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Protection Scheme for the HK Electric's New 132kV and 22kV Busbar Configurations
Chiu, C.W.,Yeung, K.W. The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
New 132kV and 22kV GIS / Insulated busbar configurations will be adopted for HK Electric's MRS Substation. Unit busbar protection is used to ensure prompt and discriminative isolation of the faulty busbar and to minimize the supply interruption to customers. Traditional high impedance differential protection is applied as main protection for the busbars of the new 132kV and 22kV busbar configurations because it is simple, reliable and well-proven in HK Electric This paper describes a non-conventional design of the busbar protection system for the new 132kV busbar configuration with an aim to enhancing the protection availability while maintaining adequate selectivity and discrimination. For the new 22kV busbar configuration, special features like feeder common overcurrent and earth fault (OCEF) protection, rough balanced back-up OCEF protection and cross-tripping of bus-interconnector circuits are introduced to minimize the impact of abnormal conditions such as protection / circuit breaker failure during fault in the 22kV system.
Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
Akiyama, Y,Akutsu, T,Ando, M,Arai, K,Arai, Y,Araki, S,Araya, A,Aritomi, N,Asada, H,Aso, Y,Bae, S,Baiotti, L,Barton, M A,Cannon, K,Capocasa, E,Chen, C-S,Chiu, T-W,Cho, K,Chu, Y-K,Craig, K,Dattilo, V,Do Institute of Physics 2019 Classical and quantum gravity Vol.36 No.9
<P>A vibration isolation system called the Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.</P>
Sunny H.W. Chan,Meryl Y.C. Cheung,Armstrong T.S. Chiu,Mimi H.T. Leung,Michael C.C. Kuo,Donald Y.C. Yip,Carole C.Y. Hui,Sally W.I. Kam,King Yeung,Doreen S.P. Mui,Shu-Mei Wang,Calvin C.K. Yip 한국한의학연구원 2023 Integrative Medicine Research Vol.12 No.4
Background: This study aimed to investigate clinical effectiveness of a structured eight-week mindfulness-based music therapy (MBMT) program on improving mood regulation in older women with blindness. This investigation compared a MBMT group with a mindfulness intervention (MI) group and a control group. Methods: Ninety-two older females with blindness from a residential setting in Hong Kong were recruited and randomly allocated to a MBMT (n = 31), MI (n = 30), or control (n = 31) group. Psychological measurements regarding mood regulation and general mood states (namely, Difficulties in Emotion Regulation Scale [DERS], Geriatric Depression Scale [GDS], and Depression Anxiety Stress Scales-21), were taken at pretest and posttest. Outcome assessors were blinded to group assignment. Results: Data was analyzed based on intention-to-treat basis. At posttest, DERS scores in the MBMT group (mean differences and 95% confidence interval: 12.1, 5.5 to 18.8) and the MI group (7.2, 0.5 to 13.8) were lower than that in the control group. GDS scores in the MBMT group (2.9, 1.7 to 4.0) and the MI group (1.7, 0.6 to 2.9) were lower than those in the control group. Compared with the MI group, the MBMT group improved emotional awareness sub-scores in DERS (2.1, 0.2 to 4.1) and appeared to lower depression in GDS scores (1.1, -0.0 to 2.3; p = 0.053). Conclusion: MBMT seems more beneficial than MI alone for improving emotional regulation in older women with blindness. The combination of mindfulness and music can generate a synergetic effect by enhancing both attention and appraisal components within the emotional-regulation process. Trial registration: ClinicalTrials.gov, NCT05583695.
E-beam lithography and electrodeposition fabrication of thick nanostructured devices
Lo, T N,Chen, Y T,Chiu, C W,Liu, C J,Wu, S R,Lin, I K,Su, C I,Chang, W D,Hwu, Y,Shew, B Y,Chiang, C C,Je, J H,Margaritondo, G Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.10
<P>A nanofabrication approach based on advanced e-beam lithography and electrodeposition successfully produced high-resolution (≈40 nm line width) metal structures with high aspect ratio (>12) and high density. The combination of these characteristics is essential for hard-x-ray optical components such as zone plates, for x-ray lithography masks and for other devices.</P>
Non-radiative healing assessment techniques for fractured long bones and osseointegrated implant
S. Lu,B. S. Vien,M. Russ,M. Fitzgerald,W. K. Chiu 대한의용생체공학회 2020 Biomedical Engineering Letters (BMEL) Vol.10 No.1
The paper provides an overview of the fracture healing process of long bones, a review of work that proposed appropriatephysical parameters for the assessment of healing and highlights some recent work that reported on the development ofnon-radiative technique for healing assessment. An overview of the development and monitoring of osseointegration fortrans-femoral osseointegrated implant is also presented. The state of healing of a fractured long bone and the stability ofosseointegrated implants can be seen as engineering structural components where the mechanical properties are restored tofacilitate their desired function. To this end, this paper describes non-radiative techniques that are useful for healing assessmentand the stability assessment of osseointegrated implants. The achievement of non-radiative quantitative assessmentmethodologies to determine the state of healing of fractured long bones and to assess the stability of osseointegrated implantwill shorten the patient’s rehabilitation time, allowing earlier mobility and return to normal activities. Recent work on thedevelopment of assessment techniques supported by the Offi ce of Naval Research as part of the Monitoring of OsseointegratedImplant Prosthesis program is highlighted.
