著者

森本 敏文 森 一郎

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会論文誌. C, エレクトロニクス (ISSN:13452827)

巻号頁・発行日

vol.83, no.1, pp.23-29, 2000-01-25

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電子ビームを低圧力(〜10^<-4>Torr)のガス中に注入すると, ビーム・プラズマ相互作用により, 様々な波動が生じる.これらの波動は境界条件を考慮したTrivelpiece-Gouldモードで表されるが, その成長率を求めることはこれまでほとんど行われていない.本論文ではTrivelpieceとGouldの用いた線形分散関係式を改めて複素数で計算し, その結果から, ビーム・プラズマ系において, ガス圧力を変化した場合, どのモードが強力に励起されるかを明らかにする.また, この計算による波動の性質と我々の実験結果を比較検討する.

著者

村井弦斎 著

出版者

博文館

巻号頁・発行日

1903

著者

市原 和彦 寒竹 司 田口 敏彦 Jung R

出版者

社団法人日本リハビリテーション医学会

雑誌

リハビリテーション医学 : 日本リハビリテーション医学会誌 (ISSN:0034351X)

巻号頁・発行日

vol.43, no.9, 2006-09-18

著者

岡本 哲和

出版者

関西大学

雑誌

情報研究 : 関西大学総合情報学部紀要 (ISSN:1341156X)

巻号頁・発行日

vol.23, pp.1-36, 2005-07-15

被引用文献数

1

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本稿の目的は,2003年11月7日に実施された衆議院選挙のデータを利用して,候補者がどのような内容のウェブサイトを開設しているのか,またその内容に影響を及ぼす要因は何かという問題を,数量分析を用いて明らかにすることである.相互作用性,情報提供,プレゼンテーション,アクセスの容易性の4つの基準に従って各ウェブサイトの充実度を測る指標を作成し,それを従属変数として順序プロビットによる分析を行った.その結果として,立候補タイプや候補者の社会的属性とともに,所属政党および候補者の地位がサイトの充実度に影響を及ぼしていたことが明らかになった.このような分析結果は,他の先進諸国と同様に我が国においても「通常化」の現象が進行しつつあることを示唆している.

著者

木村 昌三

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.110, no.4, pp.581-591, 2001-08-25 (Released:2009-11-12)

参考文献数

32

被引用文献数

2 2

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Seismicity characteristics in and around Shikoku, southwest Japan are investigated using recent data from microearthquake observations. Earthquakes occurring in the regions are distinctly divided into crustal and mantle earthquakes according to about 22 km in focal depth. Crustal and mantle earthquakes have predominantly the strike-slip type with P axes in the east-west and north-south directions, respectively. Although the Philippine Sea plate is subducting under Shikoku in the northwest direction from the Nankai trough, the P axis of mantle earthquakes in eastern Shikoku is inferred to be stable in the N-S direction during the period before the 1946 Nankai earthquake until today. On the other hand, earthquakes with normal fault type occur infrequently in the aseismic portion deeper than the north dipping mantle earthquake zone.A gradual lowering of crustal earthquake activity has continued since 1968 in which our microearthquake observation started in central Shikoku. Taking the abrupt decreasing of events in Shikoku before the 1946 Nankai earthquake by JMA data into consideration, the present activity is expected to become lower extremely just before the next Nankai earthquake.

著者

小林 昭夫 真砂 礼宏 吉田 明夫

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.48, no.1, pp.1-12, 2002-03-25 (Released:2011-03-01)

参考文献数

28

被引用文献数

1

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We examined tide gauge records at stations in and around the Kui peninsula to find if a precursory crustal deformation occurred before the 1946 Nankai earthquake. First, we removed effects of atmospheric pressure and astronomical tide on the records. Then, we tried to get rid of the effects of the oceanic current by taking the difference of the records betweentwo stations. After these corrections we found that sea level at Uragami where is located on the southeastern coast of the Kui peninsula had risen about 10 cm just before the Nankai earthquake. The sea level change, if we consider that to represent real subsidence of land near Uragami, could be explained by supposing that a slow fault slip corresponding to moment magnitude 6.9 occurred on the plate boundary in the offing of southeast of the Kui peninsula near the hypocenter of the Nankai earthquake.

