摘要:
A high-temperature oxide superconducting material in a single crystal form or polycrystal form comprising a phase of LnR₂Cu₃O x wherein Ln is yttrium or a rare earth metal(s), R is at least one element selected from the group of barium, calcium and strontium and x is 6.5 to 7, and having a high critical current density, and containing oriented crystal grains or crystals free of any twins, is prepared by synthesizing said material in the presence of at least one element selected from the group consisting of alkali metals and bismuth to form said material.
摘要:
A process for removing NO x and CO simultaneously is characterized in that an exhaust gas comprising NO x , CO and O 2 is contacted with a catalyst in the presence of steam and ammonia to reduce NO, into harmless N 2 and also to react CO with H 2 0 to convert them into CO 2 and H 2 over the same catalyst. The catalyst comprises titanium oxide, oxide of at least one metal selected from the group consisting of molybdenum, tungsten, vanadium, cerium, nickel, cobalt and manganese, and at least one metal selected from the group consisting of platinum, palladium, rhodium and ruthenium.
摘要:
The anode (2) and cathode (4) of a secondary battery are constructed by assembling graphite in its form. By employing the graphite as the starting material of the manufacture of the battery in this manner, the disintegration of the electrodes during the manufacture can be prevented. The battery thus manufactured exhibits battery function once it is charged and thenceforth, each time discharge and charge is repeated, the electrodes switch between the states of the graphite and graphite interlayer compounds owing to their reactions with ions and release of the ions, so that a high battery performance is achieved.