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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
281

Electronic Coupling Effects and Charge Transfer between Organic Molecules and Metal Surfaces

Forker, Roman 12 January 2010 (has links)
We employ a variant of optical absorption spectroscopy, namely in situ differential reflectance spectroscopy (DRS), for an analysis of the structure-properties relations of thin epitaxial organic films. Clear correlations between the spectra and the differently intense coupling to the respective substrates are found. While rather broad and almost structureless spectra are obtained for a quaterrylene (QT) monolayer on Au(111), the spectral shape resembles that of isolated molecules when QT is grown on graphite. We even achieve an efficient electronic decoupling from the subjacent Au(111) by inserting an atomically thin organic spacer layer consisting of hexa-peri-hexabenzocoronene (HBC) with a noticeably dissimilar electronic behavior. These observations are further consolidated by a systematic variation of the metal substrate (Au, Ag, and Al), ranging from inert to rather reactive. For this purpose, 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) is chosen to ensure comparability of the molecular film structures on the different metals, and also because its electronic alignment on various metal surfaces has previously been studied with great intensity. We present evidence for ionized PTCDA at several interfaces and propose the charge transfer to be related to the electronic level alignment governed by interface dipole formation on the respective metals. / Zur Analyse der Struktur-Eigenschafts-Beziehungen dünner, epitaktischer Molekülfilme wird in situ differentielle Reflexionsspektroskopie (DRS) als Variante der optischen Absorptionsspektroskopie verwendet. Klare Zusammenhänge zwischen den Spektren und der unterschiedlich starken Kopplung zum jeweiligen Substrat werden gefunden. Während man breite und beinahe unstrukturierte Spektren für eine Quaterrylen (QT) Monolage auf Au(111) erhält, ist die spektrale Form von auf Graphit abgeschiedenem QT ähnlich der isolierter Moleküle. Durch Einfügen einer atomar dünnen organischen Zwischenschicht bestehend aus Hexa-peri-hexabenzocoronen (HBC) mit einem deutlich unterschiedlichen elektronischen Verhalten gelingt sogar eine effiziente elektronische Entkopplung vom darunter liegenden Au(111). Diese Ergebnisse werden durch systematische Variation der Metallsubstrate (Au, Ag und Al), welche von inert bis sehr reaktiv reichen, untermauert. Zu diesem Zweck wird 3,4,9,10-Perylentetracarbonsäuredianhydrid (PTCDA) gewählt, um Vergleichbarkeit der molekularen Filmstrukturen zu gewährleisten, und weil dessen elektronische Anordnung auf verschiedenen Metalloberflächen bereits eingehend untersucht worden ist. Wir weisen ionisiertes PTCDA an einigen dieser Grenzflächen nach und schlagen vor, dass der Ladungsübergang mit der elektronischen Niveauanpassung zusammenhängt, welche mit der Ausbildung von Grenzflächendipolen auf den entsprechenden Metallen einhergeht.
282

Net Positive Water

Ma, Billy January 2013 (has links)
‘Net Positive Water’ explores the capability of domestic architecture to combat the developing urban water problem. Urban intensification is contributing to the volatility of urban waters and the breakdown of the urban water cycle. Inhabitant water misuse and overconsumption is overwhelming aging municipal utilities, resulting in the decay of urban water quality. LEEDTM and The Living Building Challenge are recognized Green Building Guidelines prescribing sustainable site and building water standards. Case Studies of domestic Green Building projects will showcase water conservation to enable domestic water renewal. Net Zero Water Guidelines based on the Green Building Guidelines outline Potable and Non-Potable water use to achieve a sustainable volume of water demand at 70 litres per capita per day. Sustainable water practices are encouraged by utilizing domestic building systems to increase water value and water awareness. Time-of-Use and Choice-of-Use exposure for household water related tasks establish water savings through the use of best-performing water fixtures and appliances. Net Positive Water Guidelines will establish On-site and Building standards for sustainable harvesting and storage of water resources. Clean and Dirty water management will prescribe Passive design and Active mechanical processes to maintain best-available water quality in the urban domestic environment. Net Positive Water building typology will integrate urban inhabitation as a functional component of the urban water cycle to use, reuse, and renew water resources. The method will be tested using a Mid-rise Pilot project to deploy the necessary Passive and Active mechanisms to generate Net Positive Water quality through Net Zero Water sustainable water use. The pilot project is situated in Waterfront Toronto - The Lower Don Lands development to harness regional interests for water renewal and environmental revitalization.
283

Net Positive Water

Ma, Billy January 2013 (has links)
‘Net Positive Water’ explores the capability of domestic architecture to combat the developing urban water problem. Urban intensification is contributing to the volatility of urban waters and the breakdown of the urban water cycle. Inhabitant water misuse and overconsumption is overwhelming aging municipal utilities, resulting in the decay of urban water quality. LEEDTM and The Living Building Challenge are recognized Green Building Guidelines prescribing sustainable site and building water standards. Case Studies of domestic Green Building projects will showcase water conservation to enable domestic water renewal. Net Zero Water Guidelines based on the Green Building Guidelines outline Potable and Non-Potable water use to achieve a sustainable volume of water demand at 70 litres per capita per day. Sustainable water practices are encouraged by utilizing domestic building systems to increase water value and water awareness. Time-of-Use and Choice-of-Use exposure for household water related tasks establish water savings through the use of best-performing water fixtures and appliances. Net Positive Water Guidelines will establish On-site and Building standards for sustainable harvesting and storage of water resources. Clean and Dirty water management will prescribe Passive design and Active mechanical processes to maintain best-available water quality in the urban domestic environment. Net Positive Water building typology will integrate urban inhabitation as a functional component of the urban water cycle to use, reuse, and renew water resources. The method will be tested using a Mid-rise Pilot project to deploy the necessary Passive and Active mechanisms to generate Net Positive Water quality through Net Zero Water sustainable water use. The pilot project is situated in Waterfront Toronto - The Lower Don Lands development to harness regional interests for water renewal and environmental revitalization.
284

