Based on the engineering background, the 41051 working face of the 65th coal mine in Qitaihe Xinxing Mine was regarded as the engineering background, by using of the comprehensive research methods such as theoretical analysis and calculation, FLAC3D numerical simulation, physical parameters of coal and rock in laboratory, and the field industrial measurement, to research on the large drilling relieving rock burst mechanism and parameter setting in reasonable. The distribution of stress and plastic zone in drilling surrounding rock and its influence parameters are clarified, and the distribution of the “butterfly plastic zone” and the mutation condition of the “butterfly plastic zone” in trigger stress state are explored. On the basis, combined with theoretical analysis and numerical simulation, studying the rock burst prevention and treatment mechanism in large drilling, through the statistics of the Xinxing mine pressure characteristics, the measurement of the physical parameters of coal and rock and the test of ground stress finding is that the coal satisfies “Three hard” condition in Xinxing mine and is affected by larger horizontal tectonic stress. Combined with the real geological conditions, the layout parameters of relief pressure large drilling are simulated, and the result shows that the drilling of 600 diameters and 10 m pitch of hole and throughout the working face is reasonable, and the effect is obvious about pressure relief. For the practical implementation, the electromagnetic radiation monitoring is used to evaluate the effect in field; to comprehensive analysis, the relief pressure large drilling has obvious control effect to the 41051 workface rock burst.

No abstract

No abstract

BACKGROUND Human papillomaviruses (HPV) are responsible for the most common sexually transmitted infection in the world and persistent infection of oncogenic types is associated with an increased risk of cancers. This infection could be prevented by vaccination. However, in a time of vaccine hesitancy, the decision to get vaccinated or to have a child vaccinated is the result of a complex process and decision aids are tools that may be of help in this context. OBJECTIVE The aim of this article is to present the development of a shared decision aid for HPV vaccination in France, destined to be used during general practice consultations. The construction of the shared decision aid is a part of the PrevHPV experimental study, an evaluation of a multicomponent intervention aiming to improve HPV vaccination coverage. METHODS In order to develop the decision support tool, we followed the steps recommended by the International Patient Decision Aids Standard (IPDAS), i.e. scoping and defining the objectives, assembling the steering group, designing (carrying out two focus groups and a narrative review of the literature) and testing in a alpha test phase (carrying out three focus groups and 11 individual interviews). The tool was co-constructed with adolescents, parents and general practitioners. RESULTS We created an online shared decision aid which included the definition of HPV, epidemiological data, the mode of contamination, the different locations of the disease, the development of cancer, the importance of Pap smears, the effectiveness of the vaccination as well as the possible side effects. The various focus groups as well as individual interviews made it possible to determine the values and expectations of patients and physicians thus improving the decision aid. This development also made it possible to confirm an existing need for this type of tool for both patients and physicians. CONCLUSIONS We have developed a shared decision aid that could help general practitioners communicate about HPV vaccination and get more patients vaccinated. This SDA will be validated in a beta-testing phase. The impact of its use during the consultation will be evaluated on criteria such as the resolution of the decision-making conflict and ultimately on the vaccination coverage, as part of the PrevHPV study.