje vieną didžiausių energijos taupymo potencialų turi pastatų sektorius. Tarp pastatų energijos suvartojimais išsiskiria administracinės paskirties pastatai. Nors pastatai projektuojami, statomi ir sertifikuojami pagal Europos sąjungos direktyvose nustatytus reikalavimus, tačiau tik dalis pastatų pasiekia sertifikatuose nurodytas vertes. Didesnį energijos vartojimą lemia įvairūs veiksniai, apimantys projektavimo, statybos ir eksploatavimo etapus. Mokslininkai dažnai išskiria pastato inžinerinių sistemų valdymą, kaip vieną iš pagrindinių veiksnių lemiančių pastato energijos suvartojimus. Straipsnyje analizuojamas realus administracinis pastatas ir vertinamas jo valdymo efektyvumas, remiantis ilgalaikės stebėsenos duomenimis. Nors tiriamo pastato faktinis energijos suvartojimas neženkliai viršija pastato energinio naudingumo sertifikate nurodytą poreikį šildymui, tačiau išanalizavus stebėsenos duomenis pastebimas nepanaudotas energijos taupymo potencialas tobulinant šildymo ir vėdinimo sistemų valdymą. Atsižvelgiant į pastato mikroklimato, oro kokybės ir žmonių buvimo patalpose duomenis siūlomi valdymo efektyvumo didinimo sprendimai, kuriuos taikant pastato energijos suvartojimai turėtų sumažėti 20 %
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- 2022
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5. ADMINISTRACINIO PASTATO ILGALAIKĖS STEBĖSENOS DUOMENŲ ANALIZĖ IR VALDYMO EFEKTYVUMO ĮVERTINIMAS
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Dragūnas, Vydmantas, primary and Motuzienė, Violeta, additional
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- 2022
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6. Taxation on economic activities of individuals in the eu countries : analysis of taxation on employment related income
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Dragūnas, Rytis
- Abstract
VILNIUS UNIVERSITY BUSINESS SCHOOL BUSINESS FINANCE STUDY PROGRAM RYTIS DRAGŪNAS, VILIUS MIKĖNAS TAXATION ON ECONOMIC ACTIVITIES OF INDIVIDUALS IN THE EU COUNTRIES: ANALYSIS OF TAXATION ON EMPLOYMENT RELATED INCOME Supervisor - Diana Bachtijeva Work is prepared - in 2021. in Vilnius Thesis consists of 44 pages. Number of tables at work 3 pcs. Number of pictures at work 13 pcs. Number of literature and sources 53 pcs. Brief Job Description: An analysis of the taxation of employment-related income. Adaptation of personal income tax, social contributions and applicable deductions to taxes paid. Evaluation of deduction in relation to the estimated tax burden. Purpose and objectives: Research methods used in the work: documentary, content analysis, comparison and systematic analysis. 1. To examine the importance of the tax system for states and to examine the concept of economic activity. 2. Analyze the similarities and differences between the taxes applicable to persons employed in the EU countries and their amounts. 3. To analyze the payroll tax deduction systems of the EU member states. 4. To assess the impact of tax incentives applied in the EU countries on the amount of taxes paid. Conclusions: The importance of tax systems for the state and the concept of economic activity are examined. EU countries apply social and income taxes to individuals. In order to even out social inequality, various benefits are applied: NPD, tax credits, etc., depending on a person's social, family and financial situation. The impact of tax relief on different household models in the countries was assessed and the differences in the biggest differences in the EU countries were assessed.
