R: Trieste Scientific news Digest
ARMENIO at dica.units.it
ARMENIO at dica.units.it
Mon Jun 30 08:31:37 CEST 2008
seminar on Fluid MEchanics (ARMENIO at dica.units.it)
Friday July 4, 14.30 Seminar Room C, Leonardo da Vinci Building, (MB) ICTP
The turbulent oscillating channel flow subjected to a wind stress
Dr. Werner Kramer
Fluid Dynamics Laboratory,
Department of Applied Physics
Eindhoven University of Technology
Oscillating flows are of importance to many industrial and geophysical applications. For instance, the tides drive an inflow (high tide) and outflow (low tide) in estuary regions. Strong wind conditions are also typical for these regions. We aim to study by Large Eddy Simulations the simplified problem of an oscillating channel flow subjected to a wind stress at the free surface. Depending of the phase of the tide strong shear layers develop at the bottom and free surface. In these layers turbulence is hence strongly enhanced. Subsequently, the turbulence fills the entire vertical fluid column. In this studies we investigate the turbulent properties of the flow and pay attention the boundary layers and turbulent structure in this region. This research is part of a Research Project jointly carried out by the group of Prof. H.J.H. Clercx (Dept. Applied Physics, TUE) and the group of Prof. V. Armenio, (Dept. Civil and Environmental Engineering, UT) aimed at the study of dispers ion of microorganisms in water basins.
Vincenzo Armenio, Ph.D
Associate Professor of Environmental Hydraulics http://www.dica.units.it/perspage/armenio/IEfluids.html#fluids
Director of the School of Doctorate in
Environmental and Industrial Fluid Mechanics http://poseidon.ogs.trieste.it/phd/fluid/
Dipartimento di Ingegneria Civile ed Ambientale, Universit? di Trieste, Piazzale Europa 1,
34127 Trieste, Italy
tel +39-040-558 3472
fax +39-040-572082
mobile +39-334-6798544
Vincenzo Armenio, Ph.D
Associate Professor of Environmental Hydraulics
http://www.dica.units.it/perspage/armenio/IEfluids.html#fluids
Director of the School of Doctorate in
Environmental and Industrial Fluid Mechanics
http://poseidon.ogs.trieste.it/phd/fluid/
Dipartimento di Ingegneria Civile ed Ambientale,
Università di Trieste,
Piazzale Europa 1,
34127 Trieste, Italy
tel +39-040-558 3472
fax +39-040-572082
mobile +39-334-6798544
-----Messaggio originale-----
Da: science-ts-bounces at lists.ictp.it [mailto:science-ts-bounces at lists.ictp.it] Per conto di science-ts-request at lists.ictp.it
Inviato: venerdì 27 giugno 2008 12.00
A: science-ts at lists.ictp.it
Oggetto: Trieste Scientific news Digest
Content:
1. seminar on Fluid MEchanics (ARMENIO at dica.units.it)
2. Mathematics Seminar - Wednesday 2 July (Mabilo Koutou)
3. CBM seminar: Monday, 7 July 2008, 11 AM (Maria Teresa Turello)
----------------------------------------------------------------------
From: <ARMENIO at dica.units.it>
Subject: seminar on Fluid MEchanics
Seminar on Fluid Mechanics
The turbulent oscillating channel flow subjected to a wind stress
Dr. Werner Kramer
Fluid Dynamics Laboratory,
Department of Applied Physics
Eindhoven University of Technology
Oscillating flows are of importance to many industrial and geophysical applications. For instance, the tides drive an inflow (high tide) and outflow (low tide) in estuary regions. Strong wind conditions are also typical for these regions. We aim to study by Large Eddy Simulations the simplified problem of an oscillating channel flow subjected to a wind stress at the free surface. Depending of the phase of the tide strong shear layers develop at the bottom and free surface. In these layers turbulence is hence strongly enhanced. Subsequently, the turbulence fills the entire vertical fluid column. In this studies we investigate the turbulent properties of the flow and pay attention the boundary layers and turbulent structure in this region. This research is part of a Research Project jointly carried out by the group of Prof. H.J.H. Clercx (Dept. Applied Physics, TUE) and the group of Prof. V. Armenio, (Dept. Civil and Environmental Engineering, UT) aimed at the study of dispers
ion of microorganisms in water basins.
Vincenzo Armenio, Ph.D
Associate Professor of Environmental Hydraulics
http://www.dica.units.it/perspage/armenio/IEfluids.html#fluids
Director of the School of Doctorate in
Environmental and Industrial Fluid Mechanics
http://poseidon.ogs.trieste.it/phd/fluid/
Dipartimento di Ingegneria Civile ed Ambientale,
Universit? di Trieste,
Piazzale Europa 1,
34127 Trieste, Italy
tel +39-040-558 3472
fax +39-040-572082
mobile +39-334-6798544
------------------------------
From: Mabilo Koutou <mabilok at ictp.it>
Subject: Mathematics Seminar - Wednesday 2 July
M A T H E M A T I C S S E M I N A R S 2008
Wednesday, 2 July at 14.30 hrs.
Professor Shreeram S. Abhyankar
(Perdue University, West Lafayette, USA)
"On the Jacobian Problem"
Venue: SEMINAR ROOM
(ICTP Leonardo Building, first floor)
------------------------------
From: Maria Teresa Turello <mariateresa.turello at cbm.fvg.it>
Subject: CBM seminar: Monday, 7 July 2008, 11 AM
Dear All,
You are kindly invited to the next CBM seminar:
Imaging and force spectroscopy by AFM on DNA
Dr. Giovanni Di Santo
Laboratoire de Physique de la Mati?re Vivante, Ecole Polytechnique F?d?rale de Lausanne (EPFL), CH-1015 Lausanne ? Switzerland
giovanni.disanto at epfl.ch
Moderator: Dr. Stefano Prato, APE Research srl
?
Monday, 7 July 2008, 11 AM
Meeting Room CBM, Q building, 1st floor
AREA Science Park, Basovizza (TS)
ABSTRACT
Atomic force microscopy (AFM) is a powerful tool for determining the topography of native biomolecules at subnanometer resolution. A custom made AFM conceived for vacuum and low temperatures (77 K) experiments has been developed in order to increase the resolution on soft samples. Starting from a first prototype working in contact mode, we implemented dynamic modes (tapping, non-contact) on the aim to reduce possible sample damaging due to strong tip-sample interactions. Technical solutions to improve the functionality of the microscope will be described.
Non Contact mode provides high signal stability and the needed sensitivity to visualize DNA details on the single molecule scale. In this mode of operation, also known as Frequency Modulation AFM, Frequency shift ( D f) versus separation (Z) curves lead to a detailed comprehension of the tip-sample interaction providing quantitative measurements of both force and interaction potential. We present D f vs Z curves taken on DNA molecules deposited on mica substrates. The high resolution force measurements on soft specimens like APTES functionalized mica has returned adhesion forces less than 1 nN. The experimental conditions permit to evaluate the net interaction between the sample and a sharp tip. The single point spectroscopy measurements indicate that FM-AFM can easily detect differences in interaction forces between sample and substrate opening the possibility to evaluate local interaction at the molecular scale.
For information: info at cbm.fvg.it
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------------------------------
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