検索条件

閉じる

検索結果 18371 件

JaLCDOI 10.18926/fest/11556
フルテキストURL 003_011_024.pdf
著者 渡辺 雅二|
抄録 We study a system that models a problem in which an oscillatory unit is coupled to a passive medium. We analyze the case in which an RCL circuit is coupled to an RC circuit. Some numerical results indicate when slow oscillations occur in coupled systems.
キーワード coupled circuits Van der Pol's equation slow oscillations
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1998-01-14
3巻
1号
開始ページ 11
終了ページ 24
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313697
JaLCDOI 10.18926/fest/11552
フルテキストURL 003_001_003.pdf
著者 中島 惇|
抄録 The existence of a derivation in a near-ring is not known. We construct derivations on 2×2 matrix near-ring in the sense of [MW].
キーワード Near-ring matrix near-ring derivation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1998-01-14
3巻
1号
開始ページ 1
終了ページ 3
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313635
JaLCDOI 10.18926/fest/11548
フルテキストURL 005_001_006.pdf
著者 石川 洋文| 石井 明| 金子 明|
抄録 We have estimated the degree of transmission of Plasmodium vivax malaria in Vanuatu Islands, eastern Melanesia with the aid of the computer simulations, which has been carried out on the platform of a mathematical transmission model. The malaria caused by Plasmodium vivax has a relapse character, which arises from hypnozoites in the liver. This phenomen makes a malaria control strategy difficult. When the mass drug administration is executed, the prevalence of Plasmodium vivax decreases moderately as compared with that of Plasmodium falciparum, and it recovers before long being affected by the relapses. The simulations suggest that one cannot attain the eradication of Plasmodium vivax malaria without the concentrated execution of the mass drug administration and the vector control that fairly reduces the vactorial capacity.
キーワード Plasmodium vivax computer simulation hypnozoite mass drug administration relapse
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 1
終了ページ 6
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313438
JaLCDOI 10.18926/fest/11546
タイトル(別表記) A Case Study on How to Teach English at University Adopting TOEIC
フルテキストURL 006_107_118.pdf
著者 諸川 重剛| 神崎 謙一| 荻野 勝|
抄録 We tried an experiment to see whether or not it was possible to teach English considering the rising emphasis on TOEIC. Each of the three of us was in charge of five lessons out ot fifteen. One taught a section in listening in a language laboratory, another taught a section in grammer and vocabulary, the third taught a section in reading. There was no exam at the end of the semester, but mini-TOEIC tests were administered, and taking the TOEIC was mandatory. Students were evaluated on both their mini-tests and their TOEIC scores. Student evaluations reflected a positive attitude toward the course. Most students favored the standard of TOEIC as a test of course evaluation. Although we realize there are aspects to be improved (i.e., students' listening ability, class-time efficiency), we should continue to develop English ability focusing on the internationally established medium, TOEIC.
キーワード TESOL at university teaching English adopting TOEIC team teaching experimental program
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 107
終了ページ 118
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313643
JaLCDOI 10.18926/fest/11543
タイトル(別表記) Fertilizer Microencapsulated with Biodegradable Polymer
フルテキストURL 007_127_131.pdf
著者 二木 栄| 吉澤 秀和| 松尾 充記| 楠本 昌彦| 北村 吉朗|
抄録 Many fertilizers are soluble in water, therefore their effect does not last for long time after fertilizing in soils. The nitrogenous fertilizers such as urea transported to groundwater cause serious agricultural contamination and health problems. To solve these problems, sustained release of fertilizer has attracted much attention. In this study, we attempted to prepare polylactide microcapsules with fertilizer by phase separation technique, which was a method of microencapsulation. Polylactide (PLA) was used as a biodegradable polymer bacause the biodegradable polymer has no influence on the soil and the ecosystem. The effect of preparation conditions such as stirring time and fertilizer concentration on morphology of microcapsule and on cumulative percentage released of enclosed urea was also investigated.
キーワード fertilizer polylactide microcapsule controlled release phase separation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 127
終了ページ 131
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313894
JaLCDOI 10.18926/fest/11542
タイトル(別表記) Preparation and In Vitro Release Property of PLA Microspheres Enclosing Antitumor Agent
フルテキストURL 006_103_106.pdf
著者 西野 悟| 吉澤 秀和| 夏越 祥次| 愛甲 孝| 幡手 泰雄| 北村 吉朗|
抄録 Recently, many antitumor agents developed. Irinotecan hycrochloride (CPT) has a great side effect even though it is well effective against the cancer. Drug delivery system (DDS) medicine indicates that the release rate of medicine is constant for a long time. Therefore, in order to materialize the general idea of DDS, we applied microencapsulation technique to prepare biodegradable polymer microspheres (MS) enclosing antitumor drug having no side effect. Polylactide microparticles enclosing antitumor agent were prepared by solvent evaporation method under various operation conditions. The effects of operation parameter on release rate of drug and morphology of microparticles were studied.
