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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 48 for “"Microwave Irradiation"”.
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Rock differentiation using microwave irradiation
… on a rock by rock basis. Experimentation with a microwave oven indicated that samples of kimberlite were more attenuative than samples of gabbro. The possibility of using microwave heating for rock differentiation was investigated but was impractical to implement. A study of low power microwave …
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Ore sorting using microwave irradiation
… between gabbro and kimberlite. A technique using microwave irradiation attenuation was successful when using parallel-sided smooth-surfaced rocks. This technique used linearly polarized square antennas at 35GHz. Problems were experienced, however, with irregu1arly shaped rock s. The aim of the …
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Optimizing Weed Management via Microwave Irradiation
… to chemical weed control is the use of microwave radiation, a particular form of indirect thermal weeding. Absorption of microwave radiation causes water molecules within the tissue to oscillate, thereby converting electromagnetic energy into heat. This technique is rapid, versatile and …
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Effects of Microwave Irradiation on the Dimensional Stability of Complete Denture Bases
… It has been determined that two minutes of microwave irradiation at 650 Watts provides denture disinfection, and three minutes provide sterilization32,34. There is insufficient data on how this practice affects the long term dimensional stability of commonly used complete denture bases in …
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Investigation of the effect of microwave irradiation (2.45 GHz) on biological systems at constant bulk temperature
In this thesis the effect of MW irradiation (2.45 GHz) at constant bulk temperature was investigated on several biological systems. Studies on enzymatic activity revealed that MW irradiation could enhance the activity of trypsin, however the enzymatic activity of α-amylase and alkaline phosphatase …
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A comparison of conventional heating techniques and microwave irradiation for the desorption of lithium borohydride and lithium borohydride composites
… using both conventional heating techniques and microwave irradiation. LiBH4 was milled with TiH2 in various molar ratios in an argon atmosphere using both roller and planetary mill techniques. Thermo-gravimetric analysis and differential scanning calorimetry determined the desorption …
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Analysis of cellular responses to microwave irradiation in E. coli and change of oxygen level and culture medium in human cancer cell lines using RNA-seq based transcriptomic profiling
… change in E. coli cells after exposure to microwave irradiation (MWI) and in cancer cell lines in response to different culture conditions using breast cancer cell lines (MCF7) and prostate cancer cell lines (PC3) as the models. Our results in examining the gene expression change in E. coli …
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Microwave effects on some zeolite catalysed reactions
… the literature which refers to the advantages of microwave irradiation as opposed to normal conventional heating. Many of the reports claim that activation by microwave radiation results in enhanced rates and changes in product selectivities. Of special interest were reports that microwave …
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EFFECT OF GENOTYPES, TANNIN LEVEL AND PROCESSING METHODS ON THE PHYSICOCHEMICAL, NUTRITIONAL AND STRUCTURAL CHARACTERISTICS OF FABA BEAN GROWN IN WESTERN CANADA
… three treatments (Control, Steam Pressure and Microwave Irradiation). Significance in all studies was declared at P < 0.05 with tendency at P ≤ 0.10. In Study 1, the results of chemical profiles showed no significant differences in total protein (CP) and total carbohydrates (CHO) contents among …
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One-Dimensional nanostructured polymeric materials for solar cell applications
… and flower-like morphology was also prepared by microwave irradiation and used as electron acceptors in photovoltaics devices. The morphological, structural, spectroscopic and electrochemical characteristics of these materials were determined by scanning electron microscopy (SEM), X-Ray …
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Synthesis and characterisation of pillared clay catalysts for hydro-cracking of heavy liquid fuels
… both conventional ion exchange techniques and microwave enhanced methods to improve performance and/or reduce preparation time. These catalytic materials were characterised in detail both before and after use in order to study the effect of the preparation parameters (starting material, …
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The preparation of heterocycles by [2+2+2] cyclization and inverse electron demand Dels-Alder reactions of arynes with 1,2,4-triazines
… were achieved with cobalt(I) catalysts under microwave irradiation in chlorobenzene, producing the desired pyridazines in moderate to good yields. This success led to the preparation of a series of annulated pyridazines. The use of two tethering nitrogens in the preparation of the cyclization …
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A Numerical Model for Thermal Effects in a Microwave Irradiated Catalyst Bed
… particles attached to a ceramic support through microwave irradiation. This analysis is incorporated into a macroscopic heat transfer model of a packed and fluidized catalyst bed heated by a microwave field to predict thermal effects associated with selective heating of the catalyst sites. The …
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Sensitivity-enhanced nuclear magnetic resonance of biological solids
… nuclei. The polarization transfer is driven by microwave irradiation near the electron Larmor frequency. Signal enhancements of up to approx. 185 at 5 Tesla have previously been reported using a nitroxide radical in water/glycerol and a high-power gyrotron as a microwave source. This thesis …
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High field dynamic nuclear polarization methods: Microwave sources and mechanisms
… these advances have come with continuous-wave microwave irradiation and the introduction of nitroxide-based biradicals exploiting the cross effect mechanism. In this thesis, I argue that this approach is not necessarily optimal and report progress towards arbitrary-waveform DNP, in the …
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Dynamic nuclear polarization for NMR : applications and hardware development
… to nuclei. Driving this transfer requires irradiation with high power microwaves which are generated with gyrotrons oscillators. We describe a series of modifications are made to an existing 140 GHz gyrotron allows for continuous wave operation and higher power and greater stability. DNP …
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I. Microwave-Influenced Diversity-Oriented Synthesis Of Biologically Relevant Small & Natural-Product-Like Molecules Via Multicomponent Coupling Reactions Ii. Synthetic Studies Toward The Total Synthesis Of The Repeating Tetrasaccharide Unit Of Zwitterionic Polysaccharide Ps A1
<p>Microwave-influenced diversity-oriented synthesis of biologically relevant small and natural-product-like molecules via multicomponent coupling reactions (MCCRs) have been investigated. Cheap, readily available starting materials in conjunction of microwave irradiation and employment of …
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Dynamic nuclear polarization of biological systems at high magnetic fields
… experiments at 5 Tesla require high-power microwave irradiation at or near the EPR frequency. To that end, a cyclotron resonance maser, or gyrotron, is described. This 140 GHz gyrotron, which under conventional operation produces millisecond pulses, has been adapted to operate at -100 W in …
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Synthetic and mechanistic aspects of the reactions of α-diazosulfoxides
… catalysed, photochemical, thermal and microwave) with a particular emphasis on the reactive intermediates and mechanistic aspects of the reaction pathways involved. In agreement with previous studies carried out on these compounds, the key reaction pathway of α-diazosulfoxides was found …
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Mechanism and the Effect of Microwave-Carbon Nanotube Interaction
… about unusual heating of carbon nanotubes by microwaves is analyzed in this dissertation. Two of vibration types, cantilever type (one end is fixed and the other one end is free), the second type is both ends are fixed, have been studied by other people. A third type of forced vibration of …
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