Methods and devices are disclosed for generating acoustic pulses in a water or land medium, e.g., for use in seismic investigations. The pulse amplitudes, waveshapes, and frequencies can be controlled by signals that may originate at a remote location. Compressed gas is confined at high pressure in a valve chamber (12, 194). An initiating signal causes the opening of a passage (54, 56, 192) from the chamber into the medium to initiate the rise of a pressure pulse therein. A second signal causes ...

A generating means as a form of utilizing water to generate electricity. There is a water dam which backs up a sizeable depth and water pressure, and a water outlet pipe near the bottom of the dam. A plurality of electric generating stations are positioned below the dam and utilize water flow through the outlet pipe to drive an electric generator at each station.

A tool for generating a prescription surface in a plastic eyeglass lens. A pair of replaceable, cutting elements are mounted on a tool having a spindle. Each cutting element has a solid polycrystalline diamond material forming a cutting edge for progressively shaving a surface on the backside of the lens as the tool is swing back and forth. The surface so generated need only be polished, without the conventional abrasive finishing steps.

An image of objects in a three dimensional space is generated for display on a two dimensional regular pixel array by offset and span generations (OFGN, SPGN) for anti-alias filtering which causes multiple rendition of the image, with each rendition displaced by a sub-pixel offset (Nx,Ny) with respect to the previous rendition. Image primitives are rendered by a scan line algorithm using a linked active polygon list (APL) and a deleted polygon list (DPL) to enable vertical offsets to be effected...

A computer-implemented method of generating a glyph in which a plurality of design characteristics are extracted from a target font and a source glyph program is generated using the design characteristics. The source glyph program defines a new glyph that corresponds to a character that is not present in the target font, e.g., the Euro, and is stylistically similar to glyphs of the target font. The new glyph may be added to the target font, it may be rendered on an output device, or it may be sa...

Leading current or lagging current of an alternator is supplied by a simple structure including short-circuit switch elements. The short-circuit switch elements are connected across output terminals of the alternator three-phase armature windings, and are turned on and off at fixed timings to supply a suitable amount of the leading current to armature windings regardless of the rotational speed. Thus, the leading current can be supplied without phase-leading-capacitors so that the apparatus can ...

A computer-implemented method of generating a glyph in which a plurality of design characteristics are extracted from a target font and a source glyph program is generated using the design characteristics. The source glyph program defines a new glyph that corresponds to a character that is not present in the target font, e.g., the Euro, and is stylistically similar to glyph of the target font. The new glyph may be added to the target font, it may be rendered on an output device, or it may be sav...

A method of generating a mesh includes locating a reference voxel. The reference voxel is inside a surface of an object and is adjacent to at least one voxel outside the surface. The method also includes, for a voxel outside the surface adjacent to the reference voxel, determining a set of contributing voxels by finding adjacent voxels on the same surface as the reference voxel using morph operators. The method further includes forming triangles with adjacent contributing voxels and the referenc...

A corona generating apparatus for use in an electrophotographic copying machine is disclosed, which includes an elongated shield of a conductive net member defining an open ended chamber and a corona discharge electrode mounted in the chamber. The conductive net may be backed by a conventional conductive shield plate.

A foam generating and spraying apparatus adapted to receive a quantity of polymeric resin and a foaming agent therefor, and emit the foamed product thereof, comprises a resin conduit having an inlet and an outlet end; a foaming chamber having an inlet and an outlet end being disposed coaxially with respect to the resin conduit; a resin inlet upstream of the resin conduit for admitting a quantity of pressurized polymeric resin thereto; a foaming agent inlet upstream of the foaming chamber for adm...