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Shakedown analysis of trusses under cyclic thermal load with temperature-dependent yield stress
S.Y. Leu,Y.H. Chen,K.C. Liao 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.6
The paper aims to revisit shakedown analysis involving temperature-dependent yield stress. Formulations and numerical implementations are focused on truss structures subjected to cyclic thermal and constant mechanical loads. In particular, a systematic approach based on the duality relationship of l∞-norm and l1-norm is established to state the dual formulations for static and kinematic shakedown analysis of truss structures. Illustrative examples are involved statically indeterminate three-bar and five-bar trusses, respectively. Numerical effort is made to acquire shakedown limit temperature by using the linprog function provided by MATLAB. Furthermore, the finite-element analysis using ABAQUS is also performed for rigorous comparisons.
Fuzzy PI-type current controllers for permanent magnet synchronous motors
Jung, J-W,Choi, Y-S,Leu, V Q,Choi, H H IET 2011 IET electric power applications Vol.5 No.1
<P>This study proposes a robust fuzzy PI-type current controller for a permanent magnet synchronous motor (PMSM). The proposed current control law consists of two control terms: a decoupling control term and a fuzzy PI control term. The decoupling controller accounts for the non-linearity of a PMSM model, and the fuzzy PI controller stabilises the decoupled dynamics. Based on Kharitonov's theorem, the stability condition, which can guarantee the asymptotic stability of the closed-loop system, is derived. Simulation and experimental results are presented to demonstrate the feasibility of the proposed control scheme using a prototype 1 HP PMSM servo system.</P>
Characteristics of Twin-Fluid Micro-Atomizer with Internal Mixing Mechanisms
( Muh Rong Wang ),( K. H. Yang ),( J. S. Chiu ),( Deng Sang Lai ),( T. S. Leu ),( Sheng Chih Shen ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
The twin-fluid atomizer has three micro channels fabricated via MEMS bulk micro-machining processes, one for the liquid supply and two for introducing the atomization gas. The effects of the length scale of the micro-channels on the atomization performance are investigated. The orifice hydraulic diameter (dH) of the micro atomizer is 45μm. Malvern Insitec RT-Sizer is used to measure the particle size. Results show that the twin-fluid micro-atomizer with internal mixing mechanisms can produce fine spray with Sauter Mean Diameter of 5μm under the gas pressure of 5kg/cm2 and liquid flow rate of 0.1ml/min, a performance better than the micro atomizers reported in the literature. Flow visualization through a microscope shows that the micro-spray is unstable when the two impinging gas flows are staggered inside the atomizer. The micro-spray began to twist by these two impinging gas flows when the gas pressure goes up to 2 kg/cm2. The twisting angle and the cone angle of the spray remain constant when the gas pressure is more than 3 kg/cm2. Significant decrease in the particle size takes place when the gas pressure is more than 4kg/cm2. The atomization efficiency of the twin-fluid micro-atomizer with internal mixing mechanism is several times higher than other type of twin-fluid atomizers.
Nanowire active-matrix circuitry for low-voltage macroscale artificial skin
Takei, Kuniharu,Takahashi, Toshitake,Ho, Johnny C.,Ko, Hyunhyub,Gillies, Andrew G.,Leu, Paul W.,Fearing, Ronald S.,Javey, Ali Nature Publishing Group, a division of Macmillan P 2010 NATURE MATERIALS Vol.9 No.10
Large-scale integration of high-performance electronic components on mechanically flexible substrates may enable new applications in electronics, sensing and energy. Over the past several years, tremendous progress in the printing and transfer of single-crystalline, inorganic micro- and nanostructures on plastic substrates has been achieved through various process schemes. For instance, contact printing of parallel arrays of semiconductor nanowires (NWs) has been explored as a versatile route to enable fabrication of high-performance, bendable transistors and sensors. However, truly macroscale integration of ordered NW circuitry has not yet been demonstrated, with the largest-scale active systems being of the order of 1??cm<SUP>2</SUP> (refs?11,15). This limitation is in part due to assembly- and processing-related obstacles, although larger-scale integration has been demonstrated for randomly oriented NWs (ref.?16). Driven by this challenge, here we demonstrate macroscale (7?7??cm<SUP>2</SUP>) integration of parallel NW arrays as the active-matrix backplane of a flexible pressure-sensor array (18?19?pixels). The integrated sensor array effectively functions as an artificial electronic skin, capable of monitoring applied pressure profiles with high spatial resolution. The active-matrix circuitry operates at a low operating voltage of less than 5??V and exhibits superb mechanical robustness and reliability, without performance degradation on bending to small radii of curvature (2.5??mm) for over 2,000 bending cycles. This work presents the largest integration of ordered NW-array active components, and demonstrates a model platform for future integration of nanomaterials for practical applications.
Novel transport materials for high-performance fluorescent and phosphorescent OLEDs
Bohm, E.,Anemian, R.,Busing, A.,Fortte, R.,Heil, H.,Kaiser, J.,Krober, J.,Leu, S.,Mujica-Fernaud, T.,Parham, A.,Pflumm, C.,Voges, F. The Korean Infomation Display Society 2011 Journal of information display Vol.12 No.3
To improve the performance of blue fluorescent and green phosphorescent organic light-emitting diode devices, Merck developed novel green phosphorescent host and electron-transporting materials. The newly developed electron-transporting material improves the external quantum efficiency of blue fluorescent devices up to 8.7%, with an excellent lifetime. In combination with the newly developed host materials, the efficiency of green phosphorescent devices can be improved by a factor of 1.7, and the lifetime by a factor of 7.
Novel transport materials for high-performance fluorescent and phosphorescent OLEDs
E. Böhm,R. Anemian,A. Büsing,R. Fortte,H. Heil,J. Kaiser,J. Kröber,S. Leu,T. Mujica-Fernaud,A. Parham,C. Pflumm,F. Voges 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.3
To improve the performance of blue fluorescent and green phosphorescent organic light-emitting diode devices, Merck developed novel green phosphorescent host and electron-transporting materials. The newly developed electron-transporting material improves the external quantum efficiency of blue fluorescent devices up to 8.7%, with an excellent lifetime. In combination with the newly developed host materials, the efficiency of green phosphorescent devices can be improved by a factor of 1.7, and the lifetime by a factor of 7.