キーワード DDS microparticle polylactide antitumor agent solvent evaporation DSC
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 103
終了ページ 106
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002314051
JaLCDOI 10.18926/fest/11539
タイトル(別表記) One-dimensional Compression Tests of Sludge Cake from Dredged Sludge
フルテキストURL 006_085_097.pdf
著者 脇谷 芳招| 藤井 弘章| 西村 伸一| 井上 隆司|
抄録 One-dimensional compression tests were performed to investigate compression characteristics of sludge cake used as a construction material. The sludge cake is dewatering product of dredged sludge from the bottom of a lake. The test results show following compression characteristics. (1) For the undisturbed samples, e-log p curves show compressibility of overconsolidated clay ordinatily observed. (2) For the disturbed samples, there observed compressibility close to that of ordinary normally consolidated clay. (3) For the recompressed samples, there observed two turning points on e-log p curve. The compression presures(p(c1) and p(c2)) at those points for the unsubmerged tests have a linear correlation with the recompression pressure(p(s)). The submerged tests give very small values of p(c1) and p(c2) compared with the case of unsubmerged test. (4) For the recompressed samples, the first compression index(C(c1)) after p(c) has a linear correlation with the initial void ratio(e(0)), and the second compression index(C(c2)) shows almost constant value.
キーワード sludge cake one-dimensional compression test e~log p curve compression index void ratio
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 85
終了ページ 97
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313853
JaLCDOI 10.18926/fest/11538
タイトル(別表記) Effects of ultrasonic treatment on the preparation of transparent glass-ceramic phosphor
フルテキストURL 007_113_118.pdf
著者 井上 輝英| 中島 瑞穂| 難波 徳郎| 三浦 嘉也|
抄録 The effects of ultrasonic surface treatment (UST) on the crystallization behavior and optical emission properties were investigated for the transparent glass-ceramics prepared from calcium aluminosilicate glasses co-doped with Eu(2+), Nd(3+). The glass-ceramics A were prepared by sintering a glass 45CaO・45Al(2)O(3)・10SiO(2) (mol%) containing 0.5Eu(2)O(3)+1Nd(2)O(3) under a 2% H(2)+98% Ar reducing atmosphere. In the glass-ceramics A, three crystalline phases, CaAl(2)O(4) (CA), CaAl(4)O(7) (CA2) and Ca(2)Al(2)SiO(7) (CAS) were commonly confirmed by X-ray diffraction. No drastic change in the amount of the precipitated crystalline phases was observed even in the case using UST of CA powders. It was suggested that the optical emission properties of the glass-ceramics A was responsible for the CA2 crystals. The glass-ceramics B were also prepared from a 51CaO・42Al(2)O(3)・7SiO(2) glass. The CA crystals were separately precipitated in the glass-ceramics B. In particular, a large amount of CA was successfully produced by stirring the UST suspension to prevent the sedimentation of the UST particles. The glass-ceramic B so-prepared showed strong photoluminescence but weak phosphorescence compared with other glass-ceramics B, indicating that the photoluminescence and phosphorescence were originated in different electron-trapping levels. The amount of the trap levels associated with the long lasting phosphorescence, such as oxygen vacancies, was probably small in the glass-ceramic B prepared with the stirring UST.
キーワード ultrasonic surface treatment (UST) surface crystallization glass-ceramics long lasting phosphorescence calcium aluminosilicate glass
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 113
終了ページ 118
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313433
JaLCDOI 10.18926/fest/11534
フルテキストURL 007_099_106.pdf
著者 Kamboh Maqsood Ahmed| 沖 陽子| 足立 忠司|
抄録 A few wheat varieties including two Japanese wheat varieties were evaluated for their salt tolerance at seeding stage, their behavior to increasing salinity levels and role of Na exclusion capacity in salt tolerance mechanisms. The wheat varieties were grown in nutrient solution and subjected to 0 (control), 25,75 and 125 mM NaCl salinity levels for 7 days. Although the shoot growth was reduced while Na contents were increased progressively with increasing salinity in all varieties, the varieties were quite different in their response. Salt tolerant va rieties maintained less reduction in their root and shoot growth and better water relations in their shoots than salt sensitive varieties under saline conditions. The wheat varieties were quite different in their Na exclusion capacity. Poor growth in salt sensitive varieties might be due to higher accumulation of Na in their shoots resulting from low Na exclusion capacity of roots, higher Na transport to shoot and/or inferior compartmentation capability.
