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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.
Masao Fujiwara,Yuki Matsushita,Yoshikane Maeba,Ayano Suzuki,Hidekazu Fukamizu,Yoshiki Tokura 대한수부외과학회 2019 대한수부외과학회지 Vol.24 No.4
Purpose: First web space widening is crucial in the hand function. The skin on the dorsal side of the forearm can provide a thin and pliable skin suitable for first web space reconstruction. Although previous reports have described the use of the posterior interosseous artery (PIA) flap as a reverse-flow flap for treatment of first web space contracture, only a few have addressed its use as a free flap for this purpose. The caliber of the concomitant veins accompanying the PIA is usually small, which may give rise to a problem in the treatment.Methods: Seven patients with first web space contracture were treated with a free PIA flap and the details of the venous anastomosis method were elucidated.Results: Six of seven flaps survived. In a post-burn case, a flap was lost by late thrombosis. The PIA is anastomosed end-to-end to the dorsal branch of the radial artery. There are two choices for the recipient venous pedicle: concomitant veins of radial artery and a tributary of the cephalic vein. In our cases, there were four types of venous anastomosis. An average postoperative increase of the thumb radial abduction was 36° and that of the palmar abduction was 35°.Conclusion: Since the caliber of the concomitant veins accompanying the PIA is small, a careful scheme for venous anas-tomosis is essential in the treatment of first web space contracture using the free PIA flap.
Efficiency Increase and Input Power Decrease of Converted Prototype Pump Performance
Masao Oshima 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.3
The performance of a prototype pump converted from that of its model pump shows an increase in efficiency brought about by a decrease in friction loss. As the friction force working on impeller blades causes partial peripheral motion on the outlet flow from the impeller, the increase in the prototype’s efficiency causes also a decrease in its input power. This paper discusses results of analyses on the behavior of the theoretical head or input power of a prototype pump. The equation of friction-drag coefficient for a flat plate was applied for the analysis of hydraulic loss in impeller blade passages. It was revealed that the friction-drag of a flat plate could be, to a certain degree, substituted for the friction drag of impeller blades, i.e. as a means for analyzing the relationship between a prototype pump’s efficiency increase and input power decrease.