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Variable properties thermopiezoelectric problem under fractional thermoelasticity
Yongbin Ma,Liuchan Cao,Tianhu He 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.2
The dynamic response of a finite length thermo-piezoelectric rod with variable material properties is investigated in the context of the fractional order theory of thermoelasticity. The rod is subjected to a moving heat source and fixed at both ends. The governing equations are formulated and then solved by means of Laplace transform together with its numerical inversion. The results of the non-dimensional temperature, displacement and stress in the rod are obtained and illustrated graphically. Meanwhile, the effects of the fractional order parameter, the velocity of heat source and the variable material properties on the variations of the considered variables are presented, and the results show that they significantly influence the variations of the considered variables.
Chemical Composition and Cold Flow Property of Cottonseed Oil Biodiesel Fuel
Yongbin Lai,Junfeng Shu,Xiu Chen,Yinnan Yuan,Lei Zhong,Yuqi Zhang,Menghong Yuan,Bo Wang,Pen Wang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.2
The Cottonseed oil methyl ester (COME) was prepared using an alkali - catalyzed trans esterification reaction, and its chemical composition and cold flow properties (CFP) were studied. Two approaches, viz. blending with petrodiesel and treating with cold flow improver (CFI) were used to improve the CFP of COME. The results showed that COME was mainly composed of fatty acid methyl esters (FAMEs): C14:0–C22:0, C16:1–C20:1, C18:2 and C18:3–C20:3. The mass fractions of saturated and unsaturated FAMEs were 27.69% and 71.65%, respectively. The cold filter plugging point (CFPP) and kinematic viscosity (KV) at 40 °C of COME are -1 °C and 4.63 mm2/s respectively. Blending with -10 petrodiesel (-10PD) and 0 petrodiesel (0PD) can decrease the CFPP of COME/-10PD (B30-B40) and COME/0PD (B40-B50) -12 and -8 °C respectively. With the increase in petrodiesel content, the KV at 40 °C of blending oil decreased, and viscosity-temperature characteristics of blending oil were improved. When used Flow Fit (≤3vol.%), the CFPPs were reduce from COME/- 10PD B5, B7, B10, B20, B50 and COME -8, -8, -9, -11, -11 and -1 °C to -28, -27, -26, -25, -16 and -5 °C respectively; COME/0PD -3, -3, -4, -5, -8 and -1 °C to - 26, -25, -24, -24, -16 and -5 °C respectively.
A Novel Synchronization Technique for High Frequency Rectifier in Wireless Power Transfer
Yongbin Jiang,Min Wu,Zexian Zeng,Yonghui Liu,Xiufang Hu,Laili Wang,Yue Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a novel synchronization technique for high frequency rectifier in wireless power transfer (WPT). To overcome the drawbacks of traditional phase-locked method based on DSP controller in high frequency rectifier, a novel phase-locked loop combined with the chained trigger mode (PLL-CTM) is proposed. The reasons why the driver pulses lose have been disclosed in detail. Then, the problem of pulse losing can be solved based on PLL-CTM. Finally, a 500W WPT prototype is built to verify the validity of the proposed synchronization technique.
Design optimization using support vector regression
Yongbin Lee,Sangyup Oh,최동훈 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.2
Polynomial regression (PR) and kriging are standard meta-model techniques used for approximate optimization (AO). Support vector regression (SVR) is a new meta-model technique with higher accuracy and a lower standard deviation than existing techniques. In this paper, we propose a sequential approximate optimization (SAO) method using SVR. Inherited latin hypercube design (ILHD) is used as the design of experiment (DOE), and the trust region algorithm is used as the model management technique, both adopted to increase efficiency in problem solving. We demonstrate the superior accuracy and efficiency of the proposed method by solving three mathematical problems and two engineering design problems. We also compare the proposed method with other meta-models such as kriging, radial basis function (RBF), and polynomial regression.
Spectral and structural analysis of large Stokes shift fluorescent protein dKeima570
Yongbin Xu,황광연,남기현 한국미생물학회 2018 The journal of microbiology Vol.56 No.11
The Keima family comprises large Stokes shifts fluorescent proteins, which are useful for dual-color fluorescence crosscorrelation spectroscopy and multicolor imaging. dKeima570 belongs to the Keima family. It has a unique chromophore sequence composed of CYG with an emission peak at 570 nm, but its molecular properties are unclear. We report the spectral analysis of dKeima570 and its crystal structure at 2.0 Å resolution. The dKeima570 chromophore is mainly in the protonation state in the entire pH range. The pH-induced non-fluorescence state was observed below pH 4.0. The crystal structure of the dKeima570 chromophore has a cis conformation at pH 6.5. The chromophore is surrounded by a unique hydrogen bonding network containing a water bridge between Glu212 and Arg194. The analysis of the dimeric interface of dKeima570 revealed the key residues that maintain the oligomerization of Keima family. Structural comparisons of dKeima570 and mKeima provided insights into the unique large Stokes shifts characteristics of the Keima family.