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Search Results: 1 - 10 of 3736 matches for " TO Sato "
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On Supersymmetry of the Covariant 3-Algebra Model for M-Theory  [PDF]
Matsuo Sato
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311226
Abstract: We examine a natural supersymmetric extension of the bosonic covariant 3-algebra model for M-theory proposed in [1]. It possesses manifest SO(1,10) symmetry and is constructed based on the Lorentzian Lie 3-algebra associated with the U(N) Lie algebra. There is no ghost related to the Lorentzian signature in this model. It is invariant under 64 supersymmetry transformations although the supersymmetry algebra does not close. From the model, we derive the BFSS matrix theory and the IIB matrix model in a large N limit by taking appropriate vacua.
Analysis of the Tracer Diffusion Phenomena through Cracks in the Porous Media by Means of X-Ray CT  [PDF]
Akira Sato
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.48A003

The migration process of contamination materials in the porous rock mass was visualized and analyzed by X-ray CT image data. In this study, Kimachi sandstone, which had approximately 26% porosity, was used as a rock sample. Here two cases of diffusion phenomena were analyzed. One is the case that solute diffuses into the porous rock mass from the crack surfaces, and it simulates the contamination process of rock mass. Another is the case that the solute diffuses out of the porous rock mass, and it simulates the process that the contamination materials spread from highly contaminated sources. It was found that the diffusion phenomena were clearly visualized by X-ray CT method. By introducing the parameter, coefficient of tracer density increment α, quantitative analysis of tracer density became possible, and the relation between the density distribution of tracer and the crack apertures and the relation between the density distribution and porosity distribution became clear.

Zariski 3-Algebra Model of M-Theory  [PDF]
Matsuo Sato
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.44A006

We review on Zariski 3-algebra model of M-theory. The model is obtained by Zariski quantization of a semi-light-cone supermembrane action. The model has manifest N=1 supersymmetry in eleven dimensions and its relation to the supermembrane action is clear.

Factors Affecting Minimum Foot Clearance in the Elderly Walking: A Multiple Regression Analysis  [PDF]
Keizo Sato
Open Journal of Therapy and Rehabilitation (OJTR) , 2015, DOI: 10.4236/ojtr.2015.34015
Abstract: Because falls among the elderly can cause serious injury leading to a bedridden state, methods to maintain motor function in the elderly and prevent falls are important. Among falls by the elderly are tripping falls, in which the forefoot gets caught on the floor to cause the fall. Minimum foot clearance (MFC), the smallest distance between the floor and the foot during the swing phase of gait, has been given attention as a cause of tripping falls, as elderly people at risk of falling have been reported to have low MFC. No research has been done, however, to examine what geriatric factors determine MFC. In this study, various measurements were taken on muscle strength, joint angles, and other characteristics as factors possibly influencing the height of MFC, a multiple regression analysis was performed with MFC as the dependent variable, and those factors with high degrees of influence were extracted. The results revealed that the height of MFC is highly influenced by strength of the hip flexors and angle of ankle dorsiflexion. The results of this study should be taken into consideration when having elderly people do fall prevention training.
Structure Analysis for Hydrate Models of Ethyleneimine Oligomer by Quantum Chemical Calculation  [PDF]
Minoru Kobayashi, Hisaya Sato
Pharmacology & Pharmacy (PP) , 2010, DOI: 10.4236/pp.2010.12009
Abstract: Structure analyses for hydrate models of ethyleneimine oligomer (5-mer as model of PEI) were investigated by quantum chemical calculations. Conformation energies and structures optimized for hydrate models of (ttt)5 and (tgt)5 conformers were examined. Hydrate ratio, h [h = H2O/N (mol)], was set from 0.5 to 2. In anhydrates, (tg+t)5 conformer was more stable (?1.8 kcal/m.u.) than (ttt)5. In hydrates, (ttt)5 conformers were more stable (?0.7 - ?4.3) than (tg+t)5. These results corresponded to experimental results that anhydrous linear PEI crystal changes from double helical to single planar chain in hydration process. Structures calculated for (ttt)5 agreed in those observed for hydrates of PEI. In all (tg+t)5 conformers, O???H bonds between waters were found with the decreases of N???H bonds between imino group and water. The O???H bonds in (tg+t)5 conformer resulted in its high chain torsion, and strongly related with instability and structure change (large swelling).
A Theoretical Study on Van Der Pauw Measurement Values of Inhomogeneous Compound Semiconductor Thin Films  [PDF]
Toru Matsumura, Yuichi Sato
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.15048
Abstract: The influence of intermixing heterogeneous regions that have different electrical properties from the base materials on van der Pauw measurement values was theoretically studied by computer simulation using the finite-element method. The measurement samples selected were thin films of inhomogeneous semiconductors. Calculated electrical properties, such as resistivity, carrier density, and mobility of the thin films, varied in predictable ways when heterogeneous regions were dispersed in wide ranges over the samples. On the other hand, the mobility of the thin films showed a different change when heterogeneous regions were locally concentrated in the measurement samples.
Postoperative Apnea Induced by Fentanyl and Other Multiple Respiratory-Modulating Factors  [PDF]
Chie Matsuda, Jiro Sato
Open Journal of Anesthesiology (OJAnes) , 2014, DOI: 10.4236/ojanes.2014.48025