著者

小林 昭夫 吉田 明夫

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.50, no.1, pp.39-42, 2004-03-25 (Released:2010-09-07)

参考文献数

11

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We investigated crustal deformation after the 1946 Nankai earthquake using tide gauge records. Although resolution of tide gauge records is not so high for seeing the temporal change in detail, vertical crustal movements whose relaxation times are between several months to years can be detected by them. It was reported that there had been a postseismic crustal deformation with a time constant of 4-5 months in southern Kui Peninsula (Kobayashi et al., 2002). In this paper we show that crustal deformations with a longer relaxation time of a few years were observed in northern Shikoku, examining tide gauge records at such stations as Takamatsu, Sumoto and Kobe. These observations suggest that there was a time lag in the development of postseismic slip between shallow and deeper parts on the plate interface after the Nankai earthquake.

著者

Hasegawa Masaru Arai Emi Kojima Wataru Kitamura Wataru Fujita Go Higuchi Hiroyoshi Watanabe Mamoru Nakamura Masahiko

出版者

日本鳥学会

雑誌

Ornithological science (ISSN:13470558)

巻号頁・発行日

vol.9, no.2, pp.161-164, 2010-12

被引用文献数

24 3

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On average, male birds other than social father sire more than 10% of all offspring. Levels of extra-pair paternity below 5% of offspring are rarely found and are now considered worthy of explanation in monogamous birds. We recorded the lowest levels of paternity loss ever reported in a population of Barn Swallows Hirundo rustica. The levels of extra-pair paternity were below 5% of offspring (7/243 in 2005 and 1/53 in 2006). We discuss our results in relation to the density-dependence of extra-pair paternity.

著者

Liu Yaping Yamanaka Tsutomu

出版者

Elsevier B.V.

雑誌

Journal of hydrology (ISSN:00221694)

巻号頁・発行日

vol.464–465, pp.116-126, 2012-09

被引用文献数

99 4

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Mountain–plain transitional landscapes are especially important as groundwater recharge zones. In this study, the oxygen and hydrogen stable isotopic composition (δ18O and δD) of water and hydrochemical information were employed to quantify contribution ratios of different sources of groundwater recharge in the Ashikaga area of central Japan. The study area is situated between the Ashio Mountains and the Kanto Plain, and the Watarase River flows into the region parallel to the mountain–plain boundary. There was an obvious isotopic altitude effect in and around the study area (−0.25‰ per 100 m for δ18O and −1.7‰ per 100 m for δD), and the isotopic signatures of water from the Watarase River and local precipitation could be clearly distinguished. In addition, it was possible to identify the occurrence of mountain block recharge using hydrochemistry, specifically the chloride ion. End-member mixing analysis using δ values and Cl− concentration revealed spatial variation in the contribution ratios of the river water, mountain block groundwater and local precipitation. Seepage from the Watarase River contributed a significant amount of water to aquifers along its channel. The river-recharged water reached 5 km from the channel in the south (i.e., plain) side and 1.6 km or less in the north (i.e., mountain) side. Remarkable mountain block recharge was observed in the foothills near the axis of the syncline, which has layers of chert and sandstone that likely hinder river channel seepage into the mountain-side aquifers. Major factors controlling the river-water contribution ratio include the distance from the river channel, topography, and hydrogeological settings. The results presented here should facilitate integrated management of groundwater and surface water resources.

著者

Hasegawa Masaru Arai Emi Watanabe Mamoru Nakamura Masahiko

出版者

日本鳥学会

雑誌

Ornithological science (ISSN:13470558)

巻号頁・発行日

vol.9, no.2, pp.141-148, 2010-12

被引用文献数

44 6

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The maintenance of multiple ornaments by animals can be explained when those multiple ornaments are sexually selected. However, there have been only a few studies of sexual selection on multiple ornaments. We investigated sexual selection on two ornaments, plumage coloration and white spots in the tail, in a population of Barn Swallows Hirundo rustica gutturalis in Japan. There was sexual dimorphism in throat coloration and in the size of the white spots in the tail. Males with a less saturated (colourful) throat and larger white spots in the tail bred earlier than others, indicating a mating advantage for these males. These trends are what would be expected if these ornaments were indeed sexually selected.

著者

Destici Eugin Oklejewicz Małgorzata Saito Shoko van der Horst Gijsbertus T.J.

出版者

Landes Bioscience

雑誌

Cell cycle (ISSN:15384101)

巻号頁・発行日

vol.10, no.21, pp.3788-3797, 2011-11

被引用文献数

21 8

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By gating cell cycle progression to specific times of the day, the intracellular circadian clock is thought to reduce the exposure of replicating cells to potentially hazardous environmental and endogenous genotoxic compounds. Although core clock gene defects that eradicate circadian rhythmicity can cause an altered in vivo genotoxic stress response and aberrant proliferation rate, it remains to be determined to what extent these cell cycle related phenotypes are due to a cell-autonomous lack of circadian oscillations. We investigated the DNA damage sensitivity and proliferative capacity of cultured primary Cry1‑/-

