It is experimentally demonstrated that the PBLG polymer liquid crystal is available as an electron beam recording medium. An electron beam pattern can be written directly on a PBLG L. C. layer without using a dielectric thin film as the target electrode. A relation between the spatial resolution and thickness of the liquid crystal layer is theoretically derived, and the structural change due to the electric field induced by the electron beam charge pattern and its responses are discussed from experiments. From these experiments, it is found that the spatial resolution limit is better than 401p/mm.
A dew-point hygrometer adopting a quartz crystal as the sensor, was constructed to be used as one of the standard hygrometers and as the monitor of the constant humidity generator in the National Research Laboratory of Metrology. The paper describes the principle of detection, the structure of the instrument and its principal features, and discusses the precision of the dew-point hygrometer from the points of temperature measurement, the relation among the flow rate, pressure and humidity, the influence of ambient temperature and so on. Judging from several experimental results, it is found that this hygrometer can be used as a standard instrument as first designed, though to make the uncertainty of the dewpoint hygrometer less than 0.1°C is still fairly difficult.
An apparatus was constructed for direct observation of true contact area between two rollers in rolling contact. For this attempt, a glass roller having triangular cross section was newly prepared. The actual area of contact between the glass roller and a steel roller could be observed by an internal reflection method. With this apparatus, it was observed that the minor axis of the contact ellipse decreased with increase of the speed of revolution. We believe that if quantitative calculations were to follow these results, a more accurate analysis of rolling friction could be obtained.
Carbon fibers have been prepared by thermal decomposion of hydrocarbon such as benzene at about 1100°C using fluid catalytic particles of iron, which are formed by ferrocene decomposition. The present vaporgrown carbon fibers have been obtained in the sponge-like form. This spongy deposit consists of vermicular carbon fibers with diameters 0.1_??_1.5μm and the length about 1mm. At the tip of the fibers small catalytic particles with diameter about 5 nm, encapsulated with carbon deposit, are observed. The other end of the fibers, forming a characteristic central hollow tube of vapor-grown carbon fibers, is also encapsulated by carbon deposit.