We developed a process for Multilayered waveguide holographic memory media. By UV embossing, 100 layer structure was fabricated, and output images could be observed without crosstalk. This process is suitable for mass production at low cost. This memory system can be applied for high density, removable memory.
Superconducting polycrystalline BaPb1-x
Bi
x
O3 thin film is attempted in the switching of microwave energy of 2.8 GHz. The film is installed in a TE111 mode cylindrical cavity made of copper and immersed in liquid helium. Transition from super- to normal-conducting states is made by a pulse current through the film of the order of 108 A/m2. The microwave energy stored in the cavity is extracted in the short time of 60 ns. The observed output powers are compared with numerical analysis and the possibility of improving the switching characteristics is discussed.
A superconducting polycrystalline BaPb1−xBixO3 thin film of 300 nm thickness is studied as a quick microwave switch. The film is installed in a cylindrical TE111-mode cavity made of copper with a resonant frequency of 2.84 GHz; the cavity is evacuated and immersed in liquid helium. Transition from the super- to normal conducting state of the film is made by a pulse current through the film with a current density of the order of 3×107 A/m2. The microwave pulse power, which is 1.2 times the cw input to the cavity, is extracted in a short time of less than 200 ns. The time response of the film switch is less than 30 ns, which is the limit of our measuring system. The observed output powers are compared with numerical analyses, and the possibilities for improving the pulse power gain are discussed.
Catalytic dehydrogenation of ethylcyclohexane, thermal hydrogenolysis of ethylbenzene and ethylcyclohexane, and the combination process comprising successive operations of dehydrogenation and hydrogenolysis for ethylcyclohexane, kerosene and gas oil have been studied using a conventional flow apparatus. Dehydrogenation has been carried out over a commercial Main products in the dehydrogenation of ethylcyclohexane are hydrogen, ethylbenzene, xylenes, benzene, and toluene. Those in the hydrogenolysis of ethylbenzene are benzene, toluene, and styrene. The hydrogenolysis of ethylcyclohexane results in a production of gases containing an appreciable amount of ethylene. Product distributions in the combination process for ethylcyclohexane are compatible with those found in the separate studies of the individual component reactions. Thus liquids produced are very high in aromatic content, while gases are rich in olefin content. The combination process has been further examined for kerosene and gas oil. It has been found that the liquids obtained from these higher hydrocarbons consisted of benzene, naphthalene and their alkyl derivatives but neither paraffins nor olefins whose boiling points are higher than that of benzene were present. Sufficiently pure components of aromatic hydrocarbons are obtainable from the liquid products by a conventional distillation. An additional advantage in the combination process is the production of gases of high ethylene content. A model plant of the combination process is presented for the separation of benzene, toluene and xylenes.
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