Intelligent and wireless book borrowing and recording system

The invention discloses an intelligent and wireless book borrowing and recording system and relates to an improvement on the intelligent and wireless book borrowing and recording system. The intelligent and wireless book borrowing and recording system has the advantages that the use is convenient; queuing up is not needed; and book borrowing and book returning can be normally carried out when fault happens. The system of the invention comprises a microcontroller, a wireless communication module, an amplifier module, a comparator module, a data acquisition module, a data analysis module, an input control module, an output control module, and a borrowing and recording terminal, and is characterized in that the microcontroller, the wireless communication module, the amplifier module, the comparator module, the data acquisition module, the data analysis module; the input control module, the output control module and the borrowing and recording terminal are sequentially connected.

Synthesis method for tetraallyl(dimethyl)silane

Belonging to the technical field of high polymer material synthesis, the invention specifically relates to a synthesis method for tetraallyl(dimethyl)silane, which serves as the core of hyperbranched polycarbosilane. The method includes: dissolving excessive CH3C2H3SiCl2 and CH3HSiCl2 in THF, taking H2PtCl6 as a catalyst to carry out hydrosilylation reaction, and employing infrared detection in the reaction process, ending the reaction when an absorption peak at 1598cm<-1> disappears, mixing tetraallyl(dimethyl)silane-Cl and certain CH2CHCH2Cl exceeding by 4-10% with THF, under the protection of nitrogen, adding the mixture dropwise into a heated magnesium and THF mixed system, controlling the dropping speed to keep the reaction under a micro-boiling state, ending the reaction after 15-18h, conducting pumping filtration to remove salt, reducing pressure to remove the solvent, thus obtaining a colorless transparent liquid, i.e. tetraallyl(dimethyl)silane.

System and method for collecting urokinase crude extract

The invention discloses a urokinase crude extract collecting system and method. In the system, a buffer tank is communicated with each collecting area and a circulating box; an inner cavity of the circulating box is sequentially divided into a first inner cavity, a second inner cavity and a third inner cavity through two screen plates, and an automatic feeding device is arranged above the circulating box; a first liquid inlet branch pipe is arranged in the first inner cavity and is communicated with a pump inlet pipe of the first water pump; a second liquid inlet branch pipe is arranged in the second inner cavity and is communicated with the collecting box; a third liquid inlet branch pipe is arranged in the third inner cavity and is communicated with a pump inlet pipe of the first water pump; a pump outlet pipe of the first water pump is communicated with the first liquid inlet branch pipe, the second liquid inlet branch pipe and the third liquid inlet branch pipe; a filtering device is ...

Novel broadband radio frequency source

The invention relates to a novel broadband radio frequency source and particularly relates to improvement of the novel broadband radio frequency source, belonging to the technical field of telecommunication. The novel broadband radio frequency source has stable performance and strong anti-jamming capacity. The novel broadband radio frequency source comprises a loop filter, an output impedance matcher, a transmitter phase lock loop (PLL), a power supply, a filter attenuation network, an amplifier and a switch. The novel broadband radio frequency source is characterized in that the loop filter and the transmitter PLL are connected with the power supply through the switch; the transmitter PLL is connected with the power supply through the amplifier; the power supply is also connected with the filter attenuation network, a broadband frequency synthesizer and the output impedance matcher.

Preparation process and preparation device of urokinase

The invention relates to the technical field of biological enzyme extraction, and discloses a preparation process and a preparation device of urokinase, and the preparation process comprises the following steps: S1, urinating by a urinating person; s2, storing urine by a urine collecting device, and taking urine by a sampling device; s3, detecting the urine by a detection device, and collecting a first stock solution and a second stock solution according to a detection result; s3-1, acidifying the first stock solution, centrifuging, filtering out precipitates to obtain a first treatment solution, and adsorbing, eluting and filtering the first treatment solution to obtain a urokinase crude product; s3-2, adsorbing, eluting and filtering the second stock solution to obtain a urokinase crude product; the preparation device comprises a urine collection device used for directly collecting urine from a urine supplier, a sampling device used for obtaining the urine and a detection device used ...

