191 research outputs found
Superautomobilio aerodinaminių savybių tyrimas.
No full textIn this modern world aerodynamics plays vital role in super cars and it predominantly used in Motorsports industry for achieving vehicle better performance.This master thesis portrays that can be viewed about the methods of aerodynamic characteristics and why aerodynamics plays a vital role in super cars in efficient way. By installing spoiler,splitter and drag reduction in super cars for achieving better performance of the vehicle. Propose a method of reducing the drag and increase the down force in efficient way for the better function.As this mainly uses aerodynamic devices to affect the flow, a conventional spoiler is used here to spoil the oncoming flow with different types of spoiler design.Even in today’s modern technique all the super cars are not able to reduce the drag in efficient way because of its overall weight of the vehicle.The most essential thing is replacing all the parts of vehicles metal body by current efficient material will put super cars in question mark because it cannot be used for commercial purpose.So here a proposed method is to trim the side body in design and installing wind splitter and spoiler to achieve better performance in similar geometry shape. Nowadays, all the super cars have independent working of front and rear spoilers, but in this thesis splitter and spoiler are collaborated towards each other in efficient way
ESP sistemos transporto priemonės tyrimas ir transporto priemonės dinamikos analizė imituojant vedyna.
No full textElectronic Stability programme is an active safety system which was introduced by Robert Bosch to improve the stability of the vehicle and prevent the vehicle from an emergency situation such as skidding, understeer, oversteer and rollover accident. With the increase in production of vehicle in developing countries like India, China and introduction of more sports variants by countries like Germany, Italy has lead to increase in number of accidents, so it is of utmost importance that active safety system like ESP must be implemented in all vehicle to protect the passengers from fatalities and reduce the road accidents. To study about the ESP system and analyze the various properties that influence skidding, understeer, oversteer, and rollover specific car model Lamborghini Aventador lp 700 – 4 was chosen and tested by using various regulations in modelling simulation software veDYNA. The testing regulations such as steer step, double lane change, slalom test, circle drive and mu-split was used with varied parameters to know about the limits of the vehicle in various conditions. The graphs generated in the plot - gui of veDYNA software was used to analyze the yaw rate, yaw angle, roll angle, sideslip angle, steering wheel angle and lateral acceleration of the vehicle. The aim of the research is to study about the effectiveness of ESP system using theoretical methods and apply various methods leading to skidding, understeer, oversteer, and rollover using vehicle simulation software veDYNA which is linked with Matlab/Simulink interface
Investigation of cross-linked charge transport compounds.
No full textTitle: Investigation of Cross-Linked Charge Transport Compounds. The author - Mantas Daukša. Leader assistant - Vygintas Jankauskas. Cross-linking organic materials, measuring their solvent resistance and investigating materials mobility of charge carriers using the electrophotographic time-of-flight (XTOF) method
Investigation on the characteristics of diesel engine running on microalgal oil
No full textMikrodumbliai išsiskiria iš visų žinomų biomasės rūšių savo galimybe atliepti ateities iššūkius, jei vertinsim jų prieinamumą, trumpą augimo periodą, greitą prieaugį, derliaus kiekį gaunamą iš ploto vieneto, konkurencijos nebuvimą su dirbama žeme. Šios savybės leidžia dumblių biomasę laikyti tinkamiausia žaliava gaminti biodegalus ir pridėtinę vertę kuriančius antrinius produktus naudojant biologinio perdirbimo technologijas. Šio darbo autorius iškėlė problemą, kad norint atsisakyti dalies iškastinių degalų naudojamų transporto sektoriuje, dalį suvartojamo dyzelino galima būtų sėkmingai pakeisti biodegalais, pagamintais iš mikrodumblių rūšies P.moriformis. Šis disertacinis darbas dedikuotas detaliam mikrodumblių aliejaus naudojamo transporte vertinimui, kuris apėmė mikrodumblių auginimo technologijos parinkimą, variklio degimo proceso skaitinį modeliavimą, pagamintų biodegalų fizikinių-cheminių charakteristikų nustatymą, išsamius dyzelinio variklio eksploatacinių ir aplinkosauginių charakteristikų tyrimus jam dirbant skirtingomis apkrovomis, paankstintais arba pavėlintais degalų įpurškimo kampais bei aktyviu /neaktyviu deginių recirkuliaciniu vožtuvu.
