Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 83 for “"Thermal behaviour"”.
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Transient boiler heat exchanger thermal behaviour analysis
… aging. The main aging mechanisms are creep and thermal fatigue. Creep results from the high temperatures at which the components operate. Thermal fatigue is due to thermal stresses and these stresses result from temperature gradients within the material. Cycling of these thermal stresses …
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Understanding correlations between secondary relaxations and thermal behaviour of biologically relevant molecules
… this doctoral thesis examines the application of thermally stimulated depolarisation current (TSDC) spectroscopy as a probe of molecular mobility in the solid (powdered) state. TSDC spectroscopy has proved useful in understanding the molecular mobility of amorphous materials. However, few …
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NUMERICAL, ANALYTICAL AND EXPERIMENTAL STUDY OF THE THERMAL BEHAVIOUR OF INNOVATIVE ENERGY GEOSTRUCTURES
… to advance understanding and knowledge of the thermal behaviour of innovative Energy Geostruc- tures (EGs), which serve a dual purpose: providing structural stability and supporting buildings or soil while harnessing geothermal energy for the heating and/or cooling demands of buildings. Two …
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The thermal behaviour and isothermal crystallisation of cyclic poly(butylene terephthalate)and its blends
This thesis concerns the thermal behaviour and isothermal crystallisation kinetics study of cyclic polyesters and its blends, in particular cyclic poly (butylene terephthalate) (c-PBT). The production of c-PBT is interesting; in fact it is different from production of conventional linear PBT since …
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Experimental Investigation of the Heat Source Orientation on the Transient Flow and Thermal Behaviour of Phase Change Material During Phase Transition
… characterization of transient flow and transient thermal behavior of phase change material (PCM) during solid-liquid phase change (melting) through experimental investigation. Two specific aspects of the current work, both important in the field of latent heat thermal energy storage, are to …
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Evaluation of the effect of urbanization on urban thermal behaviour using urban heat island indicators: the case of the CBD of Accra.
… the effect of urbanization on the urban thermal behaviour in the CBD of Accra, with the view to developing suitable proposals that can influence current and future strategic urban design decisions meant to mitigate the negative impacts of UHI in the city. This study employs an explanatory …
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Multi-scale modelling describing thermal behaviour of polymeric materials. Scalable lattice-Boltzmann models based upon the theory of Grmela towards refined thermal performance prediction of polymeric materials at micro and nano scales.
Micrometer injection moulding is a type of moulding in which moulds have geometrical design features on a micrometer scale that must be transferred to the geometry of the produced part. The difficulties encountered due to very high shear and rapid heat transfer of these systems has motivated this …
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Mejora del comportamiento térmico de los morteros de cal aditivados y su empleo en la rehabilitación de inmuebles = Improvement of thermal behaviour of additived lime mortars and their use in rehabilitation of buildings
… the need for intervention. However, its high thermal inertia and fluctuation of temperatures in the majority of Spain bring up that it should be placed outside the insulation. In this regard, the lack of availability of enough thickness to implement systems such as ETICS results in that often …
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Physicochemical study of inclusion of drug molecules in cyclodextrins
… of the chemical composition, iii.) analysis of thermal behaviour and iv.) investigation of the solid state features of the complexes. Ultraviolet spectrophotometry, elemental analysis and thermogravimetric analysis were the principal techniques used for determination of composition. Hot stage …
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Development of an ‘artificial human’ for clothing research
… body, and hence, has the primary im-pact on thermal comfort, physiological response of the human body and environmental strain. On the other hand, the clothing microenvironment is affected by physiological reactions (sweating, temperature distribution, body movement). Nowadays, thermal …
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Crystal engineering of novel organic-inorganic compounds of N- and O-donor dipyridyl ligands
… were characterised by x-ray diffractometry. Thermal analysis (thermogravimetry (TG), differential scanning calorimetry (DSC) and hot stage microscopy (HSM)) was used to determine the thermal behaviour of these compounds. Microanalysis was used to confirm elemental composition.
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Internal and atmospheric structures of heated watery super-Earths
… their interiors. Such models often exclude any thermal effects, a choice justified by noting that a heated rocky planet expands by only a small amount. But this is not necessarily true for planets with thick oceans or watery atmospheres. Water has a rich and interesting thermal behaviour: at …
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Heat induced denaturation of fibrous hard alpha-keratins and their reaction with various chemical reagents
This dissertation is concerned with the thermal behaviour of fibrous proteins encapsulated in rigid structures, among the most well-known representatives of this class being the alpha-keratins in human hair. In spite of a lot of work in the field, there is still no mechanism proposed for accounting …
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Three dimensional thermal modelling of high temperature proton exchange membrane fuel cells in a serpentine design
… FLUENT. The focus of my work is to study the thermal distribution within this segment. The results of the work aid in a better understanding of the fuel cell operation in this temperature range. At the time of my investigation experimental results were unavailable for validation and therefore …
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Modélisation simplifiée du comportement thermique d'un bâtiment et vérification expériementale
… functions of the walls) aimed to simulate the thermal behaviour are too complex and computer time consuming compared to the accuracy of the needed data they require and the assumptions generally made. By an electrical analogy, a model whose order is lower than 4 is first proposed to model the …
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The Effect of Framework Structure and Chemical Functionality on Melting in Zeolitic Imidazolate Frameworks
… were found to be essential for melting, the thermal behaviour of ZIFs displaying ultra-high framework densities, specifically those exhibiting the zni network topology, were investigated. Melting in these ZIFs was found to occur at higher temperatures than in cag topology systems. …
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The synthesis, reactivity and application of functionalized alkyl transition metal complexes
… and new information on electrochemical and thermal behaviour of (CpFe(C0)2{(CH2) 6Br}] has been obtained from cyclic voltammetry and differential scanning calorimetry respectively. The chemical reactivity of (CpFe(C0)2{(CH2) 0Br}] with various reagents including NaOMe, a cobaloxime anion, …
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Studies on the thermal decomposition behaviour, kinetics and electrical conductivity of the non-isothermal decomposition of pyridine mono carboxylic acids and some of their transition metal complexes
… diffraction, and mass spectra. Additionally, the thermal behaviour of free ligands in air has been studied by means of thermogravimetry (TG), derivative thermogravimetry (DTG), and differential scanning calorimetry (DSC) measurements. The behaviour of thermal decomposition of the three free …
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The co-crystallisation of sugars by the supersaturation process
… allowed information to be obtained on the thermal behaviour of the various co-crystalline materials, whilst PXRD permitted information on the structural aspects of the materials to be gained. These two forms of analysis were complimentary to each other, each revealed unique characteristics …
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Reconstruction of milk fat globules/membrane (MFGs/MFGM) and characterization of its physicochemical properties and techno-functionalities
… (pH 6.30 and 5.30, 25℃), and novel non-thermal treatment, ultrasonic treatments with different intensities. Additionally, anionic polysaccharide- high-methoxyl pectin (HMP) was incorporated to the raw milk before the cream separation, examining the resulting physicochemical properties …
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