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- 2022
7. Hepatitis C infection among primary health care patients: prevalence and risk factors
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Šarūnas Dabravalskis, Limas Kupčinskas, Gediminas Dragūnas, Eglė Čiupkevičienė, and Janina Petkevičienė
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medicine.medical_specialty ,Rapid screening test ,business.industry ,Hepatitis C screening ,Internal medicine ,Public Health, Environmental and Occupational Health ,Primary health care ,Medicine ,Cancer ,Hepatitis C ,business ,medicine.disease - Abstract
Background Many people chronically infected with the hepatitis C virus (HCV) are not aware of their infection. The benefit of screening for HCV is earlier treatment with antiviral medications, which are highly effective and can prevent long-term complications of chronic HCV such as cirrhosis, liver cancer, and death. This study aimed to examine the prevalence of HCV infection and its risk factors among primary health care patients. Methods The study was carried out in the primary health care centre of seaport Klaipeda, Lithuania. Patients were invited to participate in the screening by family doctors, regional media, social networking sites, and leaflets. Screening for HCV involved a blood test for the presence of an antibody to HCV (TOYO rapid test). Those with positive test results and a randomly selected control group of patients with negative test results were invited to participate in a telephone interview about possible risk factors of infection. In total, 1720 patients were screened. The HCV infected group consisted of 32 patients (56.3% men, mean age 55.4±9.4 years) and a control group of 96 patients (55.2% men, mean age 54.8±9.5 years). Results The prevalence of HCV infection among screened patients was 1.9%. The odds ratio (OR) of HCV infection in patients who reported blood transfusions before 1993 was 7.7 (95% CI 2.1-27.6) compared to those who did not have a blood transfusion or had later. HCV infection was diagnosed more often among patients who were blood donors before 1993 compared to those who were not donors or were later (OR 5.6; 95% CI 2.3-13.1). Having a tattoo increased the likelihood of HCV infection by 5.6 times (95% CI 2.1-14.4). Injection of illegal drugs was reported by 8.4% of HCV positive patients, 34.9% of them was in a prison for more than 3 months. Conclusions Primary health care institutions should consider screening people who are at high risk of HCV infection. Key messages Risky behaviours are associated with higher risk of HCV infection. Epidemiologic data on HCV infection is crucial for developing optimal healthcare policies for the prevention and treatment of HCV infection.
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- 2021
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8. Experimental determination of the chemical changes in the electron density on indium nuclei by the γ‐spectrometric ΔIγ/Iγ method
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Remeikis, V., Makariūnas, K., Dragūnas, A., Davidonis, R., and Kalinauskas, R.L.
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- 2000
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9. Inclusion by design: Research into a suitable form of housing and inclusion of vulnerable target groups in Amsterdam
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Dragūnas, Karolis (author) and Dragūnas, Karolis (author)
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In recent years, Dutch society has been in transition. The traditional welfare state is being transformed into a participation society, where citizens are self-reliant and less dependent on the government. Due to changes in society and new insights into the importance of inclusion, citizens who are in a vulnerable position should be received as little as possible by authorities and be transferred as soon as possible to self-sufficient living. The municipalities are responsible for providing the accommodations. In order to live as independently as possible in the neighborhood, professional care is kept to a minimum and support systems are developed, consisting of volunteers and local residents. As an increasing number of vulnerable people come to live in the neighborhood, there is a greater need for small, affordable, self-sufficient homes, and also for residential environments in which attention is paid to fellow residents. The research focuses on finding a suitable form of housing and the elements that lead to inclusion of vulnerable target groups in Amsterdam. The research results in a building in which different people live under one roof. The building offers opportunities to meet each other, to develop social contacts and to participate in society., New Amsterdam - between standard and ideals, Architecture, Urbanism and Building Sciences | Dwelling
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- 2019
10. Skydinių namų konstrukcinių elementų stiprumo tyrimas
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Dragūnas, Arnas and Sušinskas, Saulius
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sija ,medinės konstrukcijos ,wooden structure ,perdanga ,beam ,skydiniai-karkasiniai namai ,panel-frame houses ,flooring ,floor ,paklotas - Abstract
Baigiamajame magistro darbe tiriama skydinių namų skirtingų perdangų konstrukcijų stiprumas. Baigiamajį magistro darbą sudaro trys pagrindinės dalys. Pirmojoje dalyje pateikiama skydinių-karkasinių namų raida pasaulyje, jų privalumai ir konstrukcijos. Antrojoje dalyje pateikiama tryjų perdangų laikančiųjų konstrukcijų elementai ir paklotas, kurie bus tiriami. Trečiojoje dalyje skaičiuojama konstrukcijų laikančiosios sąvybės, pateikiami skaičiavimo grafikai ir rezultatai. Tiriamajame darbe buvo ištirta tryjų skirtingų perdangų laikančiųjų konstrukcijų laikomoji galia ir įlinkis keičiant sijų ilgį, bei tikrinama drėgmei atsparios plokštės laikomoji galia ir įlinkis. Apskaičiuota perdangų pagaminimo sąnaudos bei kaina, parinktas optimalus variantas naudojantis SAW metodu., In final master degree I research prefabricated houses of different overlays constructions strength. The master thesis consist of three main parts. The first part includes panel-frame houses developments in the world, their advantages and constructions. The second part includes three overlays bearing structural elements and flooring that will be investigated. The third part includes calculated structures bearing features, charts and calculation results are being made for those calculations. In thesis it was researched three different overlays bearing structurea bearing capacity and deflection by changing the lenght of the beams, as well as tested moisture-resistant panels bearing capacity and deflection. The estimated overlays of production labor costs as well as price, using SAW method the optimal variant was selected.