著者

岩﨑 洋樹 須田 大祐 渡辺 守

出版者

日本応用動物昆虫学会

雑誌

日本応用動物昆虫学会誌 (ISSN:00214914)

巻号頁・発行日

vol.53, no.4, pp.165-171, 2009-11

被引用文献数

4 1

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Adult Sympetrum infuscatum (Selys) live in the forest gaps throughout their life except when visiting rice paddy fields for oviposition. They prey on small flying insects in the forest gaps, using sit-and-wait tactics. They perch on the tips of branches or grass all day and take off when a small flying insect comes into sight. In the present study, the foraging behavior of S. infuscatum in the forest gaps was observed. The perching height was high in the morning and evening and low around noon. The diurnal change in the perching height corresponded to the abundance of flying small insects. The mean daily frequency of foraging flights was 251 for females and 182 for males, and the mean actual number of insects captured was 109 and 89, respectively. A total of 2,935,300 small flying insects were preyed on by S. infuscatum adults during one day in the Satomaya forest gaps.

著者

Hasegawa Masaru Arai Emi Watanabe Mamoru Nakamura Masahiko

出版者

日本鳥学会

雑誌

Ornithological science (ISSN:13470558)

巻号頁・発行日

vol.7, no.2, pp.117-122, 2008-12

被引用文献数

26 8

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It is necessary to correct plumage color fading when comparing the plumage coloration of birds captured at different times during the breeding season. We proposed two methods for correcting plumage color fading and compared them using the throat feathers of the Barn Swallow (Hirundo rustica gutturalis). One method uses the color shift of feathers on live birds during the same breeding season (the field method). The other method uses longitudinal color measurements of feathers placed on the open ground (the experimental method). This method has an advantage of not capturing the birds twice. The field and experimental methods estimated similar rates of fading of hue and brightness. Saturation was predicted to fade with time in the experimental method, which is unrealistic because there was no effect of time on saturation in live birds. Using the field method, we derived an equation for correcting plumage color fading in Barn Swallows. When assessing changes in plumage color, the field method should be used whenever possible since this method estimates plumage color fading in live birds.

著者

野崎 いずみ

巻号頁・発行日

1993

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筑波大学博士 (教育学) 学位論文・平成5年3月25日授与 (甲第1053号)

著者

倉本 英彦

巻号頁・発行日

1992

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筑波大学博士 (医学) 学位論文・平成4年3月25日授与 (甲第1032号)

著者

OYAMA Yukio YAMAGUCHI Seiya MAEKAWA Hiroshi

出版者

Atomic Energy Society of Japan

雑誌

Journal of Nuclear Science and Technology (ISSN:00223131)

巻号頁・発行日

vol.25, no.5, pp.419-428, 1988

被引用文献数

5

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Angular neutron fluxes leaking from the surface of lithium-oxide and graphite slab assemblies have been measured with irradiation of D-T neutrons. The spectrum measurement was performed using the time-of-flight technique with an NE213 scintillation detector. The thicknesses of the slabs were 0.6 to 5 mean free path for 14.8 MeV neutrons, and the measured leaking angles of the angular fluxes were 0.0°, 12.2°, 24.9°, 41.8° and 66.8°. The experimental results have been compared with the results calculated by the continuous energy Monte Carlo transport code MCNP, using the data in the JENDL-3PR1, -3PR2, and ENDF/B-V nuclear data files. The comparisons between the experimental and calculated results show that the data of <SUP>7</SUP>Li in JENDL-3PR2 is improved for the secondary emission spectra of the 4.63 MeV level and (n, 2n) reactions; the angular distributions of 3rd- and 4th-level inelastic reactions of C in the JENDLs are questionable. The thickness dependences for high energy neutrons also suggest that the total cross section of <SUP>7</SUP>Li and the elastic cross sections of C are slightly inadequate.

著者

Sato Satoshi Verzilov Yury Ochiai Kentaro WADA Masayuki KUTSUKAKE Chuzo TANAKA Shigeru ABE Yuichi SEKI Masakazu OGINUMA Yoshikazu KAWABE Masaru NISHITANI Takeo KONNO Chikara

出版者

Atomic Energy Society of Japan

雑誌

Journal of nuclear science and technology (ISSN:00223131)

