612results about How to "Eliminate potential safety hazards" patented technology

The embodiment of the invention provides a voice recognition method based on a mobile terminal. The method comprises the following steps: collecting environmental sound signals; indentifying the environmental sound signals according to preset identification information; when the environmental sound signals contain special sound signals matching the preset identification information, judging whether the loudness of the special sound signals reach the preset threshold; and if so, controlling to output the special sound signals. Correspondingly, the embodiment of the invention also provides a mobile terminal. The mobile terminal of the invention utilizes the voice recognition technology, overcomes the application defects of the headset of the existing mobile terminal, eliminates the hidden danger caused by the reduced induction to the external environment sound when the user uses the headset of a mobile terminal and promotes the user experience.

The invention is a cooking utensil, a safety pressure cooker, and aims to provide a safety pressure cooker with simple and reliable structure and no explosion. The pressure cooker comprises a pot body, a pot cover, a pressure limiting valve and a sealing ring. It is characterized in that the sealing ring is connected with the elastic body, and the sealing ring moves or rotates under the action of the steam pressure in the pot, and its action is controlled by the elastic body. The elastic body is added with a preset force or a preset torque, and its value is equal to the pressure or torque of the steam on the sealing ring when the steam pressure in the pot is a safe pressure. Therefore, when the steam pressure in the pot is lower than the safety pressure, the sealing ring will not move and maintain its sealing effect. But when the steam pressure in the pot exceeds the safety pressure, the pressure or torque of the steam in the pot on the sealing ring is greater than the preset value of the elastomer, so that the sealing ring moves or rotates, and a gap is formed between the sealing ring and the pot body and cover. The steam releases and the steam pressure decreases. The safety device has the advantages of simple structure, stability and reliability, and can effectively eliminate potential safety hazards of the pressure cooker.

The invention discloses a physical similar simulation test device and a physical similar simulation test method for tilted stratums. The physical similar simulation test device comprises an external framework, a tiltable rack, a front baffle, a rear baffle, a hydraulic supporting device and a hanging hoisting device, a similar simulation test is performed on stratums with different tilt angles by adopting the device and the method, physical mechanical performances of stress distribution, displacement change and the like inside the stratums under the action of external disturbance, ground stress, external force application and the like can be measured to obtain related technical indexes and parameters so as to research the rule of the true stratums in the process, and the effective struts can be facilitated during the construction of the stratums, thus providing a guarantee for the safety construction of the stratums.

The invention provides a drying method of pole pieces of a lithium-ion secondary battery, which comprises the following steps of: respectively drying an anode coil stock and a cathode coil stock; placing the coil stocks into a pallet in a drying box; vacuumizing the drying box to -0.1MPa, then continuously vacuumizing for 1-30 minutes, and closing; heating the drying box by utilizing a heater; filling inert gas into the drying box after 2-10 hours, and stopping until the pointer of a vacuum meter reaches -0.01MPa; exchanging the inert gas with moisture in the drying box for 5-30 minutes, vacuumizing the drying box to -0.1MPa, then continuously vacuumizing for 1-30 minutes, and closing; and closing the heater, and taking the coil stocks out of the drying box to be rolled after the temperature drops to the indoor temperature. The drying method provided by the invention can be used for completely eliminating the moisture in the coil stocks of the pole pieces, thereby improving the performance of the battery and eliminating the potential safety hazards caused by the ballooning of the battery.

The invention discloses a living body human face identifying method. The method is divided into a training stage and an identifying stage. In the training stage, multiple living body human face images and picture human face images are obtained, the feature vector of a gray level image of each living body human face image is extracted to serve as a positive sample, and the feature vector of a gray level image of the human face image of each picture is extracted to serve as a negative sample, all the positive samples and all the negative samples are input into an SVM classifier to be trained, and an SVM classifier training model is obtained; one frame human face image is obtained in the identifying stage, the human face identifying technology is used for identification, when an identification result shows that a user is legal, the living body detection technology is used for extracting the feature vectors, and the feature vectors are input into the SVM classifier training model to conduct living body detection. The living body human face identifying method has the advantages that the human face identifying technology is used for judging whether the human face is the human face of the legal user or not, the legal user then can judge whether the human face is a living body human face or a counterfeit picture human face through the living body detection technology if the user is legal, and therefore potential safety hazards caused by the picture human face are effectively eliminated.