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- 2017
11. Atsinaujinančių energijos išteklių technologijų skatinimo schemų kaštų ir naudos analizė
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Dragūnas, Žilvinas and Konstantinavičiūtė, Inga
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support schemes ,imitacinis modeliavimas ,simulation model ,kaštai ir nauda ,costs and benefits ,atsinaujinantys energijos ištekliai ,paramos schemos ,renewable energy - Abstract
Energijos gamybos skatinimas naudojant atsinaujinančius energijos šaltinius prasidėjo 2001 m. rugsėjį. 2009 m. Europos komisija nusprendė skatinti atsinaujinančios energijos panaudojimo plėtrą apibrėžiant privalomus kiekvienos šalies AEI panaudojimo įsipareigojimo tikslus 2020 m. Privalomų tikslų nustatymas buvo paremtas kiekvienos ES šalies BVP tenkančiu vienam šalies gyventojui. Tai nurodė aiškų kelią ir viziją atsinaujinančios energijos technologijų plėtrai vidutinės trukmės perspektyvai. Visos ES valstybės narės naudoja skirtingas paramos strategijas siekiant padidinti AEI dalį bendrame galutinės energijos suvartojime. Siekiant įvertinti taikomų paramos priemonių efektyvumą ir veiksmingumą, darbe atlikta keturių šalių (Lietuvos, Danijos, Švedijos ir Vokietijos) lyginamoji analizė ir įvertintas paramos schemų poveikis AEI plėtros įtakai. Baigiamojo darbo pagrindinis tikslas išanalizuoti naudojamų paramos priemonių įtaką bei atlikti AEI panaudojimo kaštų ir naudos analizę 2010 - 2030 m. laikotarpiui., The support for electricity production from renewable energy sources policy was set in September 2001. The broader pathway for all renewables towards 2020 was set and accepted by the European Council, the European Commission and the European Parliament in April 2009. The related policy package, in particular the EU Directive on the support of energy from renewable sources (2009/28/EC), comprises the establishment of binding RES targets for each Member State. The calculation of the particular targets is based on the respective Member State’s GDP per capita. This provides a clear framework and vision for renewable technologies in the mid-term perspective. All EU MS are using different kind of support strategies to increase the share of RES in total gross energy production. In order to evaluate the performance and effectiveness of support policies, the comparative analysis and the impact assessment of support schemes for four countries (Lithuania, Denmark, Sweden, and Germany) have been analyzed. The aim of this thesis is to analyse the used support strategies and derive costs and benefits results from increased RES deployment in the 2010 and 2030 frameworks.
