Study of ultrasonic transmitting ultrasonic transmitter in a direction to launch at the same time at the beginning of time, the spread of ultrasound in the air, on the way encountered obstacles to return immediately, the ultrasonic reflected wave received by the receiver immediately stop the clock. Using the propagation speed multiplied by the time, we can reach the distance of the obstacle
Learn the principle of the steering gear and application scenarios. Rudders can be used in UAVs, flight control, robots, joints, etc.. In the course of the study, the children used potentiometer control steering gear Click Here
The computer is the foundation of the modern information science and technology, and has become one of the social essential skills, and it will change the way people work and live greatly now and in the future. In recent times the middle school students summer camp activities, and several excellent information science contest students learned that many of them began to contact computer programming from grade three or four in primary school, and most of them are all powerful computer novelty attracted by. Therefore, it is necessary to carry out the necessary computer education in primary and secondary schools. At the same time, students who have some special skills in the field of informatics can participate in the information competition
This paper researches on parents' educational anxiety during the transition from kindergarten to primary school. The Self-compiled Questionnaire for Parents' Educational Anxiety during the Transition from Kindergarten to Primary School, and the individual interview are used. 165 parents have been surveyed by questionnaire and 8 parents have been interviewed after random sampling. The results show that (1) 82.05% of parents had educational anxiety during the transition from kindergarten to primary school, including 49.22% of parents in the severe educational anxiety and 32.81% of them in the moderate educational anxiety. (2) Ranking of five dimensions for anxiety: learning habit anxiety (69.53%), learning ability anxiety (55.47%), anxiety about entering higher school and selecting school (50.78%), viability anxiety (12.59%) and social communication anxiety (0.87%). (3) Different anxiety points had been shown in five anxiety dimensions. Read More
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