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The relationship of maxillary canines to the facial anatomical landmarks in a group of Thai people
Sharafat Hossain,Chuchai Anunmana,Potchaman Sinavarat 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE The objective was to evaluate canine positions, intercanine tip width (ICTW) and width of distal surface of canine (WDC), related to facial landmarks including interalar width (IAW), intercommissural width (ICoW), and distance between left and right projection lines drawn from inner canthus of eyes to alae of the nose (DPICa) in a group of Thai. MATERIALS AND METHODS One hundred Thai subjects aged 18-35 years were selected. IAW and ICoW were measured on subject's face using digital vernier caliper. Irreversible hydrocolloid impression of the upper arch was taken, and a cast was poured with dental stone. Silicone impression material was used to take imprint of the incisal edge of upper six anterior teeth. DPICa was obtained from the subject's face using custom-made measuring equipment and marked on the silicone incisal imprint. The marks were then transferred from the imprint to the stone cast and measured with digital caliper. The ICTW and WDC were also measured on the stone cast. Pearson's correlation was used to determine the correlation. RESULTS The results revealed that the correlation between ICTW-ICoW was 0.429 and ICTW-DPICa was 0.573. The correlation between WDC-ICoW was 0.426 and WDC-DPICa was 0.547. However, IAW did not show any correlation with ICTW or WDC (P>.05). CONCLUSION The correlation between canine position and facial landmarks was found. ICTW and WDC had relationship with ICoW and DPICa. DPICa showed stronger correlation with the position of maxillary canine than that of ICoW.
Battery Energy Storage System-Based Stabilizers for Power System Oscillations Damping
Muhammad Arif Sharafat Ali,Khawaja Khalid Mehmood,Ji-Kyung Park,Chul-Hwan Kim 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.10
To ensure secure and reliable operations of power systems, rapid damping of power system oscillations is unavoidable. This paper addresses the improved damping characteristics of a power system by integrating the Energy Storage System (ESS) such as a battery into a Flexible AC Transmission System (FACTS) device named the Battery Energy Storage System (BESS). Design of the BESS-based stabilizers is created to enhance the power system dynamic stability and damping profile. A modified Philips-Heffron model of a Single Machine Infinite Bus bar (SMIB) power system with BESS is established and analyzed. Improved damping characteristics of the power system oscillations are selected as performance criteria for the proposed design. Simulation results show the superior performance of the proposed design as compared to the coordinated design of BESS and conventional Power System Stabilizers (PSS). All the simulations are carried out in MATLAB/SIMULINK.
Resin Capacity of Technical Woven Fabrics: Pore Volume and Pore Shape Simulation
Hamid Reza Sharafat,Mehdi Kamali Dolatabadi,Ali. A. A. Jeddi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
Nowadays, technical woven fabrics are broadly utilized as reinforcement of composites. Resin capacity of wovenfabric is one of the main challenges in laminate fabrication. Resin diffusion during fabrication of the composite is extremelydepended on fabric micro-morphology. The geometry of weave unit cell and its pore are fundamental factors in evaluatingresin capacity and resin diffusion within fabrics. The main attempt of this study was obtaining an approach to evaluate resincapacity of a woven fabric via simulating pore shape and pore volume. For this purpose, four basic unit cells for all kind ofweaves were simulated with the two shapes of tow cross-section: lens and racetrack. Afterwards, 3D shape and volume oftheir pores were simulated using this approach. The proposed approach is established on the base of initial data of fabric suchas tow setts, tow titers, planar density and thickness of a technical fabric. To assess the simulation, three types of wovenfabrics namely, plain, twill and satin were impregnated by epoxy resin using vacuum infusion process. The volume fractionsof the matrix and fibers of real composites were compared with simulated ones. It was demonstrated that the approach withracetrack assumption led to high degree of convergence with experimental results. The maximum relative error of pioneeredmethod to evaluate volume of the pore in this condition exceeded up to 1.43 %. Suitable correlation between volumefractions of the pore and void was observed in experimental data. It is experimentally demonstrated that the void volumefraction of composite will be increased with decrease of pore volume due to difficulty of wetting. In this paper, it is illustratedthat the resin capacity of a woven fabric is a function of vacuum level in vacuum infusion process. For instance, resincapacity of a certain plain fabric could be reduced up to 10 % under 60 kPa (0.6 bar) of vacuum in contrast with steady stateof fabric at room atmosphere.