2,807 research outputs found
First and second order clustering transitions for a system with infinite-range attractive interaction
We consider a Hamiltonian system made of classical particles moving in
two dimensions, coupled via an {\it infinite-range interaction} gauged by a
parameter . This system shows a low energy phase with most of the particles
trapped in a unique cluster. At higher energy it exhibits a transition towards
a homogenous phase. For sufficiently strong coupling an intermediate phase
characterized by two clusters appears. Depending on the value of the
observed transitions can be either second or first order in the canonical
ensemble. In the latter case microcanonical results differ dramatically from
canonical ones. However, a canonical analysis, extended to metastable and
unstable states, is able to describe the microcanonical equilibrium phase. In
particular, a microcanonical negative specific heat regime is observed in the
proximity of the transition whenever it is canonically discontinuous. In this
regime, {\it microcanonically stable} states are shown to correspond to {\it
saddles} of the Helmholtz free energy, located inside the spinodal region.Comment: 4 pages, Latex - 3 EPS Figs - Submitted to Phys. Rev.
KASCADE: Astrophysical results and tests of hadronic interaction models
KASCADE is a multi-detector setup to get redundant information on single air
shower basis. The information is used to perform multiparameter analyses to
solve the threefold problem of the reconstruction of (i)the unknown primary
energy, (ii) the primary mass, and (iii) to quantify the characteristics of the
hadronic interactions in the air-shower development. In this talk recent
results of the KASCADE data analyses are summarized concerning cosmic ray
anisotropy studies, determination of flux spectra for different primary mass
groups, and approaches to test hadronic interaction models. Neither large scale
anisotropies nor point sources were found in the KASCADE data set. The energy
spectra of the light element groups result in a knee-like bending and a
steepening above the knee. The topology of the individual knee positions shows
a dependency on the primary particle. Though no hadronic interaction model is
fully able to describe the multi-parameter data of KASCADE consistently, the
more recent models or improved versions of older models reproduce the data
better than few years ago.Comment: to appear in Nucl. Phys. B (Proc. Suppl.), Proc. of the XIII
ISVHECRI, Pylos 2004 - with a better quality of the figure
Anomalous diffusion as a signature of collapsing phase in two dimensional self-gravitating systems
A two dimensional self-gravitating Hamiltonian model made by
fully-coupled classical particles exhibits a transition from a collapsing phase
(CP) at low energy to a homogeneous phase (HP) at high energy. From a dynamical
point of view, the two phases are characterized by two distinct single-particle
motions : namely, superdiffusive in the CP and ballistic in the HP. Anomalous
diffusion is observed up to a time that increases linearly with .
Therefore, the finite particle number acts like a white noise source for the
system, inhibiting anomalous transport at longer times.Comment: 10 pages, Revtex - 3 Figs - Submitted to Physical Review
Rancang Bangun Sistem Infromasi Pengukuran Kesehatan Laporan Keuangan pada Perusahaan Jasa (Studi Kasus Perusahaan Jasa yang Terdaftar di BEI)
Pertumbuhan ekonomi Indonesia dalam beberapa waktu terakhir masuk ke dalam peringkat ketiga tertinggi di dunia di bawah China dan India. Setiap jenis usaha yang tetap dan terus menerus yang didirikan untuk bekerja dan berdudukan dalam Negara Republik Indonesia ber tujuan memperoleh keuntungan atau laba. Untuk mengetahui keuntungan atau laba setiap Perusahaan dibutuhkan laporan keuangan.Penelitian ini bertujuan untuk merancang suatu aplikasi perhitungan laporan keuangan perbankan yang memiliki fitur manajemen user yang dapat menampilkan output berupa laporan keuangan, daftar bank yang digunakan untuk menampilkan hasil perhitungan dan juga dapat menampilkan grafik tingkat kesehatan keuangan berdasarkan perhitungan sebelumnya.Metode yang digunakan dalam pengukuran kinerja laporan keuangan adalah metode RGEC (Risk Profile, Earnings, Capital) yang terdiri dari rasio, % rasio, peringkat dan kriteria. Dengan bahasa pemrograman PHP, Java Script, HTML dan pengujian sistem menggunakan Black-Box Testing, hasil akhir yang diperoleh dari penelitian ini berupa hasil analisis laporan keuangan dan grafik tingkat kesehatan laporan keuangan Perusahaan
Model Gaya Kepemimpinan Yang Mempengaruhi Kinerja Bawahan
