61,553 research outputs found
A method for precision anodize stripping
Felt templates saturated with etch solution remove anodized finish from aluminum without damage to the surface. The solution is a combination of nitric acid, chromic acid, and hydrofluoric acid
Data communications and monitor for the Penn State University profiler network
The profiler network installed by the Department of Meteorology at Penn State University utilizes a microcomputer for network monitoring and control. The network consists of two VHF and one UHF wind profiling Doppler radars. Additional measurement systems added to the network include temperature and humidity profiling radiometers, sodar for boundary layer wind profiling and selected surface based baseline systems. Remote diagnostic capabilities were also implemented in the Penn State network. It is possible to remotely analyze many specific malfunctions of the transmitter or signal processor
Top Quark Studies at D0
Years after its discovery in 1995 by CDF and D0, the top quark still
undergoes intense investigations at the Tevatron. Using up to the full Run~II
data sample, new measurements of top quark production and properties by the D0
Collaboration are presented. In particular, the first observation of single top
quark s-channel production, the measurement of differential ttbar
distributions, forward-backward ttbar asymmetry, a new measurement of the top
quark mass, and a measurement of the top quark charge are discussed.Comment: 4 pages, 2 figures, proceedings for BEACH2014 conference, Birmingham,
U
Earthsongs: ecopoetics, Heidegger and dwelling
This paper discusses the notion of ecopoetics in relation to the work of Martin Heidegger and his concept of dwelling. Our aim, broadly stated, is to respond to the question: "What frame of mind could bring about sustainability - and how might we develop it?" In the first part of the paper, we comment on Jonathan Bate's notion of ecopoetics and his discussion of Heidegger. Crucial here is the question of whether we can ever approach Nature in an non-ideological way or are all attempts to capture Nature, theoretically or poetically or narratively, nothing more than our own peculiar appropriation of it? Ecopoetics might be conceived as a response to this question, although we dispute Bate's view. In the second part of the paper, following Micheal Haar's perceptive reading, we elaborate the four senses that Heidegger gives to Nature, and in the third section, we make some concluding comments about the notion of sustainability that might be explicated in relation to Heidegger's four senses of Nature
Analytical investigations of laminar separations using the ''Crocco-Lees mixing parameter'' method
Analytical studies of laminar separations using Crocco-Lees mixing parameter metho
Ecological non-linear state space model selection via adaptive particle Markov chain Monte Carlo (AdPMCMC)
We develop a novel advanced Particle Markov chain Monte Carlo algorithm that
is capable of sampling from the posterior distribution of non-linear state
space models for both the unobserved latent states and the unknown model
parameters. We apply this novel methodology to five population growth models,
including models with strong and weak Allee effects, and test if it can
efficiently sample from the complex likelihood surface that is often associated
with these models. Utilising real and also synthetically generated data sets we
examine the extent to which observation noise and process error may frustrate
efforts to choose between these models. Our novel algorithm involves an
Adaptive Metropolis proposal combined with an SIR Particle MCMC algorithm
(AdPMCMC). We show that the AdPMCMC algorithm samples complex, high-dimensional
spaces efficiently, and is therefore superior to standard Gibbs or Metropolis
Hastings algorithms that are known to converge very slowly when applied to the
non-linear state space ecological models considered in this paper.
Additionally, we show how the AdPMCMC algorithm can be used to recursively
estimate the Bayesian Cram\'er-Rao Lower Bound of Tichavsk\'y (1998). We derive
expressions for these Cram\'er-Rao Bounds and estimate them for the models
considered. Our results demonstrate a number of important features of common
population growth models, most notably their multi-modal posterior surfaces and
dependence between the static and dynamic parameters. We conclude by sampling
from the posterior distribution of each of the models, and use Bayes factors to
highlight how observation noise significantly diminishes our ability to select
among some of the models, particularly those that are designed to reproduce an
Allee effect
Experiments and a model for pilot dynamics with visual and motion inputs
Multimodality pilot model for visual and motion feedbacks derived from simulator progra
Relationship between antihypertensive medications and cognitive impairment: Part II. Review of Physiology and animal studies
Purpose of Review There is an established association between hypertension and increased risk of poor cognitive performance and dementia including Alzheimer’s disease; however, associations between antihypertensive medications (AHM) and dementia risk are less clear. An increased interest in AHM has resulted in expanding publications; however, none of the recent reviews provide comprehensive review. Our extensive review includes 24 mechanistic animal and human studies published over the last 5 years assessing relationship between AHM and cognitive function. Recent Findings All classes of AHM showed similar result patterns in animal studies. The mechanism by which AHM exert their effect was extensively studied by evaluating well-established pathways of AD disease process, including amyloid beta (Aβ), vascular, oxidative stress and inflammation pathways, but only few studies evaluated the blood pressure lowering effect on the AD disease process. Summary Methodological limitations of the studies prevent comprehensive conclusions prior to further work evaluating AHM in animals and larger human observational studies, and selecting those with promising results for future RCTs
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