Reflective optics with wide field of view has been applied more and more widely in EUVL or space optics, and also plays an important role in promoting scientific and technological research. Among the reflective optics...Reflective optics with wide field of view has been applied more and more widely in EUVL or space optics, and also plays an important role in promoting scientific and technological research. Among the reflective optics, the off-axis reflective optics is the most hopeful solution to the ever-highest demands of these applications. This paper gives the requirements of both the above mentioned applications and the similarities and differences between these two kinds of optical systems. Finally, a design example of off-axis reflective optics with wide field of view is presented and described.展开更多
为了获得高性能单晶金刚石探测器,综述了一种制备高质量单晶金刚石的方法。在制备过程中,尝试使用了Lift-off剥离技术,使衬底可重复利用,大大降低了金刚石材料的成本。研究表明,通过该方法制备的金刚石材料质量优于商用"电子器件级...为了获得高性能单晶金刚石探测器,综述了一种制备高质量单晶金刚石的方法。在制备过程中,尝试使用了Lift-off剥离技术,使衬底可重复利用,大大降低了金刚石材料的成本。研究表明,通过该方法制备的金刚石材料质量优于商用"电子器件级"金刚石;利用该类材料制作的金刚石探测器性能优异:对14 Me V中子和5.486 Me Vα粒子的能量分辨率分别达到1.5%和0.3%,电荷收集效率接近100%。展开更多
This study presents an integrated method suitable for off-axis tension and compression testing in unidirectional composites,and its application to the testing of in-plane shear characterization.A new rotating-grip tes...This study presents an integrated method suitable for off-axis tension and compression testing in unidirectional composites,and its application to the testing of in-plane shear characterization.A new rotating-grip test fixture,incorporating the attractive features of the existing pinned-end fixture and hydraulic wedge grips,has been developed.The proposed gripping system consists of two sets of jaw faces,each with a pair of self-aligning bearings that allows for loading in the axial and radial directions.Finite element analysis and experiments were performed to evaluate the effectiveness of the rotating-grip test fixture.Results from numerical calculations show that this method reduces stress concentrations near the end and produces relatively uniform stress distributions in the specimen gage section.Mechanical testing results show a considerable increase in the measured shear properties of composites,compared with the existing end grip systems.The results indicated that the new test fixture is significantly better than the conventional fixture,and is also comparable to the method of the oblique end-tab for off-axis testing.展开更多
文摘Reflective optics with wide field of view has been applied more and more widely in EUVL or space optics, and also plays an important role in promoting scientific and technological research. Among the reflective optics, the off-axis reflective optics is the most hopeful solution to the ever-highest demands of these applications. This paper gives the requirements of both the above mentioned applications and the similarities and differences between these two kinds of optical systems. Finally, a design example of off-axis reflective optics with wide field of view is presented and described.
文摘为了获得高性能单晶金刚石探测器,综述了一种制备高质量单晶金刚石的方法。在制备过程中,尝试使用了Lift-off剥离技术,使衬底可重复利用,大大降低了金刚石材料的成本。研究表明,通过该方法制备的金刚石材料质量优于商用"电子器件级"金刚石;利用该类材料制作的金刚石探测器性能优异:对14 Me V中子和5.486 Me Vα粒子的能量分辨率分别达到1.5%和0.3%,电荷收集效率接近100%。
文摘This study presents an integrated method suitable for off-axis tension and compression testing in unidirectional composites,and its application to the testing of in-plane shear characterization.A new rotating-grip test fixture,incorporating the attractive features of the existing pinned-end fixture and hydraulic wedge grips,has been developed.The proposed gripping system consists of two sets of jaw faces,each with a pair of self-aligning bearings that allows for loading in the axial and radial directions.Finite element analysis and experiments were performed to evaluate the effectiveness of the rotating-grip test fixture.Results from numerical calculations show that this method reduces stress concentrations near the end and produces relatively uniform stress distributions in the specimen gage section.Mechanical testing results show a considerable increase in the measured shear properties of composites,compared with the existing end grip systems.The results indicated that the new test fixture is significantly better than the conventional fixture,and is also comparable to the method of the oblique end-tab for off-axis testing.
