Abstract: Methylopila sp. and use thereof in the selective resolution preparation of (S)-?-ethyl-2-oxo-1-pyrrolidineacetate. Methylopila sp. that produces enzymes is subjected to cell immobilization, and is then applied to the biological resolution of a racemate (R,S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester to prepare high optically pure (S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester, which is further subjected to a hydrolysis reaction to obtain (S)-?-ethyl-2-oxo-1-pyrrolidineacetate. The present invention achieves a high conversion yield up to 50.0% or more, a good stereoselectivity, and an enantiomeric excess value e.e.s (%) of (S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester not less than 99.5; the catalytic efficiency is high; the concentration of the racemic substrate in the resolution reaction is up to 500 g/L, the reaction time does not exceed 15 h, the number of reuse times of the immobilized cells is not lower than 35.

Abstract: A low-pass filter having a notch frequency due to a resonance between a mutual inductance of inductive elements and a capacitance. An exemplary low-pass filter generally includes a first inductive element having a first terminal and a second terminal, the first terminal being coupled to the input port, and a second inductive element having a first terminal and a second terminal, the first terminal of the second inductive element being coupled to the second terminal of the first inductive element and the second terminal of the second inductive element being coupled to the output port. The filter also includes a shunt capacitive element coupled to the second terminal of the first inductive element, wherein a mutual inductance between the first inductive element and the second inductive element and a capacitance of the shunt capacitive element are configured to have a resonance providing a notch frequency for the low-pass filter.

Abstract: A low-pass filter having a notch frequency due to a resonance between a mutual inductance of inductive elements and a capacitance. An exemplary low-pass filter generally includes a first inductive element having a first terminal and a second terminal, the first terminal being coupled to the input port, and a second inductive element having a first terminal and a second terminal, the first terminal of the second inductive element being coupled to the second terminal of the first inductive element and the second terminal of the second inductive element being coupled to the output port. The filter also includes a shunt capacitive element coupled to the second terminal of the first inductive element, wherein a mutual inductance between the first inductive element and the second inductive element and a capacitance of the shunt capacitive element are configured to have a resonance providing a notch frequency for the low-pass filter.

Abstract: A low noise amplifier may include a post distortion cancellation block coupled to the low noise amplifier. The post distortion cancellation block may include a diode, and phase-shift logic. The phase-shift logic may be coupled in series with the diode.

Abstract: Methylopila sp. and use thereof in the selective resolution preparation of (S)-?-ethyl-2-oxo-1-pyrrolidineacetate. Methylopila sp. that produces enzymes is subjected to cell immobilization, and is then applied to the biological resolution of a racemate (R,S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester to prepare high optically pure (S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester, which is further subjected to a hydrolysis reaction to obtain (S)-?-ethyl-2-oxo-1-pyrrolidineacetate. The present invention achieves a high conversion yield up to 50.0% or more, a good stereoselectivity, and an enantiomeric excess value e.e.s(%) of (S)-?-ethyl-2-oxo-1-pyrrolidineacetic acid ethyl ester not less than 99.5; the catalytic efficiency is high; the concentration of the racemic substrate in the resolution reaction is up to 500 g/L, the reaction time does not exceed 15 h, the number of reuse times of the immobilized cells is not lower than 35.

Abstract: A low noise amplifier may include a post distortion cancellation block coupled to the low noise amplifier. The post distortion cancellation block may include a diode, and phase-shift logic. The phase-shift logic may be coupled in series with the diode.

Abstract: A method and apparatus for adjusting timeslot fragments of multiple links in an Automatically Switched Optical Network (ASON). The method includes the steps of: obtaining link information of multiple links necessary for timeslot fragment adjustment, calculating adjusted link information of each link according to the link information, and adjusting a timeslot allocation of each link according to the adjusted link information.

Abstract: A sensing system is provided that includes a transceiver. The transceiver includes a transmitter chain that transmits a double-sideband signal having first and second frequency components, and a receiving chain that receives the double-sideband signal after it is reflected by a target. The system further includes a baseband circuit for extracting information content from the received double-sideband signal. A separation between a first frequency of the first frequency component and a second frequency of the second frequency component causes a spike in a signal response generated by one sideband of the received double-sideband signal to substantially overlap a null point of a signal response generated by the other sideband of the received double-sideband signal.

Abstract: A method and apparatus for adjusting timeslot fragments of multiple links in an Automatically Switched Optical Network (ASON). The method includes the steps of: obtaining link information of multiple links necessary for timeslot fragment adjustment, calculating adjusted link information of each link according to the link information, and adjusting a timeslot allocation of each link according to the adjusted link information.

Abstract: A sensing system (100) is provided that includes a transceiver (102). The transceiver includes a transmitter chain that transmits a double-sideband electromagnetic wave having first and second frequency components, and a receiving chain that receives the double-sideband electromagnetic wave after it is reflected by a target. The system (100) further includes a baseband circuit (104) for extracting information content from the double sideband electromagnetic wave. A separation between the first and second frequency components causes a spike in a signal response generated by one sideband of the double-sideband electromagnetic wave to substantially overlap a null point of a signal response generated by the other sideband of the double-sideband electromagnetic wave.