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Search Results: 1 - 10 of 455 matches for " Hidetoshi Naganawa "
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MASTER AND PUPIL – DR. JáN BRTEK AND I
Hidetoshi NAGANAWA
Lakes reservoirs and ponds , 2008,
Abstract: Large branchiopod studies were born and bred in the Danube basin in some Eastern European countries (the former Czechoslovakia, Hungary, and Romania). The leading expert was the late Dr. Ján Brtek in Slovakia. Large branchiopods are usually habitants of such temporary lakes and ponds as inland bodies of fresh, mineralized, salt water or hypersaline. This article has two distinct goals: (1) to review the history of large branchiopod studies and (2) to draw attention to some of the scientific interest and value of ephemeral aquatic habitats, introducing my reminiscences of Dr. Brtek.
LAKE GUSINOE TO BAIKAL VIA SELENGA DELTA: PROTECTION-DESTRUCTION SPIRAL
Hidetoshi Naganawa
Lakes reservoirs and ponds , 2012,
Abstract: Lake Gusinoe is the largest water body in the Buryat Republic (South Siberia, Russia) and still the only source of both drinking and industrial water supply. All the wastewater is thrown away into the same lake. Most of the tributaries, concentrated on the western lakeshore, disappear into the coarse deposits of alluvial fans soon after they emerge from the mountains. Anthropogenic impacts on the lake ecosystem increased during the 20th century. The biggest environmental polluters are the Gusinoozersk coal mine, the Kholboldzhinsky opencut coal mine, and the Gusinoozersk State Regional Power Plant (Gusinoozersk SRPP). The Gusinoozersk SRPP takes a large amount of freshwater from the Zagustai River, the longest influent of Lake Gusinoe, to produce hot water and steam for the turbines. The warm wastewater is discharged back into the lake. As a result of this, an unfrozen patch of water measuring about 2 km2 is formed on the lake in winter, and the water temperature in the upper layer is 13–14°C higher than the lower ones. Some chemical components (e.g., sulfate, phenol, iron ions) of both the lake water and surface/groundwater of the Lake Gusinoe Basin are with constant excess of the maximum allowable concentration (MAC). The Gusinoozersk SRPP is also the main air polluter. Now Lake Gusinoe is constantly polluted and in the state of degradation. Lake Gusinoe might be possible one of the largest pollution sources in the Baikal region, because the connecting transboundary Selenga River is the main inflow of Lake Baikal
Development of an Ultrasonic Motor That Uses an Inchworm Shaped Deformation of a Metallic Plate  [PDF]
Akihiro Naganawa, Kazumi Komatsu, Hisashi Ito
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43D013
Abstract:
At the present time, ultrasonic motors have been developed for a variety of purposes such as linear motion drives and rotational drives. The elaboration of an ultrasonic motor is time-consuming, because it is developed adapting on its application. In this study, a new ultrasonic motor structure that combines a piezoelectric element and a metallic plate is elaborated. The driving principle of this motor is that the metal plate is bent to an inchworm shape and rotates the rotor when the piezoelectric element is stretched. The objective of this study is to verify the functioning of the new motor experimentally.
