Search

Your search keyword '"Barrett, Nick"' showing total 30 results
Start Over Author "Barrett, Nick" Search Limiters Full Text
30 results on '"Barrett, Nick"'

1. Raman signatures of ferroic domain walls captured by principal component analysis

Author

Nataf, Guillaume F., Barrett, Nick, Kreisel, Jens, and Guennou, Mael

Subjects
Condensed Matter - Materials Science
Abstract

Ferroic domain walls are currently investigated by several state-of-the art techniques in order to get a better understanding of their distinct, functional properties. Here, Principal Component Analysis (PCA) of Raman maps is used to study ferroelectric domain walls (DWs) in LiNbO3 and ferroelastic DWs in NdGaO3. It is shown that PCA allows to quickly and reliably identify small Raman peak variations at ferroelectric DWs and that the value of a peak shift can be deduced - accurately and without a-priori - from a first order Taylor expansion of the spectra. The ability of PCA to separate the contribution of ferroelastic domains and DWs to Raman spectra is emphasized. More generally, our results provide a novel route for the statistical analysis of any property mapped across a DW., Comment: 17 pages, 8 figures

Published
2018
Full Text
View/download PDF

2. Evolution of defect signatures at ferroelectric domain walls in Mg-doped LiNbO3

Author

Nataf, Guillaume F., Guennou, Mael, Haußmann, Alexander, Barrett, Nick, and Kreisel, Jens

Subjects
Condensed Matter - Materials Science
Abstract

The domain structure of uniaxial ferroelectric lithium niobate single crystals is investigated using Raman spectroscopy mapping. The influence of doping with magnesium and poling at room temperature is studied by analysing frequency shifts at domain walls and their variations with dopant concentration and annealing conditions. It is shown that defects are stabilized at domain walls and that changes in the defect structures with Mg concentration can be probed by the shift of Raman modes. We show that the signatures of polar defects in the bulk and at the domain walls differ., Comment: 10 pages, 3 figures

Published
2018
Full Text
View/download PDF

3. Roadmap on ferroelectric hafnia- and zirconia-based materials and devices

Author

Silva, José P. B., primary, Alcala, Ruben, additional, Avci, Uygar E., additional, Barrett, Nick, additional, Bégon-Lours, Laura, additional, Borg, Mattias, additional, Byun, Seungyong, additional, Chang, Sou-Chi, additional, Cheong, Sang-Wook, additional, Choe, Duk-Hyun, additional, Coignus, Jean, additional, Deshpande, Veeresh, additional, Dimoulas, Athanasios, additional, Dubourdieu, Catherine, additional, Fina, Ignasi, additional, Funakubo, Hiroshi, additional, Grenouillet, Laurent, additional, Gruverman, Alexei, additional, Heo, Jinseong, additional, Hoffmann, Michael, additional, Hsain, H. Alex, additional, Huang, Fei-Ting, additional, Hwang, Cheol Seong, additional, Íñiguez, Jorge, additional, Jones, Jacob L., additional, Karpov, Ilya V., additional, Kersch, Alfred, additional, Kwon, Taegyu, additional, Lancaster, Suzanne, additional, Lederer, Maximilian, additional, Lee, Younghwan, additional, Lomenzo, Patrick D., additional, Martin, Lane W., additional, Martin, Simon, additional, Migita, Shinji, additional, Mikolajick, Thomas, additional, Noheda, Beatriz, additional, Park, Min Hyuk, additional, Rabe, Karin M., additional, Salahuddin, Sayeef, additional, Sánchez, Florencio, additional, Seidel, Konrad, additional, Shimizu, Takao, additional, Shiraishi, Takahisa, additional, Slesazeck, Stefan, additional, Toriumi, Akira, additional, Uchida, Hiroshi, additional, Vilquin, Bertrand, additional, Xu, Xianghan, additional, Ye, Kun Hee, additional, and Schroeder, Uwe, additional

Published
2023
Full Text
View/download PDF

4. Evidence of Ba-rich surface segregation in Ba1-xSrxTiO3 and Ba-rich surfactant in SrTiO3/ Ba1-xSrxTiO3 stacks grown by combinatorial pulsed laser deposition

