著者
鄭 星在 与那嶺 牧子 青木 俊之
出版者
社団法人 可視化情報学会
雑誌
可視化情報学会誌 (ISSN:09164731)
巻号頁・発行日
vol.27, no.Supplement2, pp.67-70, 2007-09-15 (Released:2009-07-31)
参考文献数
9

The present paper describes the effect of duct length on acoustic characteristics of over-expanded jet which are discharged from convergent-divergent nozzle. A duct made of annular metal was installed at the nozzle exit and varied in length from 0 and 6D. A Schlieren optical system is used to visualize detailed jet structures. Acoustic measurement is performed to obtain noise spectra. The results obtained show that the frequency of the acoustic tone due to the shock wave within the nozzle somewhat increases with an increase in the nozzle pressure ratio, and the acoustic tones take place in two stages. The duct devices suppress the acoustic tone and the screech tone.
著者
吾妻 崇 太田 陽子 小林 真弓 金 幸隆
出版者
公益社団法人 日本地理学会
雑誌
地理学評論. Ser. A (ISSN:00167444)
巻号頁・発行日
vol.69, no.5, pp.365-379, 1996-05
参考文献数
12
被引用文献数
1

The Nojima earthquake fault appeared along the recognized active fault in the northwestern part of Awaji Island in association with the 1995 Hyogoken-Nanbu Earthquake. This earthquake fault is dominated by right-lateral offset (max. 1.7m), with a high-angle reverse fault which has a maximum verlical displacement of 1.3m uplift on the southeastern side. We have repeated the measurement of seven profiles of the fault scarp at two areas (Hirabayashi, Ogura). The fault scarp of the Hirabayashi area (profiles 1-4) is composed of the Plio-Pleistocene Osaka Group at the base and is overlain by an unconsolidated gravel bed at the top. The Ogura area (profiles 5-7) is entirely underlain by the Plio-Pleistocene Osaka Group. The fault scarp in these two areas is characterized by an overhanging slope due to thrusting of the upthrown side. Scarp retreat at Hirabayashi occurred in association with the sudden collapse of the gravel bed and proceeded more quickly than at Ogura, where fault scarp retreat proceeded by exfoliation of the fault plane as well as partial collapse of the Osaka Group. These facts strongly indicate that the lithological control is most significant for the formation of original fault scarp as well as retreat. The retreat of fault scarp was very slow after March to June at Hirabayashi and June to July at Ogura, and proceeded more quickly than some of seismically generated normal faults.
著者
平野 昌繁
出版者
公益社団法人 日本地理学会
雑誌
地理学評論 (ISSN:00167444)
巻号頁・発行日
vol.39, no.9, pp.606-617, 1966
被引用文献数
1

斜面発達とくに断層崖発達に関する数学的モデルを論じた時には,斜面発達の数学的モデル化の大綱をのべるにとどまったから,ここでは数学的モデルにおける侵蝕係数の比,有限山体のモデル化,特別な境界条件の例,先行性河谷の例,斜面形の分類などについて, 2次元化された抽象的な斜面としてとりあつかう.この立場では,斜面は対称斜面と非対称斜面に2分され,後者はさらに凸型斜面と凹型斜面,不規則斜面に細分される.これらは何れも衝撃的隆起のあとにあらわれる斜面形であるが,そうでない場合にはことなった斜面形があらわれる.
著者
平野 昌繁
出版者
公益社団法人 日本地理学会
雑誌
地理学評論 (ISSN:00167444)
巻号頁・発行日
vol.39, no.5, pp.324-336, 1966
被引用文献数
8 4

A mathematical model of slope development is summarized by the relation<br> _??_<br> where <i>u</i>: elevation, <i>t</i>: time, <i>x</i>: horrizontal distances, <i>a</i>: subdueing coefficient, <i>b</i>: recessional coefficient, <i>c</i>: denudational coefficient and <i>f</i> (<i>x</i>, <i>t</i>): arbitrary function of <i>x</i> and <i>t</i>, respectively. Effects of the coefficients are shown in figs. 1-(A), (B) and 2-(A).<br> In order to explain the structural reliefs, the spatial distribution of the rock-strength against erosion owing to geologic structure and lithology is introduced into the equation by putting each coefficient equal a function, in the broadest sence, of <i>x</i>, <i>t</i> and <i>u.</i> Two simple examples of this case are shown in fig. 5.<br> The effects of tectonic movements, for instance of faulting, are also introduced by the function <i>f</i> (<i>x</i>, <i>t</i>), which is, for many cases, considered to be separable into <i>X</i> (<i>x</i>) and <i>T</i> (<i>t</i>), where <i>X</i> (<i>x</i>) and <i>T</i> (<i>t</i>) are functions of <i>x</i> only and <i>t</i> only, respectively. An attempt to classify the types of <i>T</i> (<i>t</i>) has been made.<br> Generally speaking, provided the coefficients <i>a</i>, <i>b</i> and <i>c</i> are independent of <i>u</i>, the equation is linear and canbe solved easily. With suitable evaluation of the coefficients (as shown, for example, in fig. 4-(A)), this linear model can be used to supply a series of illustrations of humid cycle of erosion, especially of the cycle started from faulting.

1 0 0 0 理科教育

出版者
理科教育研究会
巻号頁・発行日
vol.15, no.6, 1932-06
著者
長島 順清
出版者
一般社団法人 日本物理学会
雑誌
日本物理学会誌 (ISSN:00290181)
巻号頁・発行日
vol.60, no.3, pp.171-179, 2005

素粒子物理学の100年を日本の著名な科学者の業績と思考に重点を置いて述べる.1935年からの最初の四半世紀は, 先駆者仁科および理論の3巨頭湯川・朝永・坂田が日本を先導した.標準理論が形成される1960-70年代には, 随所に南部のアイデアが光る.次に日本が高エネルギー実験分野で世界の3極になるまでの経過を追い, 最後に, KEKB/Belleグループによる小林・益川理論の検証と, 小柴に始まるニュートリノ物理学の興隆で締めくくる.