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Displaying Results 76 - 100 of 2052 on page 4 of 83
Marked
Mark
A Very High Energy Gamma-Ray Spectrum of 1ES 2344+514
(2005)
Lang, Mark; Gillanders, Gary
A Very High Energy Gamma-Ray Spectrum of 1ES 2344+514
(2005)
Lang, Mark; Gillanders, Gary
Abstract:
The BL Lacertae (BL Lac) object 1ES 2344+514 (1ES 2344), at a redshift of 0.044, was discovered as a source of very high energy (VHE) gamma rays by the Whipple Collaboration in 1995 \citep{2344Catanese98}. This detection was recently confirmed by the HEGRA Collaboration \citep{2344Hegra03}. As is typical for high-frequency peaked blazars, the VHE gamma-ray emission is highly variable. On the night of 20 December, 1995, a gamma-ray flare of 5.3-sigma significance was detected, the brightest outburst from this object to-date. The emission region is compatible with a point source. The spectrum between 0.8 TeV and 12.6 TeV can be described by a power law $\frac{\ud^3 N}{\ud E \ud A \ud t}=(5.1\pm1.0_{st}\pm1.2_{sy})\times10^{-7} (E/ \mathrm{TeV})^{-2.54 \pm0.17_{st}\pm0.07_{sy}} \mathrm{\frac{1}{TeV m^2 s}}$. Comparing the spectral index with that of the other five confirmed TeV blazars, the spectrum of 1ES 2344 is similar to 1ES 1959+650, located at almost the same distance. The spectr...
http://hdl.handle.net/10379/2516
Marked
Mark
Inferential estimation of high frequency LNA gain performance using machine learning techniques
(2007)
Hung, Peter C.; McLoone, Sean F.; Sainchez, Magdalena; Farrell, Ronan
Inferential estimation of high frequency LNA gain performance using machine learning techniques
(2007)
Hung, Peter C.; McLoone, Sean F.; Sainchez, Magdalena; Farrell, Ronan
Abstract:
Functional testing of radio frequency integrated circuits is a challenging task and one that is becoming an increasingly expensive aspect of circuit manufacture. Due to the difficulties with bringing high frequency signals off-chip, current automated test equipment (ATE) technologies are approaching the limits of their operating capabilities as circuits are pushed to operate at higher and higher frequencies. This paper explores the possibility of extending the operating range of existing ATEs by using machine learning techniques to infer high frequency circuit performance from more accessible lower frequency and DC measurements. Results from a simulation study conducted on a low noise amplifier (LNA) circuit operating at 2.4 GHz demonstrate that the proposed approach has the potential to substantially increase the operating bandwidth ofATE.
http://eprints.nuim.ie/2321/
Marked
Mark
Influence of cavity lifetime on high-finesse microcavity two-photon absorption photodetectors
(2007)
Guo, Wei Hua; O'Dowd, John; Lynch, Michael; Bradley, Ann Louise; Donegan, John Fra...
Influence of cavity lifetime on high-finesse microcavity two-photon absorption photodetectors
(2007)
Guo, Wei Hua; O'Dowd, John; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Barry, Liam P.
Abstract:
For optical pulse incidence as compared with continuous-wave incidence, the enhancement of two-photon absorption inside a high-finesse planar microcavity is reduced, the pulse inside the cavity and the cavity spectrum are broadened. The analysis shows that for transform-limited pulse incidence, the true pulsewidth and the cavity frequency resolution can be estimated if the cavity lifetime or the cavity bandwidth has been obtained from the reflection or transmission spectrum of the cavit.
http://doras.dcu.ie/162/
Marked
Mark
How employers can face up to and enforce high standards of health and safety
(1997)
Byrne, Raymond
How employers can face up to and enforce high standards of health and safety
(1997)
Byrne, Raymond
Abstract:
This paper outlines the high standard to which employers must aspire in order to achieve compliance with their statutory responsibilities under the Safety, Health and Welfare at Work Act 1989 and the many detailed Regulations on safety and health at work now in force. These duties are based on European and international standards in occupational safety and health. The paper discusses the implications of the 1989 Act for enforcement strategies within organisations, including disciplinary matters.