Author

Agudelo-Estrada Santiago, Barrett Nick, Lubin Christophe, Wolfman Jérôme, Negulescu Beatrice, Andreazza Pascal, and Ruyter Antoine

Subjects
Physics, QC1-999
Abstract

The interface of a La0.7Sr0.3MnO3/SrTiO3 bilayer was modulated by introducing 3 unit cells of Ba1-xSrxTiO3 using Combinatorial Pulsed Laser Deposition. A wide range of chemical compositions was studied within the same sample, with BSTx stoichiometry variable from 0.5 to 1 along Y-axis, while the SrTiO3 overlayer thickness was modified along the X direction [Fig. 1(a)]. We performed high-resolution, laboratory-based angle-resolved XPS studies of the BSTx film surface providing information on the thickness and composition of the surface and sub-surface layers. Based on the attenuation of the La 3d corelevel photoemission signal from the La0.7Sr0.3MnO3 bottom layer, the BST layer is 1.2 nm thick. XPS Ba 3d5/2 core-level spectra were acquired at positions corresponding to different nominal Ba/Sr stoichiometry. In all measurements, the Ba 3d5/2 core-level spectra can be represented by two main components, i.e. one component at higher binding energy (BE = 780.54 eV) corresponding to surface contribution and the other one at lower binding energy (BE = 778.92 eV) corresponding to sub-surface contribution (Figs. 2 and 3). Going from normal to 60° emission angle and using a 3-unit cell thick film model, the surface to sub-surface intensity ratio clearly evolves providing evidence of a Ba-rich surfactant. The surfactant effect is more significant for lower nominal Ba stoichiometry.

Published
2022
Full Text
View/download PDF

5. Evidence of Ba-rich surface segregation in Ba1-xSrxTiO3 and Ba-rich surfactant in SrTiO3/ Ba1-xSrxTiO3 stacks grown by combinatorial pulsed laser deposition.

Author

Agudelo-Estrada, Santiago, Barrett, Nick, Lubin, Christophe, Wolfman, Jérôme, Negulescu, Beatrice, Andreazza, Pascal, and Ruyter, Antoine

Subjects
*TITANIUM oxides, *PULSED power systems, *PHOTOEMISSION, *ATTENUATION (Physics), *STOICHIOMETRY
Abstract

The interface of a La0.7Sr0.3MnO3/SrTiO3 bilayer was modulated by introducing 3 unit cells of Ba1-xSrxTiO3 using Combinatorial Pulsed Laser Deposition. A wide range of chemical compositions was studied within the same sample, with BSTx stoichiometry variable from 0.5 to 1 along Y-axis, while the SrTiO3 overlayer thickness was modified along the X direction [Fig. 1(a)]. We performed high-resolution, laboratory-based angle-resolved XPS studies of the BSTx film surface providing information on the thickness and composition of the surface and sub-surface layers. Based on the attenuation of the La 3d corelevel photoemission signal from the La0.7Sr0.3MnO3 bottom layer, the BST layer is 1.2 nm thick. XPS Ba 3d5/2 core-level spectra were acquired at positions corresponding to different nominal Ba/Sr stoichiometry. In all measurements, the Ba 3d5/2 core-level spectra can be represented by two main components, i.e. one component at higher binding energy (BE = 780.54 eV) corresponding to surface contribution and the other one at lower binding energy (BE = 778.92 eV) corresponding to sub-surface contribution (Figs. 2 and 3). Going from normal to 60° emission angle and using a 3-unit cell thick film model, the surface to sub-surface intensity ratio clearly evolves providing evidence of a Ba-rich surfactant. The surfactant effect is more significant for lower nominal Ba stoichiometry. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

9. Improving lake mixing process simulations in the Community Land Model by using K profile parameterization

Author

Zhang, Qunhui, Jin, Jiming, Wang, Xiaochun, Budy, Phaedra E., Barrett, Nick, Null, Sarah E., and Copernicus GmbH

Subjects
Mixing Scheme, Profile Parameterization, Other Life Sciences, Vertical, Lake
Abstract

