Peaceful coexistence is not seen as a new topic of secretions of modern civilization, a requirement to solve the problems of our era or one of the indications of urgent immediate needs, rather, tolerance is considered basis for building a state. Therefore, we can touch on the principles and basics of tolerance in the Holy Qur’an, the speeches of the Messenger (may God bless him and grant him peace) and his hadiths, and the principle of brotherhood that he established

This paper deals with the modeling of a preventive maintenance strategy applied to a single-unit system subject to random failures.

According to this policy, the system is subjected to imperfect periodic preventive maintenance restoring it to ‘as good as new’ with probability

p and leaving it at state ‘as bad as old’ with probability q. Imperfect repairs are performed following failures occurring between consecutive

preventive maintenance actions, i.e the times between failures follow a decreasing quasi-renewal process with parameter a. Considering the

average durations of the preventive and corrective maintenance actions a

اهتم العديد من الباحثين والمحققين في دراسة أبي البركات الأنباري ، كونه أديبا ولغويا ومفسرا ، ونشروا معظم ما وصل إلينا من مؤلفاته ،لكن كما يبدو أن الانباري، مؤرخا ، لم ينل حظه من الاهتمام والدراسة على الرغم من أن كتابه (نزهة الألباب في طبقات الأدباء) قد نشر وحققه صفوة المحققين ^([i])وذلك انهم أغفلوا التعريف بمنهجه ودراسته لاسيما وأن التأليف في كتب الطبقات من أهم مناهج الكتابة التاريخية

Sufi architecture (gorges, bands, and zawiyas) played an important
role in the development of Islamic civilization, especially since these
buildings are used as centers of religious education and Sufism, where
people are taught the basic principles of Islam, the biography of the
Prophet, and Sufism.

The Studying of  historian aspects in Al-Hadieth books  , such as " Al-Musnad  Book    " subjected to  Al-Imam Abi Yalaa Al-mousily" ,has great importance in the field of Islamic history , in which Al- Al-Imam Abi Yalaa Al-mousily  has presented valued information that  have significant impact on the understanding of history, Have a significant impact on the understanding of Islamic history

The aim of the current research to determine the extent of logical intelligence in the book of chemistry for the fifth grade of science and to achieve the goal the researcher has prepared a special criterion in the areas of logical intelligence main and sub-to be included in the book after reviewing the previous literature and studies in this regard may be the final form after presentation to experts and arbitrators in the field of Educational and psychological sciences, curricula and teaching methods from (3) main areas and (21) sub-fields, then the researcher analyzed the book Bibih and applied branches and adopted the idea of ​​both explicit and implicit as a unit of registration and repet

انف كتاب أي.أس.أمىز(6291-9006) انشعشي شاطًء الاشجاس ((1981مه 73قصٍذي. ٌىاقش انبذث ٌزي انقصائذ مه مىضُس فهسفت انطاًٌَ َانتً اتبعٍا انشاعش بذقً فً كتابً.ٌظٍش انكتاب بُضُح انكثٍش مه ملامخ انطبٍعً َانتً تتضمه تغٍشاث دٌىامكًٍ َتطُس تذسٌجً نمختهف انكائىاث انذًٍ .ٌصف انشاعش فً اَل سهسهً مه قصائذي انصُسي انذقٍقًٍ نهكُن مه خلال سؤٌا عمٍقً نهطاًٌَ َانتً تظٍش جهٍا مه خلال تفاعم الاوسان مع انطبٍعً.تُضخ انقصائذ تقاسب انطاًٌَ م