Self-repairing anti-oxidation hydrogel dressing for treating oral wound and preparation method of self-repairing anti-oxidation hydrogel dressing

The invention discloses a self-repairing antioxidant hydrogel dressing for treating oral wounds, which comprises the following components by weight: 0.1-1g of acrylic acid, 0.5-3g of acrylamide, 0.1-1g of N, N-dimethylformamide, 0.1-1g of N, N-dimethylformamide, 0.1-1g of N, the dressing has the advantages of being high in wet adhesion, excellent in mechanical property and good in stability, peroxide can be removed, tissue regeneration and repair can be promoted, and the preparation method of the dressing comprises the specific steps that S1, acrylic acid and acrylamide are taken and added into an aqueous solution, the mixture is stirred to be uniform, and a mixed solution is obtained; then, N, N '-methylene bisacrylamide is added into the solution A, and a solution A is obtained; and S2, adding a catalyst into the solution A, uniformly mixing, and adding ammonium persulfate into the solution A to initiate free radical polymerization to obtain the specific adhesive hydrogel for diabetic ...

Improved urokinase adsorption column

According to the technical scheme, the improved urokinase adsorption column is characterized in that the improved urokinase adsorption column comprises a supporting frame, the supporting frame comprises an upper buckling frame body and a base plate frame body, the upper buckling frame body and the base plate frame body are connected through a connecting piece, and a middle column body and a resin permeation column are connected to the base plate frame body; the resin permeation column is arranged between the upper buckling frame body and the chassis frame body and sleeves the middle column body, a filling cavity is formed among the resin permeation column, the middle column body and the chassis frame body, the filling cavity is used for filling diatomite for adsorbing urokinase, and a plurality of detection grooves are formed in the outer wall of the middle column body in the circumferential direction; a detection assembly and a film sealing disc are arranged in the detection groove, the ...

Preparation method of test solution for content determination of Guangxi total flavone dispersible tablets

Belonging to the technical field of drug component determination, the invention specifically relates to a preparation method of a test solution for content determination of Guangxi total flavones (GXTF) dispersible tablets. Characterized by simple operation and cost saving, the method includes: weighing a prescribed dosage of GXTF accounting for 30-48% of the total, mixing the GXTF with a amount of PVPP, MCC and pregelatinized starch uniformly, adding a 10-15% PVP.K30 water solution of SLS to make a soft material, carrying out sieving, granulation, drying and grain finishing, additionally adding an appropriate amount of PVPP, MCC and pregelatinized starch, then adding a right amount of aerosil, and carrying out uniform mixing and tabletting to a tablet weight of 0.25g; taking 20 tablets and grinding them, weighing 25mg precisely and placing the tablet powder in a 50mL measuring flask, adding 40mL of 50% methanol to conduct ultrasonic treatment for 30min, then adding a proper amount of 50% ...

Locating demodulation chip for mobile broadcasting signal

The invention discloses a locating demodulation chip for a mobile broadcasting signal. The chip comprises a receiving demodulation module and a measurement module, wherein, the receiving demodulation module is used for demodulating a locating spread spectrum signal inter cut in a time slot head or a transmission frame header of the received mobile broadcasting signal so as to obtain navigation message information; and the measurement module is used for measuring and obtaining location feature parameters. The demodulation chip for the mobile broadcasting signal can be used for normally demodulating broadcasting data in the mobile broadcasting signal and can be also used for demodulating the locating spread spectrum signal inter cut in the time slot head or the transmission frame header of the mobile broadcasting signal so as to obtain the navigation message information and the location feature parameters, thus effectively improving the location accuracy.

