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At least 379 records · Page 21

All sources NASA NTRS DOE OSTI

NASA NTRS1975

Portable oxygen subsystem

The concept and design of a portable oxygen device for use in the space shuttle orbiter is presented. Hardware fabrication and acceptance tests (i.e., breadboard models) are outlined and discussed. Optimization of the system (for weight, volume, safety, costs) is discussed. The device is of the rebreather type, and provides a revitalized breathing gas supply to a crewman for denitrogenization and emergency activities. Engineering drawings and photographs of the device are shown.

Source record↗

NASA NTRS1976

Portable medical status system

The hazards inherent in the Portable Medical Status System are identified, and the measures taken to reduce them to an acceptable level are described. Identification of these hazards is a prerequisite to use of the system on humans in the earth environment. One hazard which is insufficiently controlled and which is considered a constraint to use on humans is the level of current possible in the electrodes for the EEG (electroencephalograph) circuitry. It exceeds the maximum specified. A number of procedural and design recommendations for enhancement of safety are made.

Lindsey, O. C.↗

NASA NTRS1975

The Stanford-Ames portable echocardioscope: A case study in technology transfer

A battery powered echocardioscope is described which was clinically validated on both normal subjects and patients. Its single hand held transducer provides a one dimensional image of the moving cardiac anatomy in real time. Its major advantages over existing ultrasonoscopes are its simplicity, portability, dc operation, and potentially lower production costs. Its versatility and diagnostic value were demonstrated by experienced echocardiographers.

Schmidt, G.↗

NASA NTRS1977

A low cost, portable instrument for measuring emittance

A low cost, portable instrument was developed with which emittance can be measured by comparison to a standard. A reflector collects infrared radiation from a heated sample onto a low mass, black detector and the temperature rise of the black detector is measured with a thermocouple and meter. Graphical examples are presented for determination of emittance from measurements made on a sample at any known temperature.

Mcdonald, G.↗

NASA NTRS1976

Insolation measurements with a portable CuS-CdS radiometer

Solar radiation measurements were carried out with a portable Cu2S-Cds radiometer. The measurements were found to be accurate to better than 5% (better than 3% when sophisticated metering is employed). Calibration to an Eppley precision pyranometer is discussed.

Windawi, H. M.↗

NASA NTRS1975

The Stanford-Ames portable echocardioscope - A case study in technology transfer

The paper describes a lightweight portable battery-powered echocardioscope fabricated largely from readily available components. The transducer contains a piezoelectric crystal which acts as both an ultrasound pulse emitter and echo receiver, and the oscilloscope is of modular construction. The oscilloscope display can be produced in any of three different modes: A-mode, B-mode, and M-mode (time-motion) by sweeping the intensified points of light of the B-mode display vertically along the oscilloscope face. The resulting display can be photographed in a time exposure, thus providing a hardcopy record for the patient's chart or physician's records. The device is clinically validated on both normal subjects and patients by experienced echocardiographers.

Schmidt, G.↗

NASA NTRS1977

A portable personal cooling system for mine rescue operations

Design of a portable personal cooling system to reduce physiological stress in high-temperature, high-humidity conditions is discussed. The system, based on technology used in the thermal controls of space suits, employs a combination of head and thoracic insulation and cooling through a heat sink unit. Average metabolic rates, heart rates, rectal temperature increase and sweat loss were monitored for test subjects wearing various configurations of the cooling system, as well as for a control group. The various arrangements of the cooling garment were found to provide significant physiological benefits; however, increases in heat transfer rate of the cooling unit and more effective insulation are suggested to improve the system's function.

Webbon, B.↗

NASA NTRS1978

Portable spark-gap arc generator

Self-contained spark generator that simulates electrical noise caused by discharge of static charge is useful tool when checking sensitive component and equipment. In test set-up, device introduces repeatable noise pulses as behavior of components is monitored. Generator uses only standard commercial parts and weighs only 4 pounds; portable dc power supply is used. Two configurations of generator have been developed: one is free-running arc source, and one delivers spark in response to triggering pulse.

Ignaczak, L. R.↗

NASA NTRS1978

A portable L-band voice transceiver for satellite communication

A portable L-band voice transceiver was developed as a feasibility model and can provide a half-duplex voice link to another terminal via the L-band transponder on the Applications Technology Satellite, ATS-6. The narrow band FM transceiver utilizes commercial subsystems including a UHF transceiver, provides an RF output power of 20 watts, weights less than 25 lbs., is housed in a plastic briefcase, can be powered by an automobile electrical system, and has been successfully operated with ATS-6 on numerous occasions. Design considerations and operation of the transceiver are described, along with alignment and testing procedures, packaging and cost considerations, subsystem performance requirements and overall transceiver performance characteristics.

Maruschak, J.↗

NASA NTRS1978

DSN portable zero delay assembly

Design and test data on portable zero delay assemblies are reported. These assemblies are field-use delay standards to periodically calibrate the block 4 translator ranging paths at each 64-m antenna Deep Space Station.

