光谱分析的微机测试

介绍了一种用光电倍增管将光信号转换为电信号,再将此信号放大经模数转换后输入到微机、打印机等设备的一套光谱分析的微机处理方法,此种方法与传统的干板照像法进行比较,在进行光谱分析时省时、省力、误差小,实现了光谱分析的微机化。     

Phase diagram of the Fe-rich portion of R-Fe-Al pseudoternary system(R=Dy_(0.65)Tb_(0.25)Pr_(0.1))

The 1000℃ isothermal section of the Fe-rich portion of R-Fe-Al(R=Dy0.65Tb0.25Pr0.1) pseudoternary system has been investigated using optical microscopy,X-ray diffraction,EPMA and DTA techniques.The 1000℃ isothermal section consists of 9 single-phase regions,14 two-phase regions and 6 three-phase regions.In the R-Fe pseudobinary system,except the R2Fe17 compound,the homogeneity regions of other compounds are shifted towards the stoichiometric rare earth-rich side.With Fe partially substituted by Al,the homogeneity region of R(Fe1-xAlx)2 is shifted back to the stoichiometric composition when x=0.15 and remains little changed with 0.15≤x≤0.30.The homogeneity regions of R(Fe1-xAlx)3 and R6(Fe1-xAlx)23 are slightly shifted to the stoichiometric rare earth-rich side with increasing Al content.A vertical section along R=33.33 atomic percentage is also investigated.It consists of 2 single-phase regions,4 two-phase regions and 2 three-phase regions.     

基于溶剂热反应快速沉积ZrO_2-基激光光学薄膜

基于丙醇锆-乙酸-乙醇混合体系的溶剂热反应（423 K,10 h）合成了稳定的ZrO2-基溶胶,采用旋转镀膜技术在K9玻璃基片上制备了ZrO2-基光学薄膜。借助动态光散射、傅里叶变换红外光谱、原子力显微镜、紫外/可见/近红外透射光谱、FilmTMTek 3000型薄膜分析仪以及强激光辐照实验对溶胶与薄膜的微观结构及光学性能进行表征。研究发现,通过与溶剂乙醇的酯化反应和与丙醇锆的配合反应,乙酸具有温和地提供反应水和降低丙醇锆水解活性的双重作用。在各工艺参数适当配置的情况下,采用该方法可以快速合成颗粒流体力学直径为10 nm~15 nm的溶胶,由此沉积的薄膜具有平整的表面、较高的折射率1.633（测试波长为632 nm）和高的激光损伤阈值34.7 J/cm2（激光波长为1 064 nm,脉冲宽度为3 ns,＂R/1＂测试模式）。     

光纤电磁场传感器中调制与解调电路的设计及实现

文［１］提出光纤电磁场传感器中的光调制与电解调技术。本文针对光纤电磁场传感器中的一些特殊问题，着重讨论光调制与电解调电路的设计原理。并将实现的电路应用于单光路检测的光纤电磁场传感器中，实验测试取得满意的结果。     

高原冻土区富水场地地基处理措施对比研究

高原冻土区地质条件复杂,冻土地基的差异性冻胀和融沉变形威胁着工程的长期稳定性和服役性能。为满足工程基础的工后沉降与沉降差要求,同时减少对下部冻土的扰动,以多年冻融区过渡段某富水场地为例,开展地基处理现场试验,对比块石抛填和块石抛填+换填两种地基处理施工方案。结果表明,针对包括淤泥质泥岩、粉砂质土、中粗砂、冻融区过渡带四种工程地质条件,采用块石抛填方案均出现翻浆、冒泥等现象,无法碾压达成地基处理要求,而采用块石抛填+换填处理方案,经8～10遍碾压后,压实度均能达到要求。     

EPON技术在智能变电站状态监测和视频监控系统中的应用

以太无源光网络（ethernet passive optical network,EPON）是一种新型的光纤接入网络技术,它具有低成本、高带宽、电磁干扰小、扩展性强、兼容性强等特点。在智能变电站中状态监测和视频监控系统数据量较大、实时性要求较低。采用EPON技术构建站内状态监测与视频监控系统,能够有效地解决出口带宽分配问题,且无需使用交换机,大大节省网络建设投资与全寿命周期维护成本,是智能变电站状态监测和视频监控系统有效的新型组网方案。分析了智能变电站状态监测和视频监控系统应用EPON技术的可行性,并提出220kV智能变电站EPON网络构建方案,为智能变电站状态监测和视频监控系统的数据传输提供了一种新型方案。     

Experimental investigation on the plasma morphology of ablative pulsed plasma thruster with tongue-shaped and flared electrodes

Ablative pulsed plasma thrusters(APPTs) are considered as an attractive propulsion option for station-keeping and drag makeup purposes for mass-and power-limited satellites. In order to understand the physical mechanism of APPTs, high-speed camera and optical emission spectroscopy are utilized to investigate the plasma characteristics including the spatial distribution and composition between the electrodes. The plume images and spectra at different times and positions are experimentally recorded, and the spatial distribution, composition, and trajectory of plasmas can be concluded through analyzing them. With the increase of the distance from the ablation surface, two clusters of plasmas near the anode and cathode meet downstream,and the species and density of plasmas tend to be uniform.     

条形药包爆破破岩规律的试验研究

分析了前人关于爆破破岩机理论述方面的矛盾，通过高速摄影观察有机玻璃中条形袋药爆炸波和破裂缝发展规律，得到了关于条形药包爆破破岩规律方面的新认识。提出了冲击该、气体膨胀压和反射拉伸波在破岩过程中各自所起的不同作用。特别在此基础上推出了条形药包下破裂深度计算公式，对工程实践有积极的指导作用。     

Structural Abnormalities of the Optic Nerve and Retina in Huntington’s Disease Pre-Clinical and Clinical Settings

Huntington’s disease (HD) is a fatal neurodegenerative disorder caused by a polyglutamine expansion in the huntingtin protein. HD-related pathological remodelling has been reported in HD mouse models and HD carriers. In this study, we studied structural abnormalities in the optic nerve by employing Spectral Domain Optical Coherence Tomography (SD-OCT) in pre-symptomatic HD carriers of Caucasian origin. Transmission Electron Microscopy (TEM) was used to investigate ultrastructural changes in the optic nerve of the well-established R6/2 mouse model at the symptomatic stage of the disease. We found that pre-symptomatic HD carriers displayed a significant reduction in the retinal nerve fibre layer (RNFL) thickness, including specific quadrants: superior, inferior and temporal, but not nasal. There were no other significant irregularities in the GCC layer, at the macula level and in the optic disc morphology. The ultrastructural analysis of the optic nerve in R6/2 mice revealed a significant thinning of the myelin sheaths, with a lamellar separation of the myelin, and a presence of myelonoid bodies. We also found a significant reduction in the thickness of myelin sheaths in peripheral nerves within the choroids area. Those ultrastructural abnormalities were also observed in HD photoreceptor cells that contained severely damaged membrane disks, with evident vacuolisation and swelling. Moreover, the outer segment of retinal layers showed a progressive disintegration. Our study explored structural changes of the optic nerve in pre- and clinical settings and opens new avenues for the potential development of biomarkers that would be of great interest in HD gene therapies.