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Permanent Magnet Synchronous Condenser for Wind Power Plant Grid Connection Support
Ping Hsu,Eduard Muljadi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A synchronous condenser (SC) using a permanent magnet synchronous generator (PMSG) is proposed for providing necessary reactive power to a wind power plant to support its connection to a weak grid. A PMSG has the advantage of higher efficiency and reliability. Because of its lack of a field winding, a PMSG is typically controlled by a full-power converter, which can be costly. In the proposed system, the reactive power of the SC is controlled by a serially connected compensator operating in a closed-loop configuration. The compensator also damps the PMSG’s tendency to oscillate. The compensator’s VA rating is only a fraction of the rating of the SC and the PMSG. In this initial investigation, the proposed scheme is shown to be effective by computer simulations.
Fabrication of semi-transparent super-hydrophobic surface based on silica hierarchical structures
Ping-Hei Chen,Chin-Chi Hsu,Pei-Shan Lee,Chao-Sung Lin 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.1
This study successfully develops a versatile method of producing superhydrophobic surfaces with micro/nano-silica hierarchical structures on glass surfaces. Optically transparent super hydrophobic silica thin films were prepared by spin-coating silica particles suspended in a precursor solution of silane, ethanol, and H_2O with molar ratio of 1:4:4. The resulting super hydrophobic films were characterized by scanning electron microscopy (SEM), optical transmission, and contact angle measurements. The glass substrates in this study were modified with different particles: micro-silica particles, nano-silica particles, and hierarchical structures. This study includes SEM micrographs of the modified glass surfaces with hierarchical structures at different magnifications.
Assistive Control of a Surgical Robot Based on Bilateral Interacted Force Analysis
Ping-Lang Yen,Shang-Wei Hsu,Hang-Ting Lin,Ching-Heng Wang 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Interacted force between a robot, human and anatomical object in orthopedic surgery provides crucial information for safe and accurate bone cutting. When the robot plays the role of assisting the surgeon in the whole surgical procedure, the robot is trying to comply with the human intention according to various cutting conditions. The reaction force to the robot from the human is for indicating human intention, whereas the force from the anatomical object reflects the cutting condition. In this paper two impedance indices are defined by these two interacted forces and a surgical robot then decides whether assistive or resistant action is activated so that accuracy and safety of bone cutting can be achieved.
Ping-Cheng Chen,Chung-Long Pan,Kuei-Chih Lin,Chun-Hsu Shen 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
The lower phase-forming temperature of magnesium titanate, MgTiO3, means that it can be used to replace magnesium ionswith cobalt ions at 0.05 mole when a mixture of diverse low melting point materials as sintering accelerators is employed(single: B2O3, CuO, V2O5, ZnO; binary: ZnO-B2O3). The phase formation of 0.9Mg0.95Co0.05TiO3 - 0.1 Ca0.61Nd0.78/3TiO3 dielectricceramics was verified using XRD diffraction to observe crystallites at different phases. SEM was used to observe the graingrowth of the ceramic system, and the composition ratio of the grain was analyzed via EDS. Compared with 0.9Mg0.95Co0.05TiO3- 0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics without the addition of a sintering accelerator, the results show that the sinteringtemperature could be effectively decremented, and the results of the binary addition were better than the single result. Themicrowave dielectric performances of 0.9Mg0.95Co0.05TiO3 - 0.1Ca0.61Nd0.78/3TiO3 dielectric ceramics were closely related tothe density and growth of grains experienced by the specimens. When 1 wt% binary sintering accelerators (ZnO-B2O3) wereadded to 0.9Mg0.95Co0.05TiO3-0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics, they showed an εr value of 21.7, a Qf value of 42,000 GHz,and a τf value of -27.2 ppm/oC; the phase-forming temperature was minimized from 1350 oC to 1150 oC.
Determine the robot assistive forces based on human intent estimation in bone cutting applications
Shang-Wei Hsu,Ping-Lang Yen 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
Robots can provide real-time bone cutting assistance on various operational conditions. A human intent estimation together with a bilateral force control has been designed to assist the surgeon in total knee replacement. Different admittance gains are online adjusted based on estimated human intent, followed by the robot to exert appropriate forces to the cutter, either pushing or pulling forces so that the bone cutting can be carried out in easier, safer and more precise way. Experiments show that the proposed control structure is promising to meet the clinical needs for real-time bone cutting assistance.
Chih-Chieh Hsu,He-Ping Chen,Wei-Chieh Ting 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
was studied by using numerical simulations. The electrical characteristics of the triodes with V2O5 doping concentrations of 1016 − 1018 cm −3 and electrode work functions (WFs) of 4.4 − 5.1 eV were simulated. In addition, the corresponding physical mechanisms were investigated by quantitatively analyzing the energy band diagram, carrier distribution, injection and transports which were difficult to measure and obtain experimentally. The optimal triode performance was obtained for a doping concentration of V2O5 of 2 × 1017 cm −3 and WFs of the emitter and the collector electrodes of 5.1 eV and 4.8 eV, respectively. The simulation results were reasonable when compared with experimental data reported by other groups.
Successful Enrichment of Rarely Found Candidatus Anammoxoglobus propionicus from Leachate Sludge
( Shu Chuan Hsu ),( Yen Chun Lai ),( Ping Heng Hsieh ),( Pun Jen Cheng ),( Suen Shin Wong ),( Chun Hsiung Hung ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.7
Bacteria that mediate the anaerobic oxidation of ammonium (anammox) have been detected in natural ecosystems, as well as various wastewater treatment systems. In this study, sludge from a particular landfill leachate anaerobic treatment system was selected as the incubation seed for anammox microorganism enrichment owing to its possible anammox activity. Transmission electron microscopy observation, denaturing gradient gel electrophoresis analysis, and cloning/sequencing techniques were applied to identify the diversity of anammox microorganisms throughout the incubation. During the early stage of operation, the diversity of anammox microorganisms was similar to the original complex microbes in the seed sludge. However, as incubation time increased, the anammox microorganism diversity within the system that was originally dominated by Candidatus (Ca.) Brocadia sp. was replaced by Ca. Anammoxoglobus propionicus. The domination of Ca. Anammoxoglobus propionicus produced a stable removal of ammonia (70 mg-N/l) and nitrite (90 mg-N/l), and the total nitrogen removal efficiency was maintained at nearly 95%. The fluorescence in situ hybridization results showed that Ca. Anammoxoglobus propionicus was successfully enriched from 1.8 ± 0.6% initially to 65 ± 5% after 481 days of operation. Therefore, the present results demonstrated the feasibility of enriching Ca. Anammoxoglobus propionicus from leachate sludge, even though the original cell count was extremely low. Application of this seldom found anammox organism could offer an alternative to current ammonia-nitrogen treatment.