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Co-Re-based alloys a new class of material for gas turbine applications at very high temperatures
Mukherji, D.,Rosler, J.,Wehrs, J.,Eckerlebe, H.,Gilles, R. Techno-Press 2012 Advances in materials research Vol.1 No.3
Co-Re alloy development is prompted by the search for new materials for future gas turbines which can be used at temperatures considerably higher than the present day single crystal Ni-based superalloys. The Co-Re based alloys are designed to have very high melting range. Although Co-alloys are used in gas turbine applications today, the Co-Re system was never exploited for structural applications and basic knowledge on the system is lacking. The alloy development strategy therefore is based on studying alloying additions on simple model alloy compositions of ternary and quaternary base. Various strengthening possibilities have been explored and precipitation hardening through fine dispersion of MC type carbides was found to be a promising route. In the early stages of the development we are mainly dealing with polycrystalline alloys and therefore the grain boundary embrittlement needed to be addressed and boron addition was considered for improving the ductility. In this paper recent results on the effect of boron on the strength and ductility and the stability of the fine structure of the strengthening TaC precipitates are presented. In the beginning the alloy development strategy is briefly discussed.
Shintaro Okazaki,Angeles Navarro,Prokriti Mukherji,Kirk Plangger 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Quick Response (QR) code has often been employed in promotional coupon campaigns worldwide. This research addresses whether and how curiosity, visual complexity and perceived fit jointly affect consumers’ intention to scan such a code. Based on relevant theories from marketing and psychology, we posit that, while consumers with the high level of curiosity are likely to be more bound to visual complexity, consumers with the low level of curiosity tend to rely more on a good perceived fit, thus overcome the negative effects of visual complexity, forming greater scan intention. To this end, we conduct an experimental study with general consumer sample. The findings support our main prediction. In closing, we discuss theoretical and managerial implications while recognizing important limitations and suggesting future research directions.
Matrix Transformation in Boron Containing High-Temperature Co–Re–Cr Alloys
Pavel Strunz,Debashis Mukherji,Přemysl Beran,Ralph Gilles,Lukas Karge,Michael Hofmann,Markus Hoelzel,Joachim Rösler,Gergely Farkas 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
An addition of boron largely increases the ductility in polycrystalline high-temperature Co–Re alloys. Therefore, the effect ofboron on the alloy structural characteristics is of high importance for the stability of the matrix at operational temperatures. Volume fractions of ε (hexagonal close-packed—hcp), γ (face-centered cubic—fcc) and σ (Cr 2 Re 3 type) phases were measuredat ambient and high temperatures (up to 1500 °C) for a boron-containing Co–17Re–23Cr alloy using neutron diff raction. The matrix phase undergoes an allotropic transformation from ε to γ structure at high temperatures, similar to pure cobaltand to the previously investigated, more complex Co–17Re–23Cr–1.2Ta–2.6C alloy. It was determined in this study that thetransformation temperature depends on the boron content (0–1000 wt. ppm). Nevertheless, the transformation temperaturedid not change monotonically with the increase in the boron content but reached a minimum at approximately 200 ppm ofboron. A probable reason is the interplay between the amount of boron in the matrix and the amount of σ phase, which bindshcp-stabilizing elements (Cr and Re). Moreover, borides were identifi ed in alloys with high boron content.
Effect of Composition on the Matrix Transformation of the Co-Re-Cr-Ta-C Alloys
Přemysl Beran,Debashis Mukherji,Pavel Strunz,Ralph Gilles,Michael Hofmann,Lukas Karge,Oleksandr Dolotko,Joachim Rösler 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.4
Neutron diffraction measurement was performed in-situ at high temperatures on Co-Re-Ta-C alloys with and without Cr addition. This included alloys containing different C content with the C/Ta ratio varying between 0.5 and 1.0. The Co-Re-solid solution matrix of the experimental alloys is polymorphic (like in pure cobalt) and transformed from low temperature hexagonal ε phase to high temperature cubic γ phase on heating. This transformation is reversible and show hysteresis. The main alloying addition, Re, stabilizes the ε Co-phase and increases the transformation temperature to above 1273 K. The onset of the ε γ transformation during heating and cooling was found to differ depending on the alloy composition. In alloys without Cr addition the transformation was not completed on cooling and the high temperature γ phase was partly retained at room temperature in metastable state with the amount depending on the cooling rate from high temperature. The diffraction and microstructural results showed that Cr is ε stabilizer (similar as Re) but the role of Ta is not clear. The C/Ta ratio has no direct effect on the matrix phase transformation. Nevertheless, it influences indirectly by determining the amount of Ta which is freely available in the matrix.
Spin-offs, Fiduciary duty, and The Law
Adams, Edward S.,Mukherji, Arijit 東國大學校 大學院 法學科 商事法 2001 商事法 세미나 Vol.10 No.-
회사의 이사와 임원은 주주의 이익을 최대화할 신인의무를 가지고 있다. 그리고 많은 사례에서 spin-offs가 그러한 효과적인 수단이 될 수 있다는 것이 증명되었다. 하지만, 의회와 IRS는 제355조의 거래에 내재된 과세회피에 대해서 이상할 정도로 집착해왔다. 결과적으로 조세법과 관련된 재무성규칙과 판례는 경영진이 비과세를 의도로 하는 spin-offs를 이행하는 것을 불편하게 만들었다. 그와 같은 장애물은 잘못된 조세와 경제정책이며, 또한 불필요하기까지 한다. 부적당한 spin-offs에 대한 주주소송과 주의 사기양도금지법과 같은 다른 법적 보호수단이 경영진 자신의 은신처로 삼거나 불법행위 책임을 피하기 위해 경영진이 spin-off하는 것을 억제하기에 충분하다.
CONCEPTUALISATION OF AVATAR-ENABLED CONSUMER COMMUNICATIONS IN THE METAVERSE
Yue Peng,Shintaro Okazaki,Prokriti Mukherji 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
The metaverse has become a trendy topic for both academics and practitioners in recent years. While the metaverse is still in a developmental stage, it is anticipated that it will bring significant changes to the existing paradigm in marketing, information system, psychology and many other disciplines (Dwivedi et al., 2022)