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M David Keller, John M Ziriax, William Barns, Benjamin Sheffield, Douglas Brungart, Tony Thomas, Bobby Jaeger, Kurt Yankaskas
Noise, hearing loss, and electronic signal distortion, which are common problems in military environments, can impair speech intelligibility and thereby jeopardize mission success. The current study investigated the impact that impaired communication has on operational performance in a command and control environment by parametrically degrading speech intelligibility in a simulated shipborne Combat Information Center. Experienced U.S. Navy personnel served as the study participants and were required to monitor information from multiple sources and respond appropriately to communications initiated by investigators playing the roles of other personnel involved in a realistic Naval scenario...
October 19, 2016: Hearing Research
Soyoung Kim, Jonggul Lee, Eunok Jung
A mathematical model for the transmission dynamics of the 2009 A/H1N1 influenza epidemic in the Republic of Korea is developed. The simulation period is separated into three consecutive periods based on the government's intervention strategies: the nonpharmaceutical strategy is used during Period 1. The nonpharmaceutical and antiviral strategies are executed during Period 2 and the vaccine strategy is added during Period 3. During Period 1, we estimate the reduction in the transmission rate due to the government's intervention policies as a difference between the data-fitted and uncontrolled transmission rate that is derived from the basic reproductive number, R0, of the model without intervention...
October 18, 2016: Journal of Theoretical Biology
Birga Maier, Katrin Wagner, Steffen Behrens, Leonhard Bruch, Reinhard Busse, Dagmar Schmidt, Helmut Schühlen, Roland Thieme, Heinz Theres
BACKGROUND: Assessment of quality of care in patients with myocardial infarction (MI) should be based on data that effectively enable determination of quality. With the need to simplify measurement techniques, the question arises whether routine data can be used for this purpose. We therefore compared data from a German sickness fund (AOK) with data from the Berlin Myocardial Infarction Registry (BMIR). METHODS: We included patients hospitalised for treatment of MI in Berlin from 2009-2011...
October 21, 2016: BMC Health Services Research
R Stannarius, K Harth
Disclinations in liquid crystals bear striking analogies to defect structures in a wide variety of physical systems, and their straightforward optical observability makes them excellent models to study fundamental properties of defect interactions. We employ freely suspended smectic-C films, which behave as quasi-two-dimensional polar nematics. A procedure to capture high-strength disclinations in localized spots is introduced. These disclinations are released in a controlled way, and the motion of the mutually repelling topological charges with strength +1 is studied quantitatively...
October 7, 2016: Physical Review Letters
Dureid Qazzazie, Mohammad Halhouli, Olena Yurchenko, Gerald Urban
The lack of performance of graphene-based electrocatalysts for oxygen reduction (ORR) is a major concern for fuel cells which can be mastered using nanocomposites. This work is highlighted by the optimization of nitrogen(N)-doped graphene/carbon nanotubes (CNTs) nanocomposite's ORR performance examined by galvanostatic measurements in realistically approached glucose half-cells. Obtained results mark an essential step for the development of nanocarbon-based cathodes, as we specifically evaluate the electrode performance under real fuel cell conditions...
October 21, 2016: Nanotechnology
James Raftery, Steve Hanney, Trish Greenhalgh, Matthew Glover, Amanda Blatch-Jones
BACKGROUND: This report reviews approaches and tools for measuring the impact of research programmes, building on, and extending, a 2007 review. OBJECTIVES: (1) To identify the range of theoretical models and empirical approaches for measuring the impact of health research programmes; (2) to develop a taxonomy of models and approaches; (3) to summarise the evidence on the application and use of these models; and (4) to evaluate the different options for the Health Technology Assessment (HTA) programme...
October 2016: Health Technology Assessment: HTA
Moira S Lewitt, Emma Strage, David Church
BACKGROUND: Achieving insulin independence is emerging as a realistic therapeutic goal in the management of feline diabetes mellitus. CASE PRESENTATION: The management of an 11-year-old spayed female Burmese cat presenting with diabetes mellitus after corticosteroid administration is described. Remission was achieved after the frequency of insulin administration was increased to four times a day, and supported by intensive home blood glucose monitoring and a high protein, low carbohydrate diet...
