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Displaying Results 6851 - 6866 of 6866 on page 275 of 275
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XUV and VUV photoabsorption and emission studies in thorium and other high-z laser plasmas
(2000)
Meighan, Oonagh
XUV and VUV photoabsorption and emission studies in thorium and other high-z laser plasmas
(2000)
Meighan, Oonagh
Abstract:
Fundamental investigations into the atomic structure of actinide atoms and ions provide a wealth of information on the physical and chemical behaviour of these elements. In this work, thorium, the second actinide element is investigated. Inner shell photoabsorption features in the 6p and 5d spectra of the free thorium atom and thorium ions produced in a laser plasma plume have been recorded using the space and time resolved Dual Laser Plasma (DLP) spectroscopic technique. Studies focus, in particular, on the investigation of the 6p —» 6d and the 5d —> 5, si' giant dipole resonance features residing in the VUV (15 to 40eV) and XUV (80 to 150eV) inner shell photoabsorption spectra of atomic and ionic thorium. The evolution of both giant dipole resonance profiles with increasing ionisation along the thorium isonuclear sequence Th to Th6+ has been studied. Results indicate that the 6d wavefunction is collapsed in neutral thorium, whereas the 5f wavefunction is to a large extent...
http://doras.dcu.ie/19071/
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XUV photoabsorption studies along extended isoelectronic sequences using a dual laser produced plasma techniques
(1990)
Brilly, James
XUV photoabsorption studies along extended isoelectronic sequences using a dual laser produced plasma techniques
(1990)
Brilly, James
Abstract:
Hot dense plasmas produced when the output of powerful pulsed laser systems are focused onto targets located in vacuum have been the subject of extensive study for a number of years. Such plasmas have found applications both as intense sources of continuum radiation in the XUV and as a versatile source of ionic species. In the work reported here the above properties of the laser produced plasma were exploited and enabled many new photoabsorption spectra of ionic species to be recorded in the XUV region. Using a dual laser produced plasma technique the XUV radiation emitted from laser plasmas created on the surface of a high Z material was used to backlight a second laser plasma and carry out ionic photoabsorption studies at wavelengths below 300A. An extensive examination of a number of isoelectronic sequences was undertaken. XUV photoabsorption studies were carried out on members of the neon, sodium, argon, krypton, bromine, selenium and xenon sequences. Absorption along the neon...
http://doras.dcu.ie/19162/
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XUV photoabsorption studies of calcium and the neon isoelectronic sequence
(1999)
Gray, Andrew
XUV photoabsorption studies of calcium and the neon isoelectronic sequence
(1999)
Gray, Andrew
Abstract:
Using the dual laser plasma photoabsorption technique, the 3p region of Ca°, Ca+ and Ca2+ and the 2s and 2p regions of Ne°, Na+, Mg2+, Al3+ and Si4+, have been investigated. High quality spectra have been obtained by paying careful attention to instrumental effects and plasma opacity. For Ca+, the DLP data has been correlated with previously measured photoion results to obtain improved absolute cross sections. By using spatiotemporal maps, excellent ion stage separation for members of the calcium isonuclear sequence has been achieved. Comparison of the DLP data with independent Hartree- Fock calculations and data from other experimental and theoretical studies has revealed, for the first time, 4 features arising from the Ca°3p64s3d excited state and 18 features arising from the Ca+3p63d excited state. New lines of Ca+ 3p64s ground state origin have also been resolved. In the first systematic experimental study of the neon isoelectronic sequence, higher members of the 2s22p6 —> 2...
http://doras.dcu.ie/18787/
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Yeast: a potential biomass substrate for the production of cleaner energy (Biogas)
(2014)
Ekpeni, Leonard E.N.; Nkem-Ekpeni, Fehintola F.; Benyounis, Khaled; Aboderheeba, Ayad K...
