1,797 research outputs found
Digital Measurement of Differential Time Delay of Pseudo Random Coded Signals Scientific Report No. 6
Digital measurement of differential time delay of pseudorandom coded signal
On the time required for group multiplication
Group multiplication of logical elements by networks having limited inputs and unit delay in computing output functio
A Class of Codes for Multiple-access Satellite Communication Systems
Codes for multiple-access communication satellite systems using time-frequency multiplexin
Formulas vs. Circuits for Small Distance Connectivity
We give the first super-polynomial separation in the power of bounded-depth
boolean formulas vs. circuits. Specifically, we consider the problem Distance
Connectivity, which asks whether two specified nodes in a graph of size
are connected by a path of length at most . This problem is solvable
(by the recursive doubling technique) on {\bf circuits} of depth
and size . In contrast, we show that solving this problem on {\bf
formulas} of depth requires size for all . As corollaries:
(i) It follows that polynomial-size circuits for Distance Connectivity
require depth for all . This matches the
upper bound from recursive doubling and improves a previous lower bound of Beame, Pitassi and Impagliazzo [BIP98].
(ii) We get a tight lower bound of on the size required to
simulate size- depth- circuits by depth- formulas for all and . No lower bound better than
was previously known for any .
Our proof technique is centered on a new notion of pathset complexity, which
roughly speaking measures the minimum cost of constructing a set of (partial)
paths in a universe of size via the operations of union and relational
join, subject to certain density constraints. Half of our proof shows that
bounded-depth formulas solving Distance Connectivity imply upper bounds
on pathset complexity. The other half is a combinatorial lower bound on pathset
complexity
A Note on W Production at HERA
We discuss W boson production at HERA including NLO QCD corrections.Comment: 2 pages, latex, 2 figures, Contribution to the 3rd UK Phenomenology
Workshop on HERA Physics, Durham, 20-25 Sep. 199
Operant conditioning in older adults with Alzheimer\u27s disease
Behavioral interventions are commonly implemented to manage agitation in older adults with dementia. However, the extent to which operant conditioning can occur in this population is unclear. The present study used a button-pressing task to evaluate the sensitivity of the responding of individuals with probable Alzheimer\u27s disease to changes in schedules of reinforcement. Results indicate that operant conditioning can occur in older adults with AD. Specifically, three participants with AD exhibited responding that was highly sensitive to a transition from a fixed interval schedule to an extinction schedule. One participant\u27s responding was sensitive to a more subtle transition. Comparison data is presented from older controls and college students. Clinical implications of findings and suggestions for future research are presented
Squark and Gluino Production at Hadron Colliders
We have determined the theoretical predictions for the cross-sections of
squark and gluino production at \ppb and colliders (Tevatron and LHC) in
next-to-leading order of supersymmetric QCD. By reducing the dependence on the
renormalization/factorization scale considerably, the theoretically predicted
values for the cross-sections are much more stable if these higher-order
corrections are implemented. If squarks and gluinos are discovered, this
improved stability translates into a reduced error on the masses, as extracted
experimentally from the size of the production cross-sections. The
cross-sections increase significantly if the next-to-leading order corrections
are included at a renormalization/factorization scale near the average mass of
the produced massive particles. This rise results in improved lower bounds on
squark and gluino masses. By contrast, the shape of the transverse-momentum and
rapidity distributions remains nearly unchanged when the next-to-leading order
corrections are included.Comment: 60 pages, Latex2e, 24 figures (uses epsfig.sty
Higgs radiation off quarks in supersymmetric theories at e^+e^- colliders
Yukawa couplings between Higgs bosons and quarks in supersymmetric theories
can be measured in the processes e^+e^- -> Q Qbar + Higgs. We have determined
the cross sections of these processes in the minimal supersymmetric model
including the complete set of next-to-leading order QCD corrections for all
channels.Comment: 12 pages, latex, 3 figure
Differential Pollen‐Tube Growth Rates And Nonrandom Fertilization In Hibiscus Moscheutos (Malvaceae)
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141504/1/ajb212608.pd
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