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Displaying Results 151 - 175 of 12074 on page 7 of 483
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A high-speed vertical transition for multi-layer A1N carrier boards designed by time-domain reflectometry
(2019)
Jezzini, Moises A.; Marraccini, Philip J.; Peters, Frank H.
A high-speed vertical transition for multi-layer A1N carrier boards designed by time-domain reflectometry
(2019)
Jezzini, Moises A.; Marraccini, Philip J.; Peters, Frank H.
Abstract:
High density, high speed photonic integrated circuits (PICs) have large numbers of closely spaced DC and RF contacts, which must be connected in the package. The use of multilayer carrier boards to interface between the contacts and the package gives high performance and high density. In order to be effective as a packaging solution, these multi-layer carrier boards need high-speed electrical channels with good performance. Also, the boards usually need high thermal conductivity to manage the heat. Co-fired aluminium nitride (A1N) has the needed high thermal conductivity. However, there are no designs of multi-layer high-speed channels in the literature for co-fired A1N. Therefore, this article presents a high-speed multi-layer channel for co-fired A1N and its measured results. Two transmission lines were designed that showed a measured loss of Ë 0.09dBmm-1 at 40GHz. The vertical transition allows for arbitrary planar rotations of the channel and showed a measured 3 dB bandwidth of...
http://hdl.handle.net/10468/9873
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Comparative analysis of plant-based high-protein ingredients and their impact on quality of high-protein bread
(2019)
Hoehnel, Andrea; Axel, Claudia; Bez, Jrgen; Arendt, Elke K.; Zannini, Emanuele
Comparative analysis of plant-based high-protein ingredients and their impact on quality of high-protein bread
(2019)
Hoehnel, Andrea; Axel, Claudia; Bez, Jrgen; Arendt, Elke K.; Zannini, Emanuele
Abstract:
The orientation of consumers and industry towards plant-based foods on one hand and high-protein products on the other is persistently increasing. Bread, as a staple food, is a promising matrix for the incorporation of plant-based high-protein ingredients to combine both trends. This study aims to provide a better understanding of techno-functional changes and impacts of plant-proteins during bread production, which could advance the development of high-quality products with high levels of plant-protein. A selection of high-protein ingredients from wheat, maize, potato, carob, pea, lupin and faba bean were subjected to compositional analysis and applied in wheat bread formulations, replacing 15% of wheat flour. Their impact on dough properties (gluten-aggregation, pasting behaviour, rheology) as well as bread quality (volume, crumb structure, crumb hardness) was analysed. The high-protein ingredients were found to affect gluten-aggregation, pasting and bread characteristics. Results...
http://hdl.handle.net/10468/8345
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Integrated magnetic components for high-power high-current dc-dc converters
(2013)
Hartnett, Kevin John
Integrated magnetic components for high-power high-current dc-dc converters
(2013)
Hartnett, Kevin John
Abstract:
This thesis is focused on the design and development of an integrated magnetic (IM) structure for use in high-power high-current power converters employed in renewable energy applications. These applications require low-cost, high efficiency and high-power density magnetic components and the use of IM structures can help achieve this goal. A novel CCTT-core split-winding integrated magnetic (CCTT IM) is presented in this thesis. This IM is optimized for use in high-power dc-dc converters. The CCTT IM design is an evolution of the traditional EE-core integrated magnetic (EE IM). The CCTT IM structure uses a split-winding configuration allowing for the reduction of external leakage inductance, which is a problem for many traditional IM designs, such as the EE IM. Magnetic poles are incorporated to help shape and contain the leakage flux within the core window. These magnetic poles have the added benefit of minimizing the winding power loss due to the airgap fringing flux as they shape...
http://hdl.handle.net/10468/1278
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High performance germanium nanowire based lithium-ion battery anodes extending over 1000 cycles through in-situ formation of a continuous porous network
(2014)
Kennedy, Tadhg; Mullane, Emma; Geany, Hugh; Osiak, Michal J.; O'Dwyer, Colm; Ryan,...
High performance germanium nanowire based lithium-ion battery anodes extending over 1000 cycles through in-situ formation of a continuous porous network
(2014)
Kennedy, Tadhg; Mullane, Emma; Geany, Hugh; Osiak, Michal J.; O'Dwyer, Colm; Ryan, Kevin M.