http://doras.dcu.ie/2178/
Marked
Mark
High-level feature detection from video in TRECVid: a 5-year retrospective of achievements
(2009)
Smeaton, Alan F.; Over, Paul; Kraaij, Wessel
High-level feature detection from video in TRECVid: a 5-year retrospective of achievements
(2009)
Smeaton, Alan F.; Over, Paul; Kraaij, Wessel
Abstract:
Successful and effective content-based access to digital video requires fast, accurate and scalable methods to determine the video content automatically. A variety of contemporary approaches to this rely on text taken from speech within the video, or on matching one video frame against others using low-level characteristics like colour, texture, or shapes, or on determining and matching objects appearing within the video. Possibly the most important technique, however, is one which determines the presence or absence of a high-level or semantic feature, within a video clip or shot. By utilizing dozens, hundreds or even thousands of such semantic features we can support many kinds of content-based video navigation. Critically however, this depends on being able to determine whether each feature is or is not present in a video clip. The last 5 years have seen much progress in the development of techniques to determine the presence of semantic features within video. This progress can b...
http://doras.dcu.ie/2230/
Marked
Mark
Suppression of residual single-photon absorption relative to two-photon absorption in high finesse planar microcavities
(2008)
Guo, Wei Hua; O'Dowd, John; Flood, Edward; Quinlan, Tom; Lynch, Michael; Bradley, ...
Suppression of residual single-photon absorption relative to two-photon absorption in high finesse planar microcavities
(2008)
Guo, Wei Hua; O'Dowd, John; Flood, Edward; Quinlan, Tom; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Bondarczuk, Krzysztof; Maguire, Paul J.; Barry, Liam P.
Abstract:
Suppression of residual single-photon absorption (SPA) relative to two-photon absorption (TPA) in a high finesse GaAs planar microcavity is explored. The TPA photocurrent becomes larger than the SPA photocurrent as long as the incident continuous-wave optical power exceeds 0.09 mW. An optical power of 5 mW would be required if the relative SPA suppression did not exist.
http://doras.dcu.ie/2258/
Marked
Mark
A high-speed optical star network using TDMA and all-optical demultiplexing techniques
(1996)
Barry, Liam P.; Guignard, Celine; Debeau, J.; Boittin, R.; Bernard, M.
A high-speed optical star network using TDMA and all-optical demultiplexing techniques
(1996)
Barry, Liam P.; Guignard, Celine; Debeau, J.; Boittin, R.; Bernard, M.
Abstract:
The authors demonstrate the use of time-division multiplexing (TDM) to realize a high capacity optical star network. The fundamental element of the demonstration network is a 10 ps, wavelength tunable, low jitter, pulse source. Electrical data is encoded onto three optical pulse trains, and the resultant low duty cycle optical data channels are multiplexed together using 25 ps fiber delay lines. This gives an overall network capacity of 40 Gb/s. A nonlinear optical loop mirror (NOLM) is used to carry out the demultiplexing at the station receiver. The channel to be switched out can be selected by adjusting the phase of the electrical signal used to generate the control pulses for the NOLM. By using external injection into a gain-switched distributed feedback (DFB) laser we are able to obtain very low jitter control pulses of 4-ps duration (RMS jitter <1 ps) after compression of the highly chirped gain switched pulses in a normal dispersive fiber. This enables us to achieve excell...
http://doras.dcu.ie/2274/
Marked
Mark
Studies on the gamma-ray burst phenomenon and on its use to probe the high redshift universe
(2009)
Vergani, Susanna D.
Studies on the gamma-ray burst phenomenon and on its use to probe the high redshift universe
(2009)
Vergani, Susanna D.
Abstract:
Gamma-ray bursts (GRBs) are an enigmatic phenomenon whose physics and origins are still to be fully understood. Furthermore, thanks to their exceptional brightness they can be used as a tool to retrieve information on the high redshift universe. In my thesis work, I explore some of the research areas that can be investigated using GRBs. Using the REM observations of GRB060418 and GRB060607, the initial Lorentz factor of the GRB explosion could be measured. The value found for both bursts and the inferred radius at which the forward shock with the external medium took place is in agreement with theoretical predictions. The analysis of the X-ray to-optical spectral energy distribution of 22 GRBs shows that synchrotron emission works well for most afterglows as a simple spectral model, on the other hand the dynamical model of the expansion is difficult to reconcile with the observations. A low dust-to-gas ratio is confirmed. The X-ray radiation during X-ray flares and the initial steep...
