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Search Results: 1 - 10 of 1004 matches for " Ryo Orito "
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A New Rotator Interval Approach for Antegrade Humeral Nailing: A Technical Note  [PDF]
Naxin Liu, Toshikazu Mohri, Junzou Hayashi, Ryo Orito, Tsuyoshi Nakai, Yasushi Yoneda
Open Journal of Orthopedics (OJO) , 2014, DOI: 10.4236/ojo.2014.411049
Abstract: The lateral and anterior lateral approaches are the most commonly used for antegrade nailing of humerus fractures. However, the surgical exposure is restricted by the bony acromion. The iatrogenic injury to the rotator cuff can also cause post-operative pain and compromise shoulder function. This article describes a new rotator interval approach that we used for central entry point nailing. In this approach, the skin incision starts from the midpoint between the acromion and coracoid process. A trans-rotator interval split in front of the anterior border of the supraspinatus (SSP) tendon is then made to open the glenohumeral joint. With the SSP retracted laterally and the long head of the biceps (LHB) retracted medially, the humeral head is directly visualized. The entry point can thus be determined and confirmed by intra-operative fluoroscopy in both axial and AP planes. We recommend this rotator interval approach as an alternative nailing technique for 2-part humeral neck fractures and humeral shaft fractures.
Friendship Motivation, Aggression, and Self-Esteem in Japanese Undergraduate Students  [PDF]
Ryo Okada
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.31002
Abstract: The purpose of this study was to examine the relationship among self-determined friendship motivation (motivation for friendship formation), aggression, and self-esteem in a sample of 262 Japanese university students. The hypothetical model posited that self-determined friendship motivation predicted lower levels of aggression, which, in turn, predicted lower levels of self-esteem. The results showed that self-determined friendship motivation predicted lower levels of anger, hostility, and physical aggression and that hostility and anger predicted lower levels of self-esteem. Verbal aggression was found to be positively associated with self-determined friendship motivation and self-esteem. The different relationships between self-determined friendship motivation and each facet of aggression are discussed.
Pareto Distribution of Wealth Based on Overlapping Generation Model  [PDF]
Ryo Nagata
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.811155
Abstract: In this paper, we shed light on the Pareto distribution of wealth on the basis of an overlapping generation model. We deduce in the model that the basic reason for a particular shape of Pareto distribution is attributed to the distribution of utility function among consumers. More specifically, we show that a formula relating the distribution of utility function to the distribution of wealth is analytically obtainable on the basis of the Cobb-Douglas utility function. By simulation, we recognize that the formula actually gives us a well approximation of a Pareto distribution.
Neutrinos and Big-Bang Nucleosynthesis
Physics , 1998, DOI: 10.1016/S0375-9474(97)00734-3
Abstract: Observations of clusters and super clusters of galaxies have indicated that the Universe is more dominated by baryons than ever estimated in the homogeneous cosmological model for primordial nucleosynthesis. Recent detections of possibly low deuterium abundance in Lyman-$\alpha$ clouds along the line of sight to high red-shift quasars have raised another potential difficulty that \he4 is overproduced in any cosmological models which satisfy the low deuterium abundance constraint. We show that the inhomogeneous cosmological model with degenerate electron-neutrino can resolve these two difficulties.
Hadron colliders as the ``neutralino factory'': Search for a slow decay of the lightest neutralino at the CERN LHC
K. Maki,S. Orito
Physics , 1997, DOI: 10.1103/PhysRevD.57.554
Abstract: Prospects are examined for the detection of a slow decay of the lightest neutralino (or any other longlived particles) at the CERN LHC and at Very Large Hadron Collider (VLHC). We first point out that such hadron colliders will become the ``neutralino factory'' producing 10^6--10^9 neutralinos/yr, if gluinos and/or squarks actually exist below O(1) TeV. The lightest neutralino (\neu), usually assumed to be stable, will be unstable if lighter superparticles such as the gravitino (\gra) or axino (\axi) exist, or R-parity is not conserved. The decay signal would, however, be missed in usual collider experiments, particularly when the decay mostly occurs outside the detector. In order to search for such a slow decay of \neu, we propose a dedicated experiment where the collision products are dumped by a thick shield, which is followed by a long decay tunnel. The decay product of \neu can be detected by a detector located at the end of the tunnel. The slow arrival time and the large off angle (to the direction of the interaction point) of the decay product will provide a clear signature of slowly decaying \neu's. One can explore the decay length (c\tau) in a wide range, i.e., 0.2 m to 1x10^5 km for \mneu=25 GeV and 1 m to 2 km for \mneu=200 GeV at the LHC. This corresponds to the range of the SUSY breaking scale \rtF=2x10^5 to 2x10^7 GeV in case of the \neu\to\gamma\gra decay predicted in gauge-mediated SUSY breaking models. At VLHC, one can extend the explorable range of \mneu up to 1000 GeV, and that of \rtF up to 1x10^8 GeV. In case of the \neu\to\gamma\axi decay, the Peccei- Quinn symmetry breaking scale F_a can be explored up to 5x10^11 GeV. The mass of the decaying particle can be determined by using the correlation between the energy and the arrival time of the decay product.
