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Search Results: 1 - 10 of 783 matches for " Masaaki Tachioka "
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Ohmic Contact Formation for n+4H-SiC Substrate by Selective Heating Method Using Hydrogen Radical Irradiation  [PDF]
Tetsuji Arai, Kazuki Kamimura, Chiaya Yamamoto, Mai Shirakura, Keisuke Arimoto, Junji Yamanaka, Kiyokazu Nakagawa, Toshiyuki Takamatsu, Masaaki Ogino, Masaaki Tachioka, Haruo Nakazawa
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51005
We developed an apparatus for producing high-density hydrogen plasma. We confirmed that the temperatures of transition-metal films increased to above 800?C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of W/Ni films deposited on n+4H-SiC wafers and formed nickel silicide electrodes. To utilize this method, we can perform the nickel silicidation process without heating the other areas such as channel regions and improve the reliability.
Adaptive Parallel Particle Swarm Optimization Algorithm Based on Dynamic Exchange of Control Parameters  [PDF]
Masaaki Suzuki
American Journal of Operations Research (AJOR) , 2016, DOI: 10.4236/ajor.2016.65037
Abstract: Updating the velocity in particle swarm optimization (PSO) consists of three terms: the inertia term, the cognitive term and the social term. The balance of these terms determines the balance of the global and local search abilities, and therefore the performance of PSO. In this work, an adaptive parallel PSO algorithm, which is based on the dynamic exchange of control parameters between adjacent swarms, has been developed. The proposed PSO algorithm enables us to adaptively optimize inertia factors, learning factors and swarm activity. By performing simulations of a search for the global minimum of a benchmark multimodal function, we have found that the proposed PSO successfully provides appropriate control parameter values, and thus good global optimization performance.
A Study on Flow Structure around a Bridge Beam and Behavior of Sea Water Mist  [PDF]
Masaaki Ishikawa
Open Journal of Fluid Dynamics (OJFD) , 2017, DOI: 10.4236/ojfd.2017.73022
Abstract: Okinawa in the subtropical islands enclosed in the ocean has a problem that corrosion of structures progresses quickly because of high temperature, high humidity and adhesion of sea-water mists flying from sea. Author is interested in corrosion of bridge made of weatherability steel. Therefore, it needs to investigate the flow structure around bridge beams and behavior of sea-water mist (droplet). In this paper, flow visualization and PIV are attempted to understand the flow structures around bridge beams and, furthermore, numerical approach of motion of droplets is attempted to understand the collision of sea-water mists on the bridge wall.
Intravesical Non-Alkalinized Lidocaine Instillation for Interstitial Cystitis/Bladder Pain Syndrome Patients  [PDF]
Teiichiro Aoyagi, Masaaki Tachibana
Open Journal of Urology (OJU) , 2012, DOI: 10.4236/oju.2012.24040
Abstract: Purpose: The effectiveness of daily or weekly instillation of non-alkalinized lidocaine for patients suffering interstitial cystitis and/or bladder pain syndrome was evaluated retrospectively. Patients and methods: Five female patients (40 - 71 years old) diagnosed as interstitial cystitis by cystoscopic findings and a 68 year-old bladder pain syndrome patient were enrolled. All patients, having interstitial cystitis, had undergone hydrodistention therapy previously and had not improved their symptoms by empirical therapies. Daily or weekly (upon their severity of symptoms) intravesical instillation of 20 ml of 4% non-alkalinized (pH 6.0 - 7.0) lidocaine solution was performed for several times, and patients were asked to keep them in the bladder as long as two hours each time. Previous medications such as anti-cholinergic drugs and analgesics were continued according to patient's requirements and symptoms. The treatment effect was evaluated comparing O'Leary-Sant Symptom Index for interstitial cystitis patients and visual analog pain scale before and after the series of lidocaine therapies. Results: Instillation was made 6 to 16 times. Patients with interstitial cystitis improved their symptoms from O'Leary-Sant Symptom Index 17.5 to 10, Problem Index from 14.8 to 6 in an average. Crouching pain disappeared in all these patients after the instillation therapy. Severe interstitial cystitis findings on cystoscopy disappeared completely in one patient after the therapy. One patient having bladder pain syndrome reduced her analgesics use, and bladder-filling pain decreased from 7 to 3 as a visual analog scale score. One patient complained palpitation at 11th instillation and abandoned treatment thereafter, otherwise, none of these patients showed side effect concerning lidocaine toxicity. Conclusions: Intravesical non-alkalinized lidocaine instillation therapy for interstitial cystitis/bladder pain syndrome patients were an easy, safe and effective treatment.
Formulation of a Preconditioned Algorithm for the Conjugate Gradient Squared Method in Accordance with Its Logical Structure  [PDF]
Shoji Itoh, Masaaki Sugihara
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.68131
Abstract: In this paper, we propose an improved preconditioned algorithm for the conjugate gradient squared method (improved PCGS) for the solution of linear equations. Further, the logical structures underlying the formation of this preconditioned algorithm are demonstrated via a number of theorems. This improved PCGS algorithm retains some mathematical properties that are associated with the CGS derivation from the bi-conjugate gradient method under a non-preconditioned system. A series of numerical comparisons with the conventional PCGS illustrate the enhanced effectiveness of our improved scheme with a variety of preconditioners. This logical structure underlying the formation of the improved PCGS brings a spillover effect from various bi-Lanczos-type algorithms with minimal residual operations, because these algorithms were constructed by adopting the idea behind the derivation of CGS. These bi-Lanczos-type algorithms are very important because they are often adopted to solve the systems of linear equations that arise from large-scale numerical simulations.
