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Displaying Results 176 - 200 of 2052 on page 8 of 83
Marked
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Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying
(2010)
Pathare, Pankaj B.
Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying
(2010)
Pathare, Pankaj B.
Abstract:
Ireland. Dept. of Agriculture, Fisheries & Food (FIRM)
Accepted Version
This study has considered the optimisation of granola breakfast cereal manufacturing processes by wet granulation and pneumatic conveying. Granola is an aggregated food product used as a breakfast cereal and in cereal bars. Processing of granola involves mixing the dry ingredients (typically oats, nuts, etc.) followed by the addition of a binder which can contain honey, water and/or oil. In this work, the design and operation of two parallel wet granulation processes to produce aggregate granola products were incorporated: a) a high shear mixing granulation process followed by drying/toasting in an oven. b) a continuous fluidised bed followed by drying/toasting in an oven. In high shear granulation the influence of process parameters on key granule aggregate quality attributes such as granule size distribution and textural properties of granola were investigated. The experimental results show that th...
http://hdl.handle.net/10468/397
Marked
Mark
Multiwavelength Observations of the VHE Blazar 1ES 2344+514
(2011)
Lang, Mark; Gillanders, Gary
Multiwavelength Observations of the VHE Blazar 1ES 2344+514
(2011)
Lang, Mark; Gillanders, Gary
Abstract:
Multiwavelength observations of the high-frequency-peaked blazar 1ES2344+514 were performed from 2007 October to 2008 January. The campaign represents the first contemporaneous data on the object at very high energy (VHE, E >100 GeV) {\gamma}-ray, X-ray, and UV energies. Observations with VERITAS in VHE {\gamma}-rays yield a strong detection of 20 {\sigma} with 633 excess events in a total exposure of 18.1 hours live-time. A strong VHE {\gamma}-ray flare on 2007 December 7 is measured at F(>300 GeV) = (6.76 \pm 0.62) \times 10-11 ph cm-2 s-1, corresponding to 48% of the Crab Nebula flux. Excluding this flaring episode, nightly variability at lower fluxes is observed with a time-averaged mean of F(>300 GeV) = (1.06 \pm 0.09) \times 10-11 ph cm-2 s-1 (7.6% of the Crab Nebula flux). The differential photon spectrum between 390 GeV and 8.3 TeV for the time-averaged observations excluding 2007 December 7 is well described by a power law with a photon index of {\Gamma...
http://hdl.handle.net/10379/2508
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Identifying high perceived value practices of CMMI level 2: An empirical study
(2012)
Niazi, Mahmood; Ali Babar, Muhammad
Identifying high perceived value practices of CMMI level 2: An empirical study
(2012)
Niazi, Mahmood; Ali Babar, Muhammad
Abstract:
Objective: In this paper, we present findings from an empirical study that was aimed at identifying the lative ‘‘perceived value” of CMMI level 2 specific practices based on the perceptions and experiences of practitioners of small and medium size companies. The objective of this study is to identify the extent to which a particular CMMI practice is used in order to develop a finer-grained framework, which encompasses the notion of perceived value within specific practices. Method: We used face-to-face questionnaire based survey sessions as the main approach to collecting data from 46 software development practitioners from Malaysia and Vietnam. We asked practitioners to choose and rank CMMI level 2 practices against the five types of assessments (high, medium, low, zero or do not know). From this, we have proposed the notion of ‘perceived value’ associated with each practice. Results: We have identified three ‘requirements management’ practices as having a ‘high perceived value’....
http://hdl.handle.net/10344/2097
Marked
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High-Sensitivity PCR Detection of Parvovirus B19 Plasma
(2002)
Doyle, Sean; Mahon, Bernard; Corcoran, A.; Daly, P.
High-Sensitivity PCR Detection of Parvovirus B19 Plasma
(2002)
Doyle, Sean; Mahon, Bernard; Corcoran, A.; Daly, P.
