Yes / The design of new functional crystalline materials requires an understanding of the factors that control salt and co-crystal formation. These states often only differ in the location of the proton and are influenced by chemical and crystallographic factors. The interaction between a carboxylic acid and a pyridine is a frequently used supramolecular synthon in crystal engineering which can exist as either a co-crystal (CO2H⋯N) or salt (CO2−⋯HN+). The results of a Cambridge Structure Database search indicate that the nature of the functional groups on the pyridine play a stronger role in selection of the phase than those of the acid. However, the nature of the local hydrogen bonding of the interaction also adjusts the potential for proton transfer. This was demonstrated by ab initio modelling of the energy landscape for binary and ternary co-crystals by inclusion of varying components of the local environment.

Yes

SbSI(Sb2Se3)0,25 kristalai išauginti Kietojo kūno optinėje mokslinėje laboratorijoje. Jie sudaryti iš SbSI grandinėlių ir Sb2Se3 domenų, nusitęsusių c(z) kristalografinės ašies kryptimi. Jeigu gryname SbSI kristale grandinėlės yra nesuspaustoje būsenoje (Tc =295 K). Suspaustų SbSI grandinėlių feroelektrinio fazinio virsmo temperatūra išauga. Pasaulinėje literatūroje nėra duomenų, kokia SbSI(Sb2Se3)0,25 kristalo feroelektrinio fazinio virsmo temperatūra Tc. / The SbSI(Sb2Se3)0,25 crystals are grown in the Optical science laboratory of solid body. They are made from SbSI chains and Sb2Se3 domains, which extend c(z) to the crystallographic axis vector. If the clear SbSI crystals chases are in uncompressed phase (Tc = 295K), the temperature in ferroelectrics phase transformation grows. There is no data in literature about the SbSI(Sb2Se3)0,25 crystals ferroelectric transition temperature Tc.

Thesis (Ph. D.)--University of Alabama at Birmingham, 2009. / Title from PDF title page (viewed Feb. 3, 2010). Additional advisors: Renato Camata, Derrick Dean, Chris M. Lawson, Andrei Stanishevsky, Sergey Vyazovkin. Includes bibliographical references (p. 133-140).

Paskutiniais dešimtmečiais puslaidininkių fizika vaidino svarbų vaidmenį beveik kiekvienoje šiuolaikinių technologijų srityje. Šiame greitai besikeičiančiame pasaulyje mūsų jau nebetenkina supantys buities ir darbo prietaisai, valdomi naudojantis elektronais. Mums reikalingas didesnis kompiuterių operatyvumas, didesnė atminties talpa, greitesnis telekomunikacinis ryšys, ir todėl reikalingos naujos technologijos bei sprendimai. Naujas žingsnis fotoninės struktūros. Žinių ir technologijų pasiekimai leidžia fotoninių sturktūrų savybes taikyti šviesos valdymui. Dabartiniame optinės fizikos tyrinėjimų etape šviesos sąveika su medžiaga labai aktuali: ji gali atrodyti universali ir invariantiška, kadangi šviesa jau kontroliuojama pasitelkus hibridinius fotoninius kristalus. Šių darinių tyrimai patrauklūs tiek fundamentaliam, tiek taikomajam mokslui. Į opalą infiltravę skystąjį kristalą, gauname hibridinį fotoninį kristalą. Jo optines savybes galima keisti priklausomai nuo infiltruotos medžiagos lūžio rodiklio. Fotoniniai kristalai, reikia tikėtis, bus taikomi ateities fotoniniuose įrenginiuose, telekomunikacijoje. Su šia sritimi siejamos tokios pat ar net didesnės viltys, kokios buvo siejamos su prieš 50 metų išrastu puslaidininkiniu tranzistoriumi, pakeitusiu techniką ir davusiu impulsą naujoms mokslo kryptims. Teoriškai fotoninių kristalų egzistavimą nepriklausomai vienas nuo kito 1987 metais pirmieji aprašė E.Jablonovičius ir S. Johnas. Tačiau prireikė dar dešimt metų, kol buvo... [toliau žr. visą tekstą] / We live in the rapidly developing technological world. However, fields of communication, computer memory, and data processing require considerable improvements. The speed of data transportation is acceptable but capacity is low. There is a growing need for new technologies that rapidly detect and treat diseases at an early stage or even pre-stage. When we get accustomed to the advance, we demand more compact, energy-efficient, rapidly-responding and environmentally-safe technologies. During the last century this problem was solved by switching to transportation of electronic data, which connected people around the world. This approach had changed our lives, but about twenty years ago this technology reached its limits, while need for an even higher transportation capacity increases. Now we need faster computers and other state-of-the-art technological solutions: electrons are too slow and we have to use photons. Over the last decade, the steady progress regarding ability to fabricate hybrid photonic nanostructures led to a rich variety of different one-, two-, and three-dimensional dielectric/organic and/or metallic periodic structures. They demonstrate qualitatively new and fascinating linear-optical, nonlinear-optical, and quantum-optical features which provide an unprecedented control of light propagation and light-matter interaction. Photonic-based technology, coupled with nanotechnology, can meet many of these challenges. In this work fabrication of hybrid photonic... [to full text]

No / Intensive research in bio-engineering has been conducted in the search for flexible biomaterials that could support cell growth and cells attachment. Flexible synthetic materials that support cell growth without the aid of synthetic extracellular matrix proteins are still rare. Cholesteryl liquid crystal containing cholesteryl moieties may have suitable biological affinity. Human keratinocytes (HaCat) were cultured with a nematic liquid crystal and three cholesteryl liquid crystals of different formulation. Subsequently, the trypan blue dye exclusion assay was used to determine cell viability in the liquid crystals. The two classes of liquid crystal were characterized by Differential Scanning Calorimeter (DSC) and polarizing microscope (POM) to understand the nature of the interface material. The cell viability study in medium containing liquid crystals verified that liquid crystals had no effects on cell viability. However, only the surface of cholesteryl liquid crystal has shown affinity to HaCat cells. In addition, cells continued to proliferate in the presence of liquid crystals without a change of medium for eight days. No sign of exothermic and endothermic activities at 370C were observed from the DSC test results for the three samples. Biological and mechanical test result of the cholesteryl liquid crystals has shown that cholesteryl liquid crystals are non toxic and support cell attachment without extracellular matrix protein at very low elasticity.

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published_or_final_version / abstract / Mechanical Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / abstract / Mechanical Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Physics / Master / Master of Philosophy