A method and apparatus for quantum key distribution comprised of a privacy amplification method and device for the quantum key distribution process as well as a data transmission method and system based on quantum keys is provided, wherein the quantum key distribution method includes the following process: obtaining a bit stream of the same basis vector by sending or receiving coding quantum states of random bit streams and comparing those measurements obtained with the measurement basis vector; in accordance with a preset manner, extracting parameter information associated with privacy amplification and initial key information from the bit stream of the same basis vector after error correction; and using the initial key as an input to implement the privacy amplification algorithm based on the parameter information and thereby obtain shared quantum keys. Utilization of the method detailed herein can eliminate security risks in the negotiation of privacy amplification parameters in the alternative channel and effectively improve the security of quantum key distribution processes.

A multi-functional temperature controlling intelligent electronic cigarette, having a main body, a tobacco toasting atomizer, a PCB, and a threaded port and two annular metal gaskets having different radii at an upper end of the main body; the two gaskets are connected to output ends of a positive pole and a negative pole of the PCB respectively; a tobacco toasting container is provided inside the atomizer; a heat sensitive resistor is connected onto the container; the atomizer is provided with a threaded connector whose two outer sides are each provided with a spring loaded pin; the two pins are different in their distances from the threaded connector; the two spring loaded pins are connected to a positive pole and a negative pole of the heat sensitive resistor respectively; when the main body is connected to the atomizer, the two pins are connected with the two gaskets respectively.

The invention relates to a method and device for detecting internal pressure of a lithium ion cell, which are characterized in that: formula (P0*V0=P1*(V0+deltaV), temperature is constant) is enacted on the basis of Boyle law, wherein P0 is internal gas pressure of the cell, V0 is volume of internal gas of the cell under pressure P0, P1 is atmospheric pressure, and deltaV is change quantity of internal gas volume of the cell under atmospheric pressure. The detecting method includes steps: 1. measuring the change quantity deltaV of the internal gas volume of the cell; 2. measuring the internal gas volume V0 of the cell; 3. calculating the internal gas pressure P0 of the cell. A device for detecting deltaV is constituted of a gas discharge pipeline with a cell clip, a gas transmission pipe, a glass burette with scale, a three-valve rubber pipette bulb, a water tank and an iron support. The method and the device realize real time, effective and accurate measurement for internal pressure of the cell, instruct improvement of cell body structure and safety valve design, and ensure elimination of safety hidden trouble.

The invention discloses an intelligent charging method and device for a battery management system of an electric vehicle. A microcontroller is connected with communication interfaces of a whole vehicle controller, the battery management system and a vehicle-mounted charger, messages relevant to charging information are read, charging parameters are regulated, a communication module informs the charging information to the battery management system and the vehicle-mounted charger, and after information feedback from the battery management system and the vehicle-mounted charger is received, a charging command is sent to the vehicle-mounted charger through the communication module; after receiving the charging command, the vehicle-mounted charger charges a power battery after converting the input alternate current into high-voltage direct current; and the microcontroller displays the charging information to a driver in real time through a man-machine interaction unit and regulates the charging strategy. The charging current and charging voltage of the vehicle-mounted charger can be regulated automatically according to the charging information sent by the whole vehicle controller, the current residual volume of the battery management system and other information, and the driver is prompted through a man-machine interaction interface, thereby avoiding the damage to the battery in a blindly charging state due to overcharging, eliminating potential safety hazards caused by overcharging batteries, ensuring life safety and avoiding economic loss.

