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| 1 | Image analysis of soil failure on defective underground pipe due to cyclic water supply and drainage using X-ray CT显示文摘The ground subsidence on the underground pipe often is caused with the reduction of the effective stress and the loss of suction in the base course and then,soil drainage into the pipe.The final formation of the cavity growth in the ground was observed as the ground subsidence.Authors focused this problem and hence performed model tests with water-inflow and drainage cycle in the model ground.The mechanism of cavity generation in the model ground was observed using an X-ray Computed Tomography(CT)scanner.In those studies,water was supplied into the model grounds from the defected underground pipe model in case of the change of relative density and grain size distribution.As results,it was observed that the loosening area was generated from the defected part with water-inflow and some of the soil particles in the ground were drained into the underground pipe through the defected part.And afterward,the cavity was generated just above the defected part of the model pipe in the ground.Based on this observation,it might be said that the bulk density of soil around the defected pipe played one of key factor to generate the cavity in the ground.Moreover,the dimension of the defected part should be related to the magnification of the ground subsidence,in particular,crack width on a sewerage pipe and particle size would be the quantitative factor to evaluate the magnification of the ground subsidence.In this paper,it was concluded that the low relative density of soil would become the critical factor to cause the fatal failure of model ground if the maximum grain size was close to the dimension of crack width of defective part.The fatal collapse of the ground with high relative density more than 80%would be avoided in a few cycles of water inflow and soil drainage. | Toshifumi MUKUNOKI Naoko KUMANO Jun OTANI | 2012 | Frontiers of Structural and Civil Engineering2012，6，2： | 5 |
| 2 | The pull-out resistance of geogrids in reinforced soil显示文摘 | HIDETOSHI Ochiai JUN Otani SHIGENORI Hayashic | 1996 | Geotextiles and Geomembranes1996，14，1： | 1 |
| 3 | Circulating tumor cells as a prognostic factor in patients with smallcell lung cancer显示文摘 | Satoshi Igawa Keigo Gohda Tomoya Fukui Shinichiro Ryuge Sakiko Otani Akinori Masago Jun Sato Katsuhiro Murakami Sachiyo Maki Ken Katono Akira Takakura Jiichiro Sasaki Yukitoshi Satoh Noriyuki Masuda | 2014 | Oncology Letters2014，，5： | 1 |
| 4 | The pull-out resistance of geogrids in reinforced soil显示文摘 | Hidetoshi Ochiai Jun Otani Shigenori Hayashic | | 0，，01： | 1 |
| 5 | Long-Term Right Ventricular Volume Overload Increases Myocardial Fluorodeoxyglucose Uptake in the Interventricular Septum in Patients With Atrial Septal Defect显示文摘 | Hiroki Otani Yutaka Kagaya Yuriko Yamane Masanobu Chida Kenta Ito Shigeto Namiuchi Nobuyuki Shiba Yoshito Koseki Mototsugu Ninomiya Jun Ikeda Haruo Saito Shin Maruoka Takehiko Fujiwara Tatsuo Ido Nobumasa Ishide Kunio Shirato | 2000 | Circulation: Journal of the American Heart Association2000，，14： | 1 |
| 6 | Visualization for engineering property of in-situ light weight soils with air foams显示文摘 | Otani Jun Toshifumi Mukunoki and Yoshiaki Kikuchi | 2002 | Soils and Foundations2002，42，3： | 1 |
| 7 | The pull-out resistance of geogrids in reinforced soil显示文摘 | Hidetoshi Ochiai Jun Otani Shigenori Hayashic | | 0，，01： | 1 |
| 8 | The pull-out resistance of geogrids in reinforced soil 显示文摘 | Hidetoshi Ochiai Jun Otani Shigenori Hayashic | 1996 | Geotextiles and Geomembranes1996，14，： | 1 |
| 9 | The pull-out resistance of geogdds in reinforced soil显示文摘 | HIDETOSHI Ochiai JUN Otani Shigenors hayashic takao hirai | 1996 | Geotextiles and Geomembranes1996，14，： | 1 |
| 10 | Odd‐skipped related 1 is a novel tumour suppressor gene and a potential prognostic biomarker in gastric cancer显示文摘 | Koji Otani Yujuan Dong Xiaoxing Li Jing Lu Ning Zhang Lixia Xu Minnie YY Go Enders KW Ng Tetsuo Arakawa Francis KL Chan Joseph JY Sung Jun Yu | 2014 | Pathol2014，，3： | 1 |
| 11 | A study on quality evaluation for bituminous mixture using X-ray CT显示文摘The objective of this paper is to propose a new quality evaluation method for asphalt concrete mixture using X-ray CT scanner.To achieve this aim,asphalt mixtures should be subjected to the X-ray CT scanning and its characteristics should be clarified.The approach employed in this study was as follows:1)Coarse aggregate,fine aggregate,filler and bitumen were prepared;2)dense-graded,coarse-graded and porous asphalt mixtures were made;3)materials and mixtures were subjected to the X-ray CT scanning;4)frequency of CT-value,threshold value,average slice CT-value,average segment CT-value were computed.In the material examination,CT-value of aggregate becomes smaller in the order of coarse aggregate,fine aggregate and filler and CT image of bitumen was nearly homogeneous.In the mixture examination,histograms of CT-value and four segmentation images made from CT images expressed the material and mixture characterization such as particle size and the difference in bitumen content and mixture type visibly and the bitumen content varies with the threshold values.In addition,the average segment CT-value without threshold value by dividing the fine aggregate from the coarse aggregate and average CT-value of the coarse aggregate,especially is highly correlated with average CT-value of the bitumen. | Satoshi TANIGUCHI Keiichiro OGAWA Jun OTANI Itaru NISHIZAKI | 2013 | Frontiers of Structural and Civil Engineering2013，7，2： | 0 |
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