Abstract: A digital education record management method based on the blockchain token technology, the method includes: generating a fixed number of tokens on the blockchain of the entire network through a hash algorithm; generating an educational institution hash address and a management key matching the educational institution hash address for an educational institution; assigning a sufficient number of tokens to the educational institution according to the scale and requirement of the educational institution; generating a student hash address and a management key corresponding to the student hash address for the student through the hash algorithm; establishing a unified issuing rule of the token by educational institutions, issuing the token to the student when the student meets the rule; reading data on the blockchain node by using a blockchain scanning tool; generating a digital education record for the student according to the data; checking the digital education record through an authorization key.

Abstract: A digital education record management method based on the blockchain token technology, the method includes: generating a fixed number of tokens on the blockchain of the entire network through a hash algorithm; generating an educational institution hash address and a management key matching the educational institution hash address for an educational institution; assigning a sufficient number of tokens to the educational institution according to the scale and requirement of the educational institution; generating a student hash address and a management key corresponding to the student hash address for the student through the hash algorithm; establishing a unified issuing rule of the token by educational institutions, issuing the token to the student when the student meets the rule; reading data on the blockchain node by using a blockchain scanning tool; generating a digital education record for the student according to the data; checking the digital education record through an authorization key.

Abstract: In a method and a system for recording a webpage reading process based on a piecewise interactive mode provided by the present invention, wherein a student logs in a client, obtains learning contents from a server and displays the learning contents in a browser, when the student learns related learning contents, the student is likely to operate the browser, and the browser will obtain the browser operation condition of the student from the client in real time, so that the learning condition of the student can be obtained. Moreover, corresponding information will be returned to the browser in real time according to the browser operation condition of the student. Specified learning contents are sent to the student according to the browser operation condition of the student. The method has the advantages of being simple, direct and convenient, thereby having a wide application prospect.

Abstract: The present invention relates to a method and device of interactive answering between computer end and mobile end in classroom based on a two-dimensional code technology. A computer end with screen generates a teaching-used web page having question and answer option buttons, and a two-dimensional code including the address of the web page is displayed on the web page; students use mobile ends to scan the two-dimensional code, then enter the web page corresponding to the internet address and display an answering page; the mobile ends answer a question on the page online by inputting; and the computer end counts and displays answering results of the mobile ends. Compared with the prior art, the present invention realizes connection and interaction between a large electronic screen and mobile terminal equipment of students in a classroom.

Abstract: The magnetic and magnetotransport properties of field-aligned single domain half-metallic CrO2 powders have been studied. Needle-shaped nanoparticles of CrO2 have been aligned in a strong magnetic field. The aligned powder sample shows a strong anisotropy along the alignment direction. The conduction mechanism of the aligned CrO2 powder sample has been examined and is consistent with the intergranular spin dependent tunneling. Negative tunneling magnetoresistance (TMR) of about 41% is achieved in a small field in the vicinity of the coercive field at 5 K. The magnetoresistance (MR) versus field curve shows two well-separated narrow peaks at the coercive fields and resembles that of a magnetic tunnel junction. This junction-like MR results from the narrow switching field distribution of the aligned powders. The results suggest that the aligned magnetic CrO2 particles may find novel applications in spin transport structures and devices.