Showing papers in "CTIT technical reports series in 1978"

Biology of larval and metamorphosing sea lampreys, petromyzon marinus, of the 1960 year class in the big garlic river, michigan, part ii, 1966-72

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Chemosterilization of the sea lamprey (Petromyzon marinus)

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Chambers for the electrodynamic containment of charged aerosol particles

Abstract: : Chambers capable of the electrodynamic containment of electrostatically-charged 20- to 100-micron-diameter particles have been constructed, along with (a) a device for introducing a preselected particle into the chamber and (b) a system for measuring the charge, size, and motion of the particle. One of the chambers contains two hemispheres and a central ring; in the other, the two electrodes are hyperboloidal. The latter chamber incorporates additional provisions for the precise control of the temperature and composition of the gas in the chamber. Measurements of the particle motion agree with theoretical calculations. (Author)

Modular Digital Missile Guidance.

Abstract: : A set of macromodular microcomputer specifications has been prepared to meet a wide range of missile guidance and control requirements. These specifications define the function performance and interface requirements of each microcomputer module i.e. microprocessor, memory and input-output I/O interface for analog and serial digital I/O, such that device technology improvements can continually be accommodated within the bounds of module function performance and interface requirements. To ensure such flexibility in design, other alternative device technologies were reviewed and evaluated for the MIL-STD-4553A serial digital I/O interface and the spectrum analyzer module, viz: fiber-optic data link and charge-coupled device, (CCD), very-large-scale integration (VLSI) analyzer options. In addition the requirements for universal microcomputer development systems were explored in order to support both medium-speed single-chip microprocessors and high-speed bit-slice emulators to preserve software commonality. Lastly, the compatibility of the Navy AN/UYK-30 microprocessor with the macromodular microcomputer family was investigated on the basis of throughput and electrical interface. In summary, this phase of the program has culminated in the generation of a practical set of microcomputer module specifications for multi-source procurement. (Author)

Materials Research for advanced inertial instrumentation. Task 3: Rare earth magnetic material technology as related to gyro torquers and motors

Abstract: : For inertial applications aligned SmCo5 magnets with high flux stability, close-to-zero reversible temperature coefficient of magnetization, and a thermal expansion similar to that of beryllium are required High flux stability is being attempted by producing high H(cu) (high resistance to demagnetization) and high H(k) (high second quadrant loop squareness) magnets through the attainment of fine grain size, low oxygen content and high density in the material Low reversible temperature coefficient will be achieved by suitable samarium replacement with a heavier rare earth element while the thermal expansion coefficient will be tailored (to that of beryllium) by controlling the alignment of the crystals in the magnet In line with these requirements a magnet sintering facility capable of ultra-high vacuum operation has been fabricated for oxygen-free processing of these magnets Techniques for producing powder with low oxygen contamination (from the environment) have also been developed for this purpose The total amount of oxygen incorporated into the powder is found to be considerably less than what is obtained with conventional procedures This has resulted in remarkably high values of H(ci) and H(k) in sintered SmCo5 magnets produced so far AN unprecedented value of 29 kOe has been measured for H(k) in a few of the magnets as compared to 5 to 10 kOe found tin most commercial magnets The energy product values of these magnets have been limited to about 13 mGOe because of poor alignment Pressure sintering (hot isostatic pressing) techniques have also been used for densification of powder compacts

Albumin polymorphism in the feral donkey of Death Valley National Monument, California

Abstract: Summary Evidence is presented for the occurrence of a second allele in the albumin system of the donkey (Equus asinus). Samples were collected from 127 feral donkeys in four locations within the Panamint Mountains of Death Valley National Monument, California. A common phenotype, electrophoretically characterized by a single band, was recorded from all four locations. A rare, double-band phenotype was recorded from two locations.