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Satsumasendai, Japan

Miyagi University is a public university located in Miyagi Prefecture, Japan. Established in 1997, the university has currently two campuses in Miyagi prefecture, after merging with Miyagi Agricultural College in 2005. The university is often called "MYU" or "Miya-Dai" for an abbreviation. Wikipedia.


Sugimoto S.,Tohoku University | Takahashi N.,Miyagi University | Hanawa K.,Tohoku University
Geophysical Research Letters | Year: 2013

Changes in salinity of the North Pacific subtropical mode water (STMW) were investigated using profiles for 2003-2011. In 2009 and 2010, the STMW freshened markedly (S < 34.7 psu), with salinity 0.1 psu lower than other years. Freshening in 2009 was caused by excess rainfall in the 2008 warm season, which was related to an increase in the number of low pressures passing over the STMW formation region associated with a southeastward shrinkage of the summertime North Pacific subtropical high. The freshening signal persisted under the seasonal pycnocline during the 2009 warm season. This resulted in the freshening of STMW in 2010. Key Points We investigated salinity changes using Argo float The STMW freshened markedly in 2009 and 2010 The freshening was caused by excess rainfall in the 2008 warm season ©2013. American Geophysical Union. All Rights Reserved. Source


Takahashi N.,Miyagi University
Journal of the Meteorological Society of Japan | Year: 2013

A long-term (1948-2009) frontal data set was created with an objective method by using NCEP-NCAR (National Centers for Environmental Prediction-National Center for Atmospheric Research) reanalysis data. This method utilizes a gradient and a thermal front parameter (TFP) of a potential temperature and an equivalent potential temperature at 850 hPa (dθ, TFP(θ), and TFP(θe)). The TFP defined as the directional derivative of a gradient of a thermodynamic variable along its gradient is one of the measures of frontal intensity and is often used for objectively analyzing frontal positions on surface weather maps. On the basis of the frontal data set, the average seasonal behavior of the frontal zone around Japan, its influence on the weather in mid-summer, and the seasonal march of the frontal zone during El Niño/La Niña events were examined. The main results are summarized in the following points: 1) The frontal data set generated under the conditions of dθ > 0.04 K (100 km)-1, TFP(θ) > 0.05 K (100 km)-2, and TFP(θe) > 0.69 K (100 km)-2 showed the strongest correlation to that compiled by counting the number of fronts on the surface weather maps around Japan. 2) Although the long-term frontal data set created in this study retained some differences in frequency, the seasonal march of the frontal zone was consistent with that created from fronts on the weather maps. 3) The relationship of interannual mid-summer variations (July 20-August 16) between the clear-sky ratio of Japan and the frontal zone and various mean characteristics of the Japanese climate during El Niño/La Niña events, most of which have been discussed in previous reports, were verified from the perspective of the variability in the frontal zone, which has not been clarified so far. These results of this work show that the frontal data set created herein has the advantage of being simple and objective and is useful for research on the detailed relationship in interannual variations between the regional climate around Japan and large-scale atmospheric conditions. © 2013, Meteorological Society of Japan. Source


Roy P.,University of Guelph | Tokuyasu K.,Japan National Agriculture and Food Research Organization | Orikasa T.,Miyagi University | Nakamura N.,Japan National Agriculture and Food Research Organization | Shiina T.,Japan National Agriculture and Food Research Organization
Biomass and Bioenergy | Year: 2012

Japan has set an ambitious goal to produce bioethanol from abundant biomass in views to offset some of her greenhouse gas (GHG) emissions. This study attempts to evaluate the life cycle of bioethanol produced from the most common variety of rice straw in Japan (cv. Koshihikari) by enzymatic hydrolysis. Three scenarios are established in the evaluation process. The net energy consumption, CO 2 emission and production costs are estimated to determine if environmentally friendly and economically viable bioethanol can be produced from rice straw in Japan. The net energy consumption, CO 2 emission and production costs are estimated to be 10.43-11.56GJ/m 3, 1106.34-1144.94kg/L and 88.54-137.55k¥/m 3 (1US$≈100¥), respectively depending on the scenarios of this study. This study reveals that despite a bit of environmental benefits, the economic viability is doubtful unless innovative technologies along with the renewable energy policy and stakeholders participation are considered. A shift in scenarios not only reduces the production cost, but may also minimize the risk of soil degradation and productivity loss and encourage more stakeholder participation and investment in the bioethanol industry in Japan. © 2011 Elsevier Ltd. Source


Morita K.,Food Research Institute | Shimoyamada M.,Miyagi University
Food Chemistry | Year: 2013

The mechanism underlying the freeze-thaw fractionation of 7S and 11S globulins in soymilk was investigated. Freeze-thawed soymilk demonstrated an increased particle size compared with raw soymilk. Further, when defatted raw soymilk was freeze-thawed, it was fractionated into 7S (supernatant) and 11S (precipitate) globulins, similar to what is found with freeze-thaw of raw soymilk. When raw soymilk samples with different ratios of 11S/7S were freeze-thawed, the 11S-deficient variety showed no precipitate. The addition of sodium sulphite or sodium dodecyl sulphate also inhibited precipitate formation after freeze-thawing, resulting in no fractionation. These results suggest that the fractionation is due to selective precipitation of aggregates of 11S globulins and/or 11S globulins and lipid complexes, in which the protein molecules interact through disulphide bonds and/or hydrophobic interactions. © 2013 Elsevier Ltd. All rights reserved. Source


Roy P.,University of Guelph | Orikasa T.,Miyagi University | Tokuyasu K.,Japan National Agriculture and Food Research Organization | Nakamura N.,Japan National Agriculture and Food Research Organization | Shiina T.,Japan National Agriculture and Food Research Organization
Bioresource Technology | Year: 2012

This study evaluated the life cycle of bioethanol produced by enzymatic hydrolysis of rice straw. Net energy consumption, CO 2 emission and production costs were estimated to determine whether environmentally preferable and economically viable bioethanol can be produced from rice straws. Two varieties of rice straw (Koshihikari and Leafstar), three energy scenarios (F-E-RH: Fuel-Electricity-Residues used for Heat; F-E-RE: Fuel-Electricity-Residues used to generate Electricity; F-RE: Fuel-Residues used to generate Electricity) and three types of primary energy (heavy oil; LNG: liquefied natural gas; agri-residues) were considered. The net energy consumption, CO 2 emission and production costs were estimated to be 10.0-17.6MJ/L, -0.5 to 1.6kg/L and 84.9-144.3¥/L (1 US$≈100¥), respectively, depending on the feedstock and scenarios of this study. A shift in energy scenarios or in the type of primary energy (heavy oil to LNG or agri-residues) not only reduces emissions and production costs of bioethanol from rice straw, but may also reduce the fluctuation in production cost over time and risk on investment, which would encourage more investment in this sector. © 2012 Elsevier Ltd. Source

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