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Galaxy Dynamics: The chemical evolution side

Series
Theoretical Physics - From Outer Space to Plasma
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Dr Ralph Schoenrich will talk about the chemical evolution side
Spiral density waves patterns re-distribute stars throughout the entire system, making it impossible to know a star's origin from just its kinematics. However, stars are more than just points in phase space: every star is labelled with the elemental abundances of the gas cloud from which it was formed. Over the last few years a number of observational campaigns have started to measure these labels for millions of stars in our own Galaxy's disc. Ralph Schoenrich will describe how chemodynamical models are being used to piece together the evolution of our Galactic environment from presolar times to the present.

Episode Information

Series
Theoretical Physics - From Outer Space to Plasma
People
Ralph Schoenrich
Keywords
galaxy
gravity
dynamics
Department: Department of Physics
Date Added: 25/01/2018
Duration: 00:39:04

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Literacy and foundation learning in multilingual India

Series
Department of Education Public Seminars
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Dr Sonali Nag, Oxford Departmant of Education, gives a talk for the public seminar series hosted by the department's Families, Effecrive Learning and Literacy Research Group

Episode Information

Series
Department of Education Public Seminars
People
Dr Sonali Nag
Keywords
language
linguistics
literacy
learning
children
india
Department: Department of Education
Date Added: 25/01/2018
Duration: 01:01:45

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Galaxy Dynamics: The dynamics of galaxy discs

Series
Theoretical Physics - From Outer Space to Plasma
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Dr John Magorrian will talk about the dynamics of galaxy discs
In galaxy discs it is energetically favourable for angular momentum to move outwards and mass to move inwards. This transportation is effected by spiral arms, but what causes them? Simple linear response calculations demonstrate that even the smallest perturbation is amplified manyfold, while the differential rotation of the disc means that the response is stretched out into a spiral-like pattern. John Magorrian will introduce the notion of the disc as a resonant cavity, within which spiral density perturbations rattle back and forth.

Episode Information

Series
Theoretical Physics - From Outer Space to Plasma
People
John Magorrian
Keywords
galaxy
gravity
dynamics
Department: Department of Physics
Date Added: 25/01/2018
Duration: 00:44:24

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Galaxy Dynamics: Stellar systems: a new state of matter

Series
Theoretical Physics - From Outer Space to Plasma
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Prof James Binney FRS will talk about stellar systems: a new state of matter
The long range of gravity means that many concepts from undergraduate statistical mechanics do not apply: energy is not extensive; there is no microcanonical or canonical ensemble. Stars and dark matter particles have long mean free paths, which means that to a very good approximation their motion is determined by the mean-field gravitational potential. James Binney will identify a hierarchy of timescales, explaining how the Boltzmann equation for the full 6N-dimensional many-particle phase space distribution function can be reduced to an evolutionary equation of a function of a mere 3 variables that is governed by the resonances among the particles' orbital frequencies.

Episode Information

Series
Theoretical Physics - From Outer Space to Plasma
People
James Binney
Keywords
galaxy
gravity
dynamics
Department: Department of Physics
Date Added: 25/01/2018
Duration: 00:51:19

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Imagining the Divine: Art and the Rise of World Religions

Series
TORCH | The Oxford Research Centre in the Humanities
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Mary Beard and Neil MacGregor in conversation

Episode Information

Series
TORCH | The Oxford Research Centre in the Humanities
People
undefined
Keywords
imagining
divine
art
history
material
culture
empires
faith
torch
Department: The Oxford Research Centre in the Humanities (TORCH)
Date Added: 24/01/2018
Duration: 01:09:15

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Mixed methods in the real world: a messy business?

Series
Evidence-Based Health Care
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Dr Katherine Pollard gives a talk for the Evidence Based Healthcare seminar series.

This talk focuses on mixed methods research in health care education and practice, drawing on Kathy's experience of two large mixed methods projects to demonstrate salient issues: a longitudinal evaluation of an interprofessional undergraduate curriculum and a case study of quality measurement in community nursing. Kathy discusses research design and implementation, highlighting the challenges that arose, and the strategies employed to ensure successful project delivery.

Dr Pollard has been an active researcher since 1998 and is currently employed as a Senior Research Fellow at the University of the Wet of England, Bristol. She has a clinical background in midwifery.

Creative Commons Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK (BY-NC-SA): England & Wales; https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
Evidence-Based Health Care
People
Katherine Pollard
Keywords
EBM
Evidence-Based Medicine
Primary Care
Health Sciences
EBHC
Evidence-Based Health Care
Department: Medical Sciences Division
Date Added: 24/01/2018
Duration:

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How To Think About Limited War (Without Limiting Your Thinking)

Series
Changing Character of War
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'Limited War' is one of the terms making a frequent appearance in the strategic studies, international relations, and military history realms over the last 70 years.

What does 'Limited War' mean? When do we know we are in one? What unique problems arise when waging one? What are the problems with ending them? And what should states do to secure a lasting peace? Distinguished Vienna Diplomatic Academy Fulbright Professor Donald Stoker discusses these issues and others by drawing upon what he has learned researching the subject for his forthcoming book from Cambridge University Press.

