Results 41 to 50 of about 391,526 (305)

A fully conjugated meso-boron-substituted porphyrinoid combining Lewis acidity with redox-switchable aromaticity

Nature Communications
The structural motif of porphyrin is relevant for many essential biological processes and has emerged as a versatile component of functional materials. Here, we introduce a thiophene-based porphyrinogen having electron-deficient boron atoms in all four ...
Manuel Buckel, Jonas Klopf, Johannes S. Schneider, Artur Lik, Nicolas A. Riensch, Ivo Krummenacher, Holger Braunschweig, Bernd Engels, Holger Helten   +8 more
doaj   +1 more source

A New Class of Boron Nanotube

, 2011
The configurations, stability and electronic structures of a new class of boron sheet and related boron nanotubes are predicted within the framework of density functional theory. This boron sheet is sparser than those of recent proposals.
Baughman, Boustani, Boustani, Boustani, Cabria, Chacko, Ciuparu, Gonzalez Szwacki, Grimes, Iijima, Kiran, Kresse, Kresse, Kresse, Kresse, Kroto, Kunstmann, Lau, Lee, Monkhorst, Mukhopadhyay, Perdew, Quandt, Singh, Tang, Vanderbilt, Xu, Yang, Zhai   +28 more
core   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

Meristic and biometric parameters of spined loach, Cobitis taenia (L.) (Cypriniformes, Cobitidae) from Zegrzyński Dam Reservoir [PDF]

Acta Ichthyologica et Piscatoria, 1994
The paper presents the results of studies on meristic and biometric parameters in spined loach, Cobitis taenia (L.) from Zegrzyński Dam Reservoir. Body proportions were determined as well as the relations between the parameters under study and body and ...
A. Boroń
doaj   +3 more sources

Interaction between Molten Al‐Killed Mn–B Steel and Carbon‐Bonded MgO Refractories Based on Recyclates

Advanced Engineering Materials, EarlyView.
High‐temperature interactions between low‐sulfur Al‐killed Mn–B steel and MgO–C refractories (0 and 50 wt% recyclates) are studied via finger immersion tests (1600 °C). Surface‐active elements influence infiltration. MgO/CaS layer forms, along with spinel and calcium silicate.
Matheus Roberto Bellé, Lukas Neubert, Anton Yehorov, Till M. J. Stadtmüller, Christos G. Aneziris, Olena Volkova   +5 more
wiley   +1 more source

A Thermodynamic 3D Model for the Simulation of Diffusion‐Controlled Alloying Processes in Heterogeneous Material Structures

Advanced Engineering Materials, EarlyView.
A numerical model resulting from irreversible thermodynamics for describing transport processes is introduced, focusing on thermodynamic activity gradients as the actual driving force for diffusion. Implemented in CUDA C++ and using CalPhaD methods for determining the necessary activity data, the model accurately simulates interdiffusion in aluminum ...
Ulrich Holländer, Leonhard Holländer, André Langohr, Hans Jürgen Maier   +3 more
wiley   +1 more source

Gamma ray attenuation behaviors and mechanism of boron rich slag/ epoxy resin shielding composites

Nuclear Engineering and Technology, 2023
Excellent thermal neutron absorption performance of boron expands the potential use of boron rich slag to prepare epoxy resin matrix nuclear shielding composites. However, shielding attenuation behaviors and mechanism of the composites against gamma rays
Mengge Dong, Suying Zhou, He Yang, Xiangxin Xue   +3 more
doaj   +1 more source

Broad boron sheets and boron nanotubes: An ab initio study of structural, electronic, and mechanical properties

, 2006
Based on a numerical ab initio study, we discuss a structure model for a broad boron sheet, which is the analog of a single graphite sheet, and the precursor of boron nanotubes.
Alexander Quandt, I. Boustani, Jens Kunstmann, L. Pauling, N. G. Chopra, P. J. Lin-Chung, R. Saito   +6 more
core   +1 more source

Thermophysical Properties of the Desulphurization Slags With Various CaS and CaO/Al2O3 Ratio

Advanced Engineering Materials, EarlyView.
This article investigates how CaS content and the CaO/Al2O3 ratio influence the thermophysical properties of desulphurization slags. Using experimental measurements and thermodynamic simulations, this study reveals complex effects on viscosity, surface tension, and density, providing new insight into slag structure and phase behavior under ...
Eldar Salpagarov, Matheus Roberto Bellé, Anton Yehorov, Julia Richter, Olena Volkova   +4 more
wiley   +1 more source

Boron-enhanced diffusion of boron from ultralow-energy boron implantation [PDF]

, 1998
The authors have investigated the diffusion enhancement mechanism of BED (boron enhanced diffusion), wherein the boron diffusivity is enhanced three to four times over the equilibrium diffusivity at 1,050 C in the proximity of a silicon layer containing a high boron concentration.
Agarwal, A., Eaglesham, D.J., Gossmann, H.J., Pelaz, L., Herner, S.B., Jacobson, D.C., Haynes, T.E., Erokhin, Y.E.   +7 more
openaire   +2 more sources