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June 2014 Society Meetings Society and Events SHEPHARD PRIZE: NEW PRIZE Meetings for MATHEMATICS 2014 and Events Following a Very Generous Tions Open in Late 2014
LONDONLONDON MATHEMATICALMATHEMATICAL SOCIETYSOCIETY NEWSLETTER No. 437 June 2014 Society Meetings Society and Events SHEPHARD PRIZE: NEW PRIZE Meetings FOR MATHEMATICS 2014 and Events Following a very generous tions open in late 2014. The prize Monday 16 June donation made by Professor may be awarded to either a single Midlands Regional Meeting, Loughborough Geoffrey Shephard, the London winner or jointly to collaborators. page 11 Mathematical Society will, in 2015, The mathematical contribution Friday 4 July introduce a new prize. The prize, to which an award will be made Graduate Student to be known as the Shephard must be published, though there Meeting, Prize will be awarded bienni- is no requirement that the pub- London ally. The award will be made to lication be in an LMS-published page 8 a mathematician (or mathemati- journal. Friday 4 July cians) based in the UK in recog- Professor Shephard himself is 1 Society Meeting nition of a specific contribution Professor of Mathematics at the Hardy Lecture to mathematics with a strong University of East Anglia whose London intuitive component which can be main fields of interest are in page 9 explained to those with little or convex geometry and tessella- Wednesday 9 July no knowledge of university math- tions. Professor Shephard is one LMS Popular Lectures ematics, though the work itself of the longest-standing members London may involve more advanced ideas. of the LMS, having given more page 17 The Society now actively en- than sixty years of membership. Tuesday 19 August courages members to consider The Society wishes to place on LMS Meeting and Reception nominees who could be put record its thanks for his support ICM 2014, Seoul forward for the award of a in the establishment of the new page 11 Shephard Prize when nomina- prize. -
Press Release
Press release 13 August 2014 Two Fields Medals 2014 awarded to ERC laureates The 2014 Fields Medals were awarded today to four outstanding mathematicians, of whom two are grantees of the European Research Council (ERC): Prof. Artur Avila (Brazil-France), an ERC Starting grant holder since 2010, and Prof. Martin Hairer (Austria) has been selected for funding under an ERC Consolidator grant in 2013. They received the prize respectively for their work on dynamical systems and probability, and on stochastic analysis. The other two laureates are Prof. Manjul Barghava (Canada-US) and Prof. Maryam Mirzakhani (Iran). The Medals were announced at the International Congress of Mathematicians (ICM) taking place from 13 – 21 August in Seoul, South Korea. On the occasion of the announcement, ERC President Prof. Jean-Pierre Bourguignon, a mathematician himself, said: “On behalf of the ERC Scientific Council, I would like to congratulate warmly all four Fields Medallists for their outstanding contributions to the field of mathematics. My special congratulations go to Artur Avila and Martin Hairer, who are both brilliant scientists supported by the ERC. We are happy to see that their remarkable talent in the endless frontiers of science has been recognised. The Fields Medals awarded today are also a sign that the ERC continues to identity and fund the most promising researchers across Europe; this is true not only in mathematics but in all scientific disciplines.” EU Commissioner for Research, Innovation and Science, Máire Geoghegan-Quinn, said: “I would like to congratulate the four laureates of the Fields Medal announced today. The Fields Medal, the highest international distinction for young mathematicians, is a well- deserved honour for hardworking and creative young researchers who push the boundaries of knowledge. -
Photons That Travel in Free Space Slower Than the Speed of Light Authors
