13,330 research outputs found
On Homogeneous Decomposition Spaces and Associated Decompositions of Distribution Spaces
A new construction of decomposition smoothness spaces of homogeneous type is
considered. The smoothness spaces are based on structured and flexible
decompositions of the frequency space . We
construct simple adapted tight frames for that can be used
to fully characterise the smoothness norm in terms of a sparseness condition
imposed on the frame coefficients. Moreover, it is proved that the frames
provide a universal decomposition of tempered distributions with convergence in
the tempered distributions modulo polynomials. As an application of the general
theory, the notion of homogeneous -modulation spaces is introduced.Comment: 27 page
On a discrete transform of homogeneous decomposition spaces
We introduce almost diagonal matrices in the setting of (anisotropic)
discrete homogeneous Triebel-Lizorkin type spaces and homogeneous modulation
spaces, and it is shown that the class of almost diagonal matrices is closed
under matrix multiplication.
We then connect the results to the continuous setting and show that the
"change of frame" matrix for a pair of time-frequency frames, with suitable
decay properties, is almost diagonal. As an application of this result, we
consider a construction of compactly supported frame expansions for homogeneous
decomposition spaces of Triebel-Lizorkin type and for the associated modulation
spaces.Comment: 30 page
2012 Australian Census of Women in Leadership
A research book commissioned by the Australian Government Equal Opportunity Agency. This work reports the results of the 2012 Australian Census of Women in Leadership. The survey includes an analysis of the ASX 500 companies boards and executives gender diversity; gender diversity in public sector boards; and comparison with international initiatives in gender diversity in leadership positions. The work provides a detailed analysis of a large data base, and analytical commentary of the results. There is an assessment of remaining obstacles to achieving greater diversity, and analysis of what is required to create a better pipeline for the development of women for leadership
Loss-of-function genomic variants highlight potential therapeutic targets for cardiovascular disease
An efficient quantum circuit analyser on qubits and qudits
This paper presents a highly efficient decomposition scheme and its
associated Mathematica notebook for the analysis of complicated quantum
circuits comprised of single/multiple qubit and qudit quantum gates. In
particular, this scheme reduces the evaluation of multiple unitary gate
operations with many conditionals to just two matrix additions, regardless of
the number of conditionals or gate dimensions. This improves significantly the
capability of a quantum circuit analyser implemented in a classical computer.
This is also the first efficient quantum circuit analyser to include qudit
quantum logic gates
Hyperfine interaction induced decoherence of electron spins in quantum dots
We investigate in detail, using both analytical and numerical tools, the
decoherence of electron spins in quantum dots (QDs) coupled to a bath of
nuclear spins in magnetic fields or with various initial bath polarizations,
focusing on the longitudinal relaxation in low and moderate field/polarization
regimes. An increase of the initial polarization of nuclear spin bath has the
same effect on the decoherence process as an increase of the external magnetic
field, namely, the decoherence dynamics changes from smooth decay to damped
oscillations. This change can be observed experimentally for a single QD and
for a double-QD setup. Our results indicate that substantial increase of the
decoherence time requires very large bath polarizations, and the use of other
methods (dynamical decoupling or control of the nuclear spins distribution) may
be more practical for suppressing decoherence of QD-based qubits.Comment: Rev. Tex, 5 pages, 3 eps color figures, submitted to Phys. Rev.
Fungi, feather damage, and risk of predation
International audiencePredation is a powerful selective force with important effects on behavior, morphology , life history, and evolution of prey. Parasites may change body condition, health status, and ability to escape from or defend prey against predators. Once a prey individual has been detected, it can rely on a diversity of means of escape from the pursuit by the predator. Here we tested whether prey of a common raptor differed in terms of fungi from nonprey recorded at the same sites using the goshawk Accipiter gentilis and its avian prey as a model system. We found a positive association between the probability of falling prey to the raptor and the presence and the abundance of fungi. Birds with a specific composition of the community of fungi had higher probability of falling prey to a goshawk than individual hosts with fewer fungi. These findings imply that fungi may play a significant role in predator-prey interactions. The probability of having damaged feathers increased with the number of fungal colonies, and in particular the abundance of Myceliophthora verrucos and Schizophyllum sp. was positively related to the probability of having damaged feathers. In addition, we found a significant correlation between the rate of feather growth of goshawk prey with birds with more fungi being more likely to be depredated. These findings are consistent with the hypothesis that survival and feather quality of birds are related to abundance and diversity of fungi
Transverse Momentum Spectra in Au+Au and d+Au Collisions at =200 GeV and the Pseudorapidity Dependence of High p Suppression
We present spectra of charged hadrons from Au+Au and d+Au collisions at
GeV measured with the BRAHMS experiment at RHIC. The
spectra for different collision centralities are compared to spectra from collisions at the same energy scaled by the number of binary
collisions. The resulting ratios (nuclear modification factors) for central
Au+Au collisions at and evidence a strong suppression in
the high region (2 GeV/c). In contrast, the d+Au nuclear
modification factor (at ) exhibits an enhancement of the high
yields. These measurements indicate a high energy loss of the high
particles in the medium created in the central Au+Au collisions. The lack of
suppression in d+Au collisions makes it unlikely that initial state effects can
explain the suppression in the central Au+Au collisions.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let
Rapidity Dependence of Charged Antiparticle-to-Particle Ratios in Au+Au Collisions at GeV
We present ratios of the numbers of charged antiparticles to particles
(pions, kaons and protons) in Au + Au collisions at GeV as
a function of rapidity in the range =0-3. While the particle ratios at
midrapidity are approaching unity, the and ratios
decrease significantly at forward rapidities. An interpretation of the results
within the statistical model indicates a reduction of the baryon chemical
potential from MeV at =3 to MeV at
=0.Comment: 4 pages, 4 figure
- …