検索結果 13397 件
| JaLCDOI | 10.18926/fest/12836 |
|---|---|
| フルテキストURL | 13_111_119.pdf |
| 著者 | Akhtar M.Shahbaz| 沖 陽子| 足立 忠司| |
| 抄録 | To acclimate under orthophosphate (Pi) starved environment, plant species and cultivars display an elegant myriad of Pi-adaptive and rescue responses via reprioritizing internal Pi use and maximizing external Pi acquisition by reprogramming metabolism and restructuring root system architecture.Exploitation of considerable genetic diversity both between and within crop species and harnessing of these genetic variations can lead us to develop smart plants with improved P-acquisition, growth and yield under P-deprivation. To elucidate the effect of P-stress on plant growth, and P-efficiency under Pstarvation, 14 diverse Brassica cultivars were grown hydroponically in a climatically controlled chamber using sufficient (200 and 400 μM) and stress (10 and 20 μM) P-levels using ammonium phosphate (NH4H2PO4) as a P source. Cultivars showed differential growth behaviour in terms of biomass accumulation (shoot and root dry matter partitioning), percent distribution of Pi-concentration ([P]) and P-contents in plant parts (roots and shoots), and P-efficiency ratio (% PER)(relative shoot growth) indicating considerable genetic diversity among the tested Brassica cultivars. PER and the proportional increases in shoot dry matter (SDM) accumulation (SDMmax/SDMmin) in response to the P levels assisted in categorizing the cultivars into efficient and inefficient utilizers of the absorbed P from an ambient environment. Cultivars were classified into efficient responsive (ER), efficient non-responsive (ENR), non-efficient responsive (NER) and non-efficient non-responsive (NENR) by plotting ordination plots between PER and SDMmax/SDMmin under P-stress environment. Differential PER values at stress P levels corresponds to high P levels suggest that P efficiency mechanisms can be different from one cultivar to another within a give plant species and cultivars exhibiting high PER values are better choice to thrive under P-starvation. |
| キーワード | Brassica cultivars biomass and P-distribution P-contents P-efficiency 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 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 111 |
| 終了ページ | 119 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304774 |
| JaLCDOI | 10.18926/fest/12835 |
|---|---|
| フルテキストURL | 13_103_109.pdf |
| 著者 | Khan Md. Harunor Rashid| Kabir Syed Monzur| Bhuiyan Md. Mukaddas Ali| Blume Hans-Peter| |
| 抄録 | A simulation study was conducted to evaluate the effects of basic slag (BS10 and BS20: basic slag 10 and 20 t ha-1), aggregate size (A20 and A30: aggregate sizes of soil, less than 20 and 20-30 mm) and groundwater depth (Gw0: no influence of groundwater and Gw50: groundwater beneath 50 cm of the soil surface) as physico-chemical amendments in two pre-leached (leached for a week through tap water to remove excessive acidity and salinity from the soil before transplantation) acid sulfate soils of Badarkhali (Salidic Sulfaquept) and Cheringa (Typic Sulfic Halaquept) series in relation to the production of Chilli (Capsicum annum L.). Maximum growth and yield of chilli were recorded by the treatment combining A30Gw50BS20 in both the Cheringa (green chilli weight: 4.82 t ha-1) and Badarkhali (4.51 t ha-1) soils. The application of basic slag (BS20) was found to be the most effective among the individual treatments, followed by the BS10 > A30 > Gw50 treatments. The application of BS20 increased the yield in combination with the Gw0 treatment by 40% for A20, while by 107% for A30 in the Badarkhali soil. On the other hand, in the case of Gw50, these increments were 49 and 141% for A20 and A30, respectively. The application of BS at the highest rate (BS20) to the Cheringa soil was more effective compared with the A20 and A30 treatments in the Badarkhali soil. The same rate of BS20 in combination with the Gw50 treatment increased the yield by 59 to 147% in the Cheringa soil compared with 49 to 141% in the Badarkhali soil. Almost similar and significant (p≤0.05) effects were observed for the other growth parameters of chilli cultivated in both soil series. |
