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Laura Silvestroni, Hans-Joachim Kleebe, William G Fahrenholtz, Jeremy Watts
Ceramics based on group IV-V transition metal borides and carbides possess melting points above 3000 °C, are ablation resistant and are, therefore, candidates for the design of components of next generation space vehicles, rocket nozzle inserts, and nose cones or leading edges for hypersonic aerospace vehicles. As such, they will have to bear high thermo-mechanical loads, which makes strength at high temperature of great importance. While testing of these materials above 2000 °C is necessary to prove their capabilities at anticipated operating temperatures, literature reports are quite limited...
January 19, 2017: Scientific Reports
(no author information available yet)
No abstract text is available yet for this article.
February 1, 2017: Aerospace Medicine and Human Performance
Yury Minenkov, Valery V Sliznev, Luigi Cavallo
Accurate gas phase formation enthalpies, ΔHf, of metal oxides and halides are critical for the prediction of the stability of high temperature materials used in the aerospace and nuclear industries. Unfortunately, the experimental ΔHf values of these compounds in the most used databases, such as the NIST-JANAF database, are often reported with large inaccuracy, while some other ΔHf values clearly differ from the value predicted by CCSD(T) methods. To address this point, in this work we systematically predicted the ΔHf values of a series of these compounds having a group 4, 6, or 14 metal...
January 17, 2017: Inorganic Chemistry
Yang Wang, Hao Yuan, Piming Ma, Huiyu Bai, Mingqing Chen, Weifu Dong, Yi Xie, Yogesh S Deshmukh
Natural nacre is well-known by its unique properties due to the well-recognized "brick and mortar" structure. Inspired by the natural nacre, graphene oxide (GO) was modified with dopamine in aqueous solution and then chemically reduced to yield polydopamine-capped reduce GO (PDG). The artificial nacre films of poly(vinyl alcohol) (PVA) and PDG presentating layered structure had been successfully constructed via vacuum-assisted assembly process, in which PDG and PVA acted as "bricks" and "mortar", respectively...
January 17, 2017: ACS Applied Materials & Interfaces
Kiran Shahzadi, Imran Mohsin, Lin Wu, Xuesong Ge, Yijun Jiang, Hui Li, Xindong Mu
Demands for high strength integrated materials have substantially increased across various kinds of industries. Inspired by the relationship of excellent integration of mechanical properties and hierarchical nano/microscale structure of the natural nacre, a simple and facile method to fabricate high strength integrated artificial nacre based on sodium carboxymethylcellulose (CMC) and borate cross-linked graphene oxide (GO) sheets has been developed. The tensile strength and toughness of cellulose-based hybrid material reached 480...
January 11, 2017: ACS Nano
Vahid Fartashvand, Amir Abdullah, Seyed Ali Sadough Vanini
Titanium has widely been used in chemical and aerospace industries. In order to overcome the drawbacks of cold compaction of titanium, the process was assisted by an ultrasonic vibration system. For this purpose, a uniaxial ultrasonic assisted cold powder compaction system was designed and fabricated. The process variables were powder size, compaction pressure and initial powder compact thickness. Density, friction force, ejection force and spring back of the fabricated samples were measured and studied. The density was observed to improve under the action of ultrasonic vibration...
May 2017: Ultrasonics Sonochemistry
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2017: Aerospace Medicine and Human Performance
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2017: Aerospace Medicine and Human Performance
Marla J De Jong, Susan F Dukes, Karey M Dufour, Darcy L Mortimer
BACKGROUND: The clinical experience and preferred learning style of U.S. Air Force flight nurses and aeromedical evacuation technicians are unknown. METHODS: Using a cross-sectional survey design, we gathered data regarding the clinical experience, level of comfort providing clinical care, and preferred learning style of 77 active duty (AD), Air Force Reserve (AFR), and Air National Guard (ANG) nurses enrolled in the U.S. Air Force School of Aerospace Medicine Flight Nurse course, and 121 AD, AFR, and ANG medical technicians enrolled in the Aeromedical Evacuation Technician course...
