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اطلاعات دوره: 
  • سال: 

    2025
  • دوره: 

    12
  • شماره: 

    4
  • صفحات: 

    54-65
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    0
  • دانلود: 

    0
چکیده: 

In the present study, a novel combined process of severe plastic deformation (SPD) process was introduced, and its effects on the flow behavior, workability, and mechanical properties of commercially pure titanium were investigated through a single-pass billet deformation. The process consists of three sequential stages: primary cyclic extrusion compression (CEC), equal channel angular pressing (ECAP), and final extrusion. The results showed that the average hardness of the annealed, as-received specimens was 14 HRC on the section perpendicular to the movement axis. This value increased to 21 HRC, 26 HRC, and 29.5 HRC in samples processed by ECAP, CECAP, and the New CECAP process, respectively. These results demonstrate the superior effectiveness of the New CECAP process in enhancing hardness. Moreover, the findings revealed that the New CECAP process improves the strain distribution compared to CECAP and ECAP, with maximum strain increasing by up to 15% and 23%, respectively.

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نویسندگان: 

Qasemi Firouzabadi Narges | Rahimi Sayyidah Vahideh | Rahman Setayesh Muhammad Kazem

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    20
  • شماره: 

    37
  • صفحات: 

    239-268
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    175
  • دانلود: 

    17
چکیده: 

How to profoundly change the beliefs of the polytheists during the age of revelation from the denial of the Prophet (pbuh) to the certainty of his Message and the acceptance of his full guardianship is a question worthy of attention. The order of verses about prophecy based on the order of revelation is the reason to lead a transformative process and a special Quranic method in institutionalizing the belief of prophecy in the lives of Arabs. In the first stage, the Holy Quran in the first Makkī (Arabic: المکّیّ, suras revealed in Mecca) chapters has prepared the community from the motivational side to accept the truth of the Prophet’s (pbuh) prophecy and briefly stating the key issues surrounding it. The Holy Book of Quran at the time of the emergence of oppositions and doubts (the second stage) destroyed the arguments of the polytheists and explained the prophecy and proved its authenticity from a cognitive perspective in the second stage by presenting clear arguments. and the Holy Book of Quran in the third stage after Madanī (Arabic: المدنیّ, suras revealed in Medina) period has undertaken measures in order to fulfill the goals of the Massage by explaining the true position of the Prophet (pbuh) to deepen and operationalize the Prophetic belief through explaining practical duties for the Prophet (pbuh) and behavior based on the acceptance of Walaya (Arabic: ولایة, meaning “guardianship” or “governance”).

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اطلاعات دوره: 
  • سال: 

    2023
  • دوره: 

    10
  • شماره: 

    3
  • صفحات: 

    25-35
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    29
  • دانلود: 

    0
چکیده: 

Cyclic extrusion compression angular pressing (CECAP) is a novel severe plastic deformation (SPD) method applied to improve the mechanical and metallurgical properties of materials. In this research, finite element analysis and response surface method were considered for CP-Ti in CECAP process. Temperature, input extrusion diameter, exit extrusion angle, shear factor and longitudinal distance of input extrusion to the ECAP region were selected as input parameters to study strain distribution in the current process. The analysis of variance (ANOVA) was developed for current work, and the results showed that input parameters of input extrusion diameter and shear factor, and the interaction of the temperature and longitudinal distance of input extrusion to ECAP region, and the shear factor and longitudinal distance of input extrusion to ECAP region considerably affect the strain distribution. Hardness measurement in section A at the points near the center and outer surfaces of the sample showed the hardness of 21 and 24 HRC respectively. At this point, the maximum difference for hardness was achieved at about 12% throughout the cross section which is in suitable agreement with the strain distribution model. Moreover, the optical microscope (OM), both current CDECAP and conventional CECAP, showed that the majority of deformed grains were enlarged. The average deformed grain size for the current CECAP was reduced to 100 nm, which is considerably smaller than the conventional CECAP with an average grain size of 300 nm. Furthermore, the load-stroke diagram was achieved by executing experimental tests and comparing the results achieved the numerical model. The results showed a good agreement between them.