| キーワード | aggregate size basic slag groundwater growth and yield of chilli physico-chemical amendments of acid sulfate soils |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 103 |
| 終了ページ | 109 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304787 |
| JaLCDOI | 10.18926/fest/12834 |
|---|---|
| フルテキストURL | 13_097_101.pdf |
| 著者 | Khan Md. Harunor Rashid| Md. Mohiuddin| M. Rahman| |
| 抄録 | Non-symbiotic diazotrophic systems for biological nitrogen fixation (BNF) in agriculture are most promising but the possibility for the extension of nitrogen fixation by rice is still speculative. Accordingly, the present study was conducted for the Enumeration, isolation and identification of nitrogen fixing bacterial strains at seedling stage (30 days after seed sowing) in rhizosphere of rice (BR 10, Oryza sativa L.) grown in Non-Calcareous Grey Flood Plain soil of Bangladesh. The soil is classified as ‘Inceptisol’ order and ‘Aquept’ suborder. It was identified as ‘Dhamrai series’, had ‘silt’ texture, pH 7.1 and 5.5 C/N ratio. The present results of the microbial tests on the rice rhizosphere soil evinced that out of 263 isolates, only 91 were branded as nitrogen fixing organisms per gram of soil, which was about 34.6 % of the total isolates. As per selection criteria, four individual strains were considered for identification. Biochemical tests were conducted for proper identification and the selected strains were identified as Enterobacter spp., Klebsiella spp., Bacillus spp. and Azospirllum spp. |
| キーワード | Azospirllum spp. Bacillus spp. diazotrophs Enterobacter Spp. Klebsiella spp. and Oryza sativa. |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 97 |
| 終了ページ | 101 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304761 |
| JaLCDOI | 10.18926/fest/12833 |
|---|---|
| フルテキストURL | 13_085_095.pdf |
| 著者 | Khan Md. Harunor Rashid| |
| 抄録 | The application of basic slag (BS20 and BS30: basic slag 20 and 30 t ha-1) and aggregate size (A20 and A30: aggregate sizes of soil less than 20 and 20-30 mm) and different techniques (Tech 1: pyrite at top, jarosite at middle, and top soil at the bottom of ridge; Tech 2: top soil at top, pyrite at middle, and jarosite layer at the bottom of ridge) exerted significant (p≤0.05) positive effects on the growth and yield of eggplants cultivated under field condition and the effects varied not only with the kinds and amounts of amending materials but also with the techniques applied. The soil showed a silty clay loam texture, initial pH value of 4.1, pyrite content of 55 g kg-1, base saturation of 47%, ECe value of 3.6 dS m-1, high exchangeable Fe3+ and Al3+ contents of 1.47 and 5.29 cmolc kg-1, respectively. The pH value of the average soil data obtained from all the treatments during fruit set (95 days after transplantation) of eggplants was found to be increased in pH by 1.2 units higher compared with the control (i.e. initial pH value). The contents of P, K, Ca and Mg in the average soil data during fruit set were found to be increased (IOC = increased over control) by 41 to 127% IOC, while the contents of Al3+, Fe3+, Na+, Cl- and SO4 2- in the soil were found to be decreased by 28 to 92% IOC. The different treatments on eggplants grown under the modified-plain-ridge-ditch techniques in the Cheringa acid sulfate soil significantly (0≤0.05) increased the fresh yield of eggplants, and the increment was more pronounced with Tech 2. The maximum yield of 17.8 t ha-1 of eggplant for Tech 1 and 20.1 t ha-1 for Tech 2 were recorded by the application of BS30 in the soils of smaller aggregates (A20) at the ridges of Tech 2, followed by the A30BS30 treatments in both the techniques. The lowest quantity of 1.7 t ha-1 yield was recorded by the control treatment. The eggplants grown in the ridges of both the techniques exhibited the best responses on N, P, K, Ca and Mg contents in eggplant tissues during fruit set. As expected, the lowest contents of these nutrients in the eggplants were recorded in the control treatment. Sulfur content of the eggplants grown in the control plots was 3.6 g