296,449 research outputs found
An effective criterion for Eulerian multizeta values in positive characteristic
Characteristic p multizeta values were initially studied by Thakur, who
defined them as analogues of classical multiple zeta values of Euler. In the
present paper we establish an effective criterion for Eulerian multizeta
values, which characterizes when a multizeta value is a rational multiple of a
power of the Carlitz period. The resulting "t-motivic" algorithm can tell
whether any given multizeta value is Eulerian or not. We also prove that if
zeta_A(s_1,...,s_r) is Eulerian, then zeta_A(s_2,...,s_r) has to be Eulerian.
When r=2, this was conjectured (and later on conjectured for arbitrary r) by
Lara Rodriguez and Thakur for the zeta-like case from numerical data. Our
methods apply equally well to values of Carlitz multiple polylogarithms at
algebraic points and zeta-like multizeta values.Comment: 32 page
Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model
This article presents an original code for Big Bang Nucleosynthesis in a
baryon inhomogeneous model of the universe. In this code neutron diffusion
between high and low baryon density regions is calculated simultaneously with
the nuclear reactions and weak decays that compose the nucleosynthesis process.
The size of the model determines the time when neutron diffusion becomes
significant. This article describes in detail how the time of neutron diffusion
relative to the time of nucleosynthesis affects the final abundances of He4,
deuterium and Li7. These results will be compared with the most recent
observational constraints of He4, deuterium and Li7. This inhomogeneous model
has He4 and deuterium constraints in concordance for baryon to photon ratio eta
= (4.3 - 12.3) X 10^{-10} Li7 constraints are brought into concordance with the
other isotope constraints by including a depletion factor as high as 5.9. These
ranges for the baryon to photon ratio and for the depletion factor are larger
than the ranges from a Standard Big Bang Nucleosynthesis model.Comment: 7/15, added reference
Compton Scattering by the Proton using a Large-Acceptance Arrangement
Compton scattering by the proton has been measured using the tagged-photon
facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The new
data are interpreted in terms of dispersion theory based on the SAID-SM99K
parameterization of photo-meson amplitudes. It is found that two-pion exchange
in the t-channel is needed for a description of the data in the second
resonance region. The data are well represented if this channel is modeled by a
single pole with mass parameter m(sigma)=600 MeV. The asymptotic part of the
spin dependent amplitude is found to be well represented by pi-0-exchange in
the t-channel. A backward spin-polarizability of
gamma(pi)=(-37.1+-0.6(stat+syst)+-3.0(model))x10^{-4}fm^4 has been determined
from data of the first resonance region below 455 MeV. This value is in a good
agreement with predictions of dispersion relations and chiral pertubation
theory. From a subset of data between 280 and 360 MeV the resonance
pion-photoproduction amplitudes were evaluated leading to a E2/M1 multipole
ratio of the p-to-Delta radiative transition of EMR(340
MeV)=(-1.7+-0.4(stat+syst)+-0.2(model))%. It was found that this number is
dependent on the parameterization of photo-meson amplitudes. With the MAID2K
parameterization an E2/M1 multipole ratio of EMR(340
MeV)=(-2.0+-0.4(stat+syst)+-0.2(model))% is obtained
Efektivitas Komunikasi BPD Desa Lara dalam Menyalurkan Aspirasi Masyarakat di desa Lara Kecamatan Baebunta Kabupaten Luwu Utara
Hasil penelitian menunjukkan bahwa komunikasi BPD Desa Lara efektif dalam menampung dan menyalurkan aspirasi masyarakat Desa Lara. Diperoleh nilai t hitung sebesar 4.785 dan t table 1,981, karena t jadi Ha diterima dan Ho ditolak. Dengan kata lain menolak hipotesis nol (Ho) dan menerima hipotesisal ternatif (Ha) untuk pengujian kedua variabel. Sementara itu, Berdasarkan nilai Rsquare dari hasil hitung sebelumnya adalah 0,170 yang berada pada nilai 0,00-0,199 maka hal ini membuktikan bahwa tingkat efektivitas komunikasi BPD terhadap penyaluran aspirasi masyarakat sangat rendah. Penelitian ini hanya memperoleh 17% besarnya pengaruh efektivitas komunikasi BPD terhadap aspirasi masyarakat. Sisanya 83% dipengaruhi oleh faktor lain
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