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    1385
  • دوره: 

    2
تعامل: 
  • بازدید: 

    563
  • دانلود: 

    269
چکیده: 

مدیریت زنجیره تامین در نیمه دوم قرن گذشته توسعه فراوانی یافته و در قرن حاضر نیز این توسعه ادامه داشته است. یکی از زمینه هایی که امروزه مورد توجه فراوان قرار گرفته است، توسعه و انطباق روش های کنترل تولید و موجودی با فلسفه تولید بهنگام در سطح خطوط تولیدی و به منظور کنترل مناسب جریان مواد و محصولات در سطح زنجیره تامین است. به همین منظور در این مقاله سعی میشود تا سیاست کششی- فشاری کار در جریان ثابت(CONWIP)  با شرایط زنجیره تامین تطبیق داده شده و در انتها مدل فوق بهینه سازی گردد. در فرآیند بهینه سازی نیز با توجه به ماهیت پیچیده زنجیره تامین، از روش بهینه سازی شبیه سازی و الگوریتمهای ژنتیک و جستجوی محلی هدایت شده استفاده خواهد شد که انعطاف پذیری فراوانی را به منظور حل مساله دارا می باشند. در انتها نیز نتایج اجرای مدل مورد بررسی و تحلیل قرار خواهد گرفت.

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نویسندگان: 

نشریه: 

Environ Proces

اطلاعات دوره: 
  • سال: 

    1396
  • دوره: 

    4
  • شماره: 

    3
  • صفحات: 

    563-572
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    156
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 156

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    20
  • شماره: 

    37
  • صفحات: 

    181-211
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    148
  • دانلود: 

    13
چکیده: 

Resistance is one of the fundamental Quranic values in the cause of the development of the Islamic society and the formation of the Islamic civilization, which means standing and resisting against something has upset the balance in internal and external dimensions. The formation of this value in the society as one of the methods of the conventional model of human life in the fields of human life; So that its manifestation can be observed in the totality of social behaviors, it is called the culture of resistance (Problem statement). The purpose of this article is the achievement of the engineering process of this value in a society based on the growth-oriented thought (ideological) system of the Holy Quran (Purpose). Now the question is what process does the Holy Quran propose in order to engineer the culture of resistance in the society? (Question). The necessity of examining this issue is clear considering the emphasis of religious teachings on this value and the need for Islamic societies, especially considering the current conditions of Islam and the need for convergence and coordination between the resistance front (Necessity). The research method in stating the engineering process and its components is qualitative content analysis with an analogy approach (Method). The findings of the research show that the engineering process of resistance culture is based on a self-awareness and purposefulness, according to the idea of Quranic growth, in a three-stage process that leads to the happiness of man and human society (Conclusion).

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نویسندگان: 

Kafi Mousavi Abazar

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    20
  • شماره: 

    37
  • صفحات: 

    269-292
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    104
  • دانلود: 

    12
چکیده: 

Every single word and sentence of eloquent words have been selected and arranged in a purposeful and logical way. The Quranic researchers have sought to discover the way of relation and the philosophy of the arrangement (order and formation) of the Qur'anic verses since the Quran is the most eloquent word. The process (semantic relations) is also defined in this way in order to provide a simple understanding of how the verses of the Qur'anic chapters are related. The content of each sura is divided into several semantic domains and the relationship between these relations is examined based on this new process. In this paper, the process (semantic relations) is adapted to the two suras (Arabic: سورة, chapters) of Ash-Shams (Arabic: الشمس) and al-Layl (Arabic: اللیل) in a descriptive analytical method to find an answer to the question of how the application of the process of semantic relations leads to the discovery of the textual coherence of Suras Ash-Shams and al-Layl. Finally, it is concluded that there is a central semantic relation in each of these two surahs that the rest of the relations are arranged in different methods of expressing in order to prove or believability and better understanding of that central meaning.

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