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Cuardach Reatha:
'physics' i gach réimse;
3195 míreanna faighte
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Ag Taispeaint Torthaí 226 - 250 de 3195 ar leathanach 10 de 128
Marcáilte
Marcáil
Silicon-based resonant-cavity-enchanced photodiode with a buried SiO2 reflector
(1999)
Sinnis, Vasileios S.; Seto, M.; 't Hooft, G. W.; Watabe, Y.; Morrison, Alan P.; Ho...
Silicon-based resonant-cavity-enchanced photodiode with a buried SiO2 reflector
(1999)
Sinnis, Vasileios S.; Seto, M.; 't Hooft, G. W.; Watabe, Y.; Morrison, Alan P.; Hoekstra, W.; de Boer, W. B.
Achomaireacht:
We report on a silicon-based resonant cavity photodiode with a buried silicon dioxide layer as the bottom reflector. The buried oxide is created by using a separation by implantation of oxygen technique. The device shows large Fabry-Perot oscillations. Resonant peaks and antiresonant troughs are observed as a function of the wavelength, with a peak responsivity of about 50 mA/W at 650 and 709 nm. The leakage current density is 85 pA/mm(2) at -5 V, and the average zero-bias capacitance is 12 pF/mm(2). We also demonstrate that the buried oxide prevents carriers generated deep within the substrate from reaching the top contacts, thus removing any slow carrier diffusion tail from the impulse response. (C) 1999 American Institute of Physics. (DOI: 10.1063/1.123499).
http://hdl.handle.net/10468/4410
Marcáilte
Marcáil
Transition Probabilities in Kr II and Kr III Spectra
(2003)
Djenize, Stevan; Milosavljevic, Vladimir; Dimitrijevic, Milan S
Transition Probabilities in Kr II and Kr III Spectra
(2003)
Djenize, Stevan; Milosavljevic, Vladimir; Dimitrijevic, Milan S
Achomaireacht:
<p>On the basis of the relative line intensity ratio (RLIR) method, transition probability values of the spontaneous emission (Einstein's <em>A</em> values) of 14 transitions in the singly (Kr II) and 7 transitions in doubly (Kr III) ionized krypton spectra have been obtained relatively to the reference <em>A</em> values related to the 435.548 nm Kr II and 324.569 nm Kr III, the most intensive transitions in the Kr II and Kr III spectra. Our Kr III transition probability values are the first data obtained experimentally using the RLIR method. A linear, low–pressure, pulsed arc operated in krypton discharge was used as an optically thin plasma source at a 17 000 K electron temperature and m<sup>-3</sup> electron density. Our experimental relative <em>A</em> values are compared with previous experimental and theoretical data.</p>
http://arrow.dit.ie/schfsehart/179
Marcáilte
Marcáil
Raman Scattering Analysis of Silicon Dioxide Single Crystal Treated by Direct Current Plasma Discharge
(2011)
Poparic, Dusan M; Milosavljevic, Vladimir; Zekic, Andrijana; Romcevic, N; Daniels, Steven
Raman Scattering Analysis of Silicon Dioxide Single Crystal Treated by Direct Current Plasma Discharge
(2011)
Poparic, Dusan M; Milosavljevic, Vladimir; Zekic, Andrijana; Romcevic, N; Daniels, Steven
Achomaireacht:
<p>Low-k materials such as silicon dioxide (SiO2) play an important role in the semiconductor industry. Plasma has become indispensable for advanced materials processing. In this work a treatment of SiO2single crystal by direct current plasma discharge is studied in detail. Offline metrology is conducted for silicon dioxide wafers by Raman scattering, energy-dispersive x-ray spectroscopy, and ellipsometry. Broad Raman peak at around 2800 cm−1 is observed for the treatedSiO2 wafers. Effects of plasma treatment on position of this peak are reported in the paper. An analysis of this correlation could be a framework for creating virtual etch rate sensors, which might be of importance in managing plasma etching processes.</p>
http://arrow.dit.ie/schfsehart/180
Marcáilte
Marcáil
The He I 706.52 nm line shape characteristics in the plasma diagnostics
(2003)
Milosavljevic, Vladimir; Djenize, Stevan
The He I 706.52 nm line shape characteristics in the plasma diagnostics
(2003)
Milosavljevic, Vladimir; Djenize, Stevan
Achomaireacht:
<p>On the basis of the precisely recorded 706.52 nm He I line shape we have obtained the basic plasma parameters <em>i.e.</em> electron temperature (<em>T</em>) and electron density (<em>N</em>) using our new line deconvolution procedure in the case of five various plasmas created in a linear, low–pressure, pulsed arc discharge. Plasma parameters have been also measured using independent experimental diagnostical techniques. Excellent agreement was found among the two sets of the obtained parameters. This enables our deconvolution procedure to recommendation for plasma diagnostical purposes, especially in astrophysics where direct measurements of the plasma parameters (<em>T</em> and <em>N</em>) are not possible. Besides, on the basis of the observed asymmetry of the Stark broadened line profile we have obtained its ion broadening parameter (<em>A</em>) caused by influence of the ion microfield to the line...
