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Cécile Frampas, Julia Ney, Mark Coburn, Marc Augsburger, Vincent Varlet
Xenon is a rare, mostly inert, noble gas that has applications in a wide range of fields, including medicine. Xenon acts on the human body as a useful organ-protective and anesthetic agent and has also been previously studied for potential applications in fields such as optics, aerospace and medical imaging. Recently, it was discovered that xenon can boost erythropoietin production, and it has been used as a performance-enhancing agent in international sports competitions such as the Sochi Olympic Games. Therefore, screening methods to detect the misuse of xenon by analysis of biological samples and to monitor anesthesia kinetics and efficiency are being investigated...
April 13, 2018: Journal of Forensic and Legal Medicine
Yong-Ho Kim, Hyo-Sang Yoo, Hyeon-Taek Son
Magnesium and its alloys are potential candidates for many automotive and aerospace applications due to their low density and high specific strength. However, the use of magnesium as wrought products is limited because of its poor workability at ambient temperatures. Mg-Li alloys containing 5-11 wt.% Li exhibit a two-phase structure consisting of a α (hcp) Mg-rich phase and a β (bcc) Li-rich phase. Mg-Li alloys with Li content greater than 11 wt.% exhibit a single-phase structure consisting of only the β phase...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Fabrizia Caiazzo, Alessandra Caggiano
Laser welding of titanium alloys is attracting increasing interest as an alternative to traditional joining techniques for industrial applications, with particular reference to the aerospace sector, where welded assemblies allow for the reduction of the buy-to-fly ratio, compared to other traditional mechanical joining techniques. In this research work, an investigation on laser welding of Ti⁻6Al⁻4V alloy plates is carried out through an experimental testing campaign, under different process conditions, in order to perform a characterization of the produced weld bead geometry, with the final aim of developing a cognitive methodology able to support decision-making about the selection of the suitable laser welding process parameters...
April 20, 2018: Materials
(no author information available yet)
No abstract text is available yet for this article.
May 1, 2018: Aerospace Medicine and Human Performance
Frank Weber
BACKGROUND: Metabolic syndrome is a cluster of metabolic abnormalities that can affect a pilot's health. The aim of the study was to establish the prevalence of metabolic syndrome in the German Air Force. METHODS: All German military pilots are examined regularly at the German Air Force Center of Aerospace Medicine. The data are stored in a special database designed for that purpose. A database query was performed. The following parameters were analyzed: age, duration of observation, BMI, physical working capacity (PWC 170), blood pressure, erythrocyte sedimentation rate (ESR), cholesterol, HDL-cholesterol, triglycerides, fasting blood glucose...
May 1, 2018: Aerospace Medicine and Human Performance
Aurélie Collado, Jean-Philippe Hainaut, Vincent Monfort, Benoît Bolmont
Evidence from extreme environments suggests that there are relationships between difficulties of adaptation and psychological factors such as personality. In the framework of microgravity research on humans, the aim of this exploratory study was to investigate inter-individual differences of parabonauts on the basis of quality of adaptation to the physical demands of parabolic flights. The personality characteristics of two groups of parabonauts with a different quality of adaptation (an Adaptive group, N = 7, and a Maladaptive group, N = 15) were assessed using the Sensation Seeking Scale, Brief COPE, and MSSQ-Short...
2018: Frontiers in Psychology
Jeffery C Chancellor, Rebecca S Blue, Keith A Cengel, Serena M Auñón-Chancellor, Kathleen H Rubins, Helmut G Katzgraber, Ann R Kennedy
Despite years of research, understanding of the space radiation environment and the risk it poses to long-duration astronauts remains limited. There is a disparity between research results and observed empirical effects seen in human astronaut crews, likely due to the numerous factors that limit terrestrial simulation of the complex space environment and extrapolation of human clinical consequences from varied animal models. Given the intended future of human spaceflight, with efforts now to rapidly expand capabilities for human missions to the moon and Mars, there is a pressing need to improve upon the understanding of the space radiation risk, predict likely clinical outcomes of interplanetary radiation exposure, and develop appropriate and effective mitigation strategies for future missions...
2018: NPJ Microgravity
Panteleimon Chriskos, Christos A Frantzidis, Polyxeni T Gkivogkli, Panagiotis D Bamidis, Chrysoula Kourtidou-Papadeli
Sleep staging, the process of assigning labels to epochs of sleep, depending on the stage of sleep they belong, is an arduous, time consuming and error prone process as the initial recordings are quite often polluted by noise from different sources. To properly analyze such data and extract clinical knowledge, noise components must be removed or alleviated. In this paper a pre-processing and subsequent sleep staging pipeline for the sleep analysis of electroencephalographic signals is described. Two novel methods of functional connectivity estimation (Synchronization Likelihood/SL and Relative Wavelet Entropy/RWE) are comparatively investigated for automatic sleep staging through manually pre-processed electroencephalographic recordings...
2018: Frontiers in Human Neuroscience
Xuejiao Zhou, Yongli Chen, Jianguo Yin, Wentang Xia, Xiaoli Yuan, Xiaoyan Xiang
Based on physicochemical properties of the scraps of spent aerospace magnetic materials, a roasting - magnetic separation followed by sulfuric acid leaching process was proposed to extract cobalt. Roasting was performed at 500 °C to remove organic impurity. Non-magnetic impurities were reduced by magnetic separation and then the raw material was sieved into desired particle sizes. Acid leaching was carried out to extract cobalt from the scraps and experimental parameters included agitation speed, particle size, initial concentration of sulfuric acid and temperature...