Yeast: a potential biomass substrate for the production of cleaner energy (Biogas)
(2014)
Ekpeni, Leonard E.N.; Nkem-Ekpeni, Fehintola F.; Benyounis, Khaled; Aboderheeba, Ayad Khalifa Mohamed; Stokes, Joseph; Olabi, Abdul-Ghani
Abstract:
Yeast cell wall and its entire contents disruption treatments are required in the enhancement of protein and the overall biodegradability of the cell wall materials during homogenization process. Yeast as a cheap, good resource and easily available source of energy from biomass into biogas, it was used as a substrate for the cleaner energy production due to its richly and high level content of protein contained in it. An initial study on the effects of high-pressure homogenizer mechanical pretreatment has been conducted in sequence as generated by the design matrix of the design of experiment (DOE) focusing on protein yields from bakers’ yeast also known as Saccharomyces cerevisiae and in order to achieve the maximum yield of protein which in other words aid biogas production, the following optimum process parameters were set in. The yeast block was refrigerated at between 0 – 4 °C with fermentation at (0 – 24 h), a pH value of (5.3) maximum was used in the preparation of the buffe...
http://doras.dcu.ie/20455/
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Yes, minister: The impact of decision-making rules on geographically targeted particularistic spending
(2012)
Suiter, Jane; O'Malley, Eoin
Yes, minister: The impact of decision-making rules on geographically targeted particularistic spending
(2012)
Suiter, Jane; O'Malley, Eoin
Abstract:
This paper tests a number of hypotheses which have been used to explain particularistic political spending. Using constituency level data we can better evaluate the competing merits of theories predicting whether parties reward their voters or target floating or swing voters to maximise the party’s electoral return. We also test the hypothesis that the spending decision-making rule is most important and may determine which of the loyal or marginal voters are targeted, or indeed whether another group might be rewarded. We find that the decision rule is indeed most important, and the unusual level of discretion to ministers in Ireland will determine where these monies go. This finding adds greatly to our theoretical knowledge of geographically targeted spending and is consistent with empirical findings in other countries.
http://doras.dcu.ie/16842/
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You and me and the in-between: what sales professionals know about their client relationships: a grounded analysis
(2001)
Geiger, Susi
You and me and the in-between: what sales professionals know about their client relationships: a grounded analysis
(2001)
Geiger, Susi
Abstract:
This PhD dissertation draws from philosophical and psychological arguments as well as from current discussions in knowledge management to put forward a conception of sales people’s customer knowledge as tacit, situational, pragmatic and action-related. Depth-interviews and observational methods are used to examine the nature of sales people’s customer knowledge; data are analysed following the grounded theory method. The empirical investigation establishes that a sales person’s knowledge of the client cannot be dissected from the relationship in which it is created and put to use. The sales person knows her customers in and through the relationship she builds and maintains with them; customer knowledge is first and foremost relational knowledge. Such relational knowledge is social in nature and it is almost exclusively experiential knowledge: it is built up, developed and changed during the interaction with the client. This view of customer knowledge sheds a new light on such issues...
http://doras.dcu.ie/18745/
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Young children as global citizens
(2010)
Dillon, Sheila; Ruane, Brian; Kavanagh, Anne-Marie
Young children as global citizens
(2010)
Dillon, Sheila; Ruane, Brian; Kavanagh, Anne-Marie
Abstract:
The publication of Aistear, the Early Childhood Curriculum Framework (NCCA, 2009) provides a unique opportunity to promote the inclusion of a global and justice perspective in education programmes for young children at pre-school and junior primary school levels. The Framework highlights the importance of global citizenship and diversity issues and provides the opportunity to support educators engaged in their implementation. To facilitate the provision of such support, a partnership between Trócaire and St Patrick’s College, Drumcondra has undertaken research into young children’s engagement with issues of global justice. This article describes the background to the research, the methodologies used, and the research findings and dissemination.
http://doras.dcu.ie/21589/
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Young Ireland and The Nation: nationalist children’s culture in the late nineteenth century
(2011)
Nic Congáil, Ríona
Young Ireland and The Nation: nationalist children’s culture in the late nineteenth century
(2011)
Nic Congáil, Ríona
http://doras.dcu.ie/21564/
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Young people's perspectives on genetics, identity and society using film and discussion
(2005)
Murphy, Padraig
Young people's perspectives on genetics, identity and society using film and discussion
(2005)
Murphy, Padraig
Abstract:
Since Darwin, knowledge about biology has, for many, had a diminishing effect on ideas of identity and humanity's place in the world. In recent years biotechnology has raised further public concerns about 'playing God' and 'interfering with life.' School biology curricula however rarely open up the socio-scientific debate to allow students to explore such philosophical issues. This study aimed to identify connections biology students make between current accepted genetic knowledge, biotechnology and philosophical issues of society and identity. One major element of popular culture - film - was used in classrooms to engage students to explore the interfaces of biological knowledge, technology, society and identity. Ninety-seven students across eight schools watched a film about genetic disease exploring pre- implantation genetic diagnosis(PGD), eugenics, individual identity and science in society. Structured classroom debates and discussion were recorded and ...
http://doras.dcu.ie/14814/
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Young, gifted and underachieving: Examining the role of mentoring in assisting underachieving highly-able students achieve their educational potential.