The invention discloses a method for controlling tire burst of an automobile. The method deals with tire burst accidents occurring under straight travel condition and tire burst accidents occurring under cornering travel condition by reasonably starting ABS brake operation or ESP brake operation, such that not only extra hardware devices are not needed to add, but also the original braking force system is not needed to change, and service efficiency of the control device of the original automobile is further improved, so the method is convenient to implement. Both the ABS brake operation and ESP brake operation can help the driver to control the direction; therefore, the driver can control traveling direction of the automobile well in the event of tire burst of the automobile. At the same time, pretightening security protection of a pretightened safety belt and a forwarded headrest can greatly increase the degree of security protection to the driver, such that traveling safety of the automobile is higher.

The invention is suitable for the technical field of mobile terminals and provides a method and device for encrypting and decrypting an application program. The method comprises the steps as follows: obtaining an application program installation package comprising an encrypted installation file, a mobile terminal identifier and a key; obtaining the mobile terminal identifier; and when the obtained mobile terminal identifier is the same as that in a key file, decrypting the encrypted installation file in the application program installation package according to the preset algorithm and the key. According to the embodiment of the invention, the encrypted installation file in the application program installation package is decrypted according to the preset algorithm and the key only when the obtained mobile terminal identifier is the same as that in the key file, so that the problem of arbitrary transmission of the application program is solved, the customizers and the fee collectors of the application program are prevented from suffering a loss, and the potential safety hazard caused by arbitrary transmission of the application program is avoided.

The invention discloses a road junction driving auxiliary device for a motor vehicle. The road junction driving auxiliary device comprises an identification unit, a distance measuring unit, a speed measuring unit, a central processing unit and an early warning prompting unit, wherein the identification unit is used for collecting information of images in front of the motor vehicle in real time and analyzing and identifying the information, as well as sending related information to the central processing unit when a traffic light and a stop line at a road junction are identified; the distance measuring unit and the speed measuring unit are respectively used for sensing real-time speed of the motor vehicle and a distance between the motor vehicle and the stop line, and feeding the measured data back to the central processing unit; the central processing unit is used for calculating so as to judge whether the motor vehicle can safely pass the road junction or not according to the received data and image information, and corresponding voice prompt can be given by the early warning prompting unit. According to the device, the problem that a driver can not accurately judge whether the motor vehicle can safely pass the road junction or not is solved, and a good human-computer interface is provided, so that the burden of the driver is reduced, the driving safety is improved, and the transportation is facilitated.

The invention discloses a system and method for supervising maintenance of an elevator device. The system comprises a human-computer interaction device, a data acquisition device, a wireless data transmission device and a remote monitoring platform, wherein the human-computer interaction device comprises an identity recognition device and a storage device; and the remote monitoring platform comprises a database server. The method comprises the following steps of recognizing identities of maintenance personnel or annual survey personnel; recording maintenance operation into maintenance record or annual survey record; and storing the maintenance record or the annual survey record into the storage device and the remote monitoring platform on the elevator device. By recognizing the identities of maintenance personnel or annual survey personnel and storing the maintenance record or the annual survey record into the storage device and the remote monitoring platform on the elevator device, effective supervision on the maintenance operation can be performed, potential safety hazards of the elevator device can be eliminated timely, and life security of people taking the elevator device is ensured.

