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

تحتل أدوات السياسة المالية (الإنفاقية والإيرادية) مكانة مهمة بين أدوات السياسات الاقتصادية الأخرى لما تتمتع به من تأثيرات اقتصادية واجتماعية على مجمل النشاط الاقتصادي .

     وفي بحثنا هذا سنركز على الآثار الاجتماعية لأدوات السياسة المالية (الإنفاق العام والإيراد العام) لما للتنمية الاجتماعية من أهمية متزايدة في عالمنا اليوم خاصة فيما يتعلق بمقوماتها غير المادية المتمثلة في خدما

The characteristics of physical architecture in the Levant and the island are characterized by a lot of attention and care, as they are a pillar of the urban movement in every place and time.

The study aimed at recognizing the availability of the cultural intelligence dimensions in social studies book at the high school in the kingdom of Saudi Arabia (curricula system- joint program). The study used the descriptive approach and content analysis method. As tools of the study, the study adopted a list of cultural list of indicators and dimensions that suits the secondary stage social curricula. It further adopted a content analysis form designed to analyze the social studies book in the secondary school in the kingdom of Saudi Arabia. The study has reached several results, the most significant results were: There is a difference in including the cultural intelligence dimensions in social studies book at high school in the kingd

The provisions of the monkey in Islamic jurisprudence

The science of jurisprudence of the most honorable science, and engaged in the great reward with God Almighty; Today, they strive to highlight this tremendous wealth by searching for it, studying it, realizing it and presenting it to mankind for the purpose of benefiting from it.
   It is a blessing to me that guided me to write in jurisprudence on the subject: (Delayed dowry in Islamic jurisprudence) Islamic law has preserved the rights of the wife to her husband, which is a financial and moral right. It is one of the provisions of the marriage contract and not a health condition and therefore marriage is held without mentioning in the contract.

كان ومازال الجدل الفكري الدائر بما هو ديني ، قائم على أسس الشريعة الإسلامية من مفاهيم شتى، اوما هو مجرد ينتمي إلى خانة التنظير الفلسفي والفكري الذي لا تحكمه أي أيديولوجية دينية وإنما يحكمه نتاج فكري بشري قد ينتمي إلى تيار فكري معين ( كالعلمانية) ، أو ( المادية) ، أو (الليبرالية). والذي يحكمنا في هذا البحث هو مفهوم " المعارضة" في الفكر السياسي الإسلامي المعاصر ، وكيف يمكن النظر إليه

The subject of divine attributes is one of the most important Islamic tenets, which must be
To stand up to its accuracy and multiplicity unlike the difference of speech, which led the teams to disbelieve
The other, when they were engaged in the issue of divine attributes, but they are agreed and assembled on
That God is one in himself and his qualities and actions. It is not similar to Himself and does not have two qualities of sex
One . It has no similar or real similarity between its qualities and the qualities of the creatures, as well as the acts of God
God is one in His actions and does not share it with anyone, and they have based their consensus on belief
In the unity of God and the unification of Raboubiya and t

The difference and pluralism among members of the same society is a fact undeniable and ignored, passed by the Quran, and confirmed by the Sunnah of the Prophet Mohammed in more than one occasion, so that the Apostle r placed a document included in its terms an agreement with the Jews, and recognized the coexistence between Muslims and Jews, which stems from the great principle of a tolerance, which recognizes the rights of others and the freedom to believe what is believed to be right, so it was incumbent upon us, and we live in rivalry repulsion and jealousies to recognize the principle of coexistence with the other, and accept it in accordance with the legitimate controls with pride of belonging to the Islamic religion, in this sense

Tribute in Islamic economical system was considered one of the matters that took great importance where there put for it many jurisdictions that organize its work and the tribute was considered one of the permanent income for the state and the tribute had direct benefits for the life of the people where with the increasing differences in the