http://arrow.dit.ie/schfsehart/175
Marcáilte
Marcáil
Practical Sensor for Measurement of Nitrogen
(2007)
Popovic, Dusan; Milosavljevic, Vladimir; Daniels, Steven
Practical Sensor for Measurement of Nitrogen
(2007)
Popovic, Dusan; Milosavljevic, Vladimir; Daniels, Steven
Achomaireacht:
<p>This paper presents a method for precise measurement of atomic and molecular nitrogen in an oxygen-nitrogen dc plasma. This is achieved by monitoring the intensities of the atomic nitrogen spectral line at 821.6 nm and the molecular nitrogen bandhead at 337.1 nm, relative to the atomic oxygen spectral line at 844.7 nm. Oxygen is one of the most frequently used gases for surface chemical treatment, including deposition and etching, therefore the ability to measure and control the process and chemical composition of the process is essential. To validate this oxygen actimometry method for N2-xO2 (where x varies from 0 to 1) dc plasmas, threshold tests have been performed with Ar actinometry. The optical measurements have been performed using two methods. The first approach uses a USB2000 fiber optic spectrometer, calibrated with a Gigahertz–Optik BN-0102-1 reference standard source, to record the desired spectral lines. The second approach uses narrow bandwidth optical filters...
http://arrow.dit.ie/schfsehart/190
Marcáilte
Marcáil
Kieran Taaffe, Former Head of the Physics Department and Former Vice Principal, Kevin Street
(2010)
Taaffe, Kieran
Kieran Taaffe, Former Head of the Physics Department and Former Vice Principal, Kevin Street
(2010)
Taaffe, Kieran
Achomaireacht:
<p> Kieran Taaffe is a native of Co. Louth. He discusses his education with the Christian Brothers in Dundalk, and later at UCG from where he graduated with a degree in physics. He remained at the college where he worked as a junior lecturer while studying for his Master’s degree. He then emigrated to Sweden to work with Volvo and returned to Kevin Street as Assistant Head of Physics in 1968. He was later appointed as Head of Physics and remained in this post until 1982. He was also Chairman of the Academic Council for 1979-1981. In the recording Kieran Taaffe discusses the day and night classes in the Physics Department, dealing with the IDA and Enterprise Ireland in attempting to get employment for students. His involvement with Trinity began in 1970, when the National Council for Academic Awards was established. He recalls the challenging times experienced over the decades as funding was extremely limited, and the less than happy period in DIT from 1994-2000. He discusses h...
http://arrow.dit.ie/ditaud/24
Marcáilte
Marcáil
Laser produced plasmas as a source of ions, protons and X-rays
(2014)
Stefanuik, Robert
Laser produced plasmas as a source of ions, protons and X-rays
(2014)
Stefanuik, Robert
Achomaireacht:
The work presented in this thesis is primarily focused on the use of a laserproduced plasma as a source of protons, ions and X-rays. It explores highimpact applications of both high power ultrafast lasers and nanosecond lasers.Section 1 gives a general introduction to the physics governing the experimentsand the lasers in the following sections. The physics of plasmas isdescribed in Section 1.1. The physics of ultrafast lasers is described in detailin Section 1.2 from the theory of mode locking of oscillators to the compressionof high power ultrafast systems. The physics and mechanisms of X-raylasers are then explained in Section 1.3. Both the collisional excitation mechanismand the Linford gain equation are described along with a summery ofthe challenges in pumping X-ray lasers. Next in Section 1.4 laser acceleratedprotons are described in detail. Acceleration mechanisms are described andthe interaction mechanism with insulators is introduced. Finally, a numberof tools for photoabs...
