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Natural purification effects in the river in consideration with domestic wastewater pollutant discharge reduction effects

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Journal of Environmental Sciences 2010年第6期22卷 892-897页

作者： Yoshiaki Tsuzuki Masato Fujii Yasuo Mochihara Kouki Matsuda Minoru yoneda Research Center for Coastal Lagoon Environments Shimane University Ministry of Land InfrastructureTransportation and Tourism Environmental Engineering Graduate School of EngineeringKyoto University

The first social experiment program in Japan to reduce domestic wastewater pollutant discharge by ＂soft interventions＂ in households has been conducted in the Yamato-gawa River drainage area since 2005. The Yamato-gawa River has been listed as one of the worst water quality rivers in Japan because of the larger annual average BOD. ＂Hard interventions＂ including deployment of wastewater treatment facilities and artificial installation of natural purification facilities in the river has been conducted in these years to improve river water quality. At the first Yamato-gawa River social experiment program （YR-SEP） in March 2005, BOD at the monitoring point near the river mouth decreased about 6% during the Program. Natural purification effect along the river was evaluated in this article with one-dimensional water quality model for the six river sections. Larger biological oxygen consumption rate, kb, was estimated in the sections with artificially installed natural purification facilities. The effect of ＂soft interventions＂ in households in the YR-SEP was estimated as 25% BOD decrease in the nearest monitoring point to the river mouth, when all the households participate in the Program and BOD discharge reduction rate with ＂soft interventions＂ in households was 40%.

关键词： Yamato-gawa River "soft interventions" in households one-dimensional water quality model

Analytical Solutions of Electromagnetic Fields from Current Dipole Moment on Spherical Conductor in a Low-Frequency Approximation

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Communications in Theoretical Physics 2010年第1期53卷 149-155页

作者： Taishi Okita toshiyuki Takagi Institute of Fluid Science Tohoku University

We analytically derive the solutions for electromagnetic fields of electric current dipole moment, which is placed in the exterior of the spherical homogeneous conductor, and is pointed along the radial direction. The dipole moment is driven in the low frequency f = 1 kHz and high frequency f = 1 GHz regimes. The electrical properties of the conductor are appropriately chosen in each frequency. Electromagnetic fields are rigorously formulated at an arbitrary point in a spherical geometry, in which the magnetic vector potential is straightforwardly given by the Biot- Savart formula, and the scalar potential is expanded with the Legendre polynomials, taking into account the appropriate boundary conditions at the spherical surface of the conductor. The induced electric fields are numerically calculated along the several paths in the low and high frequeny excitation. The self-consistent solutions obtained in this work will be of much importance in a wide region of electromagnetic induction problems.

关键词： Eddy magnetic induction

Novel insights into the mechanism of reactive oxygen species-mediated neurodegeneration

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Neural Regeneration Research 2023年第4期18卷 746-749页

作者： Shuji Wakatsuki toshiyuki Araki Department of Peripheral Nervous System Research National Institute of NeuroscienceNational Center of Neurology and PsychiatryTokyoJapan

Neurite degeneration,a major component of many neurodegenerative diseases,such as Parkinson’s disease,Alzheimer’s disease,and amyotrophic lateral sclerosis,is not part of the typical apoptosis signaling mechanism,but rather it appears that a self-destructive process is in *** stress is a well-known inducer of neurodegenerative pathways:neuronal cell death and neurite *** oxidative stress exerts cytotoxic effects leading to neuronal loss,the pathogenic mechanisms and precise signaling pathways by which oxidative stress causes neurite degeneration have remained entirely *** previously reported that reactive oxygen species generated by NADPH oxidases induce activation of the E3 ubiquitin ligase ZNRF1 in neurons,which promotes neurite *** this process,the phosphorylation of an NADPH oxidase subunit p47-phox at the 345serine residue serves as an important checkpoint to initiate the ZNRF1-dependent neurite *** provides new insights into the mechanism of reactive oxygen species-mediated *** this review,we focus specifically on reactive oxygen species-induced neurite degeneration by highlighting a phosphorylation-dependent regulation of the molecular interaction between ZNRF1 and the NADPH oxidase complex.

