DSpace コレクション: 1990-03
http://hdl.handle.net/11133/112
1990-032024-03-29T15:37:38Z超音波スペクトロスコピー法を適用したコンクリートの劣化度評価に関する研究(その2) : アルカリ骨材反応を受けたモルタルの場合
http://hdl.handle.net/11133/847
タイトル: 超音波スペクトロスコピー法を適用したコンクリートの劣化度評価に関する研究(その2) : アルカリ骨材反応を受けたモルタルの場合
著者: 山田, 和夫
抄録: Ultrasonic spectroscopy technique was applied to evaluating the quality of concrete damaged by the alkali aggregate reaction, as one of the non-destructive testing technique for concrete. The energy and the maximum amplitude of measured wave propagating through the mortar specimens decreased, and the energy moment and the energy dispersion increased with the progressive damage of specimen by the alkali aggregate reaction. The energy of propagated wave was more sensitively affected by the damage of the internal structure of specimen than the maximum amplitude and pulse velocity. The maximum amplitude, the average frequency and the energy of measured waveform, and further the particular energy of the frequency transfer function in the specific frequency range were closely related the change of internal structure of mortar, due to the damage by the alkali aggregate reaction. The results obtained by the present study suggested that the assessment of damage in mortar by the alkali aggregate reaction was possibly accomplished by the ultrasonic spectroscopy technique.1990-03-30T15:00:00Z締固めた土の動的変形特性に関する研究
http://hdl.handle.net/11133/848
タイトル: 締固めた土の動的変形特性に関する研究
著者: 奥村, 哲夫; 成田, 国朝; 大根, 義男
抄録: Finite element dynamic response analysis has been the most practical and valuable tool for use in the examination of seismic stability of fill-type dams. To make FE-solutions more accurate and reliable, extensive studies are still required on the dynamic properties of embankment materials and foundation soils. In this paper, some discussions are given on the dynamic deformation characteristics, especially dynamic shear modulus of deformation, of compacted fill materials. An attempt is made to propose some useful formulae of estimating dynamic shear modulus through static shear strength. Main results are summarized as follows : 1) Characteristics of dynamic shear modulus of compacted soils depend on the pre-compression effects. 2) Unconfined compressive strength can be a practically useful measure to represent these pre-compression effects. 3) Dynamic shear modulus of compacted soils can practically be estimated through their static shear strength.1990-03-30T15:00:00Zコンピュータ統合生産システム構築の概念
http://hdl.handle.net/11133/849
タイトル: コンピュータ統合生産システム構築の概念
著者: 近藤, 高司; 鈴木, 達夫
抄録: The purpose of this paper is to define a concept of a computer integrated manufacturing system. The integrated manufacturing system has become a strategic issue for most of Japanese manufacturing industries. Recently the production system of multi-items and small quantity by using the JIT or the MRP system is popular in order to quickly respond to changes of the worldwide consumption markets. CIM means the interaction between people and automatic machines with information systems to integrate and automatically execute. CIM concept and the historical development for the effective manufacturing were discussed.1990-03-30T15:00:00Z自軸まわりに回転する円柱に作用する力(定常回転する場合)
http://hdl.handle.net/11133/850
タイトル: 自軸まわりに回転する円柱に作用する力(定常回転する場合)
著者: 水谷, 充; 村上, 光清
抄録: The Magnus force on a rotating body traveling through a fluid is partly responsible for the inaccuracy and dispersion of ballistic missiles and rifle shells. A great deal of efforts has been done to predict the detail behaviors of the force under various conditions. Most of them, however, are experimental studies about time-independent ambient flows. The behavior of the force acting on a time-dependent rotating cylinder has not yet studied sufficiently. As a first step to the time-dependent flow problem, this paper describes details of the forces on a constant-speed rotating cylinder in relation to the velocity ratio; peripheral velocity of cylinder/free stream velocity.1990-03-30T15:00:00Z