Abstract:
Parvovirus B19 (B19) is a human pathogen transmitted to susceptible individuals via respiratory secretions and contaminated blood or blood products. B19 levels in pooled plasma of less than 104 genome equivalents/ml may not be infectious, while those greater than 107/ml are capable of transmitting infection. A World Health Organization (WHO) B19 DNA international standard has been recently introduced. The purpose of the present work was to develop a PCR-enzyme-linked immunosorbent assay (PCR-ELISA) calibrated against the WHO B19 DNA international standard which could easily and reliably detect B19 DNA levels in plasma above 104 IU/ml (6.5 103 genome equivalents/ml). A B19 PCR-ELISA system was developed which uses a dinitrophenylated oligonucleotide probe to detect immobilized biotinylated amplicons following single-round PCR amplification. The level of B19 DNA (in international units per milliliter) in individual and pooled plasma specimens was evaluated. Proteinase K treatment of ...
http://eprints.nuim.ie/162/
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An experiment for two-color photoionization using high intensity extreme-UV free electron and near-IR laser pulses
(2007)
Radcliffe, P.; Düsterer, S.; Azima, A.; Li, W.B.; Plönjes, E.; Redlin, H.; Feldhaus, J....
An experiment for two-color photoionization using high intensity extreme-UV free electron and near-IR laser pulses
(2007)
Radcliffe, P.; Düsterer, S.; Azima, A.; Li, W.B.; Plönjes, E.; Redlin, H.; Feldhaus, J.; Nicolosi, P.; Poletto, L.; Dardis, John; Pedregosa-Gutierrez, Jofre; Hough, Pádraig; Kavanagh, Kevin D.; Kennedy, Eugene T.; Luna, H.; Yeates, Pat; Costello, John T.; Delyseries, A.; Lewis, C.L.S.; Glijer, D.
Abstract:
We describe an experimental system designed for single-shot photoelectron spectroscopy on free atoms and molecules at the Free Electron Laser in Hamburg (FLASH at DESY). The combination of the extreme ultra-violet (EUV) Free Electron Laser and a temporally synchronized optical fs laser (Ti:Sapphire) enables a variety of two-color pump-probe experiments. The spectral, temporal and spatial characteristics of both the EUV FEL and the optical laser pulses, the experimental procedure to control their overlap as well as the performance of an electron spectrometer used to obtain single-shot photoelectron spectra are discussed. As an illustration of the capabilities of this set-up, some results on two-photon two-color ionization of rare gases are presented.
http://doras.dcu.ie/100/
Marked
Mark
Simulation of a high-speed demultiplexer based on two-photon absorption in semiconductor devices
(2005)
Maguire, Paul J.; Barry, Liam P.; Krug, T.; Bradley, Ann Louise; Donegan, John Francis;...
Simulation of a high-speed demultiplexer based on two-photon absorption in semiconductor devices
(2005)
Maguire, Paul J.; Barry, Liam P.; Krug, T.; Bradley, Ann Louise; Donegan, John Francis; Folliot, H.
Abstract:
In this paper, we present a theoretical model of an all-optical demultiplexer based on two-photon absorption in a specially designed semiconductor micro-cavity for use in an optical time division multiplexed system. We show that it is possible to achieve error-free demultiplexing of a 250 Gbit/s OTDM signal (25 × 10 Gbit/s channels) using a control-to-signal peak pulse power ratios of around 30:1 with a device bandwidth of approximately 30 GHz.
http://doras.dcu.ie/122/
Marked
Mark
High-sensitivity two-photon absorption microcavity autocorrelator
(2004)
Krug, T.; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Barry, Liam P.; F...
High-sensitivity two-photon absorption microcavity autocorrelator
(2004)
Krug, T.; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Barry, Liam P.; Folliot, H.; Roberts, J.S.; Hill, G.
Abstract:
A GaAs-AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5-/spl mu/m optical pulses. Enhancement of the two-photon absorption photocurrent due to the microcavity structure results in an autocorrelation (average power times peak power) sensitivity of 9.3/spl times/10/sup -4/ (mW)/sup 2/, which represents two orders of magnitude improvement when compared with conventional autocorrelators.
http://doras.dcu.ie/173/
Marked
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Characterization of 40-Gbit/s pulses generated using a lithium niobate modulator at 1550 nm using frequency resolved optical gating
(2004)
Thomsen, Benn C.; Reid, Douglas A.; Watts, Regan T.; Barry, Liam P.; Harvey, John D.
Characterization of 40-Gbit/s pulses generated using a lithium niobate modulator at 1550 nm using frequency resolved optical gating
(2004)
Thomsen, Benn C.; Reid, Douglas A.; Watts, Regan T.; Barry, Liam P.; Harvey, John D.
