474 research outputs found
Potential of 3D-CAD use for passing on of traditional carpentry techniques of Kintai Bridge
Kintai Bridge is the historical wooden arch bridge structure in Iwakuni City, Yamaguchi Prefecture in Japan. The completion of this bridge was in 1673, spanning the Nishiki river in a series of five wooden arches. The second, third and fourth bridges are 35.10m in span, while the first and fifth bridges are 34.80m in span, and total length is 193.33m, 4.60m in width. More than 20,000 parts combined construct this bridge. Repairs of the wooden members and reconstruction of the whole bridge take place every few decades. In Japan, the wooden arch bridge is like no other Kintai Bridge. This bridge is rare in the world. So, now, for the registration of World Heritage is promoting a variety of surveys. In this study, we focus on carpentry techniques for such an unusual bridge. For example, the features of the carpentry techniques applied in Kintai Bridge, the problems when passing on carpentry techniques, and for future carpenters, how to communicate carpentry techniques. Present Kintai Bridge also maintains a similar structure when it was built. From now on, the following systematization is important to maintain the structure of Kintai Bridge. (1) Personnel training on the ordering party’s side (Iwakuni City), (2) Passing down of carpentry techniques (training of junior carpenters) and (3) Retention of the supply system. In this study, using 3D-CAD to traditional carpentry techniques is proposed. As a result, it is possible to visualize of the construction process, output of specialized knowledge, and also bring up the successor, disseminate of information to the public. Then, reading from drawing and process of making 3D-CAD with the specialist (carpenter) are formed
Comet 9P/Tempel 1: Interpretation with the Deep Impact Results
According to our common understandings, the original surface of a
short-period comet nucleus has been lost by sublimation processes during its
close approaches to the Sun. Sublimation results in the formation of a dust
mantle on the retreated surface and in chemical differentiation of ices over
tens or hundreds of meters below the mantle. In the course of NASA's Deep
Impact mission, optical and infrared imaging observations of the ejecta plume
were conducted by several researchers, but their interpretations of the data
came as a big surprise: (1) The nucleus of comet 9P/Tempel 1 is free of a dust
mantle, but maintains its pristine crust of submicron-sized carbonaceous
grains; (2) Primordial materials are accessible already at a depth of several
tens of cm with abundant silicate grains of submicrometer sizes. In this study,
we demonstrate that a standard model of cometary nuclei explains well available
observational data: (1) A dust mantle with a thickness of ~1-2 m builds up on
the surface, where compact aggregates larger than tens of micrometers dominate;
(2) Large fluffy aggregates are embedded in chemically differentiated layers as
well as in the deepest part of the nucleus with primordial materials. We
conclude that the Deep Impact results do not need any peculiar view of a comet
nucleus.Comment: 11 pages, 1 figure, 1 table. ApJ letters, 673, L199-20
AI-Josyu: Thinking Support System in Class by Real-time Speech Recognition and Keyword Extraction
In this paper, we present a thinking support system, AI-Josyu. This system also operates as a class support system which helps to teachers for lightening their work. AI-Josyu is implemented based on media-driven real-time content management framework. The system links real world media and legacy media contents together. In resent years, it is easier to collect a large amount of various kinds of data which are created with sensors in the real world. The system realizes interconnection and utilization of legacy media contents. The legacy media contents are generated and scattered on the Internet. The framework has four modules, which are called “acquisition,†“extraction,†“selection,†and “retrieval.†The real world media and the legacy media contents are interconnected by these modules. This interconnection includes semantic components. This system records teacher's voice of its lecture in real time and presents retrieved legacy media contents corresponding to subject of the lecture. By this presentation, preparing of the legacy contents is not required. This system automatically retrieves and shows the legacy media contents. This system helps students to understand contents of the lecture. In addition, the system attends to expansion of ideas. We constructed the system and conducted the demonstration in class. It shows that the system is helpful to teacher and students for expansion of thinking
Cubic lead perovskite PbMoO3 with anomalous metallic behavior
A previously unreported Pb-based perovskite PbMoO is obtained by
high-pressure and high-temperature synthesis. This material crystallizes in the
cubic structure at room temperature, making it distinct from
typical Pb-based perovskite oxides with a structural distortion. PbMoO
exhibits a metallic behavior down to 0.1 K with an unusual -sub linear
dependence of the electrical resistivity. Moreover, a large specific heat is
observed at low temperatures accompanied by a peak in around 10 K, in
marked contrast to the isostructural metallic system SrMoO. These transport
and thermal properties for PbMoO, taking into account anomalously large Pb
atomic displacements detected through diffraction experiments, are attributed
to a low-energy vibrational mode, associated with incoherent off-centering of
lone pair Pb cations. We discuss the unusual behavior of the electrical
resistivity in terms of a polaron-like conduction, mediated by the strong
coupling between conduction electrons and optical phonons of the local
low-energy vibrational mode.Comment: 5 pages, 5 figure
Study on Dynamic Characteristics of a Pile Group Foundation
The earthquake response of a structure on group of piles is investigated. The test model, which is employed in this study, is a foundation on four piles. Three conditions are prepared for examination of the contact effects of the foundation bottom and the backfilling effects on dynamic characteristics of the foundation on the piles. Forced vibration tests are carried out for ascertaining the impedance functions as the inertial interaction, and earthquake observations for the earthquake input motion as the kinematic interaction. On the basis of the test and the observation results, the correlation analyses are executed for examining the applicability of the analytical method based on the substructure method in which the three-dimensional wave propagation theory is applied for calculation of the Green\u27s functions. The analytical method is concluded to have sufficient applicability for the practical design procedure of a structure on pile group
Proximal (entry) tear of dissecting aortic aneurysm visualized by three-dimensional echocardiography
AbstractJ Thorac Cardiovasc Surg 2002;124:1245-
Mechanisms of Neuronal Death in Synucleinopathy
α-synuclein is a key molecule in the pathogenesis of synucleinopathy including Parkinson's disease and multiple system atrophy. In this mini-review, we mainly focus on recent data obtained from cellular models of synucleinopathy and discuss the possible mechanisms of neurodegeneration. Recent progress suggests that the aggregate formation of α-synuclein is cytoprotective and that its precursor oligomer (protofibril) may be cytotoxic. The catechol-derived quinones are the candidate molecules that facilitate the oligomer formation of α-synuclein. Furthermore, the cellular membranes are shown to be the primary targets injured by mutant α-synucleins, and the mitochondrial dysfunction seems to be an initial step in the neuronal death
超音速ジェットレーザー分光によるL-チロシン及びその水和クラスターの安定コンフォマーの研究
第1回分子科学討論会, 2007年9月17日-20日, 東北大学川内北キャンパス(仙台), 3B1
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