Metal oxide catalyst for synthesizing methyl carbonate by urea process and its prepn

The metal oxide catalyst for urea alcoholysis process of synthesizing methyl carbonate consists of 1-3 kinds oxides of Li, Mg, Ni, Zn, Pb, Al, Fe, Mo, Zr and La, and has ZnO as main component accounting for 35-95 wt%. When it consists of three kinds of metal oxide, the other two except ZnO have the same weight percentage. It is prepared through thermal decomposition process, precipitation process, or coprecipitation process. The catalyst is easy to prepare, separate, recover and regenerate, and has high catalytic activity for urea alcoholysis process of synthesizing methyl carbonate, yield upto 49.7%, no corrosion of equipment and no environmental pollution.

Roller and workpiece measuring device

The invention discloses a roller and a workpiece measuring device. A support is fixed on the upper front part of a grinding frame by a screw; a hydraulic motor is connected with a rotating shaft and is arranged on a support; a rotating support is connected with the rotating shaft by a key; a compressing grating scale is mounted on a mounting plate; a swinging rod is positioned on the front end of the mounting plate by a bearing and a gland; the mounting plate is fixed on the side face of the rotating supporting by a screw; when the devices works, the hydraulic motor drives the rotating support to turn down to align the measuring head and the center of a grinding wheel, the grinding frame moves toward to the workpiece or roller, the measuring head contacts the workpiece, the swinging rod rotates to compress the grating scale for reading, the workpiece move reciprocally for measurement, the hydraulic motor rotates backward at the end of the measurement, the rotating support turns upward to ...

Submarine optical cable searching and grabbing device and control method

The invention belongs to the technical field of submarine optical cables, and provides a submarine optical cable searching and grabbing device and a control method. The submarine optical cable searching and grabbing device comprises an overwater device and an underwater device, the overwater device and the underwater device realize power supply connection and network connection through a cable and an optical cable, and the overwater device comprises a power supply, a display, a control module, a communication module, a seagoing ship positioning module and a vibration detector. The underwater equipment comprises an underwater positioning module, a seabed scouring module, an optical cable grabbing module, a vibration signal generator and an underwater walking device. Through cooperation of the vibration signal generator and the vibration detectors, two breakpoints of the broken submarine optical cable can be accurately found through the vibration detectors at the two ends of the submarine ...

Metal oxide catalyst for synthesizing method carbonate by urea process and its prepn

Multifunctional torque sensing arm rehabilitation device for rehabilitation robot

Method for detecting and distinguishing orthopoxvirus for non-diagnostic purpose, device and application thereof

The invention provides a non-diagnostic method for detecting and distinguishing orthopoxvirus, a detection device and application thereof. In order to further detect the sensitivity of the method, digital PCR is further used for determining the lowest detection limit. The lowest detection limits of the three channels are reduced to 0.484 copy number/[mu] L, 0.352 copy number/[mu] L and 0.352 copy number/[mu] L from 119 copy number/[mu] L, 183 copy number/[mu] L and 8.6 * 10 < 3 > PFU/mL of fluorescent quantitative PCR, and the detection sensitivity of the method is greatly improved. And the detection specificity of the invention is verified by using a digital PCR method again.

Primer probe set and kit for detecting monkey pox virus B.1 line and application

The invention provides a primer probe set for detecting monkey pox virus B.1 line, a kit and application, and relates to the technical field of biological medicine. The invention provides a primer probe group for detecting the monkey pox virus B.1 line, which not only can realize the detection of the monkey pox virus B.1 line by simultaneously utilizing a multiple fluorescent quantitative PCR (Polymerase Chain Reaction) method and a digital PCR method, but also has higher specificity and sensitivity. Tests prove that the monkey pox virus cladeII can be rapidly and specifically detected by utilizing the primer probe group, and the monkey pox virus B.1 line can be distinguished from other lines, so that a foundation is laid for developing a monkey pox virus branch specific detection kit, and the primer probe group has important development value and popularization significance.

Polyvinylidene fluoride/liquid crystal blending microporous membrane and preparation method thereof

The invention discloses a polyvinylidene fluoride/liquid crystal blending microporous membrane and a preparation method thereof. The microporous membrane comprises the following components by mass percentage (wt%):10-30% of polyvinylidene fluoride, 0.4-4% of macromolecule lyotropic liquid crystal, 56-88.6% of organic solvent and 1-10% of additive. The preparation method comprises the following components of the microporous membrane by mass percentage (wt%) and the following steps: (1) 25-27% of cyanoethyl cellulose or cyanoethyl-ethyl cellulose is dissolved into 25-75% of N,N-dimethyl fomamide, N,N-dimethyl acetamide, N,N-dimethyl sulfoxide, glacial acetic acid or crylic acid, is put in constant temperature of 50 DEG C for 12 hours, and is stood for 72 hours at room temperature to form lyotropic liquid crystal; (2) microporous membrane components are weighted; (3) the organic solvent, polyvinylidene fluoride and additive are evenly mixed, and then the lyotropic liquid crystal is added to ...

