Nakada M.,Kanazawa Institute of Technology |
Miyano Y.,Kanazawa Institute of Technology |
Cai H.,Xi'an Jiaotong University |
Kasamori M.,Industrial Research Institute of Ishikawa
Mechanics of Time-Dependent Materials | Year: 2011
This paper deals with the prediction of long-term viscoelastic behavior of amorphous resin at a temperature below the glass transition temperature T g from measuring the short-term viscoelastic behavior at elevated temperatures based on the time-temperature superposition principle (TTSP) with vertical shift as well as horizontal shift. The long-term creep compliance as well as short-term and medium-term creep compliances were measured at elevated temperatures. The master curves of creep compliance can be constructed from measured data by shifting vertically as well as horizontally. The master curves of creep compliance constructed from measured data by short-term and medium-term creep tests agree well with those measured by long-term creep tests. Furthermore, the horizontal and vertical shift factors obtained from constructing the master curve are independent of the time period of creep tests. Therefore, the long-term viscoelastic behavior at a temperature below T g can be predicted accurately from measuring the short-term viscoelastic behavior at elevated temperatures based on the TTSP with vertical shift as well as horizontal shift. © 2011 Springer Science+Business Media, B. V.
Takano M.,Industrial Research Institute of Ishikawa |
Takimoto M.,Nikko Company |
Nakamura K.,Tokyo Institute of Technology
Acoustical Science and Technology | Year: 2011
To improve the controllability of ultrasonic linear motors in the longitudinal-bending mode, we have developed a multilayered transducer with independent electrode sets for the first longitudinal mode and the second bending mode. Since the vibration components are controlled independently by the transducer, it is possible to change only the driving vibration component with the component for friction control kept constant. The optimal shape and area of the electrodes in terms of efficiency were investigated analytically and experimentally. It was confirmed that an electrode shape in accordance with the mode strain contour gave a large output and that an optimum electrode area existed. The transducer with an optimal electrode pattern exhibited an efficiency improvement of approximately 10% and a 30% reduction of the temperature rise during motor operation. © 2011 The Acoustical Society of Japan.
Nakayama T.,Japan Advanced Institute of Science and Technology |
Hiep H.M.,Osaka University |
Furui S.,Japan National Food Research Institute |
Yonezawa Y.,Industrial Research Institute of Ishikawa |
And 3 more authors.
Analytical and Bioanalytical Chemistry | Year: 2010
DNA analysis with the polymerase chain reaction (PCR) has become a routine part of medical diagnostics, environmental inspections, food evaluations, and biological studies. Furthermore, the development of a microscale PCR chip is an essential component of studies aimed at integrating PCR into a micro total analysis system (μ-TAS). However, the occurrence of air bubbles in microchannels complicates this process. In this study, we investigated a new technique based on the fluid dynamics of laminar flow that utilizes a small amount of mineral oil at the beginning of sample injection to prevent air bubbles from occurring in microchannels. We also further optimized the pressure, the length of the pressurizing channel and the volume of oil, thus making our microfluidic device more useful for high-temperature PCR. Additionally, quantitative continuous-flow PCR was performed using the optimized PCR chip in order to detect genetically modified (GM) maize. DNA was extracted from GM maize, MON 810, and non-GM maize at several concentrations from 0% (w/v) to 100% (w/v). The DNA amplification signals were then analyzed on the PCR chip using a laser-based system. The signal from our microfluidic PCR chip was found to increase in direct proportion to the initial GM maize concentration. © 2009 Springer-Verlag.
Arite T.,Ishikawa Prefectural University |
Arite T.,Industrial Research Institute of Ishikawa |
Kameoka H.,University of Tokyo |
Kyozuka J.,University of Tokyo
Journal of Plant Growth Regulation | Year: 2012
Strigolactones are recently identified plant hormones that inhibit shoot branching. Pleiotropic defects in strigolactone-deficient or -insensitive mutants indicate that strigolactones control various aspects of plant growth and development. However, our understanding of the hormonal function of strigolactones in plants is very limited. In this study we demonstrate that rice dwarf mutants that are strigolactone-deficient or -insensitive exhibit a short crown root phenotype. Exogenous application of GR24, a synthetic strigolactone analog, complemented the crown root defect in strigolactone-deficient mutants but not in strigolactone-insensitive mutants. These observations imply that strigolactones positively regulate the length of crown roots. Histological observations revealed that the meristematic zone is shorter in dwarf mutants than in wild type, suggesting that strigolactones may exert their effect on roots via the control of cell division. We also show that crown roots of wild type, but not dwarf mutants, become longer under phosphate starvation. © 2011 Springer Science+Business Media, LLC.
