Iwaki, Japan

Iwaki Meisei University is a Private university, located in the city of Iwaki, Fukushima, Japan. Wikipedia.

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Oyama H.T.,Rikkyo University | Sekikawa M.,Rikkyo University | Shida S.,Iwaki Meisei University
Polymer Degradation and Stability | Year: 2012

In the present study the highly flammable nature of isotactic polypropylene (iPP) is suppressed by incorporating the inorganic flame retardant filler, magnesium hydroxide (MH), and the flame-retardant polymer, poly(2,6-dimethyl-1, 4-phenylene ether) (PPE). In the iPP/PPE/MH composite, the MH is selectively dispersed in the PPE domain with the average domain size about 1.5 μm. However, upon addition of polystyrene-block-poly(ethylene-co-butylene)-block- polystyrene (SEBS), the MH moves to the SEBS phase located at the interface between iPP and PPE, whereas the domain size of PPE was drastically reduced to less than 0.3 μm and the domains tended to form aggregates. It was demonstrated that interface modification by dodecanoic acid as a surface treatment reagent for MH and by SEBS as a compatibilizer between iPP and PPE significantly improves the macroscopic mechanical and thermal properties of the composites in a synergetic manner. Cone calorimetry tests revealed that incorporation of PPE and SEBS drastically reduces the peak heat release rate and that PPE facilitates char formation, which serves as a physical barrier for heat flux from the flame to the polymer surface, as well as a diffusion barrier for gas transport to the flame. The idealized mechanism of flame retardancy is also proposed for the iPP/PPE/MH composites. © 2012 Elsevier Ltd. All rights reserved.

Takahashi M.,Training Institute for Correctional Personnel | Mori T.,Iwaki Meisei University | Kroner D.G.,Southern Illinois University Carbondale
Law and Human Behavior | Year: 2013

The main purpose of the current research is to examine the applicability of the Youth Level of Service/Case Management Inventory (YLS/CMI) in a Japanese juvenile offender population. Three hundred eighty-nine youths who were released from the five Juvenile Classification Homes were followed for approximately one and half years. Results show that the YLS/CMI total score significantly predict recidivism. Survival time analysis demonstrates that the YLS/CMI total score also significantly predicted faster time to recidivism. The overall findings support adequate predictive validity of the YLS/CMI total score, but subscales lacked content representativeness and predictive validity in this sample. Canadian and Japanese cultural differences in criminal history and substance abuse are contributors to the lack of content representativeness. © 2013 American Psychological Association.

Fukunaga M.,Nihon University | Shimizu N.,Iwaki Meisei University
Journal of Computational and Nonlinear Dynamics | Year: 2011

Two types of models are proposed for describing nonlinear fractional derivative dynamical behavior of viscoelastic materials subject to impulse forces. The models are derived based on the thermodynamic elasticity in terms of entropy and on the "scale-free response of the material" under the basic assumption that the viscoelastic materials consist of stable coils of polymers, which we refer to as blobs. The blobs, which may be connected to each other by chemical bonds or physical bonds, are considered here as the elementary constituent of viscoelastic materials from which the nonlinear fractional derivative models are derived. Responses of individual blobs can determine the net collective response of the viscoelastic material to impulse forces. From the above consideration, two types of models are proposed in which the force elements or the stress elements are connected by the generalized Maxwell law. © 2011 American Society of Mechanical Engineers.

Akasaka R.,Kyushu Sangyo University | Tanaka K.,Nihon University | Higashi Y.,Iwaki Meisei University
International Journal of Refrigeration | Year: 2013

The vapor-liquid coexistence curves near the critical point of the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) were measured by means of the visual observation of meniscus disappearance. Eleven, eighteen, and eleven saturated densities were obtained for mixtures with 50.00 mass%, 80.01 mass%, and 90.00 mass% of R-1234yf, respectively. The critical temperatures, critical densities, and critical molar volumes of the mixtures were determined from the meniscus disappearing level and the intensity of the critical opalescence. The critical pressures of the mixtures were also determined from the analysis of pρTx measurements. The composition dependence of the critical parameters was formulated with simple correlations. © 2013 Elsevier Ltd and IIR. All rights reserved.

Fukunaga M.,Nihon University | Shimizu N.,Iwaki Meisei University
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2013

A high-speed algorithm for computing fractional differentiations and fractional integrations in fractional differential equations is proposed. In this algorithm, the stored data are not the function to be differentiated or integrated but the weighted integrals of the function. The intervals of integration for the memory can be increased without loss of accuracy as the computing time-step n increases. The computing cost varies as n log n, as opposed to n2 of standard algorithms. © 2013 The Author(s) Published by the Royal Society. All rights reserved.

Tanaka K.,Iwaki Meisei University | Higashi Y.,Iwaki Meisei University
Journal of Chemical and Engineering Data | Year: 2010

Measurements of the PpT properties for trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in the gaseous phase were carried out using metal bellows volumometer. A total of 204 PpT property values was obtained in the range of temperatures from (310 to 360) K, pressures from (657 to 2300) kPa, and densities from (34 to 146) kg•m-3. The sample purity was better than 99.96 % in mole fraction. The present data were compared with the existing data and equations of state. The Benedict-Webb-Rubin-Starling (BWRS) and Martin-Hou equations of state were used to correlate the present data. © 2010 American Chemical Society.

