作者：
Krook, Nadia M.Leblon, CourtneyJedlicka, Sabrina S.Lehigh University
Advanced Materials and Nanotechnology Bethlehem PA 18015 United States Lehigh University
Materials Science and Engineering Center for Advanced Materials and Nanotechnology Bethlehem PA 18015 United States Lehigh University
Mechanical Engineering and Mechanics Center for Advanced Materials and Nanotechnology Bethlehem PA 18015 United States Lehigh University
Bioengineering Program Center for Advanced Materials and Nanotechnology Bethlehem PA 18015 United States
Poly(glycerol sebacate) (PGS) is a biodegradable and biocompatible elastomer that has been used in a wide range of biomedical applications. While a porous format is common for tissue engineering scaffolds, to allow ce...
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Two‐dimensional boron materials have recently attracted extensive theoretical interest because of their exceptional structural complexity and remarkable physical and chemical properties. However, such 2D boron monola...
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Two‐dimensional boron materials have recently attracted extensive theoretical interest because of their exceptional structural complexity and remarkable physical and chemical properties. However, such 2D boron monolayers have still not been synthesized. In this report, the synthesis of atomically thin 2D γ‐boron films on copper foils is achieved by chemical vapor deposition using a mixture of pure boron and boron oxide powders as the boron source and hydrogen gas as the carrier gas. Strikingly, the optical band gap of the boron film was measured to be around 2.25 eV, which is close to the value (2.07 eV) determined by first‐principles calculations, suggesting that the γ‐B 28 monolayer is a fascinating direct band gap semiconductor. Furthermore, a strong photoluminescence emission band was observed at approximately 626 nm, which is again due to the direct band gap. This study could pave the way for applications of two‐dimensional boron materials in electronic and photonic devices.
This paper proposes an orientation measurement method of a novel permanent magnet spherical actuator with 3D magnet array based on several hall sensors. This measurement method could avoid additional inertial moment a...
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This paper proposes an orientation measurement method of a novel permanent magnet spherical actuator with 3D magnet array based on several hall sensors. This measurement method could avoid additional inertial moment and friction, as there is no contact between the measurement system and the rotor. And the accuracy of Hall sensors could be enhanced by the higher flux density produced by the 3D magnet array. A novel distribution of Hall sensors is proposed in this paper. Compared with the magnetic field model formulated analytically, the rotor orientation could be derived from the measured value of flux density by these Hall sensors. Numerical computation is utilized to validate the accuracy of the analytical equations between the orientation of rotor and the measured value of Hall sensors. Also the numerical computation shows that the accuracy of the orientation measurement method is influenced by the 3D magnet array. These researches could be used for subsequent control implementation of the novel permanent magnet spherical actuator.
The present work is focused on the microstructure and mechanical properties of Ti14 alloy with different semisolid deformation ratios during forging tests. The results revealed that the forging ratio had a significant...
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The present work is focused on the microstructure and mechanical properties of Ti14 alloy with different semisolid deformation ratios during forging tests. The results revealed that the forging ratio had a significant effect on the precipitation of the alloy. Fewer plate-shaped Ti2Cu tended to precipitate on grain boundaries with higher forging ratios, and finally the plate-shaped Ti2Cu formed precipitate-free zones along grain boundaries with a forging ratio of 75%. The precipitation on grain boundaries was found to be controlled by a peritectic reaction. Large forging ratios accelerated the extrusion of liquid and resulted in less liquid along the prior grain boundaries, which reduced the peritectic precipitation in this region and formed precipitate-free zones during re-solidification. In addition, increasing the forging ratio could accelerate dynamic recrystallization, which is favorable for improving the semisolid formability. The tensile ductility increased with increasing forging ratio, and a mixed fracture mode, involving both cleavage and dimple fracture, was observed after forging with a forging ratio of 75%, which along grain boundaries during semisolid processing. is attributed to the presence of precipitate-free zones formed
A novel p-n junction photocatalyst of Bi4Ti3O 12 nanofibers-BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reacti...
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Microstructure and mechanical performances of the coarse grain heat-affected-zone （CGHAZ） for oil tank steel with different Ti content were investigated through Gleeble-3500, scanning electron microscopy, transmissi...
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Microstructure and mechanical performances of the coarse grain heat-affected-zone （CGHAZ） for oil tank steel with different Ti content were investigated through Gleeble-3500, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometer. The results show that the strength and low- temperature toughness of base material are significantly improved for the high titanium content steel, but the impact toughness of CGHAZ is seriously deteriorated after the high heat input welding and declined sharply with the heat input increasing, while the effects of heat input on impact toughness are very weak for the low titanium content steel, impact toughness of which is gradually larger than that of high titanium content steel with the welding heat input increasing because of the granular bainite increasing, TiN particle coarsening, and （Ti, Nb） N composition evolution during the high input welding for high titanium content steel.
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