دور الشباب في رقي الأمم وازدهارها الحضاري على أساس الدين والعلم والأخلاق من منظور السيرة النبوية

Islam took great care of youth, because youth in Islamic nation are the shining stars, they are the backbone of nation and source of its survival and the pillars of advancement in the peace, and the soldier of victory in the war, and the hope of nation's present and future. Nations achieve greatness on the shoulders of their faithful and committed youth those who want progress, innovation and scientific competition in all sphere of the life, and serve great in uplifting of their Islamic nation. This article is an attempt to answer some questions, such as: possibility of the renewal of ideas of youth and concepts of the religious texts to work on drafting a practical approach for the advancement and prosperity based on the teachings of the religion that urges to wisdom with knowledge and ethics? This article deals with the Importance of youth’s role in progress of the nations and development of their civilizations in light of Holy Qur’an, Writing the idiomatic concept of the word "civilization, the impact of religion, science and ethics in advancement and property of nations, the causes and factors that led to the decline of the Islamic civilization, the foundations and pillars of western civilization, and the most important foundations on of the youth for advancement and prosperity of the nation. All these points are discussed in the article with a special reference an as taken is (صلى الله عليه وسلم) Prophet Holy of life the and Sunnah and Quran of excellent example for the development of nation with special reference to its youth.

Biomechanics of the Spermatozoa Transport Through the Human Cervical Canal

In this thesis mathematical models of the spermatozoa transport through the Newtonian, Jeffrey and couple stress fluids filled in the cervical canal are developed and investigated theoretically. Modeling of the biomechanical model provides the partial differentials equations and the subsequent equations are solved analytically. Physical quantities like pressure gradient, mucus velocity, propulsive velocity, time mean flow rate, mucus temperature and heat transfer coefficients are examined for the appurtenant parameters. Salientfeaturesofthepumpingcharacteristicsareobserved. Itisnoticedthatthepropulsive velocity of the swimming sheet of the spermatozoa enhances for higher Reynolds number, lower Froude number, and vertical canal. It is intriguing to take note of that, maximal slippage on the upper cervical wall and zero slippage on the lower cervical wall amplify the probability of the spermatozoa to prepare a fertilized ovum. It is found that pressure rise facilitates the motion of spermatozoa to fertilize an ovum in the female reproductive tract whereas pressure drop inverts the direction of spermatozoa to the vagina and controls the probability of pregnancy. It is clear that the inclusion of porous medium lessens the propulsive velocity of the spermatozoa. Minute impact of phase difference on propulsive velocity is evident. The spermatozoa attain their maximum propulsive velocity for nonporous cervical walls. An increment in slip parameter and Reynolds number cause enhancement in the propulsive velocity of the spermatozoa. Effects of constant, linear, sinusoidal, logarithmic and exponential secreting velocities on propulsive velocity are also explored. Furthermore,comparisonofthepropulsivevelocityofnon-Newtonianfluidwith the propulsive velocity of Newtonian fluid is made. Comparison of the current analysis with the existing literature and experimental data is also made.