http://hdl.handle.net/10197/6849
Marcáilte
Marcáil
Assessment of the Accuracy of an Ultrasound Elastography Liver Scanning System using a PVA-Cryogel Phantom with Optimal Acoustic and Mechanical Properties
(2010)
Cournane, S.; Cannon, L.; Browne, Jacinta; Fagan, A.
Assessment of the Accuracy of an Ultrasound Elastography Liver Scanning System using a PVA-Cryogel Phantom with Optimal Acoustic and Mechanical Properties
(2010)
Cournane, S.; Cannon, L.; Browne, Jacinta; Fagan, A.
Achomaireacht:
<p>The accuracy of a transient elastography liver-scanning ultrasound system was assessed using a novel application of PVA-cryogel as a tissue-mimicking material with acoustic and shear elasticity properties optimized to best represent those of liver tissue. Although the liver scanning system has been shown to offer a safer alternative for diagnosing liver cirrhosis through stiffness measurement, as compared to the liver needle biopsy exam, the scanner’s accuracy has not been fully established. The Young’s elastic modulus values of 5-6wt% PVA cryogel phantoms, also containing glycerol and 0.3μm Al2O3 and 3μm Al2O3, were measured using a ‘gold standard’ mechanical testing technique and transient elastography. The mechanically measured values and acoustic velocities of the phantoms ranged between 1.6 16.1kPa and 1540 1570m/s, respectively, mimicking those observed in liver tissue. The values reported by the transient elastography system overestimated the Young’s elastic modulus ...
http://arrow.dit.ie/meduart/5
Marcáilte
Marcáil
Optical Properties of Charged Polymer with Nano-sized Zeolite Inclusions
(2009)
Yovcheva, Temenujka; Naydenova, Izabela; Vlaeva, Ivanka; Todorov, Rosen; Toal, Vincent;...
Optical Properties of Charged Polymer with Nano-sized Zeolite Inclusions
(2009)
Yovcheva, Temenujka; Naydenova, Izabela; Vlaeva, Ivanka; Todorov, Rosen; Toal, Vincent; Sainov, Simeon
Achomaireacht:
<p>The optical characteristics of photopolymer films doped with nanoparticles are studied. The investigated systems consist of a soft polymer matrix containing porous zeolite nanoparticles with concentrations varied in the range from 0wt.% to 7wt.%. 40μm thick layers are obtained by casting the photopolymer nanocomposite solution on glass substrates. The corona charging influence on the transmission spectra and on the surface and the effective refractive index of the dry layers is investigated.</p>
http://arrow.dit.ie/cieocon2/20
Marcáilte
Marcáil
Solar disinfection of drinking water in the developing world, photoluminescence analysis of point defects in crystalline silicon and acoustic analysis of the human voice: A physicist’s journey in foreign lands.
(2013)
McGuigan, Kevin Gerard
Solar disinfection of drinking water in the developing world, photoluminescence analysis of point defects in crystalline silicon and acoustic analysis of the human voice: A physicist’s journey in foreign lands.
(2013)
McGuigan, Kevin Gerard
Achomaireacht:
The following publications are a chronological account of my research career spanning the past three decades. The body of work is divided into three broad categories corresponding to: (i) Solid State Physics, (ii) Point-of-Use Water Treatment and (iii) Other Fields of Research. Each category has brought its own rewards
http://doras.dcu.ie/19613/
Marcáilte
Marcáil
Examining the Relationship Between Physics Students’ Spatial Skills and Conceptual Understanding of Newtonian Mechanics
(2015)
Mac Raighne, Aaron; Behan, Avril; Duffy, Gavin; Farrell, Stephanie; Harding, Rachel; Ho...
