1,408 research outputs found
Rare earth elements compositions and genesis of Xinhua large-scale phosphorite deposit in Western Guizhou, China
No full textPGE geochemistry and Re-Os dating of massive sulfide ores from the Baimazhai Cu-Ni deposit, Yunnan province, China
No full textCANONICAL ABERRATION THEORY IN ELECTROMAGNETIC MULTIPOLES
No full textIn a 2N-pole electromagnetic system, defining the electron optical Hamiltonian function, we have derived both general algebraic expressions (arbitrary N) and special numerical formulas (N = 3,4,5,6,7) for different aberrations from lower to higher order (i.e., the order of N - 1, N + 1, 2N - 3, 2N - 1, 3N - 5). The so-called canonical aberration theory in electromagnetic multipoles has thus been developed, which allows us to deduce angular dependencies of different aberrations and to examine the possibility for spherical correction of a round lens by using multipoles.Physics, AppliedSCI(E)0ARTICLE125968-59756
Hot Deformation Behaviors and Dynamic Softening Mechanisms of As-Cast XM-19 Super Austenitic Stainless Steel
No full textThe hot deformation behaviors and dynamic softening mechanisms of XM-19 super austenitic stainless steel (SASS) were investigated using the isothermal compression test in the temperature range from 1025 to 1250 °C and a compression rate of 0.01–10 s−1. A hot processing map with a strain of 0.9 was constructed, and the analysis results show that the optimal thermal deformation parameters are a temperature range of 1200–1250 °C and a strain rate range of 0.03–0.2 s−1. The thermal activation energy at 0.7 strain is calculated to be 614.3 kJ/mol by developing constitutive equations under various deformation parameters, which is essentially higher than the range of thermal deformation activation energy of typical austenitic stainless steels. At a high temperature of 1250 °C, the synergistic effect of adiabatic heating and increased dislocation density drives the recrystallization fraction to surge from 20% to 78% as the strain rate rises from 0.01 to 10 s−1, while at a fixed strain rate of 0.1 s−1, the increase in deformation temperature from 1025 °C to 1250 °C promotes dynamic recrystallization (DRX), leading to a parallel rise in recrystallization fraction to 25%. The nucleation mechanism of XM-19 SASS is primarily driven by discontinuous dynamic recrystallization (DDRX), with a supporting role of continuous dynamic recrystallization (CDRX). The contribution of CDRX decreases gradually with increasing deformation temperature
AlN/Al dual protective coatings on NdFeB by DC magnetron sputtering
No full textAlN/Al dual protective coatings were prepared on NdFeB by DC magnetron sputtering in a home-made in dustrial apparatus.Comparing with Al coating, AlN/Al coatings have a denser structure of an outmost AlN amorphous layer following an inner Al columnar crystal layer. The coatings and NdFeB substrate combine well, and more over, there is occurrence of metallurgy bonding in the interface layer. Both Al and AlN/Al coatings have a good protective ability to NdFeB. Especially, the corrosion resistance of AlN/Al coated NdFeB is improved largely.AlN/Al and Al protective coatings not only do not deteriorate the magnetic properties of NdFeB, but contribute to their slight increase.AlN/Al dual protective coatings were prepared on NdFeB by DC magnetron sputtering in a home-made in dustrial apparatus.Comparing with Al coating, AlN/Al coatings have a denser structure of an outmost AlN amorphous layer following an inner Al columnar crystal layer. The coatings and NdFeB substrate combine well, and more over, there is occurrence of metallurgy bonding in the interface layer. Both Al and AlN/Al coatings have a good protective ability to NdFeB. Especially, the corrosion resistance of AlN/Al coated NdFeB is improved largely.AlN/Al and Al protective coatings not only do not deteriorate the magnetic properties of NdFeB, but contribute to their slight increase
Tuning and Identification of Interband Transitions in Monolayer and Bilayer Molybdenum Disulfide Using Hydrostatic Pressure
No full text나노자성 연구를 위한 편광조절 연X-선 현미경시스템
No full text학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2006.2, [ x, 97 p. ]In this thesis the systemic review on soft X-ray microscopy for nanomagnetism was conducted including the reviews on the interaction between soft X-rays and matter, soft X-ray optics, the magnetic contrast mechanism XMCD, and the properties of bending magnet synchrotron radiation were reviewed. A dichromatic magnetic contrast enhancement method by using the recent development of quantitative X-ray polarization modulating technique at a full-field X-ray transmission microscopy station XM-1, at ALS was introduced, and the experimental result of the quantitative polarization modulation was summarized.한국과학기술원 : 원자력및양자공학과
A 3-D Stacked High-Q PI-Based MEMS Inductor for Wireless Power Transmission System in Bio-Implanted Applications
No full textThis paper presents high-Q factor 3-D stacked MEMS inductors on polyimide substrate for wireless power transmission systems. The 3-D double layer stacked structure was designed, fabricated, and characterized, and self-planarization of polyimide was realized. The 3-D inductor achieves an inductance of 7.189 mu H with a high-Q factor of 26.1 at 4.3 MHz. An inductively coupled wireless power transmission system was set up using the 3-D inductor in combination with a solenoid transmitting coil. At the resonant frequency of 1.6 MHz, the peak-to-peak output open circuit voltage could reach 5.2 V with a maximum power transmission efficiency of 11.74% and an output power of 35.5 mW. Effects of the load impedance and transmission distance on the output power were also investigated. Using this wireless transmission system, the driving of an implanted 3-D microelectrode array for neural prosthesis was demonstrated successfully, indicating that this 3-D stacked MEMS inductor design shows promise for applications in supplying power for implanted medical devices. [2013-0228]http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000341573300016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, Electrical & ElectronicEngineering, MechanicalSCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Stability and Spatial Chaos in 2D Hénon System
No full textThis paper is concerned with two-dimensional(2-D) discrete system of the following form xm+1,n +axm,n+1 = f (m, (1+a)xm,n,bxm−1,n), where a,m,b is a real parameters.We investigate the fixed planes, stability of the fixed planes and spatial chaos behavior for this system. A stability condition for the fixed plane is given, and it is proven analytically that for some parameter values the system has a transversal homoclinic orbit, which is a verification of this system to be chaotic in the sense of Li-Yorke. These results extend the corresponding results in the one-dimensional (1-D) H´enon system: xm+1,n0 = f (m, xm,n0,bxm−1,n0 ), where n0 is a fixed integer. These results also extend the corresponding results in the 2-D Logistic system: xm+1,n +axm,n+1 = f (m, (1+a)xm,n,)
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