Abstract:
Here we report the formation of high-performance and high-capacity lithium-ion battery anodes from high-density germanium nanowire arrays grown directly from the current collector. The anodes retain capacities of ∼900 mAh/g after 1100 cycles with excellent rate performance characteristics, even at very high discharge rates of 20–100C. We show by an ex situ high-resolution transmission electron microscopy and high-resolution scanning electron microscopy study that this performance can be attributed to the complete restructuring of the nanowires that occurs within the first 100 cycles to form a continuous porous network that is mechanically robust. Once formed, this restructured anode retains a remarkably stable capacity with a drop of only 0.01% per cycle thereafter. As this approach encompasses a low energy processing method where all the material is electrochemically active and binder free, the extended cycle life and rate performance characteristics demonstrated makes these anodes...
http://hdl.handle.net/10468/6113
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Development of models for the successful implementation of collaborative planning, forecasting and replenishment (CPFR) in high-tech industries
(2015)
Panahifar, Farhad
Development of models for the successful implementation of collaborative planning, forecasting and replenishment (CPFR) in high-tech industries
(2015)
Panahifar, Farhad
Abstract:
ndustries with high demand uncertainties and long lead times, such as those in the high-tech, face many challenges in managing their supply chains. Generally, high-tech industries are highly capital intensive and are characterized by high customer expectations, short product life cycles, proliferating product variety, unpredictable demand, long and variable manufacturing cycle times, and complex supply chains. A significant problem for managing their supply chains is the bullwhip effect which is intensified by poor information transmission up and down the supply chain. To address these problems, researchers have proposed the development of high level collaboration with trading partners. In other words, coordination and interaction through real time information sharing are the key principles in the design and development of supply chain solutions which are designed to meet the challenges in high-tech industries. Therefore, it is essential for organisations to be able to share operati...
http://hdl.handle.net/10344/7075
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Growth of crystalline copper silicide nanowires in high yield within a high boiling point solvent system
(2012)
Geaney, Hugh; Dickinson, Calum; O'Dwyer, Colm; Mullane, Emma; Singh, Ajay; Ryan, K...
Growth of crystalline copper silicide nanowires in high yield within a high boiling point solvent system
(2012)
Geaney, Hugh; Dickinson, Calum; O'Dwyer, Colm; Mullane, Emma; Singh, Ajay; Ryan, Kevin M.
Abstract:
Here, we report the formation of high density arrays of Cu15Si4 nanowires using a high boiling point organic solvent based method. The reactions were carried out using Cu foil substrates as the Cu source with nanowire growth dependent upon the prior formation of Cu15Si4 crystallites on the surface. The method shows that simple Si delivery to metal foil can be used to grow high densities of suicide nanowires with a tight diameter spread at reaction temperatures of 460 degrees C. The nanowires were characterized by high-resolution transmission electron microscopy (HRTEM), high-resolution scanning electron microscopy (HRSEM), and X-ray photoelectron spectroscopy (XPS), and electrical analysis showed that they possess low resistivities.
peer-reviewed
http://hdl.handle.net/10344/7379
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Recombination from polar InGaN/GaN quantum well structures at high excitation carrier densities
(2018)
Christian, G. M.; Schulz, Stefan; Kappers, M. J.; Humphreys, C. J.; Oliver, R. A.; Daws...
Recombination from polar InGaN/GaN quantum well structures at high excitation carrier densities
(2018)
Christian, G. M.; Schulz, Stefan; Kappers, M. J.; Humphreys, C. J.; Oliver, R. A.; Dawson, Philip
Abstract:
In this paper we report on the emergence of a high energy band at high optically excited carrier densities in the low temperature photoluminescence spectra from polar InGaN/GaN single quantum well structures. This high energy band emerges at carrier densities when the emission from the localized ground states begins to saturate. We attribute this high energy band to recombination involving higher energy less strongly localized electron and hole states that are populated once the localized ground states become saturated; this assignment is supported by the results from an atomistic tight-binding model. A particular characteristic of the recombination at the high carrier densities is that the overall forms of the photoluminescence decay curves bear great similarity to those from semiconductor quantum dots. The decay curves consist of plateaus where the photoluminescence intensity is constant with time as a result of Pauli state blocking in the high energy localized states followed by ...
http://hdl.handle.net/10468/7202
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High-speed programmable optical attenuator.
