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https://www.readbyqxmd.com/read/28447482/quantitative-potassium-measurements-with-laser-induced-breakdown-spectroscopy-using-low-energy-lasers-application-to-in-situ-k-ar-geochronology-for-planetary-exploration
#1
Yuichiro Cho, Misa Horiuchi, Kazuo Shibasaki, Shingo Kameda, Seiji Sugita
In situ radiogenic isotope measurements to obtain the absolute age of geologic events on planets are of great scientific value. In particular, K-Ar isochrons are useful because of their relatively high technical readiness and high accuracy. Because this isochron method involves spot-by-spot K measurements using laser-induced breakdown spectroscopy (LIBS) and simultaneous Ar measurements with mass spectrometry, LIBS measurements are conducted under a high vacuum condition in which emission intensity decreases significantly...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28437992/a-large-airborne-survey-of-earth-s-visible-infrared-spectral-dimensionality
#2
David R Thompson, Joseph W Boardman, Michael L Eastwood, Robert O Green
The intrinsic spectral dimensionality indicates the observable degrees of freedom in Earth's solar-reflected light field, quantifying the diversity of spectral content accessible by visible and infrared remote sensing. The solar-reflected regime spans the 0.38 - 2.5 μm interval, and is captured by a wide range of current and planned instruments on both airborne and orbital platforms. To date there has been no systematic study of its spectral dimensionality as a function of space, time, and land cover. Here we report a multi-site, multi-year statistical survey by NASA's "Classic" Airborne Visible Near InfraRed Spectrometer (AVIRIS-C)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#3
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28417839/mortality-due-to-cardiovascular-disease-among-apollo-lunar-astronauts
#4
Robert J Reynolds, Steven M Day
INTRODUCTION: Recent research has postulated increased cardiovascular mortality for astronauts who participated in the Apollo lunar missions. The conclusions, however, are based on small numbers of astronauts, are derived from methods with known weaknesses, and are not consistent with prior research. METHODS: Records for NASA astronauts and U.S. Air Force astronauts were analyzed to produce standardized mortality ratios. Lunar astronauts were compared to astronauts who have never flown in space (nonflight astronauts), those who have only flown missions in low Earth orbit (LEO astronauts), and the U...
May 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28417837/flight-crew-workload-evaluation-based-on-the-workload-function-distribution-method
#5
Yiyuan Zheng, Yanyu Lu, Yuwen Jie, Shan Fu
BACKGROUND: The minimum flight crew on the flight deck should be established according to the workload for individual crewmembers. Typical workload measures consist of three types: subjective rating scale, task performance, and psychophysiological measures. However, all these measures have their own limitations. To reflect flight crew workload more specifically and comprehensively within the flight environment, and more directly comply with airworthiness regulations, the Workload Function Distribution Method, which combined the basic six workload functions, was proposed...
May 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28412874/effects-of-regulatory-support-services-on-institutional-review-board-turnaround-times
#6
Pankaja Desai, Priyanka Nasa, Jackie Soo, Cunhui Jia, Michael L Berbaum, James H Fischer, Timothy P Johnson
We evaluated how regulatory support services provided by University of Illinois at Chicago's Center for Clinical and Translational Science may reduce Institutional Review Board (IRB) turnaround times. IRB applications were categorized by receipt of any regulatory support and amount of support received. Turnaround time included total turnaround time, time for IRB review, and time for investigators to modify protocols. There were no differences in any turnaround times for supported versus nonsupported applications...
April 1, 2017: Journal of Empirical Research on Human Research Ethics: JERHRE
https://www.readbyqxmd.com/read/28411723/fatigue-of-chinese-railway-employees-and-its-influential-factors-structural-equation-modelling
#7
Liuxing Tsao, Jing Chang, Liang Ma
Fatigue is an identifiable and preventable cause of accidents in transport operations. Regarding the railway sector, incident logs and simulation studies show that employee fatigue leads to lack of alertness, impaired performance, and occurrence of incidents. China has one of the largest rail systems in the world, and Chinese railway employees work under high fatigue risks; therefore, it is important to assess their fatigue level and find the major factors leading to fatigue. We designed a questionnaire that uses Multidimensional Fatigue Instrument (MFI-20), NASA-TLX and subjective rating of work overtime feelings to assess employee fatigue...
July 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28410696/isolated-splenic-tuberculosis-diagnosed-by-endoscopic-ultrasound-guided-fine-needle-aspiration
#8
Mukesh Nasa, Narendra S Choudhary, Mridula Guleria, Rajesh Puri
Our patient was a 48-year-old female, who presented with history of persistent low-grade fever and weight loss. The CT scan of the abdomen revealed multiple hypodense lesions in spleen. No primary focus of infection was detected in any other organs. Endoscopic ultrasound-guided fine needle aspiration of splenic lesion revealed granulomatous inflammation. The patient was started on anti-tuberculous therapy. There is a diagnostic possibility of splenic tuberculosis even in immunocompetent individuals and we chose a combination anti-tuberculous therapy as the first line treatment with consideration of splenectomy depending on the response...
