4,581 research outputs found
Ultraviolet instrumentation for orbital remote sensors
Ultraviolet instrumentation for orbital remote sensor
Energy Efficiency in Multi-hop CDMA Networks: A Game Theoretic Analysis
A game-theoretic analysis is used to study the effects of receiver choice on
the energy efficiency of multi-hop networks in which the nodes communicate
using Direct-Sequence Code Division Multiple Access (DS-CDMA). A Nash
equilibrium of the game in which the network nodes can choose their receivers
as well as their transmit powers to maximize the total number of bits they
transmit per unit of energy is derived. The energy efficiencies resulting from
the use of different linear multiuser receivers in this context are compared,
looking at both the non-cooperative game and the Pareto optimal solution. For
analytical ease, particular attention is paid to asymptotically large networks.
Significant gains in energy efficiency are observed when multiuser receivers,
particularly the linear minimum mean-square error (MMSE) receiver, are used
instead of conventional matched filter receivers.Comment: To appear in the Proceedings of the Workshop on Multi-Layer Modelling
and Design of Multi-Hop Wireless Networks (MLMD 06), Minneapolis, MN, July 12
- 15, 200
From kinetic theory to dissipative fluid dynamics
We present the results of deriving the Israel-Stewart equations of
relativistic dissipative fluid dynamics from kinetic theory via Grad's
14-moment expansion. Working consistently to second order in the Knudsen
number, these equations contain several new terms which are absent in previous
treatments.Comment: 7 pages, proceedings of the Erice School on Nuclear Physics "Heavy
Ion collisions from the Coulomb Barrier up to the Quark Gluon Plasma", Erice,
Sicily, Sep. 16 - 24, 200
Performance Analysis of Iterative Channel Estimation and Multiuser Detection in Multipath DS-CDMA Channels
This paper examines the performance of decision feedback based iterative
channel estimation and multiuser detection in channel coded aperiodic DS-CDMA
systems operating over multipath fading channels. First, explicit expressions
describing the performance of channel estimation and parallel interference
cancellation based multiuser detection are developed. These results are then
combined to characterize the evolution of the performance of a system that
iterates among channel estimation, multiuser detection and channel decoding.
Sufficient conditions for convergence of this system to a unique fixed point
are developed.Comment: To appear in the IEEE Transactions on Signal Processin
Electron capture to continuum in collisions of bare projectiles with Ne targets
Abstract. We have investigated the cusp resulting from electron capture to the continuum of 1.25-5 MeV m u- ' fully stripped hydrogen and oxygen as a function of the collision energy and the detector angular resolution B o. It is revealed that the characteristic cusp shape parameters depend strongly on the experimental resolution. Our experimental data are "pared with the second-order Born theory and the impulse approximation. Both theories mnhrm the 8, dependence of the shape parameters and gjve a reasonable descrip-lion of the cusp asymmetry. However, theory tends to overestimate the absolute cross sections, in particular in the case of oxygen. 1
Advanced evaluation of vacuum UV detector- spectroscopy systems for capsule reentry measurements
Vacuum ultraviolet detector evaluation - spectroscopy systems for capsule reentry measurement
ALERT: FARMERS NEED TO SIGN UP FOR ACRE!
Corn, soybean and wheat producers are facing serious financial challenges. And it is even worse for livestock producers, most of who are also crop producers and are therefore eligible for ACRE. Crops are behind in maturity, some areas of the state need rain, product prices have fallen substantially, and USDA Counter Cyclical payments do not start until 5.36 soybeans and $3.40 on wheat. Chances of prices that low are around 10-15%, but at that point ACRE payments would be much, much bigger. Many producers do not understand ACRE and the benefits available; most of the reasons given for not participating are invalid.Crop Production/Industries, Farm Management,
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