The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Xiangdong Gao - One of the best experts on this subject based on the ideXlab platform.
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catalytic synthesis and structural characteristics of high quality tetrapod like zno nanocrystals by a modified vapor Transport Process
Crystal Growth & Design, 2005Co-Authors: Xiangdong GaoAbstract:High-quality tetrapod-like ZnO (T-ZnO) nanocrystals were synthesized by a modified vapor Transport Process. NiO nanocrystals were prepared on a Si substrate as a catalyst. High-yield zinc vapor was produced by a carbothermal reduction of zinc carbonate to promote the synthesis of T-ZnO nanocrystals. The as-grown T-ZnO nanocrystals are assembled by four hexagonal prismatic nanorods, whose diameters and lengths are 80−100 and 600−1000 nm, respectively. In the center of a T-ZnO nanocrystal, a tetrahedral core and several irregular patches were found among the nanorods. As a whole, T-ZnO nanocrystals are preferentially arranged along the 〈001〉 direction of ZnO. The photoluminescence spectrum of T-ZnO nanocrystals showed two emission bands, a strong ultraviolet emission at around 390 nm and a weak blue emission at 440 nm. The green light emission that is related to the existence of the defects in ZnO crystals cannot be distinguished. It implies that the high crystal integrity of T-ZnO nanocrystals has been obt...
Md Imran H Khan - One of the best experts on this subject based on the ideXlab platform.
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fundamental understanding of cellular water Transport Process in bio food material during drying
Scientific Reports, 2018Co-Authors: Md Imran H Khan, Troy W Farrell, Szilvia Anett Nagy, M A KarimAbstract:Bio-food materials are heterogeneous in structure with cellular diversity, where the majority of the water is located in the intracellular spaces. Understanding of the nature of the microscopic behaviour of water Transport is crucial to enhance the energy efficiency in food Processing and obtain the better quality of Processed food. In this research, apoplastic and symplastic Transport of cellular water in the bio-food material during drying was investigated using 1H-NMR-T2 relaxometry. We found that intracellular water (ICW) migrates from intracellular spaces to the intercellular spaces by progressive rupturing the cell membranes while drying at a higher temperatures (60 °C–70 °C). In this case, apoplastic Process dominates the Transport Process. However, at lower temperature (45 °C), cell membranes do not rupture and therefore ICW migrates from cell to the neighbouring cell through micro-capillaries, where the symplastic Process dominates the mass transfer at different stages of drying.
Evan A. Variano - One of the best experts on this subject based on the ideXlab platform.
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Overlooked methane Transport Process controls significant portion of a wetland's methane emissions
Geophysical Research Letters, 2016Co-Authors: Cristina Poindexter, Dennis D. Baldocchi, Jaclyn Hatala Matthes, Sara H. Knox, Evan A. VarianoAbstract:Wetland methane Transport Processes affect what portion of methane produced in wetlands reaches the atmosphere. We model what has been perceived to be the least important of these Transport Processes: hydrodynamic Transport of methane through wetland surface water and show that its contribution to total methane emissions from a temperate freshwater marsh is surprisingly large. In our 1 year study, hydrodynamic Transport comprised more than half of nighttime methane fluxes and was driven primarily by water column thermal convection occurring overnight as the water surface cooled. Overall, hydrodynamic Transport was responsible for 32% of annual methane emissions. Many methane models have overlooked this Process, but our results show that wetland methane fluxes cannot always be accurately described using only other Transport Processes (plant-mediated Transport and ebullition). Modifying models to include hydrodynamic Transport and the mechanisms that drive it, particularly convection, could help improve predictions of future wetland methane emissions.
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The contribution of an overlooked Transport Process to a wetland's methane emissions
Geophysical Research Letters, 2016Co-Authors: Cristina Poindexter, Dennis D. Baldocchi, Jaclyn Hatala Matthes, Sara H. Knox, Evan A. VarianoAbstract:Wetland methane Transport Processes affect what portion of methane produced in wetlands reaches the atmosphere. We model what has been perceived to be the least important of these Transport Processes: hydrodynamic Transport of methane through wetland surface water and show that its contribution to total methane emissions from a temperate freshwater marsh is surprisingly large. In our 1 year study, hydrodynamic Transport comprised more than half of nighttime methane fluxes and was driven primarily by water column thermal convection occurring overnight as the water surface cooled. Overall, hydrodynamic Transport was responsible for 32% of annual methane emissions. Many methane models have overlooked this Process, but our results show that wetland methane fluxes cannot always be accurately described using only other Transport Processes (plant-mediated Transport and ebullition). Modifying models to include hydrodynamic Transport and the mechanisms that drive it, particularly convection, could help improve predictions of future wetland methane emissions.
M A Karim - One of the best experts on this subject based on the ideXlab platform.
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fundamental understanding of cellular water Transport Process in bio food material during drying
Scientific Reports, 2018Co-Authors: Md Imran H Khan, Troy W Farrell, Szilvia Anett Nagy, M A KarimAbstract:Bio-food materials are heterogeneous in structure with cellular diversity, where the majority of the water is located in the intracellular spaces. Understanding of the nature of the microscopic behaviour of water Transport is crucial to enhance the energy efficiency in food Processing and obtain the better quality of Processed food. In this research, apoplastic and symplastic Transport of cellular water in the bio-food material during drying was investigated using 1H-NMR-T2 relaxometry. We found that intracellular water (ICW) migrates from intracellular spaces to the intercellular spaces by progressive rupturing the cell membranes while drying at a higher temperatures (60 °C–70 °C). In this case, apoplastic Process dominates the Transport Process. However, at lower temperature (45 °C), cell membranes do not rupture and therefore ICW migrates from cell to the neighbouring cell through micro-capillaries, where the symplastic Process dominates the mass transfer at different stages of drying.
M C Zarnstorff - One of the best experts on this subject based on the ideXlab platform.
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Ion Transport Process around magnetic axis in tokamaks
Physics of Plasmas, 1997Co-Authors: Ker-chung Shaing, Richard D Hazeltine, M C ZarnstorffAbstract:Ion Transport in the region close to the magnetic axis in tokamaks is investigated by solving the drift kinetic equation with the proper orbit topology taken into account. It is found that ion thermal conductivity remains finite in that region. The scaling of the thermal conductivity can be understood in terms of a random walk Process in units of the poloidal flux.
