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Search Results: 1 - 10 of 74 matches for " Shukuji Asakura "
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Anodic Dissolution of Spheroidal Graphite Cast Iron with Different Pearlite Areas in Sulfuric Acid Solutions
Yoshikazu Miyata,Yuki Kuwahara,Shukuji Asakura,Tadashi Shinohara,Takao Yakou,Keiichi Shiimoto
International Journal of Corrosion , 2013, DOI: 10.1155/2013/741378
Abstract: The rate equation of anodic dissolution reaction of spheroidal graphite cast iron in sulfuric acid solutions at 298?K has been studied. The cast irons have different areas of pearlite. The anodic Tafel slope of 0.043?V decade?1 and the reaction order with respect to the hydroxyl ion activity of 1 are obtained by the linear potential sweep technique. The anodic current density does not depend on the area of pearlite. There is no difference in the anodic dissolution reaction mechanisms between pure iron and spheroidal graphite cast iron. The anodic current density of the cast iron is higher than that of the pure iron. 1. Introduction Cast iron is widely used for pipes in neutral environments such as water and soil. A lot of experimental studies of cast iron for practical use were conducted [1–8]. A form of corrosion unique to cast irons is a selective leaching attack commonly referred to as graphitic corrosion [9, page 89]. A graphite network forms a corrosion-resistant phase called a graphitic layer. Therefore, the corrosion resistance of cast iron is said to be higher than that of steel. That is not necessarily the case. Laque reported that the corrosion rate of cast irons is lower than that of a steel in the atmosphere above the sea [2]. However, Paris and Bruniere [1] and Horikawa et al. [10] found that the corrosion rate of cast irons is nearly equal to that of steel in water and in atmosphere. Furthermore, a book said that graphitic corrosion does not occur in spheroidal graphite cast irons, because the graphite network does not exist [9, page 89], while another author reported that it occurs with both gray and spheroidal graphite cast irons [11]. These inconsistent results come from the complexity of graphitic corrosion. To elucidate the mechanisms of corrosion of cast iron, intensive studies are required. In this paper, the electrochemical dissolution of ferrous matrix is discussed. Cast iron is composed of pearlitic matrix, ferritic matrix, and graphite particles. The area of pearlite influences the physical properties such as tensile strength, elongation, and hardness [12]. Pearlitic matrix is a lamellar mixture of ferrite and cementite. Thus, the length of interfaces between ferrite and cementite becomes large with increasing pearlite area. Fontana [9, pages 28–31] and Trethewey and Chamberlain [13] described in their books that grain boundaries are high-energy areas and are more active chemically. The book by Evans said that regions near the grain boundaries may possess electrochemical properties different from those of the grain interiors
Qualitative Study of Wives of Husbands with Autism Spectrum Disorder: Subjective Experience of Wives from Marriage to Marital Crisis  [PDF]
Naoko Deguchi, Takashi Asakura
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.91002
Abstract: Despite increasing recognition of the involvement of adults with autism spectrum disorder (ASD) in intimate relationships, little is known about the dynamics of marriages where one partner has ASD. This study aimed to clarify the subjective experiences of wives of husbands with ASD from marriage to marital crisis. Semi-structured interviews were conducted with 15 women married to men with ASD in Japan, in 2016-17. The analysis conducted in this study was based on a modified version of the grounded theory approach. Our investigation revealed how the wives of ASD husbands respond to a crisis after their marriage. The findings describe a process beginning with wives perceiving their husbands as attractive before marriage and then progressing to feeling discomfort with their husbands and struggling with loneliness after marriage. Experiences with social exclusion/inclusion affected this progression. The wives’ repeated discomfort with their husbands and struggles with loneliness eventually led to a major crisis. Finally, the work discusses how these findings may contribute to improving the lives of women with partners with ASD and advances the family stress model.
Género y trabajo: La identidad ocupacional de las operadoras de Telmex, de Gabriel Pérez Pérez
Hiroko Asakura
El Cotidiano , 2008,
Grand challenges in the field of stem cell research
Atsushi Asakura
Frontiers in Cell and Developmental Biology , 2014, DOI: 10.3389/fcell.2014.00002
Surjectivity of $p$-adic regulator on $K_2$ of Tate curves
Masanori Asakura
Mathematics , 2005, DOI: 10.1007/s00222-005-0494-4
Abstract: I prove the surjectivity of the $p$-adic regulator from Quillen's $K_2$ of Tate curve to the $p$-adic etale cohomology group when the base field is contained in a cyclotomic extension of $Q_p$. This implies the finiteness of torsion part of $K_1$ of Tate curves thanks to Suslin's exact sequence.
On dlog image of K_2 of elliptic surface minus singular fibers
Masanori Asakura
Mathematics , 2005,
Abstract: Modular section added
Real Regulator on K_1 of elliptic surfaces
Masanori Asakura
Mathematics , 2013,
Abstract: We give a certain method for computations of real regulator on K_1 of elliptic surfaces. We also give an examples of a regulator indecomposable element for an elliptic surface with an arbitrary large p_g.
Quintic surface over $p$-adic local fields with infinite $p$-primary torsion in the Chow group of 0-cycles
Masanori Asakura
Mathematics , 2010,
Abstract: We construct a quintic surface over p-adic local fields such that there is infinite p-primary torsion in the Chow group of 0-cycles.
A formula for Beilinson's regulator map on K_1 of a fibration of curves having a totally degenerate semistable fiber
Masanori Asakura
Mathematics , 2013,
Abstract: We give a systematic method for computation of Beilinson's regulator map on K_1 of a fibration of curves which has a totally degenerate semistable fiber.
A simple construction of indecomposable higher Chow cycles in elliptic surfaces
Masanori Asakura
Mathematics , 2014,
Abstract: I construct regulator indecomposable higher Chow cycles in elliptic surfaces satisfying certain conditions. As an application I give an alternative proof of a theorem of Gordon and Lewis, which asserts that there is a real regulator indecomposable cycles in a product of general elliptic curves.
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