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https://www.readbyqxmd.com/read/29136391/effects-of-1-h-16-o-charged-particle-irradiation-on-short-term-memory-and-hippocampal-physiology-in-a-murine-model
#1
Frederico Kiffer, Hannah Carr, Thomas Groves, Julie E Anderson, Tyler Alexander, Jing Wang, John W Seawright, Vijayalakshmi Sridharan, Gwendolyn Carter, Marjan Boerma, Antiño R Allen
Radiation from galactic cosmic rays (GCR) poses a significant health risk for deep-space flight crews. GCR are unique in their extremely high-energy particles. With current spacecraft shielding technology, some of the predominant particles astronauts would be exposed to are (1)H + (16)O. Radiation has been shown to cause cognitive deficits in mice. The hippocampus plays a key role in memory and cognitive tasks; it receives information from the cortex, undergoes dendritic-dependent processing and then relays information back to the cortex...
November 14, 2017: Radiation Research
https://www.readbyqxmd.com/read/29122185/smartphone-form-factors-effects-of-width-and-bottom-bezel-on-touch-performance-workload-and-physical-demand
#2
Seul Chan Lee, Min Chul Cha, Hwan Hwangbo, Sookhee Mo, Yong Gu Ji
This study aimed at investigating the effect of two smartphone form factors (width and bottom bezel) on touch behaviors with one-handed interaction. User experiments on tapping tasks were conducted for four widths (67, 70, 72, and 74 mm) and five bottom bezel levels (2.5, 5, 7.5, 10, and 12.5 mm). Task performance, electromyography, and subjective workload data were collected to examine the touch behavior. The success rate and task completion time were collected as task performance measures. The NASA-TLX method was used to observe the subjective workload...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29116168/spaceborne-synthetic-aperture-radar-survey-of-subsidence-in-hampton-roads-virginia-usa
#3
D P S Bekaert, B D Hamlington, B Buzzanga, C E Jones
Over the past century, the Hampton Roads area of the Chesapeake Bay region has experienced one of the highest rates of relative sea level rise on the Atlantic coast of the United States. This rate of relative sea level rise results from a combination of land subsidence, which has long been known to be present in the region, and rising seas associated with global warming on long timescales and exacerbated by shifts in ocean dynamics on shorter timescales. An understanding of the current-day magnitude of each component is needed to create accurate projections of future relative sea level rise upon which to base planning efforts...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29107224/spatial-analysis-of-concentrations-of-multiple-air-pollutants-using-nasa-discover-aq-aircraft-measurements-implications-for-exposure-assessment
#4
Hyung Joo Lee, Robert B Chatfield, Michelle L Bell
In recent years, multipollutant approaches have been employed to investigate the association with health outcomes to better represent real-world conditions than more traditional analysis that considers a single pollutant. With regard to the exposure assessment of a mixture of air pollutants, it is critical to understand the spatial variability in multipollutant relations in order to assess their potential health implications. In this study, we investigated the spatial relations of multiple pollutant concentrations (i...
October 27, 2017: Environmental Research
https://www.readbyqxmd.com/read/29097693/atmospheric-beacons-of-life-from-exoplanets-around-g-and-k-stars
#5
Vladimir S Airapetian, Charles H Jackman, Martin Mlynczak, William Danchi, Linda Hunt
The current explosion in detection and characterization of thousands of extrasolar planets from the Kepler mission, the Hubble Space Telescope, and large ground-based telescopes opens a new era in searches for Earth-analog exoplanets with conditions suitable for sustaining life. As more Earth-sized exoplanets are detected in the near future, we will soon have an opportunity to identify habitale worlds. Which atmospheric biosignature gases from habitable planets can be detected with our current capabilities? The detection of the common biosignatures from nitrogen-oxygen rich terrestrial-type exoplanets including molecular oxygen (O2), ozone (O3), water vapor (H2O), carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4) requires days of integration time with largest space telescopes, and thus are very challenging for current instruments...
