April 2011 - Vip-all.phys - maillist.au.dk

[vip-all] Seeds, help please
by Trine B.Mortensen 12 Apr '11

12 Apr '11

Dear Colleagues, Sydney Leach in Paris has been performing experiments on seed irradiation on the Space Station. The arabidopsis and tobacco seeds that have returned from space have been solar and cosmic irradiated. Since they were dry, or at any rate dry enough to avoid germination in space, there must have been created quite a few free radicals during their exposition. Being imbibed with water after return to Earth should liberate free radical reactions that can affect germination. We can look at changes in DNA at that point but would like to know something about the number and possibly the nature of the free radicals in the seeds returned to Earth but before being imbibed with water. This could be done by electron paramagnetic resonance measurements. Is there anyone in IFA (or perhaps in Chemistry) that might be interested enough in this and able to do some epr measurements on the irradiated seeds, please? If so get in touch with me and with Sydney ( <mailto:sydney.leach@obspm.fr> sydney.leach(a)obspm.fr) Mvh David (Field)

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[vip-all] AMO seminar today, 15:15
by Aurélien Dantan 07 Apr '11

07 Apr '11

Title: Quantum control by parallel adiabatic passage: From quantum information processing to laser-driven quantum machines Speaker: Stephane Guérin Laboratoire Interdisciplinaire Carnot de Bourgogne Université de Bourgogne, Dijon, France Time: Thursday, April 7, 15.15 to 16.00 Place: Fysisk Auditorium Abstract: We present the technique of fast parallel adiabatic passage and its application to the control of quantum processes such as state-selectivity, to quantum information processing, and to the manipulation of the rotation of molecules to implement quantum machines, such as a quantum gear. This technique corresponds to an adiabatic passage for which the instantaneous eigenvalues are parallel at each time. It induces a very efficient population transfer in terms of pulse energy and duration, while preserving the standard robustness of adiabatic techniques. It can be implemented in optics with the modern technology of liquid crystal spatial light modulators. This opens the possibility to implement a Stimulated Raman adiabatic passage technique in a sub-picosecond regime. D. Daems and S. Guérin, Adiabatic quantum search scheme with atoms in a cavity driven by lasers, Phys. Rev. Lett. 99, 170503 (2007). G. Dridi S. Guérin, V. Hakobyan, H.R. Jauslin, and H. Eleuch, Ultrafast stimulated Raman parallel adiabatic passage by shaped pulses, Phys. Rev. A 80, 043408 (2009). M. Lapert, S. Guérin, and D. Sugny, Field-free quantum cogwheel by shaping of rotational wave packets, Phys. Rev. A 83, 013403 (2011). Jacob Sherson and Aurélien Dantan Coffee, tea and cake will be served at 15.05 ----------------------------------- Aurelien Dantan Ion Trap Group Department of Physics and Astronomy University of Aarhus Ny Munkegade, bygn. 1520 8000 Aarhus Denmark +4589423602

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[vip-all] General Physics Colloquium today at 3 p.m.
by Trine B.Mortensen 06 Apr '11

06 Apr '11

GENERAL PHYSICS COLLOQUIUM _____ Title: Universally slow: The physics of aging Speaker: Ariel Amir, Weizmann Institute of Science, Israel Time: Wednesday, 6 April, 2011 at 3:15 p.m. Place: Physics Auditorium, 3rd floor, Department of Physics Abstract Glassy systems are ubiquitous in nature, from window glasses, with enormous viscosities making their flow extremely slow, through the anomalous magnetic properties of spin-glasses, to memory effects observed in granular media. Among their key properties are slow relaxations to equilibrium without a typical timescale and aging, the dependence of relaxation on the system's age. Understanding these phenomena is a long-standing problem in physics. We study the aging of the electron glass, a system showing remarkable slow relaxations of the conductance. We find that the broad distribution of relaxation rates leads to a universal relaxation form log(1+ tw/t) for a common aging protocol, where tw is the length of time the perturbation driving the system out-of-equilibrium was on, and t the time of measurement. This universal formula has been found to describe systems ranging from electron glasses, through disordered semiconductors and structural glasses. _____ Coffee/tea and cake will be served at 3 p.m. David Field ******************************* Trine Binderup Department of Physics and Astronomy Aarhus University Ny Munkegade 120, building 1525 DK-8000 Aarhus C e-mail: trinebm(a)phys.au.dk Phone: +45 8942 3603 Office: 1525-324