The invention discloses a truss type hydraulic folding and conveying device for ships. The truss type hydraulic folding and conveying device for ships comprises a fixing rack, a belt conveying mechanism and a foldable truss type conveying arm mechanism, wherein the belt conveying mechanism is arranged in the truss type conveying arm mechanism, the truss type conveying arm mechanism comprises a first conveying arm and a second conveying arm, the first conveying arm is connected with the fixing rack in a folding mode, the second conveying arm and the first conveying arm are connected in a folding mode, the fixing rack is provided with a security portal frame and a wire rope winding mechanism, the bottom of the security portal frame is connected to the fixing rack in a rotatable mode, the security portal frame is automatically erected or folded along with unfolding or folding of the first conveying arm, a foldable supporting connection rod is hinged between the lower portion of the security portal frame and the fixing rack, the maximum erecting angle B of the security portal frame is smaller than 90 degrees when the supporting connection rod is completely unfolded, and a wire rope is connected to the front end and the middle of the first conveying arm through an idler wheel at the top of the security portal frame. The truss type hydraulic folding and conveying device for ships has the advantages of being low in cost, high in safety, operability and navigation capacity and low in safety accident rate.

The invention discloses a fault diagnosis and safety pre-warning oriented elevator monitoring system and method. A cloud-side processing module is used for receiving data of all machine room board modules and camera modules in multiple elevator cars and achieving the computation and storage functions. The machine room board modules control data of the multiple elevator cars, achieve the computation and temporary storage functions and transmit computation results to the cloud-side module. Elevator car ceiling board modules collect data of the corresponding single elevator cars, transmit the data to elevator car ceilings in an I2C mode to be processed and transmit processing results to the machine room board modules. Elevator car door board modules are used for collecting data of barometer sensors and three-axis acceleration sensors mounted nearby elevator car doors, conducts filtering, integration and vibration analysis on the data and transmit processing results to the corresponding elevator car ceiling board modules for being processed. The fault diagnosis and safety pre-warning oriented elevator monitoring system achieves the real-time monitoring analysis effect through layer-by-layer grading and function decoupling of all the modules and meanwhile improves the elevator running state monitoring and fault pre-warning accuracy.

The embodiment of the invention discloses an authentication method, a server, and a terminal. The authentication method comprises: when an identity authentication request sent by a terminal is received, a verification code is sent to the terminal, wherein the verification code is obtained by encrypting source verification information by using pre-stored valid user biological feature information; a to-be-checked code inputted by the terminal based on the verification code and biological feature information, inputted by the terminal, of a to-be-authenticated user are received; the inputted to-be-checked code is decrypted by using the biological feature information of the to-be-authenticated user to obtain target verification information; and the target verification information and the source verification information are compared and an identity authentication result of the to-be-authenticated user is determined based on the comparison result. According to the embodiment of the invention, on the basis encryption and decryption on the verification code, security is improved and the identity of the user can be confirmed conveniently and accurately.

The invention discloses a multi-source information fusion vehicle-mounted child safety auxiliary system. The multi-source information fusion vehicle-mounted child safety auxiliary system comprises a vehicle-mounted power source management terminal, a vehicle-mounted environment parameter acquiring terminal, a vehicle-mounted executing terminal and a mobile phone terminal; the vehicle-mounted powersource management terminal comprises an automobile state detecting module, a power source switching module, a power module and a solar power generating module; the vehicle-mounted environment parameter acquiring terminal comprises an infrared camera module, an oxygen concentration measuring module, a carbon dioxide concentration measuring module, a temperature and humidity measuring module and aGPS positioning module; the vehicle-mounted executing terminal comprises an air conditioning module, a GSM communication module and an alarming module; and the mobile phone terminal comprises a mobilephone client. According to the multi-source information fusion vehicle-mounted child safety auxiliary system, three parameters of an actual condition image, oxygen concentration and carbon dioxide concentration in a vehicle are comprehensively measured, whether a child is trapped in the vehicle or not is judged, and higher safety and reliability are achieved; and by means of an air conditioner system in the vehicle, air conditioning is performed in time, the safety of the child being trapped in the vehicle is guaranteed, the automobile is made safer and more reliable, and the potential safetyhazards are effectively eliminated.

