Toyohashi Institute of Technology

Toyohashi, Japan

Toyohashi Institute of Technology

Toyohashi, Japan
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Kajino M.,Japan Meteorological Agency | Kajino M.,Pacific Northwest National Laboratory | Inomata Y.,Asia Center for Air Pollution Research | Sato K.,Asia Center for Air Pollution Research | And 11 more authors.
Atmospheric Chemistry and Physics | Year: 2012

A new aerosol chemical transport model, the Regional Air Quality Model 2 (RAQM2), was developed to simulate the Asian air quality. We implemented a simple version of a triple-moment modal aerosol dynamics model (MADMS) and achieved a completely dynamic (non-equilibrium) solution of a gas-to-particle mass transfer over a wide range of aerosol diameters from 1 nm to super-μm. To consider a variety of atmospheric aerosol properties, a category approach was utilized in which the aerosols were distributed into four categories: particles in the Aitken mode (ATK), soot-free particles in the accumulation mode (ACM), soot aggregates (AGR), and particles in the coarse mode (COR). The aerosol size distribution in each category is characterized by a single mode. The condensation, evaporation, and Brownian coagulations for each mode were solved dynamically. A regional-scale simulation (Δx Combining double low line 60 km) was performed for the entire year of 2006 covering the Northeast Asian region. The modeled PM1/bulk ratios of the chemical components were consistent with observations, indicating that the simulated aerosol mixing types were consistent with those in nature. The non-sea-salt SO4 2- mixed with ATK + ACM was the largest at Hedo in summer, whereas the SOSO 4 2- was substantially mixed with AGR in the cold seasons. Ninety-eight percent of the modeled NO3 - was mixed with sea salt at Hedo, whereas 53.7% of the NO3 - was mixed with sea salt at Gosan, which is located upwind toward the Asian continent. The condensation of HNO3 onto sea salt particles during transport over the ocean accounts for the difference in the NO3 - mixing type at the two sites. Because the aerosol mixing type alters the optical properties and cloud condensation nuclei activity, its accurate prediction and evaluation are indispensable for aerosol-cloud-radiation interaction studies. © Author(s) 2012.


Shibasaki I.,Toyohashi Institute of Technology | Shibasaki I.,Noguchi Institute | Kuriyama K.,Chiyoda Corporation | Makino T.,Chiyoda Corporation | And 2 more authors.
IEEJ Transactions on Sensors and Micromachines | Year: 2013

By electrically connecting and placing an InAs deep quantum well (DQW) Hall element as a magnetic sensor chip and a Si IC linear amplifier in a small plastic package, a very small sized InAs DQW linear hybrid Hall IC (InAs DQW LHHIC) with a high magnetic field sensitivity was developed. The output voltage of the hybrid Hall IC showed a very small temperature coefficient of 0.02%/°C and the response time was very small at less than 3μsec. By using this InAs DQW LHHIC, practical current sensors having high sensitivity, high accuracy, and temperature stability were developed. © 2013 The Institute of Electrical Engineers of Japan.


Kajino M.,Japan Meteorological Agency | Kajino M.,Pacific Northwest National Laboratory | Deushi M.,Japan Meteorological Agency | Maki T.,Japan Meteorological Agency | And 5 more authors.
Geoscientific Model Development | Year: 2012

We conducted a regional-scale simulation over Northeast Asia for the year 2006 using an aerosol chemical transport model, with time-varying lateral and upper boundary concentrations of gaseous species predicted by a global stratospheric and tropospheric chemistry-climate model. The present one-way nested global-through-regional-scale model is named the Meteorological Research Institute-Passive-tracers Model system for atmospheric Chemistry (MRI-PM/c). We evaluated the model's performance with respect to the major anthropogenic and natural inorganic components, SO4 2-, NH4 +, NO3-, Na+ and Ca2+ in the air, rain and snow measured at the Acid Deposition Monitoring Network in East Asia (EANET) stations. Statistical analysis showed that approximately 40-50 % and 70-80 % of simulated concentration and wet deposition of SO4 2-, NH4 +, NO3-and Ca2+ are within factors of 2 and 5 of the observations, respectively. The prediction of the sea-salt originated component Na+ was not successful at near-coastal stations (where the distance from the coast ranged from 150 to 700 m), because the model grid resolution (Δx = 60 km) is too coarse to resolve it. The simulated Na+ in precipitation was significantly underestimated by up to a factor of 30. © Author(s) 2012.