Donald Stoker, PhD, was Professor of Strategy and Policy for the US Naval War College’s Monterey Program at the Naval Postgraduate School in Monterey, California, from 1999 until 2017. The author or editor of eight books, his Carl von Clausewitz: His Life and Work (Oxford University Press, 2014), is on the British Army professional reading list. His The Grand Design: Strategy and the US Civil War, 1861-1865 (Oxford University Press, 2010), won the prestigious Fletcher Pratt award, was a Main Selection of the History Book Club, and is on the US Army Chief of Staff’s reading list. In 2016, he was a Fellow of the Changing Character of War Programme at the University of Oxford’s Pembroke College. He is currently writing a book on limited war for Cambridge University Press and is the Fulbright Distinguished Professor of Political Science at the Diplomatic Academy in Vienna, Austria.

This event was part-sponsored by the US-UK Fulbright Commission

Episode Information

Series
Changing Character of War
People
Donald Stoker
Keywords
international relations
strategic studies
military history
clausewitz
changing character of war
Department: Pembroke College
Date Added: 24/01/2018
Duration:

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Proving International Crimes

Series
Public International Law Discussion Group (Part II)
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International criminal tribunals face an enormous task when they seek to analyse the thousands of pages of evidence that are presented in the course of their trials...
Abstract

International criminal tribunals face an enormous task when they seek to analyse the thousands of pages of evidence that are presented in the course of their trials, and to draw conclusions on the guilt or innocence of accused persons based on that evidence. Yet, whilst rules of admissibility have been subjected to a great deal of academic commentary, many key debates relating to proof in international criminal trials have remained under-theorised to date. This paper discusses the evaluation of evidence in international criminal trials. It argues that, despite over two decades of practice in contemporary international criminal tribunals, no consistent approach as to how judges should weigh evidence and use it for fact-finding has emerged. The quality of evidence required to meet the standard of proof at different stages of proceedings in the International Criminal Court remains uncertain. Furthermore, it shall be argued that the structure of international criminal judgments can detract from the clarity of their findings, and this in turn has an impact on their legal and sociological legitimacy.

Bio:

Yvonne McDermott Rees is Associate Professor of Law at the Hillary Rodham Clinton School of Law, Swansea University. She is the author of Fairness in International Criminal Trials (Oxford University Press, 2016) and over 50 journal articles and book chapters on international criminal procedure, human rights, and the law of evidence in international criminal trials. She is an Academic Fellow of the Honourable Society of the Inner Temple, and a Door Tenant at Invictus Chambers, London.

Episode Information

Series
Public International Law Discussion Group (Part II)
People
Yvonne McDermott Rees (Swansea University)
Keywords
criminal tribunals
public international law
fact-finding
Department: Faculty of Law
Date Added: 23/01/2018
Duration: 00:33:42

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Inferring Scope through Syntactic Sugar

Series
International Conference on Functional Programming 2017
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Justin Pombrio (Brown University, USA) gives the third talk in the fifth panel, Inference and Analysis on the 3rd day of the ICFP conference.
Co-written by Shriram Krishnamurthi (Brown University, USA) and Mitchell Wand (Northeastern University, USA).

Many languages use syntactic sugar to define parts of their surface language in terms of a smaller core. Thus some properties of the surface language, like its scoping rules, are not immediately evident. Nevertheless, IDEs, refactorers, and other tools that traffic in source code depend on these rules to present information to users and to soundly perform their operations. In this paper, we show how to lift scoping rules defined on a core language to rules on the surface, a process of scope inference. In the process we introduce a new representation of binding structure--scope as a preorder--and present a theoretical advance: proving that a desugaring system preserves alpha-equivalence even though scoping rules have been provided only for the core language. We have also implemented the system presented in this paper.
Creative Commons Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK (BY-NC-SA): England & Wales; https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
International Conference on Functional Programming 2017
People
Justin Pombrio
Keywords
computing
programming
technology
Department: Department of Computer Science
Date Added: 23/01/2018
Duration: 00:17:29

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Automating Sized-Type Inference for Complexity Analysis

Series
International Conference on Functional Programming 2017
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Martin Avanzini (University of Innsbruck, Austria) gives the second talk in the fifth panel, Inference and Analysis on the 3rd day of the ICFP conference.
This paper introduces a new methodology for the complexity analysis of higher-order functional programs, which is based on three ingredients: a powerful type system for size analysis and a sound type inference procedure for it, a ticking monadic transformation and constraint solving. Noticeably, the presented methodology can be fully automated, and is able to analyse a series of examples which cannot be handled by most competitor methodologies. This is possible due to various key ingredients, and in particular an abstract index language and index polymorphism at higher ranks. A prototype implementation is available.
Creative Commons Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK (BY-NC-SA): England & Wales; https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
International Conference on Functional Programming 2017
People
Martin Avanzini
Keywords
computing
programming
technology
Department: Department of Computer Science
Date Added: 23/01/2018
Duration: 00:18:50

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