62results about How to "Large sampling range" patented technology

The invention relates to the technical field of teaching management systems, in particular to a server with a teaching quality evaluation function. The server comprises a data storage module, an evaluation management module, a data analysis module and a data evaluation module. The evaluation management module is used for controlling a data collection device to perform collection and sending of classroom data; the data analysis module is used for analyzing the classroom data; the data evaluation module includes an attendance evaluation module and an evaluation statistics module, wherein the attendance evaluation module is used for generating student attendance data according to a recognition result of a human face recognition sub-module and basic data of a course, and the evaluation statistics module is used for generating a course evaluation result for the course and updating the course evaluation result in the storage module according to classroom evaluation data records. The server with the teaching quality evaluation function can solve the problems that there are great randomness and subjectivity in existing teaching quality evaluation processes, and the statistics process is cumbersome and time consuming.

The embodiment of the invention provides a business target attribute determining method and device. The business target attribute determining method comprises steps of determining a training sample from evaluation texts to a business target, generating a corresponding first feature vector for the training sample based on a vector format supported by a preset classifier, training the first feature vector and an evaluation value contained in the training sample corresponding to the first feature vector via the preset classifier to achieve a weight taken by feature words of each dimension representing the first feature vector, classifying a to-be-classified evaluation text of the business target based on the feature words and weight to achieve an evaluation value of each to-be-classified evaluation text to true-false attributes of the business target, and determining true-false attributes of the business target based on the achieved evaluation value of the business target true-false attributes. The business target attribute determining method belongs to the technical field of data digging. The business target true-false attributes determined by the business target attribute determining method can be more accurate.

The invention discloses a FPGA (Field Programmable Gate Array) based multi-channel data transmission synchronization delay measurement method and system and relates to the electronic measurement technical field. The FPGA based multi-channel data transmission synchronization delay measurement method comprises step 1, providing a data transmission clock and a frame synchronization signal through a clock module; step 2, sending the every time of amount of phase shift of the clock to a phase shifting module, obtaining the maximum time of phase shift and setting the times of phase shift of the clock; step 3, sending delay data to a sampling conversion module through an IO (Input and Output) delay module; step 4, sending a sampling clock to the sampling conversion module through the phase shifting module; step 5, sending sampling data which are corresponding to link labels to a processing module through the sampling conversion module; step 6, determining whether the position of a sampling point is an unstable transmission position or not through the processing module; step 7, setting the delay order of the data to increase 1 through a control module; step 8, obtaining the unstable transmission position through the processing module; step 9, determining the synchronization delay of the sampling data which are corresponding to the link labels through the processing module. The FPGA based multi-channel data transmission synchronization delay measurement method and system is used for implementing the measurement on the data synchronization delay.

The invention belongs to the technical field of education, and discloses a novel Internet of Things remote teaching system and a control method, and the system comprises a video collection module, anediting module, a central control module, a wireless communication module, a server, a mobile terminal, a course management module, a course query module, a course reservation module, a quality evaluation module, a VR teaching module, and a display module. According to the invention, the classroom performance of each course of the teacher is brought into the final course assessment through the quality assessment module, the sampling range is large, the occasionality is small, and the teaching level and the teaching quality of the teacher can be reflected more truly and accurately; Meanwhile, acorresponding three-dimensional teaching video is acquired at each student position through the VR teaching module, so that when a student corresponding to the image acquisition equipment wears the VR head-mounted display equipment, the surrounding environment and characters can be observed to be familiar with the student, and the reality of remote teaching of a user to classroom restoration is improved.

The invention provides a comprehensive sampler for ambient air, and relates to the technical field of environmental monitoring equipment. The comprehensive sampler comprises a shell. A particle sampling pipeline and a gas sampling pipeline are arranged in the shell. The particle sampling pipeline comprises a particle sampling inlet, a fan and an air exhaust outlet. The particle sampling inlet is connected with a sampling head. The particle sampling inlet, the fan and the air exhaust outlet are connected through a first pipeline sequentially. The gas sampling pipeline comprises an air inlet, asampling pump and an air outlet. The air inlet, the sampling pump and the air outlet are connected through a second pipeline sequentially. The air inlet is connected with a sampling bottle. The comprehensive sampler has the advantages that the multiple sampling pipelines are arranged in the shell, so that both solid particles and gas substances such as sulfur dioxide and nitric oxide can be collected; constant-temperature and constant-flow sampling can be realized, and time-shared interval sampling can be completed; the different pipelines can be switched optionally, and accordingly, economy and practicability are realized.