Title: Photons that travel in free space slower than the speed of light Authors: Daniel Giovannini1†, Jacquiline Romero1†, Václav Potoček1, Gergely Ferenczi1, Fiona Speirits1, Stephen M. Barnett1, Daniele Faccio2, Miles J. Padgett1* Affiliations: 1 School of Physics and Astronomy, SUPA, University of Glasgow, Glasgow G12 8QQ, UK 2 School of Engineering and Physical Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK † These authors contributed equally to this work. * Correspondence to: [email protected] Abstract: That the speed of light in free space is constant is a cornerstone of modern physics. However, light beams have finite transverse size, which leads to a modification of their wavevectors resulting in a change to their phase and group velocities. We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam’s transverse spatial structure. Using time-correlated photon pairs we show a reduction of the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam. In both cases, the delay is several microns over a propagation distance of the order of 1 m. Our work highlights that, even in free space, the invariance of the speed of light only applies to plane waves. Introducing spatial structure to an optical beam, even for a single photon, reduces the group velocity of the light by a readily measurable amount. One sentence summary: The group velocity of light in free space is reduced by controlling the transverse spatial structure of the light beam. Main text The speed of light is trivially given as �/�, where � is the speed of light in free space and � is the refractive index of the medium. -
Arxiv:1603.00726V1 [Physics.Optics] 2 Mar 2016
Single-pixel 3D imaging with time-based depth resolution Ming-Jie Sun,1, 2, ∗ Matthew. P. Edgar,2 Graham M. Gibson,2 Baoqing Sun,2 Neal Radwell,2 Robert Lamb,3 and Miles J. Padgett2, y 1Department of Opto-electronic Engineering, Beihang University, Beijing, 100191, China 2SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK 3Selex ES, Edinburgh, UK Time-of-flight three dimensional imaging is an important tool for many applications, such as object recognition and remote sensing. Unlike conventional imaging approach using pixelated detector array, single-pixel imaging based on projected patterns, such as Hadamard patterns, utilises an alternative strategy to acquire information with sampling basis. Here we show a modified single-pixel camera using a pulsed illumi- nation source and a high-speed photodiode, capable of reconstructing 128×128 pixel resolution 3D scenes to an accuracy of ∼ 3 mm at a range of ∼ 5 m. Furthermore, we demonstrate continuous real-time 3D video with a frame-rate up to 12 Hz. The sim- plicity of the system hardware could enable low-cost 3D imaging devices for precision ranging at wavelengths beyond the visible spectrum. Introduction Whilst a variety of 3D imaging technologies are suited for different applications, time-of-flight (TOF) systems have set the benchmark for performance with regards to a combination of accuracy and operating range. Time-of-flight imaging is performed by illuminating a scene with a pulsed light source and observing the back-scattered light. Correlating the detection time of the back-scattered light with the time of the illumination pulse allows the distance, d, to objects within the scene to be estimated by d = tc=2, where t is the TOF and c is the propagation speed of light. -
This Thesis Has Been Submitted in Fulfilment of the Requirements for a Postgraduate Degree (E.G
This thesis has been submitted in fulfilment of the requirements for a postgraduate degree (e.g. PhD, MPhil, DClinPsychol) at the University of Edinburgh. Please note the following terms and conditions of use: This work is protected by copyright and other intellectual property rights, which are retained by the thesis author, unless otherwise stated. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the author. The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the author. When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given. Structural and Magnetic Properties of the Geometrically Frustrated 3d and 5d = 1 s 2 Double Perovskites Sr2CuWO6, Ba2YWO6 and LaSrMgWO6 Oliver Burrows Doctor of Philosophy The University of Edinburgh August 2016 Lay Summary of Thesis With the development of quantum mechanics in the early 20th century, an understanding of the microscopic behaviour of magnetic materials was gained. With the revelations afforded by this discipline, however, came a tendency in some quarters towards a reductionist viewpoint of science: that chemistry was merely physics applied on a larger scale. Similarly, biology was considered by some to be be merely “scaled-up” chemistry, and psychology was simply a consequence of the rules governing biology, applied on the scale of an organism. Such a simplistic argument ignores the concept of emergent phenomena. -
