Global ETD Search
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 189 for “"Engineering & allied operations"”.
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Non-invasive microwave-based sensor system for monitoring hydration levels in patients with electromagnetic waves
This thesis presents the design, development, and experimental validation of a novel, noninvasive microwave-based biosensor system for real-time hydration monitoring. Addressing a critical need in clinical and wearable health technology, the research explores the use of dielectric properties of …
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Plastic optical fibre couplers with wavelength division multiplexing capability for short-range peer-to-peer communication in networking and industrial applications
This thesis presents a study on the design and simulation of adjustable, multi-output plastic optical fibre (POF) array couplers for wavelength-division multiplexed (WDM) transmission in the visible spectrum. The research focuses on three configurations—1×2, 1×4, and 1×8—and introduces a novel …
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An intelligent approach to quality of service for MPEG-4 video transmission in IEEE 802.15.1
Nowadays, wireless connectivity is becoming ubiquitous spreading to companies and in domestic areas. IEEE 802.15.1 commonly known as Bluetooth is high-quality, high-security, high-speed and low-cost radio signal technology. This wireless technology allows a maximum access range of 100 meters yet …
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Factors in the prevention of collisions at sea
In recent years, the International Regulations for Preventing Collisions at Sea have been the subject of lengthy and sometimes heated public discussion. Many suggestions, at various levels of practicality, have been made for amending the regulations both by individuals and by committees. Two …
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Investigation and development of a novel metrology standard for the measurement of relative intensity noise and frequency chirp of DFB lasers in optical networks
Laser diode Relative Intensity Noise (RIN) metrology capabilities have been developed and demonstrated, providing significantly improved sensitivity and accuracy than existing methods. This is a key parameter for laser components used in telecommunication systems due to the drive to reduce inherent …
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Novel narrowband microstrip filters for wireless communications systems
The novel resonant structures based on microstrip integrated circuit technology have been developed and extensively studied in this research project for filter applications in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced …
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Particle swarm optimization applications to mpeg-4 transmission over ZigBee
… Optimization techniques are widely used in engineering and computer science as well as being used in real environment applications to overcome complex issues and in particular; an artificial intelligence technique known as Particle Swann Optimization (PSO) has becoming very popular. PSO is a …
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The design and realisation of electronically tunable dielectric resonator microstrip filters
Many of todays' sophisticated communication systems, particularly those operating in the microwave frequency range, have a growing demand for highly selective and frequency agile filters with fast tuning rates. At microwave frequencies above 2GHz, filters that combine both tuning speed and high …
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A fuzzy logic based approach to quality of service in 802.11b wireless networks
A generally held view is that the bulk of the data transmitted across packet switched networks in the future will be video and audio traffic. In recent years public telecommunications carriers have replaced circuit switched networks with integrated service packet networks that support both …
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Sir Joseph Bazalgette and the main drainage of London
… thirty-six thousand citizens. It examines the engineering problems presented by the need to undertake major engineering work in the most densely populated parts of the world's largest city and the novel solutions that were sometimes adopted to overcome them. It also considers the controversies …
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Complex boundary integral techniques for turbomachinery blading
Integral equation techniques are used to solve interior and exterior (including cascade) Neumann problems. The equations are in terms of the boundary values of the derivatives of the harmonic function sought. The equations are derived using the complex variables forms of Green’s theorem. They are …
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Diffusion problems and degradation of bearing overlays
The corrosion and degradation of Pb-Sn bearing overlays Is a bilateral process . During service, the lubricant becomes corrosive due to the breakdown of inhibitors with subsequent oxidation occurring at operating temperatures (120-170[degrees]). ...
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Collision avoidance at sea and on a marine radar simulator using automatic encounter detection techniques
… been shown in the field of marine traffic engineering. Real life data sources made available for maritime studies are often expensive and inconvenient to collect. The marine radar simulator presents the researcher with a relatively inexpensive and readily available source of navlgatlonal …
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The development of a crystal modulator using a multipath reflection technique
An AOP lumped crystal transverse modulator has been developed, based upon a novel crystal cut, which operates at much lower driving voltages than presently available commercial state of the art modulators. With the latter, the modulation bandwidth is limited by the requirement for driving voltages …
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An investigation of navigational decisions
This work is concerned with an examination of how the Merchant Navy Navigators use the information provided by the different aids. It is divided into three main parts. First are a series of experiments where seafarers studying for their Master’s certificate were presented with cards containing …
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Some aspects of crack initiation in mild steel subjected to fatigue stressing in a corrosive environment
Some aspects of the corrosion fatigue crack initiation in EN1 type mild steel have been studied. Results of the electrochemical investigations show that the application of both static and compressive stresses enhance anodic dissolution. Application of cyclic stress assists the breakdown of the …
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Dual-layered and wavelength-multiplexed optical barcode for high data storage
A novel barcode system design to achieve high data storage using more than one layer is introduced theoretically and tested partially in the laboratory. Compared to other existing barcode systems, diffraction gratings are used as core elements in the barcode symbol. As any other barcode system, the …
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Novel miniature microwave quasi-elliptical function bandpass filters with wideband harmonic suppression
Filters are integral components in all wireless communication systems, and their function is to permit predefined band of frequencies into the system and reject all other signals. The ever-growing demand in the use of the radio frequency (RF) spectrum for new applications has resulted in the need …
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Degradation studies on recycled Polyethylene terephthalate
This project aims to investigate the influence of UV on the properties under natural and artificial weathering. The real-time outdoor weathering exposures provide the most accurate results but, they are very slow and manufacturers cannot afford to wait in order to see if a new or improved product …
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Equation defined device modelling of floating gate M.O.S.F.E.Ts.
This research work covers the development of a novel compact model for a Floating Gate nMOSFET that will be added to the QUCS library. QUCS (Quite Universal Circuit Simulator) is a GPL simulation software package that was created in 2006 and is continuing to develop and evolve, and there is already …
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