Disertaciją sudaro įvadas, trys skyriai, bendrosios išvados, naudotos litera-tūros sąrašas, autoriaus publikacijų sąrašas ir priedai.
Įvadinėje dalyje suformuluota problematika, aptartas darbo aktualumas ir tyrimų tikslai. Metodika ir įvardinti uždaviniai pabrėžia ir atspindi darbo aktualumą ir jo mokslinį naujumą. Taip pat šioje dalyje supažindinama su disertacinio darbo struktūra ir autoriaus publikacijomis tyrimų tematika.
Pirmasis skyrius skaitytojui leidžia pažvelgti į Lietuvos transporto sektorių ir jo kelių dešimtmečių kelią darnaus mobilumo link, vertinant oro taršos pokyčius. Mikrodumblių potencialo biodegalų gamybą, procesų inžinerijos svarbą ir įvairių sinergijų paiešką siekiant efektyvumo. Apžvelgti mokslininkų tyrimai slėginio suspaudimo varikliuose naudojant grynus augalinius aliejus bei jų mišiniu su mineraliniu dyzelinu. Antrajame skyriuje aprašyta tyrimų metodologija, naudota įranga, eksperimentų eiga, degalų terminės analizės rezultatai ir paklaidų skaičiavimas. Trečiame skyriuje pateikti eksperimentinių tyrimų rezultatai, kurie apima: mikrodumblių aliejaus degimo proceso dyzelinio variklio cilindruose skaitinį modeliavimą, naudojant AVL BOOST programinį paketą; Laboratorinio variklio energetinių ir ekologinių rodiklių pokyčius, priklausomai nuo apkrovos charakteristikos; Reguliavimo charakteristikos paankstinant ir/arba pavėlinant degalų įpurškimą ir jo įtaka dyzelinio variklio energetiniams ir ekologiniams rodikliams; Išorinę greičio charakteristiką varikliui veikiant mikrodumblių aliejaus ir dyzelino mišiniu.Disertacij
Algal Biodiesel in Lithuania: From Promise to Reality
No full textAbstractThe search for alternative fuel sources of organic origin, their adaptation and promotion emerged as one of the key focus areas worldwide, which could bring positive effect on lowering down the fossil fuel prices and solving the environmental problems. Algal biodiesel intended for use in the vehicles is among the solutions for the transport sector. In this article, we made an overview of biodiesel investigation in Lithuania over 11 years. Algae are the third generation biofuel form with high production perspective. This microorganism can be found almost everywhere even in Arctic. Algae can be counted as 55 000 species organism with great number of growth and quantities of biomass per unit. Possibilities and challenges of biodiesel from algae in Lithuania have been analysed. Application and compatibility of algae biodiesel in internal combustion engine has been investigated. Many advantages of biodiesel have been presented as well as some disadvantages were found
Lietuvių tragedijos tipologiniai tyrinėjimai. Juozo Grušo "Herkus Mantas": t. 2
No full textStraipsnyje analizuojamos Juozo Grušo tragedijos Herkus Mantas tipologinės sąsajos su romantine-herojine, šekspyriškąja, egzistencializmo drama. Seniausią Herkaus Manto ideologinį klodą sudaro romantinės-herojinės dramos tradicija, su kuria susijęs kūrinio patetiškumas, patriotika, herojinė dvasia. Šekspyriškas dramatizmas reiškiasi psichologizmu, daugialypiu konfliktu, skausminga idealų ir realybės, individo ir kolektyvo interesų, praeities ir dabarties sandūra. Dramos probleminis-analitinis pradas sietinas su prancūzų intelektine (egzistencializmo) drama. Herkuje Mante gali būti aptiktas ir tarybinės ideologijos klodas, kuris susiformuoja dėl jo panašumo su romantine ir egzistencialistine mąstysena. Didžiausia Grušo, kaip tragedijos autoriaus, jėga – tragedinio siužeto atvirumas, interpretacinis lankstumas, leidžiantis į analizuojamą problemą pažvelgti iš kelių ideologinių sistemų perspektyvos, deklaruojamas idėjas iš vienų pasaulėžiūrinių koordinačių perkelti į kitas Reikšminiai žodžiai: Tragedijos; Drama (žanras); Egzistencializmas; DramaturgijaThe article analyses typological links of the tragedy Herkus Mantas by Juozas Grušas with the romantic heroic existentialist Shakespearean drama. The oldest ideological stratum