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Speaker: Prof. David Attwood, University of California, Berkley, USA
Date: 2012-01-26
Time: 15:00
Place: Physics Department, Auditorium B, Lund University
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Abstract: An overview of nanoscale x-ray imaging is presented with applications to broad areas of science, based onresults at several laboratories worldwide. Areas of application include the life sciences, materials science, environmental sciences, archeology, and industrial tomography. Present studies at synchrotron radiation facilities achieve 10 nm spatial resolution, with both soft and hard x-rays, but are relatively static, with exposure times measured in seconds. However, free electron lasers (FELs) are just becoming available that will allow dynamical x-ray studies to 10's femtoseconds, a path already pursued at longer EUV wavelengths with laboratory scale high harmonic techniques.
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Speaker: Prof. Inger Andersson, Department of Molecular Biology, Swedish University of Agricultural Science, Uppsala, Sweden.
Date: 2011-11-02
Time: 14:15
Place: Chemistry Department, Lecture Hall B, Getingevägen 60, 222 41 LUND.
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Abstract: Much of what we know about the detailed structure of biomolecules, including proteins and DNA and RNA has come through the use of X-ray diffraction. Synchrotron radiation has revolutionized this field in the past three decades, enabling the study of larger and more complex systems at increasingly higher levels of resolution and on smaller and smaller crystals. However, structure determination of individual cells and organelles has proven intractable using conventional structural etermination techniques: these are nonreproducible and do not crystallize, thus cannot be imaged using X-ray crystallography. A large fraction are also unsuitable for 3D cryo-electron-microscopy. Ultra short coherent X-ray pulses from X-ray free-electron lasers (XFELs) offer the potential for imaging nanocrystals as well as non-crystalline biological (and other)materials. The presentation will describe the most important advances in light of the development of X-ray sources.
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 Speaker: Ganapati Myneni - ISOHIM/University of Virginia/JLAb
Date: 2011-10-11
Time: 16:00
Place: ESS Lecture Hall, Stora Algatan 4, Lund
Abstract: Continuous wave superconducting radio frequency (SRF) accelerator systems are needed not only in discovery science programs through out the world but they are also expected to find applications in a wide variety of programs including advanced reactor cycles using thorium as nuclear fuel, commercial and university compact linacs and FEL’s.
However, these state of the art particle accelerator systems are very expensive to build and consume significant power in their operations. In the present world economic, energy sustainability and global warming concerns, we must improve the efficiency of the CW SRF accelerator systems considerably and in a cost effective manner. In this presentation I will review the current status of the CW SRF systems including the recent advances in improving the quality factor of the SRF cavities at very much reduced costs. |
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 Speaker: Jean-Michel Lagniel - GANIL, Le Grand Accélérateur National d’Ions Lourds
Date: 2011-10-02
Time: 16:00
Place: ESS Lecture Hall, Stora Algatan 4, Lund
Abstract: The presentation will cover the organization and the successive steps which have been necessary for the definition, design, then construction of the SPIRAL 2 buildings and infrastructures. The status of the building construction will be presented and, by way of conclusion, 3 advices will be discussed with the objective to share a part of the SPIRAL 2 experience with the ESS Team. |
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 Speaker: Prof. J. Paul Attfield, Centre for Science at Extreme Conditions and School of Chemistry, University of Edingburgh, United Kingdom
Date: 2011-10-13
Time: 14:15
Place: Chemistry Center, Lecture Hall B, Lund, Sweden.
Click here to download the poster
Electronic metal oxides often adopt simple inorganic structure types such as perovskite, but with subtle superstructures that result from coupling of spin, orbital and charge degrees of freedom. Further, far-from-equilibrium, materials are available by quenching from high pressure and temperature conditions. Recent results for the high pressure phases MnVO3, and BiNiO3 which shows a remarkable intermetallic valence transition leading to colossal negative thermal expansion at ambient conditions, will be presented.
Substitution of oxide by nitride enables oxynitride perovskites of high valent transition metals to be stabilised, and colossal magnetoresistances (CMR) at low temperatures have been discovered in EuNbO2N and EuWON2. The anion ordering principles, deduced from neutron diffraction, and predicted local structures for AMO3-xNx perovskites will be discussed.
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