3results about How to "Prevent quality deterioration" patented technology

This invention discloses a classroom interaction quality assessment and teaching reflection system based on voice emotion recognition, belonging to the field of educational informatization technology. It includes a voice data acquisition module, a voice data preprocessing module, a voice emotion recognition module, a voice data segmentation module, an interaction depth quantification module, a classroom interaction quality index calculation module, an early warning signal generation module, and a teaching reflection auxiliary module. This invention constructs a multi-level classroom interaction quality assessment system. Through the identification of teaching links and a dynamic weight adjustment mechanism, it significantly improves the scientific nature of the assessment. Based on the current interaction state, it predicts future quality change trends and combines a dual-indicator early warning mechanism of declining slope and minimum point to support teachers in timely adjustments to teaching strategies during class. It also introduces counterfactual reasoning technology to conduct multi-dimensional causal contribution analysis of weak teaching links, improving the scientific nature and operability of reflection.

This utility model relates to a device for continuous clean transfer and sterilization of powders, comprising: a sterilization chamber, a feeding device, a heating device, a first collection tank, a second collection tank, and a motor. The sterilization chamber is externally connected to a cylinder and internally contains several stirring paddles. A valve is provided between the sterilization chamber and the cylinder. The sterilization chamber, stirring paddles, and motor are connected to other components via a rotary sealing coupling. This device solves the problems of low sterilization efficiency, easy deterioration of material quality, and risk of secondary contamination in existing sterilization chamber devices, achieving highly efficient sterilization of granular powders while maximizing the stability of the material's effective components and original quality.

The invention provides a method for preparing disproportionated rosin. The method comprises the following steps: a raw material pretreatment stage, a clarification and separation stage, a primary reaction stage, a catalytic disproportionation stage and a post-treatment stage to obtain a disproportionated rosin product. According to the method, three-step chemical modification of the porous ceramsite carrier is combined with a stepped temperature control strategy, so that the content of dehydroabietic acid in a disproportionated rosin product is increased, abietic acid residues are reduced, meanwhile, the stability of the catalyst is effectively improved, and the technological process is simplified.