result 13610 件
| JaLCDOI | 10.18926/11717 |
|---|---|
| Title Alternative | 因果関係モデルによる腎移植レシピエントのQOLの分析 |
| FullText URL | 010_2_077_084.pdf |
| Author | Hayashi, Yuko| Kanao, Naomi| Nakanishi, Yoshiko| Watanabe, Kumi| Hoshina, Eiko| |
| Abstract | The purpose of this study is to analyze the structural relationship among the components of quality of life of kidney transplant recipients by using a causal model. The subjects were 329 recipients who had regular checks-up following transplantation in seven general hospitals in Tokyo, Gunma, Aichi, Okayama, and Hiroshima, and agreed to participate in this study. Ferrans and Powers's Quality of Life - Index Kidney Transplant version was used to measure perceived quality of life. The self-administered questionnaires were handed over to the subjects, who completed the instrument on the spot. After that, the answers were collected immediately. The factor analysis and the covariance structure analysis were used to make clear the structural relationship among the components of quality of life. The results of data analysis were as follows : (1) Five components of quality of life were extracted ; socio-economic functioning, family ties, emotional support, physical health, and peace & happiness. (2) The scores in the family ties dimension and the physical health dimension were higher than in the others, and the score in the socio-economic functioning dimension was the lowest. (3) The physical health showed the starting point in a causal model. (4) The physical health influenced the family ties and the socio-economic functioning. (5) The socio-economic functioning strongly influenced the peace & happiness and the emotional support. (6) The family ties influenced the socio-economic functioning, the emotional support, and the peace & happiness. Therefore, it was conceivable that it was particularly important to make approaches for the physical health, the family ties, and the socio-economic functioning dimensions to improve quality of life. |
| Keywords | 腎移植のレシピエント (kidney transplant recipient) QOLの構成要素 (components of quality of life) QOLのパスダイアグラム (path diagram of quality of life) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-03-24 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 77 |
| End Page | 84 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002313658 |
| JaLCDOI | 10.18926/11714 |
|---|---|
| Title Alternative | スクリーン／フィルム乳房撮影法における乳房線量測定システム |
| FullText URL | 010_2_099_106.pdf |
| Author | Goto, Sachiko| Azuma, Yoshiharu| Maruyama, Toshinori| Nakagiri, Yoshitada| Takeda, Yoshihiro| Sugita, Katsuhiko| Kadohisa, Shigefumi| |
| Abstract | The average glandular dose to glandular tissue m mammography is generally assumed to be a function of beam quality (HVL), x-ray tube target material, tube voltage, breast thickness, breast composition and, to a lesser extent, x-ray tube voltage waveform. The average glandular dose is generally determined from published tables with knowledge of the above function. Tables for a high frequency x-ray generator are not yet published. In our study, the lookup tables for the average glandular dose were made at 28 kV (high frequency x-ray generator), employing a breast simulating tissue (0-100% adipose tissue, 0-100% glandular tissue) phantom for an Mo target - Mo filter source assembly. We tried to estimate breast composition from x-ray mammograms by digital image processing techniques, also using the simulating tissue phantom. Then the system that automatically calculates the average glandular dose from digitized clinical x-ray mammograms was built. It is considered that this system can contribute to objective evaluation of the average glandular dose. |
| Keywords | Screen/Film Mammography (スクリーン／フィルム乳房撮影法) Breast composition (乳房構成) Average glandular dose (平均乳腺線量) Entrance skin exposure (皮膚入射線量) Breast-equivalent material phantom (乳房組織等価ファントム) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-03-24 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 99 |
| End Page | 106 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002313736 |
| JaLCDOI | 10.18926/11709 |
|---|---|
| Title Alternative | 歯科インプラント動揺測定装置の開発 |
| FullText URL | 011_1_025_034.pdf |
| Author | Oka, Hisao| Ono, Koichi| Wijaya Sastra Kusuma| Saratani, Keiji| Kawazoe, Takayoshi| |
| Abstract | Evaluation of dental implantation is very important because it gives useful information for both planning the dental treatment and evaluating of prognosis. This study aimed at improving our previously developed Tooth Mobility (TM) tester and developing a dental implant movement (IM) checker. The measuring probe included a bimorph transducer of two piezoelectric elements. It was actuated by single frequency and detected tooth acceleration. The acceleration signal was processed and the IM score was calculated in PC. Two artificial implant models in which IMZ implant was buried with different elasticity of surrounding (molteno(@)) were used to examine the performance of the IM checker. The IM scores obtained in the models were 29 and 58. The measurement time was below 15 seconds. The average of measurement variation of one operator was below 6% and the average variation among five operators was below also 6%. The IM checker reduced a measurement variation by 51% and a measuring time by 61% compared with those of the TM tester in natural teeth. The newly developed IM checker had sufficient measuring reliability and we could objectively estimate the implant movement in dental clinics. |