April 2017: Indian Journal of Tuberculosis
https://www.readbyqxmd.com/read/28402154/glucose-6-phosphate-dehydrogenase-deficiency-and-risk-of-invasive-fungal-disease-in-patients-with-acute-myeloid-leukemia
#9
Marco Sanna, Giovanni Caocci, Antonio Ledda, Federica Orrù, Claudio Fozza, Paola Deias, Gianni Tidore, Fausto Dore, Giorgio La Nasa
Invasive fungal diseases (IFD) are still a leading cause of morbidity and mortality in patients with acute myeloid leukemia (AML). Glucose-6-phosphate dehydrogenase is an enzyme that leads to the production of NADPH, required to destroy microorganisms in the respiratory burst reaction of white blood cells. We evaluated the role of G6PD deficiency in susceptibility of IFD in 108 AML patients undergoing intensive chemotherapy. In all, 28 patients harbored G6PD deficiency (G6PD-), whereas 80 were normal (G6PD +)...
April 12, 2017: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/28399040/a-new-enzyme-linked-immunosorbent-assay-elisa-for-a-total-anti-t-lymphocyte-globulin-determination-development-analytical-validation-and-clinical-application
#10
M Montagna, G La Nasa, M E Bernardo, E Piras, M A Avanzini, M Regazzi, F Locatelli
BACKGROUND: Anti-T lymphocyte globulin (ATLG) modulates the alloreactivity of T lymphocytes, reducing the risk of immunological post-transplant complications, in particular rejection and graft-versus-host disease (GvHD), after allogeneic hematopoietic stem cell transplantation (HSCT).We developed and validated a new enzyme-linked immunosorbent assay (ELISA) method to measure serum levels of total ATLG and evaluate the pharmacokinetics (PK) of the drug in children with β-Thalassemia, receiving allogeneic HSCT...
April 7, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28397781/measurement-of-the-cosmic-optical-background-using-the-long-range-reconnaissance-imager-on-new-horizons
#11
Michael Zemcov, Poppy Immel, Chi Nguyen, Asantha Cooray, Carey M Lisse, Andrew R Poppe
The cosmic optical background is an important observable that constrains energy production in stars and more exotic physical processes in the universe, and provides a crucial cosmological benchmark against which to judge theories of structure formation. Measurement of the absolute brightness of this background is complicated by local foregrounds like the Earth's atmosphere and sunlight reflected from local interplanetary dust, and large discrepancies in the inferred brightness of the optical background have resulted...
April 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28383903/pressure-dependent-rate-rules-for-intramolecular-h-migration-reactions-of-hydroperoxyalkylperoxy-radicals-in-low-temperature
#12
Qian Yao, Xiao-Hui Sun, Ze-Rong Li, Fang-Fang Chen, Xiang-Yuan Li
Intramolecular H-migration reaction of hydroperoxyalkylperoxy radicals ((•)O2QOOH) is one of the most important reaction families in the low-temperature oxidation of hydrocarbon fuels. This reaction family is first divided into classes depending upon H atom transfer from -OOH bonded carbon or non-OOH bonded carbon, and then the two classes are further divided depending upon the ring size of the transition states and the types of the carbons from which the H atom is transferred. High pressure limit rate rules and pressure-dependent rate rules for each class are derived from the rate constants of a representative set of reactions within each class using electronic structure calculations performed at the CBS-QB3 level of theory...
April 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28380959/revisiting-short-wave-infrared-swir-bands-for-atmospheric-correction-in-coastal-waters
#13
Nima Pahlevan, Jean-Claude Roger, Ziauddin Ahmad
The shortwave infrared (SWIR) bands on the existing Earth Observing missions like MODIS have been designed to meet land and atmospheric science requirements. The future geostationary and polar-orbiting ocean color missions, however, require highly sensitive SWIR bands (> 1550nm) to allow for a precise removal of aerosol contributions. This will allow for reasonable retrievals of the remote sensing reflectance (R<sub>rs</sub>) using standard NASA atmospheric corrections over turbid coastal waters...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28380263/estimating-the-probability-of-human-error-by-incorporating-component-failure-data-from-user-induced-defects-in-the-development-of-complex-electrical-systems
#14
Peter J Majewicz, Paul Blessner, Bill Olson, Timothy Blackburn
This article proposes a methodology for incorporating electrical component failure data into the human error assessment and reduction technique (HEART) for estimating human error probabilities (HEPs). The existing HEART method contains factors known as error-producing conditions (EPCs) that adjust a generic HEP to a more specific situation being assessed. The selection and proportioning of these EPCs are at the discretion of an assessor, and are therefore subject to the assessor's experience and potential bias...