Preparation method for hydrophobic type PA6/silicon dioxide organic-inorganic hybrid material

A preparation method for a hydrophobic type PA6/silicon dioxide organic-inorganic hybrid material belongs to the technical field of synthesis of high-molecular materials. The invention provides the preparation method for the hydrophobic type PA6/silicon dioxide organic-inorganic hybrid material which can be used as an engineering material in a humid environment. The method comprises: under the catalytic effect of NaOH, adding metered CPL into a three-neck flask, and performing vacuum reaction for 0.5 h to obtain a PA6 precursor; then adding silica sol into the three-neck flask and performing hybrid reaction with the precursor for 1 h; removing ethanol and H2O in the system under a vacuum condition, adding a cocatalyst TDI, and reacting at 90 DEG C for 2 h; and under the protection of N2, raising the temperature of the reaction system and stabilizing at 170 DEG C, reacting for 2 h, and removing incompletely-reacted oligomer in the system under a vacuum condition, so as to obtain a light-yellow ...

Intelligent vehicle system

The invention discloses an intelligent vehicle system, and relates to an improvement on the intelligent vehicle system. The intelligent vehicle system of the invention is stable in performance and fast in curve running speed. The intelligent vehicle system comprises a controller, a motor, a comparator, a fan, an actuator, an airflow sensor, a speed sensor, a voltage-stabilizing circuit, an LED, a memory, and a power supply, and is characterized in that the speed sensor, the airflow sensor and the voltage-stabilizing circuit are connected with an input port of the controller; the output port of the controller is connected with the actuator, the motor and the LED; and the controller is also connected with the power supply and the fan.

Alternating current stabilized voltage supply

The invention belongs to the field of electric variable or magnetic variable adjustment systems, particularly relates to an improvement of an alternating current stabilized voltage supply, and provides an alternating current stabilized voltage supply which is stable in performance and has system voltage and frequency display functions. The alternating current stabilized voltage supply comprises an input adjustment module, a rectification module, a DC-DC (Direct Current-Direct Current) voltage boosting module, an H bridge inversion circuit, an output filtering module, a controller, an A/D (Analog to Digital) conversion module, a voltage sampling module, a frequency sampling module and a comparator module, and is characterized in that the input adjustment module and the rectification module are connected with the DC-DC voltage boosting module; the rectification module is connected with the H bridge inversion circuit; the DC-DC voltage boosting module and the H bridge inversion circuit are ...

Preparation method for Guangxi total flavone dispersible tablet

Belonging to the technical field of pharmaceutical synthesis, the invention specifically relates to a preparation method for a Guangxi total flavone (GXTF) dispersible tablet. With the characteristics of simple operation and cost saving, the method includes: weighing a prescribed dosage of GXTF accounting for 30-48% of the total, mixing the GXTF with a amount of PVPP, MCC and pregelatinized starch uniformly, adding a 10-15% PVP.K30 water solution of SLS to make a soft material, carrying out sieving, granulation, drying and grain finishing, additionally adding an appropriate amount of PVPP, MCC and pregelatinized starch, then adding a right amount of aerosil, and carrying out uniform mixing and tabletting to a tablet weight of 0.25g.

Portable door lock

Affinity-improved urokinase chromatographic column and preparation method thereof

The invention discloses a urokinase chromatographic column with improved affinity. The material structure of the urokinase chromatographic column is NH2-C6H5-NH-CH2-CH (OH)-CH2-O-Sepharose-O-CH2-CH (OH)-CH2-NH-C6H5-NH-R. The invention also discloses a preparation method of the urokinase chromatographic column with improved affinity. Wherein R is equal to CO-CH2-N (CH3)-C (NH) NH2; and the Sepharose is sepharose gel. According to the invention, guanidyl bifunctional group-containing molecule-creatine with a short molecular chain is used as an affinity ligand, and trivalent aluminum ions and barium ions in an adsorption liquid are utilized to eliminate the negative effect of nitrogen atoms directly connected with guanidyl. Meanwhile, a spacer arm with relatively high rigidity is formed by coupling p-phenylenediamine and epoxy chloropropane, so that the affinity adsorption of urokinase and guanidyl is improved. As a metabolite of arginine in a human body, the creatine does not generate adverse ...

