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https://www.readbyqxmd.com/read/28441328/a-gradient-field-pulsed-eddy-current-probe-for-evaluation-of-hidden-material-degradation-in-conductive-structures-based-on-lift-off-invariance
#1
Yong Li, Haoqing Jing, Ilham Mukriz Zainal Abidin, Bei Yan
Coated conductive structures are widely adopted in such engineering fields as aerospace, nuclear energy, etc. The hostile and corrosive environment leaves in-service coated conductive structures vulnerable to Hidden Material Degradation (HMD) occurring under the protection coating. It is highly demanded that HMD can be non-intrusively assessed using non-destructive evaluation techniques. In light of the advantages of Gradient-field Pulsed Eddy Current technique (GPEC) over other non-destructive evaluation methods in corrosion evaluation, in this paper the GPEC probe for quantitative evaluation of HMD is intensively investigated...
April 25, 2017: Sensors
https://www.readbyqxmd.com/read/28439560/direct-4d-printing-via-active-composite-materials
#2
Zhen Ding, Chao Yuan, Xirui Peng, Tiejun Wang, H Jerry Qi, Martin L Dunn
We describe an approach to print composite polymers in high-resolution three-dimensional (3D) architectures that can be rapidly transformed to a new permanent configuration directly by heating. The permanent shape of a component results from the programmed time evolution of the printed shape upon heating via the design of the architecture and process parameters of a composite consisting of a glassy shape memory polymer and an elastomer that is programmed with a built-in compressive strain during photopolymerization...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28430478/premelting-hcp-to-bcc-transition-in-beryllium
#3
Y Lu, T Sun, Ping Zhang, P Zhang, D-B Zhang, R M Wentzcovitch
Beryllium (Be) is an important material with wide applications ranging from aerospace components to x-ray equipment. Yet a precise understanding of its phase diagram remains elusive. We have investigated the phase stability of Be using a recently developed hybrid free energy computation method that accounts for anharmonic effects by invoking phonon quasiparticles. We find that the hcp → bcc transition occurs near the melting curve at 0<P<11  GPa with a positive Clapeyron slope of 41±4  K/GPa, which is more consistent with recent experimental measurements...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28417847/this-month-in-aerospace-medicine-history
#4
(no author information available yet)
No abstract text is available yet for this article.
May 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28402596/from-two-to-three-dimensional-structures-of-a-supertetrahedral-boran-using-density-functional-calculations
#5
Iliya V Getmanskii, Ruslan M Minyaev, Dmitrii V Steglenko, Vitaliy V Koval, Stanislav A Zaitsev, Vladimir I Minkin
With help of the DFT calculations and imposing of periodic boundary conditions the geometrical and electronic structures were investigated of two- and three-dimensional boron systems designed on the basis of graphane and diamond lattices in which carbons were replaced with boron tetrahedrons. The consequent studies of two- and three-layer systems resulted in the construction of a three-dimensional supertetrahedral borane crystal structure. The two-dimensional supertetrahedral borane structures with less than seven layers are dynamically unstable...
April 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28401243/two-shell-structured-pmaa-ceo2-nanocontainers-loaded-with-2-mercaptobenzothiazole-for-corrosion-protection-of-damaged-epoxy-coated-aa-2024-t3
#6
A C Balaskas, T Hashimoto, M Curioni, G E Thompson
In this work, novel two-shell structured inhibitor-loaded poly(methacrylic acid)@cerium oxide (PMAA@CeO2) nanocontainers were synthesised and characterized. The purpose of the nanocontainers is to increase the corrosion protection provided by an epoxy coating applied to an aerospace alloy (AA 2024-T3). The (PMAA@CeO2) nanocontainers with diameters of 550 nm were synthesised by a four-step process with the method of distillation precipitation polymerization for the synthesis of the inner PMAA layer, and the sol-gel method for the development of the outer CeO2 layer...
April 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28384612/a-review-on-thermal-and-catalytic-pyrolysis-of-plastic-solid-waste-psw
#7
REVIEW
S M Al-Salem, A Antelava, A Constantinou, G Manos, A Dutta
Plastic plays an important role in our daily lives due to its versatility, light weight and low production cost. Plastics became essential in many sectors such as construction, medical, engineering applications, automotive, aerospace, etc. In addition, economic growth and development also increased our demand and dependency on plastics which leads to its accumulation in landfills imposing risk on human health, animals and cause environmental pollution problems such as ground water contamination, sanitary related issues, etc...