Abstract:
The characteristics of 40-Gbit/s pulses generated by exploiting the nonlinear characteristics of a Mach-Zender Lithium Niobate modulator are presented. A high spectral resolution frequency resolved optical gating apparatus has been developed to allow for the complete characterization of the intensity and phase of these pulses. The use of these measurements to simplify the design and optimization of an 80-Gbit/s pulse source, based on this 40-Gbit/s source followed by a nonlinear fiber compressor and multiplexer, is also demonstrated.
http://doras.dcu.ie/176/
Marked
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Synchrotron x-ray topographic and high-resolution diffraction analysis of mask-induced strain in epitaxial laterally overgrown GaAs layers
(1999)
Rantamäki, R.; Tuomi, T.; Zytkiewicz, Z.R.; Domagala, J.; McNally, Patrick J.
Synchrotron x-ray topographic and high-resolution diffraction analysis of mask-induced strain in epitaxial laterally overgrown GaAs layers
(1999)
Rantamäki, R.; Tuomi, T.; Zytkiewicz, Z.R.; Domagala, J.; McNally, Patrick J.
Abstract:
Synchrotron x-ray back reflection section topographs of epitaxial lateral overgrown (ELO) GaAs samples grown on (001) GaAs substrates show images of the GaAs layers bent due to the interaction between the layer and the SiO2 mask. The topographs are simulated under the assumption of orientational contrast. Using the same data the measured x-ray diffraction curve is simulated. The calculations, which are in good agreement with the measurements, are used to gain information on the tilted (001) lattice planes in each ELO layer. We show that the bending of ELO lattice planes reaches a maximum at the center of the ELO stripes, where misorientation is at a minimum, and decreases towards the edges of the stripes, where misorientation reaches a maximum.
http://doras.dcu.ie/201/
Marked
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Characterization of a turbo-switch SOA wavelength converter using spectrographic pulse measurement
(2008)
Reid, Douglas A.; Clarke, Aisling M.; Yang, Xuelin; Maher, Robert D.; Webb, R.P.; Manni...
Characterization of a turbo-switch SOA wavelength converter using spectrographic pulse measurement
(2008)
Reid, Douglas A.; Clarke, Aisling M.; Yang, Xuelin; Maher, Robert D.; Webb, R.P.; Manning, R.J.; Barry, Liam P.
Abstract:
We use the frequency-resolved optical gating (FROG) technique to determine the pulsewidth and chirp characteristics of wavelength-converted pulses from a turbo-switch and asymmetrical Mach-Zehnder filter combination under a variety of operating conditions. The output pulses were found to be near transform limited and had a high tolerance to line rate and input power variations.
http://doras.dcu.ie/2260/
Marked
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Dispersion monitoring for high-speed WDM networks via two-photon absorption in a semiconductor microcavity
(2006)
Maguire, Paul J.; Bondarczuk, Krzysztof; Barry, Liam P.; O'Dowd, John; Guo, Wei Hu...
Dispersion monitoring for high-speed WDM networks via two-photon absorption in a semiconductor microcavity
(2006)
Maguire, Paul J.; Bondarczuk, Krzysztof; Barry, Liam P.; O'Dowd, John; Guo, Wei Hua; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Folliot, H.
Abstract:
Due to the continued demand for bandwidth, network operators have to increase the data rates at which individual wavelengths operate at. As these data rates will exceed 100 Gbit/s in the next 5-10 years, it will be crucial to be able to monitor and compensate for the amount of chromatic dispersion encountered by individual wavelength channels. This paper will focus on the use of the novel nonlinear optical-to-electrical conversion process of two-photon absorption (TPA) for dispersion monitoring. By incorporating a specially designed semiconductor microcavity, the TPA response becomes wavelength dependent, thus allowing simultaneous channel selection and monitoring without the need for external wavelength filtering
http://doras.dcu.ie/2286/
Marked
Mark
Simulation of all-optical demultiplexing utilizing two-photon absorption in semiconductor devices for high-speed OTDM networks
(2004)
Maguire, Paul J.; Barry, Liam P.
Simulation of all-optical demultiplexing utilizing two-photon absorption in semiconductor devices for high-speed OTDM networks
(2004)
Maguire, Paul J.; Barry, Liam P.
