Preparation method for magnetic microsphere supported high-molecular catalyst

The invention relates to a preparation method for a magnetic microsphere supported high-molecular catalyst and belongs to the technical field of preparation process of chemical catalysts. The high-molecular catalyst is a novel core/shell type heterogeneous catalyst and has the following characteristics that an inorganic magnetic material is adopted as an inner core, a high-molecular material is adopted as a shell, a catalytic center is supported by the covalent bonds and coordinate bonds on the high-molecular surface, certain magnetism is achieved, and the catalyst can be conveniently separated, recycled and applied from a reaction system. The catalytic center with diversified functions is supported by modifying the high-molecular surface, and the adaptability to various different application occasions can be achieved. The process is simple in process, is environmentally friendly and conforms to the trend of green chemistry.

Shrimp roe sauce and preparation method thereof

The invention discloses a shrimp roe sauce and a preparation method thereof. The shrimp roe sauce is characterized by comprising the following raw materials in parts by weight: 100 parts of shrimp roe zymolyte, 8-14 parts of salt, 3-7 parts of yellow rice wine, 3-7 parts of white granulated sugar, and 10 parts of 2-3wt% xanthan gum mother liquor, wherein the shrimp roe zymolyte is obtained by carrying out enzymolysis on shrimp roes by alkaline protease at 50-60 DEG C for 3-4 hours; the weight ratio of the alkaline protease to the shrimp roes is (0.04-0.06):100. The preparation method comprises the following steps: evenly mixing the shrimp roe zymolyte with the salt, and the fermenting for 6-8 days for the first time in a dark place; pulping the shrimp roe zymolyte which is fermented once and then adding the yellow rice wine and the white granulated sugar; evenly stirring and then boiling for 25-30 minutes; cooling and fermenting in the dark place at room temperature for 13-15 days for the ...

Underwater detection and communication integrated emission signal design and processing method

According to the underwater detection and communication integrated emission signal design and processing method provided by the invention, the characteristics of strong orthogonality and good resolution of a generalized sine frequency modulation signal are fully utilized, and a GSFM signal is used as a carrier of an integrated signal; firstly, a baseband signal product of a detection signal and a communication signal is used as an integrated signal, so that the communication signal fully utilizes the energy of the detection signal; the method comprises the following steps: firstly, receiving end signals are received, then an improved single-channel blind separation algorithm is utilized to separate the receiving end signals to obtain independent detection signals and communication signals, finally, the separated communication signals are decoded, and direct wave signal offset and target detection processing are carried out on the separated detection signals.

Wideband adaptive matching method and apparatus for submarine sound signal transmitter

The invention discloses a wideband self-adaptive matching method of a water sound signal transmitter and a device thereof, relating to a water sound signal transmitting system. The system provides a wideband self-adaptive matching device of a water sound signal transmitter and a self-adaptive matching method thereof. The self-adaptive matching device is provided with a matching network and a digital signal processor. The method comprises the following steps: 1. a characteristic parameter of a to-be-transmitted energy converter is measured, and an operating frequency range is determined; 2. a wideband self-adaptive matching water sound transmitting system is constructed; 3. a to-be-transmitted signal of a module collection signal generator is extracted by the transmitting signal parameters of a digital signal processor, the characteristic parameter is analyzed and input to the parameter analytical module of the transmitting energy converter; 4. a band pitch matching work mode is determined ...

Underwater vehicle trailing beacon based on plasma pulse signals

The invention discloses an underwater vehicle trailing beacon based on plasma pulse signals. The underwater vehicle trailing beacon is composed of a watertight compartment, a power supply system, a plasma beacon sound source and a code control system. A stable working environment is provided for the power supply system, the plasma beacon sound source and the code control system by the watertight compartment, and the watertight compartment is mechanically and electrically connected with an underwater vehicle. Energy is supplied to the plasma beacon sound source and the code control system through the power supply system. The plasma beacon sound source is composed of an electronic control system, a charging system, a power storage system, a triggering circuit, a triggering switch and a discharging electrode. The code control system is composed of a power supply system interface circuit, an underwater vehicle interface circuit, a plasma beacon sound source interface circuit and a microprocessor ...

Portable underwater strong sound source

The invention provides a portable underwater strong sound source. The portable underwater strong sound source is composed of a remote control system, an underwater charging and energy storage cabin and an underwater discharging cabin; the remote control system is used for receiving power input, setting system control parameters and sending power output signals and charging and discharging control signals to the underwater charging and energy storage cabin through a flexible watertight cable; the underwater charging and energy storage cabin provides a stable watertight working environment for a charging system and an energy storage system of the underwater strong sound source, and the underwater discharging cabin achieves underwater plasma electric-acoustic conversion and energy-gathered directional radiation of strong sound pulses; the underwater charging and energy storage cabin is connected with the underwater discharging cabin in a fastened mode so as to form an integrated watertight ...

Combined electric spark pulse sound source

A combined electric-spark sound source comprises a high-voltage charge power supply (1), an energy-storage and discharge module (2), a time-sequence pulse generator (3), a transmission line (4) and a discharge electrode (5). The high-voltage charge power supply (1) charges the energy-storage and discharge module (2) to a preset value, the time-sequence pulse generator (3) sends out multipaths of trigger pulse signals of different time intervals to trigger the discharge switch of the energy-storage and discharge module (2) into conduction, and the power energy stored in an energy-storage capacitor is released in water through the transmission line (4) and the discharge electrode (5). The energy-storage and discharge module (2) can be caused to discharge according to a certain time sequence by adjusting the time interval of the trigger pulse, and the basic frequency of the sound waves generated due to discharge can be adjusted within a certain range.