| Keywords | tooth mobility (歯の動揺) mechanical mobility (機械モビリティ) dental implant (インプラント) manual examination (触診) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-11-16 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 25 |
| End Page | 34 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002313864 |
| JaLCDOI | 10.18926/11694 |
|---|---|
| Title Alternative | 低線量放射線による抗酸化系の誘導と活性酸素病治療への応用の可能性 |
| FullText URL | 011_1_001_015.pdf |
| Author | Yamaoka, Kiyonori| |
| Abstract | We clarified that adequate oxygen stress induced by low dose radiation activates not only chemical biological protective function, such as induction of the synthesis of SOD, GPX and HSP70, but also the biomembrane function, such as enhanced membrane fluidity and ATPase activity. It is possible that activation of these mechanisms alleviates in vivo oxidation injuries resulting in alleviation of pathologic condition, such as symptoms of hepatopathy and diabetes mellitus. Namely, adequate activation of the functions of the living body by low dose radiation can contribute to suppressing aging and to preventing or reducing active oxygen species related diseases which are thought to involve peroxidation and have been regarded as the diseases for which radon spring water is an effective treatment. Clarification in detail of the mechanisms of these phenomena is required to understand the effects of low dose radiation on the functions of the living body, including adaptive response. |
| Keywords | antioxidant system (抗酸化系) low dose radiation (低線量放射線) radon inhalation (ラドン) active oxygen species related diseases (活性酸素病) adaptive response (適応応答 ) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-11-16 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 15 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002314000 |
| JaLCDOI | 10.18926/11685 |
|---|---|
| Title Alternative | 日本に於ける二酸化炭素泉療法の現況 |
| FullText URL | 061_068_072.pdf |
| Author | Komoto, Yoshiaki| Soda, Mitsuhiro| Hirai, Shunichi| Morisue, Shinhachi| Suzuka, Ichio| Yorozu, Hidenori| |
| Abstract | Natural CO(2) springs have been scarcely utilized in Japan, whereas artificial CO(2) bathing has become popular by the introduction of CO(2) tablets and other apparatus for CO(2) water supply. Artificial CO(2) bathing is indicated for degenerative connective tissue disorders such as scleroderma, common stiff and painful shoulders, chronic joint pain, lumbago, and trophic changes due to insufficient peripheral circulation by virtue of the increase of tissue pO(2) and the improvement of tissue perfusion. Artificial CO(2) bathing promotes recovery from fatigue and is beneficial in women whose health has been adversely affected by cold. |
| Keywords | CO(2) -balneotherapy Artificial CO(2) -bathing Tissue pO(2) |
| Publication Title | 環境病態研報告 |
| Published Date | 1990-09 |
| Volume | volume61 |
| Start Page | 68 |
| End Page | 72 |
| ISSN | 0913-3771 |
| language | English |
| File Version | publisher |
| NAID | 120002313982 |
| JaLCDOI | 10.18926/11668 |
|---|---|
| Title Alternative | カンジダ特異的IgG(4)抗体と気管支喘息 |
| FullText URL | 062_001_004.pdf |
| Author | Tanizaki, Yoshiro| Kitani, Hikaru| Okazaki, Morihiro| Mifune, Takashi| Mitsunobu, Fumihiro| Takatori, Akimasa| Okuda, Hiroyuki| Harada, Hideo| |
| Abstract | Serum levels of Candida-specific IgG(4) antibodies were examined in 66 patients with bronchial asthma, relating to patient age and asthma severity. 1. The levels of Candida-specific IgG(4) antibodies were the highest in patients with 60+years of age, compared to the levels in cases with 0-39 and 40-59 years of age. 2. In cases with 40-59 years of age, the levels of Candida-specific IgG(4) were significantly higher in cases with long-term steroid therapy (severe intractable asthma) than in cases without steroid regimen. The results suggest that increased levels of Candida-specific IgG(4) were observed in relation to patient age and asthma severity. |
| Keywords | Candida (カンジダ) Sepcific IgG(4) (特異的IgG(4)) Bronchial asthma (気管支喘息) Aging (加齢) Asthma severity (喘息重症度) |
| Publication Title | 環境病態研報告 |
| Published Date | 1991-08 |
| Volume | volume62 |
| Start Page | 1 |
| End Page | 4 |
| ISSN | 0913-3771 |
| language | English |
| File Version | publisher |
| NAID | 120002313495 |
| JaLCDOI | 10.18926/fest/11655 |
|---|---|
| FullText URL | 001_277_288.pdf |
| Author | Tonomura, Naohiko| |