Luminescent Characteristic of Organic Compound-Containing Inorganic Crystal at Room Temperature  [PDF]
Norihito Doki, Masaaki Yokota
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.54045
Abstract: The luminescent functional crystal was produced by the organic guest molecules conformation control in the inorganic host crystal matrix. Inorganic host-organic guest crystals were successfully prepared and luminescence spectra were investigated. These crystals had a phosphorescent property in room temperature by 254 nm UV irradiation. In this system, the potassium sulfate host matrix was effectively inhibited the molecular vibration of organic guest molecules by interaction between K+ and π-electrons. In addition, control of the luminescence wavelength (both fluorescence and phosphorescence) was achieved by controlling the structure of organic molecules which were taken in anorganic compound-containing inorganic crystal. Specifically, theorganic compound-containing inorganic crystals with 2-aminobenzenesulfonic acid and 2-naptylamine-1-sulfonic acid as a guest had a phosphorescence band of 455 nm and 510 nm, respectively.
Comparative Investigation of Alternative Negative Staining Reagents in Bacterial Morphological Study  [PDF]
Masaaki Minami, Hiroshi Takase
Journal of Biosciences and Medicines (JBM) , 2017, DOI: 10.4236/jbm.2017.510002
Abstract: Negative staining is an effective method that can be used for electron microscopic study to observe fine structural morphology without destruction of bacterial structure. Although uranium acetate is used worldwide as a general dyeing solution, it is extremely difficult to use it by a new purchase at a research institution because it falls under the nuclear regulation substance in Japan. Therefore, we examined alternative reagents for negative staining that could replace uranium acetate through bacterial observation with an electron microscope. Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Streptococcus pyogenes were examined by four stain reagents (phosphotungstic acid (PTA), EMstainer, TI blue, and uranium acetate). Pre cultured bacteria were stained with each stain reagents on a copper grid, washed with PBS, and observed with a transmission electron microscope. In the comparison between bacterial structures, the cell wall structure and bacterial flagella could be observed well in the order of PTA, EMstainer, and uranium acetate. With TI blue staining, flagella could be observed very poorly. In comparison between bacteria, gram negative bacteria such as Escherichia coli and Pseudomonas aeruginosa, could be observed well as compared with gram positive cocci such as Staphylococcus aureus and Streptococcus pyogenes. The uranium acetate looked very coarse in background particles. Since crystals tend to precipitate, TI blue also required filtering, and electron beams were absorbed by the agglomerated crystals, and the frequency of electronic burning occurred high frequency. In this study, there was clear difference in the observation conditions depending on the type of bacteria and the kind of the staining reagents. Especially, it was confirmed that good negative staining features of Pseudomonas aeruginosa by electron microscope were obtained by PTA and EMstainer staining. These alternative reagents are considered to be a candidate for a negative staining.
Biodegradation of Polymethylmethacrylate Bone Cement May Not Be a Serious Issue in Total Hip Arthroplasty—Retrieval Study for Knoop Hardness and Young’s Modulus  [PDF]
Masaaki Maruyama, William N. Capello
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.36050
Abstract: Introduction: To investigate a long-term in vivo deterioration of polymethylmethacrylate (PMMA) bone cement over time, we evaluated retrieved PMMA cement in terms of chemical elements presenting in the cement using energy dispersive analysis of X-rays; Knoop hardness; and the Young’s modulus using scanning acoustic microscopy. Materials and Methods: For mechanical evaluation, we could neglect the influences of entrapped air bubbles or blood by the use of small specimens. The study was based on thirteen cement samples (six used in the acetabulum and seven in the femur) derived from eight patients (age at revision surgery: mean 72.5, range 68 to 79). All of these samples were Simplex-P?cement. They were functioning well at least ten years after the previous surgery. Duration until revision surgery was ranged 12 to 25 years (average, 17.4 years). The reason for revision was aseptic mechanical loosening. Twenty samples of Simplex-Preg; cement were served by manually mixing as a control. Results: The average of the hardness of the cement was 17.0 ± 1.2 (range, 13.4-20.6). In the control, the hardness was 17.8 ± 1.5 (range, 14.0-24.6). There was no significant difference between these values. The mean of Young’s modulus of the cement was 5.61 ± 0.19 GPa (range, 5.09-6.10). In the control, the modulus was 6.04 ± 0.13 GPa (range, 5.68-6.45). Although the modulus was significantly less than that of the control, there was only 7% decrease in average between twelve and twenty-five years in vivo. Conclusions: Our results suggest that long-term implantation and functional loading in vivo
Teachers’ Professional Identities in an Era of Testing Accountability in Japan: The Case of Teachers in Low-Performing Schools
Masaaki Katsuno
Education Research International , 2012, DOI: 10.1155/2012/930279
Abstract: This paper presents tentative findings and discussions arising from an ongoing study on whether and how Japanese teachers’ professional identities have shifted in the context of heightened testing accountability. After a brief description of policy development that led to the introduction of national testing in 2007, previous studies of teacher identity are reviewed. Having explored some ambiguity in the existent theories regarding the trajectories and consequences of identity work, the paper goes on to report and to analyse the cases of six teachers from three low-performing elementary schools in a northern Japanese administrative region. With the limited size and scope of the sample, the present research cannot claim generalisability, but it can still raise a number of theoretical issues for further investigation, such as the precariousness of teachers’ strategies for sustaining their professional identities and the need for locating teachers’ identity work in the micropolitics of schools.
Gold-activated zinc sulphide phosphors
Masaaki Tamatani
Gold Bulletin , 1980, DOI: 10.1007/BF03216546
Abstract: Over the past few years, phosphors of the gold-activated zinc sulphide type have been developed for use in television tubes. They are now applied for this purpose on a large scale by manufacturers in Japan and, as a result, their luminescence is a familiar feature in homes throughout the world. The scientific and technical background to the development of these products is presented here and their applications are described.
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