- Published
- 2016
12. Programinių staklių prototipo skirto polimerų apdirbimui projektavimas ir tyrimas
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Dragūnas, Petras, Snapkauskas, Marius, and Kilikevičius, Sigitas
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programinės staklės ,polyacetal ,prototipas ,numerical control milling machine ,prototype ,poliacetalis - Abstract
Šiame darbe projektuojamos ir tiriamos trijų ašių programinės (CNC) staklės skirtos frezuoti poliacetalį bei kitus polimerus. Šis tyrimas aktualus šių laikų tendencijai, kada technologiniai įrenginiai tampa asmeniniais (asmeniniai kompiuteriai, asmeniniai 3D spausdintuvai ir t.t). Pasaulyje panašios staklės nėra naujiena, bet konkretūs tyrimai apie konstrukcijos standumą ir apdirbimo tikslumą dar nebuvo atlikti. Tyrimo rezultatai bus galimai pritaikomi tolimesniam asmeninių CNC frezavimo staklių tobulinimui ir gamybai. Šio magistro projekto tikslas yra sukurti programuojamų CNC staklių prototipą, skirtą POM technologinio plastiko apdirbimui bei ištirti įlinkių įtaką staklių tikslumui. Darbe apžvelgiama apdirbamos medžiagos, poliacetalio, mechanines charakteristikos ir palyginamos su kitų dažnai pramonėje naudojamų medžiagų charakteristikomis. Apžvalga tęsiama apie staklių konstrukcines dalis. Projektinėje dalyje išsirenkama staklių konstrukcija ir suprojektuojama SolidWorks 2016 programine įranga. Atliekamos statinis stiprumo tyrimas, kurios pagrindžia pasirinktą konstrukciją. Suprojektuotos staklės surenkamos ir tiriamos. Pateikiama staklių sąmata ir palyginama su panašiomis staklėmis pardavime. Tiriamojoje dalyje apskaičiuojamos pjovimo jėgos, atsirandančios apdirbant poliacetalį devyniais skirtingais frezavimo režimais. Atliekamas staklių kompiuterinis modeliavimas ir sulyginamas su realiai ištiriamais frezavimo metu atsirandančiais įlinkiais. Atliekama regresijos analizė, kuris parodo, kad konstrukcijos įlinkiams didžiausią įtaką turi pjovimo pastūma. Devyniais skirtingais režimais apdirbama po vieną detalę ir išmatuojamas tikslumas. Išrenkamas optimalus režimas pagal konstrukcijos įlinkius ir apdirbimo tikslumą. Sudaromas režimų įlinkių ir tikslumo priklausomybės grafikas. Optimaliausiu režimu frezuojamos dvidešimt vienodų detalių ir matuojamos jų apdirbimo tikslumas. Matavimų bei tyrimų rezultatai pateikiami grafiškai. Darbo pabaigoje pateikiamos išvados ir patobulinimai., This paper covers the design and testing of a three-axis computer numerical control (CNC) milling machine for machining polyacetal (POM) and other polymers. This study is relevant in today's trend, when technological devices are becoming personal (personal computers, personal 3D printers, etc.). There are similar machines in the market, but specific studies on the structure rigidity and machining accuracy has not yet been carried out. The research results can be applied to further personal CNC milling machine development and production. This master's project aim is to create a programmable CNC machine prototype for polyacetal machining and to investigate the machine rigidity and accuracy. The paper provides an overview of polyacetal, its mechanical characteristics and comparison with other commonly used industrial materials characteristics. Review is continued on different machine components. Then the best machine structure type is selected and modeled within SolidWorks 2016 software. Simulations of the model are performed to back up the selected structure type. The designed machine is assembled and tested. The price for constructing the machine is compared with similar machines on sale. The study of the machine is begun by calculating cutting forces generated when machining polyacetal by nine different routing regimes. Then a simulation of the machine is performed and the result are compared with the experimentally retrieved data of the strain and deflection occurring during machining. A regression analysis is performed, which shows that the cutting feed rate has the largest effect on the machine structure deflection. With the nine different routing regimes a testing part is machines, for each regime and the accuracy of the machining is measured. The optimal regime is chosen according to the results. A graph showing the dependency of the nine regimes deflection and precision is constructed. With the optimal regime twenty same test parts are machined and measured for obtaining machine accuracy. Measurement and analysis results are presented graphically. At the end of the paper conclusions and improvements are presented.
