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Hironori Horiguchi,Tomonori Tsukiya,Toratarou Takemika,Takeshi Nomoto,Yoshinobu Tsujimoto 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.1
In cardiopulmonary support systems with a membrane oxygenation such as a percutaneous cardiopulmonary support (PCPS) or an extracorporeal membrane oxygenation (ECMO), blood pumps need to generate the pressure rise of approximately 200mmHg or higher, due to the high hydraulic resistances of the membrane oxygenation and of the cannula tubing. In order to realize the blood pump with higher pressure rise, higher anti-hemolysis and thrombosis performances, the development of novel centrifugal blood pump composed of two-stage has been conducted by the authors. In the present paper, effective attempts to decrease the wall shear stress and to suppress the stagnation are introduced for the prevention of hemolysis and thrombosis in blood pumps. The hemolysis test was also carried out and it was clarified that the decrease of wall shear stress is effective as a guideline of design of blood pumps for improving the anti-hemolysis performance.
Two-step Growth of ZnO Nanorods by Using MOCVD and Control of Their Diameters and Surface Densities
Hironori Fujisawa,Chiaki Kobayashi,Seiji Nakashima,Masaru Shimizu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
We investigated the growth of ZnO nanorods on Al2O3(1120) substrates by using metalorganic chemical vapor deposition and demonstrated the ability to control their diameters and surface densities by using a two-step growth method. Following the first step, the ZnO nanorods were found to be densely packed due to random nucleation across the substrate surface, and their diameters and surface densities (numbers per unit area) were interdependent. During the second growth step,because nucleation sites were limited to the tips of existing nanorods, an upper limit was placed on the surface density of the second-layer nanorods. The surface density of the second-layer nanorods was also influenced by the reaction pressure during the second growth step. The diameter of the ZnO nanorods in the second layer was determined by the growth temperature during the second step and could be controlled independently of the surface density. Consequently, ZnO nanorods with small diameters (< 100 nm), low surface densities (< 10 µm−2) and large spacings (> 200 nm), which are difficult grow using a one-step growth method, were successfully produced. The deposition of 180-nm-thick Pb(Zr,Ti)O3 coatings onto sparsely-grown ZnO nanorods was also demonstrated.
29Si-NMR Study of Antiferromagnet CeRh2Si2 Using Single Crystals
Hironori Sakai,Yo Tokunaga,Shinsaku Kambe,Yuji Matsumoto,Tatsuma D. Matsuda,Yoshinori Haga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
29Si-NMR Study of antiferromagnet CeRh2Si2 with a tetragonal ThCr2Si2-type structure hasbeen performed using single crystals. The Knight shifts along the a and the c axes have beenmeasured as a function of temperatures in the paramagnetic state. At ambient pressure, the Knightshifts show the Ising-type anisotropy along the c axis, which is similar to the magnetic susceptibility. The hyperfine coupling constants for 29Si along the a and the c axes have been determined fromKnight shift versus static susceptibility plots.
Hironori Sasada 동아시아연구원 2010 Journal of East Asian Studies Vol.10 No.1
In recent years, some Japanese prime ministers have exhibited a nationalistic tendency, particularly in their foreign policies. The increasing nationalistic appeal by recent leaders marks a sharp contrast with previous leaders, who were unwilling to cause friction with other countries and thus took more centrist positions. More interestingly, those recent leaders, including Koizumi Junichiro, previously adopted a more modest stance. This article seeks to explain the increase in nationalistic appeal, particularly between 2001 and 2006, among Japanese leaders by focusing on some important changes in the Liberal Democratic Party’s (LDP’s) presidential election procedures. Drawing on the study of US primary elections, I argue that the increase in the weight of rank-and-filers’ votes vis-à-vis the LDP Diet members’ votes in the LDP presidential election encouraged some candidates to take more ideologically extreme positions. In other words, much like US primaries, the LDP presidential elections can have a tendency to pull some candidates toward extreme positions.
The Mechanism of White and Brown Adipocyte Differentiation
Hironori Nakagami 대한당뇨병학회 2013 Diabetes and Metabolism Journal Vol.37 No.2
Obesity gives vent to many diseases such as type 2 diabetes, hypertension, and hyperlipidemia, being considered as the main causes of mortality and morbidity worldwide. The pathogenesis and pathophysiology of metabolic syndrome can well be understood by studying the molecular mechanisms that control the development and function of adipose tissue. In human body, exist two types of adipose tissue, the white and the brown one, which are reported to play various roles in energy homeostasis. The major and most efficient storage of energy occurs in the form of triglycerides in white adipose tissue while brown adipose tissue actively participates in both basal and inducible energy consumption in the form of thermogenesis. Recent years have observed a rapid and greater interest towards developmental plasticity and therapeutic potential of stromal cells those isolated from adipose tissue. The adipocyte differentiation involves a couple of regulators in the white or brown adipogenesis. Peroxisome proliferators-activated receptor-γ actively participates in regulating carbohydrate and lipid metabolism, and also acts as main regulator of both white and brown adipogenesis. This review based on our recent research, seeks to highlight the adipocyte differentiation.