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Yokkaichi, Japan

Yokkaichi University is a private university in Yokkaichi, Mie, Japan. The predecessor of the school, women's school, was founded in 1946, and it was chartered as a university in 1988. Wikipedia.

Oyagi M.,Yokkaichi University | Nobori M.,Aichi Institute of Technology | Ssuda H.,Aichi Institute of Technology | Yokoyama A.,ET Water Inc | Yagi A.,Aichi Institute of Technology
International Journal of GEOMATE | Year: 2016

Changes in depth and decrease of the sediment rate before and after a building breakhead maintenance construction were studied in small monomictic and eutrophic Lake Fukami-ike in central Japan. The maintenance of farm village drainage and the waterfront function was carried out for the activation of the town in 1992, and the water quality improvement was expected. However, variations of transparency were observed and no blue-green algal bloom outbreak had occurred before recently observed. Maximum depth changed from 9.3 m (1951), 8.5 m (1979), 8.1 cm (1992) to 7.8 m (2012), respectively. Changes in the autochthonous and allochthonous matters in the lake were thus considered. Sediment rates of 19.5 ∓ 10.19 gm-2d-1 (1978 to 1979) and 4.40 ∓ 2.27 gm-2d-1 (2007 to 2008) were observed, and decreased 22.6%. These deposition rate data corresponded to 3.1 cm year-1 (1979) and 1.2 cmyear-1 (2009), respectively. The decreased percentage of organic matter and the reduced deposition rate were because rice fields and forest around the lake give way to take concrete roads. It was considered to be because the inflow of sediment stopped when it rained, and allochthonous inorganic matter was significantly reduced. © 2016, Int. J. of GEOMATE. Source

Suda H.,Aichi Institute of Technology | Tanaka M.,Yokkaichi University | Nobori M.,Aichi Institute of Technology | Yagi A.,Aichi Institute of Technology
International Journal of GEOMATE | Year: 2016

Lake Fukami-ike is a small monomictic and eutrophic lake, located in southern Nagano Prefecture in Central Japan. An uncommon phenomenon of dissolved oxygen 0-1 mgL-1 from the surface to the bottom layer occurred on 16 November, 2013. On November 2, Trichocerca similis (Rotatoria) etc. dominantly distributed from 0-5 m depth depending on distribution DO concentration. Tintinnopsis lacustris (Protozoa) was found in the bottom layer (anoxic condition). The number of cells (Fragilaria rumpens (Bacillariophyceae) etc. abounded from the 0-5 m layer. On November 16, T. lacustris distributed from the surface to the bottom layer. Then, T. lacustris continued to distribute from the surface to the bottom layer, and the genus Synedra was found to have distributed uniformly from the surface to 6 m depth in the next investigation on 21 December, when the DO concentration was about 10 mgL-1 from the surface to the bottom layer. The changes in vertical distribution of T. lacustris, seemed to indicate that lake water was lifted from the bottom layer when shift stagnation periods to circulation periods. © 2015, Int. J. of GEOMATE. All rights reserved. Source

Sakai Y.,Kogakuin University | Nakano S.,Keio University | Wang C.,Tianjin University of Science and Technology | Kito H.,Yokkaichi University
Journal of Chemical Engineering of Japan | Year: 2015

Environmental and health problems due to sulfur dioxide (SO2) emission are serious issues in China. In this study, we developed a model to assess the total economic and environmental impact on an area subsequent to installation of desulfurization facilities. A model based on the number of new patients with respiratory illness in Shenyang City, China and the corresponding environmental SO2 concentration was first constructed and subsequently integrated into an air diffusion model for SO2. Changes in the SO2 concentration and the number of patients were then simulated, and the effects of desulfurization by-products on salt-affected soil amelioration were assessed in a number of scenarios where desulfurization facilities were installed in combustion plants. From the data, it is projected that the introduction of a wet limestone– gypsum process in large plants, an integrated desulfurization and water-film dust collection process in medium- and small-scale plants, and coal bio-briquettes in households should result in SO2 concentrations below the stipulated SO2 limit for urban residential areas in China. Moreover, a large decrease in the number of new patients and in the total number of patients at the year-end was forecasted for the years following the introduction of these facilities. Additionally, the present findings indicate that amelioration of salt-affected soil using desulfurization by-products is a prospectively effective method for increasing corn and rice production for potential alleviation of food shortages in China. © 2015 The Society of Chemical Engineers, Japan. Source

Sakai Y.,Kogakuin University | Nakano S.,Keio University | Kito H.,Yokkaichi University
Journal of Chemical Engineering of Japan | Year: 2011

With the aim of alleviating the problems of air pollution, soil desertification, and food shortages in China, we have studied the impact of reclamation of alkali soil using the by-products of flue gas desulfurization (FGD). We have developed an evaluation model for assessing the complete economic and environmental impact of the introduction of environmental improvement technologies. The model consists of an economic model based on an input-output table for China and a soil reclamation model. In the context of the introduction of FGD equipment, we are able to calculate the associated changes in economic variables such as real GDP, average wage, labor supply, domestic electricity price, real investment other than for desulfurization equipment, investment in construction, SO2 emissions in provinces and cities, area of reclaimed alkali soil, and corn and rice production. We simulated the introduction of the wet limestone-gypsum process and/or the integrated desulfurization and water-film dust collection process. The results confirm a reduction in SO2 emissions and increases in GDP, domestic electricity price, and agricultural production following soil reclamation via the application of desulfurization by-products. In summary, our results confirm the effectiveness of these desulfurization technologies in terms of improving the economy and environment in China. © 2011 The Society of Chemical Engineers, Japan. Source

Makita N.,Yokkaichi University | Yoshikawa Y.,Ritsumeikan University | Takenaka Y.,RIKEN | Sakaue T.,Kyushu University | And 7 more authors.
Journal of Physical Chemistry B | Year: 2011

We observed single DNA molecules by fluorescence microscopy to clarify the effect of protamine on their higher-order structure. With an increase in the protamine concentration, the conformation of DNA molecules changes from an elongated coil state to a compact state through an intermediate state. Furthermore, the long-axis length of DNA gradually decreases while maintaining a distribution profile with a single peak. Such behavior is markedly different from the conformational transition of DNA induced by small polyamines such as spermidine and spermine, where individual DNA molecules exhibit an all-or-none transition from a coil to a globule state and the size distribution is characterized by twin peaks around the transition region. Next, we examined the effect of salt on the conformation of the DNA-protamine complex. Interestingly, at a fixed concentration of protamine, DNA tends to shrink with an increase in the NaCl concentration up to 300 mM, and then swells with a further increase in the NaCl concentration, that is, biphasic behavior is generated depending on the salt concentration. For comparison, we examined the effect of salt on DNA compaction induced by the trivalent polyamine spermidine. We confirmed that salt always has an inhibitory effect on spermine-induced compaction. To clarify this biphasic effect of salt on protamine-induced DNA compaction, we performed a numerical simulation on a negatively charged semiflexible polyelectrolyte in the presence of polycations with relatively large numbers of positive charges by taking into account the effect of salt at different concentrations. The results showed that salt promotes compaction up to a certain concentration and then tends to unfold the polyelectrolyte chain, which reproduced the experimental observation in a semiquantitative manner. This biphasic effect is discussed in relation to the specific shielding effect that depends on the salt concentration. © 2011 American Chemical Society. Source

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