Abstract:
The performance of a two-photon absorption (TPA) based demultiplexer in an OTDM communication system is modeled. The demultiplexer is evaluated by comparing the electrical BER of the demultiplexed and detected channel to the optical BER of the signal before the demultiplexer. An error-free demultiplexing of a 250 Gbit/s signal (25 × 10 Gbit/s channels) is shown, using a 30:1 control-to-signal peak power ratio, with a TPA device with a bandwidth of 20 GHz should be possible. The device that is fabricated for TPA is a GaAs/AlAs PIN microcavity photodetector grown on a GaAs substrate.
http://doras.dcu.ie/2290/
Marked
Mark
Dispersion insensitive, high-speed optical clock recovery based on a mode-locked laser diode
(2008)
Maguire, Paul J.; Reid, Douglas A.; Barry, Liam P.; O'Hare, A.; Lobo, S.; Roncin, ...
Dispersion insensitive, high-speed optical clock recovery based on a mode-locked laser diode
(2008)
Maguire, Paul J.; Reid, Douglas A.; Barry, Liam P.; O'Hare, A.; Lobo, S.; Roncin, V.; Gay, M.; Bramerie, Laurent; Simon, Jean Claude
Abstract:
An investigation into the effects of varying levels of chromatic dispersion on a mode- locked laser diode optical clock recovery process is presented. Results demonstrate that this technique is invariant to input dispersion varying between +75 ps/nm.
http://doras.dcu.ie/2299/
Marked
Mark
Design and fabrication of highly efficient non-linear optical devices for implementing high-speed optical processing
(2002)
Barry, Liam P.; Krug, T.; Folliot, H.; Lynch, Michael; Bradley, Ann Louise; Donegan, Jo...
Design and fabrication of highly efficient non-linear optical devices for implementing high-speed optical processing
(2002)
Barry, Liam P.; Krug, T.; Folliot, H.; Lynch, Michael; Bradley, Ann Louise; Donegan, John Francis; Roberts, J.S.; Hill, G.
Abstract:
We present the design and fabrication of micro-cavity semiconductor devices for enhanced Two-Photon-Absorption response, and demonstrate the use of these devices for implementing sensitive autocorrelation measurements on pico-second optical pulses.
http://doras.dcu.ie/2323/
Marked
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High performance liquid chromatography-tandem mass spectrometry of pharmaceuticals and personal care products in environmental and biological matrices
(2009)
Purcell, Martha
High performance liquid chromatography-tandem mass spectrometry of pharmaceuticals and personal care products in environmental and biological matrices
(2009)
Purcell, Martha
Abstract:
Pharmaceuticals and personal care products (PPCPs) have emerged in recent years as a new class of chemical and biological pollutants in our environment. In the search for suitably sensitive and specific techniques for detection of these compounds at very low concentrations, liquid chromatography-tandem mass spectrometry (LCMS/ MS) has emerged as the new technique of choice. This work describes methods for screening and quantification of various pharmaceutical and illicit drug residues in solid and liquid environmental and biological matrices. Particular focus was given to efficiency of chosen stationary phase, sample preparation procedures and matrix effects which seriously affect the accuracy of LC-MS/MS measurements. An analytical method was developed for the analysis of a range of illicit drugs in hair samples. The solid phase extraction procedure was optimised by comparison of the extraction efficiency of a range of commercially available cartridges. The method was validated and...
http://doras.dcu.ie/2343/
Marked
Mark
On highly oscillatory problems arising in electronic engineering
(2009)
Condon, Marissa; Deaño, Alfredo; Iserles, Arieh
On highly oscillatory problems arising in electronic engineering
(2009)
Condon, Marissa; Deaño, Alfredo; Iserles, Arieh
Abstract:
In this paper, we consider linear ordinary differential equations originating in electronic engineering, which exhibit exceedingly rapid oscillation. Moreover, the oscillation model is completely different from the familiar framework of asymptotic analysis of highly oscillatory integrals. Using a Bessel-function identity, we expand the oscillator into asymptotic series, and this allows us to extend Filon-type approach to this setting. The outcome is a time-stepping method that guarantees high accuracy regardless of the rate of oscillation.
http://doras.dcu.ie/4698/
Marked
Mark
Structural and electrical characterisation of ion-implanted strained silicon
(2008)
Horan, Ken; Lankinen, Aapo; O'Reilly, Lisa; Bennett, N.S.; McNally, Patrick J.; Se...
