Materials Literature
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Quantum Tunnelling Composites (QTC) have attractive mechanical-electrical properties and have found applications in a number of advanced technologies such as the touch-sensitive finger-tips on the gloves of the NASA space suits. There was a demand to apply QTC materials to consumer products such as credit cards, via a…
Cardiovascular disease is the highest cause of morbidity worldwide, encompassing blood vessel disorders such as coronary artery and peripheral arterial disease. For small diameter applications (less than 6 mm) a tissue engineered commercial product is yet to be produced. Previously, a process for the production of ace…
Composite materials have a complex behavior, which is difficult to predict under different types of loads. In the course of this dissertation a methodology was developed to predict failure and damage propagation of composite material specimens. This methodology uses finite element numerical models created with Ansys a…
A thesis submitted in partial fulfillment of the requirements for the award of the Degree of Masters of Science (Electronics and Instrumentation) in the school of Pure And Applied Sciences of Kenyatta University, September 2015
This thesis is concerned with the self-organization of molecules that have disc-like shapes. The disc-like molecules may have relatively rigid structures as in polyaromatic systems, or they may have amphiphilic structures with polyaromatics at their cores, and soft outer shells made up of aliphatic chains. This resear…
A negative correlation was previously reported between the transit depth of Kepler's Q1-Q12 gas giant candidates and the stellar metallicity. In this present work, we revisit this correlation to better understand the role of the stellar metallicity in the formation of giant planets, in particular, to investigate the e…
A polyoxovanadium borate (H2 dap)6H[V12B16O54(OH)4] · 12H2O (dap=1,2-diaminopropane) with novel structure was hydrothermally synthesized and characterized by the single crystal X-ray diffraction. It crystallizes in triclinic system with space group Piand unit cell parameters a=19.027(4), b=16.142(3) Å, c=26.679(5) Å,…
This thesis describes significant changes in the type and degree of localized corrosion for sensitized AA5083 under an applied tensile stress. AA5083 is an aluminum-magnesium alloy that experiences severe intergranular corrosion and intergranular stress corrosion cracking if sensitized. In this research, AA5083-H116 p…
Deep vein thrombosis is a debilitating condition that can result in pulmonary embolism, or post-thrombotic syndrome. Clot lysis can be initiated with histotripsy, a novel form of therapeutic ultrasound that uses the mechanical action of microbubble clouds to ablate tissue. Thrombolytic-loaded echogenic liposomes (t-EL…
Las potong portable merupakan salah satu jenis alat potong logam yang membutuhkan kalor dalam jumlah banyak, karena memanfaatkan reaksi kimia berupa gas dari campuran oksigen dan asetilen. Proses pemotongan logam dilakukan dengan cara memanaskan logam sampai mendekati titik cair kemudian ditekan dengan semburan gas pa…
In this paper, an enhanced method is proposed for measuring porosity, tortuosity, viscous, and thermal characteristic length of porous materials having a rigid frame via reflected ultrasonic waves at oblique incidence using the equivalent fluid model. The advantage of the proposed method is that the four parameters ar…
The phenomenon known as cavitation can occur when a volume of liquid is subjected to a pressure that falls below a “cavitation threshold”. Following this cavitation inception, a rupturing of the fluid or rapid growth of microbubbles occurs. The cavitation threshold is typically thought to be equal to the vapor pressur…
Burst wave lithotripsy (BWL) is a new non-invasive approach for treating kidney stones that uses short bursts of ultrasound at low duty factors. An important difference between BWL and SWL relates to the potential for generating cavitation in the kidney that could cause injury. To study such cavitation behavior, 17 pi…
Burst wave lithotripsy (BWL) is an experimental treatment to noninvasively fragment kidney stones using bursts of focused ultrasound. Preliminary simulations with a linear elastic model showed that resonance creates concentrated stresses, which may help predict locations of fractures in the stones. In this study, we a…
We have previously presented a liposomal formulation of mean size 140 nm, manufactured using DSPE, cholesterol, DSPC and DSPE-PEG at ratios of 65:25:3:7, which exclusively releases encapsulated doxorubicin in the presence of inertial cavitation nucleated by microbubbles (SonoVue®, Bracco) at peak rarefactional pressur…
We report a comprehensive analysis of the cloaks proposed for bending waves propagating in a thin metallic plate. The analysis uses a semi-analytical model which is able to reproduce the experimental data reported by Stenger and coworkers [see Phys. Rev. Lett., vol. 108, 014301 (2012)]. The model is based on the Kirko…
A one-pot synthetic method is developed for the fabrication of 3D self-growth NiO/TiO2 through a simple low-temperature hydrothermal synthesis by simply immersing nickel foam in an aqueous solution of TiCl4. The 3D NiO/TiO2 nanoparticles exhibit enhanced lithium-ion-storage performance. More details can be found in th…
The efficiency of solar thermal collectors strongly depends on the optical properties of solar selective materials used in their design since the solar absorber surfaces should have high solar absorptance in the wavelength range of 0.3–2.5 µm and low thermal emittance in the infrared region (beyond 2.5 µm). Different…
Acoustic metasurfaces are thin, engineered structures that can control the local reflection and transmission phase of acoustic waves, and thus enable a high degree of flexibility of wave manipulation. They are currently under active investigation by a multiple research groups for diffractive acoustic elements, surface…
Permanent magnets are vital components in the rapidly-developing renewable energy sector, where the motors for electric vehicles and the generators in wind turbines require strong magnets with the ability to operate at temperatures well over 100°C. To achieve high coercivity, remanence and consequently high energy pro…