April 3, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28372630/this-month-in-aerospace-medicine-history
#8
(no author information available yet)
No abstract text is available yet for this article.
February 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28372400/the-bepicolombo-laser-altimeter-bela-power-converter-module-pcm-concept-and-characterisation
#9
J Rodrigo, E Gasquet, J-M Castro, M Herranz, L-M Lara, M Muñoz, A Simon, T Behnke, N Thomas
This paper presents the principal considerations when designing DC-DC converters for space instruments, in particular for the power converter module as part of the first European space laser altimeter: "BepiColombo Laser Altimeter" on board the European Space Agency-Japan Aerospace Exploration Agency (JAXA) mission BepiColombo. The main factors which determine the design of the DC-DC modules in space applications are printed circuit board occupation, mass, DC-DC converter efficiency, and environmental-survivability constraints...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28368338/electronic-noses-for-composites-surface-contamination-detection-in-aerospace-industry
#10
Saverio De Vito, Maria Lucia Miglietta, Ettore Massera, Grazia Fattoruso, Fabrizio Formisano, Tiziana Polichetti, Maria Salvato, Brigida Alfano, Elena Esposito, Girolamo Di Francia
The full exploitation of Composite Fiber Reinforced Polymers (CFRP) in so-called green aircrafts design is still limited by the lack of adequate quality assurance procedures for checking the adhesive bonding assembly, especially in load-critical primary structures. In this respect, contamination of the CFRP panel surface is of significant concern since it may severely affect the bonding and the mechanical properties of the joint. During the last years, the authors have developed and tested an electronic nose as a non-destructive tool for pre-bonding surface inspection for contaminants detection, identification and quantification...
April 2, 2017: Sensors
https://www.readbyqxmd.com/read/28360122/increased-cerebral-blood-volume-pulsatility-during-head-down-tilt-with-elevated-carbon-dioxide-the-spacecot-study
#11
Gary E Strangman, Quan Zhang, Karina Marshall-Goebel, Edwin Mulder, Brian Stevens, Jonathan B Clark, Eric M Bershad
Astronauts aboard the International Space Station (ISS) have exhibited hyperopic shifts, posterior eye globe flattening, dilated optic nerve sheaths, and even optic disc swelling from spaceflight. Elevated intracranial pressure (ICP) consequent to cephalad fluid shifts is commonly hypothesized as contributing to these ocular changes. Head-down tilt (HDT) is frequently utilized as an Earth-based analog to study similar fluid shifts. Sealed environments like the ISS also exhibit elevated carbon dioxide (CO2), a potent arteriolar vasodilator that could further affect cerebral blood volume and flow, intracranial compliance, and ICP...
March 30, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28358194/new-scalable-approach-toward-shape-memory-polymer-composites-via-spring-buckle-microstructure-design
#12
Xiaodong Wu, Yangyang Han, Zehang Zhou, Xinxing Zhang, Canhui Lu
Shape memory polymers (SMPs) have attracted tremendous research interest since their discovery. However, most advances in research of SMPs are based on molecular designs, i.e., "bottom-up" strategies. Due to the viscoelasticity of polymers, slow and incomplete shape variations are inevitable for most existing SMPs. Here, we propose a simple and scalable approach to design and fabricate SMP composites (SMPCs) based on a "spring-buckle" microstructure design. Specifically, a highly elastic "spring" is employed as a basic skeleton for the SMPCs, onto which self-adhesive and stimuli-responsive "buckles" are installed as reversible switch units...
