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Gao, Z.W.,Zhou, Y.H.,Lee, K.Y. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.15
The interaction of two collinear cracks is obtained for a type-II superconducting under electromagnetic force. Fracture analysis is performed by means of finite element method and the magnetic behavior of superconductor is described by the critical-state Bean model. The stress intensity factors at the crack tips can be obtained and discussed for decreasing field after zero-field cooling. It is revealed that the stress intensity factor decreases as applied field increases. The crack-tip stress intensity factors decrease when the distance between the two collinear cracks increases and the superconductors with smaller crack has more remarkable shielding effect than those with larger cracks.
Gao, Z.,Deng, H.,Xue, N.,Jeong, J.H.,Yu, R. Elsevier Advanced Technology 2018 OPTICS AND LASER TECHNOLOGY Vol.98 No.-
<P>Eu2+-doped borate fluoride Ba(2)GaB(4)O(9)C1 was synthesized by the conventional high-temperature solidstate reaction. The crystal structure and luminescence properties of the phosphors, as well as their thermal luminescence quenching capabilities and CIE chromaticity coordinates were systematically investigated. Under the excitation at 340 nm, the phosphor exhibited an asymmetric broad-band blue emission with a peak at 445 nm, which is ascribed to the 4f-5d transition of Eu2+. It was further proved that energy transfer among the nearest neighbor ions is the major mechanism for concentration quenching of Eu2+ in Ba-2,GaB(4)O(9)C1:xEu(2+) phosphors. The luminescence quenching temperature is 432 K. The CIE color coordinates are very close to those of BaMgA110017:Eu2+ (BAM). All the properties indicated that the blue emitting Ba(2)GaB(4)O(9)C1:Eu2+ phosphor has potential application in white LEDs. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Gao, Z.W.,Zhou, Y.H.,Lee, K.Y. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.22
YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>y</SUB> is an orthotropic material with different material properties in a, b and c directions, such as Young's modulus, coefficient of thermal expansion (CTE), and thermal conductivity. It is assumed that the material properties of inhomogeneous high temperature superconductor (HTS) vary with different height coordinate and temperature. A model is presented in this paper to calculate the thermal stress of inhomogeneous HTS when temperature decreases from ambient to operating conditions (cryogenic temperatures). By fitting a second order polynomial to the experimental data, value of the material properties of inhomogeneous HTS can be obtained. Then, through the proposed graded finite element method, the coupled thermo-mechanical equations were solved numerically. The numerical results show that the temperature profiles distribute the function of time after soaking. It is notable that the temperature profile reaches steady in a very short period of time, so the thermal stress suddenly increases to a very high level for a bulk superconductor. It is also shown that the closer to the sample internal region it is, the larger the heat fluxes are. Besides, the maximum tensile stresses, i.e. the peeling stresses, occur near bottom corner of inhomogeneous HTS. It is intended that the model presented in this paper could be useful to researchers who are interested in mechanical properties of inhomogeneous HTS.
THE EFFECTS OF EGR AND SPLIT FUEL INJECTION ON DIESEL ENGINE EMISSION
Gao, Z.,Schreiber, W. The Korean Society of Automotive Engineers 2001 International journal of automotive technology Vol.2 No.4
An important goal in diesel engine research is the development of a means to reduce the emission of oxides of nitrogen ($NO_x$) and soot particulate. A phenomenological model based on the multizone concept is used in the current paper to analyze and compare the effects of exhaust gas recirculation (EGR) and split fuel injection on emission from a compression-ignited, direct-injection engine. The present results show that $NO_x$ can be reduced with a minimum penalty of soot particle emission with cooled EGR. Compared with EGR, split fuel injection has a higher soot penalty at a given level of $NO_x$ reduction.
THE EFFECTS OF EGR AND SPLIT FUEL INJECTION ON DIESEL ENGINE EMISSION
Z. GAO,W. SCHREIBER 한국자동차공학회 2001 International journal of automotive technology Vol.2 No.4
An important goal in diesel engine research is the development of a means to reduce the emission of oxides of nitrogen (NO_x) and soot particulate. A phenomenological model based on the multizone concept is used in the current paper to analyze and compare the effects of exhaust gas recirculation (EGR) and split fuel injection on emission from a compression-ignited, direct-injection engine. The present results show that NO_x can be reduced with a minimum penalty of soot particle emission with cooled EGR. Compared with EGR, split fuel injection has a higher soot penalty at a given level of NO_x reduction.<br/>
432-μm Laser’s Beam-waist Measurement for the Polarimeter/Interferometer on the EAST Tokamak
Z. X. Wang,H. Q. Liu,Y. X. Jie,M. Q. Wu,T. Lan,X. Zhu,Z. Y. Zou,Y. Yang,X. C. Wei,L. Zeng,G. S. Li,X. Gao 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A far-infrared (FIR) polarimeter/interferometer (PI) system is under development for measurementsof the current-density and the electron-density profiles in the EAST tokamak. The systemwill utilize three identical 432-μm CHCOOH lasers pumped by a CO2 laser. Measurements of thelaser beam’s waist size and position are basic works. This paper will introduce three methods witha beam profiler and several focusing optical elements. The beam profiler can be used to show thespatial energy distribution of the laser beam. The active area of the profiler is 12.4 × 12.4 mm2. Some focusing optical elements are needed to focus the beam in order for the beam profiler toreceive the entire laser beam. Two principles and three methods are used in the measurement. Thefirst and the third methods are based on the same principle, and the second method adopts an otherprinciple. Due to the fast and convenient measurement, although the first method is a special formof the third and it can only give the size of beam waist, it is essential to the development of theexperiment and it can provide guidance for the choices of the sizes of the optical elements in the nextstep. A concave mirror, a high-density polyethylene (HDPE) lens and a polymethylpentene (TPX)lens are each used in the measurement process. The results of these methods are close enough forthe design of PI system’s optical path.