Serhal, E. J., Jr.↗

NASA NTRS1977

A low cost, portable instrument for measuring emittance

A low cost, portable instrument has been developed with which emittance can be measured by comparison to a standard. A reflector collects infra-red radiation from a heated sample onto a low mass, black detector and the temperature rise of the black detector is measured with a thermocouple and meter. Graphical examples are presented for determination of emittance from measurements made on a sample at any known temperature.

Mcdonald, G.↗

NASA NTRS1978

Portable He-3 detector cryostat for the far infrared

The design of a portable He-3 cryostat for far infrared detection applications is described, with a cutaway drawing of the cryostat, including bolometer and cooled optics, provided. Consideration is given to the selection and testing of various bolometer materials, including Ge:Ga and Ge:InSb; the resistance-temperature coefficients of the materials examined are presented. The absolute flux calibration of the detector system using a new temperature-modulated cold source method is described.

Radostitz, J. V.↗

NASA NTRS1978

Portability and the National Energy Software Center

The software portability problem is examined from the viewpoint of experience gained in the operation of a software exchange and information center. First, the factors contributing to the program interchange to date are identified, then major problem areas remaining are noted. The import of the development of programming language and documentation standards is noted, and the program packaging procedures and dissemination practices employed by the Center to facilitate successful software transport are described. Organization, or installation, dependencies of the computing environment, often hidden from the program author, and data interchange complexities are seen as today's primary issues with dedicated processors and network communications offering an alternative solution.

Butler, M. K.↗

NASA NTRS1981

Portable zero-delay assembly

Instrument is calibrated using back-to-back method. In comparison standard, S-X isolators are opposite from device being tested to permit signal flow in reverse direction. After calibration portable zero-delay assembly (PZDA) is used to set time delays of deep-space network ground-station ranging systems. Approach is also used to calibrate microwave links in other communications systems.

Franco, M. M.↗

NASA NTRS1980

Portable device for use in starting air-start-units for aircraft and having cable lead testing capability

A portable device for starting aircraft engines and the like is disclosed. The device includes a lead testing and motor starting circuit characterized by: (1) a direct current voltage source, (2) a pair of terminal plugs connected with the circuit (each being characterized by a first, second, and third terminal) (3) a pair of manually operable switches for connecting the first terminal of each plug of the pair to the positive side of the voltage source, (4) a circuit lead connecting to the second terminal of each plug the negative side of said source, (5) a pair of electrical cables adapted to connect said first and second terminals of each plug to an air-start unit, and means for connecting each cable of the pair of cables between the first terminal of one plug and the third terminal of the other plug of the pair, and (6) a second pair of manually operable switches for selectivity connecting the third terminal of each plug of the pair to the negative side of the voltage source.

Rosier, W. R.↗

NASA NTRS1979

Development of the electrochemically regenerable carbon dioxide absorber for portable life support system application

As the length of manned space missions increase, more ambitious extravehicular activities (EVAs) are required. For the projected longer mission the use of expendables in the portable life support system (PLSS) will become prohibited due to high launch weight and volume requirements. Therefore, the development of a regenerable CO2 absorber for the PLSS application is highly desirable. The paper discusses the concept, regeneration mechanism, performance, system design, and absorption/regeneration cycle testing of a most promising concept known as ERCA (Electrochemically Regenerable CO2 Absorber). This concept is based on absorbing CO2 into an alkaline absorbent similar to LiOH. The absorbent is an aqueous solution supported in a porous matrix which can be electrochemically regenerated on board the primary space vehicle. With the metabolic CO2 recovery the ERCA concept results in a totally regenerable CO2 scrubber. The ERCA test hardware has passed 200 absorption/regeneration cycles without performance degradation.

Woods, R. R.↗

NASA NTRS1980

A Portable Oxygen Subsystem - Description and preliminary thermal performance prediction

This paper describes the use, operation, and preliminary thermal modeling of a Portable Oxygen Subsystem (POS). The POS is a partial rebreather which is being developed for Shuttle Orbiter support. Normally used as a pre-breather for denitrogenization prior to EVA, this semi-closed, breath powered breathing system can also be used for emergencies in the event of a contaminated or oxygen-deficient cabin atmosphere, to support an emergency transfer between vehicles, or as a clean oxygen supply in the event of a contaminated ambient atmosphere in the vicinity of the Orbiter after landing.

Sribnik, F.↗

NASA NTRS1981

Portable appliance security apparatus

An apparatus for securing a small computer, or other portable appliance, against theft is described. It is comprised of a case having an open back through which the computer is installed or removed. Guide members in the form of slots are formed in a rear portion of opposite walls of the case for receiving a back plate to cover the opening and thereby secure the computer within the case. An opening formed in the top wall of the case exposes the keyboard and display of the computer. The back plate is locked in the closed position by a key-operated plug type lock. The lock is attached to one end of a hold down cable, the opposite end thereof being secured to a desk top or other stationary object. Thus, the lock simultaneously secures the back plate to the case and retains the case to the stationary object.

Kerley, J. J.↗