Annual Report 2017-2018
Annual Review 2017 | 2018 ONTENTS C 1 Overview 1 2 Profile 4 3 Research 6 4 Events 9 5 Personnel 13 6 Mentoring 17 7 Structures 18 APPENDICES R1 Highlighted Papers 20 R2 Complete List of Papers 23 E1 HIMR-run Events 29 E2 HIMR-sponsored Events 31 E3 Focused Research Events 39 E4 Future Events 54 P1 Fellows Joining in 2017|2018 59 P2 Fellows Leaving since September 2017 60 P3 Fellows Moving with 3-year Extensions 62 P4 Future Fellows 63 M1 Mentoring Programme 64 1. Overview This has been another excellent year for the Heilbronn Institute, which is now firmly established as a major national mathematical research centre. HIMR has developed a strong brand and is increasingly influential in the UK mathematics community. There is currently an outstanding cohort of Heilbronn Research Fellows doing first-rate research. Recruitment of new Fellows has been most encouraging, as is the fact that many distinguished academic mathematicians continue to work with the Institute. The research culture at HIMR is excellent. Members have expressed a high level of satisfaction. This is especially the case with the Fellows, many of whom have chosen to continue their relationships with the Institute. Our new Fellows come from leading mathematics departments and have excellent academic credentials. Those who left have moved to high-profile groups, including several to permanent academic positions. We currently have 29 Fellows, hosted by 6 universities. We are encouraged by the fact that of the 9 Fellows joining us this year, 5 are women. The achievements of our Fellows this year again range from winning prestigious prizes to publishing in the elite mathematical journals and organising major mathematical meetings. -
Curriculum Vitae with Track Record (January 2018) Professor Dr. Ir. A. T. J. Van Helvoort
Curriculum vitae with track record (January 2018) Professor dr. ir. A. T. J. van Helvoort PERSONAL INFORMATION Family name, First name: van Helvoort, Antonius Theodorus Johannes Date of birth: 15.06.1973 Sex: male Nationality: Dutch Researcher unique identifiers: ORCID 0000-0001-6437-1474, ResearcherID: A-1400-2013 URL for personal web site: http://www.ntnu.edu/employees/a.helvoort EDUCATION 2002 PhD: Disputation date: 06.12.2002. Materials Science & Metallurgy, Cambridge University (Corpus Christi College), UK 1999 Master Natural Sciences/Materials Science, Delft technical University, the Netherlands CURRENT AND PREVIOUS POSITIONS 2014-…. Current Position: Professor Norwegian University of Science and Technology (NTNU)/ Faculty of Natural Sciences/Department of Physics, Trondheim, Norway. 2007-2014…. Previous position held: associate professor Norwegian University of Science and Technology (NTNU)/ Faculty of Natural Sciences/Department of Physics, Trondheim, Norway. 2005-2007 Previous position held: Researcher SINTEF Materials and Chemistry (Materials Physics), Trondheim, Norway. FELLOWSHIPS 2014-2015 Byfellow Churchill College Cambridge, UK MOBILITY 2014-2015 Department of Materials Science and Metallurgy/Electron Microscopy Croup, University of Cambridge/UK The sabbatical leave was award and financed by the faculty of Natural Sciences & Technology, Norwegian University of Science and Technology (NTNU). SUPERVISION OF GRADUATE STUDENTS AND RESEARCH FELLOWS 2007-…. 5 PhDs as main supervisor of which 3 finished. 2007-…. 7 PhDs as co-supervisor of which 2 finished 2003-…. 38 project/diploma(MSc)/exchange students. Norwegian University of Science and Technology (NTNU)/ Faculty of Natural Sciences/Department of Physics, Trondheim, Norway. TEACHING ACTIVITIES (NTNU, Department of Physics) 2015 General Physic lab non-physic students (lab coordination). (BSc level) 2008-2014 Nanotools – Characterization Nanomaterials. -
Midgley Abstract
