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Search Results: 1 - 10 of 146992 matches for " F. Kobayashi "
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Electrochemical Characterization of Plasma Sprayed Alumina Coatings  [PDF]
Magdi. F. MORKS, Ivan COLE, Penny Corrigan, Akira KOBAYASHI
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.13016
Abstract: Open circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) were employed to characterize the corrosion behavior of plasma-sprayed alumina-coated mild steel in 3.5 wt% NaCl solu-tion. Alumina-coated steel showed higher OCP and lower corrosion current (icorr.) compared with the steel substrate. However, localized corrosion probably occurs at the coat/steel interface when immersed in the corrosive media. The reason for that is the penetration of corrosive solution into the steel surface through the pores of accumulated alumina layers. The corrosion products (mainly iron oxides) accumulate inside the pores and on the coating surface. The presence of iron oxide slightly improved the corrosion resistance.
Effect of δ Phase on Hydrogen Embrittlement of Inconel 718 by Notch Tensile Tests
Akio Hirose,Kojiro F.Kobayashi
材料科学技术学报 , 2005,
Abstract: The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were prepared with different heat treatments, and hydrogen was charged into the tensile specimens before tensile tests via a cathodic charging process. The loss of notch tensile strength (NTS) due to the charged hydrogen was used to evaluate the hydrogen embrittlement sensitivity. The results show that δ phase has deleterious effect on NTSs, and the fracture of hydrogen-charged specimens initiated near the notch surfaces. The loss of NTS caused by precharged hydrogen can be greatly decreased by dissolving δ phase. δ-free Inconel 718 alloy is proposed for the applications in hydrogen environments.
Attractant and Oviposition Stimulant of Crataeva religiosa Forst. to Pieris rapae
H. Ikeura,F. Kobayashi,Y. Hayata
Asian Journal of Plant Sciences , 2010,
Abstract: We were aimed to confirm the oviposition preference of P. rapae against C. religiosa (Capparidaceae plant) and cabbage (Brassicaceae plant) and then analyzed the AITC and sinigrin contents and myrosinase activity in these plants to clarify the attractant and oviposition stimulant properties of C. religiosa and cabbage to P. rapae. We analyzed the attractant and oviposition stimulant of a Brassicaceae plant, Brassica oleracea var. capitata L. (cabbage) and a Capparidaceae plant, Crataeva religiosa to Pieri srapae crucivora Boisduval by the oviposition preference test. The oviposition preference of P. rapae was the highest in cabbage, followed by C. religiosa, but the lettuce (control plant) was rarely selected. Allylisothiocyanate (AITC), which is assumed to be one of the attractant and sinigrin as oviposition stimulants were detected in cabbage using GC-MS. Their compounds were not detected in C. religiosa, but the higher content of methylisothiocyanate (MITC) that is analogous to AITC was found. Myrosinase activity was analyzed by HPLC and detected in cabbage and C. religiosa, but not in lettuce. Glucosinolate of sinigrin analogous in C. religiosa fractionated by HPLC was decreased by myrosinase treatment and then produced MITC. We identified that this compound was glucocapparin as a precursor of MITC by LC-MS. These results revealed that C. religiosa have a glucosinolate-myrosinase metabolic system and pathway.
Quantum nondemolition measurement of a light field component by a feedback compensated beam splitter
Holger F. Hofmann,Takayoshi Kobayashi,Akira Furusawa
Physics , 2001,
Abstract: In conventional quantum nondemolition measurements, the interaction between signal and probe preserves the measured variable. Alternatively, it is possible to restore the original value of the variable by feedback. In this paper, we describe a quantum nondemolition measurement of a quadrature component of the light field using a feedback compensated beam splitter. The noise induced by the vacuum port of the beam splitter is compensated by a linear feedback resulting in an effective amplification of the observed variable. This amplification is then be reversed by optical parametric amplification to restore the original value of the field component.
Nonclassical correlations of photon number and field components in the vacuum state
Holger F. Hofmann,Takayoshi Kobayashi,Akira Furusawa
Physics , 1999, DOI: 10.1103/PhysRevA.62.013806
Abstract: It is shown that the quantum jumps in the photon number n from zero to one or more photons induced by backaction evasion quantum nondemolition measurements of a quadrature component x of the vacuum light field state are strongly correlated with the quadrature component measurement results. This correlation corresponds to the operator expectation value which is equal to one fourth for the vacuum even though the photon number eigenvalue is zero. Quantum nondemolition measurements of a quadrature component can thus provide experimental evidence of the nonclassical operator ordering dependence of the correlations between photon number and field components in the vacuum state.
Effects of Trilinear Term in Softly Broken N=1 Supersymmetric QCD
M. Chaichian,W. F. Chen,T. Kobayashi
Physics , 2000,
Abstract: Softly broken dual magnetic theory of N=1 supersymmetric SU(N_c) QCD with N_f flavours is investigated with the inclusion of trilinear coupling term of scalar fields in the case of N_f>N_c+1. It is found that the trilinear soft supersymmetric breaking term greatly change the phase and the vacuum structure.
Quantum jumps in backaction evasion measurements of a light field component
Holger F. Hofmann,Takayoshi Kobayashi,Akira Furusawa
Physics , 2000,
Abstract: Backaction evasion measurements of a quadrature component of the light field vacuum necessarily induce quantum jumps in the photon number. The correlation between measurement results and quantum jump events reveals fundamental nonclassical aspects of quantization.
Photon echo signature of vibrational cat states created by femtosecond excitation of molecules
Holger F. Hofmann,Takao Fuji,Takayoshi Kobayashi
Physics , 2000, DOI: 10.1088/1464-4266/4/2/303
Abstract: A pair of coherent femtosecond pulse excitations applied to a molecule with strong electron-phonon coupling creates a coherent superposition of a low momentum and a high momentum wavepacket in the vibrational states of both the excited state and the ground state of the coherent transition. As the excited state is accelerated further, interference between the high momentum ground state contribution and the low momentum excited state contribution causes a photon echo. This photon echo is a direct consequence of quantum interference between separate vibrational trajectories and can therefore provide experimental evidence of the non-classical properties of molecular vibrations.
Correlations of measurement information and noise in quantum measurements with finite resolution
Holger F. Hofmann,Takayoshi Kobayashi,Akira Furusawa
Mathematics , 2000,
Abstract: The original purpose of measurements is to provide us with information about a previously unknown physical property of the system observed. In the Hilbert space formalism of quantum mechanics, this physical meaning of measurement information is not immediately apparent. In order to study the relationship between the Hilbert space coherence of the quantum state and the measurement information obtained in the laboratory, we introduce a generalized measurement postulate for finite resolution measurements. With this measurement model, correlations between non-commuting observables can be investigated. These experimentally accessible correlations reveal nonclassical features in their dependence on the operator ordering, reflecting the particular measurement context by which they are determined.
Attractor-Based Simultaneous Design of the Minimum Set of Control Nodes and Controllers in Boolean Networks  [PDF]
Koichi Kobayashi
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.714131
Abstract: Design of control strategies for gene regulatory networks is a challenging and important topic in systems biology. In this paper, the problem of finding both a minimum set of control nodes (control inputs) and a controller is studied. A control node corresponds to a gene that expression can be controlled. Here, a Boolean network is used as a model of gene regulatory networks, and control specifications on attractors, which represent cell types or states of cells, are imposed. It is important to design a gene regulatory network that has desired attractors and has no undesired attractors. Using a matrix-based representation of BNs, this problem can be rewritten as an integer linear programming problem. Finally, the proposed method is demonstrated by a numerical example on a WNT5A network, which is related to melanoma.
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