(2012)
Laurenson, Pauline
Young, gifted and underachieving: Examining the role of mentoring in assisting underachieving highly-able students achieve their educational potential.
(2012)
Laurenson, Pauline
Abstract:
The education of gifted and talented pupils is a topical issue and one of growing concern to many parents and teachers. This was of particular concern in the school in which I was a teacher. The school determined students as being of high ability when they scored in the top ten percent of the school population as indicated by standardised tests they completed prior to and upon admission. These tests were the Cognitive Abilities Test 3 and the Drumcondra Reasonsing Test. Teachers were also encouraged to identify students who they perceived to be highly able in their subject area. The aim of this study was to examine reasons why pupils of high ability might underachieve and to address these issues through the use of a mentoring project. The mentors used positive psychology and metacognition strategies in an effort to get the students to achieve their potential. Another aim of the study was to consider how a project of this nature might be managed in a large secondary school wit...
http://doras.dcu.ie/16769/
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Zeolite-Y scaffolded donor-acceptor systems for nanoelectronics
(2014)
Sewell , Gavin
Zeolite-Y scaffolded donor-acceptor systems for nanoelectronics
(2014)
Sewell , Gavin
Abstract:
Zeolites can act as hosts for supramolecular organization of molecules and complexes. A key objective in supramolecular chemistry is the development of donor acceptor systems capable of controlled photoinduced electron and energy transfer. This thesis focuses on a fundamental study of the capacity of zeolite materials to accommodate dipolar communication between metal complex guest species as well as exploring the effect of zeolite materials on the photophysical properties of guest molecules. Chapter 1 and 2 outline the current state of zeolite host-guest chemistry and the experimental procedures and instrumentation ultilised in this work. Chapter 3 investigates the ability of Y-zeolite to accommodate energy transfer processes between co-doped donors and acceptors. A series of [Ru(bpy)3]2+ (where bpy is 2,2’-bipyridine) doped Zeolite Y materials co-doped with iron polypyridyl complexes [Fe(bpy)3]2+ and [Fe(tpy)2]2+ were prepared via the ‘ship in a bottle’ syntesis. The co-encapsulat...
http://doras.dcu.ie/19759/
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ZhiWo: Activity tagging and recognizing system from personal lifelogs
(2013)
Zhou, Lijuan Marissa; Gurrin, Cathal; Qiu, Zhengwei
ZhiWo: Activity tagging and recognizing system from personal lifelogs
(2013)
Zhou, Lijuan Marissa; Gurrin, Cathal; Qiu, Zhengwei
Abstract:
With the increasing use of mobile devices as personal record- ing, communication and sensing tools, extracting the seman- tics of life activities through sensed data (photos, accelerom- eter, GPS etc.) is gaining widespread public awareness. A person who engages in long-term personal sensing is engag- ing in a process of lifelogging. Lifelogging typically involves using a range of (wearable) sensors to capture raw data, to segment into discrete activities, to annotate and subse- quently to make accessible by search or browsing tools. In this paper, we present an intuitive lifelog activity record- ing and management system called ZhiWo. By using a su- pervised machine learning approach, sensed data collected by mobile devices are automatically classified into different types of daily human activities and these activities are inter- preted as life activity retrieval units for personal archives.
http://doras.dcu.ie/17846/
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Zn doped nanocrystalline CuCl thin films for optoelctronic applications
(2010)
Vijayaraghavan, Rajani K.; Olabanji Lucas, Francis; Alam, Mohammad ; Daniels, Stephen; ...
Zn doped nanocrystalline CuCl thin films for optoelctronic applications
(2010)
Vijayaraghavan, Rajani K.; Olabanji Lucas, Francis; Alam, Mohammad ; Daniels, Stephen; McNally, Patrick J.
