Formulation of a new class of fractional-step methods for the incompressible MHD equations that retains the long-term dissipativity of the continuum..

1996 ◽  
pp. 1-23 ◽  
Author(s):  
F Armero ◽  
J Simo
Keyword(s):  
Mhd Equations ◽  
Fractional Step ◽  
New Class ◽  
Incompressible Mhd ◽  
The Continuum

scholarly journals Leopard Density Estimation within an Enclosed Reserve, Namibia Using Spatially Explicit Capture-Recapture Models

Animals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 724
Author(s):  
Noack ◽  
Heyns ◽  
Rodenwoldt ◽  
Edwards
Keyword(s):  
Management Strategies ◽  
Camera Traps ◽  
Spatially Explicit ◽  
Conservation Areas ◽  
Term Survival ◽  
New Class ◽  
Capture Recapture ◽  
Wildlife Populations ◽  
Effective Conservation

The establishment of enclosed conservation areas are claimed to be the driving force for the long-term survival of wildlife populations. Whilst fencing provides an important tool in conservation, it simultaneously represents a controversial matter as it stops natural migration processes, which could ultimately lead to inbreeding, a decline in genetic diversity and local extinction if not managed correctly. Thus, wildlife residing in enclosed reserves requires effective conservation and management strategies, which are strongly reliant on robust population estimates. Here, we used camera traps combined with the relatively new class of spatially explicit capture-recaptured models (SECR) to produce the first reliable leopard population estimate for an enclosed reserve in Namibia. Leopard density was estimated at 14.51 leopards/100 km2, the highest recorded density in Namibia to date. A combination of high prey abundance, the absence of human persecution and a lack of top-down control are believed to be the main drivers of the recorded high leopard population. Our results add to the growing body of literature which suggests enclosed reserves have the potential to harbour high densities and highlight the importance of such reserves for the survival of threatened species in the future.

Is Age the New Class? Economic Crisis and Demographics in European Politics

2016 ◽  
Vol 43 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Jan Erk
Keyword(s):  
Age Groups ◽  
The Political ◽  
Economic Downturn ◽  
New Class ◽  
Political Landscape ◽  
Younger Age ◽  
Material Interests ◽  
Post War ◽  
The Welfare State

As the crisis turns into long-term economic downturn, younger age-groups in Europe seem to be hit with higher levels of unemployment while the welfare state is steadily shrinking. The young have suddenly become a social group united by collective material interests, but does this translate into a sense of a collective political interest? The paper examines to what extent the dominant class-based social science of the post-war years can help us understand the politics of age-groups. The analysis highlights four changes since post-war years: the workplace has changed, impacting socialization; modern media has changed, impacting mobilization; the political landscape is fairly institutionalized, tempering the possibilities for new political concerns to find voice; and those who would define and articulate the political priorities of the young are leaving the Old Continent.

scholarly journals Evaluating Bayesian radiocarbon-dated event-count [REC] models for the study of long-term human and environmental processes

2020 ◽  
Author(s):  
William Christopher Carleton
Keyword(s):  
Forest Fires ◽  
Simulated Data ◽  
Radiocarbon Date ◽  
Radiocarbon Dates ◽  
New Class ◽  
Environmental Processes ◽  
Growth Decline ◽  
Marine Ingression ◽  
Event Times

Chronological uncertainty complicates attempts to use radiocarbon dates as proxies for processes like human population growth/decline, forest fires, and marine ingression. Established approaches involve turning databases of radiocarbon-date densities into single summary proxies that cannot fully account for chronological uncertainty. Here, I use simulated data to explore an alternate Bayesian approach that instead models the data as what they are, namely radiocarbon-dated event-counts. The approach involves assessing possible event-count sequences by sampling radiocarbon date densities and then applying MCMC to estimate the parameters of an appropriate count-based regression model. The regressions based on individual sampled sequences were placed in a multilevel framework, which allowed for the estimation of hyperparameters that account for chronological uncertainty in individual event times. Two processes were used to produce simulated data. One represented a simple monotonic change in event-counts and the other was based on a real palaeoclimate proxy record. In both cases, the method produced estimates that had the correct sign and were consistently biased toward zero. These results indicate that the approach is widely applicable and could form the basis of a new class of quantitative models for use in exploring long-term human and environmental processes.

scholarly journals Profiling Suicide Exposure Risk Factors for Psychological Distress: An Empirical Test of the Proposed Continuum of Survivorship Model

2021 ◽  
Vol 12 ◽  
Author(s):  
Navjot Bhullar ◽  
Rebecca L. Sanford ◽  
Myfanwy Maple
Keyword(s):  
Risk Factors ◽  
Psychological Distress ◽  
Latent Profile Analysis ◽  
Community Sample ◽  
Exposure Risk ◽  
Suicide Death ◽  
Proposed Model ◽  
Survivorship Model ◽  
The Continuum

The Continuum of Survivorship proposes a way in which individuals may experience the suicide death of someone known to them along a continuum from being exposed to the death through to long-term bereavement. The present study provides a first empirical testing of the proposed model in an Australian community sample exposed to suicide. Using a Latent Profile Analysis, we tested the suicide exposure risk factors (time since death, frequency of pre-death contact, reported closeness, and perceived impact) to map to the Continuum of Survivorship model. Results revealed identification of five profiles, with four ranging from suicide exposed to suicide bereaved long-term broadly aligning with the proposed model, with one further profile being identified that represented a discordant profile of low closeness and high impact of suicide exposure. Our findings demonstrate that while the proposed model is useful to better understand the psychological distress related to exposure to suicide, it cannot be used as “shorthand” for identifying those who will be most distressed, nor those who may most likely need additional support following a suicide death. Implications and future research directions are discussed.

