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https://www.readbyqxmd.com/read/28546911/graphene-based-polymer-bilayers-with-superior-light-driven-properties-for-remote-construction-of-3d-structures
#1
Zhenhua Tang, Ziwei Gao, Shuhai Jia, Fei Wang, Yonglin Wang
3D structure assembly in advanced functional materials is important for many areas of technology. Here, a new strategy exploits IR light-driven bilayer polymeric composites for autonomic origami assembly of 3D structures. The bilayer sheet comprises a passive layer of poly(dimethylsiloxane) (PDMS) and an active layer comprising reduced graphene oxides (RGOs), thermally expanding microspheres (TEMs), and PDMS. The corresponding fabrication method is versatile and simple. Owing to the large volume expansion of the TEMs, the two layers exhibit large differences in their coefficients of thermal expansion...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28539157/this-month-in-aerospace-medicine-history
#2
(no author information available yet)
No abstract text is available yet for this article.
June 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28518016/this-month-in-aerospace-medicine-history
#3
(no author information available yet)
No abstract text is available yet for this article.
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28518015/this-month-in-aerospace-medicine-history
#4
(no author information available yet)
No abstract text is available yet for this article.
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28466566/origami-metamaterials-for-tunable-thermal-expansion
#5
Elisa Boatti, Nikolaos Vasios, Katia Bertoldi
Materials with engineered thermal expansion, capable of achieving targeted area/volume changes in response to variations in temperature, are important for a number of aerospace, optical, energy, and microelectronic applications. While most of the proposed structures with engineered coefficient of thermal expansion consist of bi-material 2D or 3D lattices, here it is shown that origami metamaterials also provide a platform for the design of systems with a wide range of thermal expansion coefficients. Experiments and simulations are combined to demonstrate that by tuning the geometrical parameters of the origami structure and the arrangement of plates and creases, an extremely broad range of thermal expansion coefficients can be obtained...
May 3, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28464661/sound-transmission-loss-characteristics-of-sandwich-panels-with-a-truss-lattice-core
#6
S Ehsan Moosavimehr, A Srikantha Phani
Sandwich panels are extensively used in constructional, naval, and aerospace structures due to the high stiffness and strength-to-weight ratios. In contrast, the sound transmission properties are adversely influenced by the low effective mass. Phase velocity matching of structural waves propagating within the panel and the incident pressure waves from the fluid medium leads to coincidence effects resulting in reduced impedance and high sound transmission. Truss-like lattice cores with porous microarchitecture and reduced inter panel connectivity offer the potential to satisfy the conflicting structural and vibroacoustic response requirements...
April 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28463328/synthetic-aperture-imaging-in-astronomy-and-aerospace-introduction
#7
Michelle J Creech-Eakman, P Scott Carney, David F Buscher, Michael Shao
Aperture synthesis methods allow the reconstruction of images with the angular resolutions exceeding that of extremely large monolithic apertures by using arrays of smaller apertures together in combination. In this issue we present several papers with techniques relevant to amplitude interferometry, laser radar, and intensity interferometry applications.
May 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28463292/investigation-on-vibration-excitation-of-debonded-sandwich-structures-using-time-average-digital-holography
#8
Binu P Thomas, S Annamala Pillai, C S Narayanamurthy
Sandwich structures, in the modern aerospace industry, are more sought after due to their high strength to stiffness ratio resulting in significant weight gains. Optical techniques like time-average holography and shearography are preferred in industries for inspection of huge sandwich and composite panels because of whole-field (full coverage) inspection in a lesser time leading to large savings in cost. These techniques conventionally use sinusoidal frequency sweep to capture the local resonance of defective regions...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28458742/composites-of-aluminum-alloy-and-magnesium-alloy-with-graphite-showing-low-thermal-expansion-and-high-specific-thermal-conductivity
#9
Valerio Oddone, Benji Boerner, Stephanie Reich
High thermal conductivity, low thermal expansion and low density are three important features in novel materials for high performance electronics, mobile applications and aerospace. Spark plasma sintering was used to produce light metal-graphite composites with an excellent combination of these three properties. By adding up to 50 vol.% of macroscopic graphite flakes, the thermal expansion coefficient of magnesium and aluminum alloys was tuned down to zero or negative values, while the specific thermal conductivity was over four times higher than in copper...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/28456244/inline-screw-feeding-vacuum-arc-thruster
#10
Igal Kronhaus, Matteo Laterza, Yonatan Maor
A new type of micropropulsion device for nanosatellite applications is presented-the inline-screw-feeding vacuum-arc thruster (ISF-VAT). This thruster couples a conventional "triggerless" ignition geometry with a feeding mechanism that maintains a steady state discharge performance. The feeding mechanism implements a screw action on a central cathode rod. At a predetermined rate, a complete and uniform erosion of the cathodes tip is obtained as well as "healing" of the insulator coating. The inline feeding of the cathode forces the arc to emerge on the tip of the cathode, flush with the exit plane of the anode...
April 2017: Review of Scientific Instruments
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
#11
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
#12
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
#13
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
#14
(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
#15
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
#16
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...
May 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28384612/a-review-on-thermal-and-catalytic-pyrolysis-of-plastic-solid-waste-psw
#17
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
#18
(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
#19
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
#20
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
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