37results about How to "Avoid multiple uses" patented technology

The invention discloses a preparation method of (S)-3-(4-bromophenyl)piperidine as a Niraparib intermediate. The method comprises the following steps: carrying out nucleophilic reaction via ethyl p-bromobenzoacetate and N-boc-3-aminopropyl bromide under the action of alkali, carrying out cyclization under the alkaline condition, reducing through a reducing agent to obtain 3-(4-bromophenyl)piperidine and using a chiral resolving agent to obtain (S)-3-(4-bromophenyl)piperidine. The method is short in synthetic route, high in yield, free of hydrogen and metal catalysts and relatively low in production cost, is safe and environmentally friendly, and provides technical support for further preparation of high-purity Niraparib.

The invention relates to a time-domain seismic waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation in the field of seismic data depth modeling. The method is characterized by carrying out subdivision by utilizing a variable-step-length grid in continuation depth direction; increasing calculating grid points on grid diagonals of a star convolution operator; obtaining an accurate relational expression of a wave field evolved with the time in a time-wave number domain; calculating convolution coefficients of the grid points according to wave field propagation speed of spatial points and time continuation step length to enable the error of wave number domain time evolution relationship corresponding to each point to be minimum; in the simulation space range, establishing speed indexes and calculating convolution operators corresponding to the speeds; and carrying out wave field forward simulation by utilizing the convolution operators and the speed indexes to enable error of a seismic wave field recorded in the field and a seismic wave field obtained through forward simulation to be reduced, and iteratively updating a speed model and finishing inversion. The method solves the problem of poor precision of time derivative approximate calculation caused by an existing algorithm and solves the problem of heavy wave field simulation calculation burden and low calculating efficiency.

The invention belongs to the technical field of biopesticides and in particular relates to a new azadirachtin microcapsule suspension and a preparation method and application thereof. The microcapsule suspension is characterized by comprising the following main ingredients in parts by weight: 0.1-5 parts of azadirachtin, 0.5-20 parts of organic solvent, 1-25 parts of wall material, 1-20 parts of emulsifying and dispersing agent, 0.2-6 parts of antifreezing agent, 0.01-1 part of preservative and the balance of purified water, wherein the total parts by weight are 100. The invention aims to solve the problem of environmental pollution and the problems in pest control effects caused by the deficiency of the biopesticide dosage forms in China. The microcapsule suspension has the following advantages: azadirachtin has the characteristics of lasting and stable efficacy and wide range of application; and the safety of existing azadirachtin cream during production and storage and transportation is improved.

The invention discloses a spinosad and chlopyrifos compound microsphere suspending agent and a preparation method thereof, and belongs to the technical field of pesticide production. The preparation method comprises the steps of taking spinosad and chlopyrifos as active substances, namely core materials, taking biodegradable polylactic acid as a sphere forming material, namely a wall material, dissolving the core materials and the wall material in a recoverable volatile organic solvent, preparing spinosad and chlopyrifos compound microspheres by a modified emulsification-solvent volatilization/extraction method, and preparing the spinosad and chlopyrifos compound microsphere suspending agent with stable performances with a wetting disperser, a thickener, an antifreezer, an antifoaming agent and water. In the compound microsphere suspending agent, the compounding ratio of the spinosad to the chlopyrifos has an obvious synergetic effect according to an indoor pesticide toxicity test, and as the suspending agent is wrapped by polylactic acid, the suspending agent has the advantages of safety, low toxicity, high efficiency, long lasting period, good stability and the like.

The invention discloses a biodegradable emamectin benzoate microsphere and a preparation method thereof. Emamectin benzoate serves as an active substance namely a core material, and a biodegradable material serves as a balling material namely a wall material. The biodegradable emamectin benzoate microsphere has the advantages of safety, low toxicity, high efficiency, long lasting period, high stability and the like. Compared with a conventional common high-polymer wall material microsphere, the biodegradable emamectin benzoate microsphere has the advantages of high environment compatibility and good material mechanics property; meanwhile, by changing a ratio of polylactic acid to polypropylene carbonate in the wall material, the slow release performance and the particle size of the microsphere can be regulated and controlled, the drug release performance is improved, the environmental friendliness is improved, the production cost is reduced, and requirements on pollution-free agricultural production are met.

The invention discloses a mobile phone wireless charging device with a street lamp as a carrier, and relates to the technical field of wireless charging devices. The mobile phone wireless charging device with the street lamp as the carrier solves the technical problem that a wireless charging device in the prior art has inconvenient maintenance and low popularity. The mobile phone wireless charging device includes a power source, the street lamp and a wireless charging device body. The street lamp and the wireless charging device body are connected in parallel with the power source, wherein the wireless charging device body comprises a smart manager, a power controller, a mobile phone detection and recognition module, a wireless charging transmitter, a wireless charging receiver and a codescanning terminal. A server pre-generates a two-dimensional code, a mobile phone scans and selects a wireless charging mode, the smart manager sends information to the server, the server responses and recognizes the operation and sends an instruction to a NB-IOT module of the smart manager, a control/communication circuit of the smart manager sends the instruction to the power controller, the hardware dormancy of the wireless charging transmitter is turned on, and charging is started. The mobile phone wireless charging device has a wide application range and low maintenance cost, and has wider application prospects compared with existing similar equipment.

