67,018 research outputs found
Winding angles for two-dimensional polymers with orientation dependent interactions
We study winding angles of oriented polymers with orientation-dependent
interaction in two dimensions. Using exact analytical calculations, computer
simulations, and phenomenological arguments, we succeed in finding the variance
of the winding angle for most of the phase diagram. Our results suggest that
the winding angle distribution is a universal quantity, and that the
--point is the point where the three phase boundaries between the
swollen, the normal collapsed, and the spiral collapsed phase meet. The
transition between the normal collapsed phase and the spiral phase is shown to
be continuous.Comment: 21 pages (incl 5 figures
Smoothening Transition of a Two-Dimensional Pressurized Polymer Ring
We revisit the problem of a two-dimensional polymer ring subject to an
inflating pressure differential. The ring is modeled as a freely jointed closed
chain of N monomers. Using a Flory argument, mean-field calculation and Monte
Carlo simulations, we show that at a critical pressure, , the
ring undergoes a second-order phase transition from a crumpled, random-walk
state, where its mean area scales as , to a smooth state with
. The transition belongs to the mean-field universality class. At
the critical point a new state of polymer statistics is found, in which
. For we use a transfer-matrix calculation to derive
exact expressions for the properties of the smooth state.Comment: 9 pages, 8 figure
Communication system for a tooth-mounted RF sensor used for continuous monitoring of nutrient intake
In this Thesis, the communication system of a wearable device that monitors the user’s diet is studied. Based in a novel RF metamaterial-based mouth sensor, different decisions have to be made concerning the system’s technologies, such as the power source options for the device, the wireless technology used for communications and the method to obtain data from the sensor. These issues, along with other safety rules and regulations, are reviewed, as the first stage of development of the Food-Intake Monitoring projectOutgoin
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