ATR-FTIR imaging of albumen photographic prints

The preservation of early 20th century, late 19th century albumen prints is of great concern to collection managers and conservators of photographic materials. Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectroscopic imaging is presented for the first time as analytical methodology for the study of albumen photographs. This paper shows the feasibility of obtaining FTIR images of samples from albumen photographs with a high spatial resolution using a Ge ATR objective coupled with an infrared microscope. The improved spatial resolution compared to FTIR images obtained by the reflection method is due to the high refractive index of the ATR crystal, which gives a high numerical aperture and hence, a higher spatial resolution. The technique reveals detailed information on the organic functional group distribution in the individual layers of embedded cross sections and is used complementary to visual microscopy and scanning electron microscopy/energy dispersed X-ray spectroscopy. The main results of the study are discussed with regard to their historical and artistic significance, and they are compared with data from historical and conservation literature.     

网络资源与光盘资源编目要点探析

探讨、分析了图书馆网络资源与光盘资源的编目要点, 包括: 著录信息源的选取、资源类型的判断、相关附注字段的著录、网络资源的856 字段(电子资源定位与检索) 和光盘资源的载体形态项字段的著录。提出 CNMARC 在电子资源编目方面还有待进一步的改进和完善, 应适当借鉴和参考西文电子资源编目的思路和方法。     

基于FF算法的数据信道算法的研究

目前的三种光交换技术中,OBS（光突发交换）因具有适中的交换粒度,较高的带宽利用率和其他很多优点,成为下一代全光网络的模式之一。OBS网络最关键的是其信道调度算法,它对网络性能的影响很大。这里主要介绍了OBS网络的信道调度算法——FF算法,并提出了基于FF算法的新的算法思想。     

对我国下一代网络技术的若干战略思考

通信网和互联网都是由传输和交换两部分组成,目前传输已经完成了由电到光的革命性的转变,但交换仍然是电的交换。根据分布式网络的设计理念,本文提出了新型的分布式波分、纤分复用光路交换的信息流量极大的下一代网络结构。它将从结构上解决网络的安全问题。     

基于光纤传感的小型风力机轴向推力测量研究

获得小型风力机轴向推力的方法通常有两种。一种是理论计算,其准确性不高,必须要进行修正;另一种是接触式的应变片传感测量,灵敏度不高,精度较低。本文提出一种非接触式光纤传感测量方法,实验表明该方法灵敏度比应变片式传感测量提高十倍以上,测量精度达到0.5%,可推广应用于转轴式的轴向推力测量。     

光纤拉曼放大器及其研究展望

阐述了光纤拉曼放大器的原理、分类,并对其研究现状、发展趋势和研究展望进行了探讨和总结。其中,采用有限元法,着重数值仿真了光纤拉曼放大器放大信号的原理过程。结果表明,基于Chraplyvy模型能够较好地模拟出受激拉曼散射作为光纤拉曼放大器原理的过程,并且其程序运行效率高于采用洛仑兹模型。通过研究综述,为光纤拉曼放大器的理论研究、实验和工程应用测试工作提供了参考。     

Fabrication method of ultra-small gradient-index fiber probe

Fabrication method and device of ultra-small gradient-index （GRIN） fiber probe were investigated in order to explore the development of ultra-small probes for optical coherence tomography （OCT） imaging. The beam- expanding effect of no-core fiber （NCF） and the focusing properties of the GRIN fiber lens were analyzed based on the model of GRIN fiber probe consisting of single-mode fiber （SMF）, NCF and GRIN fiber lens. A stereo micro- scope based system was developed to fabricate the GRIN fiber probe. A fiber fusion splicer and an ultrasonic cleaver were used to weld and cut the fiber respectively. A con- focal microscopy was used to measure the dimensions of probe components. The results show that the sizes of probe components developed are at the level of millimeter. Therefore, the proposed experimental system meets the fabrication requirements of an ultra-small self-focusing GRIN fiber probe. This shows that this fabrication device and method can be employed in the fabrication of ultra- small self-focusing GRIN fiber probe and applied in the study of miniaturized optical probes and OCT systems.     

陀螺罗经现状和发展趋势及对未来的应用展望

介绍陀螺罗经由机械陀螺向光学陀螺的发展历程,重点介绍了激光陀螺罗经和光纤陀螺罗经的性能、优点,并结合国内外光学陀螺罗经的研究现状对其进行具体阐述,然后对光纤陀螺罗经成为未来主流导航用罗经作了预测,并对光纤陀螺罗经的应用前景进行展望。     

在飞机增压舱加装光学玻璃的可行性分析

本文从光学玻璃防雾方面对飞机增压舱加装光学玻璃进行可行性研究,给出了防雾载荷的计算方法,为在飞机上正常使用高清晰度要求的光学设备提供了保证。方案设计过程和载荷计算方法适用于一般安装在飞机增压舱的玻璃的防雾设计计算。