With transformation of medical model and development of medical and health service, nurses often appear the phenomenon of job burnout. Sampling questionnaire of nurses’ formal backgrounds and MBI-SS, we conduct a survey on 280 re-post professional nurses who have been working for one or more years to know the present situation of job burnout and to analyze relative factors, thus providing a theoretical basis for solving the problem of nurses’ job burnout in Tangshan private hospitals. The result shows that the job burnout phenomenon is widespread; the job burnout level of male nurses is lower; PD’ nurses are easier to feel burnout and ED’ nurses have low personal accomplishment; the more satisfaction to higher salary, the lower of their job burnout. All these indicate that, it does help to relieve nurses’ sense of burnout, if we arrange their job volume appropriately, improve their treatment.
This paper presents a study for the interaction of a penny-shaped interfacial crack and a center of dilatation in an infinite bimaterial, which can model the rock fracture subjected to stress and thermal dilatation during some engineering process. The solution is obtained by decomposing the original problem into two auxiliary problems: (I) a center of dilatation near a bimaterial interface (no crack); and (II) a penny-shaped interfacial crack subject to internal tractions that cancel out those induced in auxiliary problem (I). The mode I, II and III stress intensity factors (SIFs) are calculated to investigate the possible propagation of the pre-existing penny-shaped interfacial crack. The convergence of the developed numerical method is checked, and the interaction of a penny-shaped interfacial crack and a center of dilatation are calculated and discussed.
This paper presents a three-dimensional viscoelastic model to study the interactions of a penny-shaped interfacial crack and a center of dilatation in the infinite viscoelastic bimaterial, which can model the rock fracture subjected to stress and thermal dilatation during some engineering process. A distinct issue associated with the present work is the incorporation of viscoelastic behavior of bimaterial. The proposed problem is first transformed into the Laplace space, and the solution in the transform space is obtained by decomposing the original problem into two auxiliary problems: (I) a center of dilatation near a bimaterial interface (no crack); and (II) a penny-shaped interfacial crack subject to internal tractions that cancel out those induced in auxiliary problem (I). The mode I, II and III stress intensity factors (SIFs) in the time domain are obtained with the inverse Laplace transform.
This paper presents a study for the square crack in a three-dimensional infinite transversely isotropic medium, which can model the fracture damage of rock that displays transversely isotropic behavior. The study is based on a newly derived boundary integral equation. To carry out the numerical simulation, the crack opening displacement is first expressed as the product of the weight functions and the characteristic terms, and the unknown weight is approximated with the moving least-square approximation. A boundary type numerical scheme is established, and the effect of the orientation of the principle axis on the stress intensity factor is studied. The interaction between two coplanar square cracks are also modeled and discussed.
The crack tip stress field of rock is analyzed under blast loading, and the crack arrest criterion, the conditions of rock crack initiation and crack extension are presented in this paper. The study will help the design of maintaining the stability of stope drift active workings.
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