The invention discloses a metaflumizone and chlorpyrifos mixture insecticide belonging to the agricultural chemical preparation technical field. Components and weight percentage content of the insecticide are: 0.5% to 10% of metaflumizone, 20% to 40% of chlorpyrifos, 8% to 15% of emulsifier, 5% to 15% of latent solvent, 1% to 5% of antifreeze, 0.3% to 8% of stabilizing agent, 0.2% to 4% of potentiating agent, 20% to 60% of solvent, 0.1% to 0.3% of pH value regulator. The mixture insecticide has obvious synergism when maintaining advantages of single dosage. The whole toxicity coefficient reaches 170 above. The mixture insecticide is more rapid than metaflumizone single dosage and longer than chlorpyrifos single dosage in lasting effect, which has obvious insecticidal activity for rice leafroller, pink stem borer and Chilo suppressalis. Compared with metaflumizone single dosage, the mixture insecticide has low agricultural chemical cost which reduces 30% above. The invention can be widely applied in field production and agricultural chemical manufacturing companies.

The invention discloses an automobile safe distance automatic measuring and anti-collision device based on a GPS. The device comprises a sensing part, a sensor unit, a control unit and a display and warning unit, wherein a GPS processor is adopted in the control unit, a radio receiving module (5) receives a satellite signal and is connected with the input end of the GPS processor (6), the GPS processor (6) controls the sensing part (1) to transmit a beat frequency signal to a signal processing part (2), the signal processing part (2) feeds vehicle distance information to the GPS processor (6), the sensor unit and the GPS processor (6) modify the theoretical safe distance through an input bus, an LED displayer (9) is connected with the GPS processor (6) through an output bus to display current vehicle speed and the safe distance, and a voice prompt system (8) sends out a sound warning signal.

The invention discloses a synergystic pleocidin microsphere suspending agent and a preparation method thereof. Pleocidin synergystic microspheres are prepared by taking pleocidin and piperonyl butoxide as core materials and taking biodegradable material polylactic acid as a wall material, and then the pleocidin synergystic microspheres are mixed with a wetting dispersant, aluminum-magnesium silicate being as a thickening agent, ethylene glycol being as an anti-freezing agent, an organic silicon defoamer and water so as to prepare the synergystic pleocidin microsphere suspending agent. According to the synergystic pleocidin microsphere suspending agent and the preparation method thereof, the disadvantages in the prior art are overcome, and higher biological activity can be achieved only by needing the low content of the prepared synergystic pleocidin microsphere suspending agent, and thus multiple problems in production application caused by low contents of effective components of the microsphere suspending agent are solved. The synergystic pleocidin microsphere suspending agent disclosed by the invention has a wide prevention and cure spectrum, is high in pesticide effect, high in stability, low in environmental pollution, long in lasting period, low in prevention and cure cost, and accords with the requirement on pollution-free agricultural production.

The invention relates to the technical field of official seal management, and discloses a unit official seal use management system, which comprises a main system which is connected with an applicationclient port, a principal port, a unit leader port, an official seal administrator port, scanning equipment and an official seal protection mechanism; the use method of the system comprises the following steps: applying for a client port to upload information, auditing a responsible person port of a related department, and submitting the information to a corresponding unit leader port after the information passes the auditing; after the auditing is passed, issuing an approval order number by a unit leader, or generating a two-dimensional code; and meanwhile, enabling the unit leader port to input the generated approval order number or two-dimensional code to the main system. According to the official seal management method and system, a single-approval and single-effect mode is adopted, sothat the phenomena of one-code multi-swiping and one-order multi-purpose are avoided, and the security of official seal management is improved; meanwhile, after being used, the official seal is automatically locked immediately, and the phenomenon of abuse of the official seal is avoided.

The invention discloses an N-type monocrystalline silicon HBC solar cell structure and a preparation method thereof. The cell structure comprises a monocrystalline silicon substrate, a front surface structure and a back surface structure, the front surface structure comprises a silicon nitride layer, a silicon oxide layer and an n+ type crystalline silicon layer which are arranged from top to bottom, and the back surface structure comprises two unit structures which are alternately arranged left and right. Each unit structure comprises a p+ type crystalline silicon layer, a TCO conducting film and a metal electrode which are arranged from top to bottom, the other unit structure comprises an intrinsic amorphous silicon layer, an n+ amorphous silicon layer, a TCO conducting film and a metal electrode which are arranged from top to bottom, and the thickness of the p+ type crystalline silicon layer is equal to the sum of the thickness of the intrinsic amorphous silicon layer and the thickness of the n+ amorphous silicon layer. The TCO conducting films of the two unit structures are equal in thickness and are arranged in parallel, and a gap is reserved between the TCO conducting films. The cell structure can improve the passivation effect and the antireflection effect of the front surface. The invention also discloses the preparation method of the battery structure.