5,317 research outputs found
QGSJET-II: results for extensive air showers
The new hadronic Monte Carlo model QGSJET-II is applied for extensive air
shower (EAS) calculations. The obtained results are compared to the predictions
of the original QGSJET and of the SIBYLL 2.1 interaction models. It is shown
that non-linear effects change substantially model predictions for
hadron-nucleus interactions and produce observable effects for calculated EAS
characteristics. Finally the impact of the new model on the interpretation of
air shower array data is discussed.Comment: To appear in the proceedings of 13th International Symposium on Very
High-Energy Cosmic Ray Interactions at the NESTOR Institute, Pylos, Greece,
6-12 Sep 200
Inhomogeneous Quasi-stationary States in a Mean-field Model with Repulsive Cosine Interactions
The system of N particles moving on a circle and interacting via a global
repulsive cosine interaction is well known to display spatially inhomogeneous
structures of extraordinary stability starting from certain low energy initial
conditions. The object of this paper is to show in a detailed manner how these
structures arise and to explain their stability. By a convenient canonical
transformation we rewrite the Hamiltonian in such a way that fast and slow
variables are singled out and the canonical coordinates of a collective mode
are naturally introduced. If, initially, enough energy is put in this mode, its
decay can be extremely slow. However, both analytical arguments and numerical
simulations suggest that these structures eventually decay to the spatially
uniform equilibrium state, although this can happen on impressively long time
scales. Finally, we heuristically introduce a one-particle time dependent
Hamiltonian that well reproduces most of the observed phenomenology.Comment: to be published in J. Phys.
PERAN TAX PLANNING SEBAGAI PEMODERASI DETERMINAN NILAI PERUSAHAAN
Tujuan penelitian ini untuk mengetahui kemampuan tax planning memoderasi kebijakan dividen, biaya modal, agency cost terhadap nilai perusahaan. Tax planning sebagai strategi perusahaan dalam meminimumkan beban pajak terhutang perusahaan, dengan efisiensi itu maka nilai perusahaan meningkat. Penelitian ini menggunakan data sekunder berupa laporan keuangan perusahaan manufaktur yang terdaftar di Bursa Efek Indonesia periode 2019. Variabel yang digunakan dalam penelitian ini adalah variabel eksogen yaitu kebijakan dividen, biaya modal dan agency cost. Selain itu penelitian ini menggunakan variabel endogen berupa nilai perusahaan dan variabel moderating yaitu tax planning. Penelitian ini menggunakan analisis deskriptif untuk menggambarkan variabel penelitian dan statistic verifikatif untuk menguji hipotesis dengan alat bantu Structural Equation Modelling (SEM). Hasil penelitian menunjukkan tax planning mampu menjalankan perannya sebagai moderating pada pengaruh kebijakan dividen terhadap nilai perusahaan dan pengaruh agency cost terhadap nilai perusahaan sedangkan pengaruh biaya modal terhadap nilai perusahaan. Tax planning tidak mampu meoderasi pengaruh keduanya
Probabilistic coding of quantum states
We discuss properties of probabilistic coding of two qubits to one qutrit and
generalize the scheme to higher dimensions. We show that the protocol
preservers entanglement between qubits to be encoded and environment and can be
also applied to mixed states. We present the protocol which enables encoding of
n qudits to one qudit of dimension smaller than the Hilbert space of the
original system and then probabilistically but error-free decode any subset of
k qudits. We give a formula for the probability of successful decoding
Chaotic dynamics and superdiffusion in a Hamiltonian system with many degrees of freedom
We discuss recent results obtained for the Hamiltonian Mean Field model. The
model describes a system of N fully-coupled particles in one dimension and
shows a second-order phase transition from a clustered phase to a homogeneous
one when the energy is increased. Strong chaos is found in correspondence to
the critical point on top of a weak chaotic regime which characterizes the
motion at low energies. For a small region around the critical point, we find
anomalous (enhanced) diffusion and L\'evy walks in a transient temporal regime
before the system relaxes to equilibrium.Comment: 7 pages, Latex, 6 figures included, Contributed paper to the Int.
Conf. on "Statistical Mechanics and Strongly Correlated System", 2nd Giovanni
Paladin Memorial, Rome 27-29 September 1999, submitted to Physica
Temperature contour maps at the strain-induced martensitic transition of a Cu–Zn–Al shape-memory single crystal
We study temperature changes at the reverse strain-induced martensitic transformation in a Cu–Zn–Al single crystal. Infrared thermal imaging reveals a markedly inhomogeneous temperature distribution. The evolution of the contour temperature maps enables information to be extracted on the kinetics of the interface motion
Towards symmetric scheme for superdense coding between multiparties
Recently Liu, Long, Tong and Li [Phys. Rev. A 65, 022304 (2002)] have
proposed a scheme for superdense coding between multiparties. This scheme seems
to be highly asymmetric in the sense that only one sender effectively exploits
entanglement. We show that this scheme can be modified in order to allow more
senders to benefit of the entanglement enhanced information transmission.Comment: 6 page
ST2 and Multimarker Testing in Acute Decompensated Heart Failure
Most data on heart failure biomarkers have been derived from patient cohorts with chronic disease. However, risk prediction in patients admitted with acute decompensated heart failure (ADHF) remains a challenge. ADHF is not a single disease: it presents in various manners, and different causes may underlie ADHF, which may be reflected by different biomarkers. Soluble suppression of tumorigenicity 2 (ST2) has been shown to be a strong independent predictor of short-, mid-, and long-term outcome in ADHF. Furthermore, combining biomarkers may help further improve the prognostic power of ST2. The ProBNP Investigation of Dyspnea in the Emergency Department study showed that elevated plasma levels of ST2 together with elevated levels of 4 other biomarkers have clear incremental values to predict outcome in ADHF. The Multinational Observational Cohort on Acute Heart Failure study is an international collaborative network that recruited 5,306 patients hospitalized for ADHF that demonstrated that ST2 and midregional pro-adrenomedulin had independently strong value to predict 30-day and 1-year outcome in patients with ADHF. The Multinational Observational Cohort on Acute Heart Failure study also showed that C-reactive protein plus ST2 better classified risk in patients with ADHFs than ST2 alone. Combining biomarkers for risk prediction or risk stratification might have clinical and more importantly pathophysiological meaning
Are mesenchymal stem cells and derived extracellular vesicles valuable to halt the COVID-19 inflammatory cascade? Current evidence and future perspectives
- …