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Showing 1 to 20 of 78 for “"Waxes"”.
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Solidification properties of certain waxes and paraffins
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Oxidation of waxes using microwave-generated singlet molecular oxygen
Waxes are a widely used chemical commodity throughout the world due to certain intrinsic properties. Applications vary widely, including such obvious ones as candles and polishes, less obviously coatings, ink, and cosmetics, and more obscurely, hot melt adhesives, textile processing and chewing …
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Models for the hydrocracking of Fischer-Tropsch derived waxes
Includes synopsis.
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Studies on the composition of thermally oxidised Fischer-Tropsch waxes
A composition of thermally oxidised Fischer-Tropsch hard wax was proposed based on a study ofthe oxidation products of model compounds, n-Cl6, n-C24 and n-C32. The model compound oxidation yielded isomers of alcohols and ketones with carbon numbers ranging from 2 to the same carbon number as that …
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Analysis of heavy paraffinic Fischer-Tropsch waxes using gel permeation chromatography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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The origin of multiple DSC melting peaks of Fischer-Tropsch hard waxes
… (DSC) analyses of the Fischer-Tropsch (FT) hard waxes display multiple melting peaks, the origin of which is unknown. The phenomenon is sometimes referred to in the literature, but no attempt has been made to explain its cause. There are a few known causes of melting bimodality in n-alkanes and …
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Fundamental behaviour and micronisation of Fischer-Tropsch waxes via supercritical CO2 PGSS processing
… the PGSS micronisation of Fischer-Tropsch (FT) waxes via sc-CO₂. The primary aim of this project was to assess the viability of sc-CO₂ PGSS micronisation of FT waxes, and to obtain an in-depth understanding of the interdependencies between PGSS processing conditions (temperature, pressure, …
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Settlement of marine fouling organisms in response to novel antifouling coatings
… Here I explored the utility of petroleum waxes as novel antifouling/foul-release coatings. I first investigated the responses of propagules (larvae or spores) of six common fouling organisms to wax coatings in the laboratory. A wide variation in the response of these different organisms, …
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I. The Evaluation of Urea Adduct Fractionation of Waxes by X-Ray and Electron Diffraction and Other Techniques. Ii. The Structure of Metal Films on Glass Fibbils
Made available in DSpace on 2015-05-12T17:02:31Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0009061.PDF: 5866288 bytes, checksum: 93ac0c228a8412b04d13867f0c55d763 (MD5) Previous issue date: 1954
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Structure, distribution and innervation of sensilla on the ovipositor of the spruce budworm Choristoneura fumiferana, and electrophysiological reponses from type II sensilla
… encouraged to oviposit in the presence of host waxes whereas virgins are not. The response of Type II hairs to waxes in solution from their most preferred host, white spruce (Picea glauca), revealed no differences between unmated and mated insects. Mated and unmated females' sensilla responded …
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Hydrophobization of Cellulose-Based Fibers for Packaging Applications with Alkyl Ketene Dimers (AKD) and Food-Grade Waxes via Supercritical Impregnation with Carbon Dioxide – Experimental and Thermodynamic Modeling Approaches
This modified material has applications in food packaging, where frequently water-repellant surfaces are required. This method is preferable to traditional coating methods because it sizes across the entire thickness of the substrate rather than just the surface and can be used for non-planar …
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Montan wax from California lignites
… in the rubber industry, The increased demand for waxes for industrial uses and the limited supply of domestic origin has made the study of the sources and characteristics of domestic waxes desirable, California lignite has been shown to be a valuable source of Montan wax, The object of this …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΟΡΙΣΜΕΝΩΝ ΦΥΣΙΚΩΝ ΙΔΙΟΤΗΤΩΝ ΤΩΝ ΚΕΡΙΩΝ ΟΔΟΝΤΟΣΤΟΙΧΙΩΝ
… OF THE CHANGES IN SHAPE OF DENTAL MODELLING WAXES AFTER THEIR MANIPULATION IN VARIOUS TEMPERATURES IS CONDUCTED. THE POSSIBILITY OF CORRELATING THESE CHANGES TO THE PROPERTIES OF FLOW AND LINEAR THERMAL EXPANSION, WHICH WERE CALCULATED EXPERIMENTALLY WITHIN THE SAME TEMPERATURE RANGE, IS ALSO …
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An assessment of stingless beeswax as a pattern material in ancient Mesoamerican lost-wax casting
… used to form the models for lost-wax casting. Waxes from Mexican stingless bees Melipona beecheii, Scaptotrigona pectoralis, and Melipona yucatanica were considered in this study, in addition to three copals: Bursera copallifera, Protium copal, and Pinus contorta. Thermal data from Differential …
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Fossil C 4 plant signals in Southeast Atlantic Ocean continental margin sediments indicate climate-dependent vegetation changes on the adjacent continent
… the predominance of C4 or C3 land plants. Leaf waxes of 35 C4 grasses and three C3 grasses were analysed. These investigations revealed that C4 grass waxes have significantly higher compound-specific delta13C values, high contents of n-C31 and n-C33 alkanes and the abundance of the n-C32 …
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The effect of metal type and loading on n-paraffin hydrocracking conversion and selectivity
… Synthesis. Long-chain hydrocarbon waxes are produced and these are subsequently hydrocracked into the required middle distillate fuels, preferably diesel, as diesel engines are more efficient than their petrol counterparts. Hydrocracking may be carried out using a bifunctional …
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Dynamics and rheology of soft phase-change materials
… and gas industry, where formation of paraffin waxes and clathrate hydrates represent major issues for upstream production and flow assurance.
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… past 20,000 years. Radiocarbon dating of leaf waxes in Cariaco Basin and Lake Titicaca sediment records indicates that waxes preserved in sediments are likely composed of a fresh component transported to sediments within decades of production by vegetation and an old component derived from aged …
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