M.Y. Ho,P.S. Khiew,D. Isa,T.K. Tan,W.S. Chiu,C.H. Chia 한국물리학회 2014 Current Applied Physics Vol.14 No.11
In this study, a symmetric electrochemical capacitor was fabricated by adopting a lithium iron phosphate (LiFePO4)-activated carbon (AC) composite as the core electrode material in 1.0 M Na2SO3 and 1.0 M Li2SO4 aqueous electrolyte solutions. The composite electrodes were prepared via a facile mechanical mixing process. The structural properties of the nanocomposite electrodes were characterised by scanning electron microscopy (SEM) and BrunauereEmmetteTeller (BET) analysis. The electrochemical performances of the prepared composite electrode were studied using cyclic voltammetry (CV), galvanostatic chargeedischarge (CD) and electrochemical impedance spectroscopy (EIS). The experimental results reveal that a maximum specific capacitance of 112.41 F/g was obtained a 40 wt% LiFePO4 loading on an AC electrode compared with that of a pure AC electrode (76.24 F/g) in 1 M Na2SO3. The improvement in the capacitive performance of the 40 wt% LiFePO4eAC composite electrode is believed to be attributed to the contribution of the synergistic effect of the electric double layer capacitance (EDLC) of the AC electrode and pseudocapacitance via the intercalation/extraction of Hþ, OH, Naþ and SO3 2 and Liþ ions in LiFePO4 lattices. In contrast, it appears that the incorporation of LiFePO4 into AC electrodes does not increase the charge storage capability when Li2SO4 is used as the electrolyte. This behaviour can be explained by the fact that the electrolyte system containing SO4 2 only exhibits EDLC in the Fe-based electrodes. Additionally, Liþ ions that have lower conductivity and mobility may lead to poorer charge storage capability compared to Naþ ions. Overall, the results reveal that the AC composite electrodes with 40 wt% LiFePO4 loading on a Na2SO3 neutral electrolyte exhibit high cycling stability and reversibility and thus display great potential for electrochemical capacitor applications.
GALAXY CLUSTERS DISCOVERED VIA THE SUNYAEV-ZEL'DOVICH EFFECT IN THE 2500-SQUARE-DEGREE SPT-SZ SURVEY
Bleem, L. E.,Stalder, B.,de Haan, T.,Aird, K. A.,Allen, S. W.,Applegate, D. E.,Ashby, M. L. N.,Bautz, M.,Bayliss, M.,Benson, B. A.,Bocquet, S.,Brodwin, M.,Carlstrom, J. E.,Chang, C. L.,Chiu, I.,Cho, H IOP Publishing 2015 The Astrophysical journal Supplement series Vol.216 No.2
<P>We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg(2) of South Pole Telescope (SPT) data. This work represents the complete sample of clusters detected at high significance in the 2500 deg(2) SPT-SZ survey, which was completed in 2011. A total of 677 (409) cluster candidates are identified above a signal-to-noise threshold of xi = 4.5 (5.0). Ground-and space-based optical and near-infrared (NIR) imaging confirms overdensities of similarly colored galaxies in the direction of 516 (or 76%) of the xi > 4.5 candidates and 387 (or 95%) of the xi > 5 candidates; the measured purity is consistent with expectations from simulations. Of these confirmed clusters, 415 were first identified in SPT data, including 251 new discoveries reported in this work. We estimate photometric redshifts for all candidates with identified optical and/or NIR counterparts; we additionally report redshifts derived from spectroscopic observations for 141 of these systems. The mass threshold of the catalog is roughly independent of redshift above z similar to 0.25 leading to a sample of massive clusters that extends to high redshift. The median mass of the sample is M-500c(rho(crit)) similar to 3.5 x 10(14) M-circle dot h(70)(-1) 70, the median redshift is z(med) = 0.55, and the highest-redshift systems are at z > 1.4. The combination of large redshift extent, clean selection, and high typical mass makes this cluster sample of particular interest for cosmological analyses and studies of cluster formation and evolution.</P>