Web camera

The invention relates to a web camera, and particularly relates to improvement of a device controlling a camera, belonging to the technical field of telecommunication. The web camera has stable performances, strong antijamming capacity and clear images. The web camera comprises an audio-video acquisition module, an audio-video processing module, a control chip and a power module. The web camera is characterized in that a power supply provides power; a complementary metal oxide semiconductor (CMOS) image sensor converts an optical image into an electrical signal, then a vide analogue-digital converter (ADC) chip processes the electrical signal into a digital YCbCr4:2:2(8/16-bit) standard signal and the standard signal is sent to a DM365 for compressed encoding; a comparator processes the compressed and coded standard signal so as to obtain a digital signal; an audio ADC performs A/D conversion on an audio detected by a microwave integrated circuit (MIC), and digitalized audio data is output ...

Synthetic method of pentaerythritol tetrachloracetate

A synthetic method of pentaerythritol tetrachloracetate belongs to the technical field of high molecular material synthesis, and in particular, the invention relates to a synthetic method of pentaerythritol tetrachloracetate. The invention provides pentaerythritol tetrachloracetate. The method of the invention comprises: adding 11-15 g of pentaerythritol into 20 mL of DMF, stirring, adding 56-112 g of CAC in a dropwise manner under the protection of N2; keeping the system temperature to be below 35 DEG C, completing the addition in 1-6 hours, then heating to 60 DEG C, and reacting for 12 hours; precipitating in water, vacuum-drying the precipitate to obtain grey-white powder which is pentaerythritol-tetra(alpha dithiobenzoyloxy)acetate powder.

Synthetic method for pentaerythritol tetra(alpha-dithiobenzoyloxy)acetate

A synthetic method for pentaerythritol tetra(alpha-dithiobenzoyloxy)acetate belongs to the technical field of synthesis of high-molecular materials. The provided synthetic method for pentaerythritol tetra(alpha-dithiobenzoyloxy)acetate comprises: dissolving 4.42 g of pentaerythritol tetrachloroacetate in a three-neck flask containing 15 mL of a solvent, dissolving 14.10 g of DTBA in 20 mL of THF, dropwise adding into the reaction flask at room temperature, heating to 40 DEG C and continuing to react for 5 h; after the reaction is finished, filtering and distilling to remove the solvent; and washing the residue with deionized water, separating, and repeating for two times; and then using a solvent to dissolving the oily substance, and distilling to remove the solvent, so as to obtain a red viscous thick substance which is pentaerythritol tetra(alpha-dithiobenzoyloxy)acetate.

DISC BRAKE

The invention discloses a disk brake for cars. A guide bush is fitted on the mud guard and an engaging bush axially movable is around the guide bush. The engaging bush is in contact with the spiral groove in the booster disk via balls arranged at its external circumference. A control mechanism for the booster disk rotation is positioned beside the disk. A brake spline bush is fitted between the wheel rim and hub, and stop disk, front friction shoe, brake disk and rear friction shoe are successively mounted between the hub and the engaging bush. It has the advantages of wide adaptability, long service life and simple structure.

Doorbell

The invention discloses a doorbell, which relates to an improvement on the structure of the doorbell. The doorbell provided by the invention can be used conveniently by the old, is suitable for being used at night, and is simple in structure. The doorbell comprises light-emitting diodes, a switching power supply, a music chip, a loudspeaker, a doorbell key, a memory module, a transmission module, a comparison module, and an amplifying module, and is characterized in that the light-emitting diodes, the switching power supply, the music chip, the loudspeaker, the doorbell key, the memory module, the transmission module, the comparison module and the amplifying module are sequentially connected.

