Erratum to: Energy Aspects of Technological Inheritance of Aircraft Metal Parts

the role of russia in transmission of energy from central asia and caucuses to european union

پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...

(Erratum): Evaluation of Various Biological Activities of the Aerial Parts of Scrophularia frigida Growing in Iran.

Erratum to: Limit computable integer parts

We address an error in the original paper [1]. Proposition 3.1 in [1] was incorrect as stated. In particular, the purported implications 2 =⇒ 1 and 3 =⇒ 1 are false; there exists a real closed field R, a Z-ring I ⊂ R, and a ∈ R − I such that p(a) is infinite or in Z for all p(x) ∈ I[x], but there is no Z-ring J such that I ⊂ J ⊂ R and a ∈ J . We thank Emil Jeřábek [2] for pointing out the error...

(Erratum): Evaluation of Various Biological Activities of the Aerial Parts of Scrophularia frigida Growing in Iran.

Investigation of hot metal gas forming process of square parts

Aluminum alloys are considered a lot in the automotive and aerospace industry because of their high strength to weight ratio. In this manuscript, the gas forming process of aluminum AA6063 tubes at high temperatures up to 500°C is investigated, through experimental and numerical tests. Therefore, an experimental setup is prepared and so, tube specimens are formed in a die with square cross sect...