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JaLCDOI 10.18926/fest/11571
フルテキストURL 005_081_098.pdf
著者 Magda Waldemar| 前野 詩朗| 名合 宏之|
抄録 A dynamic response of a submarine pipeline buried in sandy seabed sediments to water loading generated by harmonically oscillating water-table vertical movements is examined in the present report experimentally and numerically. The aim of small-scale laboratory experiments was: (1) to record time-histories of pipeline vertical displacements, and (2) to observe a shape of slip surface of an overburden sand body involved in breakout together with the pipeline. A parametric study was carried out in order to investigate the influence of two meaningful factors, that is the depth of burial and the specific gravity of pipeline, on a gradual upward displacement of the pipeline. Based on a numerical finite-element 2D-analysis of the hydrodynamic pore pressure and effective stresses oscillations in the pipeline vicinity, an analysis of the pipeline stability potential is presented, in which all the experimental cases tested are verified. All important component forces (e.g., hydrodynamic uplift force) associated with floatation phenomenon of the buried submarine pipeline are considered and quantified.
キーワード submarine pipeline surface waves pore pressure floatation stability
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
巻 5巻
号 1号
開始ページ 81
終了ページ 98
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313700
JaLCDOI 10.18926/fest/11570
フルテキストURL 003_105_120.pdf
著者 Kidtimonton Surasri| 三野 徹|
抄録 Two optimization models are formulated based on different objectives for assisting the irrigation planner in making decision on agricultural planning during drought year. The sensitive degree of water shortage area in the irrigation project are classified by those models. They are solved by simplex method. Firstly, the Two-phase method is applied to analyze the artificial variables in the formulated model. Then, the formulated model is modified after getting rid of the artificial variables to obtain the feasible solution. The agricultural planning is planned by considering the classified area with social equity and economic improvement. Crop diversification is introduced to conduct in the very sensitive water shortage area and intermittent irrigation system is introduced to operate in the moderately sensitive water shortage area. The integrated farming system, the separation of land owner and cultivator and the disposition of substitute lots system are also suggested to conduct in this study project.
キーワード agricultural planning Two-phase method integrated farming sensitive water shortage disposition of substitute lots 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 1998-01-14
巻 3巻
号 1号
開始ページ 105
終了ページ 120
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313819
JaLCDOI 10.18926/fest/11568
フルテキストURL 003_097_104.pdf
著者 Hassan Muhammad Qumrul| 大久保 賢治|
抄録 Surface air temperature distribution over the Ganges Delta Region of southwest Bangladesh and its tendency of warming are discussed through the analyses based upon the long-term temperature data from 1900-93. The data consist of two parts corresponding to the time-periods: 1973-93 and 1900-72. The study area is one of most affected places by the annual monsoon hydrological cycle and the present observation from these temperature data indicate that the surface air temperature gradient in the north-south direction is significant in the rainy season and that the temperature of the region is at an increasing tendency; the warming rate during the data periods (1900-93) on the long-term mean annual basis is estimated as 0.77℃ at Satkhira of the Khulna division and 0.29℃ as an areal average including the Barisal division, for the time difference of about half a century between the data periods before and after 1972.
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
巻 3巻
号 1号
開始ページ 97
終了ページ 104
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313675
JaLCDOI 10.18926/fest/11567
フルテキストURL 003_075_095.pdf
著者 Magda Waldemar| 前野 詩朗| 名合 宏之|
抄録 The response on sandy seabed sediments to a harmonically oscillating water-table, with a special consideration of the wave-induced pore-pressure oscillations around a pipeline buried in seabed sediments, is studied in the present work experimentally and numerically. The aim of the analysis was: (1) to observe a true distribution pattern of the wave-induced pore-pressure oscillations acting on the pipeline outer surface, and (2) to verify small-scale test results using numerical computations performed for a wide range of saturation conditions of seabed sediments, under the assumption of a compressible two-phase medium compound of the pore-fluid and soil skeleton, as well as a finite thickness of a permeable seabed layer.
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
巻 3巻
号 1号
開始ページ 75
終了ページ 95
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313821
JaLCDOI 10.18926/fest/11561
フルテキストURL 005_035_046.pdf
著者 崔 承培| 田中 豊|
抄録 Spatial data is analyzed in three stages of 1) estimating the variograms, 2) fitting a model for the estimated variograms and 3) predicting the value at unknown location based on the information at known locations (kriging). Recently, it has become a subject of interest to detect influential observations in these stages. Choi and Tanaka(1999) have derived influence functions in the above three stages and have proposed sensitivity analysis procedure. So far influence functions have only been derived for variograms by Gunst and Hartfield(1996). The present article makes a comparison of the performances between those influence functions for variograms derived by Choi and Tanaka(1999) and by Gunst and Hartfield(1996). A real numerical example is given to discuss the validity or usefulness of those influence functions.
キーワード Stationary spatal data Influence function Sample variogram Median-polish residual
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
巻 5巻
号 1号
開始ページ 35
終了ページ 46
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313332
JaLCDOI 10.18926/fest/11559
フルテキストURL 005_031_034.pdf
著者 渡辺 雅二|
抄録 We study unsteady flow that models lake flow in Kojima Lake. We assume that a lake is connected to another area with gates, and that those gates are opened when the water level outside the gates is lower than the water level of the lake. We study unsteady flow due to the opening of the gates. We analyze the problem with the finite element method, and take detailed structures of the gates into account.