Myoelectricity artificial hand grip strength controlling method based on fuzzy controller

The invention discloses a myoelectricity artificial hand grip strength controlling method based on a fuzzy controller, which comprises the following steps of: 1, acquiring signals of muscle action force by using a myoelectricity electrode, and acquiring signals of artificial hand grip strength by using a force touch sensor; 2, pre-treating the acquired signals of the muscle action force and the acquired signals of the artificial hand grip strength and performing fuzzification; and 3, performing fuzzy reasoning on the obtained fuzzification output results by using a fuzzy rule, and finally performing de-fuzzification on the result of the fuzzy reasoning, obtaining a driving signal to control the myoelectricity artificial hand grip strength.

Lifting device is transplanted to trees

The utility model provides a lifting device is transplanted to trees, characterized by: lifting device is transplanted to trees includes that casing, one end and casing rotate and is connected the other end and casing slided and is connected hold the belt tightly, restrict the locking device that holds belt one -way sliding in the casing tightly, relieve locking device to the unlocking device thatholds the belt tightly and lock and the fixed connection suspender the casing on one side of. The utility model has the advantages that: the use has the belt of holding tightly of certain width and bindes the trunk, because the belt texture is soft, thus the damage that meeting greatly reduced caused the bark when hoisting trees, and locking device can lock the belt to guaranteeing to hold the belt tightly and can embrace the trunk in the back of hoisting trees, avoiding the trunk to drop, cause the accident, unlocking device can relieve the locking of locking device to holding the belt tightly ...

Behavior data learning style portrait generation method, system, device and medium

The invention discloses a behavior data learning style portrait generation method, system and device, and a medium. The method comprises the steps of obtaining sample data, constructing a convolutional neural network model, processing first behavior data, and obtaining cognitive emotion state recognition data; constructing a Transform model with spatial and temporal feature fusion, and processing the second behavior data to obtain cognitive concentration identification data; constructing a semantic recognition model, and processing the third behavior data to obtain interaction activeness recognition data; quantifying the cognitive emotional state recognition data, the cognitive concentration recognition data and the interactive activeness recognition data to generate a behavior data sequence, constructing a learning style coding framework, generating a learning style portrait according to the behavior data sequence, and generating a learning style picture according to the learning style ...

Deaf-mute sign language error correction method and device based on machine learning and medium

The invention discloses a deaf-mute sign language error correction method and device based on machine learning, and a medium, and the method comprises the steps: obtaining sign language body language video data, building a manual statement method corpus and a manual statement method error detection model, carrying out the error detection and error correction of text data error information, improving the feature accuracy of a sign language image, and improving the recognition accuracy of the sign language image. By establishing cross-modal unified representation of text data and sign language and body language video data, cross-modal confrontation training is performed on the text data after error correction, feedback video data is generated, a cross-modal heterogeneity gap existing between a video and a text is eliminated, and the feedback video data is obtained. A sign language video sample with a syntactic error can be converted into a corrected teaching feedback animation, a deaf-mute ...

Processing method capable of maintaining normal color of duck meat and improving fresh and tender taste of duck meat

The invention discloses a processing method capable of maintaining the normal color of duck meat and improving fresh and tender taste of duck meat. To overcome the disadvantages of incapability of maintaining the natural color and fresh and tender taste of duck meat, poor palatability of artificial seasoning, non-accordance with the tendency of environmental protection and naturalness, influence on processing benefits of duck meat and the like of conventional processing methods, the processing method provided by the invention adopts a step of smearing honey on duck meat before frying of the duck meat and a step of frying the honey-processed duck meat in pure rapeseed oil with a temperature of 150 DEG C for 7 to 8 min. The processing method provided by the invention is used for processing of duck meat, is environment friendly, has low cost, can maintain the unique natural color of duck meat, improve fresh and tender taste of duck meat and maintain nature flavor of duck meat, enables palatability ...

Hand motion intention recognition method based on electromyographic signal multi-layer feature extraction

The invention discloses a hand motion intention recognition method based on electromyographic signal multilayer feature extraction. The method comprises the following steps: acquiring multiple paths of electromyographic signals on an arm and a corresponding hand motion A during hand motion; performing multi-layer feature extraction on the multiple paths of electromyographic signals, updating the time domain amplitude range of the electromyographic signals in real time, and extracting the signal zero crossing point number meeting the intensity requirement in a layered manner according to the time domain intensity of the electromyographic signals to obtain feature data; and training the feature data and the corresponding hand movement to obtain a prediction model. The extracted multi-layer features provide frequency information of the electromyographic signals under different signal intensities, and the accuracy of hand motion intention recognition is improved.