kg-1 and was in the range of adequate S content (4 g kg-1). However, the S contents in the eggplants grown in different treatments were significantly (p≤0.01) lower compared with the adequate level. The effectiveness of the treatments for the reclamation of the soil in relation to the growth of eggplants was: Tech 2 > Tech 1, BS30 > BS20, and A20 > A30. The results suggest that the physicochemical properties of the soil, and the growth, yield and nutrition of eggplants were strikingly improved by the application of flash leaching followed by BS30 and A20 treatments in the ridges of Tech 2, and are regarded as the best reclamation measures for this acid sulfate soil. |
| キーワード | aggregate size basic slag growth-yield of eggplant modified-plain-ridge-ditch techniques reclamation and improvement of acid sulfate soil |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 85 |
| 終了ページ | 95 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304770 |
| JaLCDOI | 10.18926/fest/12830 |
|---|---|
| フルテキストURL | 13_067_074.pdf |
| 著者 | Md. Shamin Abul Hasnat| Rashid Khan Md. Harunor| 赤江 剛夫| |
| 抄録 | An incubation study was conducted with the topsoils (depth: 0-20 cm) of two different series namely Cheringa (silty clay loam, pHwater 3.6, electrical conductivity = EC 18.5 dS m-1, CEC 17.2 c mol kg-1, organic matter = OM 39.1 g kg-1, and Badarkhali (silty clay loam, pHwater 3.9, EC 19.0 dS m-1, CEC 18.40 c mol kg-1, OM 30.7 g kg-1) acid sulfate soils to evaluate the effectiveness of basic slag (BS) for the neutralization of acidity and solubility of basic cations. These soils received BS at the rate of 0, 11, 22 and 33 t ha-1 under various moisture regimes (moisture at saturated condition, i.e. 100 % moisture, moisture at field condition, i.e. 50 % and wetting-drying cycles of those 50 and 100 % moisture levels). The impacts of these treatments on some selected properties and changes in water soluble bases in these soils were studied at different periods of 180 days of incubation. The application of BS was found to be increased the pH of soils from 3.6 to 5.1 for Cheringa; 3.9 to 5.2 for Badarkhali soils during the 180 days of incubation. These increments were more striking with the highest doses of BS at 33 t ha-1 under saturated moisture conditions in both the soils. The EC of the soils had not much influenced by the application of BS, regardless of time. The treatments were exerted significant (p≤0.05) effects on the solubility of basic cations in different periods of incubation. The maximum release of the bases were recorded during 180 days of incubation under saturated moisture condition and the findings will be supportive for planning of crop production on these soils. |
| キーワード | acid sulfate soils basic cations basic slag incubation time moisture regimes |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 67 |
| 終了ページ | 74 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304866 |
| JaLCDOI | 10.18926/fest/12829 |
|---|---|
| フルテキストURL | 13_063_066.pdf |
| 著者 | Akudago Apambilla John| 西垣 誠| Chegbeleh Larry Pax| Alim Md. Abdul| 小松 満| 熊丸 耕志| |
| 抄録 | Filters are essential in the design of embankments/dams, drains and wells for water and oil supplies. As a result of these functions, filter use is increasing. In order to use the required filter, various empirical relations have been given based on mathematical and field experience. However, these guidelines have not worked to perfection considering the fact that clogging within the filter face is a serious challenge. A short review on filter design criteria is given in this script coupled with a numerical formulation to propose the design limits. |
| キーワード | filter particle clogging filter classification numerical model equation force of attraction |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 63 |
| 終了ページ | 66 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304909 |
| JaLCDOI | 10.18926/fest/12828 |
|---|---|
| フルテキストURL | 13_057_062.pdf |
| 著者 | Liu Ying| 角田 晋哉| Ceric Majda| 山本 和弘| 渡邊 雅二| |