scholarly journals Quantification of Internal Filtration in Hollow Fiber Hemodialyzers with Medium Cut-Off Membrane

2018 ◽  
Vol 46 (3) ◽  
pp. 196-204 ◽  
Author(s):  
Anna Lorenzin ◽  
Mauro Neri ◽  
Andrea Lupi ◽  
Martina Todesco ◽  
Monica Santimaria ◽  
...  
Keyword(s):  
Nuclear Imaging ◽  
Chronic Hemodialysis ◽  
Transmembrane Pressure ◽  
Hydraulic Permeability ◽  
Dialysate Flow ◽  
New Class ◽  
Inner Diameter ◽  
Marker Molecule

Background: Inadequate removal of molecules between 5 and 50 KDa may cause long-term complication in chronic hemodialysis. Medium cut-off (MCO) is a new class of membranes with enhanced sieving properties and negligible albumin loss. MCO membrane makes it possible to perform expanded hemodialysis (HDx), a technique based on high internal filtration (IF).The present study is designed to quantify IF in 2 MCO dialyzers (Theranova 400 and 500, Baxter, Deerfield, USA) using a nuclear imaging technique previously validated. Methods: Blood and dialysate compartment pressure drop along with transmembrane pressure; they were measured in a closed in vitro circuit with human blood (blood flow [QB] = 300 and 400 mL/min; dialysate flow 500 mL/min; net ultrafiltration rate 0 mL/min). A non-diffusible marker molecule (albumin macro-aggregates labeled with 99Tc metastable) was injected in the blood compartment and nuclear emission was recorded by a gamma camera. Relative variations in the concentration of the marker molecule along the length of the filter were used to calculate local cross filtration. Results: Based on marker concentration profiles, IF was estimated. For Theranova 400, IF were 29.7 and 41.6 mL/min for QB of 300 and 400 mL/min. For Theranova 500, IF were 31.6 and 53.1 mL/min for QB of 300 and 400 mL/min respectively. Conclusions: MCO membrane provides significant amounts of IF due to the particular combination between hydraulic permeability of the membrane and reduced inner diameter of the fibers. High IF combined with enhanced sieving profile of MCO membrane leads to improved removal of a wider spectrum of uremia retention molecules in HDx, without requiring complex equipment.

Visible Light-Activatable Q-dye Molecular Beacons for Long-Term mRNA Monitoring in Neurons

2021 ◽  
Author(s):  
Robin Klimek ◽  
Paul Donlin-Asp ◽  
Claudio Polisseni ◽  
Vanessa Hanff ◽  
Erin Schuman ◽  
...  
Keyword(s):  
Visible Light ◽  
Hippocampal Neurons ◽  
Molecular Beacons ◽  
New Class ◽  
Monitoring Time

Herein, we present a new class of Q-dye molecular beacons (MBs) that can be locally activated with visible light in hippocampal neurons. Our novel architecture increases the available monitoring time...

Characterization of TAPE-Gelatin as a Potential Bioadhesive

2020 ◽  
Vol 833 ◽  
pp. 189-193
Author(s):  
Angelica Aira A. Ayalin ◽  
Bernell Merwyn S. Go ◽  
Gail Edselle S. Reyes ◽  
Terence Tumolva
Keyword(s):  
Inguinal Hernia ◽  
Production Cost ◽  
Long Term Results ◽  
Medical Field ◽  
Hernia Sac ◽  
New Class ◽  
New Material ◽  
Medical Adhesive

Bioadhesives have much potential in the medical field as an alternative to sutures in internal surgery. They are easier to use and have better long-term results. Improvement of a new class of adhesives, tannic acid-polyethylene glycol (TAPE), was done by mixing it with gelatin, since it was found that TAPE alone could not be applied to certain internal applications like in inguinal hernia. It failed to close a fresh inguinal hernia sac. Characterization tests were done on the new material, TAPE-gelatin, which proved to have a tissue adhesion strength of 0.41 MPa which is 5 times greater than fibrin glue, good blood biocompatibility with blood clotting index of 97.46%, burst pressure strength that can withstand 1000 mL that is 10 times more than the volume in the peritoneal cavity, and cheaper, with a production cost of Php28.50, than commercially available bioadhesives, which can reach up to Php2,000 – Php30,000 per application. With its desirable properties, cheaper production cost, and large potential for scalability, TAPE-gelatin as a new candidate for medical adhesive was established.

scholarly journals The Efficacy of Iron Chelators for Removing Iron from Specific Brain Regions and the Pituitary—Ironing out the Brain

2019 ◽  
Vol 12 (3) ◽  
pp. 138 ◽  
Author(s):  
Robert R. Crichton ◽  
Roberta J. Ward ◽  
Robert C. Hider
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Iron Chelation ◽  
Brain Regions ◽  
Beta Thalassemia ◽  
Excess Iron ◽  
New Class ◽  
Clinical Conditions ◽  
The Brain

Iron chelation therapy, either subcutaneous or orally administered, has been used successfully in various clinical conditions. The removal of excess iron from various tissues, e.g., the liver spleen, heart, and the pituitary, in beta thalassemia patients, has become an essential therapy to prolong life. More recently, the use of deferiprone to chelate iron from various brain regions in Parkinson’s Disease and Friederich’s Ataxia has yielded encouraging results, although the side effects, in <2% of Parkinson’s Disease(PD) patients, have limited its long-term use. A new class of hydroxpyridinones has recently been synthesised, which showed no adverse effects in preliminary trials. A vital question remaining is whether inflammation may influence chelation efficacy, with a recent study suggesting that high levels of inflammation may diminish the ability of the chelator to bind the excess iron.

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