181,141 research outputs found
Binary to binary coded decimal converter
A binary coded input signal is converted to a binary coded decimal signal having N decades by employing N four bit shift registers. The bits of the input signal are sequentially supplied, in order, to the least significant position of the register for the units decade, with the most significant bit of the input signal being applied to the units register first. Each of the registers includes a right shift-parallel load mode control input terminal. In response to the sum of the values stored in each register and the binary value 0011 being less than the binary value 1000, the mode control input terminal is activated to shift the register contents one bit to the right. In response to the sum being greater than 1000, the mode control input terminal is activated to load the sum into the register
Linear Collider Physics
The International Linear Collider has a rich physics programme, whatever lies
beyond the standard model. Accurate measurement of the top quark mass is needed
to constrain the model or its extensions. If there is a light Higgs boson the
LHC should see it, but the ILC will pin down its characteristics and test them
against model predictions. If Supersymmetric particles appear the ILC will
measure a complementary set of them to those seen at the LHC, and may allow
extrapolation to the Grand Unified scale. And if a strong electroweak sector is
indicated the ILC will be sensitive to the presence of new structures in
difermion and diboson systems up to higher masses than the direct search range
of the LHC. Beyond the LHC and ILC there could be need for a multi TeV lepton
collider.Comment: Plenary talk at ICHEP 2004, Beijing, 22 August 200
Long-term energy capture and the effects of optimizing wind turbine operating strategies
Methods of increasing energy capture without affecting the turbine design were investigated. The emphasis was on optimizing the wind turbine operating strategy. The operating strategy embodies the startup and shutdown algorithm as well as the algorithm for determining when to yaw (rotate) the axis of the turbine more directly into the wind. Using data collected at a number of sites, the time-dependent simulation of a MOD-2 wind turbine using various, site-dependent operating strategies provided evidence that site-specific fine tuning can produce significant increases in long-term energy capture as well as reduce the number of start-stop cycles and yawing maneuvers, which may result in reduced fatigue and subsequent maintenance
Electromagnetic Form Factors and Charge Densities From Hadrons to Nuclei
A simple exact covariant model in which a scalar particle is modeled as a
bound state of two different particles is used to elucidate relativistic
aspects of electromagnetic form factors. The model form factor is computed
using an exact covariant calculation of the lowest-order triangle diagram and
shown to be the same as that obtained using light-front techniques. The meaning
of transverse density is explained using coordinate space variables, allowing
us to identify a true mean-square transverse size directly related to the form
factor. We show that the rest-frame charge distribution is generally not
observable because of the failure to uphold current conservation. Neutral
systems of two charged constituents are shown to obey the lore that the heavier
one is generally closer to the transverse origin than the lighter one. It is
argued that the negative central charge density of the neutron arises, in
pion-cloud models, from pions of high longitudinal momentum. The
non-relativistic limit is defined precisely and the ratio of the binding energy
to that of the mass of the lightest constituent is shown to govern the
influence of relativistic effects. The exact relativistic formula for the form
factor reduces to the familiar one of the three-dimensional Fourier transform
of a square of a wave function for a very limited range of parameters. For
masses that mimic the quark-di-quark model of the nucleon we find substantial
relativistic corrections for any value of . A schematic model of the
lowest s-states of nuclei is used to find that relativistic effects decrease
the form factor for light nuclei but increase the form factor for heavy nuclei.
Furthermore, these states are strongly influenced by relativity.Comment: 18 pages, 11 figure
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