| 抄録 | Numerical techniques to simulate tsunami waves are described, and numerical results are introduced. A finite difference method is applied to shallow water equations to analize the propagation of tsunami wave. Numerical results to simulate a tsunami wave generated on the Nankai Trough are introduced. |
| キーワード | tsunami finite difference staggered grid leapfrog |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 57 |
| 終了ページ | 62 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304776 |
| JaLCDOI | 10.18926/fest/12827 |
|---|---|
| フルテキストURL | 13_051_056.pdf |
| 著者 | Sanghoon Han| 石岡 文生| 栗原 考次| |
| 抄録 | Echelon analysis (Myers et al., 1997) is a method to investigate the phase-structure of spatial data systematically and objectively. This method is also useful to prospect the areas of interest in regional monitoring of a surface variable. The spatial scan statistic (Kulldorff, 1997) is a method of detection and inference for the zones of significantly high or low rates based on the likelihood ratio. These zones are called hotspots. The purpose of this paper is to detect the hotspot area for spatial data using echelon. We perform echelon analysis for Korea earthquake data. We use ESRI’s ArcGIS that is geographical information system (GIS) software to make the meshed areas and get contiguity information of these areas. With this contiguity information on the meshed areas, we detect the hotspot area using echelon analysis and spatial scan statistics. In addition, we compare with the result of analysis based on the total of number of times simply and the seismic wave energy. |
| キーワード | Hotspot Echelon analysis Spatial scan statistics Seismic Wave Energy |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 51 |
| 終了ページ | 56 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304882 |
| JaLCDOI | 10.18926/fest/12819 |
|---|---|
| フルテキストURL | 13_023_033.pdf |
| 著者 | 銭花 知弘| 久兼 直人| 森本 智子| 石川 洋文| |
| 抄録 | We carried out simulations of various scenarios for bioterrorist attacks using smallpox occurring in a virtual area set up on the basis of the census of Okayama-city, Japan, which predict the effect of control strategies against bioterrorism and the loss scale. On simulating a smallpox epidemic, we followed the method of the Individual Based Model stochastically, which can treat the population in the virtual area as individuals. Individuals have personal information, behavior patterns, and interactions among social groups. We took into consideration the influence of residual immunity due to past vaccination. We considered Traced Vaccination (TV) and Mass Vaccination (MV) strategies against bioterrorism. We investigated the effect of TV and MV strategies on the suppression of smallpox epidemics. Consequently, the TV strategy was found to have higher effectiveness than the MV strategy. |
| キーワード | smallpox bioterrorism Individual Based Model Traced Vaccination Mass Vaccination |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 33 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304844 |
| JaLCDOI | 10.18926/fest/12814 |
|---|---|
| フルテキストURL | 13_001_005.pdf |
| 著者 | Chegbeleh Larry Pax| 西垣 誠| Akudago John Apambilla| Alim Md. Abdul| 小松 満| |
| 抄録 | In an effort to secure the comfort of all aspect of life and security through electricity production, research, nuclear weapons production and medical uses, radioactive waste is being generated throughout the world as a result. Without pro – active management and protection, the hazardous nature of radioactive materials can pose serious threats to human health and the environment. A waste containment or disposal facility is required to isolate the waste from man and the biosphere to avoid any undue radiation exposure. Deep geological repository or disposal facility is considered as an effective way to isolate high level radioactive waste, HLW from the human environment, for which a multi – barrier system plays a very significant role. In this paper, literature collection was carried out, aimed to overview the present knowledge about the concepts of repository for HLW and to identify technologies that are currently available in the nuclear industry worldwide and the current state of barrier technologies for hazardous waste sites. |