Portable marble cutter with dust removal heat sink

The utility model provides a portable marble cutter with dust removal heat sink, includes that motor and fixed connection at the saw bit of motor dynamic output, include the dust removal heat sink, the pressure device of dust removal heat sink filling gas body in including the fixed water tank that sets up on the motor, to the water tank, with the aqueduct of the direction of the water in water tank saw bit, with the spun water supply switch whether of the water in water atomization spun atomizer and the control water tank, the atomizer is towards the saw bit. The utility model has the advantages that: added the dust removal heat sink on portable marble cutter, the watering that can atomize of dust removal heat sink has purified user's operational environment, and the cooling has thoroughly avoided the saw bit to work for a long time, produces high temperature and damages self, has improved the life of saw bit greatly, and setting up of water tank and pressure device can let portable marble ...

Arm rehabilitation training device

The invention discloses an arm rehabilitation training device which comprises a bottom plate and an arc-shaped sliding rail which is installed on the bottom plate and forms a training route, an arc-shaped sliding block is installed on the arc-shaped sliding rail in a sliding mode, a damping adjusting mechanism is arranged on the arc-shaped sliding block, and the damping adjusting mechanism regulates and controls the sliding resistance of the arc-shaped sliding block and can regulate and control the sliding resistance of the arc-shaped sliding block. The driving mechanism comprises an adjusting part and a driving part, the adjusting part is used for controlling the driving part to be in a working position or an idle position and can switch training modes, when the adjusting part is in the working position, the driving part drives an arc-shaped sliding block to move so as to drive the arm of a patient to reciprocate along an arc-shaped sliding rail, and when the driving part is in the idle ...

Processing method for deodorizing duck meat and retaining nutrients and fresh and tender taste of duck meat

The invention discloses a processing method for deodorizing duck meat and retaining nutrients and fresh and tender taste of duck meat. To overcome the disadvantages of difficulty in thorough deodorization of duck meat, great loss of nutrients and fresh and tender taste, complex process, high treating cost, easy generation of new chemical pollution, high processing cost and the like in the prior art, the processing method provided by the invention adopts a first step of putting duck meat into a steaming device for steaming at a pressure of 2 Pa and a temperature of 80 DEG C for 18 to 22 min, a second step of smearing honey on steamed duck meat and frying steamed duck meat with honey in pure rapeseed oil with a temperature of 150 DEG C for 7 to 8 min and a third step of adding needed conventional seasonings into fried duck meat and carrying out frying. The processing method is used for duck meat processing, can well deodorize duck meat, maintain the unique color and the unique fragrance of ...

Dual wavelength laser component for optical fiber communication

The invention provides a dual wavelength laser component for optical fiber communication, which comprises a close cover, a base matched with the close cover to form an accommodating space, a first laser chip and a second laser chip, wherein the first laser chip and the second laser chip are arranged on the base and positioned in the accommodating space; the close cover comprises a cover body and alens embedded on the cover body; the first laser chip emits out a first laser beam toward the lens; the second laser chip emits out a second laser beam toward the lens; and the dual wavelength lasercomponent capable of emitting two laser beams with different wavelengths can be obtained by commonly arranging the first laser chip and the second laser chip with different wavelengths in the accommodating space formed by the base and the close cover.

Intelligent teaching ecosystem based on big data

The invention discloses an intelligent teaching ecosystem based on big data, and the system achieves the teaching interaction function, the resource sharing function, the mobile learning function and the construction of a teaching portal through a teaching interaction platform and a school management platform, and achieves the purposes that a teacher can carry out the course construction, teaching monitoring and resource sharing, and students can carry out the autonomous learning. And integration of all data is realized, and a network teaching center which is advanced in concept, advanced in technology and outstanding in characteristics is finally constructed. Through the collection and operation mechanism of big data, a platform is established, so that teachers can be effectively promoted to timely discover problems existing in a teaching process and an education management process, carry out comprehensive analysis and find out a solution method. Data in various aspects in teacher and ...

Multi-point haptic representation method and system based on Halbach array

The invention discloses a multi-point haptic representation method and system based on a Halbach array. According to the method, a three-dimensional background electromagnet is excited to generate a three-dimensional controllable background electromagnetic field, the current of a fingertip three-dimensional orthogonal miniature electromagnet is adjusted, and the electromagnetic acting force of the fingertip electromagnet is regulated and controlled; the three-dimensional controllable background electromagnet consists of an inner-layer one-dimensional laminated electromagnet and an outer-layer two-dimensional array electromagnet; the one-dimensional laminated electromagnet consists of a plurality of hollow disc-shaped laminated coils, and the internal cylindrical space of the one-dimensional laminated electromagnet is an operation space; the outer-layer two-dimensional array type electromagnet is composed of a plurality of two-dimensional coil units and magnetic medium materials wrapping ...