(2000)
Riza, Nabeel A.; Yaqoob, Zahid
High-speed programmable optical attenuator.
(2000)
Riza, Nabeel A.; Yaqoob, Zahid
Abstract:
A high-speed programmable optical attenuator (POA) is introduced that can provide high dynamic range and high resolution attenuation control. An acousto-optic Bragg cell has been used to realize the desired attenuator. Various practical architectures have been proposed to prove the concept. A typical acousta-optic deflector (AOD) based design offers a dynamic range of 46.11 dB. The average resolution is 3.08 dB/volt whereas the best resolution achieved is 0.39 dB/volt. The response time of the AO attenuator is in the sub CLS regime, and was observed as low as 0.175 mu s. The polarization dependent loss (PDL) was about 0.7 dB, whereas the excess losses were about 1.5 dB.A high-speed programmable optical attenuator (POA) is introduced that can provide high dynamic range and high resolution attenuation control. An acousto-optic Bragg cell has been used to realize the desired attenuator. Various practical architectures have been proposed to prove the concept. A typical acousta-optic def...
http://hdl.handle.net/10468/10171
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The american high school graduation rate : trends and levels
(2009)
Heckman, James J.; LaFontaine, Paul A.
The american high school graduation rate : trends and levels
(2009)
Heckman, James J.; LaFontaine, Paul A.
Abstract:
This paper applies a unified methodology to multiple data sets to estimate both the levels and trends in U.S. high school graduation rates. We establish that (a) the true high school graduation rate is substantially lower than widely used measures; (b) the U.S. graduation rate peaked in the early 1970s; (c) majority/minority differentials are substantial and have not converged over the past 35 years; (d) lower post-1970 rates are not solely due to increasing immigrant and minority populations; (e) our findings explain part of the slowdown in college attendance and the rise in college wage premiums; and (f) growing high school graduation differentials by gender help explain increasing male-female college attendance gaps
http://hdl.handle.net/10197/1641
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High strain rate constitutive equation for metallic materials
(1991)
Hamouda, A. M. S
High strain rate constitutive equation for metallic materials
(1991)
Hamouda, A. M. S
Abstract:
The yield stress and flow stress increase significantly with strain rate. High speed Forming and Machining operation gives rise to strain rates varying from 10 to 10^ per second. A number of research work have been reported in which various techniques have been described for strain rates sensitivity. One of the reported technique 1 was based on high speed compression of small cylindrical specimens with tool steel projectile. The deformation was recorded with a high speed camera operating at 500,000 frames per second. The equipment is very expensive and the processing of the picture for data is very tedious and subjected to human error. The present study was aimed at using a similar technique of high speed compression without having to use any high speed photographs. From known initial and final dimension of the specimen together with the mass and the impact speed of the projectile, the deformation is simulated using a finite-difference technique based on an assumed dynamic constitu...
http://doras.dcu.ie/18796/
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High Stakes Testing and Student Perspectives on Teaching and Learning in the Republic of Ireland
(2012)
Smyth, Emer; Banks, Joanne
High Stakes Testing and Student Perspectives on Teaching and Learning in the Republic of Ireland
(2012)
Smyth, Emer; Banks, Joanne
Abstract:
There is now a well developed literature on the impact of high stakes testing on teaching approaches and student outcomes. However, the student perspective has been neglected in much research. This article draws on a mixed method longitudinal study of secondary students in the Republic of Ireland to explore the impact of two sets of high stakes examinations on student experiences. The analyses are based on surveys completed by 897 lower secondary students and 748 upper secondary students, along with 47 lower secondary and 53 upper secondary group interviews with students. Findings show the presence of impending high stakes exams results in increased workload for students, with many reporting pressure and stress. Throughout their schooling career, students clearly favour active learning approaches. However, for some students, particularly high-aspiring middle-class students, these views change as they approach the terminal high stakes exam, with many showing a strong preference for a...