Shibasaki I.,Toyohashi Institute of Technology | Shibasaki I.,Noguchi Institute | Kuriyama K.,Asahi Kasei Corporation | Makino T.,Asahi Kasei Corporation | And 2 more authors.
Electronics and Communications in Japan | Year: 2015

By electrically connecting and placing an InAs deep quantum well (DQW) Hall element as a magnetic sensor chip and an Si IC linear amplifier in a small plastic package, a very small InAs DQW linear hybrid Hall IC (InAs DQW LHHIC) with a high magnetic field sensitivity has been developed. The output voltage of the hybrid Hall IC showed a very small temperature coefficient of 0.02%/C and the response time was very low, less than 3 μs. By using this InAs DQW LHHIC, practical current sensors with high sensitivity, high accuracy, and temperature stability have been developed. © 2015 Wiley Periodicals, Inc.


Major Z.,Johannes Kepler University | Miron M.,Johannes Kepler University | Reiter M.,Johannes Kepler University | Adachi T.,Toyohashi Institute of Technology
19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 | Year: 2012

The failure behavior of short fiber reinforced injection molded thermoplastic polymer matrix components is of prime practical importance for many demanding engineering applications (e.g. automotive). Based on an existing injection molded specimen, which includes weld line, various fracture specimen configurations were developed and implemented in this study. The fracture behavior of these specimens was modeled by various FE methods, considering the specific behavior of an injection molded weld line in short fiber reinforced polymer composites.


Kajino M.,Meteorological Research Institute | Sato K.,Asia Center for Air Pollution Research | Inomata Y.,Asia Center for Air Pollution Research | Ueda H.,Toyohashi Institute of Technology
Atmospheric Environment | Year: 2013

We conducted a source-receptor relationship (SRR) analysis of the total deposition of nitrate (TDN; dry+wet, gas+aerosol) in Northeast Asia using an aerosol chemical transport model. Six regions were included in the study: North China, Central China, South China, South Korea, Japan, and Ocean. More than 95% of the TDN across China consisted of contributions from Chinese emissions. The largest intra-regional contributions and the second largest contributions were attributed to the Central China region. The contribution of the three China regions accounted for approximately 50-60% of the TDN in South Korea and Japan and 75% of the TDN in the Ocean region, respectively. The spatial distributions of the SRR indicated that the sub-regional high was more than twice the regional averages of the TDN. We also investigated the effects of sea salt on the transport and deposition of nitrate. During the long-range transport from the Asian continent over the ocean, nitric acid gas condenses on sea-salt particles to form NaNO3. The presence of sea-salt particles increased the TDN over the downwind regions of the Asian continent by approximately 10-25% in South Korea and Japan and by up to 40% in the Ocean region. However, the sea-salt effects on the SRR of the TDN were small (the absolute differences were smaller than approximately 10%). © 2013 Elsevier Ltd.


Kajino M.,Tokyo University of Science | Kajino M.,Japan Meteorological Agency | Ueda H.,Toyohashi Institute of Technology | Sato K.,Asia Center for Air Pollution Research | Sakurai T.,Japan NUS Co.
Atmospheric Chemistry and Physics | Year: 2011

The spatial distribution of the source-receptor relationship (SRR) of sulfur over Northeast Asia was examined using a chemical transport model (RAQM) off-line coupled with a meteorological model (MM5). The simulation was conducted for the entire year of 2002. The results were evaluated using monitoring data for six remote stations of the Acid Deposition Monitoring Network in East Asia (EANET). The modeled SO2 and O3 concentrations agreed well with the observations quantitatively. The modeled aerosol and wet deposition fluxes of SO42− were underestimated by 30 % and 50 %, respectively. The domain was divided into 5 source-receptor regions: (I) North China; (II) Central China; (III) South China; (IV) South Korea; and (V) Japan. The sulfur deposition in each receptor region amounted to about 50ĝ€"75 % of the emissions from the same region. The largest contribution to the deposition in each region was originated from the same region, accounting for 53ĝ€"84 %. The second largest contribution was due to Region II, supplying 14ĝ€"43 %. The spatial distributions of the SRRs revealed that subregional values varied by about two times more than regional averages due to nonuniformity across the deposition fields. Examining the spatial distributions of the deposition fields was important for identifying subregional areas where the deposition was highest within a receptor region. The horizontal distribution changed substantially according to season. © 2011 Author(s).


