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PLASTIC DEFIRMATION AND FRACTURE OF SMALL CRYSTALS
Masao, Masao, Doyama 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
Body centered cubic whiskers having [100] and [110] axes were pulled by use of molecular dynamics using a super computer. The upper yield stress close to the theoretical strength was found. After the upper yield stress, phase transformation was observed at the same time the stress was greatly reduced. A new possible mechanism of twinning is proposed. The whiskers were pulled until they had broken into two pieces. Copper small crystals with and without a crack were sheared. It was observed that the edge dislocations were created at the surface and moved through and escaped from the crystals. Copper small single crystals with crack were pulled. A half dislocation was created near the tip of the crack Sharp yield stress was observed. In medium deformation disclocations on dofferent slip planes were created. Due to the cutting of dislocations the tensile stress increased.
Masao Koda,Chikato Mannoji,Masazumi Murakami,Tomoaki Kinoshita,Jiro Hirayama,Tomohiro Miyashita,Yawara Eguchi,Masashi Yamazaki,Takane Suzuki,Masaaki Aramomi,Mitsutoshi Ota,Satoshi Maki,Kazuhisa Takaha 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.6
Study Design: Retrospective case-control study. Purpose: To determine whether kissing spine is a risk factor for recurrence of sciatica after lumbar posterior decompression using a spinous process floating approach. Overview of Literature: Kissing spine is defined by apposition and sclerotic change of the facing spinous processes as shown in X-ray images, and is often accompanied by marked disc degeneration and decrement of disc height. If kissing spine significantly contributes to weight bearing and the stability of the lumbar spine, trauma to the spinous process might induce a breakdown of lumbar spine stability after posterior decompression surgery in cases of kissing spine. Methods: The present study included 161 patients who had undergone posterior decompression surgery for lumbar canal stenosis using a spinous process floating approaches. We defined recurrence of sciatica as that resolved after initial surgery and then recurred. Kissing spine was defined as sclerotic change and the apposition of the spinous process in a plain radiogram. Preoperative foraminal stenosis was determined by the decrease of perineural fat intensity detected by parasagittal T1-weighted magnetic resonance imaging. Preoperative percentage slip, segmental range of motion, and segmental scoliosis were analyzed in preoperative radiographs. Univariate analysis followed by stepwise logistic regression analysis determined factors independently associated with recurrence of sciatica. Results: Stepwise logistic regression revealed kissing spine (p =0.024; odds ratio, 3.80) and foraminal stenosis (p <0.01; odds ratio, 17.89) as independent risk factors for the recurrence of sciatica after posterior lumbar spinal decompression with spinous process floating procedures for lumbar spinal canal stenosis. Conclusions: When a patient shows kissing spine and concomitant subclinical foraminal stenosis at the affected level, we should sufficiently discuss the selection of an appropriate surgical procedure.
Stent-graft placement for treatment of massive hemobilia caused by porto-biliary fistula
Masao Takahashi,Yozo Sato,Kazuo Hara,Nozomi Okuno,Ikuo Dejima,Shinichi Murata,Takaaki Hasegawa,Shohei Chatani,Hiroaki Onaya,Yoshitaka Inaba 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.4
Proton beam therapy is a type of radiation therapy and a promising modality for cancer management because it involves few adverse effects and high therapeutic efficacy. However, there are reports of acute and late complications because of normal tissue damage. Hemobilia, known as bleeding from the biliary tree, is observed in various conditions, and it can also be of iatrogenic origin such as due to percutaneous hepatobiliary interventions. In most cases, it can be managed conservatively without significant hemorrhage. However, in a few cases with massive hemobilia, further intervention is necessary. We report the successful use of a stent-graft in the portal vein to treat massive hemobilia with porto-biliary fistula that was caused by previous proton beam therapy.