Příprava realizace dostavby klinické hematologie FN Brno / Preparation of realization of completion of clinical hematology, University Hospital Brno

Průcha, Aleš January 2020 (has links)
The aim of this diploma thesis is a solution of the extension of clinical hematology of the Faculty Hospital Brno. The thesis deals with the technological regulation for steel construction, coupled ceiling concrete slab with other topics including an inspection-check plan, a time schedule for carcass, time and financial schedule for structures and an item budget. In addition, this work includes the coordination site-layout of the construction with wider transport relations, mechanical assembly, the principles of the organization of site equipment and occupational safety and health risks. Finally this thesis contains several assessments for cranes, scheme of principles of fixing steel columns into structure, scheme of laying building envelope, LEED, site equipment financial assessment.
285

Investigation of the growth process of thin iron oxide films: Analysis of X-ray Photoemission Spectra by Charge Transfer Multiplet calculations

Suendorf, Martin 19 December 2012 (has links)
Thin metallic films with magnetic properties like magnetite are an interesting material in current technological applications. In the presented work the iron oxide films are grown by molecular beam epitaxy on MgO(001) substrates at temperatures between room temperature and 600K. The film and surface structure are investigated by x-ray reflectometry (XRR), x-ray diffraction (XRD) and low energy electron diffraction (LEED). The chemical properties are investigated by x-ray photoelectron spectroscopy (XPS). Furthermore, charge transfer multiplet (CTM) calculations are performed as a means to gain additional information from photoemission spectra. It is shown that only for temperatures higher than 500K the oxide film forms a spinel structure. A previously unobserved (2x1) surface reconstruction in two orthogonal domains is found for various preparation conditions. The application of CTMs results in good quantitative and qualitative agreement to other methods for the determination of the film stoichiometry. In addition CTMs can well describe the segregation of Mg atoms into the oxide film either during film growth or during film annealing. It is found that initially Mg substitutes Fe on all possible lattice sites, only for prolonged treatment at high temperature do Mg atoms favour the octahedral lattice sites of divalent Fe.
286

Stavebně technologický projekt výrobní haly v Sudoměřicích / Construction technological project of the production hall in Sudoměřice

Kolacia, Tomáš January 2022 (has links)
The subject of the diploma thesis is construction-technological solution for realization of the production hall with administrative part in Sudoměřice. Parts of the thesis are the technical report for the construction-technological project, a study of the realization of the main technological stages of the building, the solution of the wider transport route links, where I designed and assessed selected transport routes. The other parts of the diploma thesis are design of a site equipment with the technical report of the site equipment, design of the main building machines and mechanisms. The time and financial plans of objects are elaborated, followed by the detail time schedule of the realization of the main building obejct with a workers needs diagram and the item budget of the main building object with the bill of quantities. For the proces of the realization of the reiforced concrete prefabricated construction, the technological regulation for the assembly of elements with usability of the mobile crane, was made. In the diploma thesis, the technological regulation for the reiforced concrete cast-in-place columns and bond beams, was also prepared. Due to the high demands on the quality of the construction, the control and test plans for the assembly of the reiforced concrete prefabricated elements and for the cast-in-place columns and bond beams, were also prepared. Within the environmental protection, the requirements for the certification LEED 2009 Core & Shell, were processed.
287

Realizace výstavby Hotelu Karpaty ve Valašských Kloboukách / Construction of the Hotel Karpaty in Valašské Klobouky

Šánek, Adam January 2022 (has links)
The subject of my diploma thesis is the solution of the construction of the Hotel Karpaty located near the town of Valašské Klobouky. The thesis contains an accompanying technical report, solution of transport routes, including traffic situation, time and financial plan of construction, study of implementation of main technological stages, construction site project with division into individual stages, drawing part and construction site report, design of main working machines and mechanisms, time hotel construction plan, plan for securing material resources, including budget and staff needs chart, technological regulation of monolithic ceiling structures, control and test plan for monolithic ceiling structures, design and installation of Schüco aluminum windows, design of construction measures Hotel Karpaty according to LEED standard.
288

Stavebně technologický projekt montované haly v Pardubicích / CONSTRUCTION TECHNOLOGICAL PROJECT OF PREFABRICATED HALL IN PARDUBICE

Švub, Daniel Unknown Date (has links)
Diploma thesis deals with construction-technological project of prefabricated steel hall. I put emphasis on technological process of foundation structures. The time schedule of all processes, the cost estimation budget, the inspection and testing plan and the machine set designing are also contained. The building site equipment for excavation and rough superstructure and the coordination plan drawing with transportation roads is designed.

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