http://doras.dcu.ie/2351/
Marked
Mark
Spectroscopic characterisation of high dielectric constant materials on semiconducting surfaces
(2009)
McDonnell, Stephen
Spectroscopic characterisation of high dielectric constant materials on semiconducting surfaces
(2009)
McDonnell, Stephen
Abstract:
In this work, various insulator/semiconductor interfaces on silicon, gallium arsenide (GaAs) and germanium have been studied by photoemission spectroscopy. Where possible, these interfaces were then tested electrically after the formation of capacitor structures. Each system presents its own unique challenges in the drive to the ultimate goal of developing smaller, faster and lower powered devices. On silicon substrates, an in-situ analysis of hafnium oxide grown by micro e-beam deposition in an oxygen atmosphere on an ultra-thin SiO2 buffer layer was carried out using XPS and synchrotron radiation. The self-limiting growth of an interfacial hafnium silicate layer was observed and the substrate temperature during the hafnium oxide depositions was found effect the onset temperature of hafnium silicide formation during post-deposition anneals. Hafnium oxide has also been grown ex-situ on silicon substrates by e-beam deposition in an oxygen atmosphere. The affects of an argon plasma io...
http://doras.dcu.ie/2355/
Marked
Mark
Uncovering long memory in high frequency UK futures
(2004)
Cotter, John
Uncovering long memory in high frequency UK futures
(2004)
Cotter, John
Abstract:
Accurate volatility modelling is paramount for optimal risk management practices. One stylized feature of financial volatility that impacts the modelling process is long memory explored in this paper for alternative risk measures, observed absolute and squared returns for high frequency intraday UK futures. Volatility series for three different asset types, using stock index, interest rate and bond futures are analysed. Long memory is strongest for the bond contract. Long memory is always strongest for the absolute returns series and at a power transformation of k < 1. The long memory findings generally incorporate intraday periodicity. The APARCH model incorporating seven related GARCH processes generally models the futures series adequately documenting ARCH, GARCH and leverage effects.
http://hdl.handle.net/10197/1142
Marked
Mark
A Reconfigurable Platform to drive High Frequency Class S Power Amplifiers using Multi-Gigabit Transceivers
(2008)
Astarloa, Armando; Dooley, John; Canniff, Alan; Farrell, Ronan
A Reconfigurable Platform to drive High Frequency Class S Power Amplifiers using Multi-Gigabit Transceivers
(2008)
Astarloa, Armando; Dooley, John; Canniff, Alan; Farrell, Ronan
Abstract:
In this research work we present a reconfigurable platform that implements all the digital processing and RF carrier generation for the class S Power Amplifier proposed by the Institute of Microelectronics and Wireless Systems. This amplifier is a combination of a lowpass or bandpass sigma-delta modulation stage in series with a frequency shifting stage and a switch mode amplifier followed by a band pass filter. The reconfigurable platform is parameterizable, scalable and it has been optimized for reconfigurable devices. It takes advantage from the Multi-Gigabit serial links embedded into the new FPGAs to synthesize binary RF signals, and from the parameterizable soft cores that the FPGA vendor provides. The implementation results for a stand-alone and for a tiny Wishbone compatible Systemon-Programmable-Chip versions are presented. The design is validated with data measured in the simulation and in the prototype.
http://eprints.nuim.ie/1395/
Marked
Mark
MultiPhyl: a high-throughput phylogenomics webserver using distributed computing
(2007)
Keane, Thomas M.; Naughton, Thomas J.; McInerney, James O.
MultiPhyl: a high-throughput phylogenomics webserver using distributed computing
(2007)
Keane, Thomas M.; Naughton, Thomas J.; McInerney, James O.
Abstract:
With the number of fully sequenced genomes increasing steadily, there is greater interest in performing large-scale phylogenomic analyses from large numbers of individual gene families. Maximum likelihood (ML) has been shown repeatedly to be one of the most accurate methods for phylogenetic construction. Recently, there have been a number of algorithmic improvements in maximum-likelihood-based tree search methods. However, it can still take a long time to analyse the evolutionary history of many gene families using a single computer. Distributed computing refers to a method of combining the computing power of multiple computers in order to perform some larger overall calculation. In this article, we present the first high-throughput implementation of a distributed phylogenetics platform, MultiPhyl, capable of using the idle computational resources of many heterogeneous non-dedicated machines to form a phylogenetics supercomputer. MultiPhyl allows a user to upload hundreds or thousan...
http://eprints.nuim.ie/1304/
Marked
Mark
High-density event-related potentials: Current theories and practice
(2006)
Roche, R.A.P.; Scanlon, P.; Commins, S.
