18 research outputs found

    Newsletter Fumi No.21

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    pdf●知の網の目へ ●基幹事業センターについて ●古典籍データ駆動研究センターにおける国文研DDHプロジェクトへの取組 ●こんな古典籍があった! ―国書データベース典籍画像紹介―第一回 『声色(こわいろ)早合点(はやがてん)』三編三冊(合綴一冊) ●国文研DDHプロジェクトキックオフシンポジウム見聞録 ●事業トピックスothe

    Observation of B+→pp̅π+, B0→pp̅K0, and B+→pp̅K*+

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    人工林における野ネズミの生息状況および微生息環境選好性

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    2006-12人工林の構造の相違と野ネズミの生息状況との関係および人工林内での野ネズミの利用環境,すなわち微生息環境に対する選好性を明らかにし,これらを野ネズミの格間で比較した.捕獲された野ネズミはアカネズミ,ヒメネズミ,およびスミスネズミであった.アカネズミは森林構造の相違に関わらず生息し,さらにその中で様々な微生息環境を利用していた.ヒメネズミは森林構造の相違に関わらず生息していたが,人工林内において倒木の多い場所などを高頻度で利用していたOスミスネズミは沢沿いの調査区のみで捕獲され,地表堆積物の豊富な環境を高頻度で利用していたoLたがって,人工林における野ネズミの生息条件およびその中での微生息環境に対する選好性は種によって異なると推察された。農林水産研究情報総合センターで作成したPDFファイルを使用している。departmental bulletin pape

    A Method of Estimation of Thicknes and Elastic Moduli of Soils by Harmonic Loads on Ground Surface

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    This paper presents numerical examples demonstrate a capability of method of estimating the elastic properties of the soils and their variation with depth using the characteristics of P-SV wave fields caused in the surface of an elastic multi-layered half space by the vertical harmonic point load applied also on the soil surface. In this numerical examples, the three cases of ground model are used the models of typical shallow surface ground: case 1 is a nomal soil deposit where soil properties increase with their depth from the ground surface while case 2 and 3 are the irregular soil deposits. In case2, the second layer is a low velocity layer and in case3 it is a high velocity layer. In this paper, the unknown parameters that estimate by the proposed method are the thicknesses of the soil layers and their S and P wave velocities. In the numerical examples, the stiffness matrix method is used for an accurate simulation of all P-SV wave fields

    A Method of Estimation of SubSurface Ground Structure and Elastic Soil Properties Using Vertical Harmonic Loading on Ground Surface and Its Numerical Verification

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    This paper presents a method of estimating the elastic properties of the soils and their variation with depth using the characteristics of P-SV wave fields caused in the surface of an elastic multi-layered half space by the vertical harmonic point load applied also on the soil surface. To demonstrate the capability of the proposed method, the two numerical examples are presented for the estimation of S wave velocity, P wave velocity and thickness of each soil layer, using a three-layered half space and a five-layered half space. In the numerical examples, the stiffness matrix method is used for an accurate simulation of all P-SV wave fields

    Characteristics of P-SV Wave Propagation and Displacements

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    Elastic waves generated by a controlled dynamic load applied on the surface of soil deposits yield useful tools for non destructive testing of the systems to determine the elastic properties of the soils and their variation with depth. A number of methods for the non destructive testing have been developed and are being used in practice. The objective of this paper is to examine some of the basic concepts related to P-SV wave propagation in layered media and their dynamic response due to the vertical harmonic point load applied on the soil surface. A proper understandings of these concepts is necessary for a correct interpretation of the field data and for improving the accuracy of the estimation of the soil properties at low strain values by using the spectral analysis of surface waves or the Rayleigh wave method
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