Abstract Electron beam powder bed fusion (E-PBF) is a well-known additive manufacturing process. Components are realized based on layer-by-layer melting of metal powder. Due to the high degree design freedom, came into focus tooling industry, especially for tools with sophisticated internal cooling channels. The present work focuses relationships between processing, microstructure evolution, ch...

در صنعت پالایشگاه و پتروشیمی‌ها به دلیل وجود تجهیزات تمام فلزی محیط اسیدی خوردگیتنشی زیاد است با توجه افزایش کاربرد فولادهای زنگ نزن این صنایع پژوهش بررسی اثر ضربات امواج اولتراسونیک بر رفتار خوردگی فولاد 316 (S.S 316) می‌پردازیم. هدف از تأثیر روش تنش‌زدایی برافزایش مقاومت قطعات محیط‌های خورنده است. لازم ذکر که، تنش پسمان نمونه‌ها جوش‌کاری ایجادشده ابتدا نمونه مدنظر استفاده ارتعاش تحت فرکانس 20...

Twenty-three Hessian fly, Mayetiola destructor (Say), populations collected in the southeastern (Alabama and Mississippi), midwestern (Indiana), and northwestern (Idaho and Washington) United States from 1995 to 1999 were evaluated for biotype composition based on response to Hessian fly resistance genes H3, H5, H6, and H7H8 in wheat, Triticum aestivum L. Biotypes L and O, combined, made up at ...

influenza A subtypes in black-headed gulls to understand influenza disease dynamics M.J. Poen, J.H. Verhagen, F.A. Majoor, N.S. Lewis, T. Kuiken, M.C.M. De Jong, R.A.M. Fouchier, Department of Viroscience, Erasmus MC, Rotterdam, The Netherlands, Dutch Centre for Field Ornithology, Sovon, Nijmegen, The Netherlands, Department of Zoology, University of Cambridge, Cambridge, UK and Department Quan...

Abstract In the Old Testament, term ‘Lepra’ was used to describe many skin diseases, including psoriasis, eczema, vitiligo, alopecia areata and boils. The word ‘leprosy’ derived from this previously as a generic that included multiple inflammatory dermatological diseases. It disorder of great religious significance during ancient times, with intense stigmatization—‘lepers’ were pronounced uncle...

Recent studies have indicated that laser direct metal deposition can be used for repairing deep or internal cracks and defects in metallic components. In order to implement the method, it is necessary to machine a groove or slot to the depth of the defect and refill it. This work investigates advantages and potential problems with the technique and compares the results from using two different ...

Abstract: mechanical properties of AISIH 13 hot-work tool steel have been studied. Cast samples made of the modified new steel were homogenized and austenitized at different conditions, followed by tempering at the specified temperature ranges. Hardness, red hardness, three point bending test and Charpy impact test were carried out to evaluate the mechanical properties together with characteriz...