November 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29092488/a-spinner-magnetometer-for-large-apollo-lunar-samples
#6
M Uehara, J Gattacceca, Y Quesnel, C Lepaulard, E A Lima, M Manfredi, P Rochette
We developed a spinner magnetometer to measure the natural remanent magnetization of large Apollo lunar rocks in the storage vault of the Lunar Sample Laboratory Facility (LSLF) of NASA. The magnetometer mainly consists of a commercially available three-axial fluxgate sensor and a hand-rotating sample table with an optical encoder recording the rotation angles. The distance between the sample and the sensor is adjustable according to the sample size and magnetization intensity. The sensor and the sample are placed in a two-layer mu-metal shield to measure the sample natural remanent magnetization...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29079792/eye-head-coordination-in-31-space-shuttle-astronauts-during-visual-target-acquisition
#7
Millard F Reschke, Ognyan I Kolev, Gilles Clément
Between 1989 and 1995, NASA evaluated how increases in flight duration of up to 17 days affected the health and performance of Space Shuttle astronauts. Thirty-one Space Shuttle pilots participating in 17 space missions were tested at 3 different times before flight and 3 different times after flight, starting within a few hours of return to Earth. The astronauts moved their head and eyes as quickly as possible from the central fixation point to a specified target located 20°, 30°, or 60° off center. Eye movements were measured with electro-oculography (EOG)...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29078360/reduction-of-solar-photovoltaic-resources-due-to-air-pollution-in-china
#8
Xiaoyuan Li, Fabian Wagner, Wei Peng, Junnan Yang, Denise L Mauzerall
Solar photovoltaic (PV) electricity generation is expanding rapidly in China, with total capacity projected to be 400 GW by 2030. However, severe aerosol pollution over China reduces solar radiation reaching the surface. We estimate the aerosol impact on solar PV electricity generation at the provincial and regional grid levels in China. Our approach is to examine the 12-year (2003-2014) average reduction in point-of-array irradiance (POAI) caused by aerosols in the atmosphere. We apply satellite-derived surface irradiance data from the NASA Clouds and the Earth's Radiant Energy System (CERES) with a PV performance model (PVLIB-Python) to calculate the impact of aerosols and clouds on POAI...
October 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29077532/the-mental-workload-evaluation-in-visualizing-telehealth-indicators-on-three-dimensional-interface
#9
Amadeu S Campos Filho, Magdala A Novaes, Alex S Gomes
INTRODUCTION: As Internet bandwidth has risen, resulting in an exponential increase in the amount of data, one of the challenges is to transform large amounts of unstructured health data into legible information through visualization techniques to facilitate the decision-making between the telehealth managers. Traditionally, data visualization has been two-dimensional (2D), but it is often difficult to visualize and interpret when making decisions with multidimensional data. Three-dimensional (3D) visualization techniques are emerging to address this issue...
October 27, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/29074747/nasa-weighs-trimming-wfirst-to-hold-down-costs
#10
Daniel Clery
No abstract text is available yet for this article.
October 27, 2017: Science
https://www.readbyqxmd.com/read/29065020/personalized-video-feedback-and-repeated-task-practice-improve-laparoscopic-knot-tying-skills-two-controlled-trials
#11
RANDOMIZED CONTROLLED TRIAL
Eduardo F Abbott, Whitney Thompson, T K Pandian, Benjamin Zendejas, David R Farley, David A Cook
PURPOSE: Compare the effect of personalized feedback (PF) vs. task demonstration (TD), both delivered via video, on laparoscopic knot-tying skills and perceived workload; and evaluate the effect of repeated practice. METHOD: General surgery interns and research fellows completed four repetitions of a simulated laparoscopic knot-tying task at one-month intervals. Midway between repetitions, participants received via e-mail either a TD video (demonstration by an expert) or a PF video (video of their own performance with voiceover from a blinded senior surgeon)...
November 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/29056765/improving-photometric-calibration-of-meteor-video-camera-systems
#12
Steven Ehlert, Aaron Kingery, Robert Suggs
We present the results of new calibration tests performed by the NASA Meteoroid Environment Office (MEO) designed to help quantify and minimize systematic uncertainties in meteor photometry from video camera observations. These systematic uncertainties can be categorized by two main sources: an imperfect understanding of the linearity correction for the MEO's Watec 902H2 Ultimate video cameras and uncertainties in meteor magnitudes arising from transformations between the Watec camera's Sony EX-View HAD bandpass and the bandpasses used to determine reference star magnitudes...
September 1, 2017: Planetary and Space Science
https://www.readbyqxmd.com/read/29048320/development-of-the-carmen-q-questionnaire-for-mental-workload-assessment
#13
Susana Rubio-Valdehita, María I López-Núñez, Ramón López-Higes, Eva M Díaz-Ramiro
BACKGROUND: Mental workload has emerged as one of the most important occupational risk factors present in most psychological and physical diseases caused by work. In view of the lack of specific tools to assess mental workload, the objective of this research was to assess the construct validity and reliability of a new questionnaire for mental workload assessment (CarMen-Q). METHOD: The sample was composed of 884 workers from several professional sectors, between 18 and 65 years old, 53...
November 2017: Psicothema
https://www.readbyqxmd.com/read/29047616/hyperspectral-remote-sensing-image-retrieval-system-using-spectral-and-texture-features
#14
Jing Zhang, Wenhao Geng, Xi Liang, Jiafeng Li, Li Zhuo, Qianlan Zhou
Although many content-based image retrieval systems have been developed, few studies have focused on hyperspectral remote sensing images. In this paper, a hyperspectral remote sensing image retrieval system based on spectral and texture features is proposed. The main contributions are fourfold: (1) considering the "mixed pixel" in the hyperspectral image, endmembers as spectral features are extracted by an improved automatic pixel purity index algorithm, then the texture features are extracted with the gray level co-occurrence matrix; (2) similarity measurement is designed for the hyperspectral remote sensing image retrieval system, in which the similarity of spectral features is measured with the spectral information divergence and spectral angle match mixed measurement and in which the similarity of textural features is measured with Euclidean distance; (3) considering the limited ability of the human visual system, the retrieval results are returned after synthesizing true color images based on the hyperspectral image characteristics; (4) the retrieval results are optimized by adjusting the feature weights of similarity measurements according to the user's relevance feedback...