Yasui H.,Industrial Research Institute of Ishikawa |
Taki M.,Onward Ceramic Coating Co. |
Hasegawa Y.,Onward Ceramic Coating Co. |
Takago S.,Industrial Research Institute of Ishikawa
Surface and Coatings Technology | Year: 2011
Because high density DLC (HD-DLC) films prepared using filtered arc deposition (FAD) systems possess high hardness, low friction coefficients, and a smooth surface, they have been good candidates for use in tribological applications. The aim of present work is the investigation of the mechanical and structural properties of HD-DLC films.The experimental conditions were the following: arc current, 50A; base pressure, less than 3×10-3Pa; substrate bias, DC-100V; substrate temperature, less than 100°C. The HD-DLC films were formed on silicon wafers and tungsten carbide (WC) substrates. The film properties of hardness, composition, structure, and friction were analyzed.The film hardness is high, 80?-90. GPa, with a low friction coefficient of less than 0.1. © 2011 Elsevier B.V.
Yagitani S.,Kanazawa University |
Katsuda K.,Kanazawa University |
Nojima M.,Kanazawa University |
Yoshimura Y.,Industrial Research Institute of Ishikawa |
Sugiura H.,Industrial Research Institute of Ishikawa
IEICE Transactions on Communications | Year: 2011
A thin electromagnetic band-gap (EBG) absorber is employed to capture the 2-d image of radio-frequency (RF) power distribution. The EBG absorber consists of an array of mushroom unit cells formed on a thin dielectric substrate with a metal backplane, and lumped resistors interconnecting the surface patches of the mushrooms. Around the resonance frequency at which the EBG structure acts as a high-impedance surface, the RF power incident on the surface is absorbed by the lumped resistors which are matched with the incident wave impedance. By detecting directly the amounts of power consumed by the individual resistors, an "RF power imager" can be constructed which captures the 2-d distribution of the RF power illuminating the EBG surface, where polarization discrimination is possible. The resonance (i.e., absorption) frequency is made tunable by adding varactor diodes in parallel with the lumped resistors. The EBG absorber tunable in the frequency range of 700 MHz-2.7 GHz is designed and fabricated, and its performance is evaluated by an equivalent-circuit analysis, simulation and measurement. It is shown that the small resistance of the varactors have a considerable effect on the absorption performance. RF power distributions radiated from a dipole antenna are successfully measured by a matrix of sensitive power detectors installed on the backside of the absorber. Using such an RF power imager, the power distributions of even impulsive RF signals and/or noises can be captured and visualized in situ and in real-time, while the electromagnetic environment is almost undisturbed by the EBG absorber. © 2011 The Institute of Electronics, Information and Communication Engineers.
Gabr M.H.,Kanazawa Institute of Technology |
Gabr M.H.,Sohag University |
Okumura W.,Industrial Research Institute of Ishikawa |
Ueda H.,Industrial Research Institute of Ishikawa |
And 3 more authors.
Composites Part B: Engineering | Year: 2015
The effect of organoclay on the mechanical and thermal properties of woven carbon fiber (CF)/compatibilized polypropylene (PPc) composites is investigated. Polypropylene-organoclay hybrids nanocomposites were prepared using a maleic anhydride-modified PP oligomer (PP-g-MA) as a compatibilizer. Different weight percentages of Nanomer® I-30E nanoclay were dispersed in PP/PP-g-MA (PPc) using a melt mixing method. The PPc/organoclay nanocomposite was then used to manufacture plain woven CF/PPc nanocomposites using molding compression process. CF/PPc/organoclay composites were characterized by different techniques, namely; dynamic mechanical analysis (DMA), fracture toughness and scanning electron microscope. The results revealed that at filler content 3% of organoclay, initiation and propagation interlaminar fracture toughness in mode I were improved significantly by 64% and 67% respectively, which could be explained by SEM at given weight as well; SEM images showed that in front of the tip, fibers pull out during initiation delamination accounting for fracture toughness improvement. Dynamic mechanical analysis showed enhancement in thermomechanical properties. With addition 3 wt.% of organoclay, the glass transition temperature increased by about 6°C compared to neat CF/PPc composite indicating better heat resistance with addition of organoclay. © 2014 Elsevier Ltd. All rights reserved.
Takano M.,Industrial Research Institute of Ishikawa
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C | Year: 2011
To increase the applicability of ultrasonic linear motors, we have developed a holding mechanism for the transducer using parallel leaf springs. The present mechanism is compact since the parallel leaf spring structure has functions for both holding and preloading at the same time. Also, a special design for the spring characteristics provides a non-linear load-displacement region with buckling phenomena. These results in a constant preload for some range of the displacement, then the motor performance does not alter even after abrasion of contact surfaces. In this report, the relationship between the dimension of the leaf spring and the force-displacement curves was investigated in order to obtain the design appropriate for constant preloading. Moreover, the effect of the vibration reduction by the holding mechanism was investigated theoretically and experimentally. The vibration reduction was as small as less than 10 % since the stiffness in terms of the vibration direction was relatively small. Finally, the dynamic responses of the motor with the holding mechanism were measured for a sinusoidal control signal. No prominent peak was observed in the motor's responses, however, the motor velocity change was distorted near the natural frequency of the holding mechanism. © 2011 The Japan Society of Mechanical Engineers.
