2,898 research outputs found
Thermally activated barrier crossing and stochastic resonance of a flexible polymer chain in a piecewise linear bistable potential
We study the stochastic resonance (SR) of a flexible polymer chain crossing
over a piecewise linear bistable potential. The dependence of signal to noise
ratio on noise intensity , coupling constant and polymer length
is studied via two state approximation. We find that the response of signal
to the background noise strength is significant at optimum values of ,
and which suggests novel means of manipulating proteins or
vesicles. Furthermore, the thermally activated barrier crossing rate
for the flexible polymer chain is studied. We find that the crossing rate
exhibits an optimal value at an optimal coupling constant ;
decreases with . As the chain length increases, the escape
rate for the center of mass monotonously decreases. On the other hand,
the crossing rate for the portion of polymer segment increases and
saturates to a constant rate as steps up.Comment: 16 pages, 9 figure
Energetics of a simple microscopic heat engine
We model a microscopic heat engine as a particle hopping on a one-dimensional
lattice in a periodic sawtooth potential, with or without load, assisted by the
thermal kicks it gets from alternately placed hot and cold thermal baths. We
find analytic expressions for current and rate of heat flow when the engine
operates at steady state. Three regions are identified where the model acts
either as a heat engine or as a refrigerator or as neither of the two. At
quasistatic limit both efficiency of the engine and coefficient of performance
of the refrigerator go to that for Carnot engine and Carnot refrigerator,
respectively. We investigate efficiency of the engine at two operating
conditions (at maximum power and at optimum value with respect to energy and
time) and compare them with those of the endoreversible and Carnot engines.Comment: 6 pages and 8 figure
Student’s classroom participation in English language teaching: The case of Gozamen General Secondary School in Grade 10-A
Student’s classroom participation in English language teaching: The case of Gozamen General Secondary School in Grade 10-A
Author / Authors : Atalay Mesfin Aneteneh
Page no. 204-217
Discipline : Education
Script/language : Roman/ English
Category : Research paper/Action research
Keywords: English, Teaching Elementary, Training, Action research
The green, blue and grey water footprint of farm animals and animal products. Volume 2: Appendices
Contents
Appendix I: Feed conversion efficiencies – in kg of feed (dry mass) per kg of output – per animal category and region
Appendix II: Estimated consumption of feed per animal category and world region (103 ton dry mass/yr)
Appendix III. Estimated consumption of feed per production system and world region (103 ton dry mass/yr)
Appendix IV. Drinking and service water footprint per animal
Appendix V. Water footprint of animals and animal products (m3/ton). Period 1996-200
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