Automobile driving path identification system based on automotive electronic identification, and method thereof

The invention relates to an automobile driving path identification system based on an automotive electronic identification, and a method thereof. The automotive driving path identification system comprises the automotive electronic identification, a road-side RFID reader/writer, and a background processing device. The automotive electronic identification is mounted on the front windshield of the automobile, and stores automobile identity information and driving path information. The road-side RFID reader/writer is used for writing the automobile driving path identification information into the automotive electronic identification and reading the automobile driving path identification information which is stored in the automotive electronic identification. The automobile driving path identification system can effectively settle an ambiguous path identification problem of the automobiles in a quick free flow driving state, and improves an identification accuracy for the ambiguous path. Furthermore ...

Four-DOF (degree of freedom) rehabilitation training robot with adjustable posture

The invention discloses a four-DOF (degree of freedom) rehabilitation training robot with adjustable posture, which comprises a lifting base, a U-shaped frame and a motion output assembly, wherein the U-shaped frame is positioned above the lifting base, and the U-shaped frame is rotationally connected with the lifting base through a first rotating mechanism; the motion output assembly is rotationally connected with the U-shaped frame through a second rotating mechanism; the first rotating mechanism comprises a first bracket arranged on the lifting base and a first worm wheel and a first worm arranged on the first bracket, wherein a second step motor is arranged on the first bracket, the output shaft of the second step motor is connected with the first worm, a turntable is arranged on a first rotating shaft connected with the first worm wheel, and the turntable is connected with the U-shaped frame; and the second rotating mechanism comprises a second worm wheel and a second worm arranged ...

Polyvinylidene fluoride/liquid crystal blending microporous membrane and preparation method thereof

The invention discloses a polyvinylidene fluoride/liquid crystal blending microporous membrane and a preparation method thereof. The microporous membrane comprises the following components by mass percentage (wt%):10-30% of polyvinylidene fluoride, 0.4-4% of macromolecule lyotropic liquid crystal, 56-88.6% of organic solvent and 1-10% of additive. The preparation method comprises the following components of the microporous membrane by mass percentage (wt%) and the following steps: (1) 25-27% of cyanoethyl cellulose or cyanoethyl-ethyl cellulose is dissolved into 25-75% of N,N-dimethyl fomamide, N,N-dimethyl acetamide, N,N-dimethyl sulfoxide, glacial acetic acid or crylic acid, is put in constant temperature of 50 DEG C for 12 hours, and is stood for 72 hours at room temperature to form lyotropic liquid crystal; (2) microporous membrane components are weighted; (3) the organic solvent, polyvinylidene fluoride and additive are evenly mixed, and then the lyotropic liquid crystal is addedto ...

Circular light-emitting signal identification method and system for intelligent networked automobile

According to the circular light-emitting signal identification method for the intelligent networked automobile, circular light-emitting signal identification can be rapidly and accurately completed, and the calculation requirement of the intelligent networked automobile is met. Meanwhile, the invention also discloses a circular light-emitting signal identification system for the intelligent networked automobile. The method comprises the following steps: converting an acquired colored circular light-emitting signal image into an HSI (Hue-Saturation-Intensity) color space, segmenting red, yellow, green, blue and white targets in the RGB color image of the circular light-emitting signal in the HSI space to obtain a target color image, respectively carrying out binarization processing on the target color image of each color to obtain a target binarization image, and carrying out binarization processing on the target binarization image; the method comprises the following steps: respectively ...

Medium-and-high curve, current-voltage curve (CVC) and arbitrary curve grinding device for roller grinder

The invention discloses a medium-and-high curve, current-voltage curve (CVC) and arbitrary curve grinding device for a roller grinder. The device is arranged in a grinding frame; a grinding wheel (1) is arranged on the front part of a shell (2) on the grinding frame; a rolling wheel (12) is connected with a rolling wheel seat (13) through a rotary shaft (14), and is fixed in the shell (2) on the grinding frame; a bearing seat (8), a linear rolling guide rail (9) and a support (10) are arranged on the top surface of a shell (11) below the grinding frame respectively; and a motor (6) is used for driving a ball screw (3) to rotate through a speed reducer (7) and driving a sliding oblique block (4) to slide back and forth along the linear rolling guide rail (9). Through the movement of the sliding oblique block (4), the shell (2) on the grinding frame is swung up and down around a point O, so that the grinding wheel (1) is driven forwards or is retreated, and the requirement that a medium-and-high ...