On the Exact Solution of a Generalized Polya Process
Hidetoshi Konno
Advances in Mathematical Physics , 2010, DOI: 10.1155/2010/504267
Abstract: There are two types of master equations in describing nonequilibrium phenomena with memory effect: (i) the memory function type and (ii) the nonstationary type. A generalized Polya process is studied within the framework of a non-stationary type master equation approach. For a transition-rate with an arbitrary time-dependent relaxation function, the exact solution of a generalized Polya process is obtained. The characteristic features of temporal variation of the solution are displayed for some typical time-dependent relaxation functions reflecting memory in the systems. 1. Introduction The generalized master equation of memory function type [1] is a useful basis for analyzing non-equilibrium phenomena in open systems as where the kernel is conventionally assumed to have the product of a memory function with a transition rate as . The transition rate has the constraint with . This generalized master equation approach corresponds to the generalized Langevin equation of the memory function type [2, 3]. One can see many successful applications with long memory along the line of traditional formulation [1]. Looking around recent studies in complex open systems, there is an alternative approach based on a generalized non-stationary master equation [4] as The master equation in this form corresponds to the generalized Langevin equation of the convolutionless type, which is derived with the aid of projection operator method by Tokuyama and Mori [5]. The time-dependent coefficient may be written in the following form: . It is expected from the projection operator method [5] that the time-dependent function reflects the memory effect from varying environment in a different way associated with the memory function (cf. also H?nggi and Talkner [6]). The memory function (MF) formalism has been utilized in anomalous diffusion like Lévy type diffusion in atmospheric pollution, diffusion impurities in amorphous materials, and so on. The alternative convolution-less, non-stationary (NS) formalism gives only a small number of applications. The paper intends to exhibit a potential ability of the NS formalism by taking an arbitrary time-dependent function which is representing memory effect. The paper is organized as follows. Section 2 reviews the non-stationary Poisson process. Section 3 shows a generalized Polya process wherein it is involved a generalized non-stationary transition rate with an arbitrary function of time. The exact solution and the expression mean and variance are displayed as a function of . Some important remarks are given for a generalized
Achievements and Challenges in Molecular Conductors
Hidetoshi Fukuyama
Crystals , 2012, DOI: 10.3390/cryst2030875
Abstract: Molecular solids are generally highly insulating. The creation of conducting molecular solids proved to be a major scientific challenge. As in the case of Si technology, the challenge started as impurity doping in band insulators and then developed into highly doped polymers, which are not crystalline. More conducting materials in crystalline forms have been realized in charge transfer (CT) complexes with two different kinds of molecules, where electrons are transferred between them in solids. In such CT complexes, not only conducting, but also even superconducting systems were achieved in 1980 and today more than 100 different superconductors are known. The most remarkable achievement in this direction was the realization of a truly metallic state in molecular solids based on a single kind of molecule. These are called single component molecular metals (SCMM) and consist of a rich variety of electronic properties. In these conducting molecular solids, CT and SCMM, many interesting electronic properties resulting from mutual Coulomb interactions and electron-phonon interactions have been explored so far, and these will be reviewed briefly in this article from a theoretical viewpoint. Challenges to come, based on these achievements, are also discussed at the end of this review.
Le faux Jugement de Paris — une lecture du frontispice de La Philosophie dans le boudoir
Hidetoshi Nakamura
Trans : Revue de Littérature Générale et Comparée , 2009,
Abstract: Le frontispice de La Philosophie dans le boudoir représente, en apparence, un Jugement de Paris. Par son ambiance galante et philosophique, il attire le lecteur/spectateur et l’incite à entrer dans le monde sadien. Cette trompeuse amorce permet en fait à l’auteur de renverser toutes les valeurs établies par le biais d’une redéfinition du plaisir, et ouvre à un questionnement sur l’usage du faux dans le contexte pédagogique des Lumières. The frontispiece of La philosophie dans le boudoir seemingly represents the scene of the Judgement of Paris. By establishing a gallant and philosophical ambiance, it attracts the reader/spectator and calls her or him into Sade’s world. The art, both pictorial and textual, of employing the “trompeuses amorces” consists of reversing all of the established values through a redefining of pleasure. It reappraises the problems of the use of the false in the pedagogic context of the Enlightenment.
Nefness of adjoint bundles for ample vector bundles
Hidetoshi Maeda
Le Matematiche , 1995,
Abstract: Let E be an ample vector bundle of rank >1 on a smooth complex projective variety X of dimension n. This paper gives a classification of pairs (X,E) whose adjoint bundles K_X+det E are not nef in the case when r=n-2.
Fixed Point Properties Related to Multivalued Mappings
Hidetoshi Komiya
Fixed Point Theory and Applications , 2010, DOI: 10.1155/2010/581728
Abstract: We discuss fixed point properties of convex subsets of locally convex linear topological spaces. We derive equivalence among fixed point properties concerning several types of multivalued mappings.
Fixed Point Properties Related to Multivalued Mappings
Komiya Hidetoshi
Fixed Point Theory and Applications , 2010,
Abstract: We discuss fixed point properties of convex subsets of locally convex linear topological spaces. We derive equivalence among fixed point properties concerning several types of multivalued mappings.
Operation-Based Notation for Archimedean Graph
Hidetoshi Nonaka
Journal of Systemics, Cybernetics and Informatics , 2008,
Abstract: We introduce three graph operations corresponding to polyhedral operations. By applying these operations, thirteen Archimedean graphs can be generated from Platonic graphs that are used as seed graphs.
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