MONASH CENTRE FOR ELECTRON MICROSCOPY SEMINAR Electron tomography – a new perspective for materials microscopy Dr Paul Midgley Department of Materials Science and Metallurgy University of Cambridge Friday 13 July, 2007, 2:00 p.m. – 3.00 p.m. Science Lecture Theatre S11, Bldg 25 Abstract Within materials science and engineering, the push for nanotechnology and the increasing use of nanoscale materials brings with it the need for high spatial resolution imaging and analysis. As the lateral dimensions of a feature approach that of its depth, as is happening for example in many semiconductor fabrication lines, electron microscopy is being pushed towards examining truly 3-dimensional objects and a single projection is not adequate for a complete description. To that end electron tomography has been adapted from the original ideas proposed in the life sciences to meet the needs of the materials scientist working at the nanoscale. Although electron tomography in the life sciences relies on a tilt series of bright field (BF) images exhibiting predominantly mass-thickness contrast, in materials science, for a general crystalline object, diffraction (and Fresnel) contrast very often prohibits the use of (coherent) BF images for electron tomographic reconstruction. Normally, other (incoherent) signals must be used. As such, high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging has been developed as the basis for the tomography tilt series and has become the conventional mode for materials-based electron tomography. However, STEM HAADF imaging will not reveal certain important electronic, compositional and structural properties of many materials and so more unconventional modes are also under development. -
The Rapidly Changing Face of Electron Microscopy
Chemical Physics Letters 631–632 (2015) 103–113 Contents lists available at ScienceDirect Chemical Physics Letters jou rnal homepage: www.elsevier.com/locate/cplett FRONTIERS ARTICLE The rapidly changing face of electron microscopy ∗ John Meurig Thomas , Rowan K. Leary, Alexander S. Eggeman, Paul A. Midgley Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK a r t i c l e i n f o a b s t r a c t Article history: This short but wide-ranging review is intended to convey to chemical physicists and others engaged in Received 7 April 2015 the interfaces between solid-state chemistry and solid-state physics the growing power and extensive In final form 29 April 2015 applicability of multiple facets of the technique of electron microscopy. Available online 7 May 2015 © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 1. Introduction There is, however, another kind of 4D EM [9–11], which is the revolutionary one introduced by Zewail and co-workers that Fifty years ago electron microscopy (EM) had already made a achieves ultra-fast EM at the femtosecond time-scale, while also profound impact both on molecular biology and metallurgy. A neg- reaching near atomic resolution. This remarkable technical advance ative staining method for high-resolution EM of viruses soon led to has improved temporal resolution of imaging and spectra, gen- major progress in three-dimensional (3D) image reconstructions erated by EM, by some 10 orders of magnitude compared with of small viruses [1–3]; and the reality of the existence, movement the video recording rates still used extensively by microscopists. -
13Th International Conference on Microscopy of Semiconducting
process is, however, not suitable for coat- In the session on applications, several Transmission electron microscopy re- ed conductors. N. Kashima (Chubu speakers discussed the requirements of vealed several interfacial reactions in the Electric Power, Japan) reported the success- coated conductors for devices such as tape. Controlling the grain-boundary ful deposition of 100-m lengths of YBCO transmission cables, generators, motors, chemistry is also important. M. Suenaga on rolled, non-textured Ag tape using a fault current limiters, and magnetic-levita- (Brookhaven National Laboratory, USA) six-stage MOCVD system. S. Sambasivan tion systems. Coated conductors are said that as the critical currents of the (Applied Thin Films, USA) reported a attractive for these devices because of the tapes become increasingly large, the so-far method for preparing YSZ buffer layers by potential for lower cost, low ac loss, opera- neglected investigation of the cryostability the oxidation of YZN (yttria-stabilized zir- tion at a higher temperature and higher of the coated conductors will also become conium nitride) films deposited directly on critical current, and reduced component an important issue. Y. Shiohara predicted both textured Ni and Ni-Cr tapes by reac- size. Most speakers projected that a cost of the availability of long lengths of YBCO- coated conductors by 2006. He also pre- tive sputtering in N2 atmospheres. RABiTS $50/kA m has to be achieved in order for tapes of more than 10 m in length are being coated conductors to be used in electric- dicted that there would be a crossover produced at Oak Ridge and at 3M. -
