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A double-blind trial of 0.75% metronidazole gel versus oral oxytetracycline 250 mg twice daily in the treatment of rosacea was undertaken. Over a 9-week study period, both treatments were shown to be highly effective as shown by a reduction in numbers of papules and pustules, severity of erythema and overall subjective assessment by both observer and patient. Topical metronidazole gel may be regarded as an effective alternative to oral oxytetracycline in the treatment of rosacea.

The mechanism of low-frequency Borehole Coupling from the literature is here applied to a borehole of non-uniform radius. It is noted that in addition to the pressure signal in a fluid-filled borehole coincident with the passage of an external plane compressional wave, there are waves created at any change in radius which arrive later as coherent noise. This is illustrated first with a single step-change in radius. An example using the caliper log from an oil well shows that these delayed waves create a noise train of substantial amplitude relative to the direct compressional wave. It is pointed out that a down-hole pressure source will radiate a noise train due to caliper changes which will follow the direct compressional wave with exactly the same waveform as that encountered in Borehole Coupling.

The compatibility between molybdenum and several refractory compounds present as dispersed phases in the 3000-4000°F (1650–2210°C) temperature range has been evaluated. Compounds included in the study were BN, ZrN, HfN, LaB6, ZrB2, TaB2, Y2O3, MgO, ZrO2, and ThO2. Hot-pressed alloys, consisting of nominally 2.5 vol.%, of the refractory phase in a molybdenum matrix, were vacuum-annealed to determine elevated-temperature stability. The evaluation was based on changes in grain size, dispersed-phase morphology, hardness, and gross macroscopic deterioration. The materials HfN, ZrO2, and ThO2 showed promise for dispersion-strengthening and were recommended for further development.

Gamma-ray yields as a function of neutron energy for tantalum and tungsten have been generated with a combined experimental and theoretical approach. The results are presented in a format that woul...

A study was undertaken to determine the deformation behavior of polycrystalline nickel of grain sizes from 0.018 to 0.44 mm in the microstrain region. Deformation was observed to begin at stresses of about 200 psi or 0.1 of the critical resolved shear stress for single crystals. Deformation proceeded in annealed samples by three well developed stages, the nature of each of which was influenced by prior thermomechanical treatments. The micro-flow stress in the third stage obeyed a Petch type of grain size dependence; no parabolic hardening behavior was observed. A micro-Bauschinger effect was observed that may be related to the lattice resistance to free dislocation motion. (Author)