关键词： neurite degeneration oxidative stress phosphorylation reactive oxygen species ubiquitin ligase

On Univalence of the Power Deformation z（f（z）/z）c

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Chinese Annals of Mathematics,Series B 2012年第6期33卷 823-830页

作者： Yong Chan KIM toshiyuki SUGAWA Department of Mathematics Education Yeungnam University Graduate School of Information Sciences Tohoku University

The authors mainly concern the set Uf of c E C such that the power deformation z（f-（z）/z）c is univalent in the unit disk ｜z｜〈 1 for a given analytic univalent function f（z） = z ＋ a2z2 ＋ ... in the unit disk. It is shown that Uf is a compact, polynomially convex subset of the complex plane C unless f is the identity function. In particular, the interior of Uf is simply connected. This fact enables us to apply various versions of the X-lemma for the holomorphic family z（f（z）/z）c of injections parametrized over the interior of Uf. The necessary or sufficient conditions for Uf to contain 0 or 1 as an interior point are also given.

关键词： Univalent function Holomorphic motion Quasiconformal extension Grunsky inequality Univalence criterion

Numerical Analysis of Flow in Ultra Micro Centrifugal Compressor -Influence of Meridional Configuration

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Journal of Thermal Science 2013年第2期22卷 111-116页

作者： Masanao Kaneko Hoshio Tsujita toshiyuki Hirano Graduate School of Engineering Hosei University Department of Mechanical Engineering Faculty of Science and EngineeringHosei University Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology

A single stage ultra micro centrifugal compressor constituting ultra micro gas turbine is required to operate at high rotational speed in order to achieve the pressure ratio which establishes the gas turbine cycle. As a conse- quence, the aerodynamic losses can be increased by the interaction of a shock wave with the boundary layer on the blade surface. Moreover, the centrifugal force which exceeds the allowable s^ress of the impeller material can act on the root of blades. On the other hand, the restrictions of processing technology for the downsizing of im- peller not only relatively enlarge the size of tip clearance but also make it difficult to shape the impeller with the i three-dimensional blade. Therefore, it is important to establish the design technology for the impeller with the two-dimensional blade which possesses the sufficient aerodynamic performance and enough strength to bear the centrifugal force caused by the high rotational speed. In this study, the flow in two types of impeller with the two-dimensional blade which have different meridional configuration was analyzed numerically, The computed results clarified the influence of the meridional configuration on the loss generations in the impeller passage.

关键词： Ultra Micro Centrifugal Compressor Two-dimensional Blade Gas Turbine Numerical Analysis

Effect of Double Air Injection on Performance Characteristics of Centrifugal Compressor

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Journal of Thermal Science 2015年第1期24卷 10-16页

作者： toshiyuki Hirano Mizuki Takano Hoshio Tsujita Mechanical Engineering Course Department of Science and Engineering Kokushikan University Advanced Course of Mechanical Engineering Program Tokyo Metropolitan College of Industrial Technology 10-40Higashi-oi 1-chome Shinagawa CityTokyo 140-0011 Tokyo Japan Department of Mechanical Engineering Faculty of Science and Engineering Hosei University

In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, for the suppression of surge phenomenon resulting in the extension of the stable operating range of centrifugal compressor to lower flow rate, the compressed air at the compressor exit was re-circulated and injected into the impeller inlet by using the double injection nozzle system. The experiments were performed to find out the optimum circumferential position of the second nozzle relative to the fixed first one and the optimum inner diameter of the injection nozzles, which are able to most effectively reduce the flow rate of surge inception. Moreover, in order to examine the universality of these optimum values, the experiments were carried out for two types of compressors.