- Published
- 2016
13. Inovacijų diegimo galimybės turizmo įmonėse
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Dragūnas, Deividas and Jasinskas, Edmundas
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inovacijos ,verslas ,tourism ,business ,turizmas ,innovation - Abstract
Kol kas Lietuvoje, kaip ir daugelyje kitų pasaulio šalių, pavieniai regionai ekonomiškai ir socialiai nevienodai išsivystę, inovacijos taikomos skirtingu mastu. Taigi, šioje vietoje įžvelgiama problema, kad turizmo inovacijų diegimo galimybės Lietuvos turizmo versle kol kas nėra pilnai išnaudojamos, o versle pritaikomos gana retai. Tyrimo objektas – inovacijų diegimas Kauno turizmo įmonėse. Tyrimo tikslas – įvertinti inovacijų diegimo galimybes Kauno turizmo įmonėse. Pagrindiniai darbo uždaviniai: 1. Nustatyti veiksnius, lemiančius inovacijų diegimo galimybes turizmo įmonėse šalies mastu., Individual regions are not equally developed economically and socially in Lithuania and in other countries that is why all innovations are used on a different scale. Tourism innovation possibilities are not completely used in our country, and this is a big problem. The survey object is usage innovations in Kaunas tourism enterprise. The purpose of survey is to evaluate innovation possibilities in Kaunas tourism enterprise.
- Published
- 2016
14. Namo šiluminio rėžimo automatinės valdymo sistemos tyrimas
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Dragūnas, Julius and Kopustinskas, Audris
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šildymo sistema ,heating system ,šildymo kolektorius ,automatika ,automation ,heating collector - Abstract
Automatizuotas ir stabilus šildymo sistemos reguliavimas yra svarbus ne tik žmogaus gyvenimo kokybės užtikrinimui, tačiau ekonomiškumo faktorius. Atliekant įvairių gamintojų šildymo sistemos valdiklių analizę pastebėta, kad visos jos turi gamykliškai parametrizuotus reguliatorius ir valdymo algoritmus, todėl yra poreikis sukurti aplinkos poveikiui jautrią ir ekonomišką automatinę šilumos reguliavimo valdymo sistemą. Darbo tikslas – sukurti ir eksperimento būdu ištirti namo šiluminio rėžimo automatinės valdymo sistemos modelį. Tiriamasis objektas – vienkontūrė patalpos šildymo sistema, kurią šiluma aprūpina vandeninis grindų šildymo kolektorius. Tyrimo metodologija – literatūros analizė, eksperimentinis tyrimas. Sukuriamas matematinis modelis, kurio veikimo rezultatai aprašomi lyginant realaus modelio rezultatais. Baigiamojo magistrinio projekto darbas susideda iš analitinės, projektinės, ekperimentinės ir tyrimų dalių. Analitinėje dalyje analizuojama literatūra ir siekiama išsiaiškinti pagrindinius gyvenamų patalpų grindų šildymo projektavimo reikalavimus, patalpų šildymo termodinaminių procesų sąlygas ir sistemose naudojamus papildomus modulius, kurie leidžia sukurti automatizuotą valdymo sistemą. Projektinėje dalyje aprašomas sukurtas namo šiluminio rėžimo automatinės valdymo sistemos fizinis modelis. Atlikus šildymo sistemos inertiškumo ir išspinduliuojamos energijos tyrimus eksperimentinėje dalyje gauti duomenys buvo panaudoti matematinio modelio aprašymui. Sukurtas reguliatoriaus veikimo algoritmas ir parašyta programa mikrokontroleriui Arduino UNO., Automatic and stable regulation of a heating system is not only important for ensuring personal quality of life but also a factor of cost-effectiveness. During the analysis of heating system controllers of different manufacturers it was noted that all of them have regulators of default parameters and control algorithms, thus a need arises to develop automatic heating regulation control system, which would be sensitive to environmental impact and cost-efficient. The purpose of the project is to design and experimentally analyse the model of automatic control system of the heating regime of a house. The subject analysed is a single-contoured heating system, which is heat supplied by floor water heating collector. Methodology of analysis – literature analysis, experimental research. A mathematical model is developed, the results of which are defined in comparison to results of the actual model. The project of master’s degree thesis comprises analytical, project, experimental and research sections. The analytical section includes analyses of literature and information on the key requirements of designing the floor heating of residential premises, conditions or heating thermodynamic processes and additional modules used with the systems, which allows to develop automatic control system. The project section defines the developed physical model of automatic control system of the heating regime of a house. After research of heating system inertness and emitted power was performed in the experimental section of the paper, the data received were used for the definition of the mathematical model. The regulator operation algorithm was developed and a programme Arduino UNO for microcontroller was created.