April 5, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28372057/a-study-of-voice-production-characteristics-of-astronuat-speech-during-apollo-11-for-speaker-modeling-in-space
#15
Chengzhu Yu, John H L Hansen
Human physiology has evolved to accommodate environmental conditions, including temperature, pressure, and air chemistry unique to Earth. However, the environment in space varies significantly compared to that on Earth and, therefore, variability is expected in astronauts' speech production mechanism. In this study, the variations of astronaut voice characteristics during the NASA Apollo 11 mission are analyzed. Specifically, acoustical features such as fundamental frequency and phoneme formant structure that are closely related to the speech production system are studied...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28371841/field-modeling-and-ray-tracing-of-a-miniature-scanning-electron-microscope-beam-column
#16
Jody S Loyd, Don A Gregory, Jessica A Gaskin
A miniature scanning electron microscope (SEM) focusing column design is introduced and its potential performance assessed through an estimation of parameters that affect the probe radius, to include source size, spherical and chromatic aberration, diffraction and space charge broadening. The focusing column, a critical component of any SEM capable of operating on the lunar surface, was developed by the NASA Marshall Space Flight Center and Advanced Research Systems. The ray-trace analysis presented uses a model of the electrostatic field (within the focusing column) that is first calculated using the boundary element method (BEM)...
March 28, 2017: Microscopy
https://www.readbyqxmd.com/read/28361881/wave-particle-energy-exchange-directly-observed-in-a-kinetic-alfv%C3%A3-n-branch-wave
#17
Daniel J Gershman, Adolfo F-Viñas, John C Dorelli, Scott A Boardsen, Levon A Avanov, Paul M Bellan, Steven J Schwartz, Benoit Lavraud, Victoria N Coffey, Michael O Chandler, Yoshifumi Saito, William R Paterson, Stephen A Fuselier, Robert E Ergun, Robert J Strangeway, Christopher T Russell, Barbara L Giles, Craig J Pollock, Roy B Torbert, James L Burch
Alfvén waves are fundamental plasma wave modes that permeate the universe. At small kinetic scales, they provide a critical mechanism for the transfer of energy between electromagnetic fields and charged particles. These waves are important not only in planetary magnetospheres, heliospheres and astrophysical systems but also in laboratory plasma experiments and fusion reactors. Through measurement of charged particles and electromagnetic fields with NASA's Magnetospheric Multiscale (MMS) mission, we utilize Earth's magnetosphere as a plasma physics laboratory...
March 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28360156/draft-genome-sequences-of-tersicoccus-phoenicis-dsm-30849-t-isolated-from-a-cleanroom-for-spacecraft-assembly-and-tersicoccus-sp-strain-bi-70-isolated-from-a-freshwater-lake
#18
Yu Nakajima, Susumu Yoshizawa, Keiji Nakamura, Yoshitoshi Ogura, Tetsuya Hayashi, Kazuhiro Kogure
Here, we report the draft genome sequences of Tersicoccus phoenicis DSM 30849(T), isolated from a spacecraft assembly cleanroom at the National Aeronautics and Space Administration (NASA), and Tersicoccus sp. strain Bi-70, isolated from Lake Biwa, the largest lake in Japan. These genome sequences facilitate our understanding of the adaptation of these closely related strains to different habitats.
March 30, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28349585/real-time-continuous-image-guided-surgery-preclinical-investigation-in-glossectomy
#19
Reza Tabanfar, Jimmy Qiu, Harley Chan, Niousha Aflatouni, Robert Weersink, Wael Hasan, Jonathan C Irish
OBJECTIVES/HYPOTHESIS: To develop, validate, and study the efficacy of an intraoperative real-time continuous image-guided surgery (RTC-IGS) system for glossectomy. STUDY DESIGN: Prospective study. METHODS: We created a RTC-IGS system and surgical simulator for glossectomy, enabling definition of a surgical target preoperatively, real-time cautery tracking, and display of a surgical plan intraoperatively. System performance was evaluated by a group of otolaryngology residents, fellows, medical students, and staff under a reproducible setting by using realistic tongue phantoms...
March 27, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28347391/-biracial-looking-twins-a-new-twin-type-twin-research-twins-with-cystic-teratomas-sleep-quality-and-body-mass-index-previable-membrane-rupture-print-and-online-reports-twins-born-to-a-sister-surrogate-nasa-twin-study-african-cosmopolitan-twin-fashion-inspirations
#20
Nancy L Segal
Dizygotic (DZ) co-twins born to mothers and fathers from different racial or ethnic backgrounds often resemble one parent much more than the other. As such, these pairs comprise a unique subset of twins for investigating how others' responses to their different looks may affect their personalities and self-esteem. This article describes some of these twin pairs and some challenges of raising them, and suggests ways they may be used in research. Next, recent twin research on cystic teratomas, relations between sleep quality and body mass index, and previable membrane rupture is described...
March 28, 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
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