76,945 research outputs found
Complementary code and digital filtering for detection of weak VHF radar signals from the mesoscale
The SOUSY-VHF-Radar operates at a frequency of 53.5 MHz in a valley in the Harz mountains, Germany, 90 km from Hanover. The radar controller, which is programmed by a 16-bit computer holds 1024 program steps in core and controls, via 8 channels, the whole radar system: in particular the master oscillator, the transmitter, the transmit-receive-switch, the receiver, the analog to digital converter, and the hardware adder. The high-sensitivity receiver has a dynamic range of 70 dB and a video bandwidth of 1 MHz. Phase coding schemes are applied, in particular for investigations at mesospheric heights, in order to carry out measurements with the maximum duty cycle and the maximum height resolution. The computer takes the data from the adder to store it in magnetic tape or disc. The radar controller is programmed by the computer using simple FORTRAN IV statements. After the program has been loaded and the computer has started the radar controller, it runs automatically, stopping at the program end. In case of errors or failures occurring during the radar operation, the radar controller is shut off caused either by a safety circuit or by a power failure circuit or by a parity check system
The mobile Sousy-Doppler radar: Technical design and first results
A mobile VHF Doppler system was developed. The electronic part is installed in a 20 ft container and tested using a special log periodic aerial to illuminate the 300 m dish. The system was extended by designing a mobile phased antenna array with finally 576 Yagi elements. The grouping of the single Yagis, the system of transmission lines, the phase shifters, the power splitters and the T/R switch are described. Results from the first two campaigns and a survey of future programs demonstrating the flexibility of this mobile system are summarized
Transient dynamics of a molecular quantum dot with a vibrational degree of freedom
We investigate the transient effects occurring in a molecular quantum dot
described by an Anderson-Holstein Hamiltonian which is instantly coupled to two
fermionic leads biased by a finite voltage. In the limit of weak
electron-phonon interaction, we use perturbation theory to determine the
time-dependence of the dot population and the average current. The limit of
strong coupling is accessed by means of a self-consistent time-dependent
mean-field approximation. These comple- mentary approaches allow us to
investigate the dynamics of the inelastic effects occurring when the applied
bias voltage exceeds the phonon frequency and the emergence of bistability.Comment: 7 pages, 4 figure
Asymmetry and the Neutron Skin in Heavy Nuclei
In heavy nuclei the spatial distribution of protons and neutrons is
different. At CERN SPS energies production of and differs for
, , and scattering. These two facts lead to an impact
parameter dependence of the to ratio in
collisions. A recent experiment at CERN seems to confirm qualitatively these
predictions. It may open a possibility for determination of neutron density
distribution in nuclei.Comment: 6 pages and 2 figures, a talk by A.Szczurek at the international
conference MESON2004, June 4-8, Cracow, Polan
VHF Radar Observations in the Stratosphere and Mesosphere During a Stratospheric Warming
The SOUSY-VHF-radar was used to carry out measurements during minor and a major stratospheric warming in February and March 1980, respectively. Echoes have been received from the stratosphere up to an altitude of about 30 km continuously during day and night, whereas echoes from the mesosphere were restricted to the daytime and occurred sporadically at different heights within the altitude range from 60 to 90 km. The three dimensional velocity vector was derived from Doppler measurements made in three different antenna beam directions with a height resolution of 1.5 km. In particular, the results obtained during disturbed conditions show the change of the zonal winds at mesospheric heights from westerly to easterly. A spectral analysis reveals a diurnal and a weaker semidiurnal tide of the zonal wind component
Disorder by disorder and flat bands in the kagome transverse field Ising model
We study the transverse field Ising model on a kagome and a triangular
lattice using high-order series expansions about the high-field limit. For the
triangular lattice our results confirm a second-order quantum phase transition
in the 3d XY universality class. Our findings for the kagome lattice indicate a
notable instance of a disorder by disorder scenario in two dimensions. The
latter follows from a combined analysis of the elementary gap in the high- and
low-field limit which is shown to stay finite for all fields h. Furthermore,
the lowest one-particle dispersion for the kagome lattice is extremely flat
acquiring a dispersion only from order eight in the 1/h limit. This behaviour
can be traced back to the existence of local modes and their breakdown which is
understood intuitively via the linked cluster expansion.Comment: 11 pages, 11 figrue
Bounds on universal quantum computation with perturbed 2d cluster states
Motivated by the possibility of universal quantum computation under noise
perturbations, we compute the phase diagram of the 2d cluster state Hamiltonian
in the presence of Ising terms and magnetic fields. Unlike in previous analysis
of perturbed 2d cluster states, we find strong evidence of a very well defined
cluster phase, separated from a polarized phase by a line of 1st and 2nd order
transitions compatible with the 3d Ising universality class and a tricritical
end point. The phase boundary sets an upper bound for the amount of
perturbation in the system so that its ground state is still useful for
measurement-based quantum computation purposes. Moreover, we also compute the
local fidelity with the unperturbed 2d cluster state. Besides a classical
approximation, we determine the phase diagram by combining series expansions
and variational infinite Projected entangled-Pair States (iPEPS) methods. Our
work constitutes the first analysis of the non-trivial effect of few-body
perturbations in the 2d cluster state, which is of relevance for experimental
proposals.Comment: 7 pages, 4 figures, revised version, to appear in PR
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