High-density event-related potentials: Current theories and practice
(2006)
Roche, R.A.P.; Scanlon, P.; Commins, S.
Abstract:
Event-Related Potentials (ERPs) are changes in the ongoing electrical activity of the brain (Electroencephalograms, or EEGs) which are caused by the specific occurrence of a cognitive, motor or perceptual event. Any changes in EEG due to the demands of the task are amplified, averaged and extracted as ERP waveforms (see Figure 1). These wave-forms are measured as the difference between the electrical activity of a baseline reference electrode attached to an electrically inactive site, such as the mastoid bone below the ear or the naison on the nose, and the electrical activity of the areas of the brain covered by the electrodes. These changes allow neuroscientists to determine what areas of brain are being stimulated at a given time (and therefore which brain areas are involved in a given process), precisely when these areas become activated and what happens in these areas when people make an error.
http://eprints.nuim.ie/1019/
Marked
Mark
A high-throughput bioinformatics distributed computing platform
(2005)
Keane, Thomas M.; Page, Andrew J.; McInerney, James O.; Naughton, Thomas J.
A high-throughput bioinformatics distributed computing platform
(2005)
Keane, Thomas M.; Page, Andrew J.; McInerney, James O.; Naughton, Thomas J.
Abstract:
In the past number of years the demand for high performance computing has greatly increased in the area of bioinformatics. The huge increase in size of many genomic databases has meant that many common tasks in bioinformatics are not possible to complete in a reasonable amount of time on a single processor. Recently distributed computing has emerged as an inexpensive alternative to dedicated parallel computing. We have developed a general-purpose distributed computing platform that is capable of using semi-idle computing resources to simulate a dedicated computing cluster. We have identified the suitability of a number of bioinformatics tasks to distributed computing. We briefly outline and evaluate two distributed bioinformatics programs, DSEARCH and DPRml, which have been developed for our system.
http://eprints.nuim.ie/234/
Marked
Mark
Modelling and Design of High-Order Phase Locked Loops
(2005)
Modelling and Design of High-Order Phase Locked Loops
(2005)
Abstract:
In this paper a new stable high order Digital Phase Lock Loop (DPLL) design technique is proposed. This technique uses linear theory to design the DPLL. The stability of the DPLL is guaranteed by placing a restriction on the system gain. This stability boundary is found by transforming the system transfer function to the Z-domain and plotting the root locus of the LPLL for values of gain where all the system poles lie inside the unit circle. The max value of gain where all the poles lie inside the unit circle is the stability boundary. It is shown that the stability boundary of the LPLL is comparable to the stability boundary of the DPLL. Finally where the above Bessel filter system produces slow lock, gear shifting of the DPLL components is considered. This allows the DPLL to start off with a wide loop bandwidth and switch to the narrow bandwidth once the system has locked.
http://eprints.nuim.ie/575/
Marked
Mark
A Multi-Mode Video Driver for a High Resolution LCoS Display
(2000)
Farrell, Ronan; Jacob, Mark; Maher, Roger
A Multi-Mode Video Driver for a High Resolution LCoS Display
(2000)
Farrell, Ronan; Jacob, Mark; Maher, Roger
Abstract:
This paper describes the design of a display driver for Liquid Crystal on Silicon (LCoS) microdisplays. These are high resolution reflective display devices which allow up to 1280x1024 pixels on an area of 3.75cm2, and are typically refreshed at 120Hz. The required driver consists of a digital section capable of taking the common display formats such as SVGA and new formats, SXGA, and processing these to a common 120HzRGB signal, requiring an output rate of 160 mega-pixels/second. This signal is then converted to a 10 bit accurate analog current which, when amplified, controls the LCoS device. This paper will discuss the new features added in the digital domain and the challenges of third-party IP integration of analog components.
http://eprints.nuim.ie/596/
Marked
Mark
High Auality Time-scale Modification of Speech using a Peak Alignment Overlap-add Alogroithm (PAOLA)
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
High Auality Time-scale Modification of Speech using a Peak Alignment Overlap-add Alogroithm (PAOLA)
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
<p>The duration of a speech passage can be altered using audio time-scale modification techniques. Time-scale modification can be achieved in the time domain by segmenting the input signal into overlapping frames and recombining the frames with an overlap differing from the analysis overlap. We present a time-scale modification algorithm that uses a simple peak alignment technique to synchronise overlapping synthesis frames. The peak alignment overlap-add (Paola) algorithm also takes advantage of waveform properties to ensure a high quality output for the minimum number of iterations. The new algorithm produces a time-scaled output of approximately equal quality to that of an adaptive implementation of the commercially popular synchonised overlap-add (SOLA) algorithm, but offers a computational saving ranging from a factor of 15 (for a time-scale factor of 0.5) to 170 (for a time-scale factor of 1.1)</p>
http://arrow.dit.ie/argcon/34
Marked
Mark
An Experimental Investigation of TCP Performance in High Bandwidth-Delay Product Paths.
