keyword
MENU ▼
Read by QxMD icon Read
search

NASA

keyword
https://www.readbyqxmd.com/read/28208641/temporal-trends-in-satellite-derived-erythemal-uvb-and-implications-for-ambient-sun-exposure-assessment
#1
Marvin Langston, Leslie Dennis, Charles Lynch, Denise Roe, Heidi Brown
Ultraviolet radiation (UVR) has been associated with various health outcomes, including skin cancers, vitamin D insufficiency, and multiple sclerosis. Measurement of UVR has been difficult, traditionally relying on subject recall. We investigated trends in satellite-derived UVB from 1978 to 2014 within the continental United States (US) to inform UVR exposure assessment and determine the potential magnitude of misclassification bias created by ignoring these trends. Monthly UVB data remotely sensed from various NASA satellites were used to investigate changes over time in the United States using linear regression with a harmonic function...
February 10, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28202980/three-sites-where-nasa-might-retrieve-its-first-mars-rock
#2
Alexandra Witze
No abstract text is available yet for this article.
February 11, 2017: Nature
https://www.readbyqxmd.com/read/28199143/randomized-trial-comparing-r-chop-versus-high-dose-sequential-chemotherapy-in-high-risk-patients-with-diffuse-large-b-cell-lymphomas
#3
Sergio Cortelazzo, Corrado Tarella, Alessandro Massimo Gianni, Marco Ladetto, Anna Maria Barbui, Andrea Rossi, Giuseppe Gritti, Paolo Corradini, Massimo Di Nicola, Caterina Patti, Antonino Mulé, Manuela Zanni, Valerio Zoli, Atto Billio, Andrea Piccin, Giovanni Negri, Claudia Castellino, Francesco Di Raimondo, Andrés J M Ferreri, Fabio Benedetti, Giorgio La Nasa, Guido Gini, Livio Trentin, Maurizio Frezzato, Leonardo Flenghi, Simona Falorio, Marco Chilosi, Riccardo Bruna, Valentina Tabanelli, Stefano Pileri, Arianna Masciulli, Federica Delaini, Cristina Boschini, Alessandro Rambaldi
Purpose The benefit of high-dose chemotherapy with autologous stem-cell transplantation (ASCT) as first-line treatment in patients with diffuse large B-cell lymphomas is still a matter of debate. To address this point, we designed a randomized phase III trial to compare rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP)-14 (eight cycles) with rituximab plus high-dose sequential chemotherapy (R-HDS) with ASCT. Patients and Methods From June 2005 to June 2011, 246 high-risk patients with a high-intermediate (56%) or high (44%) International Prognostic Index score were randomly assigned to the R-CHOP or R-HDS arm, and 235 were analyzed by intent to treat...
November 20, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28195575/a-land-data-assimilation-system-for-sub-saharan-africa-food-and-water-security-applications
#4
Amy McNally, Kristi Arsenault, Sujay Kumar, Shraddhanand Shukla, Pete Peterson, Shugong Wang, Chris Funk, Christa D Peters-Lidard, James P Verdin
Seasonal agricultural drought monitoring systems, which rely on satellite remote sensing and land surface models (LSMs), are important for disaster risk reduction and famine early warning. These systems require the best available weather inputs, as well as a long-term historical record to contextualize current observations. This article introduces the Famine Early Warning Systems Network (FEWS NET) Land Data Assimilation System (FLDAS), a custom instance of the NASA Land Information System (LIS) framework. The FLDAS is routinely used to produce multi-model and multi-forcing estimates of hydro-climate states and fluxes over semi-arid, food insecure regions of Africa...
February 14, 2017: Scientific Data
https://www.readbyqxmd.com/read/28195030/extra-terra-incognita-martian-maps-in-the-digital-age
#5
Lisa Messeri
Science and technology studies (STS) and critical cartography are both asking questions about the ontological fixity of maps and other scientific objects. This paper examines how a group of NASA computer scientists who call themselves The Mapmakers conceptualizes and creates maps in service of different commitments. The maps under construction are those of alien Mars, produced through partnerships that NASA has established with Google and Microsoft. With the goal of bringing an experience of Mars to as many people as possible, these maps influence how we imagine our neighbouring planet...
February 2017: Social Studies of Science
https://www.readbyqxmd.com/read/28190372/training-performance-of-laparoscopic-surgery-in-two-and-three-dimensional-displays
#6
Chiuhsiang Joe Lin, Chih-Feng Cheng, Hung-Jen Chen, Kuan-Ying Wu
INTRODUCTION: This research investigated differences in the effects of a state-of-art stereoscopic 3-dimensional (3D) display and a traditional 2-dimensional (2D) display in simulated laparoscopic surgery over a longer duration than in previous publications and studied the learning effects of the 2 display systems on novices. METHODS: A randomized experiment with 2 factors, image dimensions and image sequence, was conducted to investigate differences in the mean movement time, the mean error frequency, NASA-TLX cognitive workload, and visual fatigue in pegboard and circle-tracing tasks...
