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Stephen J Mihailov, Dan Grobnic, Cyril Hnatovsky, Robert B Walker, Ping Lu, David Coulas, Huimin Ding
The femtosecond laser-induced fiber Bragg grating is an effective sensor technology that can be deployed in harsh environments. Depending on the optical fiber chosen and the inscription parameters that are used, devices suitable for high temperature, pressure, ionizing radiation and strain sensor applications are possible. Such devices are appropriate for aerospace or energy production applications where there is a need for components, instrumentation and controls that can function in harsh environments. This paper will present a review of some of the more recent developments in this field...
December 14, 2017: Sensors
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2018: Aerospace Medicine and Human Performance
Pamela C Day
Day PC. Results of AMHP journal survey on Open Access. Aerospace Med Hum Perform. 2018; 89(1):70-71.
January 1, 2018: Aerospace Medicine and Human Performance
Shan-Bin Sun, Yuan-Yuan He, Si-Da Zhou, Zhen-Jiang Yue
Measurement of dynamic responses plays an important role in structural health monitoring, damage detection and other fields of research. However, in aerospace engineering, the physical sensors are limited in the operational conditions of spacecraft, due to the severe environment in outer space. This paper proposes a virtual sensor model with partial vibration measurements using a convolutional neural network. The transmissibility function is employed as prior knowledge. A four-layer neural network with two convolutional layers, one fully connected layer, and an output layer is proposed as the predicting model...
December 12, 2017: Sensors
Jianxing Liu, Yihui Zhang
Auxetic materials with negative Poisson's ratios have important applications across a broad range of engineering areas, such as biomedical devices, aerospace engineering and automotive engineering. A variety of design strategies have been developed to achieve artificial auxetic materials with controllable responses in the Poisson's ratio. The development of designs that can offer isotropic negative Poisson's ratios over large strains can open up new opportunities in emerging biomedical applications, which, however, remains a challenge...
December 11, 2017: Soft Matter
Ruth A Miller, Brett A Cruden, Ramon Martinez, Debbie G Senesky
Gallium nitride (GaN)-on-sapphire photodetectors are used to measure the ultraviolet (UV) radiance behind a shock wave in support of atmospheric entry sensing technologies. DC spectral response characterization of the GaN-based photodetectors shows a peak response around 365 nm with an UV/visible rejection of an order of magnitude. To conduct in situ measurements of UV shock-layer radiation, the GaN-based photodetectors were installed, without protective packaging, in the test section of a shock tube. The measured UV radiation, in terms of incident optical power on the photodetectors, is in excellent agreement with average UV radiation measured by the shock tube facility spectrometers...
November 2017: Review of Scientific Instruments
Adnan Kefal, Mehmet Yildiz
This paper investigated the effect of sensor density and alignment for three-dimensional shape sensing of an airplane-wing-shaped thick panel subjected to three different loading conditions, i.e., bending, torsion, and membrane loads. For shape sensing analysis of the panel, the Inverse Finite Element Method (iFEM) was used together with the Refined Zigzag Theory (RZT), in order to enable accurate predictions for transverse deflection and through-the-thickness variation of interfacial displacements. In this study, the iFEM-RZT algorithm is implemented by utilizing a novel three-node C°-continuous inverse-shell element, known as i3-RZT...
November 30, 2017: Sensors
Qingyu Peng, Yuyang Qin, Xu Zhao, Xianxian Sun, Qiang Chen, Fan Xu, Zaishan Lin, Ye Yuan, Ying Li, Jianjun Li, Weilong Yin, Chao Gao, Fan Zhang, Xiaodong He, Yibin Li
Lightweight, high-performance thermally insulating, and anti-frosting porous materials are in increasing demand to improve the energy efficiency in many fields, such as aerospace, wearable devices. However, traditional thermally insulating materials (porous ceramics, polymer-based sponge) could not simultaneously meet these demands. Here, we propose a hierarchical assembling strategy for producing nanocomposite foams with lightweight, mechanically flexible, super-insulating and anti-frosting properties. The nanocomposite foams consist of highly anisotropic reduced graphene oxide/polyimide (abbreviated as rGO/PI) network and hollow graphene oxide spheres with micro size...
November 28, 2017: ACS Applied Materials & Interfaces
Mei-Yan Xu, Jia-Hui Ma, Bao-Shi Yuan, Jian Yin, Lan Liu, Qing-Bin Lu
BACKGROUND AND AIMS: The association between Helicobacter pylori (H. pylori) and gallbladder diseases is still unclear and is controversial. We conducted a retrospective study to clarify the prevalence of gallbladder diseases, and factors related to gallbladder diseases, and relationships between H. pylori infection, gallstones, cholecystitis and cholecystic polypus. METHODS: The retrospective study was performed at the Aerospace Center Hospital in Beijing. The subjects in this study were a healthy population who underwent health examinations at the hospital between 2012 and 2015...
November 27, 2017: Journal of Gastroenterology and Hepatology
Erzhen Zhou, Jiabin Xi, Yingjun Liu, Zhen Xu, Yan Guo, Li Peng, Weiwei Gao, Ji Ying, Zichen Chen, Chao Gao
As promising carbonaceous films, graphene films (GF) have exhibited many remarkable mechanical and electrical/thermal properties of great potential for wide functional applications. However, the electrical conductivity of GF still needs to be improved and the limitation lies in the low carrier density of pure graphene. Here, we presented a post-doping method for large-area potassium doped graphene films (GF-K) and promoted the electrical conductivity of GF approaching benchmark metals. The macroscopic-assembled GF-K shows a similar color to graphite intercalation compounds...
