Abstract: An improved method and apparatus for powering and controlling the operation of large diesel-electric off-road haulers of the type in which hauler drive wheels are propelled and retarded by DC electric wheel motors powered from on-board generators, optionally supplemented by DC power, from external trolley lines. In the disclosed system, thyristor-type converters connected into the system AC power grid are used to receive supplemental external power from DC trolley lines and supply it into the AC power distribution grid in the propel mode. The use of such thyristor-type converters makes possible the use of supplemental trolley line power without provision of separate switching or control gear to operate the DC wheel motors when trolley line power is received.

Abstract: An improved method and apparatus for powering and controlling the operation of large diesel-electric off-road haulers of the type in which hauler drive wheels are propelled and retarded by DC electric wheel motors powered from on-board generators, optionally supplemented by DC power, from external trolley lines. In the disclosed system, thyristor-type converters connected into the system AC power grid are used to receive supplemental external power from DC trolley lines and supply it into the AC power distribution grid in the propel mode. The use of such thyristor-type converters makes possible the use of supplement trolley line power without provision of separate switching or control gear to operate the DC wheel motors when trolley line power is received.

Abstract: A cured transparent, abrasion resistant coating on at least one surface of a substrate. The coating composition comprises an effective abrasion resisting amount of a colloidal dispersion containing colloidal antimony oxide and colloidal silica in a weight ratio of less than or equal to about 30:70, in a water-alcohol solution of the partial condensate of R(Si(OH).sub.3) wherein R is an organic radical.

Abstract: A coating composition which forms an improved transparent, abrasion resistant coating upon curing. The coating composition comprises an effective abrasion resisting amount of a colloidal dispersion containing colloidal antimony oxide and colloidal silica in a weight ratio of less than or equal to about 30:70, in a water-alcohol solution of the partial condensate of R(Si(OH).sub.3) wherein R is an organic radical.

Abstract: A method and apparatus for growing liquid phase epitaxial (LPE) crystals upon only one surface of a supporting substrate. The method requiring the insertion of a gasket between a pair of substrates, upon whose exposed surfaces it is desired to grow an LPE crystal. The gasket essentially acting to contain a meniscus of entrapped flux and thereby entrap an air bubble between the substrates so as to prevent growth upon the interior surfaces of the assembly.

Abstract: A mixtureand method are disclosed for growing bismuth lutetium iron garnet crystals via liquid phase epitaxy on a gadolinium gallium garnet (GGG) substrate wherein the crystals exhibit a relatively high Faraday rotation and an improved optical absorption.

Abstract: A rinse process for solvating adhered primary melt residue from magnetic garnet crystals grown via liquid phase epitaxial (LPE) techniques. The rinse melt consists of a mixture having a saturation to nucleation temperature range that encompasses the primary melt's growth temperature and a solvent compound different from that used in the primary melt, which will solvate the solvent used in the primary melt and will not produce undesirable rinse melt adhesion.