| キーワード | repository bentonite radioactive waste swelling buffer and backfill materials |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 2008-03 |
| 巻 | 13巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 5 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304817 |
| JaLCDOI | 10.18926/bgeou/12813 |
|---|---|
| タイトル（別表記） | A Synchronic and Diachronic Analysis of the Word 'Creature' : With Special Reference to Richardson's Epistolary Novels |
| フルテキストURL | 137_115_124.pdf |
| 著者 | 脇本 恭子| |
| 抄録 | The present paper aims at examinig the word 'creature' from both synchronic and diachronic perspectives. The first section begins with providing several definitions of 'creature,' along with its etymology, in reference to such major dictionaries as the Oxford English Dictionary and Johnson's A Dictionary of the English Language(1755). In the subsequent three sections, the frequency and the collocation of this word are investigated through Richardson's Pamela and Clarissa as our main linguistic materials. A comparative discussion is made with several literary works from the late 16th to the early 19th centuries. Our final purpose here is to explore one of the stylistic features peculiar to 'sentimentalism' - a literary trend in eighteenth century English where Richardson played a significant role as its founder. |
| キーワード | 'creature' Richarson Clarissa 感情表現 sentimentalism |
| 出版物タイトル | 岡山大学教育学部研究集録 |
| 発行日 | 2008-02-25 |
| 巻 | 137巻 |
| 開始ページ | 115 |
| 終了ページ | 124 |
| ISSN | 0471-4008 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002304881 |
| JaLCDOI | 10.18926/bgeou/12809 |
|---|---|
| フルテキストURL | 137_079_090.pdf |
| 著者 | Takatsuka, Shigenobu| |
| 抄録 | The current state of English as a Lingua Franca (ELF) used in communication between nonnative speakers of English seems to require a change in the way English is taught and learned. However, English has still been taught and learned as a foreign language as ifit were mainly used in communication with its NSs. This article attempts to review some ofthe recent advances in ELF research and then to draw their pedagogical implications. |
| キーワード | English as a Lingua Franca (ELF) English as a Foreign Language (EFL) interlanguage theory ELF core accommodation skills |
| 出版物タイトル | 岡山大学教育学部研究集録 |
| 発行日 | 2008-02-25 |
| 巻 | 137巻 |
| 開始ページ | 79 |
| 終了ページ | 90 |
| ISSN | 0471-4008 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304878 |
| JaLCDOI | 10.18926/OER/12695 |
|---|---|
| タイトル（別表記） | Polish System Transformation and Its Implication for the Technical Terms for Social Sciences |
| フルテキストURL | oer_28_1_091_122.pdf |
| 著者 | 田口 雅弘| |
| 抄録 | This note refers to recent problems of the technical terms used in the social sciences in Poland. The current system transformation process in Poland has a great influence upon the political, economic and social life. Many new technical terms are flowing into Poland with the progress of the radical transformation of the system. In part one, the author presents the general situation of the inflow of the words of foreign origin, the occurence of the new words and concepts in connection with the change of economic relations, the social life and the basic ideology of society. Part two is an introduction of new Polish basic dictionaries, other dictionaries of technical terms for social sciences, and the new texts of economics. The author also makes some comments on these dicitionaries and texts. This note is an attempt to make clear the main problems of current Polsh language for the editing work on "The Polish-Japanese-English Dictionary of Political Economic Terms". |
| 出版物タイトル | 岡山大学経済学会雑誌 |
| 発行日 | 1996-06-05 |
| 巻 | 28巻 |
| 号 | 1号 |
| 開始ページ | 91 |
| 終了ページ | 122 |
| ISSN | 0386-3069 |
| 関連URL | http://www.e.okayama-u.ac.jp/~shiryou/gakkaishi.htm |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 110000129818 |
| JaLCDOI | 10.18926/OER/12614 |
|---|---|
| フルテキストURL | oer_31_1_147_156.pdf |
| 著者 | 太田 仁樹| |
| 出版物タイトル | 岡山大学経済学会雑誌 |
| 発行日 | 1999-06-10 |
| 巻 | 31巻 |
| 号 | 1号 |
| 開始ページ | 147 |
| 終了ページ | 156 |
| ISSN | 0386-3069 |