| Abstract | This paper is an attempt to establish an objective criterion for civilizations, in order to treat them impartially and give them a fair assessment. First, theories up to the present about civilizations including those of Spengler and Toynbee are introduced. Second, the criterion presented by Bagby to distinguish major civilizations and peripheral civilizations are examined and proved to be subjective. Then the author proposes as an objective criterion for big civilizations just the pattern of succeeding four stages with the span of 400~500 years each. Big civilizations meeting this requirement which total eight or nine are divided into two types according to the difference of their nature. Lastly is shown how four puzzles of world history that have hitherto caused a lot of disputes (feudalism, absolute power of royalty, capitalism and modernization) can be solved through the recognition of these big civilizations. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 277 |
| End Page | 288 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313986 |
| JaLCDOI | 10.18926/fest/11652 |
|---|---|
| Title Alternative | Features of Australian Spoken English |
| FullText URL | 001_247_261.pdf |
| Author | Kashiwase, Shogo| |
| Abstract | English is spoken in many countries, but the Australian brand is unmistakable. 'G' day, mate' will be curious to non-Australian people, but it will be delightful to the ears of Aussie. In this paper, a piece of (1) 'Australian Daily Spoken English' is displayed as a sample of Australian daily spoken language. A brief list of (2) 'Food Terms' is displayed to show the general features of Australian spoken English. The brief lists of (3) 'Shorten Forms', (4) 'Rhyming Slangs' and (5) 'Common Aussie Expressions' are displayed to show the features of Aussie English. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 247 |
| End Page | 261 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313399 |
| JaLCDOI | 10.18926/11648 |
|---|---|
| Title Alternative | 種々の長さのスペーサーをもつハプテン化ボスファチジルエタノールアミンの新しい合成法 |
| FullText URL | 062_032_037.pdf |
| Author | Ishimori, Yoshio| Yasuda, Tatuji| |
| Abstract | The antigenicity of liposomes sensitized with haptenated phosphatidylethanolamine (PE) and the reactivity of the liposomes with complement depended on the length of the spacer between hapten and PE. To establish the optimal conditions for the assay, haptenated PE's with various length of spacers are required. In the previous method, hapten-spacer molecule was first synthesized to which PE was conjugated. Therefore, even different hapten molecules and different length of spacer molecules were used, every combination of hapten and spacer has to be synthesized. A new procedure for preparing hapten-spacer-PE was described here. We first prepared conjugates between PE and various length of spacer molecule, the terminal of which is an amino residue. These molecules react well with activated hapten molecules, giving a good yield of hapten-spacer-PE. |
| Keywords | Haptenated phosphatidylethanolamine (ハプテン化ホスファチジルエタノールアミン) Spacer (スペーサー) Liposomes (リポソーム) |
| Publication Title | 環境病態研報告 |
| Published Date | 1991-08 |
| Volume | volume62 |
| Start Page | 32 |
| End Page | 37 |
| ISSN | 0913-3771 |
| language | English |
| File Version | publisher |
| NAID | 120002313629 |
| JaLCDOI | 10.18926/fest/11647 |
|---|---|
| FullText URL | 001_211_219.pdf |
| Author | Kitamura, Yoshiro| Ohta, Tomoyuki| |
| Abstract | The drop formation in immiscible liquid-liquid systems under mass transfer conditions was experimentally investigated. To know the exact effact effect of mass transfer on drop sizes, the decrease of interfacial tensions due to the presence of solutes has to be evaluate. Interfacial tensions of liquid pairs were measured with a Wilhelmy method as a function of the relative amounts at which both the solution and the solvent were mutually saturated. The interfacial tensions between the liquid pairs mutually saturated at on equal amount were found to be appropriate for the prediction of the drop formation accompanying mass transfer. |
| Keywords | Interfacial tension Drop size Extraction Mass transfer |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 211 |
| End Page | 219 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313573 |
| JaLCDOI | 10.18926/fest/11646 |
|---|---|
| FullText URL | 001_205_210.pdf |
| Author | Tsuboi, Sadao| Ono, Shin-ichiro| Utaka, Masanori| |
| Abstract | Chiral reduction of 2-oxosuccinic acid esters with fermenting bakers' yeast gave (S)-(-)- malic acid esters in 34-54% isolated yield with 85-100% ee. |
| Keywords | optically active malic acid balers' yeast asymmetric reduction α-ketoester. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 205 |
| End Page | 210 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313572 |
| JaLCDOI | 10.18926/fest/11639 |
|---|---|
| FullText URL | 001_193_198.pdf |
| Author | Shimada, Kiyoshi| Nishimura, Sin-ichi| Fujii, Hiroaki| |
| Abstract | This paper presents a new method for prediction of consolidation settlements of soft grounds. The method is based on the theoretical result which shows that the settlement velocity of soft grounds non-improved or improved with sand drains decreases exponentially with time. Final settlements can be easily derived from the regression analysis for the relationship between the elapsed time and the observed settlement velocity. The method has advantages of its simplicity and capability to give the satisfactorily good estimate of the consolidation settlements, and also the support of the theoretical background. |