October 20, 2016: Acta Veterinaria Scandinavica
Marisa Elena Domino, Mona Kilany, Rebecca Wells, Joseph P Morrissey
OBJECTIVE: To examine whether medical homes have heterogeneous effects in different subpopulations, leveraging the interpretations from a variety of statistical techniques. DATA SOURCES/STUDY SETTING: Secondary claims data from the NC Medicaid program for 2004-2007. The sample included all adults with diagnoses of schizophrenia, bipolar disorder, or major depression who were not dually enrolled in Medicare or in a nursing facility. STUDY DESIGN: We modeled a number of monthly service use, adherence, and expenditure outcomes using fixed effects, generalized estimating equation with and without inverse probability of treatment weights, and instrumental variables analyses...
October 21, 2016: Health Services Research
Michael D Nicholson, Tibor Antal
Deterministically growing (wild-type) populations which seed stochastically developing mutant clones have found an expanding number of applications from microbial populations to cancer. The special case of exponential wild-type population growth, usually termed the Luria-Delbrück or Lea-Coulson model, is often assumed but seldom realistic. In this article, we generalise this model to different types of wild-type population growth, with mutants evolving as a birth-death branching process. Our focus is on the size distribution of clones-that is the number of progeny of a founder mutant-which can be mapped to the total number of mutants...
October 20, 2016: Bulletin of Mathematical Biology
Rafael Vilhena de Carvalho Fürst, Afonso César Polimanti, Sidnei José Galego, Maria Claudia Bicudo, Erik Montagna, João Antônio Corrêa
OBJECTIVE: To present a simple and affordable model able to properly simulate an ultrasound-guided venous access. DESIGN: The simulation was made using a latex balloon tube filled with water and dye solution implanted in a thawed chicken breast with bones. RESULTS: The presented model allows the simulation of all implant stages of a central catheter. The obtained echogenicity is similar to that observed in human tissue, and the ultrasound identification of the tissues, balloon, needle, wire guide and catheter is feasible and reproducible...
October 20, 2016: World Journal of Surgery
Emmanuel Mandonnet, Juan Martino, Silvio Sarubbo, Francesco Corrivetti, Schahraed Bouazza, Damien Bresson, Hugues Duffau, Sebastien Froelich
BACKGROUND: Advances in the oncological and functional results of insular surgery have been reported recently. Such successes have been made possible by the advent of the transopercular approach under awake monitoring and by the improved anatomical and functional knowledge of the white matter pathways surrounding the insula. Nonetheless, given the rarity of insular tumors, it is difficult to get familiar with the complex 3D anatomy of the different neuronal and vascular structures encountered during a transopercular insular resection...
October 17, 2016: World Neurosurgery
Teresa M Attina, Russ Hauser, Sheela Sathyanarayana, Patricia A Hunt, Jean-Pierre Bourguignon, John Peterson Myers, Joseph DiGangi, R Thomas Zoeller, Leonardo Trasande
BACKGROUND: Endocrine-disrupting chemicals (EDCs) contribute to disease and dysfunction and incur high associated costs (>1% of the gross domestic product [GDP] in the European Union). Exposure to EDCs varies widely between the USA and Europe because of differences in regulations and, therefore, we aimed to quantify disease burdens and related economic costs to allow comparison. METHODS: We used existing models for assessing epidemiological and toxicological studies to reach consensus on probabilities of causation for 15 exposure-response relations between substances and disorders...
October 17, 2016: Lancet Diabetes & Endocrinology
Suzanne V Arnold, Jonathan Afilalo, John A Spertus, Yuanyuan Tang, Suzanne J Baron, Philip G Jones, Michael J Reardon, Steven J Yakubov, David H Adams, David J Cohen
BACKGROUND: A series of models have been developed to identify patients at high risk for poor outcomes after transcatheter aortic valve replacement (TAVR) to help guide treatment choices, offer patients realistic expectations of long-term outcomes, and support decision making. OBJECTIVES: This study examined the performance of the previously developed TAVR Poor Outcome risk models in an external dataset and explored the incremental contribution of geriatric domains to model performance...
October 25, 2016: Journal of the American College of Cardiology
Yongseok Yoo, Woori Kim
Neural systems are inherently noisy. One well-studied example of a noise reduction mechanism in the brain is the population code, where representing a variable with multiple neurons allows the encoded variable to be recovered with fewer errors. Studies have assumed ideal observer models for decoding population codes, and the manner in which information in the neural population can be retrieved remains elusive. This letter addresses a mechanism by which realistic neural circuits can recover encoded variables...
