摘要:
A compressed air foam system for use in extinguishing fire includes a conduit, a water flow sensor, a foam proportioning apparatus, an air conduit, an air flow sensor, an air flow control valve and a system controller. The water flow sensor is configured to sense a water flow rate through the conduit. The air flow sensor is configured to sense an air flow rate through the air conduit. The system controller has a user adjustable ratio input. The system controller is configured to receive the sensed water flow rate, to receive the sensed air flow rate, to output a first control signal to the air flow control valve and to output a second control signal to the foam proportioning apparatus. The system controller automatically adjusts the first and second control signals to maintain a ratio of air flow to foam flow based upon the user adjustable ratio input.
摘要:
The pocketed bicep cuff has retention on a bicep at a bulge area. The bulge area is designed to bulge with a human bicep. The bulging constricts the lower side and the upper side against the bicep so that articles in a pocket section do not move when the arm is moved. A zipper provides access to the pocket section. At the upper side, hook and loop tape secure the upper periphery against the muscle area where the bicep and tricep begin and are attached at the tendons to the bone. Preferably, a looped tape sleeve with a buttonhole provides adherence to hook tape which secures the upper side to the bicep. The upper opening is substantially circular when in use conforming to a bicep upper portion. The bulge area also bulges downward at the tricep so that articles are held against the bicep.
摘要:
One of the challenges for airports is to provide effective emergency response training in the event of aircraft emergency scenarios. For airports there is the additional expense to provide that training that is typically performed at a remote facility. A portable inflatable training aircraft will provide this training and reduces the cost to the airport management so that the training can be ongoing and effective without interfering with the normal operation of the airport.
摘要:
In a voltage controlled oscillator in which an operation frequency is determined by applying a tuning voltage to a resonant circuit connected to a control terminal of a transistor (T1), the resonant circuit has zeroth and first varactor diodes (D0, D1) which can serve as capacitance elements. A selection voltage is applied to an anode of the first varactor diode through a band selection terminal (1). The first vatactor diode has a capacitance varying in response to the value of the selection voltage. The variation of the capacitance causes a change of a frequency band of the voltage controlled oscillator. A tuning voltage is applied through a tuning terminal (2).