7results about How to "Meet sampling needs" patented technology

This utility model relates to the technical field of water quality sampler brackets, specifically to a portable water quality sampler bracket, including a base and a support mechanism. The support mechanism includes a support component, a transmission component, and a reinforcement component. The support component includes a support cylinder disposed above the base. Multiple support rods are fixedly connected between the side wall of the support cylinder and the upper surface of the base. A top plate is fixedly connected to the top of the support cylinder, and an electric telescopic rod is fixedly installed on the bottom surface of the top plate. This utility model, through its support component, enables precise and rapid adjustment of the mounting bracket height to meet the sampling needs of water bodies at different depths. The reinforcement component significantly enhances the stability of the bracket in complex environments, effectively resisting the impact of water flow, wind, and other external forces, ensuring the stability of the water quality sampler during sampling.

The invention discloses an unbalanced graph data oversampling method and system based on a topological structure, a storage medium and equipment, and belongs to the field of data mining, and the method mainly comprises the following steps: carrying out community division on an unbalanced graph by adopting a community detection algorithm; for minority class nodes in the unbalanced graph, performing node representation from two aspects of node feature representation and node local topological structure representation; based on the node representation of the minority class nodes, generating synthesis nodes by adopting an oversampling thought, and embedding the generated synthesis nodes into the unbalanced graph; wherein the step of generating the synthesis node by adopting the oversampling thought comprises the following steps: generating a local topological structure of the synthesis node, and determining the characteristics of the synthesis node; and iteratively generating composite nodes and embedding the composite nodes into the unbalanced graph until the minority class nodes and the majority class nodes in the unbalanced graph keep a required quantity proportion. According to the method, synthesis of minority classes is realized completely based on the topological structure of the graph, and finally interpretable graph data class imbalance processing is realized.

The invention relates to the technical field of water quality testing, and discloses a two-insect enrichment method based on a selectable double-filtering mode, which comprises the following steps: S1, preparing a two-insect enrichment device and setting two-insect enrichment parameters corresponding to the selectable double-filtering mode; the selectable double-filtering mode comprises a water pressure filtering mode under the condition that a faucet is arranged and a pump filtering mode under the condition that the faucet is not arranged; s2, under the condition that one water sample filtering mode in the double filtering modes is selected as a water pressure filtering mode according to field conditions, implementing the step S3; selecting one water sample filtering mode in the double filtering modes as a pump filtering mode according to field conditions, and implementing the step S4; s3, enriching the two insects on the basis of a water pressure filtering mode; and S4, enriching the two insects based on a pump filtering mode. The invention further discloses a corresponding two-insect enrichment system and a two-insect enrichment device, two insects in a water sample can be concentrated by adopting two selectable modes of pump filtration or water pressure filtration, more sufficient filtration mode selection is provided, the two-insect enrichment efficiency is improved, and the enrichment application scene is expanded.

The invention discloses a handheld digital oscilloscope which comprises a main control chip. The attenuation circuit is provided with four input resistors, and each parallel compensation capacitor and the adjustable capacitor form a resistor-capacitor pair; the in-phase input end of a first operational amplifier is connected with the attenuation circuit, and a feedback resistor is arranged between the anti-phase input end and the output end of the first operational amplifier; the first adder circuit and the second operational amplifier eliminate direct current bias of the alternating current signal; the second adder circuit and the third operational amplifier perform direct current lifting on the signal and then input the signal into the main control chip; the fourth operational amplifier is connected with the second adder circuit, and the inverted input end of the fourth operational amplifier is connected with three feedback resistors in parallel; the high-speed comparator circuit outputs TTL level signals; the key circuit and the keyboard management chip are connected with the main control chip; the power circuit supplies power. Therefore, the device has the advantages of high measurement precision, good sampling performance, rich and practical functions, convenient man-machine interaction and the like.

The utility model relates to the technical field and discloses petroleum waste gas sampling equipment which comprises a sampling cylinder, a piston rod is arranged in the sampling cylinder, one end of the piston rod is fixedly connected with a piston head, the piston head is in sliding connection with the sampling cylinder, the other end of the piston rod is fixedly connected with a pressing disc, and the upper surface of the sampling cylinder is fixedly connected with a suction nozzle. A guide pipe is fixedly connected to the interior of the sampling cylinder, a valve is arranged in the guide pipe, a quick connector is arranged at the tail end of the guide pipe, the quick connector is detachably connected with a sample storage bag, and a label bag is arranged on the outer surface of the sample storage bag. A quick connector and a sampling bag are arranged, so that the sampling bag can be replaced, and the working efficiency of sampling personnel can be improved; the connecting rod is connected with the pressing disc through a thread, so that collection personnel can conveniently collect waste gas at a high position, and the sampling requirements of waste gas at different heights can be met.

The utility model discloses a kind of sampling devices for food safety detection, it is related to food detection technical field, including sampling cylinder, the bottom of the sampling cylinder is respectively fixedly connected with large pipe diameter pipette and small pipe diameter pipette, the inner wall bottom of the sampling cylinder is movably connected with adjusting closure plate, the upper surface of the adjusting closure plate is equipped with butt joint hole one and butt joint hole two.The utility model can be according to food and beverage type, such as whether containing fruit pulp particle, quickly switch using different pipe diameter pipette to sample, greatly improve the adaptability of sampling, ensure that various samples can be accurately extracted, sampling length is adjustable, convenient and efficient operation: large pipe diameter pipette inner wall screw connection built-in threaded pipette, when needing to change sampling pipette length, built-in threaded pipette can be realized by using threaded rotation extraction, easy operation, meet the sampling demand of different depth or special position sample.

This invention discloses a greenhouse gas sampling device and method for soil layers. The sampling device includes a sampling support with a layering mechanism along its length, dividing the support into several sampling zones. Each sampling zone contains a sampling cylinder for sampling gases at a corresponding depth, and the sampling cylinder is fixed to the layering mechanism. The layering mechanism includes an adjusting plate and a sealing ring embedded around the adjusting plate. The adjusting plate is limited by an adjusting rod on the sampling support, and the adjusting plate and the adjusting rod are screwed together. A driving mechanism is located below the sampling support to rotate the adjusting rod and adjust the layering depth of the sampling zone. The adjusting plate and the adjusting rod are screwed together, and the driving mechanism drives the adjusting rod to rotate, thereby adjusting the height of the adjusting plate. This allows the device to meet the greenhouse gas sampling needs under different environments and improves its adaptability.