Sato Y.,Osaka University |
Tsukamoto M.,Osaka University |
Yamashita Y.,Industrial Research Institute of Ishikawa
Applied Physics B: Lasers and Optics | Year: 2015
A plate made of Ti–6Al–4V (Ti64) was built by vacuum selective laser melting (SLM) at a pressure of 10−2 Pa. The vacuum SLM system employed a single-mode fiber laser and three-axis galvanic mirror in order to form 3D metallic structure. In order to investigate the surface morphology on the fabricated plates, Vickers microhardness and surface roughness Ra were measured. From the results, the Vickers microhardness of the fabricated plates was recorded at 391 HV, higher than the typical 340 HV for a Ti64 plate. It was also determined that crystal orientation was evaluated with X-ray diffraction. From the results, the crystal orientation of powder is composed mainly of martensitic alpha. Diffraction peaks corresponding to β (110) were detected in vacuum SLM processed samples. © 2015 Springer-Verlag Berlin Heidelberg
News Article | November 8, 2016
Over 400 attendees from 20 countries gathered from October 16-20, 2016 at the Sheraton® San Diego in San Diego, CA, for the 2016 Laser Institute of America’s International Congress on Applications of Lasers & Electro-Optics (ICALEO®). Gathering a highly engaged group of field veterans, new registrants and students, this year’s ICALEO featured more than 200 presentations, 59 peer-reviewed talks, comprehensive biophotonics coverage, and the introduction of the new ICALEO mobile app. Returning Congress General Chair Silke Pflueger was back at the helm helping compile the most highly-rated Opening Plenary presentations delivered at an ICALEO conference thus far. “We worked so hard this year to ensure, ICALEO 2016 once again exceeded all expectations,” said Pflueger. “Our opening plenary session is a great example. From visiting Mars, to self-driving cars and a LIGO revisit, we inspired new outlooks and forged new relationships, which is what ICALEO is all about.” Opening plenary speakers included Nina Lanza from Los Alamos National Laboratory, who linked humanity together in her discussion about the laser used aboard the Opportunity rover on Mars, and Jim McBride from Ford Motor Company, who talked about the challenges of sensing on fully autonomous vehicles. Albert Lazzarini, Deputy Director of LIGO Laboratory at California Institute of Technology, presented breaking results regarding black holes made from the first gravitational waves detected by LIGO. This year’s ICALEO also featured a variety of laser research and experimentation revelations, from the use of lasers in emerging areas, like paint stripping and dairy, to microprocessing and several new opportunities in wearables and medicine. Other highlights include LIA Executive Director Peter Baker’s honor as the first recipient of the new LIA Leadership Award. Retiring next April, Baker commented on his meaningful career: “At LIA we’re saving eyesight, preventing skin damage, and helping create laser technologies, products, and services that make the world a better place.” The 2016 Arthur L. Schawlow Award was awarded to Yongfeng Lu, the Lott Distinguished Professor of Engineering at the University of Nebraska-Lincoln, LIA Board Member, Past President, Treasurer and Fellow. LIA also honored Silke Pflueger and Neil Ball by elevating them to the highest level of membership as LIA Fellows. By unanimous decision, the first place ICALEO Poster Award went to Kohei Asano and his colleagues from Osaka University, the Industrial Research Institute of Ishikawa, and Yamazaki Mazak Corporation in Japan for their poster Copper Layer Formation Produced with 100W Blue Direct Diode Laser System, while the first place Student Paper Award winner was Christian Hagenlocher from IFSW in Stuttgart, Germany, for his paper Space and Time Resolved Determination of Thermomechanical Deformation Adjacent to the Solidification Zone during Hot Crack Formation in Laser Welding. As the 35th ICALEO ended, Neil Ball, newly-honored LIA Fellow, called the breakthrough laser event, “bar none, the best networking opportunity and the best opportunity to look forward and see what applications are on the horizon.” Ken Dzurko, General Manager of SPI Lasers said, “LIA does a great job creating a comfortable, relaxed mood right for exchanging ideas at this one-of-a-kind event that’s really the world’s premier gathering of scientists interested in laser applications.” ICALEO 2016 proceedings are available for sale at http://www.lia.org/store. For more information on ICALEO 2017, held Oct 22-26 in Atlanta, GA, visit http://www.lia.org/conferences/icaleo. The Laser Institute of America (LIA) is the professional society for laser applications and safety serving the industrial, educational, medical, research and government communities throughout the world since 1968. http://www.lia.org, 13501 Ingenuity Drive, Ste 128, Orlando, FL 32826, +1.407.380.1553.