キーワード growth and mineral composition increasing salinity Na exclusion capacity salt tolerance wheat varieties
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 99
終了ページ 106
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313704
JaLCDOI 10.18926/fest/11533
タイトル(別表記) Management of Rural Region in Association with Its Regionality of the Western Part of Tottori Prefecture
フルテキストURL 006_053_065.pdf
著者 市南 文一|
抄録 In this paper the brief history, the status quo and the problem of regional management in association with its regionality were examined in Yodoe town and Mizokuchi town in the western part of Tottori Prefecture. These areas have the focus of Yonago city. Mt. Daisen and Kaike-spring have been well-known, and Tottori Flower Park recently attracts many tourists. However, agriculture also flourishes remarkably in these areas. Although Yodoe town has been celebrated for the waters and traditional umbrella, the town management recently makes the most of acorn and ancient tombs, giving emphasis to international relations and history. In Mizokuchi town the oldest legend of ogre has been investigated intently and the town management in connection with it has been proceeded. As these plannings use their histories and features peculiar to the area as a management concept, they have high originality. As a future problem, it may be necessary to built up a closer connection and coordinate each regional functions within the extensive areas.
キーワード The Western Part of Tottori Prefecture Rural Area Regionality Regional Coordination of Functions
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 53
終了ページ 65
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002314021
JaLCDOI 10.18926/fest/11532
フルテキストURL 007_091_098.pdf
著者 Kamboh Maqsood Ahmed| 沖 陽子| 足立 忠司|
抄録 To evaluate hypoxic-salinity tolerance in wheat varieties, three Japanese varieties (Nourin-61, Chikugo Izumi and Shirasagi Komugi, relatively salt tolerant) and one Pakistani variety (Blue Silver, relatively salt sensitive) were grown under control, hypoxia, saline and hypoxic-saline conditions. The results suggested that relatively hypoxia and salt tolerant variety Nourin-61 was capable of producing the highest relative shoot yield under combined stress conditions. On the other hand, relatively sensitive variety to both hypoxia and salinity conditions, could not withstand harmful effects of combined stress. A more close correlation of plant growth characters between salinity and hypoxic-salinity than hypoxia and hypoxic-salinity indicated that varieties with higher salt tolerance would suffer less than varieties with higher hypoxia tolerance under combined stress conditions. And the balance of Na/K ratio in shoot tissues seems to be the major evaluation factor as the tolerant variety when salinity and hypoxia stress occur together.
キーワード hypoxia growth and ionic composition salinity salt tolerance wheat varieties
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 91
終了ページ 98
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313980
JaLCDOI 10.18926/fest/11531
フルテキストURL 006_047_052.pdf
著者 小松 満| 西垣 誠|
抄録 For evaluating subsurface contamination, sampling method (boring) is commonly used, but this method cannot monitor the change of in-situ contamination and concentration with respect to time. The purpose of this study is to develop a measuring system for subsurface contamination in which a so-called FDR-V system (Frequency Domain Reflectometry with Vector network analyzer) was employed to measure the salinity contaminant. This FDR-V method is a coaxial probe method,which allows the measurement of the complex dielectric constant from 1GHz to 18GHz. The experimental study indicates the possibility in measuring both the salinity concentration and volumetric moisture content.
キーワード Dielectric constant Subsurface Salinity concentration Volumetric moisture content
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 47
終了ページ 52
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313354
JaLCDOI 10.18926/fest/11529
フルテキストURL 006_041_045.pdf
著者 Adam Ihab| 阪田 憲次| 綾野 克紀|
抄録 Inclusion of aggregates leads to a reduction in drying shrinkage of cement paste. This is due to the elastic deformation of the aggregates that partly restrains the shrinkage deformation of cement paste. Hence, concrete with higher aggregate content exhibits smaller shrinkage. In addition, concrete with aggregates of higher modulus of elasticity or of rougher surfaces is more resistant to shrinkage process. In this paper the effects of the type of coarse aggregate on the shrinkage of normal and high-strength concretes are investigated. Two different types of crushed stone were used as coarse aggregates to produce the concrete mixtures used in this study. For each coarse aggregate type, two normal-strength concrete (NSC) mixtures and two high-strength concrete (HSC) mixtures were prepared. The 28-day compressive strength values of NSC mixtures were about 35 and 50 MPa, while those of HSC mixtures were 70 and 100 MPa, respectively. All shrinkage specimens were cured in water for 14 days after casting, then exposed to drying under the conditions of constant temperature (20℃) and relative humidity (60%). It has been shown that the type of the coarse aggregate influences shrinkage behaviour of both normal and high-strength concretes.
