Thesis--Stanford University. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.) -- Mississippi State University. Department of Civil Engineering. / Title from title screen. Includes bibliographical references.

Thesis (M.S.)--Mississippi State University. Department of Civil and Environmental Engineering. / Title from title screen. Includes bibliographical references.

Thesis (Ph.D.) -- Mississippi State University. Dave C. Swalm School of Chemical Engineering. / Title from title screen. Includes bibliographical references.

Thesis (M.S.)--Humboldt State University, 2009. / Includes bibliographical references (leaves 42-44). Also available via Humboldt Digital Scholar.

Thesis (M.S.) -- Mississippi State University. Department of Civil Engineering. / Title from title screen. Includes bibliographical references.

Baigiamasis magistro darbas – dizertacija „Vandentvarkos statinių būklė Prienų rajone“ Projekto autorius studentas V.Remeika Lietuvos žemės ukio universiteto, 05.2009 Darbo apimtis : 6 skyriai, išvados, naudotos literatūros sąrašas, 72 puslapiai, 14 lentelių, 19 paveikslėlių. Literatūros sąrašas susideda iš 23 šaltinių. Darbe analizuojama vandentvarkos statinių būklės blogėjimas. Investicijų jo techninei priežiurai yra nepakankamai , nes valstybė ir savininkai negali suteikti pakankamai lėšų, tai reikštų, kad neįmanoma užtikrinti normalaus įrangos funkcionavimo. Buvo prognozuojama vandens struktūros tvarkymo kritimo nuosmukis, kuris rodo, strukūros lygio kritimą po ilgo naudojimo. Didžioji dauguma Europos šalių nuotėkų tvarkymo problemas sprendžia remiantis pagal teritorijos tvarkymo standartus. Jie sujungia specializuotas vandens saugojimo sistemas į bendrą nuotekų valdymo sistemą.Vadovaujantis nustatyta tvarka, Vandens ir Žemes sąjungos ar Vandens skyriai Olandijoje ir Vokietijoje sprendžia nuotekų tvarkymo problemas.Tai užtikrina pakankama finansavimą, kuris yra būtinas gerai vandentvarkos būklei. Patariama daryti pertvarka kaimo vandens valdyme.Tai yra reikšminga savivaldos principe kaimo didžiajai vandens sistemai, kol steigiamos kaimo vandens valdymo sąjungos, kaip tai buvo padaryta Vokietijoje. Šis uždavinys yra analizuoti galimas perspektyvas kaimo vandens sistemos valdymo reorganizavime. Tyrimo... [toliau žr. visą tekstą] / Of the final master work – theses "State of water management structures in Prienai district" The author of the project V. Remeika, student of Lithuanian University of Agriculture, 05 2009 Work extent : 6 chapter, conclusions, the list of used literature; 72 pages, 14 tables, 19 pictures. Literature lists extent 23 literature sources. The worsening state of rural water structures is analyzed in the article. Investments for its technical maintenance are not enough because the State and landlord cannot assign enough that means to ensure normal functioning of the equipment. Were made prediction of water management structures falling into decay which shows breaking down structures level after long use. Great majority of European countries solves wastewater management problems referring to the territorial – based Standard. They combine specialized water saving subsystems into a common wastewater management system. Following the established order, Water and Land Unions or Water Departments solve wastewater management problems in Germany and Holland. It ensures sufficient financial assignations for the wastewater management. The reconstruction of rural water management is suggested. It is purposeful to grand the rural water management on the self-governing principle while establishing rural water management unions, as it has been done in Germany. The aim of the paper is to analyse the possible prospects of village water management system reorganization. Tasks of the investigation... [to full text]

Thesis (M.L.A.)--Mississippi State University. Department of Landscape Architecture. / Title from title screen. Includes bibliographical references.

Thesis (M.S.)--Mississippi State University. Department of Civil and Environmental Engineering. / Title from title screen. Includes bibliographical references.

Transport properties of novel sulfonated wholly aromatic copolymers and the state-of-the-art poly(perfluorosulfonic acid) copolymer membrane for fuel cells, Nafion, were compared. Species transport (protons, methanol, water) in hydrated membranes was found to correspond with the water-self diffusion coefficient as measured by pulsed field gradient nuclear magnetic resonance (PFG NMR), which was used as a measure of the state of absorbed water in the membrane. Generally, transport properties decreased in the order Nafion > sulfonated poly(arylene ether sulfone) > sulfonated poly(imide). The water diffusion coefficients as measured by PFG NMR decreased in a similar fashion indicating that more tightly bound water existed in the sulfonated poly(arylene ether sulfone) (BPSH) and sulfonated poly(imide) (sPI) copolymers than in Nafion. Electro-osmotic drag coefficient (ED number of water molecules conducted through the membrane per proton) studies confirmed that the water in sulfonated wholly aromatic systems is more tightly bound within the copolymer morphology. Nafion, with a water uptake of 19 wt % (λ = 12, where λ = N H2O/SO3H) had an electro-osmotic drag coefficient of 3.6 at 60°C, while BPSH 35 had an electro-osmotic drag coefficient of 1.2 and a water uptake of 40 wt % (λ = 15) under the same conditions. Addition of phosphotungstic acid decreased the total amount of water uptake in BPSH/inorganic composite membranes, but increased the fraction of loosely bound water. Zirconium hydrogen phosphate/BPSH hybrids also showed decreased bulk water uptake, but contrary to the results with phosphotungstic acid, the fraction of loosely bound water was decreased. This dissimilar behavior is attributed to the interaction of phosphotungstic acid with the sulfonic acid groups of the copolymer thereby creating loosely bound water. No such interaction exists in the zirconium hydrogen phosphate materials. The transport properties in these materials were found to correspond with the water-self diffusion coefficients. Proton exchange membrane (PEM) transport properties were also found to be a function of the molecular weight of sulfonated poly(arylene thioether sulfone) (PATS). Low molecular weight (IV ~ 0.69) copolymers absorbed more water on the same ion exchange capacity basis than the high molecular weight copolymers (IV ~ 1.16). Surprisingly, protonic conductivity of the two series was similar. Moreover, the methanol permeability of the low molecular weight copolymers was increased, resulting in lower membrane selectivity and decreased mechanical properties. The feasibility of converting the novel sulfonated wholly aromatic systems to membrane electrode assemblies (MEAs) for use in fuel cells was studied by comparing free-standing membrane properties to those of MEAs assembled with standard Nafion electrodes. Significantly higher interfacial resistance was measured for BPSH samples. Fluorine was introduced into the copolymer backbone by utilizing bisphenol-AF in the copolymer synthesis (6F copolymers). These 6F copolymers showed a markedly lower interfacial resistance with Nafion electrodes and correspondingly greater direct methanol fuel cell performance. It was proposed that the addition of the hexafluoro groups increased the compatibility of the PEM with the highly fluorinated Nafion electrode. / Ph. D.