Based on studying the "hard core" and "protective belt" of relevance translation theory,the paper points out its existing problems and clarifies some misunderstandings on relevance translation theory.

We can describe distinguishing features of different schools on the basis of hard core, protective belt and heuristics.

Firstly, analyzes frame that is hard core, protective belt, and periphery, conclude the characters of so.

Study on acrylic emulsion pressure-sensitive adhesive for protective film;

Analyses the importance of protection of belt broken for uphill belt conveyor,summarizes the technology of broken belt protection,emphatically introduces the eccentric roller type broken belt protector and the SPDB-Ⅰwedge type broken belt protector,analyses their design feature's and compares their performance.

The paper introduces a conveyor broken belt protector which uses a self-locking wedge to fasten the gliding belt,establishes the mathematical model of the fastening wedge,provides the factor for the self-locking wedge and the formula of the braking confidence coefficient and analyses the influence of the wedge angle and friction angle on the braking performance.

For the OFDM(orthogonal frequency division multiplexing) systems with guard band,the permissible biggest guard bandwidth is computed on the bases of the conventional UPPTS(uniformly placed pilot tones sequence) design and the premise that the MSE(mean square error) of the LS(least square) channel estimation must be minimum.

To avoid guard band, the domain of initial pilot placement and the maximum guard bandwidth were proposed.

Based on the Characteristics of the semiconductor lightning eliminator and considering its applying field of electric power system,this pa- per proposes a method of consisting a Combined protective net-belt with the semiconductor lightning e- liminator,and summarizes the practical experience with applying semi-conductor lightning eliminator.