巻号頁・発行日

vol.44, no.4, pp.657-663, 2007-04-25

著者

斎藤 文紀

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.98, no.3, pp.350-365, 1989

被引用文献数

25 16

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The criteria for the classification of present shelf sediments are summarized, and the classification of sedimentary environments and the facies of their sediments in a stormdominated shelf are presented.<BR>The present shelf sediments are classified by the seven criteria as follows.(1) Are the sediments modern or relict? and when were the sediments supplied? (2) Are the sediments palimpsest or not? (3) By which kind of physical processes were they deposited? (e. g. density currents, flood, tidal currents, geostrophic currents, oceanic currents, tsumanis, etc.)(4) What type of sedimentary environment? (e. g. foreshore, shoreface, inner shelf, outershelf, etc.)(5) What is the grain size? (6) What is the natur e of the constituents? (e. g. authigenic, biogenic, volcanic, clastic, etc.)(7) What is the sedimentary structure or bedform of the sediments? These classification criteria of the present shelf sediments are the key to the interpretation of the environment of ancient sedimentary rocks.<BR>The storm-dominated and siliciclastic shelf sediments are divided into nearshor e (foreshore and shoreface), inner shelf and outer shelf facies. Foreshore is the zone of beach and the facies is characterized by well-sorted sand and seaward dipping, low-angle wedge-shaped cross- or parallel-bedding. Upper shoreface is the zone in which longshore bars and troughs are recognized within water depth of less than about 6m, and the facies consists of coarse to pebbly sand with cosets of high -angle tabular or trough cross-bedding of 10 to 100cm thickness. Lower shoreface is the zone which is between 6 to about 20m of water depth, and the facies is comprised of well-sorted fine to very fine sand with amalgamated hummocky cross- or parallel-stratification. Inner shelf is the zone which ranges from 20 to about 70m of water depth, and the facies is made up of interbedded sand and mud. Also, hummocky cross-stratification is recognized in the sand beds deposited in a zone less than about 50m of water depth. Outer shelf is the zone below about 70m of water depth, and the facies is composed of bioturbated mud. The boundary between shoreface and innershelf corresponds to the mean fairweather wave base and the boundary between inner shelf and outer shelf to the mean storm wave base.

著者

藤田 喜久

出版者

社団法人日本産科婦人科学会

雑誌

日本産科婦人科學會雜誌 (ISSN:03009165)

巻号頁・発行日

vol.21, no.12, pp.1377-1386, 1969-12-01

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妊婦尿中に著増するestrogenは胎児副腎から分泌されるdehydroepiandrosterone(以下DHEAと略す)を材料として胎盤で主として産生される.このDHEAの胎児副腎からの分泌調節機序解明の為,生後数日間の新生児にACTH,HCG,dexamethasoneなどを負荷し,その前後の尿中DHEAの排泄量及びPorter-Silber chromogen(以下PSCと略す)排泄量をも測定し,比較検討した.DHEAの測定法についてはColasの方法にアルカリ洗浄による尿色素の除去及びisotope dilution法を導入改良検討してその精度を高めることが出来た.即ち本法による最低測定限界は5μg,回収率は80%であつた.薄層クロマト上のRf値及び硫酸発色による吸収spectrumの検定によりDHEAであると同定した.本実験結果から1)新生児の尿中DHEA及びPSC排泄量は出生後数日間は余り変化がなく,この時期では副腎胎児層の退縮はいまだ軽微であることが示唆された.2)ACTH投与群ではDHEA測定値は222μg/dayより939μg/day(P>0.06)に,PSCは224μg/dayより1451μg/day(P>0.02)といずれも著増な示し,dexamethasone投与群ではDHEAは279μg/dayより63μg/day(p>0.02)と著減し,PSCも270μg/dayに比し162μg/day(P>0.06)と減少した.これらのことから,胎児副腎の内分泌機能はACTHの調節下にあるものと思われ,HCGに関しては投与前後において両ステロイド共変化がみられなかつたことから,その調節因子としての意義を持たないことが示唆された.

出版者

Faculty of Engineering, Okayama University

雑誌

Memoirs of the Faculty of Engineering, Okayama University (ISSN:04750071)

巻号頁・発行日

vol.38, no.1, pp.39-59, 2004-03

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We investigate the meaning of "statistical methods" for geometric inference based on image feature points. Tracing back the origin of feature uncertainty to image processing operations, we discuss the implications of asymptotic analysis in reference to "geometric fitting" and "geometric model selection", We point out that a correspondence exists between the standard statistical analysis and the geometric inference problem. We also compare the capability of the "geometric AIC" and the "geometric MDL' in detecting degeneracy. Next, we review recent progress in geometric fitting techniques for linear constraints, describing the "FNS method", the "HEIV method", the "renormalization method", and other related techniques. Finally, we discuss the "Neyman-Scott problem" and "semiparametric models" in relation to geometric inference. We conclude that applications of statistical methods requires careful considerations about the nature of the problem in question.