| Keywords | consolidation settlement prediction soft ground sand drains one-dimensional consolidation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 193 |
| End Page | 198 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002314033 |
| JaLCDOI | 10.18926/fest/11636 |
|---|---|
| FullText URL | 001_181_192.pdf |
| Author | Fujii, Hiroaki| Narita, Mutsuya| Cheng Chin Thai| Shimada, Kiyoshi| Nishimura, Shinichi| Ofori Emanual| |
| Abstract | This paper describes the prediction of seepage in the impervious zones of six embankment dams by seepage analysis. In addition, by making use of the available monitored pore water pressure data of the first filling of reservoir, back analysis was carried out to estimate the best fit seepage parameters. The estimated parameters were used for further prediction of pore water pressures in subsequent monitored durations with reasonable accuracy. The accuracy of prediction was evaluated quantitatively by the prediction difference and error index. The results show that the error indices in the upstream sides of the impervious zones are smaller than those in the downstream sides. |
| Keywords | Unsaturated soils fill dams pore water pressure back analysis FEM |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 181 |
| End Page | 192 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313591 |
| JaLCDOI | 10.18926/fest/11635 |
|---|---|
| FullText URL | 001_169_179.pdf |
| Author | Abenney-Mickson Stephen| Miura, Takeshi| |
| Abstract | The SWAP93 model was used to predict how much capillary rise would occur in cropped fields. The experimental fields were located in a humid climate and it was thought that contribution from groundwater sources to total water use could be significant. In one field planted with soybean, the model predicted an average daily uptake of 1.3 mm; in another field planted with pumpkin, there was average daily uptake of 0.3 mm; and yet in a third field located in a vinyl house there was average daily uptake of 0.03 mm. These predictions represent about 38,7 and 1% contribution to total water use respectively. Even though there were no measured data to compare with, the results lie within the range of other works reported in the literature. |
| Keywords | Crop water use capillary rise SWAP93 model groundwater |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 169 |
| End Page | 179 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313364 |
| JaLCDOI | 10.18926/fest/11628 |
|---|---|
| Title Alternative | Secular changes of air temperature and precipitation in Okayama City. |
| FullText URL | 001_163_168.pdf |
| Author | Miura, Takeshi| |
| Abstract | In this paper, secular changes of air temperature and the amount of precipitation in Okayama city are discussed using observed values at Okayama meteorologiccal station. Special reference is made to 1993 and 1994 in which peculiar changes occurred. The results obtained are summarized as follows: (1) The increasing rate of the annual mean air temperature at Okayama city is 0.85℃/100y. This value is nearly equal to the average of Japan; 0.87℃/100y. (2) The increasing rate indicates seasonal changes, and the rate is high especially in April and May. (3) The rapid increase of the air temperature in the 1980s is due to removal of Okayama meteorological station from the edge of town to the center. (4) The annual mean air temperature in 1994 is 16.9℃, and the monthly mean temperature for July and August are 29.8 and 29.6℃ respectively. These values are new records at the Okayama station. (5) The air temperature in July and August, 1993 are higher than in 1980 when it was much colder in the summer. (6) The amount of precipitation does not show any secular changes. |
| Keywords | the air temperature secular changes Okayama city |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 163 |
| End Page | 168 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313505 |
| JaLCDOI | 10.18926/fest/11626 |
|---|---|
| FullText URL | 001_151_162.pdf |
| Author | Ndegwa George Maina| Yomota, Atsushi| |
| Abstract | Actual irrigation situation in a typical upland irrigation district was estimated by the water balance method during the 1993 rainy and the 1994 dry year periods. Soil moisture conditions were analysed for cases where daily district water use was supplied to all the cropped upland farms, and to reduced irrigation area percentages. Consumptive use was obtained through monthly weighted crop coefficients used to reduce penman's potential evapotranspiration. The moisture budget was examined at three levels of total readily available moisture, TRAM, i.e., 20,30 and 40 mm; the effect of upward capillary rise was also considered. The results of this study indicated that the actual moisture conditions in upland irrigated farms is influenced by irrigation area, cropping pattern, stage of crop growth and upward capillary rise in the farms. Actual irrigated area was within the range of about 44 to 100% of cropped area while upward capillary rise was between 0.1 and 1 mm day-1, TRAM level of 30 to 40 mm was considered most appropriate for the district. Monthly effective rainfall percentages from the water balance method were fairly close to that determined by the basic irrigation requirement method for some months. Basic irrigation requirement may therefore be considered to incorporate capillary water contribution. |