http://hdl.handle.net/2262/67342
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The Effect of Principal Component Analysis on Machine Learning Accuracy with High Dimensional Spectral Data
(2009)
Ryder, Alan G.; O Connell, Marie-Louise; Madden, Michael G.; Howley, Tom
The Effect of Principal Component Analysis on Machine Learning Accuracy with High Dimensional Spectral Data
(2009)
Ryder, Alan G.; O Connell, Marie-Louise; Madden, Michael G.; Howley, Tom
Abstract:
The classi¿cation of high dimensional data, such as images, gene-expression data and spectral data, poses an interesting challenge to machine learning, as the presence of high numbers of redundant or highly correlated attributes can seriously degrade classification accuracy. This paper investigates the use of Principal Component Analysis (PCA) to reduce high dimensional data and to improve the predictive performance of some well known machine learning methods. Experiments are carried out on a high dimensional spectral dataset, in which the task is to identify a target material within a mixture. These experiments employ the NIPALS (Non-Linear Iterative Partial Least Squares) PCA method, a method that has been used in the field of chemometrics for spectral classification, and is a more efficient alternative than the widely used eigenvector decomposition approach. The experiments show that the use of this PCA method can improve the performance of machine learning in the classification ...
http://hdl.handle.net/10379/194
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Characterization of single-mode laser and tunable laser array based on etched high order surface gratings
(2015)
Abdullayev, Azat
Characterization of single-mode laser and tunable laser array based on etched high order surface gratings
(2015)
Abdullayev, Azat
Abstract:
THESIS 10533
Wavelength tunable single-mode semiconductor lasers play an essential role in modern optical communication systems. They are also rapidly replacing fixed-wavelength light sources in dense wavelength-division-multiplexing (DWDM) systems, which will significantly reduce the system size and cost. The optical communication industry demands light sources with relatively small volume, low inventory cost and high manufacturing yield process. Therefore, laser diodes along with high power, stable operation and narrow linewidth should have simple fabrication process and high yield. Up to now conventional distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers achieved great success in terms of stable operation, high power and wide tuning range. However, these lasers require complex fabrication steps and high resolution processing by using e-beam lithography which is time consuming and an expensive process. Previously it was demonstrated that single-mode operat...
http://hdl.handle.net/2262/77841
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The effectiveness of short-term high-intensity exercise on ventilatory function, in adults with a high risk of chronic obstructive pulmonary disease
(2017)
Helal, Omar Farouk; Alshehri, Mansour Abdullah; Alayat, Mohamed S.; Alhasan, Hammad; To...
The effectiveness of short-term high-intensity exercise on ventilatory function, in adults with a high risk of chronic obstructive pulmonary disease
(2017)
Helal, Omar Farouk; Alshehri, Mansour Abdullah; Alayat, Mohamed S.; Alhasan, Hammad; Tobaigy, Abdullah
Abstract:
This study sets out to investigate whether a short-term high-intensity arm ergometer exercise plan can be of benefit to adults whose poor ventilatory function places them at risk of developing chronic obstructive pulmonary disease. [Subjects and Methods] A pre-experimental design with a convenience sample was employed. The study enrolled 30 adult smokers, aged between 18–25 years old, all of whom were at a high risk of chronic obstructive pulmonary disease. The participants did a daily 20-minute high-intensity arm ergometer exercise, at 75% target heart rate, at the same time over a period of three days. The forced vital capacity test manoeuvre was carried out before the sessions, and once all three had been done. [Results] The study demonstrated a sizeable increase in the mean values of forced vital capacity and forced expiratory volume in one second. The mean values of expiratory volume in one second/forced vital capacity as well as peak expiratory flow rate were not significant s...