Examining the Relationship Between Physics Students’ Spatial Skills and Conceptual Understanding of Newtonian Mechanics
(2015)
Mac Raighne, Aaron; Behan, Avril; Duffy, Gavin; Farrell, Stephanie; Harding, Rachel; Howard, Robert; Nevin, Edmund; Bowe, Brian
Achomaireacht:
<p>One of the primary motivating factors of physics educators is to ensure a high level of conceptual understanding is achieved by their students. Furthermore it has been shown that success in physics and engineering courses is strongly related to students' spatial skills. Conceptual and spatial skills tests have been independently developed and reported in the literature as a measure of each of these competencies. In this study we examine correlations between spatial skills and conceptual understanding using two of these tests in order to determine the relationship, if any, between students' conceptual understanding of Newtonian mechanics and their spatial skills. Spatial skills and Conceptual understanding of physics are tested using the Purdue Spatial Visualisation Test of Rotations (PSVT:R) and the Force Motion Concept Evaluation (FMCE) respectively. Correlations between PSVT:R and FCME scores are presented along with significant gender biases in both test scores...
http://arrow.dit.ie/scschphycon/18
Marcáilte
Marcáil
Towards data-driven magnetic materials discovery
(2017)
ZIC, MARIO
Towards data-driven magnetic materials discovery
(2017)
ZIC, MARIO
Achomaireacht:
Magnetic materials underpin many of the technologies that define the world we live in. Despite the tremendous technological progress, the discovery of new magnetic materials has been rather slow. In this Thesis we explore and develop new, data-oriented, methods for the accelerated discovery and development of new magnetic materials. We utilize available theoretical databases of Heusler alloy properties to: develop a high-throughput (HT) screening procedure for the discovery of new permanent magnets, identify the defects in Mn-Ru-Ga thin films, and build machine learning (ML) models for predicting the structural and the magnetic properties of Heusler alloys. We identify a dozen materials, which meet all of the criteria for permanent magnet applications. The analysis of the HT data allowed us to understand the ideal composition of hard magnetic materials in the family of regular Heusler alloys, and to show how structure-property constraints affect the abundance of the potential candid...
http://hdl.handle.net/2262/80562
Marcáilte
Marcáil
Double-Glazing Interferometry
(2009)
Toal, Vincent; Mihaylova, Emilia
Double-Glazing Interferometry
(2009)
Toal, Vincent; Mihaylova, Emilia
Achomaireacht:
<p>This note describes how white light interference fringes can be seen by observing the Moon through a double-glazed window. White light interferometric fringes are normally observed only in a well-aligned interferometer whose optical path difference is less than the coherence length of the light source, which is approximately one micrometer for white light. Obtaining such fringes in a Michelson interferometer is not a trivial task.1 The interferometer is typically illuminated with a monochromatic source and the path length difference adjusted with a wedge angle between the interferometer mirrors so that five or six vertical fringes are visible, indicating nearly equal paths. Then the mirrors are adjusted until the fringes are almost perfectly straight. Finally we use a white light source and carefully scan through the approximately equal path range until five or six white light fringes are seen to sweep rapidly by.</p>
http://arrow.dit.ie/scschphyart/2
Marcáilte
Marcáil
Apparent stress-strain relationships in experimental equipment where magnetorheological fluids operate under compression mode
(2008)
Mazlan, S.A.; Ekreem, Nasser B.; Olabi, Abdul-Ghani
Apparent stress-strain relationships in experimental equipment where magnetorheological fluids operate under compression mode
(2008)
Mazlan, S.A.; Ekreem, Nasser B.; Olabi, Abdul-Ghani
Achomaireacht:
Abstract: This paper presents an experimental investigation of two different magnetorheological ( MR) fluids, namely, water-based and hydrocarbon-based MR fluids in compression mode under various applied currents. Finite element method magnetics was used to predict the magnetic field distribution inside the MR fluids generated by a coil. A test rig was constructed where the MR fluid was sandwiched between two flat surfaces. During the compression, the upper surface was moved towards the lower surface in a vertical direction. Stress-strain relationships were obtained for arrangements of equipment where each type of fluid was involved, using compression test equipment. The apparent compressive stress was found to be increased with the increase in magnetic field strength. In addition, the apparent compressive stress of the water-based MR fluid showed a response to the compressive strain of greater magnitude. However, during the compression process, the hydrocarbon-based MR fluid appear...
http://doras.dcu.ie/16052/
Marcáilte
Marcáil
Gender disparity in engineering as a function of physics enrollment and its implications for civil engineering
(2009)
Laefer, Debra F.