(2007)
Even, Baruch
An Experimental Investigation of TCP Performance in High Bandwidth-Delay Product Paths.
(2007)
Even, Baruch
Abstract:
The performance of the Internet is determined not only by the network and hardware technologies that underlie it, but also by the software protocols that govern its use. In particular, the TCP transport protocol is responsible for carrying the great majority of traffic in the current internet, including web traffic, email, file transfers, music and video downloads. TCP provides two main functions. First, it provides functionality to detect and retransmit packets lost during a transfer thereby providing a reliable transport service to higher layer applications. Second, it enforces congestion control. That is, it seeks to match the rate at which packets are injected into the network to the available network capacity. A particular aim here is to avoid so-called congestion collapse, prevalent in the late 1980s prior to the inclusion of congestion control functionality in TCP. Over the last decade or so, the link speeds within networks have increased by several orders of magnitude. While...
http://eprints.nuim.ie/1743/
Marked
Mark
Experimental evaluation of TCP protocols for high-speed networks
(2007)
Li, Yee-Ting; Leith, Douglas J. ; Shorten, Robert N.
Experimental evaluation of TCP protocols for high-speed networks
(2007)
Li, Yee-Ting; Leith, Douglas J. ; Shorten, Robert N.
Abstract:
In this paper, we present experimental results evaluating the performance of the scalable-TCP, HS-TCP, BIC-TCP, FAST-TCP, and H-TCP proposals in a series of benchmark tests. In summary, we find that both Scalable-TCP and FAST-TCP consistently exhibit substantial unfairness, even when competing flows share identical network path characteristics. Scalable-TCP, HS-TCP, FAST-TCP, and BIC-TCP all exhibit much greater RTT unfairness than does standard TCP, to the extent that long RTT flows may be completely starved of bandwidth. Scalable-TCP, HS-TCP, and BIC-TCP all exhibit slow convergence and sustained unfairness following changes in network conditions such as the start-up of a new flow. FAST-TCP exhibits complex convergence behavior.
http://eprints.nuim.ie/1726/
Marked
Mark
Evaluating the Performance of TCP Stacks for High-Speed Networks.
(2006)
Even, B.; Li, Y.; Leith, D. J.
Evaluating the Performance of TCP Stacks for High-Speed Networks.
(2006)
Even, B.; Li, Y.; Leith, D. J.
Abstract:
In this paper we present experimental results evaluating the performance of the Scalable-TCP, HS-TCP, BICTCP, FAST-TCP and H-TCP proposals for changes to the TCP congestion control algorithm to improve performance in highspeed network paths.
http://eprints.nuim.ie/1781/
Marked
Mark
Dissociation in performance of children with ADHD and high-functioning autism on a task of sustained attention.
(2007)
GALLAGHER, LOUISE; GILL, MICHAEL; JOHNSON, KATHERINE ANNE; ROBERTSON, IAN
Dissociation in performance of children with ADHD and high-functioning autism on a task of sustained attention.
(2007)
GALLAGHER, LOUISE; GILL, MICHAEL; JOHNSON, KATHERINE ANNE; ROBERTSON, IAN
Abstract:
peer-reviewed
Attention deficit hyperactivity disorder (ADHD) and autism are two neurodevelopmental disorders associated with prominent executive dysfunction, which may be underpinned by disruption within fronto-striatal and fronto-parietal circuits. We probed executive function in these disorders using a sustained attention task with a validated brain-behaviour basis. Twenty-three children with ADHD, 21 children with high-functioning autism (HFA) and 18 control children were tested on the Sustained Attention to Response Task (SART). In a fixed sequence version of the task, children were required to withhold their response to a predictably occurring no-go target (3) in a 1–9 digit sequence; in the random version the sequence was unpredictable. The ADHD group showed clear deficits in response inhibition and sustained attention, through higher errors of commission and omission on both SART versions. The HFA group showed no sustained attention deficits, through a normal number of o...