http://hdl.handle.net/10468/4024
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An investigation of border traps and interface states in high-k/InGaAs metal-oxide-semiconductor systems
(2017)
Lin, Jun
An investigation of border traps and interface states in high-k/InGaAs metal-oxide-semiconductor systems
(2017)
Lin, Jun
Abstract:
One approach to saving energy in metal-oxide-semiconductor field effect transistors (MOSFETs) is to replace SiO2/Si structure with high dielectric constant (high-k) oxides on high mobility channel materials (e.g. InGaAs), which have the potential to achieve a comparable on current and operating frequency to silicon, but at a reduced supply voltage. In this thesis, investigation into border traps (or charge trapping) and interface states, both of which can induce device instability, in HfO2/InGaAs and Al2O3/InGaAs metal-oxidesemiconductor (MOS) structures was carried out with an emphasis on the characterization of border traps using capacitance-voltage (C-V) hysteresis measurement. The charge trapping is observed to be mainly a reversible process. The trapped charge is predominantly localized as a sheet charge near/at the high-k/InGaAs interfacial layer (~1nm), which can contain native oxides of InGaAs. The engineering of the high-k/InGaAs interface is therefore the key to reducing C...
http://hdl.handle.net/10468/5349
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Quasi-static and high strain rate response of Kevlar reinforced thermoplastics
(2021)
Chouhan, Hemant; Bhalla, Neelanchali Asija; Bandaru, Aswani Kumar; Gebremeskel, Shishay...
Quasi-static and high strain rate response of Kevlar reinforced thermoplastics
(2021)
Chouhan, Hemant; Bhalla, Neelanchali Asija; Bandaru, Aswani Kumar; Gebremeskel, Shishay Amare; Bhatnagar, Naresh
Abstract:
The present study deals with the quasi-static and high strain rate characterization of Kevlar-129 based thermoplastic composites. Two different thermoplastic matrices, namely, Polypropylene (PP) and Polyetherimide (PEI) were used to manufacture composite laminates. Quasi-static compression tests were performed at strain rates of 0.041 s−1 and 0.045 s−1. High strain rate tests were performed using a split Hopkinson pressure bar apparatus within the strain rates ranging from 2548 s−1 to 4379 s−1. Stress-strain relations reveals the rate-sensitive behaviour of composites. Kevlar/PP (K-PP) showed higher peak stress under quasi-static loading as compared to the high strain rate test. Comparable peak stresses were revealed under quasi-static and high strain rate loading for Kevlar/PEI (K-PEI) composite. Also, high strain rate compression properties such as peak stress, peak strain and toughness of K-PP were 25%, 27% and 6% higher than that of the K-PEI composite. The failure mechanisms of...
http://hdl.handle.net/10344/9616
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The effects of acute and chronic sodium bicarbonate supplementation on high-intensity intermittent performance, recovery and subsequent performance in rugby union players
(2012)
Fitzpatrick, Paula
The effects of acute and chronic sodium bicarbonate supplementation on high-intensity intermittent performance, recovery and subsequent performance in rugby union players
(2012)
Fitzpatrick, Paula
Abstract:
Exogenous ingestion of alkalising agents, such as sodium bicarbonate (SB), has been shown to enhance muscle buffering capacity, thereby delaying the metabolic acidosis associated with high-intensity exercise and potentially improving performance. Aim: The aim of this research was to examine the effects of acute and chronic SB supplementation and a placebo (PLA) on high-intensity intermittent performance, recovery and subsequent performance in trained rugby union players. Methods: This aim was achieved through the completion of three interconnected studies. Study 1 examined the effects of acute versus chronic SB supplementation on high-intensity intermittent performance as assessed by 6 x 10s maximal sprint tests on a cycle ergometer. Study 2 investigated effects of chronic SB supplementation on a specifically designed field-based, highintensity intermittent rugby sevens-specific protocol. Study 3 evaluated the effects of acute SB supplementation on an 80-minute high-intensity interm...
http://doras.dcu.ie/17519/
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High school physical education teachers and their world of work: scope and direction of the project
(1994)
O'Sullivan, Mary
High school physical education teachers and their world of work: scope and direction of the project
(1994)
O'Sullivan, Mary
Abstract:
There is a paucity of literature on the specific issues of high school physical education and how those who do the job manage to create quality programs. Since a recent issue of Quest (Siedentop & O'SulIivan, 1992) featured secondary school physical education, one might wonder whether a monograph so soon afterwards would be overkill. I would like to address this concem up front by suggesting that the intent of this project was significantly different from, though complementary to, the Quest effort. The Quest feature presented a critique of societal factors within which contemporary physical education programs and practices might be designed, critiqued, and challenged. This project presents an intensive study of the issues and concems about high school physical education teaching and programming at a micro level with 11 high school teachers and their world of physical education and teaching in today's high schools. The monograph attempts to describe, discuss, and unders...