Photobiont Flexibility in Paramecium bursaria: Double and Triple Photobiont Co-Habitation  [PDF]
Ryo Hoshina, Yuko Fujiwara
Advances in Microbiology (AiM) , 2012, DOI: 10.4236/aim.2012.23027
Abstract: The green ciliate, Paramecium bursaria, has evolved a mutualistic relationship with endosymbiotic green algae (photobionts). Under culture conditions, photobionts are usually unified (to be single species) within each P. bursaria strain. In most cases, the algal partners are restricted to either Chlorella variabilis or Micractinium reisseri (Chlorellaceae, Trebouxiophyceae). Both species are characterized by particular physiology and atypical group I intron insertions, although they are morphologically indistinguishable from each other or from other Chlorella-related species. Both algae are exclusive species that are viable only within P. bursaria cells, and therefore their symbiotic relationship can be considered persistent. In a few cases, the other algal species have been reported as P. bursaria photobionts. Namely, P. bursaria have occasionally replaced their photobiont partner. This paper introduces some P. bursaria strains that maintain more than one species of algae for a long period. This situation prompts speculations about flexibility of host-photo-biont relationships, how P. bursaria replaced these photobionts, and the infection theory of the group I introns.
Effects of Heavy Metal Pollution of Apple Orchard Surface Soils Associated with Past Use of Metal-Based Pesticides on Soil Microbial Biomass and Microbial Communities  [PDF]
Masakazu Aoyama, Ryo Tanaka
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.44A005

Apple orchard surface soils in Japan are polluted with copper (Cu), lead (Pb), and arsenic (As) due to long-term use of metal-based pesticides. We investigated the effects of heavy metals accumulated in the surface soils in apple orchards on the microbial biomass and the microbial communities. Soil samples were taken from a chestnut orchard (unpolluted control) and five apple orchards with different degrees of heavy metal pollution. Total concentrations of Cu, Pb, and As in soil ranged from 29 to 931 mg/kg, 35 to 771 mg/kg, and 11 to 198 mg/kg, respectively. The amount of microbial biomass carbon expressed on a soil organic carbon basis decreased with increasing concentrations of heavy metals. Thus, the heavy metals that accumulated in apple orchard surface soils had adverse effects on the soil microbial biomass. The analysis of phospholipid fatty acid (PLFA) composition indicated that the microbial community structure had changed because of the pesticide-derived heavy metals in soil. The relative abundance of gram-positive bacterial marker PLFAs increased and that of fungal marker PLFA decreased with increasing concentrations of heavy metals in soil. Denaturing gradient gel electrophoreses targeting the 16S ribosomal RNA gene of bacteria and the 18S ribosomal RNA gene of fungi also showed shifts in the composition of bacterial and fungal communities induced by soil pollution with heavy metals. However, the diversity of microbial communities was not significantly affected by the heavy metal pollution. This was attributable to the adaptation of the microbial communities in apple orchard surface soils to heavy metals derived from previously used pesticides.

Dynamic Routing for Emergency Vehicle by Collecting Real-Time Road Conditions  [PDF]
Ryo Katsuma, Shin Yoshida
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2018, DOI: 10.4236/ijcns.2018.112003
Abstract: When a natural disaster such as earthquake strikes, people go away to safety areas by cars. Some roads are broken and impenetrable by buildings falling down. Furthermore, some fixed infrastructures for radio communication may be broken. In order to quickly bring ambulances and fire trucks to their destinations, it is necessary to provide real-time road conditions to these emergency vehicles via ad-hoc networks. In this paper, we propose a method to periodically reconstruct a route for an emergency vehicle by collecting real-time road conditions via vehicle ad-hoc networks. As simulation results, we confirmed that the proposed method collects 12% more road conditions than existing method. We also confirmed that the proposed method achieves 10% faster arrival than the existing method.
Lattice of Finite Group Actions on Prism Manifolds  [PDF]
John E. Kalliongis, Ryo Ohashi
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.23022
Abstract: The set of finite group actions (up to equivalence) which operate on a prism manifold M, preserve a Heegaard Klein bottle and have a fixed orbifold quotient type, form a partially ordered set. We describe the partial ordering of these actions by relating them to certain sets of ordered pairs of integers. There are seven possible orbifold quotient types, and for any fixed quotient type we show that the partially ordered set is isomorphic to a union of distributive lattices of a certain type. We give necessary and sufficent conditions, for these partially ordered sets to be isomorphic and to be a union of Boolean algebras.
Phase-Conjugate-State Pairs in Entangled States
Ryo Namiki
Journal of Atomic, Molecular, and Optical Physics , 2012, DOI: 10.1155/2012/854693
Abstract: We consider the probability that a bipartite quantum state contains phase-conjugate-state (PCS) pairs and/or identical-state pairs as signatures of quantum entanglement. While the fraction of the PCS pairs directly indicates the property of a maximally entangled state, the fraction of the identical-state pairs negatively determines antisymmetric entangled states such as singlet states. We also consider the physical limits of these probabilities. This imposes fundamental restrictions on the pair appearance of the states with respect to the local access of the physical system. For continuous-variable system, we investigate similar relations by employing the pairs of phase-conjugate coherent states. We also address the role of the PCS pairs for quantum teleportation in both discrete-variable and continuous-variable systems.
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