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Optical Technique to Measure Five-Degree-of-Freedom Error Motions for a High-Speed Microspindle
Hiroshi Murakami1,Norio Kawagoishi,Eiji Kondo,Akira Kodama 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
We present an optical technique to measure five-degree-of-freedom error motions of a high-speed microspindle. The measurement system consists of a rod lens, a ball lens, four divided laser beams, and multiple divided photodiodes. When the spindle rotates with its concomitant rotation errors, the rod and ball lenses, which are mounted to the chuck of the spindle, are displaced, and this displacement is measured using an optical technique. For this study, we decide the design parameters of the optical system using ray tracing, fabricate a prototype of the measurement system, and evaluate it experimentally. The results show that the measurement system has a resolution of 5 nm and can be used to evaluate high-speed microspindle rotation errors.
Near Net Shape Processing of RE-Ba-Cu-O Bulk Superconductors
Murakami M.,Fujishiro M.,Miyazaki T.,Nariki S.,Sakai N.,Hirabayashi I. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Several practical applications of melt-textured bulk superconductors require the complex-shaped products such as curved, ring-shaped, and drilled blocks rather than simple shaped pellets. However, melt-textured bulk superconductors are often damaged when they are cut, grinded, or drilled. With the aim of reducing such damages, we have investigated the preparation of the complex-shaped bulk superconductors by previously machining binder-added precursors and pre-sintered precursors. We could produce various complex-shaped bulk superconductors without cracking from these machined precursors
Anti-Tumor and Immunoregulatory Effects of Fermented Papaya Preparation (FPP: SAIDO-PS501)
Murakami, Shinki,Eikawa, Shingo,Kaya, Savas,Imao, Mitsuko,Aji, Toshiki Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.7
Various beneficial effects have been described for fermented papaya preparation (FPP: SAIDO-PS501) based on its anti-oxidative and anti-inflammatory functions. The present study was designed to determine the effects of FPP on carcinogenesis in vivo, and immunomodulatory function in vitro. Mice were injected with RL male 1 cells subcutaneously or 3-methylcholantherene (MCA) intravenously to induce cancer and orally or intraperitoneally treated with FPP solution. Human peripheral blood mononuclear cells (PBMC) were obtained from healthy volunteers and patients with atopic dermatitis, treated with FPP, and subjected to measurement of cytokine production and changes in Foxp3-expressing regulatory T cell (Treg) stimulated with phytohemagglutinin (PHA). Administration of FPP suppressed tumor size and the incidence of malignancy. In vitro, treatment of PBMC with FPP induced IL-$1{\beta}$, $TNF{\alpha}$ and $IFN{\gamma}$ production. Moreover, FPP suppressed proliferation of PHA-stimulated Foxp3-expressing Treg. These results suggest that FPP has chemotherapeutic properties.
Erratum to 'Some Limits of the Colored Jones Polynomials of the Figure-eight Knot'
Murakami, Hitoshi Department of Mathematics 2016 Kyungpook mathematical journal Vol.56 No.2
In [3] the main theorem was erroneously stated. We needed to assume that the irrationality measure of 1/r is finite to prove the theorem.
Murakami, Katsuhisa,Rommel, Mathias,Hudec, Boris,Rosová,, Alica,Huš,eková,, Kristí,na,Dobroč,ka, Edmund,Rammula, Raul,Kasikov, Aarne,Han, Jeong Hwan,Lee, Woongkyu,Song, S American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.4
<P>Topography and leakage current maps of TiO<SUB>2</SUB> films grown by atomic layer deposition on RuO<SUB>2</SUB> electrodes using either a TiCl<SUB>4</SUB> or a Ti(O-i-C<SUB>3</SUB>H<SUB>7</SUB>)<SUB>4</SUB> precursor were characterized at nanoscale by conductive atomic force microscopy (CAFM). For both films, the leakage current flows mainly through elevated grains and not along grain boundaries. The overall CAFM leakage current is larger and more localized for the TiCl<SUB>4</SUB>-based films (0.63 nm capacitance equivalent oxide thickness, CET) compared to the Ti(O-i-C<SUB>3</SUB>H<SUB>7</SUB>)<SUB>4</SUB>-based films (0.68 nm CET). Both films have a physical thickness of ∼20 nm. The nanoscale leakage currents are consistent with macroscopic leakage currents from capacitor structures and are correlated with grain characteristics observed by topography maps and transmission electron microscopy as well as with X-ray diffraction.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-4/am4049139/production/images/medium/am-2013-049139_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4049139'>ACS Electronic Supporting Info</A></P>
Setting the scene: CFD and symposium overview
Murakami, Shuzo Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.2
The present situation of CWE(Computational Wind Engineering) and the papers presented to the CWE 2000 Symposium are reviewed from the following viewpoints; 1) topics treated, 2) utilization of commercial code (software), 3) incompleteness of CWE, 4) remaining research subjects, 5) prediction accuracy, 6) new fields of CWE application, etc. Firstly, new tendencies within CWE applications are indicated. Next, the over-attention being given to the application field and the lack of attention to fundamental problems, including prediction error analysis, are pointed out. Lastly, the future trends of CFD (Computational Fluid Dynamics) applications to wind engineering design are discussed.