Abstract:
A card-type signal power detection device which has a low-noise amplification function therein and is capable of receiving a low-power signal and detecting the power of the received signal, and a frequency analysis apparatus which is capable of analyzing the frequency of the received signal under the condition that the card-type signal power detection device is mounted to a portable terminal device. The signal power detection device includes a radio frequency amplification circuit for attenuating and low-noise amplifying input signals, an intermediate frequency amplification circuit for converting an output signal from the radio frequency amplification circuit into a desired intermediate frequency signal and detecting power of the converted intermediate frequency signal, a local signal generator for supplying to the intermediate frequency amplification circuit a frequency signal corresponding to the intermediate frequency signal, and a digital signal processor for digitizing the signal power detected by the intermediate frequency amplification circuit such that it is appropriate to an interface standard, outputting the digitized result to the portable terminal device via an interface and supplying a desired reference frequency to the local signal generator. The detection device is of a thin card type.
Abstract:
A device and method for measuring dynamic thermal conductivity of micro-structure fluid. The device includes an upper fixing plate (110a) and a lower fixing plate (110b) which are vertically spaced apart from each other, a lower body (150b) which defines a side surface of a separation space formed between the upper fixing plate and the lower fixing plate, a rotating plate (120) which is disposed in the separation space in such a way that gaps are respectively formed among the rotating plate and the upper and lower fixing plates, a shaft (140) which passes through the upper fixing plate and is coupled to the rotating plate, a heater which installed on an upper portion of the upper fixing plate, and thermocouples (118a) and (118b) which are respectively installed in the upper and lower fixing plates.
Abstract:
Disclosed herein is a flash tank of a two-stage compression heat pump system that can perform cooling and heating with a separate type intercooler and a high-stage compressor protecting device. The system comprises a fluid-level detecting sensor for detecting the fluid-level of the refrigerant, an alarm sensor for notifying the saturated state of the refrigerant filled in the flash tank, an evaporator pressure sensor for measuring and notifying the pressure of the refrigerant flowing into the evaporator, a condenser pressure sensor for measuring and notifying the pressure of the refrigerant flowing out of the condenser, a flash tank fluid-level controller for receiving signals from the above sensors and controlling intermediate pressure and the fluid-level of the flash tank, and a bypass valve controller for controlling a bypass valve that receives signals from the alarm sensor and allowing a refrigerant to directly flow from the low-stage compressor to the high-stage compressor.
Abstract:
A device and method for measuring dynamic thermal conductivity of micro-structure fluid. The device includes an upper fixing plate (110a) and a lower fixing plate (110b) which are vertically spaced apart from each other, a lower body (150b) which defines a side surface of a separation space formed between the upper fixing plate and the lower fixing plate, a rotating plate (120) which is disposed in the separation space in such a way that gaps are respectively formed among the rotating plate and the upper and lower fixing plates, a shaft (140) which passes through the upper fixing plate and is coupled to the rotating plate, a heater which installed on an upper portion of the upper fixing plate, and thermocouples (118a) and (118b) which are respectively installed in the upper and lower fixing plates.