This study showed how the aorta is continually to blood pulsatile stresses caused by the effect of the heart. These constraints are noted by an elastic deformation of the organ. We have implemented some methodologies mathematics that have allowed us to evaluate the blood interaction / aorta by solving differential equations to describe the mechanical characteristics. The device doppler echo and Solidwokes software have been exploited to establish consistency between the literature review and experimental observations in the laboratory.

The study of the determinants of resistance to the use of contraceptive methods among women of childbearing age in the city of Kinshasa in the Democratic Republic of Congo (DRC) that we have just conducted focused on 2,373 women drawn in the Districts, Communes, Quarters and streets of Kinshasa. Contraceptives being divided into groups of: - modern contraceptives; - traditional contraceptives and others. This study has shown that there are women who do not like to use contraceptives, others use some by rejecting others. Therefore, the following characteristics of resistance to use of contraceptive methods at women of childbearing age: age; the level of education, the number of children born; financial income; the occupation of women; marital status; the place of residence; The religion and opinion about these methods have been developed and proved that this behavior stems from the misinformation given to women about these methods. The statistical analysis using the Chi-Carré test was done to show the number of resistant women and those who use some of the contraceptive methods. The Epidata software was used to plot the tables carrying the results.