Device and process for extracting urokinase crude product

The invention provides a urokinase crude product extraction device and a technology thereof.The urokinase crude product extraction device comprises a box body, an adsorption tank, a separation tank and a transfer mechanism are arranged in the box body, a stirring part used for stirring urine and a refrigerating part used for adjusting the temperature are arranged in the adsorption tank, a tank cover is arranged on the adsorption tank, an adsorption part is arranged at the bottom of the tank cover, and a precipitation tank is arranged at the bottom of the adsorption tank; a membrane feeding gap is formed between the adsorption tank and the precipitation tank, a membrane feeding mechanism is further arranged in the box body and is used for conveying a reverse osmosis membrane into the membrane feeding gap, and a pressing piece is arranged at the connecting opening and is used for pressing the reverse osmosis membrane on the precipitation tank; the transfer mechanism is connected with the ...

Positioning method and device based on mobile broadcasting

The invention discloses a positioning method based on mobile broadcasting, comprising the steps of: receiving a mobile broadcasting signal; demodulating a positioning spread spectrum signal, which is inserted in a time slot head or a transmission frame head of the mobile broadcasting signal, to obtain navigation text information, and obtaining a positioning characteristic parameter through measurement; and obtaining positioning data according to the positioning characteristic parameter and the navigation text information. Correspondingly, the invention discloses a positioning device based on mobile broadcasting. The time slot head or the transmission frame head of the mobile broadcasting signal is used to carry the positioning spread spectrum signal, the positioning spread spectrum signal is modulated to obtain the navigation text information and the positioning characteristic parameter is obtained through measurement to further obtain the positioning data, therefore, the positioning precision ...

Preparation method for carboxymethyl cellulose grafted copolymer

Belonging to the technical field of high polymer material synthesis, the invention specifically relates to a preparation method for a carboxymethyl cellulose grafted copolymer, which is applied to heavy metal-containing wastewater treatment. The method includes: adding a proper amount of carboxymethyl cellulose and monomeric acrylamide into a reactor containing distilled water, introducing nitrogen and conducting stirring for 30-50min, raising the temperature to a predetermined reaction temperature, adding a certain amount of 0.1mol/L ammonium cerium nitrate solution till a predetermined reaction time; subjecting the product to precipitation by acetone and washing, and performing drying to a constant weight at 50-80DEG C so as to obtain a product; taking a three-neck flask, adding a certain concentration NaOH solution and a grafted polymer, and dispersing the materials uniformly; and carrying out heating to react for a period of time, conducting precipitating with ethanol and washing, and ...

Synthetic method for methyl hydrogen diallyl silane

A synthetic method for methyl hydrogen diallyl silane belongs to the technical field of synthesis of high-molecular materials. Concretely, the invention provides a synthetic method for methyl hydrogen diallyl silane which is used as a monomer of a hyperbranched polycarbosilane. The method comprises: heating a mixed system of magnesium powder and THF to about 40-60 DEG C, under the protection of nitrogen, dropwise adding CH3HSiCl2 and a mixture of a certain amount of CH2CHCH2Cl (exceeding by 5-10%) and THF, controlling the dropwise adding speed and enabling the reaction to be performed under a slight-boiling state; terminating the reaction after 24 h, performing pumping filtering to remove a salt, and performing reduced-pressure distillation to remove the solvent, so as to obtain a colorless transparent liquid which is the target product.

Preparation method for flexible ethylene-octylene thermoplastic elastomer foam material

A preparation method for A flexible ethylene-octylene thermoplastic elastomer foam material belongs to the technical field of high-molecular elastomer foam materials. Concretely, the invention provides the preparation method for the flexible ethylene-octylene thermoplastic elastomer foam material which possesses a uniform closed-type pore structure. The method comprises: performing roller-packaging plasticization on POE under the condition of 60 DEG C-70 DEG C, adding TiO2, ZnO and ZnSt2 auxiliary agents, finally adding a cross-linking agent DCP and a foaming agent AC, performing open milling for 10-35 min, then discharging a sheet; and standing for 24 h, performing mold-pressing foaming, and then standing for 24 h.