February 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28188792/recruitment-of-pp1-to-the-centrosomal-scaffold-protein-cep192
#7
Isha Nasa, Laura Trinkle-Mulcahy, P Douglas, Sibapriya Chaudhuri, S Lees-Miller, Kyung S Lee, Greg B Moorhead
Centrosomal protein of 192 kDa (CEP192) is a scaffolding protein that recruits the mitotic protein kinases Aurora A and PLK1 to the centrosome. Here we demonstrate that CEP192 also recruits the type one protein phosphatase (PP1) via a highly conserved KHVTF docking motif. The threonine of the KHVTF motif is phosphorylated during mitosis and protein kinase inhibition studies suggest this to be a PLK1-dependent process.
February 7, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28184097/the-abundance-of-c2h4-in-the-circumstellar-envelope-of-irc-10216
#8
J P Fonfría, K H Hinkle, J Cernicharo, M J Richter, M Agúndez, L Wallace
High spectral resolution mid-IR observations of ethylene (C2H4) towards the AGB star IRC+10216 were obtained using the Texas Echelon Cross Echelle Spectrograph (TEXES) at the NASA Infrared Telescope Facility (IRTF). Eighty ro-vibrational lines from the 10.5 µm vibrational mode ν7 with J ≲ 30 were detected in absorption. The observed lines are divided into two groups with rotational temperatures of 105 and 400 K (warm and hot lines). The warm lines peak at ≃ -14 km s(-1) with respect to the systemic velocity, suggesting that they are mostly formed outwards from ≃ 20R⋆...
February 1, 2017: Astrophysical Journal
https://www.readbyqxmd.com/read/28166891/intraocular-pressure-is-sensitive-to-cumulative-and-instantaneous-mental-workload
#9
Jesús Vera, Raimundo Jiménez, José Antonio García, David Cárdenas
We used a repeated-measures design to assess the impact of mental-task complexity on intraocular pressure (IOP). Fourteen participants performed three continuous 11-min blocks of a mental-workload task (3-back) and an oddball version of this task. Also, heart-rate variability (HRV), cognitive-performance scores, and subjective measure of mental load (NASA-TLX) were determined. IOP was taken before each block and afterwards as well as after recovery from mental tasks. We found that IOP increased during heavy mental workloads (p < 0...
April 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28166885/a-colored-petri-nets-based-workload-evaluation-model-and-its-validation-through-multi-attribute-task-battery-ii
#10
Peng Wang, Weining Fang, Beiyuan Guo
This paper proposed a colored petri nets based workload evaluation model. A formal interpretation of workload was firstly introduced based on the process that reflection of petri nets components to task. A petri net based description of Multiple Resources theory was given by comprehending it from a new angle. A new application of VACP rating scales named V/A-C-P unit, and the definition of colored transitions were proposed to build a model of task process. The calculation of workload mainly has the following four steps: determine token's initial position and values; calculate the weight of directed arcs on the basis of the rules proposed; calculate workload from different transitions, and correct the influence of repetitive behaviors...
April 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28158108/linear-variable-filters-for-nasa-s-ovirs-instrument-pushing-the-envelope-of-blocking
#11
Karen Hendrix
The NASA OVIRS spectrometer provides high resolving power spectra over a broad wavelength region: 0.4-4.3 μm, in a compact assembly. Thick, complex blocker designs (up to 153 μm, 1839 layers) and precision manufacturing enable this performance.
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28158107/narrow-band-multi-filter-radiometer-for-total-ozone-content-measurements-mario-zucchelli-station-antarctica-campaign
#12
Salvatore Scaglione, Danilo Zola, Francesca Menchini, Ilaria Di Sarcina
The importance of ground-based measurements of ultraviolet radiation has increased since the discovery of the stratospheric ozone layer depletion. Spectroradiometers are the most widely used class of instruments, although the requirement to work in attended stations is sometimes limiting. In this work we present a filter radiometer, named F-RAD, with good optical stability, very short sampling time (1 min), and proven reliability. The instrument is based on a stand-alone functioning, making it suitable for operation in hostile environments...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28149034/acute-pesticide-ingestion-managed-with-yohimbine-as-a-rescue-therapy
#13
Prashant Nasa, Deven Juneja
Amitraz is used as a pesticide in agricultural and veterinary medicine. It is primarily a central α2 adrenergic agonist and known to cause central nervous system depression, convulsions, respiratory depression, and bradycardia on severe intoxication. We report a case of a 3-year-old child who presented with accidental ingestion of amitraz solution with signs of severe poisoning. There is no specific antidote of amitraz poisoning in humans, however, animal experiments with α2 adrenergic antagonists such as yohimbine and atimepazole have been successful...
