282 research outputs found
A TLE-based Algorithm for Correcting Empirical Model Densities during Geomagnetic Storms
Neutral densities increase up to 800% during geomagnetic storms. Satellite two-line element sets (TLEs) show increased orbital decay during geomagnetic storms from increased drag
Detection in LA-ICPMS: construction and performance evaluation of decision rules
Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) is frequently employed for the analysis of minute isotope contents in the presence of a background noise. Distinguishing between the sample signal and the background noise at a given confidence level thus represents a routine challenge. For count numbers Nb and Ns collected during (equally long) background and sample measurements, respectively, the statistical significance of their net value, Ns, Nb, can be evaluated: how probable is it to obtain such value by subtracting two count number estimates coming from a common statistical distribution (i.e., when Ns and Nb represent measured estimates of the same mean activity)? If, based on the analysis of a model distribution of the net count numbers, we decide that this is probable, the signal is statistically indistinguishable from the background: the analysed isotope is not detected. If the corresponding (one-sided) probability is below some threshold, it is detected. The net signal value on the divide between the above alternatives, given in net counts or mass (content) units, is called critical level; optionally, it can be complemented by the computation of the detection limit; such values are often reported in the literature. Less discussed is the appropriateness of computational methods used to estimate these values. Troubles arise from attempts to apply Gaussian confidence intervals to small, discretely distributed count numbers contained in real LA-ICPMS acquisitions, and from a non-optimal estimation of the net count number standard deviation in some of the methods used for the computation of critical levels for paired measurements. Combined, these factors may result in uncontrolled, excessively high rates of false detections (background reported as detection of analyte in the sample). Here, we provide a review of methods, otherwise called decision rules, available for the critical level estimation and discuss how to evaluate the performances of these rules to enable an educated computation of LA-ICPMS detection capabilities, including the case of small count numbers
Thermal model of successive dike injections and implications for the development of intraplate volcanoes
Temperatures in the root zones of volcanoes play a critical role in the development and persistence of
shallow-level magmatic reservoirs in the crust. Here, we present a 1D thermal model allowing evaluation of
the thermal impact of magma travelling in conduits to the surface on the root zone of a volcano. This thermal
model has been developed to better understand the formation of a vertical intrusion located in the root zone of
a dismembered Miocene volcano on Fuerteventura, Canary Archipelago. This intrusion, named PX1, constitutes
an almost pure amalgamation of dikes of either clinopyroxenitic or gabbroic composition. Both types
of dikes display cumulate textures and are interpreted as resulting from the protracted crystallization of a
mafic magma. The formation of clinopyroxenitic, in contrast to gabbroic dikes, requires that the residual
melt was extracted at high temperature (N1050°) to avoid plagioclase crystallization.
Simulations of multiple dike injections show that the temperature in the root zone increases significantly with
the addition of dikes, but the maximum temperature reached in the system depends on the duration of
magma flow in the conduits and the time interval between dike injections (i.e., repose period). Active flow is
the critical parameter that distinguishes instantaneous dike injection from a magmatic conduit. Without significant
magma flow (N1 month), high-temperature conditions (N1000 °C) cannot be maintained in the pluton unless
dikes are very thick and the repose period is extremely small. On the other hand,magma flow times of one to
several months, combined with short time intervals between dike injections (b25 years), which are conditions
comparable to those recorded for historical eruptions of oceanic island volcanoes, allowthe production and preservation
of temperatures above the plagioclase liquidus for significant durations, as required to generate
clinopyroxenitic dikes such as those observed in the PX1 pluton.
Persistent high temperature in the vicinity of magma conduits limits the differentiation of melts in transit to the
surface, providing a potential explanation forwhy lavas ofmafic to intermediate composition predominate in intraplate
volcanoes such as Fuerteventura or Fogo Island (Cape Verde Archipelago). In extreme cases, when temperatures
over 1000–1050 °C in the central part of the feeding zone are maintained for years, the remaining
magma in the conduit does not solidify but is preserved in a mushy state. New pulses of magma would not be
able to cross this zone butwould rather amalgamate in the incipientmagma reservoir. The present model differs
from previous models of sill intrusion in that magmas do not need to pond at depth to create a reservoir but
merely supply heat while travelling to the surface. Depending on the time interval between dike injections
and the duration ofmagma flow through the crust, magma rising in vertical conduits could directly feed the volcanic
edifice or could lead to the formation of magma reservoirs. This process may explain why some volcanoes
erupt mafic or differentiated magmas during distinct periods of activity
Ground state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2
High-resolution ac susceptibility and thermal conductivity measurement on
Cu2Te2O5X2(X=Br,Cl) single crystals are reported. For Br-sample, sample
dependence prevents to distinguish between possibilities of magnetically
ordered and spin-singlet ground states. In Cl-sample a three-dimensional
transition at 18.5 K is accompanied by almost isotropic behavior of
susceptibility and almost switching behavior of thermal conductivity. Thermal
conductivity studies suggest the presence of a tremendous spin-lattice coupling
characterizing Cl- but not Br-sample. Below the transition Cl-sample is in a
complex magnetic state involving AF order but also the elements consistent with
the presence of a gap in the excitation spectrum.Comment: version accepted for publication in Phys.Rev.B-Rapid Communicatio
