The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
Bn Prichard - One of the best experts on this subject based on the ideXlab platform.
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Mechanical engineering upgrades to the DARHT-II induction cells
Digest of Technical Papers-IEEE International Pulsed Power Conference, 2007Co-Authors: Juan Barraza, T. Hg, K Chow, V. Smith, M. Kang, David Munson, C Peters, K. Nielsen, Bn PrichardAbstract:Recent performance and reliability upgrades to the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility second axis induction cells: have impacted various: cell Mechanical components. To attain a higher level of performance and reliability, key Mechanical elements: comprising the induction cells were redesigned. These elements include the oil-vacuum insulator assembly, cathode cap, oil and vacuum region cell extension hardware, induction cores' insulating, material and configuration, and the high voltage drive plate. While developing these upgrades, other enhancements, unrelated to the electrical performance, were implemented as well. These enhancements include the solenoid assembly oilwater interface, the oil plumbing and ventilation, and the vacuum bellows assembly, Mechanical processes were also developed to attain high assembly quality during the cell refurbishment process. This paper presents and discusses each Mechanical Attribute associated with these upgrades of the DARHT second axis induction cells. © 2005 IEEE.
Luiz Henrique Capparelli Mattoso - One of the best experts on this subject based on the ideXlab platform.
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Chitosan nanoparticles on the improvement of thermal, barrier, and Mechanical properties of high- and low-methyl pectin films
Food Hydrocolloids, 2016Co-Authors: Marcos Vinicius Lorevice, Márcia Regina De Moura, Caio Gomide Otoni, Luiz Henrique Capparelli MattosoAbstract:Non-biodegradable food packaging materials have caused serious environmental problems due to their inappropriate discard. Biodegradable and renewable polymers (e.g., polysaccharides), when reinforced with nanostructures, have been used to produce novel, eco-friendly food packaging as alternatives to replace conventional packaging. This study aimed at adding chitosan nanoparticles (CSNPs) to high- (HDM) and low-methyl (LDM) pectin matrices to produce HDM pectin/CSNP and LDM pectin/CSNP nanocomposite films, as well as at evaluating the effect of CSNPs on films' Mechanical, thermal, and barrier properties. Also, CSNPs were characterized as to zeta potential, average diameter, and FT-IR, whereas nanocomposites' thickness, appearance, structure, morphology, Mechanical, thermal, and barrier properties were analyzed. CSNPs presented average diameter and zeta potential near to 110 nm and 50 mV, respectively. The addition of CSNPs improved the Mechanical properties, being tensile strength the most affected Mechanical Attribute (increased from 30.81 to 46.95 MPa and from 26.07 to 58.51 MPa for HDM pectin/CSNP and LDM pectin/CSNP, respectively). These results show that the produced pectin/CSNPs nanocomposites had improved Mechanical properties when compared with control pectin films, making these novel materials promising for food packaging production.
Juan Barraza - One of the best experts on this subject based on the ideXlab platform.
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Mechanical engineering upgrades to the DARHT-II induction cells
Digest of Technical Papers-IEEE International Pulsed Power Conference, 2007Co-Authors: Juan Barraza, T. Hg, K Chow, V. Smith, M. Kang, David Munson, C Peters, K. Nielsen, Bn PrichardAbstract:Recent performance and reliability upgrades to the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility second axis induction cells: have impacted various: cell Mechanical components. To attain a higher level of performance and reliability, key Mechanical elements: comprising the induction cells were redesigned. These elements include the oil-vacuum insulator assembly, cathode cap, oil and vacuum region cell extension hardware, induction cores' insulating, material and configuration, and the high voltage drive plate. While developing these upgrades, other enhancements, unrelated to the electrical performance, were implemented as well. These enhancements include the solenoid assembly oilwater interface, the oil plumbing and ventilation, and the vacuum bellows assembly, Mechanical processes were also developed to attain high assembly quality during the cell refurbishment process. This paper presents and discusses each Mechanical Attribute associated with these upgrades of the DARHT second axis induction cells. © 2005 IEEE.
Francisco Monroy - One of the best experts on this subject based on the ideXlab platform.
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Direct Cytoskeleton Forces Cause Membrane Softening in Red Blood Cells
Biophysical Journal, 2015Co-Authors: Ruddi Rodríguez-garcía, Iván López-montero, Michael Mell, Gustavo Egea, Francisco MonroyAbstract:Erythrocytes are flexible cells specialized in the systemic transport of oxygen in vertebrates. This physiological function is connected to their outstanding ability to deform in passing through narrow capillaries. In recent years, there has been an influx of experimental evidence of enhanced cell-shape fluctuations related to metabolically driven activity of the erythroid membrane skeleton. However, no direct observation of the active cytoskeleton forces has yet been reported to our knowledge. Here, we show experimental evidence of the presence of temporally correlated forces superposed over the thermal fluctuations of the erythrocyte membrane. These forces are ATP-dependent and drive enhanced flickering motions in human erythrocytes. Theoretical analyses provide support for a direct force exerted on the membrane by the cytoskeleton nodes as pulses of well-defined average duration. In addition, such metabolically regulated active forces cause global membrane softening, a Mechanical Attribute related to the functional erythroid deformability.
Marcos Vinicius Lorevice - One of the best experts on this subject based on the ideXlab platform.
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Chitosan nanoparticles on the improvement of thermal, barrier, and Mechanical properties of high- and low-methyl pectin films
Food Hydrocolloids, 2016Co-Authors: Marcos Vinicius Lorevice, Márcia Regina De Moura, Caio Gomide Otoni, Luiz Henrique Capparelli MattosoAbstract:Non-biodegradable food packaging materials have caused serious environmental problems due to their inappropriate discard. Biodegradable and renewable polymers (e.g., polysaccharides), when reinforced with nanostructures, have been used to produce novel, eco-friendly food packaging as alternatives to replace conventional packaging. This study aimed at adding chitosan nanoparticles (CSNPs) to high- (HDM) and low-methyl (LDM) pectin matrices to produce HDM pectin/CSNP and LDM pectin/CSNP nanocomposite films, as well as at evaluating the effect of CSNPs on films' Mechanical, thermal, and barrier properties. Also, CSNPs were characterized as to zeta potential, average diameter, and FT-IR, whereas nanocomposites' thickness, appearance, structure, morphology, Mechanical, thermal, and barrier properties were analyzed. CSNPs presented average diameter and zeta potential near to 110 nm and 50 mV, respectively. The addition of CSNPs improved the Mechanical properties, being tensile strength the most affected Mechanical Attribute (increased from 30.81 to 46.95 MPa and from 26.07 to 58.51 MPa for HDM pectin/CSNP and LDM pectin/CSNP, respectively). These results show that the produced pectin/CSNPs nanocomposites had improved Mechanical properties when compared with control pectin films, making these novel materials promising for food packaging production.