December 2016: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28146678/measuring-sustained-attention-and-perceived-workload
#14
Cynthia Laurie-Rose, Lori M Curtindale, Meredith Frey
OBJECTIVE: We examined the effects of spatial uncertainty, field dependence/independence (FD/I), and sex on vigilance performance and perceived workload in elementary school children. BACKGROUND: Building on previous work in which children demonstrated their ability to evaluate workload, we tested whether spatial-uncertainty manipulations in a vigilance task would elicit in children the same deleterious effects on performance and workload as it does with adults...
February 2017: Human Factors
https://www.readbyqxmd.com/read/28145691/spatial-distribution-of-ozone-formation-in-china-derived-from-emissions-of-speciated-volatile-organic-compounds
#15
Rongrong Wu, Shaodong Xie
Ozone (O3) pollution is becoming increasingly severe in China. In addition, our limited understanding of the relationship between O3 and volatile organic compounds (VOCs), is an obstacle to improving air quality. By developing an improved source-oriented speciated VOC emission inventory in 2013, we estimated the ozone formation potential (OFP) and investigated its characteristics in China. Besides, a comparison was made between our estimates and space-based observations from the ozone monitoring instrument (OMI) on the National Aeronautics and Space Administration (NASA)'s Aura satellite...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28143831/complex-patterns-of-multiple-biomineralization-in-single-celled-plant-trichomes-of-the-loasaceae
#16
Hans-Jürgen Ensikat, Adeel Mustafa, Maximilian Weigend
PREMISE OF THE STUDY: Plants of the family Loasaceae are characterized by a usually dense indument of various trichome types, including two basically different types of mineralized, unicellular trichomes (stinging hairs or setae and scabrid-glochidiate trichomes). Mineralized trichomes have long been known to have silicified or calcified walls, but recent studies demonstrated that trichomes of Loasaceae may also contain calcium phosphate. The current study investigates the distribution of different biominerals in the mineralized trichomes across several different taxa...
January 31, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28128789/the-sensitivity-of-galvanic-skin-response-for%C3%A2-assessing-mental-workload-in-indonesia
#17
Ari Widyanti, Khoirul Muslim, Iftikar Zahedi Sutalaksana
BACKGROUND: Objective measures have been shown to be equally sensitive in different cultures. However, these measures need special devices that are relatively expensive and need expertise to analyze the result. In Indonesia, there is a need for a sensitive and affordable mental workload measure. OBJECTIVE: To evaluate the sensitivity of Galvanic Skin Response (GSR) in assessing mental workload in Indonesia. PARTICIPANTS: A total of 72 Indonesian students with normal visual capability...
January 23, 2017: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/28128778/the-contributions-of-occupational-science-to%C3%A2-the-readiness-of-long-duration-deep-space-exploration
#18
Janis Davis, Macy Burr, Maria Absi, Rochelle Telles, Howard Koh
BACKGROUND: This study introduces the contributions of occupational science (OS) to the preparation and support of astronauts during long duration space exploration. Given the hostile environment of space, it is not surprising that there is grave deterioration of both physical and mental health when off Earth. However, OS, through occupational therapy (OT), can identify strategies that maintain health and minimize disruptions in task performance for mission success. OBJECTIVE: To determine the gaps in NASA's preparation of astronauts for long duration space exploration and the viable contributions of OT...
January 23, 2017: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/28113842/mercury-ion-clock-for-a-nasa-technology-demonstration-mission
#19
Robert Tjoelker, John Prestage, Eric Burt, Pin Chen, Yong Chong, Sang Chung, William Diener, Todd Ely, Daphna Enzer, Hadi Mojaradi, Clayton Okino, Mike Pauken, David Robison, Brad Swenson, Blake Tucker, R Wang
There are many different atomic frequency standard technologies but few meet the demanding performance, reliability, size, mass, and power constraints required for space operation. JPL is developing a linear ion trap based mercury ion clock, referred to as DSAC (Deep Space Atomic Clock) under NASA's Technology Demonstration Mission (TDM) program. This clock is expected to provide a new capability with broad application to space based navigation and science. A one year flight demonstration is planned as a hosted payload following an early 2017 launch...
March 21, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28095954/predicting-air-quality-at-first-ingress-into-vehicles-visiting-the-international-space-station
#20
Amelia A Romoser, Robert R Scully, Thomas F Limero, Vanessa De Vera, Patti F Cheng, Jennifer J Hand, John T James, Valerie E Ryder
INTRODUCTION: NASA regularly performs ground-based offgas tests (OGTs), which allow prediction of accumulated volatile pollutant concentrations at first entry on orbit, on whole modules and vehicles scheduled to connect to the International Space Station (ISS). These data guide crew safety operations and allow for estimation of ISS air revitalization systems impact from additional pollutant load. Since volatiles released from vehicle, module, and payload materials can affect crew health and performance, prediction of first ingress air quality is important...
February 1, 2017: Aerospace Medicine and Human Performance
keyword
keyword
11234
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"