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This project has designed a material treatment process to extend the lifespan of extrusion augers used by the social enterprise Appropriate Energy Saving Technologies (AEST) in Uganda. AEST uses an extruder machine to recycle agricultural waste into charcoal briquettes that they sell to low-income families. The auger components wore down quickly and needed a hardening process to remain useful for...
Lightning is one of the most unpredictable and destructive forces in nature, and ensuring the protection and safety of aircraft in flight, as well as other modes of airborne transport, when struck by lightning presents a unique set of engineering challenges. In order to progress into a new generation of conductive carbon composites and/or embedded light-weight lightning protection systems, further...
The immobilization of DNA on different solid supports has become an important issue in different fields ranging from medicine to analytical chemistry and, more recently, molecular electronics. Among the different immobilization procedures, adsorption is the simplest and the easiest to automate, avoiding the use of procedures based on previous activation/modification of the substrate and subsequent...
Active thermographic studies using non stationary coded thermal wave imaging methods facilitate deeper sub surface analysis with better depth resolution even with relatively low peak powers. They exhibit a variation in detection capability due to their diversity in shape and frequency content etc., In order to compare the ability of these schemes in spite of their diversity, a common feature based...
Localized deposition of pure platinum nanostructures was achieved using a combination of focused electron beam induced processing (FEBID) of an inorganic platinum precursor and low temperature annealing in water vapour. This technique enables fabrication of Pt nanostructures with high spatial resolution and purity, for applications in nanoelectronics, sensing devices and catalysis.
Materials with nonlinear conductivity is sometimes used as field grading materials in high voltage applications. With respect to this, the electrical conductive properties of composites containing polyaniline (PAni) and carbon black (CB) as electroactive fillers have been studied with respect to the filler/matrix ratio, type of matrix material and how the composites were processed. Flat pads were...
Microwave impedance microscopy (MIM) is a novel scanning probe technique used to measure local electrical impedance under an AFM tip operating at some fixed electrical resonant frequency. Each point in the surface scan records sample elevation and power return loss, thus generating a topographical image with an overlaid impedance map. Various high specific surface area (SSA) carbon materials, recently...
This paper details the design and characterization of a biomimetic flapping actuator inspired by fin-rays of fishes. The flapper design consists of two carbon fiber beams with a thin viscoelastic material sandwiched between them. When the beams are actuated to move relative to each other tangentially, the entire assembly curves out of the plane of symmetry creating a flapping motion. A model for the...
Carbon/carbon composite materials has superior performance in underwater corrosion resistance, high temperature resistance and high abrasion resistance that promises to be a new applied materials in the water turbine seal ring. But in turbine abnormal vibrations occur during operation, resulting in carbon/carbon composite material fracture. In this paper, four kinds of adhesive materials consisting...
An unmanned vehicle is being developed for highspeed aerial ingress to a target shallow water environment after which it will transition to underwater low-speed operations. This paper describes the design and analysis of a bio-inspired robotic fin for use as an underwater propulsion and control mechanism, and the effect this fin has on the aerodynamic characteristics of the air-deployed vehicle platform...
In this paper we study the thermoelectric (TE) properties of graphene nano-ribbons (GNRs) with incorporated nanopores (NPs), and present a nanopore-engineering approach for enhancing their TE properties. The nearest neighbor tight binding (TB) model and Non equilibrium Green's function (NEGF) method were employed to obtain the electron transmission spectra. For phonon calculations, Tersoff potential...
The impact of carbon fiber composites (CFC) as a ground plane material on antenna performance is investigated. CFC are lighweight materials that, due to their high mechanical durability, are increasingly used as chassis material for cars. Their electrical characteristics are anisotropic and dependent on the manufactured structure, which is expected to in uence the radiation pattern. Simple monopole...
The welding quality in the form of nugget diameter and the tensile strength of resistance spot welding in low carbon steel was experimentally investigated. Two types of low carbon steel; the uncoated plate of SPC 270D and the coated plate of SCGA 270D with the same thickness of 0.7 mm were used and studied in this experiment. The process determination of optimal welding conditions was done based on...
At the present time getting planar cathodes with good field emission properties and big surface area is one of the most actual tasks in field emission. This goal could be achieved by using carbon-contained powders. In this work are shown the comparative characteristics of carbon powders made by various methods.
Currently, a variety of Thermal Interface Materials (TIMs) are required to meet specific requirements for various products with no single TIM meeting the needs for all CPU market segments. Surface treatments, reflow temperatures, mechanical load, performance targets all play a role in choosing a specific TIM. Based on the above multitude of conditions, it is desirable to find a universal TIM that...
In order to improve delivery of therapeutic agents, better delivery systems are required. However, many drug delivery platforms have been developed based on a trial and error approach. Systematic study of factors affecting nanomaterial internalization within cells is lacking. Several drug carriers including liposomes and polymeric microspheres have been proposed in the past. Furthermore, unmet needs...
LiFePO4/C nanoparticles were synthesized by solid state reaction and controlled cooling rates. LiFePO4/C samples showed olivine phase irrespective of the cooling rate. However, the average particle sizes significantly changed with the cooling rate; the particle size was 200 nm when prepared by slow cooling (10°C/min) and 120 nm by fast cooling (air quenching). Assembled coin cells exhibited first...
Sustainable and environmental, is the clarion call for 21st Century and a challenge to our consumption led lifestyles. Therein lies a conflict, on one hand environmentalism on the other emergence from the economic doldrums, the later predicated on consumer confidence and increased sales. In response we placate our eco-consciences purchasing ‘green products’ in ‘eco-stores’. This research will suggest...
A simple electrochemical deposition method is introduced for the preparation of a hierarchical nanostructure comprised of graphene and carbon spheres. The carbon spheres are used as nano-spacers to separate graphene nanosheets, improving properties. This method allowed for the one-step preparation of a fibrous, flexible supercapacitor electrode. The fibrous, flexible supercapacitors fabricated based...
Combining magnetic catalysis effect, surface plasmon resonance phenomena, and common-path heterodyne interferometry, a highly sensitive and highly stable carbon monoxide sensing technique was proposed in this paper. Magnetic catalysis material SnO2-Fe3O4 was prepared and was spin coated on the gold film of SPR prism. The SPR apparatus can provide a highly sensitive ability to carbon monoxide. Carbon...
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