Professional quality refers to the basic quality and capacity while people engage in professional activities.By its very nature,It at least should include the levels of professional ethics,professional knowledge and professional capacity.Professional quality education in higher education institutions should be focused on professional ethics,improve their professional ethics,build the three classes integration mechanisms,train professional knowledge and professional skills.At the same time,we should pay attention to the construction of work system to to adapt to the needs of the development of higher vocational education.
Leading with the development of domestic and foreign electric-drawn coal-mining machine, the paper analyses its current status and development trend, offers the study contents of domestic electric-drawn coal-mining machine.
Through analyzing the structure of the alluvium and bedrocks, a discrimination method of main influence factors of surface subsidence was proposed, and the discrimination formula was put forward. Taking the overburden and ground surface of the large cutting height working face in Bin Chang mining region as the research object, the structure and location of key stratum and the structure of the alluvium was analyzed. Besides, through the surface monitoring, the parameters of ground movement and deformation was given, and the discrimination method was verified to be correct. Furthermore, using numerical simulation, the alluvium and bedrocks influences on the surface subsidence under different mining width were studied respectively; the ground movement and deformation characteristics under the influence of alluvium and bedrocks were put forward. The study has provided a basis for the prediction of surface subsidence under certain conditions.
With the fast development of domestic and international telemetry technology,the requirement for the real-time collection and control of digital information becomes higher.The paper puts forward a kind of programmable PCM based on FPGA,in order to reach dependability and flexibility of telemetry system.
This paper presents an intelligent vehicle based on ATmega128L MCU.This system can set the route in advance.The vehicle can communicate with the PC via nRE401 and can run safely with the help of the ultra sound detection and infrared measured circuit.A neural network learning system is introduced to improve the intelligence of the vehicle.
In order to study the soil deformation influenced by adjacent piles when subjected to large area loading,3D finite element method was adopted to investigate the pile-soil interaction in the Beilun power station preloading project.By considering the pile restriction to soil deformation emphatically,the numerical simulation analysis showed that the soil settlement decreased with piles existed,while the soil lateral deformation increased around the piles in a certain range close to the ground.Moreover,the bending moment of pile body and the stress of the steel embedded in the pile were calculated to examine the stability of break wall pile foundation under loading.An empirical equation of maximum bending moment was obtained for piles with caps.Good agreement of calculated results with the measured data showed that this work can be used to support the relative design and construction.
Ion nitriding of A4 dual-phase stainless steel was investigated.The results show that the nitriding temperature and the ratio of nitrogen to hydrogen will have influence on the nitrided case depth without appreciably affecting the hardness.The surface hardness of nitrided case will be as high as 1200～1300 HV0.3,and the nitrided depth will be 0.1 mm for A4 dual-phase stainless steel while being ion nitriding at 580 ℃ and at a ratio of 1 part of nitrogen to 9 part of hydrogen.
Temporary support of the gob side entry is of great significance to the safety mining. Taking the 1206 transportation tunnel of Shuguang Coal Mine as the engineering background, firstly, the key technical parameters of roof cutting to release pressure were given, the bolt and cable support parameters before entry retaining and the large deformation constant resistance cable reinforcement support parameters of retained entry were determined. Secondly, according to the overlying strata collapse patterns and mechanical model of gob side entry, the calculation formula of temporary support resistance in the dynamic pressure bearing area was derived. Finally, on the basis of determining the temporary support parameters, ZLQ2826/22.5/38 type of nonrepeated support and transportation equipment of alternating pressure cycles was developed, the main technical parameters and structural characteristics were analyzed, and a new type of fast and efficient non-repeated temporary support technology in the dynamic pressure bearing area was proposed. Field practice shows that the support parameters are reasonable, the support equipment and bolt support system have a good cooperative support effect, and the roof subsidence and roof separation have been effectively controlled. In the subsequent use process, the structure of support devices should be further optimized to improve the support effect.
Nickel-chrome series electrical heating alloy is a important sort of electrical heating engineering material.Coiled wire rolling is a key process step in the production of electrical heating alloys wire.This paper studies the pass design for rolling Cr20Ni80 electrical heating alloy coiled wire on the open-train mill,analyzes the common rolling defects,and puts forward the optimizing pasystem.
Artificial support system takes advantages of self-bearing capacity of surrounding rock mass in roadway support, which is one of the important supporting ideas in modern times. The implementation way of an artificial support system is worthy of deep investigation. In this study, an HLBR hypothesis was proposed with comprehensive consideration of mechanical properties of surrounding rock mass based on the reinforced arch theory and axial variation theory. A model of bearing structure in surrounding rock mass was constructed, and the stress state on the bearing structure was analyzed. It was believed that when the axial ratio (k) of this bearing structure is equal to the lateral stress factor (λ) (which is the optimal axial ratio), the tangential stress on the bearing boundary reaches the minimum and is in uniform distribution. At this moment, the roadway and the supporting structure can make good use of the self-carrying capacity of surrounding rock mass, which is conducive to lowering the stress distribution level of surrounding rock mass. According to prestress diffusion characteristics of bolt, some ways to achieve HLBR were proposed, which were the optimal axial ratio design, difference support and local grouting modification, and finally performance of the original support design in a belt roadway of the mining district IV of a mine in Shanxi Province. A new supporting scheme was provided according to the HLBR hypothesis. In addition, the FLAC3D strain-softening model was modified by C++, which was used to interpret the reasonability of the suggested supporting scheme. The proposed HLBR hypothesis discloses ways to use self-capacity of surrounding rock mass. This study provides a new idea for roadway sectional design and roadway support design, which are beneficial to maintaining the stability of surrounding rock mass in roadways.
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