October 20, 2016: Neural Computation
Marek Sramko, Dan Wichterle, Josef Kautzner
This study evaluated hemodynamic feasibility and reproducibility of a new method for in vivo simulation of human atrial fibrillation (AF). The method was tested during sinus rhythm in 10 patients undergoing catheter ablation for AF. A simple electronic device was assembled that allowed triggering a cardiac stimulator by predefined series of RR intervals. Irregular RR interval sequences with a mean heart rate of 90/min and 130/min were obtained from ECG recordings of another patients with AF. Simultaneous atrioventricular pacing was delivered by catheters placed inside the coronary sinus and at the His bundle region...
2016: PloS One
Anna B Cope, Catalina Ramirez, Robert F DeVellis, Robert Agans, Victor J Schoenbach, Adaora A Adimora
BACKGROUND: Concurrent sexual partnerships (partnerships that overlap in time) may contribute to higher rates of HIV transmission in African Americans. Attitudes toward a behavior constitute an important component of most models of health-related behavior and behavioral change. We have developed a scale, employing realistic vignettes that appear to reliably measure attitudes about concurrency in young African American adults. METHODS: Vignette-based items to assess attitudes about concurrency were developed following focus groups and cognitive testing of items adapted from existing scales assessing psychosocial constructs surrounding related sexual behaviors...
2016: PloS One
David Samuel Johnson, R Scott Warren, Linda A Deegan, Thomas J Mozdzer
In saltmarsh plant communities, bottom-up pressure from nutrient enrichment is predicted to increase productivity, alter community structure, decrease biodiversity, and alter ecosystem functioning. Previous work supporting these predictions has been based largely on short-term, plot-level (e.g., 1-300 m(2) ) studies, which may miss landscape-level phenomena that drive ecosystem-level responses. We implemented an ecosystem-scale, nine-year nutrient experiment to examine how saltmarsh plants respond to simulated conditions of coastal eutrophication...
July 27, 2016: Ecological Applications: a Publication of the Ecological Society of America
Y Amerlinck, W De Keyser, G Urchegui, I Nopens
At wastewater treatment plants (WWTPs) aeration is the largest energy consumer. This high energy consumption requires an accurate assessment in view of plant optimization. Despite the ever increasing detail in process models, models for energy production still lack detail to enable a global optimization of WWTPs. A new dynamic model for a more accurate prediction of aeration energy costs in activated sludge systems, equipped with submerged air distributing diffusers (producing coarse or fine bubbles) connected via piping to blowers, has been developed and demonstrated...
October 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Laiyuan Wang, Zhiyong Wang, Jinyi Lin, Jie Yang, Linghai Xie, Mingdong Yi, Wen Li, Haifeng Ling, Changjin Ou, Wei Huang
Most simulations of neuroplasticity in memristors, which are potentially used to develop artificial synapses, are confined to the basic biological Hebbian rules. However, the simplex rules potentially can induce excessive excitation/inhibition, even collapse of neural activities, because they neglect the properties of long-term homeostasis involved in the frameworks of realistic neural networks. Here, we develop organic CuPc-based memristors of which excitatory and inhibitory conductivities can implement both Hebbian rules and homeostatic plasticity, complementary to Hebbian patterns and conductive to the long-term homeostasis...
October 20, 2016: Scientific Reports
Tina Gupta, Steven M Silverstein, Jessica A Bernard, Brian P Keane, Thomas V Papathomas, Andrea Pelletier-Baldelli, Derek J Dean, Raeana E Newberry, Ivanka Ristanovic, Vijay A Mittal
Patients with psychosis exhibit a reduced susceptibility to depth inversion illusions (DII) in which a physically concave surface is perceived as convex (e.g., the hollow mask illusion). Here, we examined the extent to which lessened susceptibility to DII characterized youth at ultra high risk (UHR) for psychosis. In this study, 44 UHR participants and 29 healthy controls judged the apparent convexity of face-like human masks, two of which were concave and the other convex. One of the concave masks was painted with realistic texture to enhance the illusion; the other was shown without such texture...
2016: NeuroImage: Clinical
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