in Herkus Mantas is the tradition of the romantic heroic drama related to emotionality, patriotic feelings and heroic spirit. Shakespearean dramatism is manifested by psychological approach, multiple conflict and painful collision of ideals and reality, interests of the individual and collective interests, the past and the present. The problem and analysis grounds of the drama is to be linked with the French intellectual (existentialist) drama. Herkus Mantas also includes a stratum of the Soviet ideology formed due to its similarity to romantic and existentialist way of thinking. The most powerful feature of Grušas as a tragedy author is openness of the tragedy story, interpretational flexibility making it possible to look at the problem in question from several ideological angles and transfer the ideas declared from one system of outlook coordinates to another
Assessment of microalgae oil as a carbon-neutral transport fuel: engine performance, energy balance changes and exhaust gas emissions /
No full textNotwithstanding the substantial progress acheved since 2010 in the attempts to realize the potential of microalgae biofuels in the transportation sector, the prospects for commercial production of CO2-neutral biofuels are more challenging today than they were in 2010. Pure P. moriformis microalgae oil was subjected to unmodified engine performance testing as a less investigated type of fuel. Conventional diesel was used as a reference fuel to compare and to contrast the energy balances of an engine as well as to juxtapose performance and emission indicators for both unary fuels. According to the methodology applied, the variation of BSFC rates, BTE, smoke opacity, NOx, HC, CO2, O2, and exhaust gas temperature on three different loads were established during compression ignition (CI) engine operation at EGR Off, 25% EGR, 18% EGR and 9% EGR modes, respectively. Simulation model (AVL Boost/BURN) was employed to assess the in-cylinder process parameters (pressure, pressure rise, temperature, temperature rise, ROHR, and MFB). Furthermore, the first law energy balances for an engine running on each of the test fuels were built up to provide useful insights about the peculiarities of energy conversion. Not depending on EGR mode applied, the CI engine running on microalgae oil was responsible for slightly higher BTE values, drastically reduced smoke opacity, higher CO2 values, and smaller O2 concentration, marginally increased NOx levels and lower total energy losses (in %) if compared to the performance with diesel fuel
New insights into algae factories of the future
No full textThe total combined weight of biological material on planet Earth has been estimated in one source at about 75 × 109 t. Of this: crops comprise 2 × 109 t (2.7%) as well as microbes, fungi, algae and similar types of microorganisms are estimated to comprise over 50% of the total amount. Microalgae is outstanding among all the types of biomass sources in its ability to respond to the challenges of the future in terms of availability, high growth and production rates, yield per unit area, not competing for arable land, being most suitable optimal sources for both liquid and gaseous biofuels and valuable co-products within biorefineries. It is logical that the increased ability to occupy new niches in the energy sector is determined by uptake of the new forms of biomass exploitation coupled with environmental impact reduction. This could explain the worldwide interest in exploiting algal biomass as an ideal attribute for photosynthetic capture of anthropogenic carbon that reached a record high of ~ 10 Pg C yr−1 in 2014. In this review, we outline microalgae's potential to capture carbon in coal-fired power plant, discuss the advantages of photosynthetic organisms as a source for biodiesel and solid biofuel production, discuss the process engineering, different synergies and legislative factors needed to make the process efficient and economically viable. Before commercial-scale installations become feasible, however, numerous points still have to be resolved. In order to identify potentials and obtain recommendations for action, co-authors have studied in detail various options for climate-beneficial recycling and trapping CO2 in the algae factories of the future that potentially could be built in the European humid continental climate countries.pt. 1vol. 8