http://hdl.handle.net/10344/3178
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Effects of high intensity interval training and high volume endurance training on maximal aerobic capacity, speed and power in club level gaelic football players
(2013)
Cregg, Cathal J
Effects of high intensity interval training and high volume endurance training on maximal aerobic capacity, speed and power in club level gaelic football players
(2013)
Cregg, Cathal J
Abstract:
Purpose: To compare the effects of high intensity interval training (HIIT) and high volume endurance training (HVET) on indices of endurance, speed and power in male Gaelic football players. Methods: Club level Gaelic football players (n=25) ranging from 18 to 35 years of age were randomly assigned to a HIIT (mean ± SD; 27.2 ± 3.6 yr) or a HVET ( mean ± SD 24.7 ± 4.0 yr) group. Participants trained 3 d.wk-1 for 6 weeks. Maximal aerobic capacity, vertical jump (VJ), countermovement jump (CMJ), and 5 m and 20 m sprint times were measured at baseline and after 6 weeks. Participants also performed 6 x 10 sec bouts of cycling against a resistance equal to 7.5% body weight interspersed with a 50 sec recovery period before and after the 6 weeks of training. Results: Maximal aerobic capacity increased significantly in both the HIIT and HVET group in response to the 6 week training program, and the percentage improvement was similar (7%) in both groups. There was no change in CMJ, CMJ fl...
http://doras.dcu.ie/17709/
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All-optical sampling based on two-photon absorption in a semiconductor microcavity for high-speed OTDM
(2005)
Donegan, John; Bradley, Louise
All-optical sampling based on two-photon absorption in a semiconductor microcavity for high-speed OTDM
(2005)
Donegan, John; Bradley, Louise
Abstract:
Future high-speed optical communications networks operating at data rates in excess of 100Gbit/s per channel will require a sensitive and ultrafast technique for precise optical signal monitoring.1 The standard way of characterising high-speed optical signals to use a fast photodetector in conjunction with a high-speed oscilloscope. However, this method is limited to a maximum data rate of approximately 40Gbit/s. An alternative is to employ all-optical sampling techniques based on ultrafast optical nonlinearities present in optical fibres, optical crystals and semiconductors. One such nonlinearity is the optical-to-electrical process of Two-Photon Absorption (TPA) in a semiconductor. This paper presents an optical sampling technique based on TPA in a specially designed semiconductor microcavity. By incorporating the microcavity design, we are able to enhance the TPA efficiency to a level that can be used for high-speed optical sampling.
http://hdl.handle.net/2262/37326
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High-resolution hot-film measurement of surface heat flux to an impinging jet
(2011)
MURRAY, DARINA; PERSOONS, TIM
High-resolution hot-film measurement of surface heat flux to an impinging jet
(2011)
MURRAY, DARINA; PERSOONS, TIM
Abstract:
To investigate the complex coupling between surface heat transfer and local fluid velocity in convective heat transfer, advanced techniques are required to measure the surface heat flux at high spatial and temporal resolution. Several established flow velocity techniques such as laser Doppler anemometry, particle image velocimetry and hot wire anemometry can measure fluid velocities at high spatial resolution (?m) and have a high-frequency response (up to 100 kHz) characteristic. Equivalent advanced surface heat transfer measurement techniques, however, are not available; even the latest advances in high speed thermal imaging do not offer equivalent data capture rates. The current research presents a method of measuring point surface heat flux with a hot film that is flush mounted on a heated flat surface. The film works in conjunction with a constant temperature anemometer which has a bandwidth of 100 kHz. The bandwidth of this technique therefore is likely to be in excess of more ...