The invention relates to an air-to-air cooling double-fed asynchronous wind driven generator, in particular relates to an air-to-air cooling double-fed asynchronous wind driven generator with a good heat radiation effect. With the adoption of the air-to-air cooling double-fed asynchronous wind driven generator disclosed by the invention, the problem that the conventional double-fed asynchronous wind driven generator has poor ventilation and a heat radiation effect of a motor due to an unreasonable structure can be solved. The air-to-air cooling double-fed asynchronous wind driven generator comprises an engine seat, a rotating shaft, a stator, a rotor and an air-to-air cooler. An axial ventilation channel is arranged on the rotating shaft; a radial rotor air vent is arranged on a rotor iron core; a radial stator air vent is arranged on a stator iron core; a baffle is fixedly arranged in the axial ventilation channel; the left end of the rotating shaft is fixedly connected with a left centrifugal fan, and the right end of the rotating shaft is fixedly connected with a right centrifugal fan; and a rotor winding connection wire end is located at the right side of a fixed rotor, and a stator winding connection wire end is located at the right side of the fixed rotor. The generator disclosed by the invention is in a ventilation structure and has the good heat radiation effect. The ventilation structure of the air-to-air cooling double-fed asynchronous wind driven generator can be widely applied to double-fed asynchronous wind driven generators.

The invention provides a large-sized DC hollow electrode sealing submerged-arc furnace which solves the technical problems that the prior DC electric arc furnace can not applied to the submerged-arc furnace, the AC sealing submerged-arc furnace has high electricity consumption, great electrode consumption and low security. The technical proposal is as follows: the submerged-arc furnace comprises a DC power supply, a furnace body, a furnace cover, at least three hollow electrodes arranged inside the furnace body, an electrode lifting system, a self-control system, a cathode water-cooling cable for connecting the hollow electrodes and the DC power supply and an anode water-cooling cable for connecting the furnace body and the DC power supply, wherein, the hollow electrodes are distributed in a circle and pass through the furnace cover; a powder material transmission system is communicated with the hollow electrodes. The large-sized DC hollow electrode sealing submerged-arc furnace has the advantages of high security, high product quality, the increased output and low consumption.

A lift frame for assembling engine is composed of a ground pit, a lift mechanism installed in said ground pit and consisting of lift platform, base, motor, gear box, worm-gear mechanism, screw bolt and nut, and an assembling frame on said lift platform.

The invention discloses a method for automatically checking the protection functions of a microcomputer main-transformer differential protection device. The method includes the steps of starting a checking mode, shutting external alternating current sampling, reading a protection control word and a protection control definite value, starting to test an item of a test, judging whether protection is input or not, shutting other protection functions, generating a test sequence according to the definite value, carrying out alternating current input assignment, judging whether the protection acts or not, recording action values and action evaluation, releasing protection function shutting, judging whether the test is completed or not, generating a function checking report, printing the function checking report, exiting from the checking mode, starting external alternating current sampling and the like. By means of the method, extra hardware cost and extra outside loop wiring are not needed, testing of the various protection functions of the whole device can be completed without manual intervention and protection for a tester, the testing process and the testing result are dynamically displayed in real time, and the test report is automatically generated. Due to the automatic checking technology, device test items are standardized, and technical errors, such as test item missing, testing method mistaking and testing result misjudgment, caused by the capacity of workers are avoided.

The invention provides a ventilation cabinet. The ventilation cabinet can comprise a cabinet body 100 with an opening 101 formed in the front side, and can further comprise an air exhausting port 201, an air supplementing channel 301 and a flow guiding plate 400, wherein the air exhausting port 201 is installed on the side, close to the rear, of the top of the cabinet body 100; the air supplementing channel 301 can comprise an air supplementing port 302; the air supplementing port 302 is installed on the lower edge of the opening 101 of the cabinet body; and the flow guiding plate 400 is erected on the rear side of an inner cavity of the cabinet body 100, and is provided with a plurality of through holes 401. Besides, the side wall of the cabinet body 100 is of a hollow structure, and the air supplementing channel 301 is communicated with an air supplementing inlet 303 and the air supplementing port 302 along the side wall. The ventilation cabinet can eliminate potential safety hazards, harmful gas in the cabinet is prevented from overflowing, and meanwhile the ventilation cabinet further has the beneficial effects of being simple in structure and low in manufacturing cost.

