505 research outputs found
The Fate of a Five-Dimensional Rotating Black Hole via Hawking Radiation
We study the evolution of a five-dimensional rotating black hole emitting
scalar field radiation via the Hawking process for arbitrary initial values of
the two rotation parameters and . It is found that any such black hole
whose initial rotation parameters are both nonzero evolves toward an asymptotic
state
, where this constant is independent
of the initial values of and .Comment: 6 pages, 6 figure
Variation of dimethylsulfide mixing ratio over the Southern Ocean from 36°S to 70°S
AbstractAtmospheric dimethylsulfide (DMS) was measured to investigate the variation in its concentration over sea ice free oceans and sea ice regions of the Southern Ocean, using a proton transfer reaction-mass spectrometer (PTR-MS) on board the icebreaker Shirase from 1 December 2009 to 16 March 2010. In general, DMS concentrations over sea ice regions were very low compared with those over the sea ice free ocean. However, abrupt increases in DMS concentrations occurred over sea ice regions while the ship was moving and crushing the sea ice. Undoubtedly, the elevated DMS concentrations were caused by large DMS emissions from gaps in the ice made by the ship. During the period when Shirase had anchored off Syowa Station (69°00.4′S, 39°35.3′E), Antarctica, DMS concentrations were not detected. At this time, the surrounding sea of East Ongul island, on which Syowa Station is located, was completely covered with multi-year fast ice. Sea ice probably inhibits DMS emission from the ocean to the atmosphere. In addition, there was no evidence that chlorophyll a concentration in the sea water or wind speed above the sea surface affect atmospheric DMS concentrations over the sea ice free ocean regions
How to distinguish the Haldane/Large-D state and the intermediate-D state in an S=2 quantum spin chain with the XXZ and on-site anisotropies
We numerically investigate the ground-state phase diagram of an S=2 quantum
spin chain with the and on-site anisotropies described by , where denotes the XXZ anisotropy parameter of the
nearest-neighbor interactions and the on-site anisotropy parameter. We
restrict ourselves to the and case for simplicity. Our main
purpose is to obtain the definite conclusion whether there exists or not the
intermediate- (ID) phase, which was proposed by Oshikawa in 1992 and has
been believed to be absent since the DMRG studies in the latter half of 1990's.
In the phase diagram with and there appear the XY state, the
Haldane state, the ID state, the large- (LD) state and the N\'eel state. In
the analysis of the numerical data it is important to distinguish three gapped
states; the Haldane state, the ID state and the LD state. We give a physical
and intuitive explanation for our level spectroscopy method how to distinguish
these three phases.Comment: Proceedings of "International Conference on Frustration in Condensed
Matter (ICFCM)" (Jan. 11-14, 2011, Sendai, Japan
Analyses of Histocompability and Isozyme Variations in Triploid Fish, Carassius auratus langsdorfii
Clonal diversity of triploid gynogenetic fish, Carassius auratus langsdorfii, was examined by tissue grafts and electrophoreses of several enzymes and muscle protein. The hypervariabilities of histocompatibility clones and electromorph clones were observed in wild-caught specimens. The ratio of DNA value of each specimen to control diploid fish varied from 1.38 to 2.01. Unidirectional histocompatibility and protein variations in histocompatibility clones were the characteristics of this gynogenetic fish. These facts seem to indicate the divergence of a clone. Tissue-incompatibility was observed betweeen F脀 progeny of triploid ginbuna × Shubunkin. Some of offspring expressed the male-dependent transparent-scaled character. This indicates the fact that fusions of female and male pronuclei must have occured. In the other strain, random reductions of DNA values were observed. The divergence of a clone must have been caused by the gene addition or loss.Article信州大学理学部紀要 19(1): 9-25(1984)departmental bulletin pape
Generating arbitrary polarization states by manipulating the thicknesses of a pair of uniaxial birefringent plates
We report an optical method of generating arbitrary polarization states by
manipulating the thicknesses of a pair of uniaxial birefringent plates, the
optical axes of which are set at a crossing angle of {\pi}/4. The method has
the remarkable feature of being able to generate a distribution of arbitrary
polarization states in a group of highly discrete spectra without spatially
separating the individual spectral components. The target polarization-state
distribution is obtained as an optimal solution through an exploration. Within
a realistic exploration range, a sufficient number of near-optimal solutions
are found. This property is also reproduced well by a concise model based on a
distribution of exploration points on a Poincar\'e sphere, showing that the
number of near-optimal solutions behaves according to a power law with respect
to the number of spectral components of concern. As a typical example of an
application, by applying this method to a set of phase-locked highly discrete
spectra, we numerically demonstrate the continuous generation of a vector-like
optical electric field waveform, the helicity of which is alternated within a
single optical cycle in the time domain.Comment: 7 pages, 5 figure
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