January 1, 2017: Aerospace Medicine and Human Performance
Jarrod C Williams, Baochau N Nguyen, Linda McCorkle, Daniel Scheiman, Justin S Griffin, Stephen A Steiner, Mary Ann B Meador
We report here the fabrication of polyamide aerogels composed of poly-p-phenylene-terephthalamide, the same backbone chemistry as DuPont's Kevlar. The all-para-substituted polymers gel without the use of cross-linker and maintain their shape during processing-an improvement over the meta-substituted cross-linked polyamide aerogels reported previously. Solutions containing calcium chloride (CaCl2) and para-phenylenediamine (pPDA) in N-methylpyrrolidinone (NMP) at low temperature are reacted with terephthaloyl chloride (TPC)...
January 18, 2017: ACS Applied Materials & Interfaces
Du Zhou, Xi Yuan, Haoxiang Gao, Ailing Wang, Jun Liu, Omer El Fakir, Denis J Politis, Liliang Wang, Jianguo Lin
The use of Finite Element (FE) simulation software to adequately predict the outcome of sheet metal forming processes is crucial to enhancing the efficiency and lowering the development time of such processes, whilst reducing costs involved in trial-and-error prototyping. Recent focus on the substitution of steel components with aluminum alloy alternatives in the automotive and aerospace sectors has increased the need to simulate the forming behavior of such alloys for ever more complex component geometries...
December 13, 2016: Journal of Visualized Experiments: JoVE
Wei Liu, Yang Zhang, Fan Yang, Peng Gao, Zhiguang Lan, Zhenyuan Jia, Hang Gao
High-accuracy surface measurement of large aviation parts is a significant guarantee of aircraft assembly with high quality. The result of boundary measurement is a significant parameter for aviation-part measurement. This paper proposes a measurement method for accurately measuring the surface and boundary of aviation part with feature compression extraction and directed edge-point criterion. To improve the measurement accuracy of both the surface and boundary of large parts, extraction method of global boundary and feature analysis of local stripe are combined...
December 26, 2016: Sensors
Wonmo Kang, Marriner Merrill, Jeffrey M Wheeler
The advance of micro/nanotechnology in energy-harvesting, micropower, electronic devices, and transducers for automobile and aerospace applications has led to the need for accurate thermomechanical characterization of micro/nano-scale materials to ensure their reliability and performance. This persistent need has driven various efforts to develop innovative experimental techniques that overcome the critical challenges associated with precise mechanical and thermal control of micro/nano-scale specimens during material characterization...
December 23, 2016: Nanoscale
Georgi T Georgiev, James J Butler, Kurt Thome, Catherine Cooksey, Leibo Ding
Satellite instruments operating in the reflected solar wavelength region require accurate and precise determination of the optical properties of their diffusers used in pre-flight and post-flight calibrations. The majority of recent and current space instruments use reflective diffusers. As a result, numerous Bidirectional Reflectance Distribution Function (BRDF) calibration comparisons have been conducted between the National Institute of Standards and Technology (NIST) and other industry and university-based metrology laboratories...
2016: Proceedings of SPIE
Juan Laguardia, Emilio Rubio, Ana Garcia, Rafael Garcia-Foncillas
Labour risk prevention is an activity integrated within Safety and Hygiene at Work in Spain. In 2003, the Electronic Declaration for Accidents at Work, Delt@ (DELTA) was introduced. The industrial aerospace sector is subject to various risks. Our objective is to analyse the Spanish Industrial Aerospace Sector (SIAS) using the ACSOM methodology to assess its labour risks and to prioritise preventive actions. The SIAS and the Services Subsector (SS) were created and the relevant accident rate data were obtained...