The invention provides a monitoring method of a power battery. The method includes the following steps that whether an electric automobile is in a flameout parking state or not is judged; if the electric automobile is in the flameout parking state, an automobile-mounted terminal is controlled to enter in a dormant state, and a timing module starts to conduct timing; when the timed time reaches first preset time, the automobile-mounted terminal and a battery management system are awakened to enter in a working state, and the timing module is controlled to restart conducting timing; the batterymanagement system enters in the working state, starts to monitor battery state information of the power battery and sends the battery state information to a monitoring platform through a communicationmodule; and when the re-timed time reaches second preset time, the battery management system is controlled to stop working and enter in a dormant state, and whether the electric automobile is in theflameout parking state or not is judged again. By the adoption of the provided monitoring method of the power battery, potential safety hazards of the power battery in the flameout parking state of the automobile can be eliminated. The invention further provides the electric automobile.

The invention discloses an implementing method for carrying out alarming on the abnormal temperature inside a mobile phone, which comprises the following steps of: 1, after the mobile phone is started, entering a program; 2, detecting the temperature inside the mobile phone and recording a current temperature sampled value T; 3, judging whether the T value is valid, executing the step 4 if yes, or judging that the temperature detection is abnormal, prompting an alarm ring tone or vibrating and displaying that the temperature is wrong on a display screen; 4, comparing the current temperature value T with a normal use temperature range of t1 to t2, in which a system acquiesces, and judging a state of the temperature inside the mobile phone; 5, when the T is less than t1, judging the state into the low temperature abnormity, and when the T is greater than t2, judging the state into the high temperature abnormity, and prompting the alarm ring tone or vibrating; 6, prompting a user to process the current temperature abnormal state, prompting the user to take away the mobile phone from the low temperature environment in the low temperature abnormality state, and prompting the user to take away the mobile phone from the high temperature environment or pause using the mobile phone in the high temperature abnormality state; 7, displaying the real-time temperature value T in a temperature display directory in the system so that the user can view the temperature; and 8, finishing the program. The implementing method has simple structure and is safe and practical.

The invention discloses a virtual reality spectacle case system and a reminding method thereof. The system comprises a mobile terminal and a virtual reality spectacle case used for containing the mobile terminal, wherein a position, which corresponds to a back camera of the mobile terminal, on the front end of the virtual reality spectacle case is provided with an opening; the mobile terminal is provided with an image recognizer, a processing module and a reminding module; the image recognizer is used for recognizing an image shot by the back camera; the processing module is used for judging whether reminding needs to be carried out according to a recognition result; and the reminding module is used for emitting prompt information to remind a user. Through the system, when the user uses the virtual reality spectacle case to watch videos in a walking process, the camera is started to shoot and recognize a front image, and the system reminds the user when front ground is uneven and/ or an obstacle appears so as to eliminate potential safety hazards.

The invention provides a device and method for monitoring the neutral point earthing of a secondary winding of an electric power current and voltage mutual inductor. The device comprises a detection amplification module, a judgement processing module, a control circuit and an alarming circuit, wherein the detection amplification module is used for detecting and amplifying a current in the neutralpoint earthing wire of the secondary winding of an electric power current and voltage mutual inductor; the judgement processing module is used for judging whether the amplified current reaches an alarming current threshold value; if the amplified current reaches the alarming current threshold value, a control circuit switch is triggered to be closed; the control circuit comprises the control circuit switch and an alarm starting unit, the control circuit is conducted when the control circuit switch is closed, and the alarm starting unit triggers an alarming circuit switch to be closed; the alarming circuit comprises the alarming circuit switch and an alarm indicator light; and when the alarming circuit switch is closed, the alarming circuit is conducted, and the alarm indicator light is lightened. According to the device and the method provided by the invention, the neutral point earthing condition of the secondary winding of an electric power current and voltage mutual inductor can bemonitored in real time, the device gives out an alarm in time if multiple-point earthing is found, and maintenance staff are notified to process the earthing condition, thereby the potential safety hazard is eliminated.

