Meyer Waxman

A pressure-retaining deep ocean sampler and transfer system for measurement of microbial activity in the deep sea.

A deep ocean sampler (DOS) has been developed for microbiological sampling and is capable of aseptically collecting 400-ml water samples from any depth in the world oceans. The instrument maintains samples under in situ pressure and temperature. A hyperbaric transfer system has also been developed, enabling transfer of sample volumes up to 150 ml, without decompression or dilution, to pressurized incubation chambers. Utilization of14C-glutamate (21 to 96μg/l) and14C-acetate (4.6μg/l) by microbial populations in undecompressed water samples from the N.W. Atlantic and the Cape and Angola Basins was recorded over incubation periods of 2 to 18 weeks. Rates of substrate utilization ranged from 1 to 38×10−2μg/l/day.

Automated pressure regulator

A pressure regulator has been constructed that automatically nulls a sensitive differential pressure indicator of the type used in high‐quality PVT experiments, thus permitting at least partial automation of such experiments. Distinguishing features are: high resolution, sufficient rigidity for operation in a pressure range up to 100 MPa, and a control logic that permits nulling of the pressuretransducer, even if the initial state is very far from balance.

Proposed Experiment to Determine the Effect of Pressure on the emf of Thermocouples

A new experimental procedure to determine the effect of pressure on the emf‐vs‐temperature behavior of thermocouples has been conceived and tested with simulated data on a computer. An important advantage of this procedure is that the temperature of the hot junction can be accurately evaluated without the necessity of measuring it directly. Instead, the emf of the pressurized thermocouple is expressed parametrically as an appropriate function of several variables: (i) a measurable property related to the hot‐junction temperature, such as the electric power to the pressurized furnance; (ii) the cold‐junction temperature; and (iii) a reference temperature, such as 100°C, at which the pressure effect is known. By variation of the experimental conditions, a set of overdetermined equations is obtained from which the parameters can be evaluated, and thus the emf‐vs‐temperature relationship of the pressurized thermocouple can be determined. Our experience with simulated data indicates that for the temperature ra...

Compressibility factor and the second virial coefficient of boron trifluoride from 0 to 225 °C and for pressures up to 250 bar

The isothermal compressibility factor of boron trifluoride has been determined from a regression analysis of Burnett PVT measurements to an accuracy of 0.1% at 13 temperatures from 0 to 225°C and for pressures up to 250 bar. The analysis has also yielded the second virial coefficient for each temperature. A correction for the presence of sorption has been included in the data reduction.

Thermophysical properties of working fluids for binary geothermal cycles. Final report

The following are presented: thermodynamic properties of isobutane and isobutane-isopentane mixtures; a scaled fundamental equation for mixtures of isobutane and isopentane near gas-liquid critical line; and viscosities of hydrocarbons and their mixtures. (MHR)