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 64 for “"Hollow Core"”.
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Loading rubidium atoms into a hollow core fiber
… trapping, and transferring rubidium atoms into a hollow core photonic band gap fiber. The atoms are first collected in a magneto-optical trap (MOT) and then cooled using polarization gradient cooling. Magnetic traps are then used to confine and transfer the atoms toward the face of the fiber. An …
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Behaviour of long span composite beams with precast hollow-core slabs
The use of precast hollow-core concrete slabs with Fabsec steel beams in composite construction has had little research conducted in this area. The main purpose of the research is to develop an understanding into the behaviour of this form of construction and to demonstrate the advantages of using …
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Development of hollow-core photonic bandgap fibres free of surface modes
… can only guide light in a high refractive index core by total internal reflection. By using total internal reflections it is not possible to guide light in an air core. Light guidance in air is of great interest for various technological and scientific applications and has only recently been …
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Hollow core photonic crystal fibre as a viscosity and Raman sensor
This PhD thesis investigates the application of hollow core photonic crystal fibre for use as an optical fibre nano litre liquid sensor. The use of hollow core photonic crystal fibre for optical fibre sensing is influenced by the vast wealth of knowledge, and years of research that has been …
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An investigation on thermal performance characteristics of hollow-core vacuum insulated panels
… and invite further research in this area. Hollow-core VIPs are an alternative vacuum insulating technology that can provide thin insulating cladding solutions while avoiding some vulnerabilities of high performance insulating materials such as fumed silica VIPs.This thesis aims to develop …
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New applications of hollow-core components in housing, administrative and public housing
Standard prestressed hollow-core slabs have many advantages as construction members while being relatively very low in cost. The principal advantages include the ease of mass production, a small cross-sectional area, light weight, and flat surfaces. In addition, the slabs have the advantage s of …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
… most setups to date have occurred in free-space. Hollow-core photonic crystal fibers offer a potential alternative to free-space setups through their small cores (~10’s of µm) and low-loss guidance. Furthermore, HC-PCF can be made into fiber cells that could be directly integrated into existing …
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Behavior of hollow-core fiber reinforced polymer-concrete-steel bridge columns under extreme loading
… innovative, resilient, and quickly-constructed hollow-core fiber reinforced polymer-concrete-steel (HC-FCS) bridge columns under extreme loading. The HC-FCS column consists of a concrete wall sandwiched between an outer fiber reinforced polymer (FRP) tube and an inner steel tube. The steel tube …
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Development of a Hollow-Core Fiberoptic Microneedle Device for the Treatment of Invasive Bladder Cancer
… chronicles the early development of the hollow-core fiberoptic microneedle device (FMD). The study determined that for straight tubing with an inner bore of 150 ?m and a length greater than 50 mm long, Poiseuille's Law was shown to be accurate within 12% of experimental data for the …
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Vibration behaviour of pre-stressed precast hollow core floor with concrete topping thickness and boundary condition
… in floor vibration. The pre-stressed precast hollow core floor (PPHCF) in a four-storey office building was selected in performing an investigation on floor vibration regarding its properties. The PPHCF is known for its long-span and had longitudinal void along the length, which is made …
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Protein Biophysics in Hollow-Core Photonic Crystal Fibres: Label-Free Monitoring of Biomolecules in Optofluidic Waveguides
… In this PhD dissertation, we study the use of hollow-core photonic crystal fibre (HC-PCF), a class of optofluidic waveguides, to optically detect and monitor proteins in microfluidic environments without labels. Within this waveguiding microfluidic fibre geometry, we monitor the label-free …
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The development of an alternate building system based on the use of an existing standardized component : precast, prestressed, hollow-core concrete slab
… The type in question is a precast, prestressed, hollow-core concrete slab, extending its use from its current application in floor and roof decks to load - bearing wall panels. The system incorporates three additional structural members in order to perform autonomously: continuous prefabricated …
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Optical and optoelectronic fiber devices
… work, are the surface-emitting fiber laser, the hollow-core fiber amplifier, the thermally self-monitored high-power transmission fiber device, and the photo-detecting fiber-web based imaging system. This work presents the design, analysis, and characterization of those devices. It opens with a …
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Cylindrical photonic crystals
… the effects discussed in each chapter range from hollow-core transmission to zero and negative group velocity propagation and to high-Q cavity confinement, they are all a result of the photonic band gap guiding mechanism. The reflective cladding of the photonic crystal waveguide is unique in that …
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Seismic Performance of Precast Concrete Flooring Systems
… review, the support connections both for deep hollow-core precast concrete floors and for rib and timber infill precast concrete floors were identified as requiring further research to support seismic design and assessment guidelines. Deep hollow-core floors were identified because of the …
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Direct and inverse design of microstructured optical fibres
… the fibre guides light in either a solid or a hollow core, have created new opportunities in diverse areas of science and technology. Applications range from the generation of supercontinuum light to optical sensing, nonlinear telecom devices and the generation and delivery of extremely high …
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High speed optical communication systems: From modulation formats to radically new fibres
… computing and video on demand, is driving the core optical communication links closer and closer to their maximum capacity. The research community has clearly identifying the coming approach of the nonlinear Shannon limit for standard single mode fibre [1,2]. It is in this context that the work …
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Finite element modelling of shear connection for steel-concrete composite girders
… composite girders with solid slabs and precast hollow core slabs. The finite element package ABAQUS was used to conduct the analysis. Push-off tests with both types of slabs were simulated taking into consideration all material nonlinearities of the components. The models are able to predict the …
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