Zobrazeno 1 - 10
of 344
pro vyhledávání: '"David Rafaja"'
Publikováno v:
Open Ceramics, Vol 19, Iss , Pp 100634- (2024)
This study presents a data-driven framework based on machine learning (ML) using extreme gradient boosting (XGBoost) for predicting the hardness of silicon nitride (Si3N4) ceramics reinforced with graphene. The XGBoost model takes into account variou
Externí odkaz:
https://doaj.org/article/0b75db10b0504e29890f101dc558b1fd
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-14 (2023)
Abstract Magnetic properties of superparamagnetic iron oxide nanoparticles are controlled mainly by their particle size and by their particle size distribution. Magnetic properties of multi-core iron oxide nanoparticles, often called iron oxide nanof
Externí odkaz:
https://doaj.org/article/01a969f6c3054b49a8d0a633f6fd0d4e
Autor:
Libang Lai, Jann-Erik Brandenburg, Paul Chekhonin, Arnaud Duplessi, Fabien Cuvilly, Auriane Etienne, Bertrand Radiguet, David Rafaja, Frank Bergner
Publikováno v:
Metals, Vol 14, Iss 3, p 257 (2024)
Ion irradiation combined with nanoindentation is a promising tool for studying irradiation-induced hardening of nuclear materials, including reactor pressure vessel (RPV) steels. For RPV steels, the major sources of hardening are nm-sized irradiation
Externí odkaz:
https://doaj.org/article/731bf3e973004d59a6c79ee747ca27bc
Publikováno v:
Engineering Reports, Vol 4, Iss 7-8, Pp n/a-n/a (2022)
Abstract Formation of hot cracks in alloys is a critical issue for their production and processing. In this study, the susceptibility of the cast Mg97Y2Zn1 alloy containing long period stacking ordered (LPSO) structures to hot cracking was investigat
Externí odkaz:
https://doaj.org/article/4d4acd504b9045a18e23b5ea66919c98
Autor:
Anke Dalke, Tom Weinhold, Alexander Schramm, Christina Wüstefeld, Ulrike Ratayski, Vjaceslav Sochora, Horst Biermann, David Rafaja
Publikováno v:
Engineering Reports, Vol 4, Iss 7-8, Pp n/a-n/a (2022)
Abstract A duplex treatment consisting of plasma nitriding (PN) and physical vapor deposition (PVD) significantly improves the thermal, tribological, and corrosion resistance of forming tools, and especially if they are intended for applications subj
Externí odkaz:
https://doaj.org/article/1dca62f55c864630869775eb9aa612bc
Autor:
Ulrike Ratayski, Christian Schimpf, Christina Wüstefeld, Anke Dalke, Horst Biermann, David Rafaja
Publikováno v:
Engineering Reports, Vol 4, Iss 7-8, Pp n/a-n/a (2022)
Abstract The stability of an iron nitride compound layer prepared by plasma nitriding of AISI D2 tool steel is investigated using in situ high‐temperature X‐ray diffraction at rising temperature up to 470°C and for an isothermal treatment at 450
Externí odkaz:
https://doaj.org/article/615a9801065840b2826d6f3b62ca02e0
Publikováno v:
Engineering Reports, Vol 4, Iss 7-8, Pp n/a-n/a (2022)
Externí odkaz:
https://doaj.org/article/d4521f30e190462f9929ce8bf52a13d6
Publikováno v:
IUCrJ, Vol 6, Iss 1, Pp 116-127 (2019)
The defect structure of γ-Al2O3 derived from boehmite was investigated using a combination of selected-area electron diffraction (SAED) and powder X-ray diffraction (XRD). Both methods confirmed a strong dependence of the diffraction line broadening
Externí odkaz:
https://doaj.org/article/a0b20bc31c8c4f43bf8bc43c176cd2ab
Autor:
Monika Gwoździk, Christiane Ullrich, Christian Schimpf, David Rafaja, Sławomir Kulesza, Mirosław Bramowicz
Publikováno v:
Bulletin of the Polish Academy of Sciences: Technical Sciences, Vol 69, Iss 4 (2021)
This paper presents the results of diagnostic examinations conducted on the coils of super-heaters made of 10CrMo9‒10 steel that were operated in industrial conditions at 480°C for 130 thousand hours. The tube was exposed in a coal-fired boiler. T
Externí odkaz:
https://doaj.org/article/5e1531de539846b9ac0de110f864c419
Autor:
Alina Schramm, Martin Thümmler, Olga Fabrichnaya, Simon Brehm, Jakob Kraus, Jens Kortus, David Rafaja, Christiane Scharf, Christos G. Aneziris
Publikováno v:
Crystals, Vol 12, Iss 5, p 654 (2022)
The aim of this study is the investigation of a technological synthesis of MgAlON, which is a prospective coating material on ceramic foam filters for the filtration of magnesium, aluminum, and other metal melts. Thermodynamic calculations are perfor
Externí odkaz:
https://doaj.org/article/8c21d513075f4a91aaefe9763cf61767