キーワード unsteady flow lake flow 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 2000-02-29
巻 5巻
号 1号
開始ページ 31
終了ページ 34
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313848
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
巻 3巻
号 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/11555
タイトル(別表記) Simulations of Heel Impact by Viscoelastic Models
フルテキストURL 005_013_021.pdf
著者 小久保 雅仁| 佐々木 徹|
抄録 The purpose of this study is to make some body models with viscoelastic model, to simulate the heel impact and to obtain the ground reaction force. In this paper, we build up body models of linear viscoelastic elements and mass elements to simulate heel impact. Here we consider the systems of linear differential equations numerically for the preparation of mathematical analysis in future. The simplest model with two mass elements is hardly able to simulate the heel impact if the rate of mass of elements is realistic. The models with more elements are suitable to simulate for actual rate of weight of body segments. The model with three mass elements makes it possible to guess the force to each body segment.
キーワード Running Heel Impact Viscoelastic Model Biomechanics
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
巻 5巻
号 1号
開始ページ 13
終了ページ 21
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313531
JaLCDOI 10.18926/fest/11554
フルテキストURL 003_005_009.pdf
著者 石川 洋文|
抄録 We investigate the Maass wave form for Γ(0)(2) whose eigenvalue of Laplacian Δ is 1/4-π(2)/log(2)(√2-1). In this note, we study the methods of calculation of its Fourier coefficients and carry out the numerical calculations.
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
巻 3巻
号 1号
開始ページ 5
終了ページ 9
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313535
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
巻 6巻
号 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
巻 7巻
号 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
巻 6巻
号 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/11540
タイトル(別表記) Formation of Crosslinked Polyurea Membrane by Phase Separation Method
フルテキストURL 006_099_102.pdf
著者 小林 栄次| 吉澤 秀和| Jacobson Joseph| 北村 吉朗|
抄録 This research was conducted to clarify the membrane formation mechanism of crosslinked polyurea microcapsules by phase separation method, specially the role of polymeric surfactant of poly(ethylene-alt-maleic anhydride),(poly(E-MA))at the interface of O/W emulsion. Because of its toxicity, alternative chemicals should be chosen. This understanding may make possible to find the alternative chemicals. It was found that poly(E-MA)was necessary for the formation of crosslinked polyurea membrane. The addition of sodium dodecyl sulfate (SDS) prohibited the membrane formation reaction at the interface, even in the care of poly(E-MA) concentration enough for polymeric microcapsule formation. From the results in this study, poly(E-MA) as polymeric surfactant was found to be adsorbed on the interface of O/W emulsion and provide the reaction site for the membrane formation of polymeric microcapsules.
キーワード microcapsulation O/W emulsion polyurea polymeric surfactant
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
巻 6巻
号 1号
開始ページ 99
終了ページ 102
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 120002313844
JaLCDOI 10.18926/fest/11535
フルテキストURL 006_067_079.pdf
著者 Kamboh Maqsood Ahmed| 沖 陽子| 足立 忠司|
抄録 The distribution on Ca, K, Na and Cl in root and leaves was studied in salt tolerant variety (Chikugo Izumi) and salt sensitive variety (PB-81) of wheat under saline conditions. The plants grown in 5% Hoagland's nutrient solution were subjected to 100 mM NaCl salinity for one week before observation with scanning electron microscope and analysis of selected samples with X-ray microanalyzer. Root growth was not affected in salt tolerant variety but reduced significantly in salt sensitive variety. Shoot growth was reduced in both varieties but much higher in salt sensitive variety. Salinity increased accumulation of Na and Cl in all root cells including vascular cells in salt sensitive variety. Salt tolerant variety not only reduced uptake of Na and Cl under saline conditions but also restricted their accumulation in cortex maintaining vascular cells relatively free of these ions. Salt sensitive variety failed to block transport of Na and Cl from root to leaves leading to much accumulation of these ions in leaves under salinity sterss.
キーワード Ion distribution salinity salt tolerance wheat varieties X-ray microanalysis
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
巻 6巻
号 1号
開始ページ 67
終了ページ 79
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313904
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
巻 6巻
号 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
巻 6巻
号 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
巻 7巻
号 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/11526
フルテキストURL 006_025_034.pdf
著者 山西 芳裕| 田中 豊|
抄録 In functional principal component analysis (PCA), we treat the data that consist of functions not of vectors (Ramsay and Silverman, 1997). It is an attractive methodology, because we often meet the cases where we wish to apply PCA to such data. But, to make this method widely useful, it is desirable to study advantages and disadvantages in actual applications. As alternatives to functional PCA, we may consider multivariate PCA applied to 1) original observation data, 2) sampled functional data with appropriate intervals, and 3) coefficients of basis function expansion. Theoretical and numerical comparison is made among ordinary functional PCA, penalized functional PCA and the above three multivariate PCA.
キーワード Functional data Multivariate data Principal component analysis Eigenvalue Eigenvecotor
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
巻 6巻
号 1号
開始ページ 25
終了ページ 34
ISSN 1341-9099
言語 英語
論文のバージョン publisher
NAID 120002313939
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
巻 7巻
号 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
巻 6巻
号 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