June 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29043535/towards-multilevel-mental-stress-assessment-using-svm-with-ecoc-an-eeg-approach
#15
Fares Al-Shargie, Tong Boon Tang, Nasreen Badruddin, Masashi Kiguchi
Mental stress has been identified as one of the major contributing factors that leads to various diseases such as heart attack, depression, and stroke. To avoid this, stress quantification is important for clinical intervention and disease prevention. This study aims to investigate the feasibility of exploiting electroencephalography (EEG) signals to discriminate between different stress levels. We propose a new assessment protocol whereby the stress level is represented by the complexity of mental arithmetic (MA) task for example, at three levels of difficulty, and the stressors are time pressure and negative feedback...
October 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29043499/open-circuit-respirometry-a-historical-review-of-portable-gas-analysis-systems
#16
REVIEW
Duncan J Macfarlane
Scientists such as physiologists, engineers, and nutritionists have often sought to estimate human metabolic strain during daily activities and physical pursuits. The measurement of human metabolism can involve direct calorimetry as well as indirect calorimetry using both closed-circuit respirometry and open-circuit methods that can include diluted flow chambers and laboratory-based gas analysis systems. For field studies, methods involving questionnaires, pedometry, accelerometery, heart rate telemetry, and doubly labelled water exist, yet portable metabolic gas analysis remains the gold standard for most field studies on energy expenditure...
October 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29040433/low-end-tidal-co2-as-a-real-time-severity-marker-of-intra-anaesthetic-acute-hypersensitivity-reactions
#17
A Gouel-Chéron, L de Chaisemartin, F Jönsson, P Nicaise-Roland, V Granger, A Sabahov, M-T Guinnepain, S Chollet-Martin, P Bruhns, C Neukirch, D Longrois
Background: Prompt diagnosis of intra-anaesthetic acute hypersensitivity reactions (AHR) is challenging because of the possible absence and/or difficulty in detecting the usual clinical signs and because of the higher prevalence of alternative diagnoses. Delayed epinephrine administration during AHR, because of incorrect/delayed diagnosis, can be associated with poor prognosis. Low end-tidal CO2 (etCO2) is known to be linked to low cardiac output. Yet, its clinical utility during suspected intra-anaesthetic AHR is not well documented...
November 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29039682/on-the-habitability-of-desert-varnish-a-combined-study-by-micro-raman-spectroscopy-x-ray-diffraction-and-methylated-pyrolysis-gas-chromatography-mass-spectrometry
#18
C Malherbe, I B Hutchinson, R Ingley, A Boom, A S Carr, H Edwards, B Vertruyen, B Gilbert, G Eppe
In 2020, the ESA ExoMars and NASA Mars 2020 missions will be launched to Mars to search for evidence of past and present life. In preparation for these missions, terrestrial analog samples of rock formations on Mars are studied in detail in order to optimize the scientific information that the analytical instrumentation will return. Desert varnishes are thin mineral coatings found on rocks in arid and semi-arid environments on Earth that are recognized as analog samples. During the formation of desert varnishes (which takes many hundreds of years), organic matter is incorporated, and microorganisms may also play an active role in the formation process...
November 2017: Astrobiology
https://www.readbyqxmd.com/read/29032252/a-comparison-of-industry-leading-energy-devices-for-use-in-gynecologic-laparoscopy-articulating-enseal-versus-ligasure-energy-devices
#19
Linda-Dalal J Shiber, Daniel N Ginn, Ambareen Jan, Jeremy T Gaskins, Shan M Biscette, Resad Pasic
OBJECTIVE: To compare two laparoscopic bipolar electrosurgical devices used in total laparoscopic hysterectomy (TLH). An articulating advanced bipolar device (ENSEAL® G2, Ethicon) and an electrothermal bipolar vessel sealer (LigasureTM, Covidien) were analyzed for difference in surgeon perception of ease of instrument use and workload using the raw-Task Load Index (RTLX) scale. Secondarily, differences in operative time, estimated blood loss (EBL), and perioperative complication rates between the two devices were examined...
October 12, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29031822/a-systematic-review-of-volar-locking-plate-removal-after-distal-radius-fracture
#20
REVIEW
Michiro Yamamoto, Yuki Fujihara, Nasa Fujihara, Hitoshi Hirata
BACKGROUND: Indication of volar locking plate (VLP) removal after bony healing of distal radius fracture (DRF) is controversial. Studies with various range of removal rate were reported. The purpose of this systematic review was to investigate the frequency and the reasons of hardware removal over the world. We hypothesized that more frequent VLP removal contribute to better clinical outcomes. METHODS: The authors searched all available literature in the PubMed and EMBASE databases for articles reporting on outcomes of treatment using VLP for DRF...
October 9, 2017: Injury
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