Gender disparity in engineering as a function of physics enrollment and its implications for civil engineering
(2009)
Laefer, Debra F.
Achomaireacht:
Despite tremendous advances by women in the natural and applied sciences, where in selective fields women have surpassed men in the earning of doctoral degrees for more nearly 20 years, female enrollment levels in engineering continue to be a fraction of male enrollment. Gender disparities of more than 60% persist in undergraduate engineering enrollments and have recently worsened. As American female Civil Engineering enrollment has been flat for over 25 years, efforts must be taken to understand this stasis. This paper focuses primarily on secondary education preparation in terms of both attitudes towards and enrollment levels in pre-engineering courses such as calculus, chemistry, and physics. Additional consideration is given to enrollment and achievement in advanced placement courses, as reflected in national examination rates. This paper concludes that secondary school participation and achievement in physics courses is a critical differential factor as one explanatory ele...
http://hdl.handle.net/10197/2286
Marcáilte
Marcáil
Stiefel and Grassmann Manifolds in Quantum Chemistry
(2012)
Chiumiento, Eduardo; Melgaard, Michael
Stiefel and Grassmann Manifolds in Quantum Chemistry
(2012)
Chiumiento, Eduardo; Melgaard, Michael
Achomaireacht:
<p>We establish geometric properties of Stiefel and Grassmann manifolds which arise in relation to Slatertype variational spaces in many-particle Hartree-Fock theory and beyond. In particular, we prove thatthey are analytic homogeneous spaces and submanifolds of the space of bounded operators on the single-particle Hilbert space. As a by-product we obtain that they are complete Finsler manifolds. These geometric properties underpin state-of-the-art results on existence of solutions to Hartree-Fock type equations.</p>
http://arrow.dit.ie/scschmatart/122
Marcáilte
Marcáil
Negative ion measurements in RF and DC temporally modulated hydrogen volume ion sources
(2000)
Boilson, Deirdre
Negative ion measurements in RF and DC temporally modulated hydrogen volume ion sources
(2000)
Boilson, Deirdre
Achomaireacht:
Negative ion research is stimulated by the need for high power and high density neutral beams for neutral beam heating systems to be used in proposed nuclear fusion reactors. Extensive research has been carried out on the enhancement of the production of negative ions from hydrogen/deuterium discharges. The negative ion sources used at present are being investigated in order to optimise current densities of H7D' for future fusion machines. In this thesis low pressure radio frequency (RF) hydrogen plasmas are investigated and compared to filament driven hydrogen plasmas to understand further the physics in the two different modes, and to investigate the proposal of the utilisation of an RF volume ion source in he application of neutral beam injection (NBI) systems for the proposed nuclear fusion reactors of the future. Tuned Langmuir probes are used as a diagnostic method to measure different plasma parameters as a function of pressure and power. The spatial variations of thes...
http://doras.dcu.ie/18345/
Marcáilte
Marcáil
Automation by PC interface of a multicusp volume ion source, Denise
(1997)
Boilson, Deirdre
Automation by PC interface of a multicusp volume ion source, Denise
(1997)
Boilson, Deirdre
Achomaireacht:
DENISE is an acronym for Deuterium Negative Ion Source Experiment and originated in FOM the Institute for Atomic and Molecular Physics in DCU where it is being recommissioned as a test bed for the production and extraction of negative hydrogen ion for use in proposed nuclear fusion reactors. These reactors require the neutralisation of particle beams of up to hundreds of amps and energies of about IMeV for use in Neutral Beam Injection (N.B.I.). The objective of this project was to automate the multicusp volume ion source called DENISE. Automation is the technology concerned with the application of mechanical, electronic, and computer-based systems in the operation and control of production. This process of technological development lends real-time monitoring and quick error detection and correction to parameters and components that need to be controlled. Another feature is the ease of use and the attraction of the safety features that are inherent in this technology. The paramet...
http://doras.dcu.ie/18344/
Marcáilte
Marcáil
Effects of the crystallite mosaic spread on integrated peak intensities in 2θ-ω measurements of highly crystallographically textured ZnO thin films
(2011)
McCarthy, Eanna; Rajendra Kumar, Ramasamy Thangavelu; Doggett, B.; Chakrabarti, S.; O...
