Abstract: A system for cleaning solids contaminated with solvent-soluble contaminants. The system comprises the use of at least two successive cleaning zones, each of which includes a slurry stage and a centrifuge separation stage, wherein the solids to be cleaned and the solvent used for cleaning flow in countercurrent relationship to each other between the successive zones.

Abstract: A computer-implemented technique for dip filtering of seismic data whereby seismic data of a selected attribute in space and time coordinates is displayed in accordance with a 3-D illumination model such that the apparent angle of illumination of the data relative to an apparent viewing position is optimally adjusted to achieve best differentiation and display presentation of seismic dipping events, fault indications, excessive multiple indications, and the like. The method requires a perceptual view of a seismic section as a 3-D surface from which a vector of images can be derived. Thereafter, vector of images surface components are derived and, in accordance with a pre-determined illumination model, i.e. composed as a function of azimuth and elevation relative to a display, the vector of images of the seismic data are transformed to produce enhancing a specific eye view/illumination alignment.

Abstract: A process for separating upgoing and downgoing seismic wave events in a vertical seismic profile, and particularly for vertical seismic profiles wherein the seismic energy source is offset from the borehole in which seismic detectors are located in vertical spaced array. The process operates on two detector signals at a time (as S.sub.1 and S.sub.2) and is based on the concept that waves traveling in opposite directions have spatial derivatives of opposite sign. The derivative is approximated by the difference of the two signals which is time integrated to recover the phase. The resulting integrated difference signal I is then amplitude scale corrected and combined by addition or substraction with a signal S.sub.0 representing the sum of the two detector signals to form a succession of filtered signals which, when recorded in alignment in order of detector depths to form a vertical seismic profile preserves either the upgoing or the downgoing seismic events.

Abstract: Method and apparatus for isotope separation using the combination of selective pre-excitation by light radiation with further collisional processing in a DC, rf or microwave gas discharge field to recover ionized atoms or dissociated molecules of the selected isotope. Thus, uranium atoms or molecules in gas phase are irradiated in an interaction volume with light radiation of selected wavelength to raise energy states to a relatively stable second or mid-level. At the same time a gas discharge within said interaction volume subjects raised energy atoms or molecules to a collisional process tending to raise a significant number through the energy ladder to the respective ionization continuum or dissociation light whereupon the charged atoms or molecules may be collected as an enriched bulk of selected isotopic species.

Abstract: A hydraulic vibrator having an adjustable piston rod and a fixed piston rod to vary the cylinder volume for operation at different vibration frequencies. The adjustable piston rod is in threaded engagement with the fixed piston rod and has a piston head adjacent a piston head on the fixed piston rod. Rotation of the adjustable piston rod displaces the two piston heads, thereby varying the cylinder volume of the hydraulic vibrator.

Abstract: Vibrator apparatus having adjustable cylinder volume by means of a continuously adjustable end sleeve that varies the axial limit of the cylinder. A reaction mass with an axial cylinder bore reciprocates on a double rod piston. Frist and second end sleeves define the cylinder volume and one end sleeve is threaded and axially translatable relative to the piston to vary volume while a position sensing device continually maintains centering of the piston in the cylinder.

Abstract: Method and apparatus for producing improved synthetic velocity logs from seismic traces. The seismic traces are processed to enhance high frequency content by converting each trace to a spike trace, then filtering the spike trace with a function designed to reduce side lobes and enhance high frequency content. The processed trace is then operated on by a conventional summation process to produce a synthetic velocity log. Due to the enhanced high frequency content of the processed trace, the resulting synthetic log tends to show sharp discontinuities in the geology, much like a log taken from a well.

Abstract: A method of three-component seismology wherein seismic energy induced vertical, radial and transverse particle movement is detected at plural spaced positions along a survey line to produce orthogonal data signals, and the different orthogonal data signals are variously processed both separately and interactively to develope novel signal relationships which improve indication and identification of steeply dipping reflections, out-of-plane reflections, and the like.

Abstract: An encode-decoder system for generating highly accurate, coinciding synchronizing signals at each of plural separated locations; for example, a system generating start signals for a seismic data acquisition system. The system transmits psuedo random code data over selected communication link to a respective position decoder which samples the incoming code and compares it with a standard code. If there can be established a predetermined number of successive code matches, an output start signal is enabled when the code match count first peaks and then decreases.

Abstract: 1,2-dichloroethane is produced by reacting, in a vapor phase, chlorine and ethane in the presence of a copper containing catalyst at a temperature in the range of from about 200.degree. to about 500.degree. C.