- Published
- 2015
15. [Untitled]
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R. Davidonis, A. Dragūnas, V. Remeikis, R.L. Kalinauskas, and K. Makariūnas
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Electron density ,Isotope ,Electron capture ,Chemistry ,Isotopes of cadmium ,Excited state ,Binding energy ,Analytical chemistry ,chemistry.chemical_element ,Spectroscopy ,Indium - Abstract
The γ‐spectrometry method for determination of the relative change ΔλEC/λEC in the partial probability λEC for the 114mIn decay branch by the electron capture (EC), when the nucleus is in different chemical environments, was developed. The method is based on an experimental determination of the relative change ΔIγ/Iγ in the intensity of the γ‐radiation which is emitted by the excited daughter 114Cd nuclei after EC. The 114mIn decay by EC in indium metal, In2O3 and InAs was compared. The largest ΔIγ/Iγ=(2.5±0.8)·10−4 has been found for InAs relatively to In2O3. The chemical changes in the electron density on the indium nucleus corresponding to the measured ΔIγ/Iγ values have been determined.
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- 2000
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16. Search of the chemical change of the119mSn (T1/2=293 days) radioactive decay rate
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Makariūnas, K., Makariūnienė, E., and Dragūnas, A.
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- 1983
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17. Investigation of the decay rate for71Ge in chemical compounds and calibration of the Mössbauer isomer shift of the 67 keV γ-transition of73Ge
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Makariūnas, K., Dragūnas, A., and Makariūnienė, E.
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- 1987
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18. Effect of chemical structure on the radioactive decay rate of71Ge
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Makariūnas, K., Makariūniené, E., and Dragūnas, A.
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- 1979
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19. Correlations of the119Sn Mössbauer Isomer Shift with Interatomic Distances for Complex Tetrahedral Semiconductors
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A. Dragūnas, M. Balčiūniené, and K. Makariūnas
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Isotope ,Mössbauer effect ,chemistry.chemical_element ,Phosphor ,Crystal structure ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Isomeric shift ,Crystallography ,chemistry ,Isotopes of tin ,Mössbauer spectroscopy ,Atomic physics ,Tin - Abstract
The Mossbauer spectra of the compounds Cu2CdSn(S1−xSex)4 and Cu2CdSn(Se1−xTex)4 (x = 0; 0.25; 0.5; 0.75, and 1) are investigated. The linear increase of the Mossbauer isomer shift with the increase of x is observed. Comparison with the isomer shift for Cu2Sn(S1−xSex)3 and for AgCrSn(S1−xSex)4 reveals the existence two correlations between the Mossbauer isomer shift and the interatomic distance. The isomer shift as well as the interatomic distance increase while replacing S atoms by Se atoms (or Se atoms by Te atoms) in the nearest enivironment of the Mossbauer nucleus. The isomer shift strongly decreases with the increase of the interatomic distance for the compounds, which belong to different systems, but with the same x (with the same nearest environment of tin atoms). [Russian Text Ignored.]
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- 1983
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20. Investigation of the decay rate for71Ge in chemical compounds and calibration of the Mössbauer isomer shift of the 67 keV γ-transition of73Ge
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K. Makariūnas, E. Makariūnienė, and A. Dragūnas
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Nuclear and High Energy Physics ,Electron density ,Isotope ,Isotopes of germanium ,Chemistry ,Electron capture ,Analytical chemistry ,chemistry.chemical_element ,Germanium ,Condensed Matter Physics ,Beta decay ,Atomic and Molecular Physics, and Optics ,Mössbauer spectroscopy ,Physical and Theoretical Chemistry ,Radioactive decay - Abstract
Changes of the radioactive decay rate of71Ge (T1/2=11.43 days) have been studied experimentally for71Ge in some compounds of bivalent and quadrivalent germanium. Relative changes Δλ/λ of the electron capture probability have been measured, and the chemical changes Δρ(0) of the electron density at the germanium nuclei have been determined from these measurements. Values for the Mossbauer isomer shift calibration constants for the 67 keV γ-transition of73Ge have been estimated:C=δ/Δρ(0)=(0.061±0.020) mm·s−1/a.u., Δ〈r2〉=(21±7)·10−3 fm2, ΔR/R=(6.9±2.3)·10−4.