April 4, 2018: Waste Management
Jing Li, Ziyu Guo, Yinzhu Quan, Jian Li
INTRODUCTION: Truss core material, which is a new type of ultra-light material with comprehensive properties, is used in the aerospace industry. The aim of this paper is to investigate the dynamic behavior of three-dimensional Kagome sandwich plates with truss core under transverse and in-plane excitation in the case of 1:1 internal resonance. METHODS: Firstly, the averaged equation is obtained by means of the method of multiple scales. Then, the nonlinear system is analyzed applying the theory of normal form...
January 2018: Journal of Applied Biomaterials & Functional Materials
Tawfiq Alqurashi, Abdulla Alhosani, Mahmoud Dauleh, Ali K Yetisen, Haider Butt
Optical diffusers provide a solution for a variety of applications requiring a Gaussian intensity distribution including imaging systems, biomedical optics, and aerospace. Advances in laser ablation processes have allowed the rapid production of efficient optical diffusers. Here, we demonstrate a novel technique to fabricate high-quality glass optical diffusers with cost-efficiency using a continuous CO2 laser. Surface relief pseudorandom microstructures were patterned on both sides of the glass substrates...
April 4, 2018: Nanoscale
Tommaso Sanna, Ilaria Battistoni, Marco Marini, Serafina Valente
The presence of high-risk features on candidates to percutaneous revascularization is increasingly leading to Impella®-assisted procedures (IAPs). While IAPs are safe and effective procedures, they still require managing a degree of complexity. Clinicians often rely on their ability to recall every step of operative procedures. However, during stressful situations, levels of cognitive function are compromised leading to planning and execution failures and decreased safety. Many high-risk activities such as aviation, aerospace industry, and nuclear plants have been using protocols, standardized procedures and checklists for many years...
March 28, 2018: Minerva Cardioangiologica
Aboma Wagari Gebisa, Hirpa G Lemu
Fused-deposition modeling (FDM), one of the additive manufacturing (AM) technologies, is an advanced digital manufacturing technique that produces parts by heating, extruding and depositing filaments of thermoplastic polymers. The properties of FDM-produced parts apparently depend on the processing parameters. These processing parameters have conflicting advantages that need to be investigated. This article focuses on an investigation into the effect of these parameters on the flexural properties of FDM-produced parts...
March 27, 2018: Materials
Satyapriya Gupta, Vincent Taupin, Claude Fressengeas, Mohamad Jrad
The displacement discontinuity arising between crack surfaces is assigned to smooth densities of crystal defects referred to as disconnections, through the incompatibility of the distortion tensor. In a dual way, the disconnections are defined as line defects terminating surfaces where the displacement encounters a discontinuity. A conservation statement for the crack opening displacement provides a framework for disconnection dynamics in the form of transport laws. A similar methodology applied to the discontinuity of the plastic displacement due to dislocations results in the concurrent involvement of dislocation densities in the analysis...
March 27, 2018: Materials
Camille Loranger, Linda Moreau, Denis Sasseville
BACKGROUND: Aircraft building exposes workers to irritant and sensitizing products. OBJECTIVE: The aim of this article was to study occupational dermatoses among aircraft workers over 25 years. METHODS: The files of aerospace workers referred between 1990 and 2015 were extracted from the database of the McGill University Health Centre contact dermatitis clinic. These were subdivided according to demographics, type of work, patch testing results, and final diagnosis...
March 24, 2018: Dermatitis
Omar Rifaie-Graham, Edward A Apebende, Livia K Bast, Nico Bruns
Sensing of damage, deformation, and mechanical forces is of vital importance in many applications of fiber-reinforced polymer composites, as it allows the structural health and integrity of composite components to be monitored and microdamage to be detected before it leads to catastrophic material failure. Bioinspired and biomimetic approaches to self-sensing and self-reporting materials are reviewed. Examples include bruising coatings and bleeding composites based on dye-filled microcapsules, hollow fibers, and vascular networks...
March 24, 2018: Advanced Materials
Yah Yun Aw, Cheow Keat Yeoh, Muhammad Asri Idris, Pei Leng Teh, Khairul Amali Hamzah, Shulizawati Aqzna Sazali
Fused deposition modelling (FDM) has been widely used in medical appliances, automobile, aircraft and aerospace, household appliances, toys, and many other fields. The ease of processing, low cost and high flexibility of FDM technique are strong advantages compared to other techniques for thermoelectric polymer composite fabrication. This research work focuses on the effect of two crucial printing parameters (infill density and printing pattern) on the tensile, dynamic mechanical, and thermoelectric properties of conductive acrylonitrile butadiene styrene/zinc oxide (CABS/ZnO composites fabricated by FDM technique...
March 22, 2018: Materials
(no author information available yet)
No abstract text is available yet for this article.
April 1, 2018: Aerospace Medicine and Human Performance
(no author information available yet)
No abstract text is available yet for this article.
April 1, 2018: Aerospace Medicine and Human Performance
Valerie E Martindale
No abstract text is available yet for this article.
April 1, 2018: Aerospace Medicine and Human Performance
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