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Vi Khanh Truong, Miljan Stefanovic, Shane Maclaughlin, Mark Tobin, Jitraporn Vongsvivut, Mohammad Al Kobaisi, Russell J Crawford, Elena P Ivanova
Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, building and food industries, amongst others. Polyester and coatings containing both polyester and silica nanoparticles (SiO2NPs) have been widely used to protect steel substrata from corrosion. In this study, we utilized X-ray photoelectron spectroscopy, attenuated total reflection infrared micro-spectroscopy, water contact angle measurements, optical profiling and atomic force microscopy to provide an insight into how exposure to sunlight can cause changes in the micro- and nanoscale integrity of the coatings...
October 11, 2016: Journal of Visualized Experiments: JoVE
Corey Butler, Suzanne Marsh, Joseph W Domitrovich, Jim Helmkamp
BACKGROUND: Wildland fire fighting is a high-risk occupation requiring considerable physical and psychological demands. Multiple agencies publish fatality summaries for wildland fire fighters; however, the reported number and types vary. At least five different surveillance systems capture deaths, each with varying case definitions and case inclusion/exclusion criteria. Four are population-level systems and one is case-based. System differences create challenges to accurately characterize fatalities...
October 18, 2016: Journal of Occupational and Environmental Hygiene
Franklin H G Bridgewater
The management of trauma has evolved significantly over the last 40 years. Seminal to this process was the development in Nebraska of a concept of trauma management that was promulgated as Advanced Trauma Life Support (ATLS). It has achieved global support and is considered by many to be the acme in trauma management. Every participant in an ATLS course remembers that an aviation accident in rural Nebraska was responsible for the nascence of the program but very few know the details of the crash. February 17, 2016, was the 40th anniversary of the accident...
October 2016: Military Medicine
Hansong Li, Chuanping Gao, Guoqian Wang, Ningsong Qu, Di Zhu
The titanium alloy Ti-6Al-4V is used in many industries including aviation, automobile manufacturing, and medical equipment, because of its low density, extraordinary corrosion resistance and high specific strength. Electrochemical machining (ECM) is a non-traditional machining method that allows applications to all kinds of metallic materials in regardless of their mechanical properties. It is widely applied to the machining of Ti-6Al-4V components, which usually takes place in a multicomponent electrolyte solution...
October 13, 2016: Scientific Reports
Lorena Jiménez-Díaz, Antonio Caballero, Natalia Pérez-Hernández, Ana Segura
Bio-jet fuel has attracted a lot of interest in recent years and has become a focus for aircraft and engine manufacturers, oil companies, governments and researchers. Given the global concern about environmental issues and the instability of oil market, bio-jet fuel has been identified as a promising way to reduce the greenhouse gas emissions from the aviation industry, while also promoting energy security. Although a number of bio-jet fuel sources have been approved for manufacture, their commercialization and entry into the market is still a far way away...
October 10, 2016: Microbial Biotechnology
Caitlin L Bojanowski, Wendy J Crookes-Goodson, Jayne B Robinson
In the present study, the use of bacteriophages to prevent growth and/or biofouling by Pseudomonas aeruginosa PAO1 was investigated in microcosms containing Jet A aviation fuel as the carbon source. Bacteriophages were found to be effective at preventing biofilm formation but did not always prevent planktonic growth in the microcosms. This result was at odds with experiments conducted in nutrient-rich medium, demonstrating the necessity to test antimicrobial and antifouling strategies under conditions as near as possible to the 'real world'...
November 2016: Biofouling
Alexander McCumber, K A Strevett
Lead has been banned from automobile gasoline since 1995; however, lead is still used as an additive to aviation gasoline (avgas). Airports are now one of the greatest sources of lead air emission in the US. The objectives of this study were (1) to evaluate soil lead levels radially from three regional airports; (2) collect historical meteorological data; (3) examine the soil organic matter content and (4) develop correlation coefficients to evaluate correlations among variables. Soil samples were collected from 3 different airports in Oklahoma and the soil lead concentration was measured using x-ray fluorescence (XRF)...