October 2016: Anais da Academia Brasileira de Ciências
M Arul Kumar, I J Beyerlein, R J McCabe, C N Tomé
Materials with a hexagonal close-packed (hcp) crystal structure such as Mg, Ti and Zr are being used in the transportation, aerospace and nuclear industry, respectively. Material strength and formability are critical qualities for shaping these materials into parts and a pervasive deformation mechanism that significantly affects their formability is deformation twinning. The interaction between grain boundaries and twins has an important influence on the deformation behaviour and fracture of hcp metals. Here, statistical analysis of large data sets reveals that whether twins transmit across grain boundaries depends not only on crystallography but also strongly on the anisotropy in crystallographic slip...
December 19, 2016: Nature Communications
Chenyang Lu, Liangliang Niu, Nanjun Chen, Ke Jin, Taini Yang, Pengyuan Xiu, Yanwen Zhang, Fei Gao, Hongbin Bei, Shi Shi, Mo-Rigen He, Ian M Robertson, William J Weber, Lumin Wang
A grand challenge in material science is to understand the correlation between intrinsic properties and defect dynamics. Radiation tolerant materials are in great demand for safe operation and advancement of nuclear and aerospace systems. Unlike traditional approaches that rely on microstructural and nanoscale features to mitigate radiation damage, this study demonstrates enhancement of radiation tolerance with the suppression of void formation by two orders magnitude at elevated temperatures in equiatomic single-phase concentrated solid solution alloys, and more importantly, reveals its controlling mechanism through a detailed analysis of the depth distribution of defect clusters and an atomistic computer simulation...
December 15, 2016: Nature Communications
(no author information available yet)
Transitions of care (ToCs), also referred to as handoffs or sign-outs, occur when the responsibility for a patient's care transfers from 1 health care provider to another. Transitions are common in the acute care setting and have been noted to be vulnerable events with opportunities for error. Health care is taking ideas from other high-risk industries, such as aerospace and nuclear power, to create models of structured transition processes. Although little literature currently exists to establish 1 model as superior, multiorganizational consensus groups agree that standardization is warranted and that additional work is needed to establish characteristics of ToCs that are associated with clinical or practice outcomes...
November 2016: Pediatrics
Daxi Geng, Deyuan Zhang, Zhe Li, Dapeng Liu
The production of high quality bolt holes, especially on the carbon fiber reinforced plastics/titanium alloy (CFRP/Ti) stacks, is essential to the manufacturing process in order to facilitate part assembly and improve the component mechanical integrity in aerospace industry. Reaming is widely used as a mandatory operation for bolt holes to meet the strict industry requirements. In this paper, the ultrasonic elliptical vibration-assisted reaming (UEVR) which is considered as a new method for finish machining of CFRP/Ti stacked holes is studied...
March 2017: Ultrasonics
Bryan Oronsky, Ramasamy Paulmurugan, Kira Foygel, Jan Scicinski, Susan J Knox, Donna Peehl, Hongjuan Zhao, Shoucheng Ning, Pedro Cabrales, Thomas A Summers, Tony R Reid, William L Fitch, Michelle M Kim, Jane B Trepel, Min-Jung Lee, Santosh Kesari, Nacer D Abrouk, Regina M Day, Arnold Oronsky, Carolyn M Ray, Corey A Carterg
According to Hanahan and Weinberg, cancer manifests as six essential physiologic hallmarks: (1) self-sufficiency in growth signals, (2) insensitivity to growth-inhibitory signals, (3) evasion of programmed cell death, (4) limitless replicative potential, (5) sustained angiogenesis, and (6) invasion and metastasis. As a facilitator of these traits as well as immunosuppression and chemoresistance, the presence of tumor-associated macrophages (TAMs) may serve as the seventh hallmark of cancer. Anticancer agents that successfully reprogram TAMs to target rather than support tumor cells may hold the key to better therapeutic outcomes...
January 2017: Expert Opinion on Investigational Drugs
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