Behaviour of Saturated Sand Models under Principal Stress Axes Rotation in Shake Table Tests

One dimensional shake table tests were performed on saturated loose or medium dense Toyoura sand models, in order to study the response of level grounds during earthquakes and the nature of generated excess pore water pressure. 12 virgin models which prepared under identical condition, were subjected to cyclic and three different irregular shear stress patterns. It is shown that there is correlation between excess pore pressure ratio and developed shear strain, independent from applied shear stress histories and density of the models. Also, the relations of accumulated shear work as well as normalized shear work, per unit volume, are considered with generated pore pressure. According to the results of this study, in the first part of the experiments that undrained condition can be assumed, mentioned parameters correlate with excess pore pressure. This relation is independent from stress path for shear work and from stress path and confining pressure for normalized shear work

チェビシェフ タコウシキ ノ ゼロ テン ノ セイド ニ カンスル イチコウサツ

ごく特殊な多項式の値の精度は、計算方法を変えることによって大きく向上することがある。例えば、Chebyshev多項式の数値解の精度はHorner法による計算の代わりに漸化式計算で求めることによって大きく向上される。本論文では、漸化式計算値を用いて得られるゼロ点の精度桁数を評価し、その特性について考察を行った。When the recurrence rule is applied to evaluate the zeros of Chebyshev polynomial, the number of accurate digits of the approximation is almost equal to the calculation digits even if it has the cluster zeros. We consider the peculiar phenomenon and give some remarks

Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon

A search for new isotopes using in-flight fission of a 345 MeV/nucleon 238U beam has been carried out at the RI Beam Factory at the RIKEN Nishina Center. Fission fragments were analyzed and identified by using the superconducting in-flight separator BigRIPS. We observed 45 new neutron-rich isotopes: 71Mn, 73,74Fe, 76Co, 79Ni, 81,82Cu, 84,85Zn, 87Ga, 90Ge, 95Se, 98Br, 101Kr, 103Rb, 106,107Sr, 108,109Y, 111,112Zr, 114,115Nb, 115,116,117Mo, 119,120Tc, 121,122,123,124Ru, 123,124,125,126Rh, 127,128Pd, 133Cd, 138Sn, 140Sb, 143Te, 145I, 148Xe, and 152Ba

Development of Commercial Cultivation of Field Crops in Thailand : A Case Study in Saraburi and Lopburi Provinces (<Special Issue>Transformation of Agriculture in Northeast Thailand)

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました。Rice and rubber were major farm products for export from Thailand before the 1950s. Maize and other field crops were added to them in the 1960s. They were cultivated in newly opened lands. This paper describes the process of reclamation and the changes thereafter in a typical area of commercial cultivation of maize, and analyzes the land, technological and economic factors related to them. The fieldwork was carried out in an area extending between Saraburi and Lopburi provinces, which was reclaimed in the 1950s. Within the area, significant variations in cropping pattern, technology and productivity were observed. These spatial variations were largely governed by such physical conditions as rainfall and soil until around 1980. Thereafter, various modern technologies were adopted within a short period, which resulted in greater diversification in crops and the farming system

Use of Natural Biological Resources and Their Roles in Household Food Security in Northwest Laos(<Special Issue>Sustainable Agro-resources Management in the Mountainous Region of Mainland Southeast Asia)

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました

センナン センエン コウイキ スイドウヨウスイ キョウキュウ ジギョウ ジシンドウ キロク カイセキ ヘイセイ 4ネンド

書誌情報のみBibliographic data Onl

ニホンカイ チュウブ ジシン ニオケル ハチロウガタ ショウメン テイボウ ノ シンドウ セイジョウ ニ カンスル ハドウロンテキ コウサツ

書誌情報のみBibliographic data Onl

コトブキヤマ ダンチ ジシン サイガイ ゲンイン チョウサ ギョウム

書誌情報のみBibliographic data Onl

ジシンドウ キロク カイセキ

書誌情報のみBibliographic data Onl