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- 1987
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21. Search of the chemical change of the119mSn (T1/2=293 days) radioactive decay rate
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K. Makariūnas, E. Makariūnienė, and A. Dragūnas
- Subjects
Nuclear and High Energy Physics ,Isotope ,Chemistry ,Branching fraction ,Gamma ray ,Half-life ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Internal conversion ,Isotopes of tin ,Physical and Theoretical Chemistry ,Atomic physics ,Valence electron ,Radioactive decay - Abstract
The differences in decay rates of the nuclear isomer119mSn (T1/2=293 days; the strongly converted M4 transition) have been measured for different chemical compounds. The experimental results show that the119mSn nuclei in the telluride SnTe decay faster then in the metal β-Sn and in the dioxide SnO2 [the relative change Δλ/λ of the decay probability λ is +(3.6±1.4)·10−4]. No measurable difference between the decay rates of119mSn in β-Sn and SnO2 has been observed [(Δλ/λ=−(0.1±1.2)·10−4], irrespective of the great difference in electronic structure of the tin atoms. The results cannot be explained by considering the internal conversion of the valence electrons only. It is necessary to assume that the chemical changes of the decay rate are strongly influenced by the chemical changes of the probabilities of the internal conversion of electrons of the inner shells of the atom. This conclusion is confirmed by theoretical calculations. They show that for the deep inner subshells the relative changes Δαnlj/αnlj of the internal conversion coefficients αnlj are much greater than the relative changes Δρnlj/ρnlj of the electron densities near the nucleus ρnlj.
- Published
- 1983
- Full Text
- View/download PDF
22. Search of the chemical change of the119mSn (T1/2=293 days) radioactive decay rate
- Author
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Makariūnas, K., Makariūnienė, E., and Dragūnas, A.
- Abstract
The differences in decay rates of the nuclear isomer
119m Sn (T1/2 =293 days; the strongly converted M4 transition) have been measured for different chemical compounds. The experimental results show that the119m Sn nuclei in the telluride SnTe decay faster then in the metal ß-Sn and in the dioxide SnO2 [the relative change ??/? of the decay probability ? is +(3.6±1.4)·10-4 ]. No measurable difference between the decay rates of119m Sn in ß-Sn and SnO2 has been observed [(??/?=-(0.1±1.2)·10-4 ], irrespective of the great difference in electronic structure of the tin atoms. The results cannot be explained by considering the internal conversion of the valence electrons only. It is necessary to assume that the chemical changes of the decay rate are strongly influenced by the chemical changes of the probabilities of the internal conversion of electrons of the inner shells of the atom. This conclusion is confirmed by theoretical calculations. They show that for the deep inner subshells the relative changes ?anlj /anlj of the internal conversion coefficients anlj are much greater than the relative changes ??nlj /?nlj of the electron densities near the nucleus ?nlj .- Published
- 1983
- Full Text
- View/download PDF
23. Effect of chemical structure on the radioactive decay rate of71Ge
- Author
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Makariūnas, K., Makariūniené, E., and Dragūnas, A.
- Abstract
The influence of the chemical structure on the electron capture radioactive decay rate of
71 Ge was observed.71 Ge nuclei in bivalent sulphide GeS decay faster than in quadrivalent sulphide GeS2 . The relative change ??/? of the decay constant ? is+(11.4±1.7) · 10-4 .- Published
- 1979
- Full Text
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24. Investigation of the decay rate for71Ge in chemical compounds and calibration of the Mössbauer isomer shift of the 67 keV γ-transition of73Ge
- Author
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Makariūnas, K., Dragūnas, A., and Makariūnienė, E.