November 27, 2017: Nanoscale
David Shumway Jones, Gerald M Oppenheimer
Most historians, epidemiologists, and physicians credit the Framing-ham Heart Study for introducing the term "risk factor" to public health and medicine. Many add that the term came from life insurance companies. This familiar history is incorrect. Taking advantage of the expanding availability of digitized and full-text searchable journals, textbooks, newspapers, and other sources, we have uncovered a deeper and broader history. Antecedent concepts (such as risk, factor, predisposition) have ancient roots...
2017: Perspectives in Biology and Medicine
Hajra Ashraf, Mikael H Sodergren, Nabeel Merali, George Mylonas, Harsimrat Singh, Ara Darzi
BACKGROUND: Eye-tracking technology is an established research tool within allied industries such as advertising, psychology and aerospace. This review aims to consolidate literature describing the evidence for use of eye-tracking as an adjunct to traditional teaching methods in medical education. METHODS: A systematic literature review was conducted in line with STORIES guidelines. A search of EMBASE, OVID MEDLINE, PsycINFO, TRIP database, and Science Direct was conducted until January 2017...
November 26, 2017: Medical Teacher
Ajay Krishnamurthy, Donald L Hunston, Amanda L Forster, Bharath Natarajan, Andrew H Liotta, Sunny S Wicks, Paul E Stutzman, Brian L Wardle, J Alexander Liddle, Aaron M Forster
As carbon nanotube (CNT) infused hybrid composites are increasingly identified as next-generation aerospace materials, it is vital to evaluate their long-term structural performance under aging environments. In this work, the durability of hierarchical, aligned CNT grafted aluminoborosilicate microfiber-epoxy composites (CNT composites) are compared against baseline aluminoborosilicate composites (baseline composites), before and after immersion in water at 25 °C (hydro) and 60 °C (hydrothermal), for extended durations (90 d and 180 d)...
December 2017: Carbon
(no author information available yet)
No abstract text is available yet for this article.
December 1, 2017: Aerospace Medicine and Human Performance
Charles A DeJohn, William D Mills
INTRODUCTION: Until recently, glaucoma requiring treatment was disqualifying for U.S. pilots and required an aeromedical special issuance waiver. Since 2013 Aerospace Medical Examiners (AMEs) have been authorized to evaluate third-class pilots with mild glaucoma using similar protocols and issue medical certificates without a waiver if these criteria specified in the AME Guide are met. METHODS: The FAA's medical database was searched for pilots with glaucoma between 2005 and 2014...
December 1, 2017: Aerospace Medicine and Human Performance
Valerie E Martindale
No abstract text is available yet for this article.
December 1, 2017: Aerospace Medicine and Human Performance
Changzi Qu, Junsong Hu, Xing Liu, Zheng Li, Yanhuai Ding
As an attractive dielectric material, polyimide has been widely used in the field of electronics, aerospace, and automobiles due to its useful mechanical properties and good chemical resistance. UV irradiation was considered to be the main factor related to the damage and failure of polyimide. Here the effects of UV irradiation on the surface morphology and microscale mechanical properties of polyimide films are characterized by atomic force microscopy (AFM). The surface roughness of the UV-irradiated samples developed and the mechanical properties degraded with the radiation dose increased...
November 20, 2017: Materials
Eduardo Palermo, Stefano Rossi, Fabrizio Patanè, Jeffrey Laut, Maurizio Porfiri
Prof. Paolo Cappa passed away on 26 August 2016, at the age of 59, after a long and courageous fight against cancer. Paolo Cappa was a Professor in Mechanical and Thermal Measurements and Experimental Biomechanics in the Department of Mechanical and Aerospace Engineering of Sapienza University of Rome, where he had also served as the Head of the Department, and a Research Professor in the Department of Mechanical and Aerospace Engineering of New York University Tandon School of Engineering. During his intense, yet short, career, he made several significant scientific contributions within the discipline of Mechanical and Thermal Measurements, pioneering fundamental applications to Biomechanics...
November 18, 2017: Sensors
Nélia Alberto, Maria A Fonseca, Victor Neto, Rogério Nogueira, Mónica Oliveira, Rui Moreira
Shape memory polyurethanes (SMPUs) are thermally activated shape memory materials, which can be used as actuators or sensors in applications including aerospace, aeronautics, automobiles or the biomedical industry. The accurate characterization of the memory effect of these materials is therefore mandatory for the technology's success. The shape memory characterization is normally accomplished using mechanical testing coupled with a heat source, where a detailed knowledge of the heat cycle and its influence on the material properties is paramount but difficult to monitor...
November 11, 2017: Sensors
Matthias Bönisch, Ajit Panigrahi, Mihai Stoica, Mariana Calin, Eike Ahrens, Michael Zehetbauer, Werner Skrotzki, Jürgen Eckert
Ti-alloys represent the principal structural materials in both aerospace development and metallic biomaterials. Key to optimizing their mechanical and functional behaviour is in-depth know-how of their phases and the complex interplay of diffusive vs. displacive phase transformations to permit the tailoring of intricate microstructures across a wide spectrum of configurations. Here, we report on structural changes and phase transformations of Ti-Nb alloys during heating by in situ synchrotron diffraction. These materials exhibit anisotropic thermal expansion yielding some of the largest linear expansion coefficients (+ 163...
November 10, 2017: Nature Communications
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