We improved lake mixing process simulations by applying a vertical mixing scheme, K profile parameterization (KPP), in the Community Land Model (CLM) version 4.5, developed by the National Center for Atmospheric Research. Vertical mixing of the lake water column can significantly affect heat transfer and vertical temperature profiles. However, the current vertical mixing scheme in CLM assumes that mixing is driven primarily by wind, and it produces large biases in thermal process simulations. We improved the CLM lake model by using KPP, where vertical mixing was driven by winds and surface thermal forcing, the latter representing the net heat flux in the lake boundary layer. We chose an Arctic Alaskan lake to evaluate this improved lake model. Results demonstrated that KPP could reproduce the observed lake mixing and significantly improved lake temperature simulations when compared to the original mixing scheme in CLM. Our newly improved model better represents the transition between stratification and turnover due to surface thermal forcing combined with high winds. This improved lake model has great potential for reliable physical lake process predictions and better ecosystem services.

Published
2019

10. Proficiency-based progression training: an ‘end to end’ model for decreasing error applied to achievement of effective epidural analgesia during labour: a randomised control study

Author

Kallidaikurichi Srinivasan, Karthikeyan, primary, Gallagher, Anthony, additional, O’Brien, Niall, additional, Sudir, Vinod, additional, Barrett, Nick, additional, O’Connor, Raymund, additional, Holt, Francesca, additional, Lee, Peter, additional, O’Donnell, Brian, additional, and Shorten, George, additional

Published
2018
Full Text
View/download PDF

11. Proficiency-based progression training: an 'end to end' model for decreasing error applied to achievement of effective epidural analgesia during labour: a randomised control study.

Author

Srinivasan, Karthikeyan Kallidaikurichi, Gallagher, Anthony, O'Brien, Niall, Sudir, Vinod, Barrett, Nick, O'Connor, Raymund, Holt, Francesca, Lee, Peter, O'Donnell, Brian, and Shorten, George

Abstract

Background Training procedural skills using proficiencybased progression (PBP) methodology has consistently resulted in error reduction. We hypothesised that implementation of metric-based PBP training and a valid assessment tool would decrease the failure rate of epidural analgesia during labour when compared to standard simulation-based training. Methods Detailed, procedure-specific metrics for labour epidural catheter placement were developed based on carefully elicited expert input. Proficiency was defined using criteria derived from clinical performance of experienced practitioners. A PBP curriculum was developed to train medical personnel on these specific metrics and to eliminate errors in a simulation environment. Seventeen novice anaesthetic trainees were randomly allocated to undergo PBP training (Group P) or simulation only training (Group S). Following training, data from the first 10 labour epidurals performed by each participant were recorded. The primary outcome measure was epidural failure rate. Results A total of 74 metrics were developed and validated. The inter-rater reliability (IRR) of the derived assessment tool was 0.88. Of 17 trainees recruited, eight were randomly allocated to group S and six to group P (three trainees did not complete the study). Data from 140 clinical procedures were collected. The incidence of epidural failure was reduced by 54% with PBP training (28.7% in Group S vs 13.3% in Group P, absolute risk reduction 15.4% with 95% CI 2% to 28.8%, p=0.04). Conclusion Procedure-specific metrics developed for labour epidural catheter placement discriminated the performance of experts and novices with an IRR of 0.88. Proficiency-based progression training resulted in a lower incidence of epidural failure compared to simulation only training. Trial registration number NCT02179879. NCT02185079; Post-results. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

12. Exploring interlayer Dirac cone coupling in commensurately rotated few-layer graphene on SiC(000-1)

Author

Mathieu, Claire, Conrad, Edward H., Wang, Feng, Rault, Julien E., Feyer, Vitaliy, Schneider, Claus M., Renault, Olivier, Barrett, Nick, Institut de Droit Européen des Droits de l'Homme - EA 3976 (IDEDH), Université de Montpellier (UM), Georgia Institute of Technology [Atlanta], Géophysique expérimentale (IPGS) (IPGS-GE), Institut de physique du globe de Strasbourg (IPGS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Peter Grünberg Institut, Centre de Linguistique Inter-langues, de Lexicologie, de Linguistique Anglaise et de Corpus (CLILLAC-ARP (EA_3967)), Université Paris Diderot - Paris 7 (UPD7), Laboratoire d'Electronique et des Technologies de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Laboratoire d'Etude des NanoStructures et Imagerie de Surface (LENSIS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Peter Grünberg Institut (PGI), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed Matter::Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