关键词： Centrifugal Compressor Performance Nozzle Injection Surge

Effects of wing deformation on aerodynamic performance of a revolving insect wing

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Acta Mechanica Sinica 2014年第6期30卷 819-827页

作者： Ryusuke Noda toshiyuki Nakata Hao Liu Graduate School of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Center (SJTU-CUICRC) Structure and Motion Laboratory The Royal Veterinary CollegeUniversity of London Hawkshead LaneNorth Mymms Hatfield AL9 7TA United Kingdom

Flexible wings of insects and bio-inspired micro air vehicles generally deform remarkably during flapping flight owing to aerodynamic and inertial forces,which is of highly nonlinear fluid-structure interaction（FSI）*** elucidate the novel mechanisms associated with flexible wing aerodynamics in the low Reynolds number regime,we have built up a FSI model of a hawkmoth wing undergoing revolving and made an investigation on the effects of flexible wing deformation on aerodynamic performance of the revolving wing *** take into account the characteristics of flapping wing kinematics we designed a kinematic model for the revolving wing in two-fold：acceleration and steady rotation,which are based on hovering wing kinematics of hawkmoth,Manduca *** results show that both aerodynamic and inertial forces demonstrate a pronounced increase during acceleration phase,which results in a significant wing *** the aerodynamic force turns to reduce after the wing acceleration terminates due to the burst and detachment of leading-edge vortices（LEVs）,the dynamic wing deformation seem to delay the burst of LEVs and hence to augment the aerodynamic force during and even after the *** the phase of steady rotation,the flexible wing model generates more ver-tical force at higher angles of attack（40°–60°）but less horizontal force than those of a rigid wing *** is because the wing twist in spanwise owing to aerodynamic forces results in a reduction in the effective angle of attack at wing tip,which leads to enhancing the aerodynamics performance by increasing the vertical force while reducing the horizontal ***,our results point out the importance of the fluid-structure interaction in evaluating flexible wing aerodynamics：the wing deformation does play a significant role in enhancing the aerodynamic performances but works differently during acceleration and steady rotation,which is mainly induced by inertial force in accelerati

关键词： Insect flight Flexible wing Revolving wing Fluid-structure interaction

Prototyping of Ultra Micro Centrifugal Compressor-Influence of Meridional Configuration

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Journal of Thermal Science 2011年第4期20卷 312-317页

作者： toshiyuki Hirano Tadataka Muto Hoshio Tsujita Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology Graduate School of Engineering Hosei University3-7-2KajinochoKoganei-shiTokyo184-8584Japan Department of Mechanical Engineering Faculty of Science and EngineeringHosei University

In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.

关键词： Ultra Micro Centrifugal Compressor Performance Characteristics Impeller Meridional Configuration

Post-analysis simulation of the collapse of an open sabo dam of steel pipes subjected to boulder laden debris flow

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International Journal of Sediment Research 2020年第6期35卷 621-635页

作者： toshiyuki Horiguchi Vincent Richefeu Department of Civil Engineering National Defense Academy Universite Grenoble Alpes Laboratoire 3SR (solsSolidesStructuresRisques)

The objective of the proposed method is to utilize a site investigation of a debris flow disaster and verify a real scale analysis to evaluate the impulsive load on an open sabo *** Nagiso debris flow disaster which occurred in Nagano in 2014,where damage caused by Typhoon Neogri was *** verification result of the site investigation demonstrated the weak components of the open Sabo dam experienced damage owing to the debris flow.A discrete element method is normally applied to a solid body to calculate an interaction function force with respect to the contact point between boulders and the *** numerical method initially concatenates elements that model the open Sabo ***,the stiffness coefficient of flanges and coupling joints between pipes was expressed to utilize the sectional partition method to determine the structural *** method was improved to separate from the connecting elements beyond the boundary *** debris flow model uses a water flow distribution model,and the debris flow flowed from 200m upstream of the open sabo ***,the proposed method was examined to verify the primary cause of damage to the open sabo dam and used to reproduce the circumstances that evaluated the impulsive load occurrence mechanism in the case of a real *** addition,the coupling joints between the hollow steel pipes utilized a’reproduction analysis’ for a real sabo dam and a‘reinforced analysis’ for a reinforced sabo dam were applied to assess the weak point of the dam.

关键词： Open sabo dam Site investigation Damage verification Discrete element method