キーワード Shrinkage Coarse aggregate High-Strength Concrete Silica Fume
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 41
終了ページ 45
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313637
JaLCDOI 10.18926/fest/11528
タイトル(別表記) Damage factors analysis for small embankment dams due to the Hyogoken-Nambu earthquake special to Hokudan Town
フルテキストURL 007_055_074.pdf
著者 藤井 弘章| 国政 華奈| 難波 明代| 横溝 隆之| 西村 伸一| 島田 清| 堀 俊男| 西山 竜朗| 脇谷 芳招|
抄録 This study was performed to clarify which factors affected damage to take-ike (small embankment dams for irrigation in Japanese) of Hokudan Town on Awaji Island in western Japan due to Hyogoken-Nambu earthquake. Multivariate and ordinary statistical analysis were carried out using documentary data (181 damaged and 328 undamaged dams), and ordinary one was done for the results investigated in situ. The model for the multivariate analysis was created with 13 items and 94 categories for 4 groups (Location, Geology Structure, and History of Dam). As a result, the factors causing to damage for dam are (1) the nearest fault (Nojima, Mizukoshi and D2), (2) embankment volume (the larger the more), (3) angle of crest axis to epicenter (diagonal and normal), (4) distance to the nearest fault (less than 500 m), (5) distance to the epicenter (8 to 14 km which almost agree to the location of seismic intensity 7 JMA), (6) play view of dam axis (3 or 4 axes), (7) angle of crest axis to nearest fault (diagonal and normal), (8) elevation of dam site (over 100 m), (9) surface geology of dam site (non-cohesive soil), (10) era of construction (prior to 1891), and (11) soil properties of embankment (constructed of sand, smaller penetration resistance).
キーワード Earth dam earthquake damage site investigation statistical analysis case study
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 55
終了ページ 74
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002314039
JaLCDOI 10.18926/fest/11525
タイトル(別表記) A Study on Influence of Current Velocity on Phytoplankton
フルテキストURL 007_045_053.pdf
著者 季 勁松| 河原 長美| 小野 芳朗|
抄録 The main problems caused by eutrophication result from the increase of phytoplankton. Therefore, controlling the increase of phytoplankton is the most important. In this study, we discuss the influence of current velocity on the growth of phytoplankton based on the field experiments and laboratory experiments. The laboratory experiments for the influence of current velocity on the growth have been conducted using circular channels, and the field experiments were conducted using a shallow pond. The results of the experiments show current velocity inhibits the growth of phytoplankton.
キーワード Eutrophication growth of phytoplankton influence of current velocity experiment
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 45
終了ページ 53
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313529
JaLCDOI 10.18926/fest/11524
タイトル(別表記) Speeds of travelling wave solutions in a mathematical model of some infectious disease in predator-prey system
フルテキストURL 006_017_023.pdf
著者 梶原 毅| 沖田 知毅|
抄録 In this paper we construct a simple mathematical model for infectious disease in a pradator-prey system, and study the speeds of travelling wave solutions of this model. We present a method of estimation of speeds and make a numerical study about this matter.
キーワード Travelling wave Infectious disease
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 17
終了ページ 23
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313731
JaLCDOI 10.18926/fest/11523
フルテキストURL 007_039_044.pdf
著者 渡辺 雅二|
抄録 We present some results of a finite element analysis for an unsteady flow in Kojima Lake. We also present an experimental result. The global positioning system was utilized in the experiment in order to record the temporal and the spatial data of a float traveling with the driving force of the fluid resistance. The spatial and temporal data were recorded to examine their correspondence with analytical results.
キーワード lake flow numerical simulation finite element method global positioning system
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 39
終了ページ 44
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313386
JaLCDOI 10.18926/fest/11522
フルテキストURL 006_011_015.pdf
著者 渡辺 雅二| 國貞 茂幸|
抄録 The global positioning system is utilized in lake flow analysis to facilitate experimental evaluation for numerical results of a lake flow simulation. In our lake flow experiment a float travels on the lake surface receiving the fluid resistance due to lake flow, while a global positioning system receiver keeps track of its position. A momentum equation is derived when the product of the float mass and its acceleration is set equal to the driving force. The temporal change in the position of the float can be simulated when numerical solutions of lake flow equations are given. A comparison of numerical results and experimental data leads to an evaluation of the numerical simulation of lake flow.
キーワード lake flow numerical simulation GPS-float finite element method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 11
終了ページ 15
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313583
JaLCDOI 10.18926/fest/11521
フルテキストURL 007_031_038.pdf
著者 張 方紅| 田中 豊|
抄録 Relationship has been discussed by Tanaka and Zhang(1999) between the sensitivity analyses based on influence functions and on Cook's local influence, and it has been shown that equivalent results are obtained under general conditions by these analyses in statistical modeling without/with equality constraints. However, a condition implicitly assumed in the proof in Tanaka and Zhang(1999) in the case with equality constraints does not necessarily hold. The present paper gives a complete proof without assuming the condition. Also a formula for the normal curvature is derived for the convenience of practical computation.
キーワード Local influence influence function equality constraints
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 31
終了ページ 38
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313336
著者 長谷川 浩一|
発行日 2007-03-23
出版物タイトル
資料タイプ 学位論文