We investigate electronic band-structure images in reciprocal space of few layer graphene epitaxially grown on SiC(000-1). In addition to the observation of commensurate rotation angles of the graphene layers, the k-space images recorded near the Fermi edge highlight structures originating from diffraction of the Dirac cones due to the relative rotation of adjacent layers. The 21.9{\deg} and 27{\deg} rotation angles between two sheets of graphene are responsible for a periodic pattern that can be described with a superlattice unit cells. The superlattice generates replicas of Dirac cones with smaller wave vectors, due to a Brillouin zone folding., Comment: 11 pages, 4 figures

Published
2014

13. Failure on footpaths

Author

Barrett, Nick

Subjects
Banking, finance and accounting industries, Business, Business, international
Abstract

From Mr Nick Barrett. Sir, It was reassuring to read that regional tourist centres have benefited from the reopening of footpaths in the countryside after the foot-and-mouth crisis ('Tourism still [...]

Published
2002

16. Doing Manchester justice.

Author

Barrett, Nick

Subjects
COURTHOUSE design & construction, ARCHITECTURE
Abstract

The article features the design and construction of Manchester Civil Justice Centre (MCJC). The steel-framed building of the MCJC was considered as a big success, marking a change from the traditional architectural approach based on its red brick Victorian industrial heritage. The MCJC was designed by Denton Corker Marshall who were praised for extending Manchester's tradition of innovative architecture and urban design.

Published
2008

17. Low-energy electron control over physical and chemical properties of organic aromatic thin layers at the micrometre scale

Author

Wu, Qiang, Sala, Leo, Amiaud, Lionel, Mathieu, Claire, Lubin, Christophe, Lafosse, Anne, Barrett, Nick, Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Amiaud, Lionel

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry, Low energy electron irradiation, HREELS, SAM, work function tuning, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], chemical modification, [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], LEEM
Abstract

The collimated monochromatic low-energy (≤ 50 eV) electron beam delivered by a low energy electron microscope (LEEM) was used to locally modify organic molecular thin films at the micrometre-scale. Self-Assembled Monolayers (SAMs) of p-terphenylthiol (TPT) anchored on gold substrates were used as model organic layers. The local work function (WF) was observed to decrease as a consequence of electron irradiation and to be tuneable using the irradiation energy and/or the dose as control parameters. The chemical origin of the observed WF changes could be discussed in the light of available vibrational analyses of irradiated TPT SAMs performed using High-Resolution Electron Energy Loss Spectroscopy (HREELS) and by comparing the effective cross sections estimated for WF modulation and for chemical modifications, respectively. The hydrogen content of the organic thin film was shown to be the determining parameter, rather than the degree of aromaticity of the hydrogenated carbon centres. Finally, the imprinted modifications were observed to have a moderate stability after air exposure by combining Photoemission Electron Microscopy (PEEM) and HREELS.

18. Housing's big shake-up

Author

Barrett, Nick

Subjects
Real estate industry -- United Kingdom, Real estate agents and brokers -- United Kingdom, Advertising, marketing and public relations, Business, Business, international
Published
1988

19. Moving out of the frame

Author

Barrett, Nick

Subjects
Barratt Developments PLC -- Marketing, House framing -- Quality management, Construction industry -- Marketing, Wooden-frame houses -- Market share, Advertising, marketing and public relations, Business, Business, international
Published
1988

20. Barker and Dobson is a minty bit stronger

Author

Barrett, Nick

Subjects
Barker and Dobson Group PLC -- Mergers, acquisitions and divestments, Alma Holdings -- Mergers, acquisitions and divestments, Candy industry -- Mergers, acquisitions and divestments, Advertising, marketing and public relations, Business, Business, international
Published
1988

21. Poor prospects for a saturated high street

Author

Barrett, Nick

Subjects
Department stores -- Securities, Supermarkets -- Securities, Advertising, marketing and public relations, Business, Business, international
Published
1988

22. School building freed from suspension.

Author

Barrett, Nick

Subjects
SCHOOL building design & construction, CONSTRUCTION contracts, IRON & steel building
Abstract

The article discusses the investment of 1,000 million British pounds for the on site construction of school buildings in 2013 based on the Autumn Financial Statement of Chancellor of the Exchequer George Osborne in December 2012. Education building will benefit from the investment which allegedly prioritises steel construction as a method. It offers a brief description of the Building Schools for the Futures program, the Priority School Building Programme, and the Private Finance Initiative.