18FDG-PET/CT Integration in Radiotherapy Planning for The Treatment of Head and Neck Cancer Patients after Induction chemotherapy
No full textAuthor: Mantas Jurevičius Title: 18FDG-PET/CT Integration in Radiotherapy Planning for The Treatment of Head and Neck Cancer Patients after Induction Chemotherapy. Purpose: To evaluate 18FDG-PET/CT and contrast enhanced computer tomography (CECT) effects on gross tumour volume (GTV) in head and neck cancer before and after induction chemotherapy (IC). Objectives: 1. To evaluate 18FDG-PET/CT and CECT interobserver variability in gross tumor volume in head and neck cancer before and after IC. 2. To evaluate 18FDG-PET/CT and CECT intraobserver variability in gross tumor volume in head and neck cancer before and after induction chemotherapy. 3. To evaluate 18FDG-PET/CT and CECT variability in gross tumor volume in head and neck cancer before and after induction chemotherapy. Methods: 10 head and neck cancer patients 18FDG-PET/CT and enhanced contrast CT images before and after IC. Five observers delineated GTV on each modality before and after IC. After one month delineation was repeated by the same observers. Results: There were no significant differences in the GTV across image modalities when compared interobserver and intraobserver variability in 18FDG-PET/CT and CECT. There were significant differences between the GTV image modalities in 18FDG-PET/CT and CECT. Conclusions: 18FDG-PET/CT can be included in the delineation of GTV during radiotherapy planning before and after IC. 18FDG-PET/CT GTV volumes were smaller than CECT. 18FDG-PET/CT inclusion in radiotherapy planning can change patient outcomes
Imposition of an attachment on property in criminal procedure: regulation and issues
No full textKriminālprocesuālais mantas arests ir personas īpašumtiesību būtiski ierobežojošs procesuālais līdzeklis. Darba mērķis ir veicināt vienotu izpratni par šī procesuālā līdzekļa piemērošanu un ietekmi. Darba uzdevumos ir noteikt aktuālās problēmas spēkā esošā mantas aresta regulējumā, kā arī analizēt mantas aresta un tā atsevišķu elementu izpratni teorijā un tiesībsargājošo iestāžu praksē. Darba rezultātā ir izvirzīti secinājumi par mantas aresta juridisko dabu, par lēmuma par mantas aresta uzlikšanu procesuālo formu, par personas pamattiesību ierobežojumiem, kas izriet no mantas aresta un to samērīgumu ar mantas aresta mērķiem, kā arī par citu valstu kriminālprocesuālā mantas aresta normatīvo regulējumu. Pētnieciskajā darbā ir izteikti priekšlikumi veikt grozījumus Kriminālprocesa likumā, Krimināllikumā un citos normatīvos aktos.Attachment of property in criminal proceedings imposes limitations on human rights to own and use property. Purpose of this research paper is to benefit the concept of attachment. Author has defined tasks of this paper as follows - to acknowledge issues in current legal framework, to analyze the common concept of attachment of property in legal theory and in practice of police and judicial authorities. Paper resulted in assessments about legal nature of attachment, legal framework of decision to impose attachment of property, limitations on human rights which result from imposed measures and their proportionality with purpose of measures, and about legal frameworks of other countries. Author made propositions to amend Criminal Procedure Law, Criminal Law and other codes to benefit legal framework of attachment of property
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