Abstract: Conversion apparatus facilitating acquisition of NMR spectroscopy and/or imaging information from a desired one of a plurality of nuclear species, in a system originally capable of acquiring spectroscopy/imaging information for only a single nuclear species, uses: a first frequency converter to provide an excitation signal by heterodyning the transmitter signal of the single species system to the Larmor frequency of the desired one of the plurality of nuclear species, if that desired species is not the original single species; and a second frequency converter to heterodyne the response signal from the Larmor frequency of the desired nuclear species, if that desired species is not the original single species, to the frequency of the single species. The first and second converters are bypassed if the single original species is the desired species.

Abstract: The operating frequency of a multi-station power-line-carrier-communications system is automatically changed to avoid narrowband interference. Any one of the plurality of stations in the system can initiate a command to shift operating frequency, when the communications signal reception degrades below a predetermined criterion. An interfering signal itself can initiate a shift in operating frequency when the characteristics of the interfering signal are sufficient to deteriorate communications on an existing operating frequency.

Abstract: The starting frequency and sweep rate of a chirped frequency-shift-keyed oscillator are automatically controlled for correction of long-term drift. The substantially linear swept frequency output of the oscillator, during each of a successive multiplicity of swept frequency chirps, is counted and the count converted to an error signal utilized to control an appropriate potential in the oscillator circuit. The initial frequency is monitored, where the swept frequency range is small compared to the initial frequency, by counting the number of cyles during a chirp period in obtaining a first error signal from the total cycle count. The frequency-chirp ramp rate is monitored by counting the number of cycles during an initial portion, e.g.

Abstract: A semiconductor electronic device operates at high power levels using structured copper to reduce generation of stress between the elements of the device during thermal cycling in the course of normal operation. Structured copper strain buffers are used to attach each side of a silicon wafer to fluid cooled heat sinks to provide efficient removal of heat generated by the device and good electrical connection to the silicon wafer.

Abstract: An electromagnet on the gripper of an automatic assembly machine has a specially shaped pole piece structure with curved surfaces and flat surfaces, part of which are undercut in depth, to handle several different objects. Motor end bells and rotors in various orientations are picked up and transported during automatic assembly of small motors. There is quick release of light weight parts such as end bells.

Abstract: A charge transfer device is described which includes a plurality of charge transfer channels or shift registers, each having at least two sections operable at two different clock frequencies to provide variable non-symmetrical time delays in the channels and which may be operated with another identical charge transfer device to provide the functional equivalence of a single charge transfer device having twice as many channels and providing symmetrical time delays in the channels.

Abstract: A dichroic liquid crystal display of the parallel-nematic type is caused to have a bright background, indicative of the light-transmissive state, and dark characters, in the unactivated condition, by treatment of the display electrodes to cause boundaries of the dichroic liquid crystal material to be normally homeotropic except in those areas defining a character, in which areas a pattern of silicon oxide or other parallel alignment surfactant is deposited by masking techniques.