Nagai M.,Toyohashi Institute of Technology | Tanizaki K.,Toyohashi Institute of Technology | Kawashima T.,Toyohashi Institute of Technology | Shibata T.,Toyohashi Institute of Technology
Electronics and Communications in Japan | Year: 2016

Bioactuators, biological motors in living systems, are promising for integration and functionalization of microsystems. We have developed a Ca2+-driven microvalve powered by a contractile fiber, a stalk of Vorticella. Cells of Vorticella convallaria were trapped in designed microchambers. Stalks were self-grown in the chambers and their reversible linear actuations were controlled by regulating the concentration of Ca2+. A cell body, connected to a stalk, opened and closed a microchannel by the contraction and extension of the stalk. The flow field in the chamber was characterized to further optimize the actuation performance. © 2016 Wiley Periodicals, Inc.


Ueda H.,Toyohashi Institute of Technology | Fukui T.,Institute of Behavioral science | Kajino M.,Meteorological Research Institute | Horiguchi M.,Kyoto University | And 2 more authors.
Journal of the Atmospheric Sciences | Year: 2012

Recently, middle- and upper-atmosphere Doppler radar (MU radar) has enabled the measurement of middle-atmosphere turbulence from radar backscatter Doppler spectra. In this work, eddy diffusivities for momentum K m in the upper troposphere and lower stratosphere during clear-air conditions were derived from direct measurements of the Reynolds stress and vertical gradient of mean wind velocity measured by MU radar. Eddy diffusivity for heat K h below8 km was determined from measurements of temperature fluctuations by the Radio Acoustic Sounding System (RASS) attached to the MU radar. The eddy diffusivity for momentum was on the order of 10 m 2 s -1 in the upper troposphere and decreased gradually in the stratosphere by an order of magnitude or more. The eddy diffusivity for heat was almost of the same order of magnitude as K m. Estimates of eddy diffusivity from the radar echo power spectral width give fairly good values compared with the direct measurement of K m. Applicability of three turbulence models-the spectral width method, the k-ε model modified for stratified flows, and the algebraic stress model-were also examined, using radar observation values of turbulent kinetic energy k and turbulent energy dissipation rate ε together with atmospheric stability observations from rawinsonde data. It is concluded that the algebraic stress model shows the best fit with the direct measurement of K m, even in the free atmosphere above the atmospheric boundary layer once k and ε values are obtained from observations or a model. © 2012 American Meteorological Society.


Sugano S.,Japan Building Research Institute | Saito T.,Toyohashi Institute of Technology | Zavala C.,Centro Peruano Japones Of Investigaciones Sismicas Y Mitigacion Of Desastres Cismid | Cardenas L.,Centro Peruano Japones Of Investigaciones Sismicas Y Mitigacion Of Desastres Cismid
Journal of Disaster Research | Year: 2014

The Japanese and Peruvian experimental databases on confined brick masonry walls are put together as one database, and the strength and deformation of the walls are reviewed. First, the applicability of existing equations for the ultimate strength of reinforced concrete or reinforced masonry walls to the estimation of the maximum strength of confined brick masonry walls which failed in shear, flexural-shear, or flexure when subjected to lateral forces, is discussed. Then, empirical equations for the maximum strength, displacement at maximum strength, and ultimate state of the walls are proposed based on multiple regression analysis, and the accuracy of the proposed equations is discussed. It is concluded that the maximum strength can be estimated using the existing equations or the proposed empirical equations with good accuracy. The deformations at maximum strength and the ultimate state can be estimated using the proposed empirical equations, although there is a large amount of scatter. © 2014 Fuji Technology Press. All rights reserved.

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