| Keywords | Upland irrigation TRAM Water balance Capillary water Effective rainfall |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 151 |
| End Page | 162 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313861 |
| JaLCDOI | 10.18926/fest/11624 |
|---|---|
| FullText URL | 002_169_174.pdf |
| Author | Ogino, Masaru| |
| Abstract | In the 1980s there appeared two books about the Victorian attitude towards the ancient Greeks, or about how the Victorians felt about incorporated the ancient Greek culture. The two books are Richard Jenkyn, The Victorians and Ancient Greece (Massachusetts: Harvard University Press, 1980) and Frank M. Turner, The Greek Heritage in Victorian Britain (New Haven: Yale University Press, 1984). Although they deal with the same subject, their approaches toward the subject are quite different from each other. In this paper, I will pick up two themes from each book-- "Greek Gods and Mythology" and "Plato and his Philosophy" --and see the difference in their approaches. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 169 |
| End Page | 174 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002314024 |
| JaLCDOI | 10.18926/fest/11622 |
|---|---|
| FullText URL | 001_121_133.pdf |
| Author | Maeno, Shiro| Yamamoto, Tetsuo| Nago, Hiroshi| |
| Abstract | In this paper the theoretical procedure to analyze the dynamic behavior of highly saturated sand bed around a cylindrical block under the cyclic loading of water pressure is developed. The fundamental equations were derived for the axially symmetric coordinates. Then, the finite element equations were developed to solve these fundamental equations numerically. Finally, the numerical method was verified by experiments. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 133 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313416 |
| JaLCDOI | 10.18926/fest/11619 |
|---|---|
| FullText URL | 001_115_119.pdf |
| Author | Takeshita, Yuji| Kono, Iichiro| |
| Abstract | The unsaturated soil hydraulic properties are essential data to predict the seepage behavior in the vadose zone. In this paper, a new experimental methodology of determining unsaturated soil hydraulic properties is proposed. The soil hydraulic properties are assumed to be represented by van Genuchten's closed-form expressions. Unknown parameters of this model are identified by using a optimization techniques. The optimization approach is nonlinear least-squares algorithm in corporating finite element analysis of one-dimensional nonsteady seepage flow. The advantages of the methods are in the possibility of identifying the optimal unsaturated soil hydraulic properties and diminishing experimental time. To evaluate availability of our proposed method, experimental results which are determined by proposed methods and conventional method are compared for decomposed granite soil. |
| Keywords | unsaturated hydraulic properties back analysis laboratory test groundwater |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 115 |
| End Page | 119 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313807 |
| JaLCDOI | 10.18926/fest/11615 |
|---|---|
| FullText URL | 001_077_089.pdf |
| Author | Okubo, Kenji| Morikawa, Hiroshi| Kimoto, Takashi| Tanaka, Yuji| |
| Abstract | Thermal 'staircase', a layer of constant temperature between the sheets of the steep gradients, was formed in the seasonal thermocline, which was 2.5 m above the bottom at a point of 18 m deep on the boundary slope in Lake Biwa. Following a sediment resuspension event when a moderate onshore wind blew, bed materials should be suspended up to the thermocline, then settled down forming a staircase above the turbid intrusion. Comparing the observed downward hear flux with the settling flux of sediment, it was found that double-diffusive convection would play an important role on the formation of the whole structure consisting of the staircase and turbid intrusion along with chemical anomalies and dense population of phytoplankters, which were fed by nutrients supplied from the bottom sediment under a typical condition of drought. Laboratory experiments were conducted to demonstrate the thermal and sediment processes in the stratified lake. Resuspension process due to surface and internal waves was examined using a tank with a sloping bottom, while the settling process was investigated by using a deep, diffusive tank. Formative process and scales of the staircase and intrusion were discussed relating with the intensity of resuspension and the buoyancy fluxes. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 77 |
| End Page | 89 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313571 |