October 3, 2016: Chemosphere
Kyoung Ok Kim
Patient safety has become an important policy agenda in healthcare systems since publication of the 1999 report entitled "To Err Is Human." The paradigm has changed from blaming the individual for the error to identifying the weakness in the system that led to the adverse events. Anesthesia is one of the first healthcare specialties to adopt techniques and lessons from the aviation industry. The widespread use of simulation programs and the application of human factors engineering to clinical practice are the influences of the aviation industry...
October 2016: Korean Journal of Anesthesiology
Joseph P Abrahamson, Joseph Zelina, M Gurhan Andac, Randy L Vander Wal
The first order approximation (FOA3) currently employed to estimate BC mass emissions underpredicts BC emissions due to inaccuracies in measuring low smoke numbers (SNs) produced by modern high bypass ratio engines. The recently developed Formation and Oxidation (FOX) method removes the need for and hence uncertainty associated with (SNs), instead relying upon engine conditions in order to predict BC mass. Using the true engine operating conditions from proprietary engine cycle data an improved FOX (ImFOX) predictive relation is developed...
October 13, 2016: Environmental Science & Technology
M L Omholt, T H Tveito, C Ihlebæk
BACKGROUND: The European civilian aviation industry has undergone major changes in the last decade. Despite this, there is little knowledge about work-related stress and subjective health complaints (SHCs) affecting Norwegian aircrew. AIMS: To investigate the relationships between work-related stress, self-efficacy and SHCs in commercial aircrew in Norway and to explore differences between cockpit and cabin crew. METHODS: Aircrew members from the three major airlines operating from Norway completed an electronically distributed questionnaire...
September 28, 2016: Occupational Medicine
Kevin C Dietrich
BACKGROUND: Central serous chorioretinopathy (CSC) is usually a self-limiting condition; however, there is potential for recurrence and permanent visual defects. Aviation demands perfect vision to minimize risk to pilots and aircraft. Consequently, this ailment disqualifies pilots and pilots to be. CASE REPORT: A fully trained fighter pilot with 1260 h in fighter airframes has been contending with central serous chorioretinopathy in the right eye over the course of 3 yr...
2016: Aerospace Medicine and Human Performance
Roberta Rosas Petrocinio, Elga Dias Gomes
BACKGROUND: High altitude retinopathy (HAR) includes a number of diseases related to high altitude such as acute mountain sickness (AMS), high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE). High altitude retinopathy is mainly characterized by retinal hemorrhages, usually sparing the macular region, a condition specifically known as high altitude retinal hemorrhages (HARH). The pathogenesis of HARH is unclear. Many studies show that lack of oxygen causes an inadequate autoregulation of retinal circulation, causing vascular incompetence...
2016: Aerospace Medicine and Human Performance
Melisa Melek Tuncer, Seda Turkoglu Babakurban, Erdinc Aydin
BACKGROUND: Barotrauma is a frequent problem in aviation medicine. Eustachian tube dysfunction plays a critical role in the pathogenesis of barotrauma. Function of the Eustachian tube can be indirectly assessed by multifrequency tympanometry, which provides valuable information about the resistance and permeability of the middle ear in a wide frequency range. The aim of this study was to research whether multifrequency tympanometry could be used for assessing middle ear impairments in pilots...
2016: Aerospace Medicine and Human Performance
Paulo M Alves, Charles A DeJohn, Eduard M Ricaurte, William D Mills
BACKGROUND: In-flight cardiac arrest (IFCA) is a relatively rare but challenging event. Outcomes and prognostic factors are not entirely understood for victims of IFCAs in commercial aviation. METHODS: This was a retrospective cohort study of airline passengers who experienced IFCA. Demographic and operational variables were studied to identify association in a multivariate logistic regression model with the outcome of survival-to-hospital. In-flight medical emergencies were processed by a ground-based medical center...
