Kultūros paveldo informacijos pusiau automatinis valdymas ir tyrimai naudojant 3D technologijas

The identification, investigation and preservation of cultural heritage is one of the main challenges for con­temporary society. It’s closely connected with several dimensions: technology transfer, scientific investiga­tions, global-local rhetoric, cultural tourism, armed conflicts, immigration, cultural changes, investment flows, new transport infrastructures etc. Nowadays, organizations responsible for heritage investigation and management are very often forced to deal with a lack of resources, which are crucial for proper heritage identification, investigation and preservation, as well as their maintenance and protection. It is particularly problematic for countries with low GDP or an unstable political situation. The possible solution of these problems could be an information management-based methodology, connected with an automated and semi-automated he­ritage investigation and monitoring software system, which based on 3D technologies. Two cases of cultural heritage (burial mounds and old towns) and two system prototypes are presented in this article. The first prototype – The System of Automated Detection of Prehistoric Burial Mounds Margo was developed and tested by Vilnius University as a part of the project The Beginnings of Lithuanian Statehood According to the Exploration of the Dubin­giai Microregion (2011–2015); the other prototype was developed and tested by Vilnius University and Terra Modus Ltd. in frame of the project The Creation of Automated Urban Heritage Monitoring Software Prototype (2014). In this article, we present the main results of both projects. 3D scanning technology is the most accurate method of finding the heritage objects in a natural landscape and capturing the situation of an evolving cultural heritage object or complex at a given time. As a cultural heritage object or complex is evolving continuously, two 3D point clouds created at different time allow to reliably trace potential changes. The monitoring of large scale heritage complexes, such as urban heritage objects, is a resource demanding task and in such cases a semi-automatic, computer-based 3D visual analysis is appropriate. A comparison of 3D visual data, captured during different times, advances to a next level when utilizing methods of 3D photo­grammetry, which make it possible (at least partially) to create 3D point clouds from old photos, giving us opportunities to expand research by adding empirical data captured before 3D scanning equipment and also lowering the costs of conducting such research.Kultūros paveldo tyrimai ir išsaugojimas yra vienas iš pagrindinių šių dienų visuomenės iššūkių, susijusių su daugelių šiandienos socialinių, kultūrinių, technologinių aktualijų. Šiomis sąlygomis daugumai orga­nizacijų kyla išteklių, būtinų visaverčiam paveldo monitoringui ir išsaugojimui, problema. Ypač tai ryšku šalyse, kurių BVP yra mažesnis ar politinė situacija ne tokia stabili. Straipsnyje aptariamas vienas galimų šios problemos sprendimų: informacijos valdymo metodologija grįsto požiūrio ir 3D lazerinio skenavimo technologijų taikymas kultūros paveldo srityje. Straipsnyje aptariami du tirti paveldo atvejai (pilkapiai ir Vilniaus senamiestis), siejami su dviem skirtingo informacinio pobūdžio uždavinių sprendimais – pusiau automatinės paveldo objektų paieškos natūraliame kraštovaizdyje ir paveldo objektų kaitos monitorin­go metodologijos

Screening of some vegetables for the biotransformation of bicyclo[3.3.1]nonane-2,6-diol diacetate

Vegetables as biocatalysts were screened for the stereoselective biotransformation of racemic bicyclo[3.3.1]nonane-2,6-diol diacetate. The best results were obtained using the roots of carrot (Daucus carota) and parsnip (Pastinaca sativa) and the rootstocks of ginger (Zingiber officinale). During the biotransformation of racemic bicyclo[3.3.1]nonane-2,6-diol diacetate the enzymatic hydrolysis took place. Under different reaction conditions, i.e. the reaction temperature and time, and using different plant material as biocatalyst, (1R,2R,5R,6R)-(+)-bicyclo[3.3.1]nonane-2,6-diol monoacetate or (1S,2S,5S,6S)-(-)-bicyclo[3.3.1]nonane-2,6-diol monoacetate were obtained as reaction products. (–)- Enantiomer with the optical purity of 29.3% was obtained at 25°C using parsnip as biocatalyst for 2 days and (+)- enantiomer with the optical purity of 44.1% was obtained at 30°C using carrot for 3 days

Įvairių alyvuogių aliejų cheminiai, elektrocheminiai bei tribologiniai tyrimai ir jų elgsena ant plieno

Tirta įvairiuose Maroko regionuose pagamintų skirtingo rūgštingumo alyvuogių aliejų pavyzdžių cheminės sudėtys ir fizinės savybės, jų įtaka tribologinėms ir antikorozinėms charakteristikoms. Cheminė sudėtis nustatyta naudojant IR, 1H ir 13C BMR spektroskopijos metodus. Tirtų aliejų cheminė sudėtis skiriasi nedaug (laisvųjų riebiųjų rūgščių kiekis ir jų sudėtis trigliceriduose). Vienareikšmiškai nustatyta, kad riebiosios rūgštys aliejuose yra palmitino ir / arba stearino rūgštys, nesočiosios – oleino ir linolo rūgštys. Įvertintas aliejų stabilumas oksidacijai. Ribinio kampo matavimo ir elektrocheminio impedanso spektroskopijos metodais nustatyta, kad aliejaus plėvelės ant plieno yra poringos, todėl korozijos inhibavimo efektyvumas siekia 27–75 %. Įvertinti trinties koeficientai, aptariamas suteptų paviršių dilumasThe influence of different chemical composition and physical properties of olive oils, produced from various districts in Morocco with various acidic numbers (from 1.76 to 18.01), on their tribological performance and corrosion protection has been investigated. The chemical composition was determined by means of IR, 1H and 13C NMR spectroscopy. The investigated olive oils show small quantitative and qualitative differences between each other (the amount of free fatty acids and the composition of fatty acids in triglycerides). The spectroscopic data let us unambiguously determine in general that the main fatty acids in oils are saturated palmitic and/or stearic acids, unsaturated oleic and linoleic acids except linolenic acid. The oxidation stability of oils was estimated. The contact angle measurements and electrochemical impedance spectroscopy data show that all films of olive oils on the surfaces of steels are porous; therefore, the values of corrosion inhibition efficiency are relatively low and ranged from 57 to 75%. The variations of friction coefficients and their mean values, the wear of steel covered by olive oils were estimated. The oils with the highest oxidation stability also show better lubricating propertiesVilniaus Gedimino technikos universitetasVilniaus universitetasVytauto Didžiojo universitetasŽemės ūkio akademij

Nurodymai melioracijos projektams sudaryti. D. 4. Drėkinimas

Bibliogr.: p.81Vytauto Didžiojo universitetasŽemės ūkio akademij

Bioinžinerija. Laboratoriniai darbai ir pratybos

Pateikta laboratorinių darbų ir pratybų metodinė medžiaga