From Long Infrared to Very Long Infrared Wavelength Focal Plane Arrays Made with HgCdTe n + n ?/ p Ion Implantation Technology

This paper aims at studying the feasibility of very long infrared wavelength (VLWIR) (12–18 μm) focal plane arrays using n-on-p planar ion-implanted technology. To explore and analyze the feasibility of such VLWIR detectors, a set of four Cd _x Hg_1−x Te LPE layers with an 18 μ cutoff at 50 K has been processed at Defir (LETI/LIR–Sofradir joint laboratory), using both our “standard” n-on-p process and our improved low dark current process. Several 320 × 256 arrays, 30-μm pitch, have been hybridized on standard Sofradir readout circuits and tested. Small dimension test arrays characterization is also presented. Measured photonic currents with a 20°C black body suggest an internal quantum efficiency above 50%. Typical I(V) curves and thermal evolution of the saturation current are discussed, showing that standard photodiodes remain diffusion limited at low biases for temperatures down to 30 K. Moreover, the dark current gain brought by the improved process is clearly visible for temperatures higher than 40 K. Noise measurements are also discussed showing that a very large majority of detectors appeared background limited under usual illumination and biases. In our opinion, such results demonstrate the feasibility of high-performance complex focal plane arrays in the VLWIR range at medium term.     

大窝山隧道进口围岩快速掘进施工组织与管理

结合工程概况及工程特点,从机械设备配置、劳动力组织、现场管理等方面介绍了大窝山隧道进口Ⅱ级,Ⅲ级围岩段的快速掘进施工组织与管理措施,为类似隧道的快速掘进施工组织与管理提拱了相关经验.     

引水发电系统无压隧洞中弃水堰位置的数值模拟研究

水电站引水发电系统无压隧洞中的水力过渡过程是近年来电站设计中出现的一个新课题,特别是流域梯级电站开发中经常遇到。结合工程实例应用扩散法,给出了无压隧洞水力过渡过程数值模拟的基本方程以及上下游及弃水堰等边界附加方程,模拟了弃水堰布置在不同位置下,无压隧洞内的水位变化过程。研究成果和讨论对实际工程应用具有参考意义。     

国产掘进机在龙门滩引水隧洞施工中的应用

在长隧洞的施工中，采用掘进机施工的工程越来越多，特别是国外掘进机的引进，加快了长隧洞工程的开发。而国产掘进机由于其性能和材质方面的原因，存在着一定的技术缺陷．通过国产SJ-45型掘进机在龙门滩工程的施工应用，分析和总结了SJ-45型掘进机的机械性能和存在的技术问题及处理结果，以利于国产掘进机的科研、生产和施工。     

微纳级双极晶体管的热耗散研究

对于双极性晶体管,由于自身存在的自加热现象,严重地影响着器件的特性。基于热电流方程、泊松方程及电流密度方程,在二维器件仿真环境下,进行了微纳级小尺寸npn双极性晶体管热现象的器件物理特性分析。重点研究了器件的集电极电流IC与晶格温度T的因变关系。研究结果显示,随着IC的增加,器件的晶格温度逐渐升高,VCE保持在3.0V、VBE达到最大值0.735V时,随器件晶格温度的升高VBE将减小。最后,笔者给出了描述晶体管温变关系的三维曲线。     

回顶法灌注混凝土浆成桩工艺

探讨了回顶法灌注混凝土浆的成桩工艺，分析了影响混凝土浆灌注质量的主要因素，并给出了相应的技术参数和措施。     

Corrosion fatigue short crack growth behaviour in a high strength steel

The influence of an aggressive environment (0.6 M, aerated NaCl solution) on short fatigue crack initiation and growth behaviour has been studied. The study involved three major test series, namely: air fatigue, corrosion fatigue, and intermittent air fatigue/corrosion fatigue. The above tests carried out under fully reversed torsional loading conditions at a frequency of 5 Hz, showed that it was the non-metallic inclusions which took part in crack initiation resulting from debonding at metal matrix/inclusion interface and pitting of inclusions in both air and corrosove environments, respectively. Short fatigue crack growth results in these two environments obtained by using plastic replication technique, indicated a large effect of microstructure i.e. prior austenite grain boundaries. The stage/stages at which the environmental contribution was dominant has been discussed by considering the results achieved from intermittent tests. However, the mechanisms involved in corrosion fatigue short crack growth have also been described in the light of results obtained from futher investigations carried out by conducting corrosion fatigue tests under applied cathodic potential conditions and tests on hydrogen pre-charged specimens under air fatigue and uniaxial tension conditions.     

光刻胶灰化工艺与深亚微米线条的制作

随着器件尺寸的缩小，细线条的制作成为很关键的工艺，普通光学光刻已接近其分辨率的极限，而电子束光刻和Ｘ射线光刻技术复杂、费用昂贵。本文对光刻胶灰化工艺进行了分析和研究，并应用此工艺进行了深亚微米线条的制作，在普通光学光刻机上制作出宽度小于０．２５μｍ细线条。我们已将此工艺成功地应用在深亚微米ＭＯＳＦＥＴ的制作中。     

水下灌浆隧道围岩应力与位移分析

目前对隧道围岩的应力与位移分析，其前提都是以围岩为均质材料，而灌浆隧道的围岩是由两层不同力学性能材料构成的夏合结构，其应力与位移特点不同于均质围岩。基于岩体的弹脆塑性模型及非关联流动法则，考虑地下水压力的作用，对灌浆隧道围岩的应力与位移进行理论分析，获得了围岩位移曲线。