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Search Results: 1 - 10 of 137 matches for " Kenzo Maehashi "
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Label-Free Electrical Detection Using Carbon Nanotube-Based Biosensors
Kenzo Maehashi,Kazuhiko Matsumoto
Sensors , 2009, DOI: 10.3390/s90705368
Abstract: Label-free detections of biomolecules have attracted great attention in a lot of life science fields such as genomics, clinical diagnosis and practical pharmacy. In this article, we reviewed amperometric and potentiometric biosensors based on carbon nanotubes (CNTs). In amperometric detections, CNT-modified electrodes were used as working electrodes to significantly enhance electroactive surface area. In contrast, the potentiometric biosensors were based on aptamer-modified CNT field-effect transistors (CNTFETs). Since aptamers are artificial oligonucleotides and thus are smaller than the Debye length, proteins can be detected with high sensitivity. In this review, we discussed on the technology, characteristics and developments for commercialization in label-free CNT-based biosensors.
Study on Sustainable Rainwater Resource Utilization—Towards Deepening of Homo Environmentics  [PDF]
Akira Hiratsuka, Kenzo Wakae
Journal of Water Resource and Protection (JWARP) , 2019, DOI: 10.4236/jwarp.2019.115029
Abstract: This paper mainly investigated the value of the rainwater by introducing a “Logic of Encounter” that is a new logic beyond the logos and lemma through the metaphors which compare the real rainwater to one’s life. A consideration regarding sustainable rainwater resource utilization has been described and the main results are summarized in the paper.
Evolution of radon dose evaluation
Fujimoto Kenzo
Nuclear Technology and Radiation Protection , 2004, DOI: 10.2298/ntrp0401003f
Abstract: The historical change of radon dose evaluation is reviewed based on the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) reports. Since 1955, radon has been recognized as one of the important sources of exposure of the general public. However, it was not really understood that radon is the largest dose contributor until 1977 when a new concept of effective dose equivalent was introduced by International Commission on Radiological Protection. In 1982, the dose concept was also adapted by UNSCEAR and evaluated per caput dose from natural radiation. Many researches have been carried out since then. However, lots of questions have remained open in radon problems, such as the radiation weighting factor of 20 for alpha rays and the large discrepancy of risk estimation among dosimetric and epidemiological approaches.
Generations of Quarks and Leptons from Noncompact Horizontal Symmetry
Kenzo Inoue
Physics , 1994, DOI: 10.1143/PTP.93.403
Abstract: The three chiral generations of quarks and leptons may be generated through a spontaneous breakdown of the noncompact horizontal gauge symmetry $G_{H}$ which governs, together with the standard gauge symmetry ${SU(3) \times SU(2) \times U(1)}$, the world in a vectorlike manner. In a framework of supersymmetric theory, the simplest choice ${G_{H}=SU(1,1)}$ works quite well for this scenario in which quarks, leptons and Higgses belong to infinite dimensional unitary representation of $SU(1,1)$. The relevance of the scenario to the hierarchical structure of their Yukawa coupling matrices are discussed.
Study of the reappearance of sieve plate-like pores in immortalized sinusoidal endothelial cells – Effect of actin inhibitor in mixed perfusion cultures
Saito Masaya,Matsuura Tomokazu,Masaki Takahiro,Maehashi Haruka
Comparative Hepatology , 2004, DOI: 10.1186/1476-5926-2-s1-s28
Controlled Metal Detector Mounted on Mine Detection Robot
Seiji Masunaga,Kenzo Nonami
International Journal of Advanced Robotic Systems , 2008,
Abstract: Landmine detection capability of metal detectors is very sensitive to the gap between buried landmines and the sensor heads. Therefore, human deminers manually scan ground surface with the metal detectors in such a manner that the sensor heads follow the ground surface. In case of robots assisted landmine detection, this function can be performed accurately and safely by controlling the gap and attitude of the sensor heads. In this investigation, the effectiveness of the gap and attitude control of the sensor head by some mechanical manipulator on the landmine detection performance has been addressed quantitatively. To this end, the paper describes the development of a Controlled Metal Detector (CMD) for controlling the gap and attitude of the sensor head. The CMD generates trajectories of the sensor head from the depth information of the ground surface acquired with 3D stereovision camera in order to avoid any obstacles and possible impact with the ground, and then tracks the trajectories with a trajectory-tracking controller. The effectiveness and the impact related to the gap and attitude control on the landmine detection performance of the CMD have been demonstrated by experimental studies.
A Mean Field Theory for the Quantum Hall Liquid. II --- The Vortex Solution
Kenzo Ishikawa,Nobuki Maeda
Physics , 1993, DOI: 10.1143/PTP.91.237
Abstract: In the Fractional Quantum Hall state, we introduce a bi-local mean field and get vortex mean field solutions. Rotational invariance is imposed and the solution is constructed by means of numerical self-consistent method. It is shown that vortex has a fractional charge, a fractional angular momentum and a magnetic field dependent energy. In $\nu=1/3$ state, we get finite energy gap at $B=10,15,20[T]$. We find that the gap vanishes at $B=5.5[T]$ and becomes negative below it. The uniform mean field becomes unstable toward vortex pair production below $B=5.5[T]$.
A Mean Field Analysis of One Dimensional Quantum Liquid with Long Range Interaction
Kenzo. Ishikawa,Nobuki. Maeda
Physics , 1993, DOI: 10.1016/0375-9601(94)90923-7
Abstract: Bi-local mean field theory is applied to one dimensional quantum liquid with long range $1/r^2$ interaction, which has exact ground state wave function. We obtain a mean field solution and an effective action which expresses a long range dynamics. Based on them the ground state energy and correlation functions are computed. The ground state energy agrees fairly well with the exact value and exponents have weaker coupling constant dependence than that of partly known exact value.
On analyticity with respect to the replica number in random energy models II: zeros on the complex plane
Kenzo Ogure,Yoshiyuki Kabashima
Physics , 2008, DOI: 10.1088/1742-5468/2009/05/P05011
Abstract: We characterize the breaking of analyticity with respect to the replica number which occurs in random energy models via the complex zeros of the moment of the partition function. We perturbatively evaluate the zeros in the vicinity of the transition point based on an exact expression of the moment of the partition function utilizing the steepest descent method, and examine an asymptotic form of the locus of the zeros as the system size tends to infinity. The incident angle of this locus indicates that analyticity breaking is analogous to a phase transition of the second order. We also evaluate the number of zeros utilizing the argument principle of complex analysis. The actual number of zeros calculated numerically for systems of finite size agrees fairly well with the analytical results.
Flux State in von Neumann lattice and Fractional Hall Effect
Kenzo Ishikawa,Nobuki Maeda
Physics , 1996, DOI: 10.1143/PTP.97.507
Abstract: Formulation of quantum Hall dynamics using von Neumann lattice of guiding center coordinates is presented. A topological invariant expression of the Hall conductance is given and a new mean field theory of the fractional Hall effect based on flux condensation is proposed. Because our mean field Hamiltonian has the same form as Hofstadter Hamiltonian, it is possible to understand characteristic features of the fractional Hall effect from Hofstadter's spectrum. Energy gap and other physical quantities are computed and are compared with the experiments. A reasonable agreement is obtained.
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