Structural and electrical characterisation of ion-implanted strained silicon
(2008)
Horan, Ken; Lankinen, Aapo; O'Reilly, Lisa; Bennett, N.S.; McNally, Patrick J.; Sealy, B.J.; Cowern, N.E.B.; Tuomi, T.
Abstract:
The production of low resistance ultra-shallow junctions for e.g. source/drain extensions using low energy ion-implantation will be required for future CMOS devices [1]. This architecture will require implants which demonstrate high electrical activation and nm range depth profiles. We investigate the properties of Sb implants in tensile strained silicon due to their potential to satisfy these criteria, and the carrier mobility enhancements associated with tensile strained silicon. Low energy (in this case 2 keV)implants coupled with Sb’s large atomic radius are capable of providing ~ 10 nm implant depths. In addition to this, Sb, in the presence of tensile strain demonstrates higher electrical activation when compared with the more traditional n-type dopant As [2]. We now report on the initial results of an ongoing systematic study over a wide silicon tensile strain range (from 0.4 to 1.25 % strain) in order to establish clear strain-related trends. Graded Si1-xGex virtual substrat...
http://doras.dcu.ie/4716/
Marked
Mark
9.1 dBm IIP3 36 dB GAIN CONTROLLABLE LNA FOR WCDMA IN 0.13-m CMOS
(2009)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang
9.1 dBm IIP3 36 dB GAIN CONTROLLABLE LNA FOR WCDMA IN 0.13-m CMOS
(2009)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang
Abstract:
This article presents a low-power, high-linearity cascodetype low noise amplifier (LNA) with 36 dB of variable gain for the WIDE Code Division Multiple Access systems. By enhancing the substrate resistance of a common gate transistor along with adopting multiple-gate technique, the linearity is significantly improved. Shunt-current steering is adopted for smooth gain control. Step gain mode is used to further increase the gain control range. The main common source transistor is disabled in attenuation mode, saving unwanted power consumption. Measurements show maximum gain of 12.3 dB with S11 of 19.5 dB, and S22 of 14 dB. The total gain control range is 36 dB. NF is measured as 2 dB and two-tone test shows 9.1 dBm of IIP3. Implemented in 0.13-m CMOS technology, the LNA consumes only 1.6 mA at maximum gain mode and only 0.2 mA in attenuation mode from 1.2 V supply. Its die size is 0.3 mm2. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1385–1388, 2009; Published online ...
http://eprints.nuim.ie/1460/
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Neural correlates of source memory are revealed by a high density ERPs array
(2006)
Roche, R.A.P.; Scanlon, P.; Moore, J.L.; Murphy, J.; Commins, S.; Dockree, P.M.; Jacoby...
Neural correlates of source memory are revealed by a high density ERPs array
(2006)
Roche, R.A.P.; Scanlon, P.; Moore, J.L.; Murphy, J.; Commins, S.; Dockree, P.M.; Jacoby, L.L.
Abstract:
Failures of source memory, which is the ability to recall the specific context in which events took place, have been associated with cognitive decline in the elderly. Source memory deficits appear to be more indicative of age-related memory impairment than disruption of item memory.
http://eprints.nuim.ie/1014/
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A Pipeline Voltage-To-Time Converter for High Resolution Signal Extraction Off-Chip
(2005)
Hogan, John; Farrell, Ronan
A Pipeline Voltage-To-Time Converter for High Resolution Signal Extraction Off-Chip
(2005)
Hogan, John; Farrell, Ronan
Abstract:
In this paper a pipelined voltage to time converter is presented. It is targeted at the extraction, in digital form, of sensitive analog signals from an integrated circuit. The tester is able to measure the period of this signal and derive the original voltage. The input signal is low frequency. This paper provides solutions to the main challenges in implementing this modulator and how it may be integrated with a digital tester.
http://eprints.nuim.ie/580/
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Discontentment and knowledge spillovers in an emerging high-tech industry: a study of the emergence of the RFID industry
(2009)
Finn, David J.
Discontentment and knowledge spillovers in an emerging high-tech industry: a study of the emergence of the RFID industry
(2009)
Finn, David J.