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[vip-all] Ferietjek - Holiday check
by Brigitte Henderson 05 Apr '11

05 Apr '11

Kære alle Ferieåret 2010/2011 nærmer sig sin afslutning. Derfor vil jeg bede jer tjekke jeres ferieregistrering for perioden 1.1.2011-30.4.2011. Vil I sikre jer, at registreringerne er i overensstemmelse med afholdt ferie? Se her hvordan det gøres: http://phys.au.dk/fileadmin/site_files/intern/dk/Se_din_feriesaldo.pdf ------------------------------------------------------------------------- Dear All, The holiday year 2010/2011 is coming to an end. Please make sure that we have registered your holiday correctly in the period 1.1.2011-30.4.2011. How to check your holiday: http://phys.au.dk/fileadmin/site_files/intern/eng/Holiday_check.pdf Med venlig hilsen / Kind regards ****************** Brigitte Henderson Department of Physics and Astronomy Ny Munkegade, Bldg. 1520 DK-8000 Aarhus C Denmark e-mail: <mailto:brigitte@phys.au.dk> brigitte(a)phys.au.dk Tel: +45 8942 4826 Mobile:+45 2338 2389 Fax: +45 8612 0740 ****************** Brigitte Henderson Department of Physics and Astronomy Ny Munkegade, Bldg. 1520 DK-8000 Aarhus C Denmark e-mail: <mailto:brigitte@phys.au.dk> brigitte(a)phys.au.dk Tel: +45 8942 4826 Mobile:+45 2338 2389 Fax: +45 8612 0740 Office:1522-312

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[vip-all] Projekter i "Bølger og Optik" forår 2011
by Peter Balling 01 Apr '11

01 Apr '11

Kære kollega (på det nye store IFA). (English summary below) Førsteårskurset "Bølger og optik" afsluttes med et to-ugers projektforløb (i uge 20 og 21). I disse to uger aflyses al fysikundervisning, således at de studerende har 1/3 af deres tid til rådighed til at gennemføre et teoretisk eller eksperimentelt projekt og skrive en rapport og et resume', som indgår ved den mundtlige eksamen. Projekterne skal i bred forstand falde indenfor emnet "Bølger og optik", og de udbydes af JER. Der er instruktorer til rådighed til at assistere de studerende med den praktiske gennemførsel af projekter, hvis det er aktuelt. For at give dig en ide' om, hvad et sådant projekt kan indebære, vedlægger jeg sidste års projektkatalog. Jeg håber, at du har lyst til at bidrage til denne væsentlige og motiverende del af kurset, og ser frem til at høre fra dig i løbet af den næste uge. Glem ikke, at dette er det perfekte udstillingsvindue, hvor du viser de kommende bachelor, speciale og ph.d.-studerende, hvad der foregår i din gruppe! Bemærk, at vi i år har den største årgang af studerende i mands minde på over 100 fysikstuderende, så tag lige og tænk over, om ikke du skulle byde ind! Svar gerne senest 10/4, tak. MVH Peter *** English summary: Dear Colleague. Please consider to offer hosting a smaller group of first-year students to undertake a small theoretical or experimental project in your research group. The topic should be within "Waves and optics" in a general sense. The period in question is calendar weeks 20 and 21, and the total effort you may expect from the students is 1/3 of their time, i.e. something like 30 hours total, including the writing of a report. The enclosed note (in Danish) shows a list of topics for last year's round; this year there are 35% more students, and we thus need many new projects, so please reply - preferably before April 10th, thanks. If you are in doubt about what this amounts to from your side, please come by or send me an e-mail. Sincerely Peter -- Peter Balling Tel direct: (+45) 8942 3626 Department of Physics and Astronomy Tel institute: (+45) 8942 1111 Aarhus University Fax: (+45) 8612 0740 Ny Munkegade 120 DK-8000 Aarhus C. e-mail: balling(a)phys.au.dk Denmark

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