The invention relates to a river and lake sample collector which comprises a carrying platform, a power driving device, a sampling device, a control device and a power supply device, the power driving device is arranged on the side face of the carrying platform, and the sampling device, the control device and the power supply device are fixedly arranged on the carrying platform. The lower end of the sampling device penetrates through the bottom of the carrying platform and can extend downwards, an anti-backflow device is arranged at the lower end of the sampling device, and the lower end of the sampling device can be blocked into a closed sample cavity by the anti-backflow device; and the power supply device is in power supply connection with the power driving device, the sampling device and the control device, and the control device is in communication connection with the power driving device and the sampling device and used for controlling the power driving device and the sampling device to operate. The collector can automatically complete sampling, can collect bottom mud samples and water quality samples at different depths, and can keep the state of the collected bottom mud not disturbed by water flow.

The invention discloses a four-DOF (degree-of-freedom) coal sampling vehicle capable of independently turning and belongs to the field of coal sampling. The four-DOF coal sampling vehicle capable of independently turning comprises a sampling vehicle body and a hydraulic articulated arm, wherein a sampling head is arranged at the tail end of the hydraulic articulated arm, and independent wheels capable of turning are arranged at the bottom of the sampling vehicle body. When commercial coal is sampled, the sampling range can be enlarged by adjusting the independent wheels and the hydraulic articulated arm, and more sampling points can be selected in certain time for sampling of the commercial coal. Compared with the prior art, the coal sampling vehicle can improve the sampling efficiency and increase the accuracy rate of judgment of the quality of the commercial coal.

The embodiment of the invention discloses a multi-dimensional classified counting and analyzing method and device for network failure reporting data. The method comprises the steps that a failure reporting record file in a network is parsed according to an address parsing algorithm to obtain position information of various failure reporting records; and the failure reporting numbers correspondingto different times and different positions in the failure reporting record file are counted according to the position information. According to the method and device, by parsing the failure reportingrecord file in the network, the network conditions in all scenes can be monitored, the user sampling range is wide, and the sampled data is comprehensive; and meanwhile, the corresponding failure reporting numbers are counted according to the obtained position information of the failure reporting records by combining partition of different times and different positions, the dead zone where a webmaster cannot monitor can be covered, the user experience can be directly embodied, user underlying failure reporting content is taken as an analysis basis to be close to the use feeling of a network user side, user data is directly analyzed, and potential network bottlenecks are objectively reflected.

The invention relates to the field of water body detection, and specifically relates to a floating type automatic descending sampling device for water body detection. The floating type automatic descending sampling device for water body detection is not constrained by a sampling environment, cannot cause personal safety problems and can control sampling depth errors. The floating type automatic descending sampling device for water body detection comprises a pipe body, a lifting rope, floating bodies and the like, wherein the lifting rope is connected to the pipe body, and the floating bodies are arranged on the periphery of the middle of the pipe body. According to the floating type automatic descending sampling device for water body detection, the lifting rope is pulled when the water body is sampled, so that the device is thrown on a water body to float, the device is not constrained by the water body environment, and the sampling range is wide; and a counterweight box body is adopted, the gravity sinking mode is adopted, a positioning mechanism is adopted, the positioning mode is adopted, the movement is limited by a quantity control device, and the step-by-step descending modeis adopted, so that the sampling with small depth errors can be carried out in the water body with the density lower than that of the counterweight box body.

The invention relates to the field of construction tools, in particular to a portable soil sampler for construction, which comprises a soil sampling fixing seat, a hole drilling driver, a driving threaded sleeve, a hole drilling threaded cylinder and a stratified soil sampler; the hole drilling driver is fixedly connected to the soil sampling fixing seat, and the inner end of the driving threadedsleeve is longitudinally connected into the hole drilling driver in a sliding manner; the outer end of the driving threaded sleeve is connected into the soil sampling fixing base in a threaded fit mode, the driving threaded sleeve is fixedly connected to the drilling threaded cylinder, and the stratified soil sampler is connected into the drilling threaded cylinder in a sliding mode; the soil sampler has the beneficial effects that drilling and holing can be automatically carried out on the position of soil to be sampled; transverse depth soil sampling can be carried out on soil with differentdepths after hole digging, the sampling range of soil sampling can be expanded conveniently, and sampling and transverse and longitudinal comparison are carried out on deep soil; the portable soil sampler is very convenient to carry and install, and is convenient for field detection and sampling.

The application provides a crop physico-chemical parameter measuring device, comprising: a measuring device body including a first surface and a second surface arranged oppositely, and a device connector disposed on the side of the first surface and second surface opposite to the measuring device body; the device connector includes a connection shaft and a connection rod, wherein one end of the connection shaft is releasably connected to the first surface and second surface of the measuring device body; the other end of the connection shaft is connected with the connection rod. The measuring device body is mounted on a handle, a support or an unmanned aerial vehicle through the connection shaft and the connection rod so that the measuring device may be held by single hand and double hands; for crops of great height, the measuring device may also be rested on a measuring support or mounted on an unmanned aerial vehicle through the device connector; measurement and data collection are performed through the unmanned aerial vehicle, the crop sample point range is widened, and collected samples may be more representative.