http://hdl.handle.net/2262/34989
Marked
Mark
Maternal vitamin B12 status and risk of neural tube defects in a population with high neural tube defect prevalence and no folic Acid fortification
(2009)
MOLLOY, ANNE MARIE; SCOTT, JOHN MARTIN
Maternal vitamin B12 status and risk of neural tube defects in a population with high neural tube defect prevalence and no folic Acid fortification
(2009)
MOLLOY, ANNE MARIE; SCOTT, JOHN MARTIN
Abstract:
peer-reviewed
OBJECTIVE. Folic acid fortification has reduced neural tube defect prevalence by 50% to 70%. It is unlikely that fortification levels will be increased to reduce neural tube defect prevalence further. Therefore, it is important to identify other modifiable risk factors. Vitamin B12 is metabolically related to folate; moreover, previous studies have found low B12 status in mothers of children affected by neural tube defect. Our objective was to quantify the effect of low B12 status on neural tube defect risk in a high-prevalence, unfortified population. METHODS. We assessed pregnancy vitamin B12 status concentrations in blood samples taken at an average of 15 weeks’ gestation from 3 independent nested case-control groups of Irish women within population-based cohorts, at a time when vitamin supplementation or food fortification was rare. Group 1 blood samples were from 95 women during a neural tube defect–affected pregnancy and 265 control subjects. Group 2 include...
http://hdl.handle.net/2262/34511
Marked
Mark
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(2006)
HARPER, GRAHAM
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(2006)
HARPER, GRAHAM
Abstract:
peer-reviewed
The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for example, evidence of a water envelope (MOLsphere) that in some studies is found to be optically thick in the mid-infrared. In this paper, we present high-resolution, mid-infrared spectra of Betelgeuse recorded with the TEXES spectrograph. The spectra clearly show absorption features of water vapor and OH. We show that a spectrum based on a spherical, hydrostatic model photosphere with Teff = 3600 K, an effective temperature often assumed for Betelgeuse, fails to model the observed lines. Furthermore, we show that published MOLspheres scenarios are unable to explain our data. However, we are able to model the observed spectrum reasonably well by adopting a cooler outer photospheric structure corresponding to Tmod = 3250 K. The success of this model m...
http://hdl.handle.net/2262/33130
Marked
Mark
Conical diffraction and Bessel beam formation with a high optical quality biaxial crystal
(2009)
DONEGAN, JOHN FRANCIS; LUNNEY, JAMES GERARD; RAKOVICH, YURY
Conical diffraction and Bessel beam formation with a high optical quality biaxial crystal
(2009)
DONEGAN, JOHN FRANCIS; LUNNEY, JAMES GERARD; RAKOVICH, YURY
Abstract:
peer-reviewed
The manipulation of a Gaussian laser beam using conical diffraction in a high optical quality biaxial crystal of KGd(WO4)2 has been examined in detail with emphasis on the experimental techniques involved and intuitive explanations of the notable features. Two different optical arrangements were used to form the Pogendorff double-ring light pattern in the focal image plane. The formation of both diverging and non-diverging zeroth and first order Bessel beams was investigated. The various intensity distributions and polarization properties were measured and compared with the predictions of well-established theory.
http://hdl.handle.net/2262/33026
Marked
Mark
A thermal-hydraulic comparison of liquid microchannel and impinging liquid jet array heat sinks for high power electronics cooling
(2009)
ROBINSON, ANTHONY
A thermal-hydraulic comparison of liquid microchannel and impinging liquid jet array heat sinks for high power electronics cooling
(2009)
ROBINSON, ANTHONY
Abstract:
peer-reviewed
In this paper, two single-phase liquid cooling strategies for electronics thermal management are compared and contrasted; impinging jet arrays and laminar flow in microchannels. The comparison is posed for a situation in which an electronic device must dissipate 250 W/cm while being maintained at a temperature of 85 C. The calculations indicate that both the impinging jet and microchannel heat sinks can provide the necessary cooling with less than 0.1Wof pumping power. Microchannels achieve this heat transfer target with such low pumping power by the relatively high pressure drop being offset by a low volumetric flow rate. In contrast, impinging jet heat sinks require a lower pressure drop and higher volumetric flow rate. From a practical point of view, lower operating pressure and larger mass flow rates are desirable characteristics, since they will be less prone to leakage and will provide better temperature uniformity across the heated component.
http://hdl.handle.net/2262/31928
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