Graphene oxide nanosheets modulate spinal glutamatergic transmission and modify locomotor behaviour in an in vivo zebrafish model
Graphene oxide (GO), an oxidised form of graphene, is widely used for biomedical applications, due to its dispersibility in water and simple surface chemistry tunability. In particular, small (less than 500 nm in lateral dimension) and thin (1-3 carbon monolayers) graphene oxide nanosheets (s-GO) have been shown to selectively inhibit glutamatergic transmission in neuronal cultures in vitro and in brain explants obtained from animals injected with the nanomaterial. This raises the exciting prospect that s-GO can be developed as a platform for novel nervous system therapeutics. It has not yet been investigated whether the interference of the nanomaterial with neurotransmission may have a downstream outcome in modulation of behaviour depending specifically on the activation of those synapses. To address this problem we use early stage zebrafish as an in vivo model to study the impact of s-GO on nervous system function. Microinjection of s-GO into the embryonic zebrafish spinal cord selectively reduces the excitatory synaptic transmission of the spinal network, monitored in vivo through patch clamp recordings, without affecting spinal cell survival. This effect is accompanied by a perturbation in the swimming activity of larvae, which is the locomotor behaviour generated by the neuronal network of the spinal cord. Such results indicate that the impact of s-GO on glutamate based neuronal transmission is preserved in vivo and can induce changes in animal behaviour. These findings pave the way for use of s-GO as a modulator of nervous system function
Shape-sensing robotic-assisted bronchoscopy for pulmonary nodules: initial multicenter experience using the Ion™ Endoluminal System
BACKGROUND: Traditional bronchoscopy provides limited approach to peripheral nodules. Shape-sensing robotic-assisted bronchoscopy (SSRAB, Ion™ Endoluminal System) is a new tool for minimally invasive peripheral nodule biopsy. We sought to answer the research question: Does SSRAB facilitate sampling of pulmonary nodules during bronchoscopists\u27 initial experience?
METHODS: The lead-in stage of a multicenter, single-arm, prospective evaluation of the Ion Endoluminal System (PRECIsE) is described. Enrolled subjects ≥ 18 years old had recent computed tomography evidence of one or more solid or semi-solid pulmonary nodules ≥ 1.0 to ≤ 3.5 cm in greatest dimension and in any part of the lung. Subjects were followed at 10- and 30-days post-procedure. This stage provided investigators and staff their first human experience with the SSRAB system; safety and procedure outcomes were analyzed descriptively. Neither diagnostic yield nor sensitivity for malignancy were assessed in this stage. Categorical variables are summarized by percentage; continuous variables are summarized by median/interquartile range (IQR).
RESULTS: Sixty subjects were enrolled across 6 hospitals; 67 nodules were targeted for biopsy. Median axial, coronal and sagittal diameters were \u3c 18 mm with a largest cardinal diameter of 20.0 mm. Most nodules were extraluminal and distance from the outer edge of the nodule to the pleura or nearest fissure was 4.0 mm (IQR: 0.0, 15.0). Median bronchial generation count to the target location was 7.0 (IQR: 6.0, 8.0). Procedure duration (catheter-in to catheter-out) was 66.5 min (IQR: 50.0, 85.5). Distance from the catheter tip to the closest edge of the virtual nodule was 7.0 mm (IQR: 2.0, 12.0). Biopsy completion was 97.0%. No pneumothorax or airway bleeding of any grade was reported.
CONCLUSIONS: Bronchoscopists leveraged the Ion SSRAB\u27s functionality to drive the catheter safely in close proximity of the virtual target and to obtain biopsies. This initial, multicenter experience is encouraging, suggesting that SSRAB may play a role in the management of pulmonary nodules. Clinical Trial Registration identifier and date NCT03893539; 28/03/2019
Acute and Chronic Impact of Dynamic Exercise on Arterial Stiffness in Older Hypertensives
Arterial stiffness increases with ageing and hypertension. Regular physical activity has been recommended as an important management component of hypertension. The purpose of this study was to examine the acute impact of maximal dynamic exercise and the effect of 20 weeks of aerobic exercise on arterial stiffness of the carotid and brachial arteries in older hypertensives. Nine previously sedentary and treated older hypertensives (2 men and 7 women, age 68.2 ± 5.4 yrs) performed maximal treadmill exercise to volitional fatigue while arterial stiffness indices (arterial distensibility and β stiffness index) were measured prior to, immediately (about 10 min) following, and 24 h following maximal exercise. These measurements were repeated following 20 weeks of moderate intensity aerobic exercise training. Maximal exercise had no impact on arterial stiffness indices immediately and 24 h following exercise intervention. Following 20 weeks of training, arterial stiffness indices remained unchanged at rest and following maximal exercise. These data show that, in older hypertensives, 1) acute maximal dynamic exercise had no impact on arterial stiffness of the carotid and brachial arteries, and 2) 20 weeks of moderate intensity aerobic exercise training failed to modify arterial stiffness
The Spin Structure of the Nucleon
We present an overview of recent experimental and theoretical advances in our
understanding of the spin structure of protons and neutrons.Comment: 84 pages, 29 figure
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Assessing the quality of models of the ambient solar wind
In this paper we present an assessment of the status of models of the global Solar Wind in the inner heliosphere. We limit our discussion to the class of models designed to provide solar wind forecasts, excluding those designed for the purpose of testing physical processes in idealized configurations. In addition, we limit our discussion to modeling of the ‘ambient’ wind in the absence of coronal mass ejections. In this assessment we cover use of the models both in forecast mode and as tools for scientific research. We present a brief history of the development of these models, discussing the range of physical approximations in use. We discuss the limitations of the data inputs available to these models and its impact on their quality. We also discuss current model development trends
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