Meiji University is a private university in Tokyo and Kawasaki, founded in 1881 by three lawyers of the Meiji era, Kishimoto Tatsuo, Miyagi Kōzō, and Yashiro Misao. It is one of the largest and most prestigious Japanese universities in Tokyo, Japan.The University has nine faculties with total of around 33,000 students on three campuses in Ochanomizu in Chiyoda, Tokyo; the Izumi neighborhood of Suginami-ku, Tokyo; and the Ikuta neighborhood of Tama-ku, Kawasaki. The university is one of the Japanese Ministry of Education, Culture, Sports, Science and Technology's thirteen "Global 30" Project universities. Wikipedia.
Iiduka H.,Meiji University
Mathematical Programming | Year: 2014
The existing algorithms for solving the convex minimization problem over the fixed point set of a nonexpansive mapping on a Hilbert space are based on algorithmic methods, such as the steepest descent method and conjugate gradient methods, for finding a minimizer of the objective function over the whole space, and attach importance to minimizing the objective function as quickly as possible. Meanwhile, it is of practical importance to devise algorithms which converge in the fixed point set quickly because the fixed point set is the set with the constraint conditions that must be satisfied in the problem. This paper proposes an algorithm which not only minimizes the objective function quickly but also converges in the fixed point set much faster than the existing algorithms and proves that the algorithm with diminishing step-size sequences strongly converges to the solution to the convex minimization problem. We also analyze the proposed algorithm with each of the Fletcher–Reeves, Polak–Ribiére–Polyak, Hestenes–Stiefel, and Dai–Yuan formulas used in the conventional conjugate gradient methods, and show that there is an inconvenient possibility that their algorithms may not converge to the solution to the convex minimization problem. We numerically compare the proposed algorithm with the existing algorithms and show its effectiveness and fast convergence. © 2014, Springer-Verlag Berlin Heidelberg and Mathematical Optimization Society. Source
Kusunoki M.,Meiji University
Journal of Photochemistry and Photobiology B: Biology | Year: 2011
Photosynthetic water oxidation reaction driven by Sun and catalyzed by a unique Mn4Ca cluster in Photosystem II (PSII) is known to take place in an oxygen evolving complex (OEC) that cycles five serial redox states, named "Kok's Si-states" (i = 0-4). Recently, the atomic crystal structure of PSII from Thermosynechococcus vulcanus was resolved by 1.9 -resolution XRD data . Interestingly, it revealed an unusual oxo-bridged Mn4CaO5 cluster in the dark stable S1-state, e.g. unusual mono-μ2-oxo-mono-μ4-oxo-mono- μ2-carboxylato bridges connecting Mna (terminal) and Mnb (central) ions with unusual atomic distance of 2.9 . Using the UDFT/B3LYP/lacvp geometry optimization method and a truncated cluster model of the chemically-complete OEC put in = 4 dielectric medium, it is shown that the OEC in S1 must be in thermal equilibrium between the most-stable isomeric substates ("S1a and S1b") owing to the quasi-reversible structure change induced by proton migration. Coincidentally, it is found that the Mna-Mnb distances in the Mn 4Ca clusters in S1a and S1b are given by R ab = 3.32 and 2.77 , respectively, so that the apparent distance between Mna and Mnb ions in isomeric equilibrium is given by 2.94 , in agreement with experimental Rab ∼ 2.9 . Concomitantly, the first full-k-range EXAFS spectrum from powdered PSII  is used to provide the second experimental evidence for the S1-state OEC being in thermal equilibrium between S1a and S1b-isomers. These OEC-isomers consist of all the chemically-essential 11 amino acid residues, six cofactor ions and nine essential hydrated water molecules in their chemical ionic states around physiological pH 7, thus reasonably satisfying the biochemical charge neutrality with four Mn ions staying at the oxidation states (MnaIII/MnbIV/MncIII/MndIV) with the skeleton structures of MT-5J type and T-shaped DD-4J type. These H-bonding water molecules are found to fill a cavity connecting possible substrate/products channels so as to be arranged as an indispensable part of the catalytic Mn4Ca cluster in the order of "current-substrates" (W1/W2 bound to MnaIII), "next- substrates" (W4/W7) and "next-after-next-substrates" (W5/W6 bound to Ca2+). Results show that the Jahn-Teller effect due to MnaIII ion in these isomers can reasonably explain the very-slow-exchange and very-fast-exchange processes observed in S1 by time-resolved 18O-exchange mass spectroscopy. © 2011 Elsevier B.V. All rights reserved. Source
Shadrina E.,Meiji University
Energy Policy | Year: 2014
The article examines the institutional dimensions of Russia's gas policy toward Northeast Asia (NEA 1 During the liberal economic reforms of the 1990s, development of natural gas deposits in the Russian Far East was made possible under the scheme of production sharing agreements (PSA). However, new PSAs were banned in Russia even before the advent of state capitalism in the early 2000s. This was, to a large extent, the result of strong anti-PSA lobbying led by the domestic energy business elite. Consequently, Russia's gas policy in the east began evolving from being project-specific toward being region-specific. Contemporary Russian gas policy toward NEA relies upon domestic (national and regional) and external institutions. In 2009, following the completion of a liquefied natural gas (LNG) plant in Sakhalin, Russia entered NEA gas markets. Transformations in the international gas markets facilitated the establishment of a two-pattern gas export policy in Russia in 2013. Under this policy, Russia's EU-oriented pipeline gas export remains monopolised by Gazprom, while Asia-oriented LNG export is partially liberalised. Russia has not been experiencing institutional discrepancy in NEA gas markets. However, as the markets evolve toward greater coordination, a rational option for Russia is to genuinely liberalise its gas policy. © 2014 Elsevier Ltd. Source
Meiji University | Date: 2010-05-13
Spinel-type ferrimagnetic particles having a composition represented by the formula: where M is a divalent metal and n is a molar ratio of Fe to M (n=Fe/M) which is from more than 2.05 to less than 2.5 (2.05
Meiji University and Showa Ika Kohgyo Ltd. | Date: 2010-09-14
The present invention provides a calcium phosphate/biodegradable polymer hybrid material with high strength prepared by complexing a calcium phosphate porous material and a biodegradable polymer having a average molecular weight of 50,000 to 500,000, an implant comprising the hybrid material, and a method for producing a calcium phosphate/biodegradable polymer hybrid material prepared by immersing the calcium phosphate porous material within a solution including a biodegradable polymer and performing an ultrasonic treatment or a suction treatment.