Abstract: An inflatable pressure structure includes an airtight flexible membrane having collapsed and inflated configurations. The inflatable pressure structure includes an elongated pressure-assisted seal that is configured to selectively seal an opening in the airtight flexible membrane. The pressure-assisted seal includes first and second seal components that sealingly engage one another and prevent escape of gas from inside the airtight flexible membrane. The airtight flexible membrane, when inflated, generates a force transverse to the pressure-assisted seal tending to pull the first and second seal components apart. Pressurized gas inside the airtight flexible membrane causes the first and second seal components to more securely engage one another whereby a force transverse to the pressure-assisted seal does not disengage the first and second seal components.

Abstract: An inflatable pressure structure includes an airtight flexible membrane having collapsed and inflated configurations. The inflatable pressure structure includes an elongated pressure-assisted seal that is configured to selectively seal an opening in the airtight flexible membrane. The pressure-assisted seal includes first and second seal components that sealingly engage one another and prevent escape of gas from inside the airtight flexible membrane. The airtight flexible membrane, when inflated, generates a force transverse to the pressure-assisted seal tending to pull the first and second seal components apart. Pressurized gas inside the airtight flexible membrane causes the first and second seal components to more securely engage one another whereby a force transverse to the pressure-assisted seal does not disengage the first and second seal components.

Abstract: An ultrasonic ranging and data telemetry system determines a surveyor's position and automatically links it with other simultaneously taken survey data. An ultrasonic and radio frequency (rf) transmitter are carried by the surveyor in a backpack. The surveyor's position is determined by calculations that use the measured transmission times of an airborne ultrasonic pulse transmitted from the backpack to two or more prepositioned ultrasonic transceivers. Once a second, rf communications are used both to synchronize the ultrasonic pulse transmission-time measurements and to transmit other simultaneously taken survey data. The rf communications are interpreted by a portable receiver and microcomputer which are brought to the property site. A video display attached to the computer provides real-time visual monitoring of the survey progress and site coverage.

Abstract: A personal radiation monitor of the chirper type is provided for detecting ionizing radiation. A battery powered high voltage power supply is used to generate and apply a high voltage bias to a G-M tube radiation sensor. The high voltage is monitored by a low-loss sensing network which generates a feedback signal to control the high voltage power supply such that the high voltage bias is recharged to +500 VDC when the current pulses of the sensor, generated by the detection of ionizing radiation events, discharges the high voltage bias to +450 VDC. During the high voltage recharge period an audio transducer is activated to produce an audible "chirp". The rate of the "chirps" is controlled by the rate at which the high voltage bias is recharged, which is proportional to the radiation field intensity to which the sensor is exposed. The chirp rate sensitivity is set to be approximately 1.5 (chirps/min/MR/hr.).