The invention provides a resource mine repairing method. The method comprises the steps that a tailing resource in a tailing pond and/or a mineral resource of a rock stripping area or a dumping site are subjected to valuable element extraction; if tailings produced from the valuable element extraction procedure of the tailing resource and/or the mineral resource without the extracting value are suitable for deep processing, deep processing is conducted, and a target product is obtained; if the tailings are not suitable for deep processing, and a goaf or a subsidence area is filled with the tailings; harmless processing is conducted on occupied land of the rock stripping area or the dumping site and/or an industrial site; ecological restoration is conducted on the occupied land of the rock stripping area or the dumping site and/or the industrial site which is subjected to harmless processing and the goaf or the subsidence area subjected to filling. According to the resource mine repairing method, maximization of repaired land value is achieved, tailing-free, harm-free, hidden danger-free and all green repairing effects of a mine are achieved, the processing cost is low, and the economic benefit is good.

The invention discloses a visual positioning method of a large-size material and a carrying robot, and relates to the technical field of machine vision. The visual positioning method comprises the following steps of acquiring a depth image of a material through a depth camera; carrying out analyzing to obtain coordinates of each point on the depth image in a three-dimensional coordinate system; and identifying a material plane according to the coordinates of all points, and calculating the center coordinates of the plane of the material. The depth image of the material is acquired at the viewing angle of the carrying robot through the depth camera, the plane of the material can be identified through image processing and analysis, and the coordinates of the geometric center of the materialin the three-dimensional coordinate system can be calculated, so that visual guidance is provided for the carrying robot, the carrying robot can grab the material according to the center point of thematerial, and the material is guaranteed to be uniformly stressed, balanced and the like in the carrying process. In this way, the carrying robot can be free of the auxiliary of constructors, materialconveying is independently completed, and potential safety hazards are eliminated.

The invention relates to a nanometer boehmite and a preparation method thereof. The nanometer boehmite is characterized by comprising the following components by weight: 50-150 parts of pseudo-boehmite, 1-10 parts of inorganic acid or inorganic base, 0.5-3 parts of additive and 400-750 parts of deionized water. The preparation method comprises the following steps: (1) dispersing pseudo-boehmite powder to the deionized water, adding the inorganic acid or the inorganic base for uniformly stirring; (2) adding the special additive and uniformly stirring to obtain feed liquid; (3) adding the feed liquid to a high-pressure reaction kettle for hydrothermal reaction; and (4) discharging after cooling, and spraying fog to obtain the nanometer boehmite after washing. By utilizing the preparation method, the nanometer boehmite with different morphologies can be prepared by taking the pseudo-boehmite as a starting material, the use of a large number of strong acid and alkali usage is avoided, a potential safety hazard is eliminated, the washing water consumption is reduced, the cost is saved, and the preparation method is conducive to energy conversation and environmental protection and can be used in different application occasions.

The invention relates to an indoor worker off-duty detection method based on a video monitoring platform. The method includes processing a video subjected to pre-processing treatment by using an inter-frame difference method so as to acquire differential images of each two frames; defining a state machine and implementing dynamic switch among four states specifically including an off-duty state, asuspected on-duty state, suspected off-duty state and an on-duty state; judging the state of an operator on duty according to mean value of the differential images, entering the state machine if themean value of the differential images is not greater than 200, and holding the original state when the mean value of the differential images is greater than 200, in order to eliminate interference caused by photographing luminance surge in monitoring video; performing state machine parameter initiation, defining an off-duty timer and a variable, and changing the state variable and the off-duty timer according to the staff on-duty state information obtained through state machine switch.