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Fabrication of Bi4Ti3O12 Films on Pt Substrate by Inkjet Printing
Masaki Yamaguchi,A Yamamoto,Y Masuda 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Ferroelectric Bi4Ti3O12 thin films were prepared on Pt-coated Si wafers by using alcoholic solutions which dissolved Bi(OtC5H11)3 and Ti[OCH(CH3)2]4 in C2H5OC2H4OH. To fabricate films with a single phase of the perovskite structure, we fired the precursor films in an atmosphere with strong oxidizability. The fabricated films exhibited a single perovskite phase and a predominantly c-axis orientation with plate-like grains larger than 4 × 4 μm2 and smooth surface over an extensive area. The leakage current density of the films was of the order of 10.7 A/cm2. Several 1 × 1 cm2 square patterns were directly drawn on a 4-inch Si wafers by inkjet printing (IJP). The minimum dot size realized was approximately 70 μm in diameter. Beside, the force a droplet from printer head was faithfully. However, from the typical thickness profile of the printed line shape patterns, the height at the center of the line was very low while that at the periphery was extremely high. This seems to be due to the surface tension.
Fabrication of BIT Thick Films Patterned by Proton Beam Writing
Masaki Yamaguchi,Kazuki Watanabe,Hiroyuki Nishikawa,Yoichiro Masuda 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.2
In this study, we fabricated thick films with polyvinylpyrrolidone (PVP) added to bismuth titanate (Bi4Ti3O12) to form a lead-free ferroelectric material. We examined the direct patterning of these materials by using proton-beam irradiation. When 50% PVP was added to the organic source solution, the c-axis orientation was promoted and cracks were suppressed due to stress relaxation. In addition, a dot and an arbitrary-shape micro-pattern were formed on bismuth-titanate thick film by micromachining using a proton beam.
Masaki Yamaguchi,Hiroki Yamamuro,Masayuki Takashiri 한국물리학회 2018 Current Applied Physics Vol.18 No.12
Bismuth telluride (Bi2Te3) thin films were prepared with various electrolyte temperatures (10°C–70 °C) and concentrations [Bi(NO3)3 and TeO2: 1.25–5.0 mM] in this study. The surface morphologies differed significantly between the experiments in which these two electrodeposition conditions were separately adjusted even though the applied current density was in the same range in both cases. At higher electrolyte temperatures, a dendrite crystal structure appeared on the film surface. However, the surface morphology did not change significantly as the electrolyte concentration increased. The dendrite crystal structure formation in the former case may have been caused by the diffusion lengths of the ions increasing with increasing electrolyte temperature. In such a state, the reactive points primarily occur at the tops of spiked areas, leading to dendrite crystal structure formation. In addition, the in-plane thermoelectric properties of Bi2Te3 thin films were measured at approximately 300 K. The power factor decreased drastically as the electrolyte temperature increased because of the decrease in electrical conductivity due to the dendrite crystal structure. However, the power factor did not strongly depend on the electrolyte concentration. The highest power factor [1.08 μW/(cm·K2)] was obtained at 3.75 mM. Therefore, to produce electrodeposited Bi2Te3 films with improved thermoelectric performances and relatively high deposition rates, the electrolyte temperature should be relatively low (30 °C) and the electrolyte concentration should be set at 3.75 mM.
Shuhei Yamaguchi,Nobuhiro Yamaguchi,Masaki Mito,Hiroyuki Deguchi,Peter. J. Baker,Stephen. J. Blundell,Michael. J. Pitcher,Dinah. R. Parker,Simon. J. Clarke 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The pressure effects on the 111-type Fe-based superconductor LiFeAs were investigated throughAC susceptibility measurements and X-ray diffraction experiments, and revealed a correlation betweenthe superconducting transition temperature (Tc) and the As-Fe-As bond angle (α) ratherthan the height of As from the Fe layers (hAs). As the pressure was increased, Tc of 17 K at P =0 GPa decreased down to 10 K at P = 5.2 GPa. According to a previous report from an X-raydiffraction experiment, α changes from 101.5˚ at 0 GPa to 97.8˚ at 17 GPa. The obtained changein Tc is consistent with Lee et al.’s plot of Tc as a function of α, and from this result, we concludethat Tc will fall to zero at around α = 98˚.