Purpose: Opioids are concerned as a major cause of postoperative respiratory depression. In the immediate postoperative period, however, other factors can produce instability of breathing such as pain, agitation, and residual effects of anesthetics. Such factors might be overlooked masked by the fear for opioid-induced respiratory depression. We report a case who presented apnea immediately after emergence from anesthesia that we considered was produced by an interaction among such factors accompanied with fentanyl-induced respiratory depression. Clinical Features: A 31-year-old woman underwent ovarian cystectomy under general anesthesia with continuous infusions of propofol and remifentanil, and bolus doses of fentanyl. Transversus abdominis plane blocks with ropivacaine were given upon completion of surgery. She complained of severe wound pain and was agitated at the emergence from anesthesia. Fentanyl 50 μg was administered intravenously. In several minutes, she developed apnea, unconsciousness, and difficulty of mechanical ventilation via a face mask. The estimated effect site concentration at the onset of the episode (2.9 ng·ml-1) was approximately the same (3.0 ng·ml-1) as after 30 min when she regained consciousness and spontaneous breathing. It indicated that not only direct inhibition of the respiratory center by fentanyl but also other stimulatory and inhibitory factors contributed to respiratory arrest. Conclusion: In the immediate postoperative period, transient factors, such as pain, mental instability

Unsteady Behavior of Cavitating Waterjet in an Axisymmetric Convergent-Divergent Nozzle: High Speed Observation and Image Analysis Based on Frame Difference Method  [PDF]
Shota Hayashi, Keiichi Sato
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2014, DOI: 10.4236/jfcmv.2014.23011
Abstract: Although it is well known that cloud cavitation shows unsteady behavior with the growing motion of an attached cavity, the shedding motion of a cloud, the collapsing motion of the cloud shed downstream and a reentrant motion in flow fields such as on a 2-D hydrofoil and in a convergent- divergent channel with a rectangular cross-section, observations for the periodic behavior of cloud cavitation in a cylindrical nozzle with a convergent-divergent part, which is mainly used in an industrial field, have hardly been conducted. From engineering viewpoints, it is important to elucidate the mechanism of periodic cavitation behavior in a cylindrical nozzle. In this study, a high-speed observation technique with an image analysis technique was applied to the cloud cavitation behavior in the nozzle to make clear the mechanism of unsteady behavior. As a result, it was observed in the nozzle that the periodic behavior occurs in the cloud cavitation and pressure waves form at the collapse of clouds shed downstream. Also, it was found through the image analysis based on the present technique that the pressure wave plays a role as a trigger mechanism to cause a reentrant motion at the downstream end of an attached cavity.
Uncertainty in a Measurement of Density Dependence on Population Fluctuations  [PDF]
Hiro-Sato Niwa
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.58104

This article discusses the question of how elasticity of the system is intertwined with external stochastic disturbances. The speed at which a displaced system returns to its equilibrium is a measure of density dependence in population dynamics. Population dynamics in random environments, linearized around the equilibrium point, can be represented by a Langevin equation, where populations fluctuate under locally stable (not periodic or chaotic) dynamics. I consider a Langevin model in discrete time, driven by time-correlated random forces, and examine uncertainty in locating the population equilibrium. There exists a time scale such that for times shorter than this scale the dynamics can be approximately described by a random walk; it is difficult to know whether the system is heading toward the equilibrium point. Density dependence is a concept that emerges from a proper coarse-graining procedure applied for time-series analysis of population data. The analysis is illustrated using time-series data from fisheries in the North Atlantic, where fish populations are buffeted by stochastic harvesting in a random environment.

Core and Networking in L2 Lexical Teaching in an Input-Poor Context  [PDF]
Masanobu Sato, Shigenori Tanaka
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.45058
Abstract: This paper discusses problems in developing L2 lexical competence in an input-poor environment, and suggests what we can do so as to minimize the negative effects of those problems on L2 lexical learning. As an unavoidable problem, we discussed a learner strategy unequivocally used by Japanese students when learning the meaning of a new word. To enhance L2 lexical learning, we suggested that lexical core, combined with the notion of network building, has a lot of pedagogical potential. With two cases (the preposition on, and the basic verbs of communication), we demonstrated how the core schema of a lexical item(s) becomes a common thread that weaves both intra-lexical and inter-lexical networks.
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