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Nanoscale surface properties of iron treated by electrochemical and physico-chemical methods
H. Nanjo,M. Fujimura,N.J. Laycock,Z. Xia,M. Nishioka,I. Ishikawa,J. Onagawa 한국물리학회 2006 Current Applied Physics Vol.6 No.3
The nanoscale surface structure of surface oxide lms formed on pure iron treated by UV irradiation at 3 mW/cm2 and electrochem-microscopy and spectroscopic ellipsometry. UV irradiation of the air-formed lm decreased the lm thickness, surface roughness andsurface area. UV irradiation of electrochemically passivated surfaces increased the lm thickness and the terrace width of the oxide film.
Atomic-scale flattening of Ni-Cr alloy surfaces by electrochemical passivation treatments
H. Nanjo,N. J. Laycock,H. Deng,I. Ishikawa,N. Sanada 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Ni–Cr alloys were electrochemically passivated in sulphuric acid solutions, generating atomically flat oxide surfaces on the terraces of the resulting passive films. High resolution ex-situ scanning tunnelling microscopy revealed a nanocrystalline structure for the passive film, with a tendency for the grain size to decrease with increasing Cr content in the alloy.
DEVELOPMENT OF THE EPIDIDYMIS IN MEISHAN BOARS
Harayama, H.,Nanjo, I.,Kanda, S.,Kato, S. Asian Australasian Association of Animal Productio 1992 Animal Bioscience Vol.5 No.1
The developmental process of the epididymis was investigated in Meishan boars from 1 to 364 days of age. Epididymal weight increased rapidly between 45 and 150-180 days of age. The diameter and epithelial area of the epididymal ducts greatly increased up to 105-120 days of age. At 1 day of age, the central and distal cauda already had a pseudostratified epithelium surrounded by smooth muscle. At 60-75 days of age, the central and distal caput, corpus, and proximal cauda revealed a well-developed structure of the epithelium. The proximal caput showed a tall, irregular and vacuolar epithelium at 105-120 days of age. PAS-positive contents in the lumen of the caput, corpus and cauda epididymides were first detected at 60-75, 45-60 and 1-30 days of age, respectively. Moreover, in the central and distal caput, PAS-positive granules appeared at 60-75 days of age, and increased until 105-120 days. These results suggest that the epididymis develops completely by approximately 120 days of age, though its weight increases rapidly up to 150-180 days. Thus, it appears that development of the epididymis occurs at an earlier age in Meishan boars than in European and American breeds.
Dynamic simulation of wire rope with contact
Etsujiro Imanishi,Takao Nanjo,Takahiro Kobayashi 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
We present a dynamic simulation of a wire rope involving both contacts with a winch drum and hydraulic systems using the finite element method. Rapid winch operation often causes disorderly winding of the wire rope, which is an important quality problem. Dynamic simulation is, therefore, required for design of the hydraulic winch system on construction machinery. The wire rope is modeled using by truss elements considering large displacement motion. The contact between the wire rope and the winch drum is modeled using by variable-length truss elements and bilinear spring elements. An improved Newton method is proposed for nonlinear dynamic analysis. Simulation results show that some lever operations result in rope looseness and intense pressure fluctuation.
Management of Remnant or Recurrent Lesions after Endoscopic Papillectomy
Ichiro Yasuda,Saito Kobayashi,Kosuke Takahashi,Sohachi Nanjo,Hiroshi Mihara,Shinya Kajiura,Takayuki Ando,Kazuto Tajiri,Haruka Fujinami 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Endoscopic papillectomy (EP) for ampullary adenomas achieves cure rates ranging from 76% to 90%, and recurrence rates are as high as 33%. If remnant or recurrent lesions after prior EP are endoscopically visible and are not suspected of intraductal extension into the biliary or pancreatic duct, repeated snaring and cutting can be performed until all visible lesions are completely resected. However, endoscopic ablative therapies, particularly argon plasma coagulation, can be attempted for tiny or uncertain remnant and recurrent lesions. In addition, intraductal radiofrequency ablation has recently been attempted for residual intraductal lesions after EP at several institutions. Although still under investigation, it has shown some promise. It might be offered as an alternative to surgery, particularly in patients who are unfit for surgery or those who refuse to undergo surgery
Shinji Tanishima,Tokumitsu Mihara,Atsushi Tanida,Chikako Takeda,Masaaki Murata,Toshiaki Takahashi,Koji Yamane,Tsugutake Morishita,Yasuo Morio,Hiroyuki Ishii,Satoru Fukata,Yoshiro Nanjo,Yuki Hamamoto,T 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.3
Study Design: Multicenter, prospective study. Purpose: To investigate the effects of diabetes mellitus (DM) on surgical outcomes in patients with cervical myelopathy. Overview of Literature: To date, few studies have investigated the influence of postoperative blood glucose or glycated hemoglobin (HbA1c) levels on surgical outcomes. Methods: The participants were patients who underwent surgery for the treatment of cervical spondylotic myelopathy and ossification of the posterior longitudinal ligament. The 61 cases were evaluated preoperatively and 1 year postoperatively using the Japanese Orthopaedic Association (JOA) scores and the JOA Cervical Myelopathy Evaluation Questionnaire (JOACMEQ). The study variables included fasting blood glucose and HbA1c levels measured preoperatively and at 1 week, 4 weeks, and 1 year postoperatively; the F-wave conduction velocity, latency, rate of occurrence, and M-wave latency in the ulnar and tibial nerves were measured preoperatively and at 1 year postoperatively. The patients were divided into a group without diabetes (N group, 42 patients) and a group with diabetes (DM group, 19 patients). We then assessed the associations between the surgical outcomes and each of the study variables. Results: JOA scores significantly improved in both groups; however, no significant between-group differences were found. There was no significant improvement in the JOACMEQ scores, which assessed cervical function, upper and lower limb function, and bladder function in both groups. We then subdivided the DM group into those with a good control of HbA1c after 1 year (DMG group, 12 patients) and those with HbA1c deterioration after 1 year (DMB group, seven patients), prior to comparing the surgical outcomes. The JOACMEQ scores for upper and lower limb function significantly improved in the DMG group (p<0.01). Compared with the DMB group, there were no significant increases in upper or lower limb function scores in the DMG group. Conclusions: Poor glycemic control might prevent postoperative functional recovery of the spinal cord.