Abstract: An apparatus for use down a bore hole to reduce the viscosity of a hydrocarbon-containing fluid in the bore hole. The apparatus includes a housing having a size for disposition in the bore hole. At least one ultrasonic transducer is carried by the housing. The ultrasonic transducer preferably has an active element changeable from a first shape to a second shape in the presence of an electromagnetic field. An electromagnetic field is provided through at least a portion of the active element to change the shape of the active element. An acoustic element is coupled to the active element for providing ultrasonic energy to the hydrocarbon-containing fluid in the bore hole. A method for reducing the viscosity of a hydrocarbon-containing fluid in a bore hole is additionally provided.

Abstract: A demolition and compaction track shoe and assembly for a crawler vehicle track includes a central opening and diagonally oriented demolition blades protruding sufficiently outwardly to be primarily useful in demolishing large rocks, home appliances, and similar materials of a type generally encountered in a land fill site. The diagonally oriented demolition blades cooperate with transversely disposed grouser blades to obtain a smoother riding, stable, self-cleaning track. The grouser blades extend only part way across the track shoe in a manner leaving a lateral spacing or gap between the adjacent ends of the grousers so as to provide a scissoring action on debris captured between adjacent grousers of adjacent track shoes in the track.

Abstract: Projection measurements are made at different parts of the X-ray energy spectrum. These measurements are processed to obtain image data with the soft tissue component eliminated. The processed image data is obtained before and after the administration of a contrast agent. The two sets of processed image data are combined to obtain an isolated image of the contrast agent which is immune to motion of soft tissue.

Abstract: A document transport and system particularly useful as a bank-proof machine employs a keyboard of a type for normal use with two hands simultaneously for recording data read from checks by the keyboard operator. A feed hopper feeds checks one at a time from the hopper to a cyclic check-transport carrier interposed between the hopper and a check-transport channel for receiving the checks and carrying the checks therealong. The surface of the carrier is disposed to receive checks thereon from the hopper at a position disposed to permit reading of the checks by the keyboard operator as the carrier moves to carry the checks to the check-transport channel. Means are provided for retaining the checks to the carrier for reading by the operator and for releasing the checks from the carrier at a position in the movement thereof so as to discharge the checks into the transport channel, and for moving the checks along the channel.