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The biography of Amir Pazvari, the most famous vernacular poet of Mazandaran, is accompanied by many speculations due to the lack of documents in history and literature, and the attribution of collected Amiris to Amir Pazvari is also debatable. Therefore, this paper aims to provide a different representation of this vernacular poet and his poems by examining the studies conducted on Amir Pazvari and Amiri. Criticism and analysis in various studies show that due to the vagueness of the poet's life, the uncertainty of the time and place of his death, and the doubts about the accuracy or inaccuracy of the attribution to Pazvar, the identity of the poet who became famous as Pazvari should be viewed doubtfully. Since there is no historical document showing Amir to be from Pazvar, the last name Pazwari was replaced with Mazandarani due to laxity and negligence. Also, in the oldest and most detailed version found, there is no famous Amiri to be cited as a representation of the poet's origin in Pazvar. The Amiris collected in Kanzalasarar Mazandarani, which was later published under the name "Amir Pazvari Divan", are not composed by Amir Pazvari himself. The existence of poems by other poets with reference to Mazandarani's Kanzalasarar, the study of Amiri's stylistics, especially the contrast between the antiquity and the novelty of using verbs and words, the disagreement of researchers on the rhythm and format, as well as the difference in the number of Amiri's published, confirm this idea.
 

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از آنجا که معادلات سینماتیک و دینامیک وضعیت فضاپیما، معادلاتی غیرخطی هستند، برای کنترل در حالت واقعی‌تر باید از روش‌های کنترل غیرخطی استفاده ‌شود. روش پسگام یک تکنیک سیستماتیک بر پایه لیاپانوف برای طراحی کنترل‌های پایدار سیستم‌های دینامیکی غیر‌خطی می‌باشد. از آنجایی که در عمل شاهد حضور اغتشاشات و عدم قطعیت‌های مختلف در سیستم هستیم، نیاز است که کنترلر طراحی شده قابلیت مقاومت در برابر این عدم قطعیت‌ها و اغتشاشات را داشته باشد. بنابراین در اینگونه موارد، از روش بهبود یافته‌ای به نام پسگام مقاوم استفاده می‌شود که در آن یک ترم دمپینگ غیرخطی به کنترلر اضافه می‌شود تا بتواند در برابر اغتشاشات و عدم قطعیت‌های پارامتری سیستم مقاومت کند. در این مقاله، پس از استخراج معادلات سینماتیکی و دینامیکی فضاپیما بر حسب پارامترهای اصلاح شده رودریگز، با استفاده از روش پسگام استاندارد یک کنترلر پایدار وضعیت برای سیستم غیرخطی فضاپیما طراحی و پایداری آن توسط تئوری لیاپانوف اثبات می‌شود. سپس به منظور ایجاد مقاومت در سیستم در برابر عدم قطعیت در ماتریس اینرسی فضاپیما، با اضافه نمودن ترم دمپینگ غیرخطی به روش پسگام استاندارد، پسگام مقاوم بر روی سیستم معادلات فضاپیما پیاده‌سازی می‌شود. نتایج شبیه‌سازی، دقت تعقیب وضعیت و همچنین موفقیت‌آمیز بودن روش پسگام مقاوم برای مقاومت در برابر عدم قطعیت‌های پارامتری را نشان می‌دهند.

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Attitude control of spacecraft is one of the most important issues in aerospace. Different control method for this purpose were proposed that each of these controllers have different behavior against disturbances. One of these methods is backstepping which is divided to adaptive and nonadaptive techniques. Since the spacecraft equations are nonlinear, linear control methods will not work in this case so the nonlinear control methods should be used. The modular adaptive backstepping method is a nonlinear adaptive control method and has a parameter update law that we can use different estimators to estimate system’s unknown parameters in this method. It is also possible to reduce the differentiation load of virtual control laws by using the command filtering method. In this paper, contrary to other works which mostly use discrete command filtering method, we use continuous command filtering method which the natural frequency and damping coefficient can be determined to bring down the computation of the time derivatives of virtual controls laws to differentiation. In this paper, after deriving spacecraft equations in terms of Modified Rodrigues Parameters, we design two stable attitude controllers for spacecraft using standard and command filtered modular adaptive backstepping methods and prove the stability of system using the Lyapunov theory and then simulation results of these controllers are compared with each other. Simulation results show good attitude tracking accuracy and success of adaptive backstepping method in having robustness against disturbance torque is proved