胶片乳剂微晶体颗粒的XRD测定

胶片乳剂微晶体颗粒的ＸＲＤ测定解韫青，连业良（青岛建工学院分析检测中心，２６６０３３）测定胶片乳剂中微晶体颗粒形状及其相对含量，对研究染料在乳剂微晶体上的表面吸附作用和研究乳剂的感光性能都是极其重要的。Ａｋｉｒａ和Ｗｅｉｄｅｌｉｃ［１～２］应用Ｘ射线...     

Hypersonic boundary-layer transition on a flared cone

Transition on a flared cone with zero angle of attack was studied in our newly established Mach 6 quiet wind tunnel (M6QT) via wall pressure measurement and flow visualization. High-frequency pressure transducers were used to measure the second-mode waves’ amplitudes and frequencies. Using pulsed schlieren diagnostic and Rayleigh scattering technique, we got a clear evolution of the second-mode disturbances. The second-mode waves exist for a long distance, which means that the second-mode waves grow linearly in a large region. Strong Mach waves are radiated from the edge of the boundary layer. With further development, the second-mode waves reach their maximum magnitude and harmonics of the second-mode instability appear. Then the disturbances grow nonlinearly. The second modes become weak and merge with each other. Finally, the nonlinear interaction of disturbance leads to a relatively quiet zone, which further breaks down, resulting in the transition of the boundary layer. Our results show that transition is determined by the second mode. The quiet zone before the final breakdown is observed in flow visualization for the first time. Eventual transition requires the presence of a quiet zone generated by nonlinear interactions.     

航空胶片的X射线标定

利用光谱扩展的荧光型软X射线单色光源产生的多条谱线,通过时间递增和光强递增的方法首次标定了国产高速航空胶片在软X射线和超软X射线波段的响应特性,给出了这种胶片的响应特性曲线即光学密度与曝光量的关系和相对光谱灵敏度曲线.     

UFsh–O 软X光胶片在质子荧光源上的绝对刻度

 介绍在K –400质子加速器上，以质子激发低Z材料产生的内壳层荧光（波长0.50 ~ 6.8nm）作为光源绝对刻度UFsh –O软X光胶片。给出了该种胶片的三维黑密度曲线并对结果作了讨论。     

乳胶片感光特性的研究

乳胶片感光特性的研究刘乐书，魏华英（电子科技大学应用物理系成都６１００５４）１．前言在摄影技术高速发展的今天，彩色摄影已经普及，ＣＣＤ电子成像也日趋成熟，但黑白摄影以其独特的艺术魅力，仍在摄影艺术的舞台上占有一席之地，黑白摄影以不同层次的灰影调来抽象...     

实验室低成本红外滤波器的制作

本文介绍的一种简便的红外滤波器的制作方法,具有成本低、制作方法筒单的特点,实用性很强。     

用胶片输出仪制作光栅的实验研究

本文阐述了用胶片输出仪制作光栅的方法和实验过程,并给出了实验结果。     

快中子照相胶片成像法的初步实验

利用9Be(d,n)反应在北京大学4.5MV静电加速器上产生小于7MeV能区的快中子,采用胶片法进行了快中子照相的初步实验.对快中子胶片成像法的基本性能进行了初步的测试和研究.用国产的原材料研制了一种适用于快中子照相的关键部件－快中子转换屏.实验结果表明研制的快中子转换屏能够满足快中子照相的需要.A preliminary experiment is conducted with direct film method under the condition that fast neutron is generated by the reaction of 9Be (d,n) on the Peking University 4.5 MV Van de Graff, whose energy is lower than 7 MeV.Basic characteristics of direct-film neutron radiography system is researched with the help of samples in different materials, different thickness and holes of different diameter. The fast neutron converter, which is vital for fast neutron imaging, is produced with the materials made in china. The result indicates that fast neutron converter can meet the requirment of fast neutron imaging; what's more, further research of fast neutron imaging can be conducted on the accelerator and neutron-generator in China.     

测绘胶片感光特性曲线的新方法

用照度计代替黑度计测绘胶片感光特性曲线，在实验教学中取得良好效果．