| 関連URL | http://www.e.okayama-u.ac.jp/~shiryou/gakkaishi.htm |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 110000129998 |
| JaLCDOI | 10.18926/OER/12515 |
|---|---|
| フルテキストURL | 34_4_001_006.pdf |
| 著者 | 太田 仁樹| |
| 出版物タイトル | 岡山大学経済学会雑誌 |
| 発行日 | 2003-03-10 |
| 巻 | 34巻 |
| 号 | 4号 |
| 開始ページ | 1 |
| 終了ページ | 6 |
| ISSN | 0386-3069 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002304905 |
| JaLCDOI | 10.18926/OER/12404 |
|---|---|
| フルテキストURL | 38_4_001_019.pdf |
| 著者 | Azizi Mohammad Najeeb| 春名 章二| |
| 抄録 | It is significant to thoroughly scrutinize past practices and feats, to identify important factors towards developmental failure and success and to avoid mistakes for the future of an industrialized and prosperous Afghanistan. As a result of profound research, a number of researchers have added to the literature on the country’s history, culture, wars, strategic importance and position as a buffer state that cover Afghan polity, ideological dimensions, and social and cultural intricacies. However, few scholarly works exist on the political economy in general and on the historical economic performances and policies in detail. Drawing upon immense and varied literature, the purpose of this paper is to analyze and describe historical and social changes, economic structures and strategies of Afghanistan with a detailed account of (i) political vision, (ii) institutional reforms, (iii) economic agendas, and (iv) development progress in the light of economic development theory and practice. We conclude that being provided right policies and firm political determination, Afghanistan has the potential to become a more developed country in the short span of time. |
| キーワード | Economic History Development Economics Afghan Economy |
| 出版物タイトル | 岡山大学経済学会雑誌 |
| 発行日 | 2007-03 |
| 巻 | 38巻 |
| 号 | 4号 |
| 開始ページ | 1 |
| 終了ページ | 19 |
| ISSN | 03863069 |
| 言語 | 英語 |
| 著作権者 | 岡山大学経済学会 |
| 論文のバージョン | publisher |
| NAID | 120002304845 |
| JaLCDOI | 10.18926/OER/12382 |
|---|---|
| フルテキストURL | 39_4_151_176.pdf |
| 著者 | 黒田 耕嗣| 村井 浄信| |
| 抄録 | Using a Gibbs distribution developed in the theory of statistical physics and a long−range percolation theory, we present a new model of a stock price process for explaining the fat tail in the distribution of stock returns. We consider two types of traders, Group A and Group B : Group A traders analyze the past data on the stock market to determine their present trading positions. The way to determine their trading positions is not deterministic but obeys a Gibbs distribution with interactions between the past data and the present trading positions. On the other hand, Group B traders follow the advice reached through the long−range percolation system from the investment adviser. As the resulting stock price process, we derive a Lévy process. |
| キーワード | stock price process Lévy process Gibbs distribution long−range percolation fat tail |
| 出版物タイトル | 岡山大学経済学会雑誌 |
| 発行日 | 2008-03 |
| 巻 | 39巻 |
| 号 | 4号 |
| 開始ページ | 151 |
| 終了ページ | 176 |
| ISSN | 03863069 |
| 言語 | 英語 |
| 著作権者 | 岡山大学経済学会 |
| 論文のバージョン | publisher |
| NAID | 120002304827 |
| 著者 | モハメド アリ ナグワ シャバン| |
|---|---|
| 発行日 | 2007-03-23 |
| 資料タイプ | 学位論文 |
| 著者 | サバルディン アハマド| |
|---|---|
| 発行日 | 2007-03-23 |
| 出版物タイトル | |
| 資料タイプ | 学位論文 |
| JaLCDOI | 10.18926/11869 |
|---|---|
| フルテキストURL | 004_037_045.pdf |
| 著者 | 岡本 基| 森 秀治| Nita Nahoko| Noyori Maki| Hirano Humiko| |
| 抄録 | 神経生物学的研究における基本的分析系の確立を目的として、シクロデキストリン（CD）を用いたラット大脳皮質神経細胞の初代培養を試みた。β-およびγ-CDは、無血清培地（ダルベッコ改変MEM/ハム培地）中で胎生16および18日目ラットの神経細胞を11日以上10％胎児ウシ血清を加えた培地中と同じ程度に生存させたが、α-CDには生存維持効果が無かった。β-CDはγ-CDより安定した生存維持効果を示したが、胎生21日目ラットの神経細胞を用いた場合は有意に生存率が低下し、新生児ラットでは生存維持効果が無かった。β-CDを用いた無血清培養では10％血清培地中と比べて神経突起の伸展が悪かったが、ときに顕著な突起伸展がみられ、これはCD分子に取り込まれた生理活性物質の作用と考えられた。また、β-CDを用いた無血清培養を利用してラット脳から精製したコンドロイチン硫酸プロテオグリカン（CSPG）の作用を検討し、CSPGがグルタミン酸による神経細胞死を防止すること、弱いながら培養神経細胞の生存を維持する作用をもつことを示した。以上の結果から、この無血清培養法は神経生物学的研究において有用な分析系となりうることを指摘した。 |
| キーワード | β-cyclodextrins γ-cyclodextrins serum-free culture cortical neuron chondroitin sulfate proteoglycan |
| 出版物タイトル | 岡山大学医療技術短期大学部紀要 |
| 発行日 | 1994-01-31 |
| 巻 | 4巻 |
| 開始ページ | 37 |
| 終了ページ | 45 |
| ISSN | 0917-4494 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313740 |