A cross dehydrogenative coupling reaction of aryl ketones with N-hydroxyphthalimide was realized. The reactions afforded a clean and facile access to diverse N-alkoxyphthalimide derivatives in high yields (up to 99%).
It can improve the learning effect and reduce the learning burden to recommend exercises which are in accordance with the teaching objectives to students. How to accurately judge the needs of students and recommend exercises that are consistent with the teaching objectives is an urgent problem to be solved in the field of personalized education. This paper proposes a personalized exercise recommendation method for teaching objectives. This method can recommend exercises that are highly compatible with the syllabus for students according to their selected knowledge points and expected score range. According to the experimental test, the average prediction success rate of this method is 72.5%, 57.2% higher than the exercise recommendation method based on collaborative filtering and KNN, and 10.6% higher than the exercise recommendation method based on cognitive diagnosis and probability matrix decomposition.
In order to solve the problems existing in the current middle school mathematics classroom teaching process based on teacher-centered teaching mode, the student-centered teaching mode is used as an important measure for many mathematics educators to improve the efficient teaching of mathematics in junior middle schools. Taught by the same teacher, after 2 months, the average score of the class A based on student-centered teaching mode is 2.3 points higher than the average score of the class B based on teacher-centered teaching mode. Considering that the two classes are the same type and in the beginning of the experiment, the class A is 0.5 points lower than the class B, student-centered teaching mode has positively affected the mathematics learning of students in junior high school.
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