Published
2013

23. The case for steel.

Author

Barrett, Nick

Subjects
IRON & steel building, STEEL, CONSTRUCTION materials, CONSTRUCTION industry
Abstract

The article discusses why building designers in Great Britain choose steel as the primary choice for building material. According to the article, developers, designers and contractors alike opt for the use of steel due to safety considerations. Moreover, steel meets most strict requirements for vibration performance without any special strengthening as well as being the most sustainable among other construction materials.

Published
2008

24. GIANT STEPS TAKEN TOWARDS REDUCED CARBON FOOTPRINTS.

Author

Barrett, Nick

Subjects
EMISSION control, SOCIAL responsibility of business, STEEL industry, CONTRACTORS
Abstract

The article discusses the efforts of Barrett Steel Buildings to reduce its carbon emissions. The company claims it is the first steelwork contractor in Great Britain to measure and reduce its carbon footprint, in a joint effort with the Steel Construction Institute (SCI) and dCarbon8. Barrett managing director Richard Barrett hopes that the company's move of analyzing its carbon footprint could help other organizations by being a benchmark across the industry. INSET: USING STEEL MAXIMISES RE-USE..

Published
2007

25. STEEL AND SUSTAINABILITY.

Author

Barrett, Nick

Subjects
SUSTAINABLE buildings, STRUCTURAL steel, STRENGTH of materials, RECYCLABLE material, IRON & steel building
Abstract

The article presents an overview of the credentials of steel for sustainable development. It is indicated that the most obvious sustainability strength of steel is its ability to be recycled and reused. Constructional steelwork, which is manufactured in factory-controlled conditions, has health and safety benefits to the workforce within the community. It is added that construction programs can also be reduced because of the inherent speed and predictability of steel construction.

Published
2007

26. STEEL'S POPULARITY UNDERPINNED BY COSTS.

Author

Barrett, Nick

Subjects
CONCRETE construction, COMMERCIAL building design & construction, SURVEYS, COST effectiveness, CONSTRUCTION materials, STEEL
Abstract

The article discusses the results of the Cost Comparison Survey, which compares the relative costs of constructing two commercial building in steel and concrete. The study, which was commissioned by Corus, revealed that steel remains the cost effective choice for structural framing solutions. Corus general manager Alan Todd noted that steel remains the leading choice even when only direct costs are considered. The results reinforce the findings of the annual Market Share Survey.

Published
2007

27. CORUS ON ADVANCE.

Author

Barrett, Nick

Subjects
STRUCTURAL steel
Abstract

The article presents information on the Advance range of structural steel sections from Corus.

Published
2006

28. STEEL FRAMES BRITISH LAND'S SUSTAINABILITY STRATEGY. .

Author

Barrett, Nick

Subjects
STEELWORK, EXECUTIVES, STEEL, CONTRACTORS
Abstract

The article presents an interview with Richard Elliot, head of construction at property company British Land. He remarks on the role of steel in the projects of the company. According to him, the quality of a manufacturing facility and the straightforwardness of contractors and suppliers are among the qualities that are significant to a steelwork contractor. He hopes to see improvement in communication between designers and steelwork contractors.

Published
2006

30. INTUMESCENTS REDUCING DEVELOPERS' COSTS.

Author

Barrett, Nick

Subjects
SURFACE coatings, SEMINARS, CONSTRUCTION industry
Abstract

Focuses on the offsite application of intumescent coatings, highlighted at a seminar held by the construction industry in London, England. Views of Corus Construction and Industrial executive John Dowling on the popularity of intumescent coatings in 2004; Benefits of the use of intumescent for developers, according to Waterman Partnership senior associate director Barry Dobins; Development of intumescents.

Published
2005

Catalog

Books, media, physical & digital resources
See catalog results