An improved collecting apparatus for small aquatic or airborne organisms such as plankton, larval fish, insects, etc. The improvement constitutes an apertured removal container within which is retained a collecting bag, and which is secured at the apex of a conical collecting net. Such collectors are towed behind a vessel or vehicle with the open end of the conical net facing forward for trapping the aquatic or airborne organisms within the collecting bag, while allowing the water or air to pass through the apertures in the container. The container is readily removable from the collecting net whereby the collecting bag can be quickly removed and replaced for further sample collection. The collecting bag is provided with means for preventing the bag from being pulled into the container by the water or air following therethrough.

A system for analyzing constituents of coal-derived materials comprises three adsorption columns and a flow-control arrangement which permits separation of both aromatic and polar hydrocarbons by use of two eluent streams. 4 figures.

A low pressure ion source for a neutron source comprises a filament cathode and an anode ring. Approximately 150V is applied between the cathode and the anode. Other electrodes, including a heat shield, a reflector and an aperture plate with a focus electrode, are placed at intermediate potentials. Electrons from the filament drawn out by the plasma and eventually removed by the anode are contained in a magnetic field created by a magnet ring. Ions are formed by electron impact with deuterium or tritium and are extracted at the aperture in the focus electrode. The ion source will typically generate a 200 mA beam through a 1.25 cm/sup 2/ aperture for an arc current of 10A. For deuterium gas, the ion beam is over 50 percent D/sup +/ with less than 1% impurity. The current density profile across the aperture will typically be uniform to within 20%.

This invention teaches a control to be used in smelting aluminum by the electrolysis breakdown of alumina (Al/sub 2/O/sub 3/) in a molten electrolyte heated to approximately 950 to 1000/sup 0/C. The invention provides a sonic resonator and control that can accurately detect the resonant frequency of the resonator in the molten electrolyte. The resonator preferably is made with tubular side wall 1/4 of the sonic wavelength, or is a quarter wave resonator. A wave generator inputs a signal having a range of frequencies that includes the resonant frequency, so that a peak resonant output at the resonant frequency can be detected on an oscilloscope or like detector. This instantaneous resonant frequency is then checked against an accurate data base correlating the resonant frequencies of the resonator in the electrolyte at specific alumina concentrations normally experienced throughout the electrolysis cycle. The electrolysis cycle can thus be controlled and recharged at any predetermined low alumina concentration greater than where the anode effect phase of the cycle normally might begin.

A semiconductor liquid junction photocell in which the photocell is in the configuration of a light concentrator and in which the electrolytic solution both conducts current and facilitates the concentration of incident solar radiation onto the semiconductor. The photocell may be in the configuration of a non-imaging concentrator such as a compound parabolic concentrator, or an imaging concentrator such as a lens.

A thermoelectric generator using semiconductor elements for responding to a temperature gradient to produce electrical energy with all of the semiconductor elements being of the same type is disclosed. A continuous process for forming substrates on which the semiconductor elements and superstrates are deposited and a process for forming the semiconductor elements on the substrates are also disclosed. The substrates with the semiconductor elements thereon are combined with superstrates to form modules for use as thermoelectric generators.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

Quarterly report to the Technology Assessment Board, detailing progress and budgets at OTA.

A catalog of Office of Technology Assessment (OTA) documents published through 1987.

Quarterly report to the Technology Assessment Board, detailing progress and budgets at OTA.

A catalog of Office of Technology Assessment (OTA) documents published through 1985.

This paper describes the Office of Technology Assessment (OTA) and its relationship with Congress in developing technology-related policy.

A catalog of Office of Technology Assessment (OTA) documents published through 1980.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This is a quarterly report detailing the budget and progress of the Office of Technology Assessment.

This report discusses the history and function of the Office of Technology Assessment (OTA) and how, by the year of publication, the OTA had become very beneficial to Members of the U.S. Congress.

This report contains justification for the Office of Technology Assessment's (OTA) estimated FY1991 budget request.

This report contains justification for the Office of Technology Assessment's (OTA) estimated FY1990 budget request.

This report discusses the history and function of the Office of Technology Assessment (OTA) as it stood in November 1989, focusing on the benefit of the OTA's function as a practical analysis tool concerning technological issues.