mehdi nowrozi

In this research a software is developed to simulate the partial cavitation over the axisymmetric and quasi three-dimensional bodies using a Boundary Element Method (BEM).According to desirable convergenceof axisymmetric simulation in BEM, first the axisymmetric cavitation flow is simulated and this result is used to simulate quasi three-dimensional bodies. In order to simulate the cavitation flow, the source and dipole rings are distributed on body and cavity boundaries, Using Green's theorem integral expression and to simulate closure of cavity, two models is used: simple closure model and re-entrant jet model. The constant length of the cavity is initial prediction and the cavitation number and shape of cavity are the main results of this simulation. The validation of solution, the Navier-Stokes equations based on mixture model is compared to BEM results in convergense and accuracy. Compression between this results and other experimental and numerical simulation show the ability of BEM in simulation of cavitation flows with desirable convergence and relatively good accuracy.

Different studies performed in the world and Iran reported the educational level of the mother، history of more than four pregnancies، living in rural areas، receiving no prenatal health care، and lack of access to maternal emergency services as the most important factors affecting maternal mortality rate. Few studies have determined contribution of indirect causes of maternal deaths. This study aimed to determine the contribution of indirect causes of a maternal death in Markazi province. This is a retrospective and descriptive-analytical study. Case report method and Root Cause Analysis (RCA)، as an important method used in clinical epidemiology، were applied to describe and analyze a maternal mortality occurred in Markazi province، respectively. This approach deals with identification and solving the root causes of health problems (Sentinel Event). Data were collected by interview and inspection of written documents. Bayesian analysis and calculation of the conditional probabilities were applied using Netica 5. 08 software. Receiving no maternal prenatal care، not following the ministerial and provincial guidelines، lack of team working and coordination between medical specialists in the treatment of high-risk pregnant women in the hospital were identified as indirect causes of the maternal death. Indirect causes accounted for 43% of the maternal death. Indicating cardiomyopathy as a cause of death on death certificate of the mother was incorrect. Determining the principal cause of the death، Root Cause Analysis، and eliminating the indirect causes of the death play important roles on decreasing 50% of the maternal deaths.