The Experts below are selected from a list of 5208 Experts worldwide ranked by ideXlab platform
Julcour Carine - One of the best experts on this subject based on the ideXlab platform.
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Definition and Exploration of the Integrated CO2 Mineralization Technological cycle
'Frontiers Media SA', 2020Co-Authors: Bourgeois Florent, Laniesse Priscillia, Cyr Martin, Julcour CarineAbstract:This paper is part of a multi-disciplinary research program on development and application of an integrated CO2 mineralization (ICM) framework for development of carbon mineralization as a CO2 mitigation solution. ICM is viewed as a three Concentric Layer system: technological, industrial integration, and decision-making. The search for viable ICM solutions in a given societal and economic context, which could be posed as an inverse design problem, begins with the identification and characterization of every system component. As an early writing on the development and applicability of the proposed ICM framework, this contribution focuses on ICM's inner technological Layer. Several technological pathways, each one defined as a set of processing and transformation steps that connect a feedstock to a specific marketable product, can coexist within this Layer. The paper addresses the characterization of one such technological pathway, whose cycle is divided into three successive blocks: feedstock, carbonation and valorization. The proposed concepts are illustrated through the valorization of ferronickel slag from New Caledonia as supplementary cementitious material or cement constituent, a case study that targets the production of “greener” construction materials. The data presented in the paper confirm the feasibility of characterizing the chosen ICM technological pathway, giving credit to the proposition that ICM can be approached as an inverse design problem. While exemplifying the significance of the characterization work necessary for one particular ICM technological pathway, the paper argues that development of ICM requires working on a scale considerably larger than that of standard mineral carbonation process research. Indeed, where grams of carbonated products are sufficient to investigate mineral carbonation processes, kilograms are mandatory to test and validate the use performance of final marketable products. Without precluding the merits of seeking innovative solutions, the authors argue that unit operations and transformation processes whose validity is proven at an industrial scale should be favored for timely development of viable ICM solutions
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Definition and Exploration of the Integrated CO2 Mineralization Technological Cycle
'Frontiers Media SA', 2020Co-Authors: Bourgeois Florent, Laniesse Priscillia, Cyr Martin, Julcour CarineAbstract:International audienceThis paper is part of a multi-disciplinary research program on development and application of an integrated CO2 mineralization (ICM) framework for development of carbon mineralization as a CO2 mitigation solution. ICM is viewed as a three Concentric Layer system: technological, industrial integration, and decision-making. The search for viable ICM solutions in a given societal and economic context, which could be posed as an inverse design problem, begins with the identification and characterization of every system component. As an early writing on the development and applicability of the proposed ICM framework, this contribution focuses on ICM's inner technological Layer. Several technological pathways, each one defined as a set of processing and transformation steps that connect a feedstock to a specific marketable product, can coexist within this Layer. The paper addresses the characterization of one such technological pathway, whose cycle is divided into three successive blocks: feedstock, carbonation and valorization. The proposed concepts are illustrated through the valorization of ferronickel slag from New Caledonia as supplementary cementitious material or cement constituent, a case study that targets the production of “greener” construction materials. The data presented in the paper confirm the feasibility of characterizing the chosen ICM technological pathway, giving credit to the proposition that ICM can be approached as an inverse design problem. While exemplifying the significance of the characterization work necessary for one particular ICM technological pathway, the paper argues that development of ICM requires working on a scale considerably larger than that of standard mineral carbonation process research. Indeed, where grams of carbonated products are sufficient to investigate mineral carbonation processes, kilograms are mandatory to test and validate the use performance of final marketable products. Without precluding the merits of seeking innovative solutions, the authors argue that unit operations and transformation processes whose validity is proven at an industrial scale should be favored for timely development of viable ICM solutions
Margit Zacharias - One of the best experts on this subject based on the ideXlab platform.
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transmission electron microscopy in situ fabrication of zno al2o3 composite nanotubes by electron beam irradiation induced local etching of zno al2o3 core shell nanowires
Small, 2008Co-Authors: Yang Yang, Roland Scholz, Andreas Berger, Dong Sik Kim, Mato Knez, D Hesse, U Gosele, Margit ZachariasAbstract:One-dimensional (1D) nanoscale heterocomposites are currently receiving much attention due to their tunable chemical reactivity and physical properties. An attractive approach for producing coaxial core/shell 1D nanoscale heterostructures involves coating the nanowires in a conformal metal-oxide Concentric Layer via atomic-Layer deposition (ALD). Encapsulation of ZnO nanowires by an ALD-deposited Al2O3 insulator Layer has been widely used to prepare ZnO/Al2O3 core/shell nanowires. [5–8] Such nanostructures attract particular interest because of their possible applications in dye-sensitized solar cells and in the fabrication of other functional nanomaterials, such as wall-thickness-controllable Al2O3 nanotubes [6] and well-crystallized 1D ZnAl2O4 nanostructures. [7,8] Transmission electron microscopy (TEM) imaging is one of the primary tools for assessing core/shell 1D nanoscale heterostructures. Differences in electron density in the samples lead to contrast changes in the TEM images, from which the coaxial core/shell structure of ZnO/Al2O3 nanowires can be confirmed. ZnO is usually considered a fairly stable material under electron-beam irradiation on account of its high decomposition temperature (1975 8C) and relatively high Zn–O bond energy (2.94 eV/284.1 kJ mol ). Moreover, ZnO presents very little redox activation in vacuum or atmosphere at moderate temperatures. Clear evidence of this stability was shown from studies of the structural degradation of ZnS nanotubes during electron-beam irradiation in a TEM
Katsuo Furukubotokunaga - One of the best experts on this subject based on the ideXlab platform.