Abstract:
This thesis is an inductive study of how entrepreneurs and their collaborators use or encourage knowledge spillovers to fuel technological innovations during the emergence of a knowledge intensive industry. Drawing on theories of the entrepreneurial process, innovation during industry emergence, and knowledge spillovers, this thesis seeks to explain the process by which entrepreneurs, facing market, organizational and technological uncertainty, use their existing knowledge to procure, share and create new knowledge during the early stages of an emerging industry. The core research question is why, when and how do knowledge spillovers occur in an emerging industry? The thesis is based on an extensive case study of the RFID (Radio Frequency Identification) industry, including both interview data and analysis of patent data. The approach of data collection, analysis and theory development follows the systematic methodology articulated by Glaser and Strauss (1967), Glaser (1992) and Str...
http://doras.dcu.ie/14832/
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An Investigation of the Safety of High Risk Sandwich Bar Foods Through the Application of Microbial Analysis, Temperature Monitoring and Microbial Predictive Modelling
(2002)
Maher, Marie-Clare, (Thesis)
An Investigation of the Safety of High Risk Sandwich Bar Foods Through the Application of Microbial Analysis, Temperature Monitoring and Microbial Predictive Modelling
(2002)
Maher, Marie-Clare, (Thesis)
Abstract:
<p>Rising incidents of food poisoning may be related to growing evidence of unsatisfactory temperature and hygiene practices in preparing and storing ready-to-eat foods. Four sandwich bar outlets in Dublin city center were observed regarding the quality of food handling and storage practices of chilled vacuum packed cooked chicken breast. A pilot microbial sampling plan proved Staphylococcus aureus was the major microorganism of concern. Microbial counts revealed a S. aureus count of ) cfu/g on chicken straight form the vacuum pack and a count of 10(3)-10(4) cfu/g after handling/preparation (cutting, slicing and blending) had occurred. This compared poorly to the upper satisfactory limit of 10(2)-10(4) cfu/g. a full temperature history of the chill-display units showed fluctuations between 6-12°C, when the recommended temperature is -1 to +5°C. The potential of microbial predictive modelling was also investigated to asses the outlets degree of safety in the operating systems. ...
http://arrow.dit.ie/tourmas/9
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High-speed electronic speckle pattern interferometry
(2004)
Armstrong, Carol, (Thesis)
High-speed electronic speckle pattern interferometry
(2004)
Armstrong, Carol, (Thesis)
Abstract:
<p>Electronic Speckle Pattern Interferometry (ESPI) is used to measure surface displacements. Phase shifting can be used to obtain a fringe pattern which depicts the phase at every point in an image. Previous studies have used algorithms such as the 4-bucket algorithm to obtain phase maps of objects. After the object is displaced a second phase map is obtained in the same way and by correlation the phase difference due to the displacement can be determined. When the object is in rapid continuous motion these algorithms cannot be used. Towards this end a 5-frame algorithm was written, in which the calibrated phase steps are obtained when the surface is at rest and an array of images are grabbed when the object is in motion at high speed. Any one of these images can then be used as the fifth image in the algorithm, thus allowing for calculation of phase change at any pixel at any instant of the motion of the surface The entire process is automated using labVIEW software, which w...
http://arrow.dit.ie/scienmas/3
Marked
Mark
Printed Band-rejection UWB Antenna with H-shaped Slot
(2007)
Bao, Xiulong; Ammann, Max
Printed Band-rejection UWB Antenna with H-shaped Slot
(2007)
Bao, Xiulong; Ammann, Max
Abstract:
<p>The development of the high data rate wireless communication systems, has placed significant demands on antenna designers, in particular, the requirement for smaller elements with broader bandwidths. In this paper, a novel UWB antenna with notch-band frequency is studied. Effects of the various parameters for antenna performances are also discussed. An optimized compact UWB antenna with notch-frequency function is fabricated and experimentally examined. The measured results show the proposed UWB antenna can achieve a return loss greater than 10 db over an ultrawide bandwidth, of 9.8 GHz, from 2.97 GHz to 12.77 GHz with a tunable notch-frequency band of 5.15 GHz to 5.825 GHz</p>
http://arrow.dit.ie/engschececon/37
Marked
Mark
High Quality Millimeter Wave Generation via Stimulated Brillouin Scattering
(2007)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Sch...
High Quality Millimeter Wave Generation via Stimulated Brillouin Scattering
(2007)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Schwarzbacher, Andreas
Abstract:
<p>A new and simple method for the generation and modulation of Millimeter waves is presented. Based on frequency upconversion via Stimulated Brillouin Scattering, it is very flexible in its output frequency and modulation bandwidth.</p>
http://arrow.dit.ie/engschececon/35
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