Effects of the crystallite mosaic spread on integrated peak intensities in 2θ-ω measurements of highly crystallographically textured ZnO thin films
(2011)
McCarthy, Eanna; Rajendra Kumar, Ramasamy Thangavelu; Doggett, B.; Chakrabarti, S.; O'Haire, Richard J. ; Newcomb, Simon B.; Mosnier, Jean-Paul; Henry, Martin O.; McGlynn, Enda
Achomaireacht:
We report x-ray diffraction (2θ-ω and rocking curve) and transmission electron microscopy measurements on crystallographically textured ZnO thin films of varying thicknesses and crystallite mosaic spread deposited by pulsed laser deposition on Si. The integrated areas of the (0002) ZnO reflections in 2θ-ω mode do not scale with film thickness and in some cases show discrepancies of two orders of magnitude compared to expectations based solely on sample thicknesses. Intensity differences of this type are regularly used in the literature as indications of differences in sample crystallinity or crystal quality. However transmission electron microscopy data of our samples show no evidence of amorphous deposits or significantly varying crystal quality in different films. X-ray rocking curves of these samples do show substantial variations in the mosaic spread of crystallites in the ZnO films which are the origin of the differences in integrated areas of the (0002) ZnO reflections in 2θ-ω...
http://doras.dcu.ie/19660/
Marcáilte
Marcáil
Comparative Imaging Study in Ultrasound, MRI, CT and DSA Using a Multi-Modality Renal Artery Phantom
(2011)
King, Deirdre; Fagan, Andrew; Moran, Carmel; Browne, Jacinta
Comparative Imaging Study in Ultrasound, MRI, CT and DSA Using a Multi-Modality Renal Artery Phantom
(2011)
King, Deirdre; Fagan, Andrew; Moran, Carmel; Browne, Jacinta
Achomaireacht:
<p>A range of anatomically realistic multimodality renal artery phantoms consisting of vessels with varying degrees of stenosis was developed and evaluated using four imaging techniques currently used to detect renal artery stenosis (RAS). The spatial resolution required to visualize vascular geometry and the velocity detection performance required to adequately characterize blood flow in patients suffering from RAS are currently ill-defined, with the result that no one imaging modality has emerged as a gold standard technique for screening for this disease.</p> <p><strong>Methods:</strong></p> <p>The phantoms, which contained a range of stenosis values (0%, 30%, 50%, 70%, and 85%), were designed for use with ultrasound,magnetic resonance imaging,x-raycomputed tomography, and x-raydigital subtraction angiography. The construction materials used were optimized with respect to their ultrasonic speed of sound and attenuation coefficient, MR rel...
http://arrow.dit.ie/scschphyart/46
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The Effects of Fatty Desposits on the Accuracy of the Fibroscan Liver Transient Elastography Ultrasound System
(2012)
Cournane, S.; Browne, Jacinta; Fagan, Andrew
The Effects of Fatty Desposits on the Accuracy of the Fibroscan Liver Transient Elastography Ultrasound System
(2012)
Cournane, S.; Browne, Jacinta; Fagan, Andrew
Achomaireacht:
<p>A new generation of ultrasound transient elastography (TE) systems have emerged which exploit the well-known correlation between the liver’s pathological and mechanical properties through measurements of the Young’s elastic modulus; however, little work has been carried out to examine the effect that fatty deposits may have on the TE measurement accuracy. An investigation was carried out on the effects on the measurement accuracy of a transient elastography ultrasound system, the Fibroscan®, caused by overlaying fat layers of varying thickness on healthy liver-mimicking phantoms, simulating in vivo conditions for obese patients. Furthermore, a steatosis effect similar to that in non-alcoholic fatty liver disease (NAFLD) and alcoholic liver disease (ALD) was simulated to investigate its effect on the TE system. A range of novel elastography fat-mimicking materials were developed using 6-10wt% poly(vinyl alcohol) cryogel capable of achieving a range of acoustic velocities (14...
http://arrow.dit.ie/scschphyart/52
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A dipole polarizable potential for reduced and doped CeO(2) obtained from first principles.
