27,875 research outputs found
The Lutheran Student Movement in Canada: a brief history and analysis
The essay is a revision of a paper originally prepared for a joint consultation between the LSMC, the Student Christian Movement and Yanik (a student group in Quebec) held in Montreal in February, 1977. Written shortly after the death of Donald H Voigts, former executive secretary of the Divisions of Educational Service and Campus Foundation Activity of the Lutheran Council in Canada, it was compiled with a view to beginning a process of reflection upon the historical development of the LSMC and of campus ministry in Canada
Phase Diagrams of Three-Component Attractive Ultracold Fermions in One-Dimension
We investigate trions, paired states and quantum phase transitions in
one-dimensional SU(3) attractive fermions in external fields by means of the
Bethe ansatz and the dressed energy formalism. Analytical results for the
ground state energy, critical fields and complete phase diagrams are presented
for weak and strong regimes. Numerical solutions of the dressed energy
equations allow us to examine how the different phase boundaries modify by
varying the inter-component coupling throughout the whole attractive regimes.
The pure trionic phase reduces smoothly by decreasing this coupling until the
weak limit is reached. In this weak regime, a pure BCS-paired phase can be
sustained under certain nonlinear Zeeman splittings. Finally we confirm that
the analytic expressions for the physical quantities and resulting phase
diagrams are highly accurate in the weak and strong coupling regimes.Comment: 12 pages, 3 figures, revised version, accepted in New J. Phy
Study of fragmentation and momentum correlations in heavy-ion collisions
The role of momentum correlations is studied in the production of light and
medium mass fragments by imposing momentum cut in clusterization the phase
space. Our detailed investigation shows that momentum cut has major role to
play in the emission of fragments.Comment: 16 pages, 7 figure
Memory texts and memory work: Performances of memory in and with visual media
The online version of this article can be found at: http://mss.sagepub.com/content/early/2010/05/24/175069801037003
An airborne FLIR detection and warning system for low altitude wind shear
It is shown through some preliminary flight measurement research that a forward looking infrared radiometer (FLIR) system can be used to successfully detect the cool downdraft of downbursts (microbusts/macrobursts) and thunderstorm gust front outflows that are responsible for most of the low altitude wind shear (LAWS) events. The FLIR system provides a much greater safety margin for the pilot than that provided by reactive designs such as inertial air speed systems. Preliminary results indicate that an advanced airborne FLIR system could provide the pilot with remote indication of microburst (MB) hazards along the flight path ahead of the aircraft. Results of a flight test of a prototype FLIR system show that a minimum warning time of one to four minutes (5 to 10 km), depending on aircraft speed, is available to the pilot prior to the microburst encounter
Rod-like Polyelectrolytes in Presence of Monovalent Salt
We investigate the properties of rigid polyelectrolyte solutions in presence
of monovalent salt. The free energy within the Debye-H\"uckel-Bjerrum (DHBj)
theory [M. E.
Fisher and Y. Levin, {\it Phys. Rev. Lett.} 71, 3826 (1993)] is constructed.
It is found that at thermodynamic equilibrium the polyelectrolyte solution
consists of clusters composed of one polyion and various counterions. The
distribution of the cluster densities is determined by finding the minimum of
the Helmholtz free energy. The osmotic pressure and the average charge of the
cluster are found and their dependence on Manning parameter is
elucidated. A good agreement with the experimental results is obtained.Comment: 11 pages, Revtex (using twocolumn style), 15 figures and postscript
file. Submitted to Macromomelecule
- …