Abstract:
We report on the use of Zn as an n-type dopant in CuCl thin films for optoelectronic applications, wherein maximum n-type doping of the order of 1018 cm -3 has been achieved. Zn doped nanocrystalline CuCl thin films are successfully deposited on glass and Si substrates by pulsed dc magnetron sputtering. Structural and morphological properties are investigated using X-ray diffraction (XRD) studies and Scanning Electron Microscopy (SEM), respectively. The conductivity of the CuCl:Zn films is examined using the four point probe technique. An order of magnitude increase in the conductivity of CuCl, by the doping with Zn is reported herein. The doped CuCl films display strong room temperature cathodoluminescence (CL) at ~ 385nm, which is similar to that of the undoped films. Hall Effect measurements show an n-type conductivity of the doped films.
http://doras.dcu.ie/17856/
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ZnO nanorods for efficient third harmonic UV generation
(2014)
Das, Susanta Kumar; Güell, Frank; Gray, Ciarán; Das, Prasanta Kumar; Grunwald, Ruediger...
ZnO nanorods for efficient third harmonic UV generation
(2014)
Das, Susanta Kumar; Güell, Frank; Gray, Ciarán; Das, Prasanta Kumar; Grunwald, Ruediger; McGlynn, Enda
Abstract:
ZnO nanorods grown by both high temperature vapour phase transport and low temperature chemical bath deposition are very promising sources for UV third harmonic generation. Material grown by both methods show comparable efficiencies, in both cases an order of magnitude higher than surface third harmonic generation at the quartz-air interface of a bare quartz substrate. This result is in stark contrast to the linear optical properties of ZnO nanorods grown by these two methods, which show vastly different PL efficiencies. The third harmonic generated signal is analysed using intensity dependent measurements and interferometric frequency resolved optical gating, allowing extraction of the laser pulse parameters. The comparable levels of efficiency of ZnO grown by these very different methods as sources for third harmonic UV generation provides a broad suite of possible growth methods to suit various substrates, coverage and scalability requirements. Potential application areas range f...
http://doras.dcu.ie/19883/
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ZnO nanorods for efficient third harmonic UV generation: erratum
(2014)
Das, Susanta Kumar; Güell, Frank; Gray, Ciarán; Das, Prasanta Kumar; Grunwald, Ruediger...
ZnO nanorods for efficient third harmonic UV generation: erratum
(2014)
Das, Susanta Kumar; Güell, Frank; Gray, Ciarán; Das, Prasanta Kumar; Grunwald, Ruediger; McGlynn, Enda
Abstract:
We correct Eq. (1) of our previous paper showing the pulse duration (τ) dependence on group delay dispersion (β2) and initial duration of the unchirped pulse coming from the laser (τ0). The correct form of the equation was used in all the calculations in the previous paper however, so in all other respects our previous results and conclusions are unchanged.
http://doras.dcu.ie/19976/
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Zwitterionic ion chromatography of common inorganic anions using stationary phases modified with carboxybetaine-type surfactants
(2006)
O'Riordain, Colman
Zwitterionic ion chromatography of common inorganic anions using stationary phases modified with carboxybetaine-type surfactants
(2006)
O'Riordain, Colman
Abstract:
Carboxybetaine-type zwitterionic surfactants were employed to dynamically modify reversed-phase columns (both particle-packed and monolithic in structure), before investigating their use as stationary phases for the determination of common inorganic anions by zwitterionic ion chromatography (ZIC). Both surfactants utilised (namely dodecyldimethylaminoacetic acid and N-dodecyl-N,N- (dimethylammonio)undecanoate (DDMAU)) had a similar structure, with an internal, positively charged ammonium group, and an external, negatively charged carboxylate group, but DDMAU was found to exhibit superior column coating stability, due to its increased hydrophobic character. Both surfactants were found to have a pH dependent effective ion-exchange capacity, with increased eluent pH values resulting in reduced analyte anion retention times, due to increased protonation of the weak acid terminal group of the surfactant molecules. The suitability of these carboxybetaine-modified stationary phases to the ...
http://doras.dcu.ie/18144/
Displaying Results 6851 - 6866 of 6866 on page 275 of 275
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