SiGe single crystals with different Ge concentrations were measured by Fourier transform infrared （FTIR） spectroscopy at room temperature （RT） and 10 K. A new peak appears at the wave number of 710 cm^-1 and the s...SiGe single crystals with different Ge concentrations were measured by Fourier transform infrared （FTIR） spectroscopy at room temperature （RT） and 10 K. A new peak appears at the wave number of 710 cm^-1 and the spectroscopy becomes clearer with an increase in Ge content. The absorption strength and wave sharp of the 710 cm^-1 peak are independent of temperature. The relation of the absorption coefficient amax, the band width of half maximum （BWHM） Wit2 of the 710 cm^-1 peak, and the Ge concentration is determined with the Ge content obtained by SEM-EDX. The conversion factor is k = 1.211 at 10 K. Therefore, the Ge content in high concentration Ge doped CZ-Si single crystals can be determined by FTIR.展开更多
A parallel numerical method is employed to solve the two dimensional Navier Stokes equations in primitive variables for incompressible flow.The computing process contains two sections.The first section uses the GE (...A parallel numerical method is employed to solve the two dimensional Navier Stokes equations in primitive variables for incompressible flow.The computing process contains two sections.The first section uses the GE (group explicit) method with high parallelism to solve the velocity equations.The second section solves the pressure equation by a successive underrelaxtion iteration method in red black order.Results are given using these methods on a parallel computer.Until recently,GE method has rarely been used to solve the Navier Stokes equations.展开更多
为解决锗(Ge)基硫系玻璃光纤损耗相对较高等问题,采用物理和化学除杂相结合的工艺,制备出了高纯Ge28Sb12Se60硫系玻璃,显著降低了红外波段C、H、O杂质吸收。应用真空高速旋转法,制备出了壁厚均匀、光学质量优异的Ge28Sb12Se58S2硫系玻...为解决锗(Ge)基硫系玻璃光纤损耗相对较高等问题,采用物理和化学除杂相结合的工艺,制备出了高纯Ge28Sb12Se60硫系玻璃,显著降低了红外波段C、H、O杂质吸收。应用真空高速旋转法,制备出了壁厚均匀、光学质量优异的Ge28Sb12Se58S2硫系玻璃皮管。采用棒管法拉制出外径50±1.5μm、具有芯包结构的Ge-Sb-Se硫系玻璃光纤,光纤弯曲半径为5 mm,红外波段吸收基线为2.2 d B/m(2.87μm和4.5μm处除外)。展开更多
基金The work is financially supported by the National Natural Science Foundation of China (No. 59772037)the NaturalScience Foundation of Hebei Province, China (No. 500016).
文摘SiGe single crystals with different Ge concentrations were measured by Fourier transform infrared （FTIR） spectroscopy at room temperature （RT） and 10 K. A new peak appears at the wave number of 710 cm^-1 and the spectroscopy becomes clearer with an increase in Ge content. The absorption strength and wave sharp of the 710 cm^-1 peak are independent of temperature. The relation of the absorption coefficient amax, the band width of half maximum （BWHM） Wit2 of the 710 cm^-1 peak, and the Ge concentration is determined with the Ge content obtained by SEM-EDX. The conversion factor is k = 1.211 at 10 K. Therefore, the Ge content in high concentration Ge doped CZ-Si single crystals can be determined by FTIR.
基金Supported by the Science and TechnologyFoundation of the Chinese Institute of E-ngineering Physics
文摘A parallel numerical method is employed to solve the two dimensional Navier Stokes equations in primitive variables for incompressible flow.The computing process contains two sections.The first section uses the GE (group explicit) method with high parallelism to solve the velocity equations.The second section solves the pressure equation by a successive underrelaxtion iteration method in red black order.Results are given using these methods on a parallel computer.Until recently,GE method has rarely been used to solve the Navier Stokes equations.
文摘为解决锗(Ge)基硫系玻璃光纤损耗相对较高等问题,采用物理和化学除杂相结合的工艺,制备出了高纯Ge28Sb12Se60硫系玻璃,显著降低了红外波段C、H、O杂质吸收。应用真空高速旋转法,制备出了壁厚均匀、光学质量优异的Ge28Sb12Se58S2硫系玻璃皮管。采用棒管法拉制出外径50±1.5μm、具有芯包结构的Ge-Sb-Se硫系玻璃光纤,光纤弯曲半径为5 mm,红外波段吸收基线为2.2 d B/m(2.87μm和4.5μm处除外)。