Slide-bending Formation of Metallic Sheet Using Neural Network
Masaki Hanazono,Hikaru Nishimura,Hiroshi Harada,Yasuo Marumo,Teruo Yamaguchi 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper describes slide-bending formation of metallic sheet by using a neural network. The formation of parts made of very thin metallic sheets has become increasingly important miniaturizing industrial products, including electrical and mechanical devices. One of the authors proposed a new method called a slide-bending formation method for the bending of the metallic sheet. In this method, the shape of a metallic sheet after forming can be decided depending on various parameters. However, it is difficult to select optimal parameters. In order to solve this problem, we propose to use a neural network to determine parameters. From the results of the experiment, it is shown that both the bending angle and the curvature radius of the metallic foil can be controlled by the proposed method.
Groin lymph node detection and sentinel lymph node biopsy in vulvar cancer
Chieko Sakae,Ken Yamaguchi,Noriomi Matsumura,Hidekatsu Nakai,Yumiko Yoshioka,Eiji Kondoh,Junzo Hamanishi,Kaoru Abiko,Masafumi Koshiyama,Tsukasa Baba,Aki Kido,Masaki Mandai,Ikuo Konishi 대한부인종양학회 2016 Journal of Gynecologic Oncology Vol.27 No.6
Objective: To identify suitable diagnostic tools and evaluate the efficacy of sentinel lymphnode (SLN) biopsy for inguinal lymph node metastasis in vulvar cancer. Methods: Data from 41 patients with vulvar cancer were evaluated retrospectively, includingmagnetic resonance imaging (MRI) measurements, SLN biopsy status, groin lymph nodemetastasis, and prognosis. Results: SLN biopsy was conducted in 12 patients who had stage I to III disease. Groinlymphadenectomy was omitted in five of the nine patients with negative SLNs. All SLNnegativepatients who did not undergo groin lymphadenectomy showed no evidence ofdisease after treatment. On MRI, the long and short diameters of the inguinal node weresignificantly longer in metastasis-positive cases, compared with negative cases, in 25 patientswhose nodes were evaluated pathologically (long diameter, 12.8 mm vs. 8.8 mm, p=0.025;short diameter, 9.2 mm vs. 6.7 mm, p=0.041). The threshold of >10.0 mm for the longaxis gave a sensitivity, specificity, positive predictive value, and negative predictive value of87.5%, 70.6%, 58.3%, and 92.3%, respectively, using a binary classification test. Decisiontree analysis revealed a sensitivity, specificity, and accuracy of 87.5%, 70.6%, and 76.0%,respectively, with the threshold of >10.0 mm for the long axis on MRI. The criteria of >10.0mm for the long axis on MRI predicted an advanced stage and poorer prognosis using avalidation set of 15 cases (p=0.028). Conclusion: Minimally invasive surgery after preoperative evaluation on MRI and SLN biopsyis a feasible strategy for patients with vulvar cancer.
Role of interleukin-6 in orthodontically induced inflammatory root resorption in humans
Ryuichi Kunii,Masaru Yamaguchi,Yasuhiro Tanimoto,Masaki Asano,Kunihiko Yamada,Takemi Goseki,Kazutaka Kasai 대한치과교정학회 2013 대한치과교정학회지 Vol.43 No.6
Objective: To determine the interleukin (IL)-6 levels in gingival crevicular fluid (GCF) of patients with severe root resorption after orthodontic treatment and investigate the effects of different static compressive forces (CFs) on IL-6 production by human periodontal ligament (hPDL) cells and the influence of IL-6 on osteoclastic activation from human osteoclastic precursor (hOCP) cells in vitro. Methods: IL-6 levels in GCF samples collected from 20 patients (15 and 5 subjects without and with radiographic evidence of severe root resorption, respectively) who had undergone orthodontic treatment were measured by ELISA. The levels of IL-6 mRNA in hPDL cells and IL-6 protein in conditioned medium after the application of different uniform CFs (0, 1.0, 2.0, or 4.0 g/㎠ for up to 72 h) were measured by real-time PCR and ELISA, respectively. Finally, the influence of IL-6 on mature osteoclasts was investigated by using hOCP cells on dentin slices in a pit-formation assay. Results: Clinically, the IL-6 levels were significantly higher in the resorption group than in the control group. In vitro, IL-6 mRNA expression significantly increased with increasing CF. IL-6 protein secretion also increased in a time- and magnitude-dependent manner. Resorbed areas on dentin slices were significantly greater in the recombinant human IL-6-treated group and group cultured in hPDL cell-conditioned medium with CF application (4.0 g/㎠) than in the group cultured in hPDL cell-conditioned medium without CF application. Conclusions: IL-6 may play an important role in inducing or facilitating orthodontically induced inflammatory root resorption.