Gaya kepemimpinan dalam sebuah proyek konstruksi memegang peranan penting dalam mencapai tujuan proyek. Gaya kepememimpinan dan pengaruhnya terhadap bawahan berbeda-beda bagi setiap individu. Dalam penelitian ini, penulis membandingkan antara gaya kepemimpinan dan inovasi gaya kepemimpinan dalam mempengaruhi kinerja bawahan. Penulis menggunakan kuisioner dengan sistem skala likert untuk mengetahui seberapa besar pengaruh pengaruh setiap indikator dari gaya kepemimpinan, inovasi gaya kepemimpinan dan kinerja bawahan. Tujuannya adalah untuk menentukan faktor– faktor yang dapat mempengaruhi gaya kepemimpinan, menentukan faktor – faktor yang dapat mempengaruhi inovasi keterampilan kepemimpinan, menentukan faktor – faktor yang dapat mempengaruhi kinerja bawahan, serta membuat sebuah model gaya kepemimpinan yang mempengaruhi kinerja bawahan yang terdiri dari gaya kepemimpinan, inovasi keterampilan kepemimpinan, dan kinerja bawahan
Dissecting the knee - Air shower measurements with KASCADE
Recent results of the KASCADE air shower experiment are presented in order to
shed some light on the astrophysics of cosmic rays in the region of the knee in
the energy spectrum. The results include investigations of high-energy
interactions in the atmosphere, the analysis of the arrival directions of
cosmic rays, the determination of the mean logarithmic mass, and the unfolding
of energy spectra for elemental groups
Solvable model of a phase oscillator network on a circle with infinite-range Mexican-hat-type interaction
We describe a solvable model of a phase oscillator network on a circle with
infinite-range Mexican-hat-type interaction. We derive self-consistent
equations of the order parameters and obtain three non-trivial solutions
characterized by the rotation number. We also derive relevant characteristics
such as the location-dependent distributions of the resultant frequencies of
desynchronized oscillators. Simulation results closely agree with the
theoretical ones
The KASCADE-Grande Experiment and the LOPES Project
KASCADE-Grande is the extension of the multi-detector setup KASCADE to cover
a primary cosmic ray energy range from 100 TeV to 1 EeV. The enlarged EAS
experiment provides comprehensive observations of cosmic rays in the energy
region around the knee. Grande is an array of 700 x 700 sqm equipped with 37
plastic scintillator stations sensitive to measure energy deposits and arrival
times of air shower particles. LOPES is a small radio antenna array to operate
in conjunction with KASCADE-Grande in order to calibrate the radio emission
from cosmic ray air showers. Status and capabilities of the KASCADE-Grande
experiment and the LOPES project are presented.Comment: To appear in Nuclear Physics B, Proceedings Supplements, as part of
the volume for the CRIS 2004, Cosmic Ray International Seminar: GZK and
Surrounding
Cosmic Ray Energy Spectra and Mass Composition at the Knee - Recent Results from KASCADE -
Recent results from the KASCADE experiment on measurements of cosmic rays in
the energy range of the knee are presented. Emphasis is placed on energy
spectra of individual mass groups as obtained from an two-dimensional unfolding
applied to the reconstructed electron and truncated muon numbers of each
individual EAS. The data show a knee-like structure in the energy spectra of
light primaries (p, He, C) and an increasing dominance of heavy ones (A > 20)
towards higher energies. This basic result is robust against uncertainties of
the applied interaction models QGSJET and SIBYLL which are used in the shower
simulations to analyse the data. Slight differences observed between
experimental data and EAS simulations provide important clues for further
improvements of the interaction models. The data are complemented by new limits
on global anisotropies in the arrival directions of CRs and by upper limits on
point sources. Astrophysical implications for discriminating models of maximum
acceleration energy vs galactic diffusion/drift models of the knee are
discussed based on this data.Comment: 8 pages, 7 figures, to appear in Nuclear Physics B, Proceedings
Supplements, as part of the volume for the CRIS 2004, Cosmic Ray
International Seminar: GZK and Surrounding
To what extent can dynamical models describe statistical features of turbulent flows?
Statistical features of "bursty" behaviour in charged and neutral fluid
turbulence, are compared to statistics of intermittent events in a GOY shell
model, and avalanches in different models of Self Organized Criticality (SOC).
It is found that inter-burst times show a power law distribution for turbulent
samples and for the shell model, a property which is shared only in a
particular case of the running sandpile model. The breakdown of self-similarity
generated by isolated events observed in the turbulent samples, is well
reproduced by the shell model, while it is absent in all SOC models considered.
On this base, we conclude that SOC models are not adequate to mimic fluid
turbulence, while the GOY shell model constitutes a better candidate to
describe the gross features of turbulence.Comment: 14 pages, 4 figures, in press on Europhys. Lett. (may 2002
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