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embryonic and larval development of the drosophila mushroom bodies Concentric Layer subdivisions and the role of fasciclin ii
Development, 2002Co-Authors: Mitsuhiko Kurusu, Kei Ito, Takeshi Awasaki, Liria M Masudanakagawa, Hiroshi Kawauchi, Katsuo FurukubotokunagaAbstract:Mushroom bodies (MBs) are the centers for olfactory associative learning and elementary cognitive functions in the arthropod brain. In order to understand the cellular and genetic processes that control the early development of MBs, we have performed high-resolution neuroanatomical studies of the embryonic and post-embryonic development of the Drosophila MBs. In the mid to late embryonic stages, the pioneer MB tracts extend along Fasciclin II (FAS II)-expressing cells to form the primordia for the peduncle and the medial lobe. As development proceeds, the axonal projections of the larval MBs are organized in Layers surrounding a characteristic core, which harbors bundles of actin filaments. Mosaic analyses reveal sequential generation of the MB Layers, in which newly produced Kenyon cells project into the core to shift to more distal Layers as they undergo further differentiation. Whereas the initial extension of the embryonic MB tracts is intact, loss-of-function mutations of fas II causes abnormal formation of the larval lobes. Mosaic studies demonstrate that FAS II is intrinsically required for the formation of the coherent organization of the internal MB fascicles. Furthermore, we show that ectopic expression of FAS II in the developing MBs results in severe lobe defects, in which internal Layers also are disrupted. These results uncover unexpected internal complexity of the larval MBs and demonstrate unique aspects of neural generation and axonal sorting processes during the development of the complex brain centers in the fruit fly brain.
Dong Cuilan - One of the best experts on this subject based on the ideXlab platform.
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steel wire diameter ratio calculation of 6 29fi wire rope strand
Metal Products, 2010Co-Authors: Dong CuilanAbstract:To do geometry analysis for 6×29Fi wire rope strand,the lay angle and helix radius of different Layer steel wire in strands are calculated according to cosine theorem,helix lay angle formula and helix radius formula of Concentric Layer steel wire.The curvature radius at steel wire ellipse section point of tangency are calculated according to steel wire ellipse arbitrariness radius formula,the results are:the steel wire diameter ratio from inner Layer to outer Layer is 1.4354∶1.0999∶0.4344∶1 at the state of non-twisting,the steel wire diameter ratio from inner Layer to outer Layer is 1.5389∶1.1503∶0.4534∶1.When lay pitch multiple of strands is at 7.0,7.5,8.0,8.5,9.0,9.5,the accurate steel wire diameter ratio every Layers are demonstrated,which used to guide wire matching calculation and production of wire rope.
Natalia M Litchinitser - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of a non resonant hyperlens in the visible spectral range
Nature Communications, 2015Co-Authors: Jingbo Sun, Mikhail I Shalaev, Natalia M LitchinitserAbstract:A metamaterial hyperlens offers a solution to overcome the diffraction limit by transforming evanescent waves responsible for imaging subwavelength features of an object into propagating waves. However, the first realizations of optical hyperlenses were limited by significant resonance-induced losses. Here we report the experimental demonstration of a non-resonant waveguide-coupled hyperlens operating in the visible wavelength range. A detailed investigation of various materials systems proves that a radial fan-shaped configuration is superior to the Concentric Layer-based configuration in that it relies on non-resonant negative dielectric response, and, as a result, enables low-loss performance in the visible range.
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experimental demonstration of non resonant hyperlens in the visible range
arXiv: Optics, 2014Co-Authors: Jingbo Sun, Mikhail I Shalaev, Natalia M LitchinitserAbstract:A metamaterial hyperlens offers a unique solution to overcome the diffraction limit by transforming evanescent waves responsible for imaging subwavelength features of an object into propagating waves. However, the first realizations of optical hyperlenses were limited by a narrow working bandwidth and significant resonance-induced loss. Here, we report the first experimental demonstration of a non-resonant waveguide-coupled hyperlens operating in the visible wavelength range. A detailed investigation of various materials systems proves that a radial fan-shaped configuration is superior to the Concentric Layer-based configuration in that it relies on non-resonant negative dielectric response, and, as a result, enables broadband and low-loss performance in the visible range.