Ohno-Iwashita Y.,Iwaki Meisei University
Sub-Cellular Biochemistry | Year: 2010

Cholesterol is one of the major constituents of mammalian cell membranes. It plays an indispensable role in regulating the structure and function of cell membranes and affects the pathology of various diseases. In recent decades much attention has been paid to the existence of membrane microdomains, generally termed lipid “rafts”, and cholesterol, along with sphingolipids, is thought to play a critical role in raft structural organization and function. Cholesterolbinding probes are likely to provide useful tools for analyzing the distribution and dynamics of membrane cholesterol, as a structural element of raft microdomains, and elsewhere within the cell. Among the probes, non-toxic derivatives of perfringolysin O, a cholesterol-binding cytolysin, bind cholesterol in a concentrationdependent fashion with a strict threshold. They selectively recognize cholesterol in cholesterol-enriched membranes, and have been used in many studies to detect microdomains in plasma and intracellular membranes. Anti-cholesterol antibodies that recognize cholesterol in domain structures have been developed in recent years. In this chapter, we describe the characteristics of these cholesterolbinding proteins and their applications to studies on membrane cholesterol localization. © Springer Science+Business Media B.V. 2010.

Eguchi M.,Kitasato University | Kikuchi Y.,Kitasato University | Kikuchi Y.,Iwaki Meisei University
Journal of Infectious Diseases | Year: 2010

Background. Most antigens from intracellular bacteria or vaccines induce both humoral and cell-mediated immune responses, but interactions between these responses are not fully understood. This study aims to resolve how specific antibodies participate in the activation of specific T cells in protecting hosts against Salmonella enterica serotype Typhimurium (S, typhimurium) infection. Methods. Mice were administered anti-Salmonella immunoglobulin G (IgG) 1 day before Salmonella infection, and survival rate was observed. For in vitro assay, Salmonella bacteria were treated with anti- Salmonella IgG or control IgG before infection of the RAW264.7 or HEp2 cells. After infection, cell-associated bacteria number, induction of apoptosis, and production of nitric oxide were examined. In addition, antigen presentation assays using Salmonella-primed T cells were performed. Results. Treatment of S. typhimurium with anti- Salmonella IgG enhanced the macrophages' uptake of bacteria and induced high-frequency apoptotic cell death. In vitro antigen presentation assay revealed that the extracellular vesicles isolated from apoptotic cells caused by infection with anti- Salmonella IgG-treated S. typhimurium facilitated the responses of Salmonella-specific T cells. Conclusion. Our findings suggest that humoral immunity cooperates with cell-mediated immunity upon induction of apoptosis in host cells to establish protective immunity against Salmonella infection, even if it does not directly eliminate intracellular microorganisms. © 2010 by the Infectious Diseases Society of America. All rights reserved.

Akasaka R.,Kyushu Lutheran College | Tanaka K.,Iwaki Meisei University | Higashi Y.,Iwaki Meisei University
International Journal of Refrigeration | Year: 2010

This paper presents a timely and reliable equation of state for 2,3,3,3-tetrafluoropropene (HFO-1234yf) whose thermodynamic property information is strongly desired. The Patel-Teja (PT) equation of state and the extended corresponding state (ECS) model have been individually applied to property modeling for this new refrigerant. Comparisons of predicted values with the equation/model were made with the most recent experimental data. Both the PT equation of state and the ECS model can represent the vapor pressures with an accuracy of 0.2%. However, the ECS model is much better than the PT equation of state in the predictions for the liquid density and isobaric heat capacity. The uncertainties of calculated values with the ECS model are 0.5% in liquid density and 2.5% in isobaric heat capacity. The use of the ECS model is recommended for a detailed assessment of HFO-1234yf. Thermodynamic property tables and diagrams generated using the ECS model are provided. © 2009 Elsevier Ltd and IIR.

Tanaka K.,Iwaki Meisei University | Higashi Y.,Iwaki Meisei University
International Journal of Refrigeration | Year: 2010

Measurements of the thermodynamic properties of HFO-1234yf were conducted. The critical temperature TC, critical density ρC, and critical pressure PC, were measured by the visual observation of the meniscus disappearance, and were determined to be 367.85 ± 0.01 K, 478 ± 3 kg/m3, and 3382 ± 3 kPa, respectively. Vapor pressures were measured by a batch-type calorimeter with a metal-bellows in the temperature range from 310 K to 360 K and correlated by the Wagner-type equation. Surface tensions were measured by the differential capillary-rise method in the temperature range from 273 K to 340 K and correlated by the van der-Waals type equation. The acentric factor was determined to be 0.280 with the vapor pressure correlation. Based on the critical parameters and acentric factor, saturated vapor and liquid densities were estimated by the Peng-Robinson equation and the Hankinson-Thomson equation, respectively. The heat of vaporization was also calculated from the Clausius-Clapeyron equation. © 2009 Elsevier Ltd and IIR.

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