April 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350452/velcro-inspired-sic-fuzzy-fibers-for-aerospace-applications
#13
Amelia H C Hart, Ryota Koizumi, John Hamel, Peter Samora Owuor, Yusuke Ito, Sehmus Ozden, Sanjit Bhowmick, Syed Asif Syed Amanulla, Thierry Tsafack, Kunttal Keyshar, Rahul Mital, Janet Hurst, Robert Vajtai, Chandra Sekhar Tiwary, Pulickel M Ajayan
The most recent and innovative silicon carbide (SiC) fiber ceramic matrix composites, used for lightweight high-heat engine parts in aerospace applications, are woven, layered, and then surrounded by a SiC ceramic matrix composite (CMC). To further improve both the mechanical properties and thermal and oxidative resistance abilities of this material, SiC nanotubes and nanowires (SiCNT/NWs) are grown on the surface of the SiC fiber via carbon nanotube conversion. This conversion utilizes the shape memory synthesis (SMS) method, starting with carbon nanotube (CNT) growth on the SiC fiber surface, to capitalize on the ease of dense surface morphology optimization and the ability to effectively engineer the CNT-SiC fiber interface to create a secure nanotube-fiber attachment...
April 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28346208/basics-of-compounding-3d-printing-pharmacy-applications-part-1
#14
Loyd V Allen
Three-dimensional printing quickly became a standard tool in the automotive, aerospace, and consumer goods industries and, recently, has begun gaining traction in pharmaceutical manufacturing. 3D printing has steadily grown, introducing a new element into dosage form development, and has received a boost with U.S. Food and Drug Administration (FDA) approval of the 3D-printed orodispersible tablet, Spritam (levetiracetam). This part 1 of a 3-part article introduces 3D printing and its application to pharmacy...
March 2017: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28335360/super-hydrophobic-icephobic-coatings-based-on-silica-nanoparticles-modified-by-self-assembled-monolayers
#15
Junpeng Liu, Zaid A Janjua, Martin Roe, Fang Xu, Barbara Turnbull, Kwing-So Choi, Xianghui Hou
A super-hydrophobic surface has been obtained from nanocomposite materials based on silica nanoparticles and self-assembled monolayers of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS) using spin coating and chemical vapor deposition methods. Scanning electron microscope images reveal the porous structure of the silica nanoparticles, which can trap small-scale air pockets. An average water contact angle of 163° and bouncing off of incoming water droplets suggest that a super-hydrophobic surface has been obtained based on the silica nanoparticles and POTS coating...
December 2, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335316/polymer-nanocomposite-film-with-metal-rich-surface-prepared-by-in-situ-single-step-formation-of-palladium-nanoparticles-an-interesting-way-to-combine-specific-functional-properties
#16
David Thompson, David Kranbuehl, Eliane Espuche
This paper presents a continuous single-step route that permits preparation of a thermostable polymer/metal nanocomposite film and to combine different functional properties in a unique material. More precisely, palladium nanoparticles are in situ generated in a polyimide matrix thanks to a designed curing cycle which is applied to a polyamic acid/metal precursor solution cast on a glass plate. A metal-rich surface layer which is strongly bonded to the bulk film is formed in addition to homogeneously dispersed metal nanoparticles...
October 18, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28323596/this-month-in-aerospace-medicine-history
#17
(no author information available yet)
No abstract text is available yet for this article.
December 1, 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28323581/the-asma-and-the-european-congress-of-aerospace-medicine
#18
David P Gradwell
No abstract text is available yet for this article.
December 1, 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28322343/unprecedented-simultaneous-enhancement-in-damage-tolerance-and-fatigue-resistance-of-zirconia-ta-composites
#19
A Smirnov, J I Beltrán, T Rodriguez-Suarez, C Pecharromán, M C Muñoz, J S Moya, J F Bartolomé
Dense (>98 th%) and homogeneous ceramic/metal composites were obtained by spark plasma sintering (SPS) using ZrO2 and lamellar metallic powders of tantalum or niobium (20 vol.%) as starting materials. The present study has demonstrated the unique and unpredicted simultaneous enhancement in toughness and strength with very high flaw tolerance of zirconia/Ta composites. In addition to their excellent static mechanical properties, these composites also have exceptional resistance to fatigue loading. It has been shown that the major contributions to toughening are the resulting crack bridging and plastic deformation of the metallic particles, together with crack deflection and interfacial debonding, which is compatible with the coexistence in the composite of both, strong and weak ceramic/metal interfaces, in agreement with predictions of ab-initio calculations...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28279249/bylaws-of-the-aerospace-medical-association
#20
(no author information available yet)
No abstract text is available yet for this article.
March 1, 2017: Aerospace Medicine and Human Performance
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