ABSTRACT Surge and swab pressure computation is very important in drilling hydraulics. Most blowout problem in oil wells have been as a result of surge and swab pressures developed from running or pulling of tubular goods in liquid-filled bore hole. Excessive surge pressures can fracture the geological formation, while excessive swab can result in blowouts. In this work the analysis of steady state, laminar couette flow of non-Newtonian yield power law drilling fluid model (Herschel-Bulkley)...
ABSTRACT Appropriate selection of rheological models is important for hydraulic calculations of pressure loss prediction and hole cleaning efficiency of drilling fluids. Power law, Bingham-Plastic HerschelBulkley models are the conventional fluid models used in the oilfield. However, there are other models that have been proposed in literature which are under / or not utilized in the petroleum industry. The primary objective of this study is to recommend a rheological model that best-fits th...
ABSTRACT This study examines the basic operation of an Organic Light Emitting Device (OLED) and Hybrid Organic-Inorganic Light Emitting Devices (HOILED) by looking at the individual characteristics of the each layer which makes up the entire device. Adhesion analysis and different types of layer characterization were carried out. First of all, the material of interest was deposited on AFM tips, clean 1 sq. inch glass substrates and ITO-coated glass with subsequent final fabrication of the de...
ABSTRACT Techniques in Geostatistics are increasingly being used to generate reservoir models and quantify uncertainty in reservoir properties. This is achieved through the construction of multiple realizations to capture the physically significant features in the reservoir. However, only a limited number of these realizations are required for complex fluid flow simulation to predict reservoir future performance. Therefore, there is the need to adequately rank and select a few of the realiza...
Abstract Current standard of care treatment modalities for early-stage breast cancer typically involve mastectomy or lumpectomy followed by radiation therapy to remove any residual cancer cells. Although mastectomy has a low recurrence rate, it is an aggressive form of treatment for early-stage breast cancer. Therefore, there is a need for the development of new strategies that could increase the use of lumpectomy by eliminating residual cancer cells to reduce local recurrence with limited s...
ABSTRACT The effect of liquid flow rate, pipe size (diameter) and pipe orientation (inclination) on liquid hold-up was investigated. Liquid flow rate between 500 STB/day and 5000 STB/day was studied. An oil of 25˚API at an average temperature of 175˚F, a gas gravity of 0.65, water cut of 25% with water gravity of 1.07 and containing no free gas was used in this study. The correlations given by Standing, Culberson and Maketta, Vasquez, Dodson and Standing, Papay, Beggs and Robinson, and Lee...
ABSTRACT Conversion of lignocellulosic biomass from bamboo (Bambusa vulgaris) to butanol is an important alternative energy source. In this work, bamboo was used as biomass feedstock for the production of butanol by the fermentation of sugars. Mechanical grinding was carried out, followed by pre-treatment with dilute sulfuric acid concentration of 0.5 and 1.0 (%v/v). This was done at temperatures of 25, 110, 120, 150 and 2000C at time intervals of 2 and 4 hours. Prehydrolysate was later anal...
ABSTRACT The use of Magnesium oxide (MgO) cement as a full replacement and viable alternative for Ordinary Portland Cement was studied. Rice husk, an agricultural waste, was calcined and synthesised to be used as a source of silica and a pozzolan in the production of this cement. Rice husk ash (RHA) of various particle sizes (45, 106 and 150 μms) was used and varying dosages of superplasticiser were also used to alter the water to cement (w/c) ratio of the cement. The MgO/SiO2 ratio at 60% ...
ABSTRACT The Luteinizing Hormone-releasing Hormone (LHRH); also known as a GonadotropinReleasing Hormone can be utilized for targeted therapy with cytotoxic analogs, in which prodigiosin is linked to the [D-Lys6] LHRH. Our studies demonstrate receptor-mediated actions of the cytotoxic LHRH analog in LHRH receptor positive breast cancer cells. Chemotherapy today is the only systematic therapy for patients with triple negative breast cancer cells. About 50% to 64% of human breast cancer expres...
ABSTRACT In the past years, several researches have been done on gas-condensate reservoir recovery performance using fully compositional simulators. Fully compositional simulators are more expensive, time consuming and have complex data requirement as compared to limited compositional reservoir simulators. An alternative method of evaluating gas condensate reservoir recovery has been considered in this research; it is four-component limited compositional reservoir simulator. The limited comp...
ABSTRACT Wellbore instabilities are responsible for 10-20% of the total drilling cost. It has been estimated that wellbore instability causes an annual economic loss of US$ 500 - 1000 million in the oil industry across the world. Hence, the maintenance of wellbore stability is of major concern to drilling engineers in the oil and gas industry. Hence, several models have been developed for the assessment or prediction of wellbore instabilities. However, these models do have some limitations. ...
ABSTRACT This study presents the results of a combined experimental and theoretical study of the strength, fracture toughness and interfacial properties of natural fiber-reinforced earth-based composite materials. The composites, which consist of mixtures of laterite, clay and straw, are stabilized with controlled levels of Portland cement. The compositional dependence of compressive, flexural/bend strength and fracture toughness are explored for different proportions of the constituent mate...
ABSTRACT This paper presents the use of multilayered chitosan films incorporated with antimicrobial agent, potassium sorbate to enhance effective food packaging. In this study, potassium sorbate was incorporated into multilayer chitosan films for antimicrobial food packaging applications. The effectiveness of the films was tested through measurement of release kinetics and antimicrobial activity on a selected microorganism, Aspergillus niger. All the films prepared with potassium sorbate sho...
ABSTRACT Chemical and physical methods for the synthesis of magnetic nanoparticles for cancer detection and treatment often involve toxic chemicals, high cost and the formation of non-stable nanoparticles. This prompted the development of fundamental understanding of the synthesis of magnetic nanoparticles, which are biocompatible, cost effective, stable, localized and environmentally friendly in the presence of magnetotactic bacteria. In this work, fundamental understanding of the underlyin...
Abstract This dissertation shows the use of material science and engineering approaches in developing solutions to problems in the life science with focus in nano and micro-particles for the detection and treatment of cancer. It presents the results of experimental and theoretical studies of magnetite, gold nanoparticles and injectable multi-functional biodegradable polymer-loaded microparticles. Biocompatible magnetite nanoparticles (BMNPs) were produced from Magnetospirillum magneticum (M....