2016: Aerospace Medicine and Human Performance
Jiaojiao Ren, Lijuan Li, Dandan Zhang, Xiaoli Qiao, Qiongying Lv, Guohua Cao
With the wide use of high-temperature-resistant ceramic matrix composites (CMCs) in aviation and space flight, it is important to detect the quality of the bonding. This paper used terahertz (THz) time-domain spectroscopy nondestructive testing technology to inspect the bonding defects of the CMC. This paper puts forward a method-extraction method, which is applied to make samples to simulate the bonding defect of CMC by embedding polytetrafluoroethylene (PTFE) sheets with 0.12 mm thickness into the adhesive layer and extracting it after curing and presetting the bonding defects...
September 10, 2016: Applied Optics
Fang Guo, Jing Zhao, Lusi A, Xiaoyi Yang
The aim of this work is to compare the life cycle assessments of low-N and normal culture conditions for a balance between the lipid content and specific productivity. In order to achieve the potential contribution of lipid content to the life cycle assessment, this study established relationships between lipid content (nitrogen effect) and specific productivity based on three microalgae strains including Chlorella, Isochrysis and Nannochloropsis. For microalgae-based aviation fuel, the effects of the lipid content on fossil fuel consumption and greenhouse gas (GHG) emissions are similar...
December 2016: Bioresource Technology
Paschal Ikenna Enyinna
Radiological risk parameters associated with aircrew members traveling from Houston Intercontinental Airport to Lagos International Airport have been computed using computer software called EPCARD (version 3.2). The mean annual effective dose of radiation was computed to be 2.94 mSv/year. This result is above the standard permissible limit of 1 mSv/year set for the public and pregnant aircrew members but below the limit set for occupationally exposed workers. The Risk of cancer mortality and excess career time cancer risk computed ranged from 3...
July 2016: Journal of Medical Physics
A Duclos, J L Peix, V Piriou, P Occelli, A Denis, S Bourdy, M J Carty, A A Gawande, F Debouck, C Vacca, J C Lifante, C Colin
BACKGROUND: The application of safety principles from the aviation industry to the operating room has offered hope in reducing surgical complications. This study aimed to assess the impact on major surgical complications of adding an aviation-based team training programme after checklist implementation. METHODS: A prospective parallel-group cluster trial was undertaken between September 2011 and March 2013. Operating room teams from 31 hospitals were assigned randomly to participate in a team training programme focused on major concepts of crew resource management and checklist utilization...
September 19, 2016: British Journal of Surgery
Christian Foerch, Christoph A Mayer, Joachim Berkefeld, Se-Jong You
BACKGROUND: The occurrence of an acute stroke syndrome during a long-distance flight demands critical decisions from the crew and attendant physicians. One in particular is whether the flight should be continued or be detoured to a nearby airport. CASE REPORT: We describe a 42-yr-old woman who suffered from a severe stroke in a commercial airplane over the Sahara. The captain, together with a physician aboard and the next of kin, decided not to detour to north African or south European airports, but to continue flying to Frankfurt, Germany (final destination; remaining flight time 4 h), where an efficient transfer infrastructure and an advanced medical standard were presumed...
September 2016: Aerospace Medicine and Human Performance
Stephen Houston, Elizabeth Wilkinson
INTRODUCTION: Aviation medical specialists should be aware that commercial airline aircraft engineers may undertake a 'dive equivalent' operation while conducting maintenance activities on the ground. We present a worked example of an occupational risk assessment to determine a minimum safe preflight surface interval (PFSI) for an engineer before flying home to base after conducting an Excessive Cabin Leakage Test (ECLT) on an unserviceable aircraft overseas. METHOD: We use published dive tables to determine the minimum safe PFSI...
September 2016: Aerospace Medicine and Human Performance
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