- Abstract
Abstract: Changes of the radioactive decay rate of
71 Ge (T1/2 =11.43 days) have been studied experimentally for71 Ge in some compounds of bivalent and quadrivalent germanium. Relative changes Δλ/λ of the electron capture probability have been measured, and the chemical changes Δρ(0) of the electron density at the germanium nuclei have been determined from these measurements. Values for the Mssbauer isomer shift calibration constants for the 67 keV γ-transition of73 Ge have been estimated:C=δ/Δρ(0)=(0.0610.020) mms−1 /a.u., Δ〈r2 〉=(217)10−3 fm2 , ΔR/R=(6.92.3)10−4 .- Published
- 1987
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25. Correlations of the119Sn Mössbauer Isomer Shift with Interatomic Distances for Complex Tetrahedral Semiconductors
- Author
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Dragūnas, A., primary, Makariūnas, K., additional, and Balčiūniené, M., additional
- Published
- 1983
- Full Text
- View/download PDF
26. The development of the rural tourism services in Zarasai district
- Author
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Šileikis, Darius, Jankauskienė, Aida, Žalys, Linas, Matuzienė, Ina, Žičkienė, Skaidrė, Dragūnas, Donatas, Repšienė, Asta, Šavareikienė, Danguolė, and Siauliai University
- Subjects
Marketing and Administration ,Turizmas ,Rural tourism development of services ,Rural tourism ,Kaimo turizmo paslaugų vystymas ,Kaimo turizmas ,Tourism - Abstract
Bakalauro baigiamajame darbe nagrinėjama Zarasų rajono kaimo turizmo sodybų siūlomų paslaugų įvarovė ir nustatomos paslaugų vystymo galimybės Zarasų rajone. Kaimo turizmo tema aktuali praktikai tuo, kad Zarasų rajone gausu gamtinių ir kultūrinių išteklių siūlant atitinkamas paslaugas. Pirmoje darbo dalyje teoriniu aspektu nagrinėjama turizmo samprata, turizmo klasifikacija, turizmo plėtra, ekonominė nauda regionui, kaimo turizmo esmė, raida ir ypatumai, paslaugų vystymo galimybės. Antroje darbo dalyje pristatoma metodologija ir organizavimas, atliekama tyrimo metu gautų duomenų analizė ir pateikiami tyrimo rezultatai. Trečioje yra tiriamoji darbo dalis, kurioje analizuojamas kaimo turizmo paslaugų vystymas Zarasų rajone remiantis atliktos anketinės apklausos duomenimis. Šio darbo išvados ir rekomendacijos gali būti panaudotos sodybų savininkams nustatant tikslus ir strategijas. Pateiktos priemonės klientų pritraukimui. Pagrindiniai rezultatai ir išvados: respondentai siūlomų veiklų įvairovę ir pasiūla kaimo turizmo sodybose Zarasų rajone įvertino neigiamai; siūlomos paslaugos Zarasų rajone neišnaudoja esamo gamtinio ir kultūrinio potencialo turizmo paslaugų plėtrai; siūlomų paslaugų kompleksas kaimo turizmo sodybose yra siauras, dažniausiai siūlant tik vandens pramogas; Zarasų rajone trūksta specializuotų kaimo turizmo sodybų; sodybų savininkai turėtų siūlyti daugiau pažintinių paslaugų, tokių kaip amatų mokymas ir ekskursijų po lankytinus objektus; populiariausios sodybos... [toliau žr. visą tekstą] The Bachelor's thesis concentrates on the analysis of the variety of rural tourism services in Zarasai district and on identifying oportunities of service development in Zarasai district. The issue of rural tourism is relevant, because Zarasai district is rich in natural and cultural resources, wich are not used while providing the services. The first part of the paper examines the theoretical aspect of the concept of tourism, classification of tourism, the development of tourism and its economic benefits for the region, the essence of rural tourism, its development and features, oportunities of service development. The second part presents the research methodology and the structure of the study, the analysis of the data of the research, and, based on these data, analysis of the rural tourism development in Zarasai district is provided. The conclusions and recommendations may be useful for the owners of rural tourism homesteads identifying objectives and strategies for the development of their businesses as well as customer attraction. The main results and conclusions: respondents have evaluated the variety of the activities and the supply of rural tourism homesteads negatively: the scope of services in Zarasai district does not exhaust natural and cultural resources in the tourism services development; the scope of services is narrow, often only offering water activities; Zarasai district lacks specialized rural tourism homesteads; the owners of rural tourism homesteads... [to full text]
- Published
- 2014
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