Utsunomiya University

About: Utsunomiya University is a education organization based out in Utsunomiya, Japan. It is known for research contribution in the topics: Laser & Holography. The organization has 4139 authors who have published 6812 publications receiving 91975 citations. The organization is also known as: Utsunomiya daigaku.

Frequency upshift in the interaction of a high power microwave with an inhomogeneous plasma

Abstract: A frequency upshift of several megahertz is observed in the interaction of a high power microwave (${\mathrm{f}}_{0}$=9 GHz) with an unmagnetized inhomogeneous argon plasma. The dependencies of the frequency upshift on the plasma density, incident microwave power and space have been investigated. The induced frequency upshift is considered to be related to a rapidly expanding plasma created by the ponderomotive force of a strong standing wave.

Holographic Correloscopy—Unconventional Holographic Techniques For Imaging a Three-Dimensional Object Through an Opaque Diffuser or Via a Scattering Wall: A Review

Abstract: Techniques of unconventional holography, called holographic correloscopy, for imaging a three-dimensional (3-D) object through an opaque diffuser or via a scattering wall are reviewed. This paper is not intended to be a general overview. Instead, it will focus and shed light on less-known techniques termed coherence holography, photon-correlation holography, remote imaging digital holography, and dual-reference holography. This paper will introduce how they perform 3-D imaging through a diffuser or via a scattering wall with a thin but strongly scattering layer.

Hadronic interactions and primary-cosmic-ray composition at energies around 10(15)-10(16) eV derived from the analysis of high-energy gamma families.

Abstract: Gross features of gamma families observed at Mt. Kanbala (5500 m above sea level) and Mt. Fuji (3750 m) are summarized in comparison with a Monte Carlo simulation based on a plausible assumption about hadronic interactions and primary composition. Our analysis shows that the assumption of approximate Feynman scaling in the fragmentation region and a heavy-enriched primary composition in the energy range over 10/sup 15/ eV is wholly compatible with the experimental data. That is, there is no evidence of strong violation of Feynman scaling in the fragmentation region at least up to 10/sup 16/ eV. As to the primary cosmic rays, our data infer a steepening of proton spectrum at energies around 10/sup 14/ eV. The proton component in the primary cosmic rays is estimated to occupy 15--20 % of the total flux at 10/sup 15/ eV. Some other interesting implications on hadronic interactions are discussed with reference to the structures of gamma families.

Linoleic acid, α-linolenic acid, and monolinolenins as antibacterial substances in the heat-processed soybean fermented with Rhizopus oligosporus

Abstract: Antibacterial activities against Staphylococcus aureus and Bacillus subtilis were found in an ethanol fraction of tempe, an Indonesian fermented soybean produced using Rhizopus oligosporus. The ethanol fraction contained free fatty acids, monoglycerides, and fatty acid ethyl esters. Among these substances, linoleic acid and α-linolenic acid exhibited antibacterial activities against S. aureus and B. subtilis, whereas 1-monolinolenin and 2-monolinolenin exhibited antibacterial activity against B. subtilis. The other free fatty acids, 1-monoolein, monolinoleins, ethyl linoleate, and ethyl linolenate did not exhibit bactericidal activities. These results revealed that R. oligosporus produced the long-chain polyunsaturated fatty acids and monolinolenins as antibacterial substances against the Gram-positive bacteria during the fungal growth and fermentation of heat-processed soybean.

Efficient extreme ultraviolet emission from one-dimensional spherical plasmas produced by multiple lasers

Abstract: We demonstrate high conversion efficiency for extreme ultraviolet (EUV) emission at 6.5–6.7 nm from multiple laser beam-produced one-dimensional spherical plasmas. Multiply charged-state ions produce strong resonance emission lines, which combine to yield intense unresolved transition arrays (UTAs) in Gd, Tb, and Mo. At an optimum laser intensity of 1 × 1012 W/cm2, which is estimated to yield an electron temperature of around 100 eV, the maximum in-band EUV conversion efficiency (CE) was observed to be 0.8%, which is one of the highest values ever reported due to the reduction of plasma expansion loss.