5,838 research outputs found
Pengaruh Mekanisme Corporate Governance dan Pengungkapan Corporate Social Responsibility terhadap Nilai Perusahaan
Penelitian ini bertujuan untuk menguji pengaruh mekanisme corporate governance dan pengungkapan corporate social responsibility terhadap nilai Perusahaan. Mekanisme corporate governance dalam penelitian ini menggunakan tiga variabel yaitu frekuensi rapat dewan komisaris, kepemilikan manajerial, dan kepemilikan institusional. Pengungkapan corporate social responsibility dalam penelitian ini menggunakan Corporate Social Disclosure Index (CSDI). Sedangkan nilai Perusahaan diukur menggunakan rasio Tobin's Q. Penelitian ini menggunakan 39 sampel dari Perusahaan pertambangan dan energi yang terdaftar di Bursa Efek Indonesia (BEI) dari tahun 2009 sampai tahun 2011 dengan metode pengambilan sampel purposive sampling. Penelitian ini menggunakan metode analisis regresi berganda untuk menganalis data. Hasil penelitian menunjukkan bahwa kepemilikan manajerial, kepemilikan institusional dan pengungkapan corporate social responsibility berpengaruh terhadap nilai Perusahaan. Sedangkan frekuensi rapat dewan komisaris tidak berpengaruh terhadap nilai Perusahaan
The lattice Schwarzian KdV equation and its symmetries
In this paper we present a set of results on the symmetries of the lattice
Schwarzian Korteweg-de Vries (lSKdV) equation. We construct the Lie point
symmetries and, using its associated spectral problem, an infinite sequence of
generalized symmetries and master symmetries. We finally show that we can use
master symmetries of the lSKdV equation to construct non-autonomous
non-integrable generalized symmetries.Comment: 11 pages, no figures. Submitted to Jour. Phys. A, Special Issue SIDE
VI
Kinetic Antiferromagnetism in the Triangular Lattice
We show that the motion of a single hole in the infinite Hubbard model
with frustrated hopping leads to weak metallic antiferromagnetism of kinetic
origin. An intimate relationship is demonstrated between the simplest versions
of this problem in 1 and 2 dimensions, and two of the most subtle many body
problems, namely the Heisenberg Bethe ring in 1-d and the 2-dimensional
triangular lattice Heisenberg antiferromagnet.Comment: 10 pages, 2 figures, 5 supplementary figures; Figures fixe
Infinitely many symmetries and conservation laws for quad-graph equations via the Gardner method
The application of the Gardner method for generation of conservation laws to
all the ABS equations is considered. It is shown that all the necessary
information for the application of the Gardner method, namely B\"acklund
transformations and initial conservation laws, follow from the multidimensional
consistency of ABS equations. We also apply the Gardner method to an asymmetric
equation which is not included in the ABS classification. An analog of the
Gardner method for generation of symmetries is developed and applied to
discrete KdV. It can also be applied to all the other ABS equations
Pure quantum freezing of the 5 dimension
It is shown that superthin and superlong gravitational flux tube solutions in
the 5D Kaluza-Klein gravity have the region where the metric
signature changes from to . Such change is too
quickly from one of the paradigms of quantum gravity which tells that the
Planck length is the minimal length in the nature and consequently the physical
quantities can not change very quickly in the course of this length. For
avoiding such dynamic it is supposed that a pure quantum freezing of the
dynamic of the dimension takes place. As the continuation of the flux
tube metric in the longitudinal direction the Reissner-Nordstr\"om metric is
proposed. In the consequence of such construction one can avoid the appearance
of a point-like singularity in the extremal Reissner-Nordstr\"om solution.Comment: grammar errors are correcte
Magnetostrictive Neel ordering of the spin-5/2 ladder compound BaMn2O3: distortion-induced lifting of geometrical frustration
The crystal structure and the magnetism of BaMnO have been studied by
thermodynamic and by diffraction techniques using large single crystals and
powders. BaMnO is a realization of a spin ladder as the
magnetic interaction is dominant along 180 Mn-O-Mn bonds forming the
legs and the rungs of a ladder. The temperature dependence of the magnetic
susceptibility exhibits well-defined maxima for all directions proving the
low-dimensional magnetic character in BaMnO. The susceptibility and
powder neutron diffraction data, however, show that BaMnO exhibits a
transition to antiferromagnetic order at 184 K, in spite of a full frustration
of the nearest-neighbor inter-ladder coupling in the orthorhombic
high-temperature phase. This frustration is lifted by a remarkably strong
monoclinic distortion which accompanies the magnetic transition.Comment: 9 pages, 8 figures, 2 tables; in V1 fig. 2 was included twice and
fig. 4 was missing; this has been corrected in V
Radial Distribution Function for Semiflexible Polymers Confined in Microchannels
An analytic expression is derived for the distribution of the
end-to-end distance of semiflexible polymers in external potentials
to elucidate the effect of confinement on the mechanical and statistical
properties of biomolecules. For parabolic confinement the result is exact
whereas for realistic potentials a self-consistent ansatz is developed, so that
is given explicitly even for hard wall confinement. The
theoretical result is in excellent quantitative agreement with fluorescence
microscopy data for actin filaments confined in rectangularly shaped
microchannels. This allows an unambiguous determination of persistence length
and the dependence of statistical properties such as Odijk's deflection
length on the channel width . It is shown that neglecting the
effect of confinement leads to a significant overestimation of bending
rigidities for filaments
Intrinsic peculiarities of real material realizations of a spin-1/2 kagome lattice
Spin-1/2 magnets with kagome geometry, being for years a generic object of
theoretical investigations, have few real material realizations. Recently, a
DFT-based microscopic model for two such materials, kapellasite Cu3Zn(OH)6Cl2
and haydeeite Cu3Mg(OH)6Cl2, was presented [O. Janson, J. Richter and H.
Rosner, arXiv:0806.1592]. Here, we focus on the intrinsic properties of real
spin-1/2 kagome materials having influence on the magnetic ground state and the
low-temperature excitations. We find that the values of exchange integrals are
strongly dependent on O--H distance inside the hydroxyl groups, present in most
spin-1/2 kagome compounds up to date. Besides the original kagome model,
considering only the nearest neighbour exchange, we emphasize the crucial role
of the exchange along the diagonals of the kagome lattice.Comment: 4 pages, 4 figures. A paper for the proceedings of the HFM 2008
conferenc
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