(2011)
WATSON, GRAEME
A dipole polarizable potential for reduced and doped CeO(2) obtained from first principles.
(2011)
WATSON, GRAEME
Achomaireacht:
In this paper we present the parameterization of a new interionic potential for stoichiometric, reduced and doped CeO2. We use a dipole polarizable potential (DIPPIM: the dipole polarizable ion model) and optimize its parameters by fitting them to a series of density functional theory calculations. The resulting potential was tested by calculating a series of fundamental properties for CeO2 and by comparing them against experimental values. The values for all the calculated properties (thermal and chemical expansion coefficients, lattice parameters, oxygen migration energies, local crystalline structure and elastic constants) are within 10?15% of the experimental ones, an accuracy comparable to that of ab initio calculations. This result suggests the use of this new potential for reliably predicting atomic scale properties of CeO2 in problems where ab initio calculations are not feasible due to their size limitations.
http://hdl.handle.net/2262/56909
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Anomalous electrical transport properties of polyvinyl alcohol-multiwall carbon nanotubes composites below room temperature
(2011)
BLAU, WERNER
Anomalous electrical transport properties of polyvinyl alcohol-multiwall carbon nanotubes composites below room temperature
(2011)
BLAU, WERNER
Achomaireacht:
Anomalous electrical transport properties of polyvinyl alcohol-multiwall carbon nanotubes composites below room temperature G. Chakraborty, 1 K. Gupta, 1 A. K. Meikap, 1, a R. Babu, 2 and W. J. Blau 2 1 Department of Physics, National Institute of Technology, Durgapur Mahatma Gandhi Avenue, Durgapur, 713209 West Bengal, India 2 Department of Physics, University of Dublin Trinity College, Dublin 2, Ireland Received 29 September 2010; accepted 9 December 2010; published online 3 February 2011 The dc and ac electrical transport property of polyvinyl alcohol-multiwall carbon nanotubes composites has been investigated within a temperature range 77 T 300 K and in the frequency range 20 Hz?1 MHz in presence as well as in absence of a transverse magnetic field up to 1 T. The dc conductivity follows variable range hopping model. The magnetoconductivity of the samples changes a sign from positive to negative with an increase in temperature which can be interpreted by the dominancy of the quan...
http://hdl.handle.net/2262/66790
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Three-state dual spin valve structure
(2010)
COEY, JOHN; FOWLEY, CIARAN
Three-state dual spin valve structure
(2010)
COEY, JOHN; FOWLEY, CIARAN
Achomaireacht:
A dual spin valve is built with exchange bias on the top and bottom pinned layers and a central free layer. By suitable choice of the antiferromagnetic and ferromagnetic layer thicknesses, it is possible to separate the three magnetization switching fields and produce a staircase magnetoresistive curve. The maximum magnetoresistance (MR) ratio is 7.6% for current-perpendicular-to-plane and 6.3% for current-in-plane geometries with intermediate MRs of 3.9% and 3.0%, respectively. The use of exchange bias in a multistate memory device is discussed.
http://hdl.handle.net/2262/61580
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Marcáil
Simplified TBA equations of the AdS_5 x S^5 mirror model
(2009)
FROLOV, SERGEY
Simplified TBA equations of the AdS_5 x S^5 mirror model
(2009)
FROLOV, SERGEY
Achomaireacht:
We use the recently found integral representation for the dressing phase in the kinematic region of the mirror theory to simplify the TBA equations for the AdS5 ? S5 mirror model. The resulting set of equations provides an efficient starting point for both analytic and numerical studies.
http://hdl.handle.net/2262/38865
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