Differential cyclic shift spread-spectrum underwater sound communication method

The invention discloses a differential cyclic shift spread-spectrum underwater sound communication method, which comprises the following steps: forming a basic spread-spectrum code by 1 to 2 spread-spectrum codes, and adopting a phase or a frequency to modulate a carrier wave to form a corresponding basic spread-spectrum waveform; at a communication sending end, determining the size of cyclic shift according to information to be sent, carrying out differential cyclic shift for the basic spread-spectrum waveform so as to realize multi-modulation, and sending the cyclic shift waveform into an underwater sound channel through a transmitting transducer; adopting a channel matching and filtering method to carry out multi-path combination at a receiving end; and using FFT to carry out quick cyclic correlation for received signals, judging the size of the cyclic shift according to a peak value of a related output waveform, and further carrying out decoding. The method effectively improves the ...

Method for preparing chitose magnetic microsphere metal palladium complex catalyst

Wideband adaptive matching method and apparatus for submarine sound signal transmitter

The invention discloses a wideband self-adaptive matching method of a water sound signal transmitter and a device thereof, relating to a water sound signal transmitting system. The system provides a wideband self-adaptive matching device of a water sound signal transmitter and a self-adaptive matching method thereof. The self-adaptive matching device is provided with a matching network and a digital signal processor. The method comprises the following steps: 1. a characteristic parameter of a to-be-transmitted energy converter is measured, and an operating frequency range is determined; 2. a wideband self-adaptive matching water sound transmitting system is constructed; 3. a to-be-transmitted signal of a module collection signal generator is extracted by the transmitting signal parametersof a digital signal processor, the characteristic parameter is analyzed and input to the parameter analytical module of the transmitting energy converter; 4. a band pitch matching work mode is determined ...

Method for Doppler estimation and synchronization of mobile water sound communication signal

The invention discloses a method for the Doppler estimation and synchronization of a mobile water sound communication signal, which comprises the following steps: selecting two chirp signals and using a time interval between the two chirp signals as a frame synchronizing signal; sampling a receipt signal, performing cross-correlation treatment of a receipt sampling signal and a delay signal thereof, calculating an absolute value of a correlation function, comparing the absolute value with a threshold and continuing to perform sliding-correlation treatment if the absolute value is smaller than the threshold; if the absolute value is greater than the threshold, determining the arrival of a synchronizing signal, doubling the length of an observation window of the cross-correlation treatment, calculating a correlation function of the receipt sampling signal and the delay signal thereof, calculating the absolute value of the correlation function, determining the time corresponding to a maximum ...

Electronic device

The invention provides an electronic device which comprises a screen assembly, a system assembly and a rotating shaft assembly, the rotating shaft assembly comprises a connecting shaft, a first support, a second support and a base, the first support is rotationally connected with the connecting shaft, the screen assembly is fixed to the first support and can rotate around the connecting shaft, and the second support is used for arranging the connecting shaft; the base is fixed to the system assembly and rotationally connected with the second support through a rotating structure, the rotating structure is provided with a rotating center line, the second support can rotate around the rotating center line relative to the base, the rotating center line and the connecting shaft meet the perpendicular condition, and the system assembly comprises a shell opposite to the screen assembly. The shell is provided with a mounting hole, the base is limited to be arranged in the mounting hole along the ...

Hyperbolic frequency-modulation spread spectrum acoustic communication method

The invention discloses a hyperbolic frequency-modulation spread spectrum acoustic communication method, comprising the following steps: forming a basic waveform by two hyperbolic frequency-modulation signals which respectively have negative modulation rate and passive modulation rate; according to information to be sent and a preset shift step size, determining the shift of a carrier signal; carrying out cyclic shift on the carrier signal to realize multielement modulation; applying a pilot signal to the cyclic shift carrier signal to form a compound signal; sending the compound signal to an acoustic channel by a transmitting transducer; estimating the relevant output peak value position of the pilot signal and the carrier signal by the related duplicate technology on a receiving terminal; comparing the difference of relevant output peak value position of the pilot signal and the relevant output peak value position of the carrier signal with the shift step size; and looking up a table ...

Warship hull descaling and flaw detecting system

The invention provides a warship hull descaling and flow detecting system which comprises a power supply system, a control system, a charging system, an energy storing system, a plasma shock wave generating mechanism, a flaw detection monitoring system, a surface flushing mechanism and an adsorbing and walking robot. When the system runs, probes of the plasma shock wave generating mechanism, the surface flushing mechanism, the adsorbing and walking robot and the flaw detection monitoring system are in underwater operation. Organisms attached to the surface of a warship hull are subjected to primary cleaning by the aid of strong sound shock waves generated from discharging of underwater plasmas, the organisms attached to the surface of the warship hull fall off or are loosened, and then the loosened attachments are cleaned by the aid of the surface flushing mechanism. The descaling effect can be detected through the flaw detecting system after descaling operation, and non-destructive detection ...