PDF in English
:RUOG6FLHQWLÀF Newsletter No. 39 • October 2014 World Scientific publishes acclaimed new book Fields Medallists’ Lectures, 3rd Edition edited by Sir Michael Atiyah (University of Edinburgh, UK), Daniel Iagolnitzer (CEA-Saclay, France), Chitat Chong (National University of Singapore) John W. MilnorEnrico Bombieri Gerd Faltings Andrei Okounkov Terence Tao Cédric Villani Elon Lindenstrauss Ngô Båo Châu Stanislav Smirnov Manjul Bhargava Martin Hairer lthough the Fields Medal does not have the same public The third edition of Fieldsds recognition as the Nobel Prize, they share a similar Medallists’ Lectures featuress Aintellectual standing. It is restricted to one field — that additional contributions from: of mathematics. The medal is awarded to the best mathematicians John W. Milnor (1962), Enricoo who are 40 or younger, every four years. Bombieri (1974), Gerd Faltingsgs A list of Fields Medallists and their contributions provides (1986), Andrei Okounkov (2006), TTerence TTao (2006)(2006), CédCédrici a bird’s eye view of the major developments in mathematics Villani (2010), Elon Lindenstrauss (2010), Ngô Båo Châu over the past 80 years. It highlights the areas in which, at (2010), Stanislav Smirnov (2010), Manjul Bhargava (2014) and various times, the greatest progress has been made. Martin Hairer (2014). At approximately 1000 pages, this new edition will be published in two volumes. The Lives and Works of 33 Nobel Laureates in Crystallography presented in new book From a Grain of Salt to the Ribosome his book is published to Sweden), Anders Liljas (Lund University, Sweden), Sven Lidin celebrate the Interna- (Lund University, Sweden), From a Grain of Salt to the T tional Year of Crystall- Ribosome: The History of Crystallography as Seen Through the ography 2014, as proclaimed by Lens of the Nobel Prize describes the lives and works of 33 Nobel the United Nations. -
Ultrafast Crystal Structure Determination of Pharmaceutical Compounds Using TEM Electron Diffraction Without Cooling Techniques
CRYSTAL STRUCTURE DETERMINATION OF PHARMACEUTICALS WITH ELECTRON DIFFRACTION Dr. Partha Pratim Das Application Specialist, NanoMEGAS SPRL, Belgium [email protected] www.nanomegas.com This document was presented at PPXRD - Pharmaceutical Powder X-ray Diffraction Symposium Sponsored by The International Centre for Diffraction Data This presentation is provided by the International Centre for Diffraction Data in cooperation with the authors and presenters of the PPXRD symposia for the express purpose of educating the scientific community. All copyrights for the presentation are retained by the original authors. The ICDD has received permission from the authors to post this material on our website and make the material available for viewing. Usage is restricted for the purposes of education and scientific research. PPXRD Website – www.icdd.com/ppxrd ICDD Website - www.icdd.com Free transnational access to the most advanced TEM equipment and skilled operators for HR(S)TEM, EELS, EDX, Tomography, Holography and various in-situ state-of-the-art experiments X 2 SME participate CEOS NanoMEGAS X-ray Crystallography Neutron Electron Emerging new technique Why using electron crystallography ? STRUCTURE ANALYSIS WITH ELECTRON DIFFRACTION Why electrons? 104-5 times stronger interaction with matter compared with X-ray . single crystal data on powder sample . short data collection time - X- Ray peaks broaden with crystals of nm range With Electron microscope we can study nm- and micro-sized crystals STRUCTURE ANALYSIS WITH TEM TEM : Electron diffraction advantages Every TEM (electron microscope) TEM goniometer may produce ED patterns and HREM from individual single nanocrystals ED information: Cell parameter and symmetry determination Measuring intensity values leads to structure determination Nicola Pinna, Progr Colloid Polym Sci 130 (2005) 29-32 Nicola Pinna et al., Adv.