http://hdl.handle.net/2262/61809
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Characterization of Rapid Melt Growth (RMG) Process for High Quality Thin Film Germanium on Insulator
(2012)
PEROVA, TANIA
Characterization of Rapid Melt Growth (RMG) Process for High Quality Thin Film Germanium on Insulator
(2012)
PEROVA, TANIA
Abstract:
Germanium is one of the most promising materials for high performance infra-red photovoltaic devices. High quality singlecrystal germanium on insulator structures can be produced by a Rapid Melt Growth process. Experiments show that thin-film germanium deposited by physical vapor deposition provides better quality in comparison with chemical vapor deposition. The longitudinal optical Ge-Ge peak in Raman spectrum is shifted from the expected 300.2 cm-1 position due to tensile stress resulting from the thermal expansion differences of the materials. The importance of silicon in the rapid melt process is confirmed by the fact that germanium films on sapphire substrates yielded polycrystalline structure. Films produced at high temperature (980 oC) show Ge- Ge Raman peak with linewidth of 3.3 cm-1 indicating good crystalline quality, comparable to bulk germanium (3.2 cm-1), and thus demonstrating the potential to produce low cost high quality germanium films.
http://hdl.handle.net/2262/67198
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High-current inductors for high-power automotive DC-DC converters
(2008)
Lyons, Brendan
High-current inductors for high-power automotive DC-DC converters
(2008)
Lyons, Brendan
Abstract:
This thesis is focused on the investigation of magnetic materials for high-power dcdc converters in hybrid and fuel cell vehicles and the development of an optimized high-power inductor for a multi-phase converter. The thesis introduces the power system architectures for hybrid and fuel cell vehicles. The requirements for power electronic converters are established and the dc-dc converter topologies of interest are introduced. A compact and efficient inductor is critical to reduce the overall cost, weight and volume of the dc-dc converter and optimize vehicle driving range and traction power. Firstly, materials suitable for a gapped CC-core inductor are analyzed and investigated. A novel inductor-design algorithm is developed and automated in order to compare and contrast the various magnetic materials over a range of frequencies and ripple ratios. The algorithm is developed for foil-wound inductors with gapped CC-cores in the low (10 kHz) to medium (30 kHz) frequency range and inve...
http://hdl.handle.net/10468/1567
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Sensitive, high-strain, high-rate bodily motion sensors based on graphene-rubber composites
(2014)
KHAN, UMAR; COLEMAN, JONATHAN
Sensitive, high-strain, high-rate bodily motion sensors based on graphene-rubber composites
(2014)
KHAN, UMAR; COLEMAN, JONATHAN
Abstract:
Monitoring of human bodily motion requires wearable sensors which can detect position, velocity and acceleration. They should be cheap, lightweight, mechanically compliant and display reasonable sensitivity at high strains and strain-rates. No reported material has simultaneously demonstrated all the above requirements. Here we describe a simple method to infuse liquid-exfoliated graphene into natural rubber to create conducting composites. These materials are excellent strain-sensors displaying 104-fold increases in resistance and working at strains exceeding 800%. The sensitivity is reasonably high with gauge factors of up to 35 observed. More importantly, these sensors can effectively track dynamic strain, working well at vibration frequencies of at least 160 Hz. At 60 Hz, we could monitor strains of at least 6% at strain rates exceeding 6000 %/s. We have used these composites as bodily motion sensors, effectively monitoring joint and muscle motion as well and breathing and pulse.
http://hdl.handle.net/2262/73940
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A combined assessment of air and noise pollution on the High Line, New York City
(2015)
PILLA, FRANCESCO
A combined assessment of air and noise pollution on the High Line, New York City
(2015)
PILLA, FRANCESCO
Abstract:
The High Line is an elevated public park in New York City, transformed from an unused freight rail line. Pedestrians walking through Manhattan?s West Side can walk either on the High Line or on a footpath below. Using Manhattan as a laboratory, this paper offers a combined assessment of noise and particulate matter pollution for its pedestrians. Noise and PM levels were recorded simultaneously for two cases (i) pedestrians walking on a footpath alongside road traffic and (ii) pedestrians walking on the elevated High Line. Testing took places over three days in autumn 2014. Results were analysed to investigate if pedestrians using the High Line would have a lower pollution exposure to those using the footpath below. Results showed statistically significant differences between the upper and lower levels in exposure to both pollution types. In order to quantify the overall impact, results are expressed through a combined air?noise pollution index. This index indicates that the average ...
http://hdl.handle.net/2262/74975
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