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1,023 results for “Arrests”
Data for: The thermo-optical coefficient as an alternative probe for the structural arrest of polymeric glass formers
<p>The data is supplementary to the publication "The thermo-optical coefficient as an alternative probe for the structural arrest of polymeric glass formers", DOI: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.polymer.2024.126868" target="_blank" rel="noreferrer noopener">10.1016/j.polymer.2024.126868</a>, and contains processed raw data.</p> <p>Key words: Temperature-modulated optical refractometry, Solidification, Glass transition temperature, Thermo-optical coefficient, Structural arrest</p> <p>The data sets contain measured data on Temperature-modulated optical refractometry (TMOR) of a model epoxy polymer from the viscoelastic temperature range, through the glass transition to the glassy state. The data sets were collected via the temperature-jump method.</p> <p>Material details:</p> <ul> <li>Bisphenol A Diglycidyl ether (DGEBA, DER332, CAS 1675-54-3) + Difunctional and trifunctional carbocylic acids (Pripol1040, Croda) +1,5,7-triazabicyclo[4.4.0]dec-5-en (TBD, CAS 5807-14-7, 10 mol-% relative to carboxylic acid functions)</li> </ul> <p>Funding received from:</p> <ul> <li>German Research Foundation (DFG), project number: 521902629</li> </ul>
Eye tracking videos and raw data of breathing recognition attempts in simulated out-of-hospital cardiac arrest
<div> <div> <div> <p>This dataset comprises eye tracking videos and raw data documenting attempts to recognize breathing in simulated out-of-hospital cardiac arrest scenarios.</p> <p>The data were recorded using an Ergoneers Dikablis head-mounted eye tracker.</p> <p>Our analysis of this data resulted in the publication of two studies: Study 1, available at <a href="https://doi.org/10.1097/SIH.0000000000000617" target="_blank" rel="noopener">https://doi.org/10.1097/SIH.0000000000000617</a>, and Study 2, accessible at <a href="https://doi.org/10.25894/ijfae.2307" target="_blank" rel="noopener">https://doi.org/10.25894/ijfae.2307</a></p> <p> </p> <p>Version 2 is up-to-date.</p> <p>In Version 1:</p> <ul> <li>the doi for Study 2 was incorrect</li> <li>data for participant #51 of Study 1 were missing</li> </ul> </div> </div> </div>
The impact of severity of acute respiratory distress syndrome following cardiac arrest on neurologic outcomes
<p>Overall survival rates at 28 days in patients with and without ARDS. ARDS = acute respiratory distress syndrome</p>
Shasta County Arrest Disposition Data 2022
<p>This dataset was exported from the California Department of Justice's OpenJustice platform (https://openjustice.doj.ca.gov/data) on May 17, 2024, and contains arrest data for Shasta County for the year 2022. The data was reported by local law enforcement agencies as part of the Monthly Arrest and Citation Register (MACR), which tracks felony, misdemeanor, and status offense arrests.</p> <p>The dataset includes the following demographic and arrest-related variables: year, county, gender, race, arrest disposition code, age group, and various categories of offenses. It provides aggregate counts for total arrests, violent crimes, property crimes, drug offenses, sex offenses, and other felonies, as well as misdemeanor and status offense totals.</p> <p>This dataset is presented in CSV format and offers a detailed snapshot of arrests within Shasta County for 2022, broken down by key demographic and offense-related factors. </p>
Dataset related to: Add-On Cyclic Angiotensin-(1-7) with Cyclophosphamide Arrests Progressive Kidney Disease in Rats with ANCA Associated Glomerulonephritis
<p>The files contain all the dataset included in the manuscript divided by figures.</p> <p> </p> <p>Abstract: Rapidly progressive crescentic glomerulonephritis associated with anti-neutrophil cytoplasmic antibodies (ANCA-GN) is a major cause of renal failure. Current immunosuppressive therapies are associated with severe side effects, intensifying the need for new therapeutic strategies. The activation of Mas receptor/Angiotensin-(1-7) axis exerted renoprotection in chronic kidney disease.<br> Here, we investigated the effect of adding the lanthionine-stabilized cyclic form of angiotensin-1-7 [cAng-(1-7)] to cyclophosphamide in a rat model of ANCA-GN. At the onset of proteinuria,Wistar Kyoto rats with ANCA-GN received vehicle or a single bolus of cyclophosphamide, with or without daily cAng-(1-7). Treatment with cAng-(1-7) plus cyclophosphamide reduced proteinuria by 85% vs. vehicle, and by 60% vs. cyclophosphamide, and dramatically limited glomerular crescents to less than 10%. The addition of cAng-(1-7) to cyclophosphamide protected against glomerular inflammation and endothelial rarefaction and restored the normal distribution of parietal epithelial cells. Ultrastructural analysis revealed a preserved GBM, glomerular endothelium and podocyte structure, demonstrating that combination therapy provided an additional layer of renoprotection. This study demonstrates that adding cAng-(1-7) to a partially effective dose of cyclophosphamide arrests the progression of renal disease in rats with ANCA-GN, suggesting that cAng-(1-7) could be a novel clinical approach for sparing immunosuppressants.</p>
Family-Authored ICU Diaries to Reduce Fear in Patients Experiencing a Cardiac Arrest (FAID Fear)
ClinicalTrials.gov study NCT05144477. IPD Sharing: NO. Countries: 1. Publications: 9.
I-CARE: International Cardiac Arrest REsearch consortium electroencephalography database - Brain Continuity Index
Open the record for dataset details and reuse information.
Host-specificity in Scelionid parasitoids: Arrestment, competition, and egg electrophysiology results
<p>This archive contains the raw data from a series of experiments with Trissolcus basalis and Trissolcus oenone to better understand the chemical basis mediating differences in host-specificity between these parasitoids. First, we compared the searching behaviour of T. basalis and T. oenone in open arena arrestment bioassays contaminated with footprint compounds from Nezara viridula and Cuspicona simplex. Trissolcus basalis spent four times longer searching for N. viridula than C. simplex, while T. oenone spent four times longer searching for C. simplex than N. viridula. We then conducted competition experiments to assess factors important to determining the outcomes of extrinsic and intrinsic contests between these parasitoids when they are simultaneously exposed to C. simplex egg masses. Trissolcus oenone, was the superior competitor in extrinsic and intrinsic contests. Finally, we recorded the antennal responses of T. basalis to egg extracts of N. viridula to tentatively identify potential contact kairomones used by this parasitoid to recognise and accept hosts.</p>
Dataset (I.) related to publication: PIP4K2C inhibition reverses autophagic flux arrest induced by SARS-CoV-2
<p>MD simulation data (PIKfyve simulations) related to publication: </p> <p>Karim, M., Mishra, M., Lo, CW. <em>et al.</em> PIP4K2C inhibition reverses autophagic flux impairment induced by SARS-CoV-2. <em>Nat Commun</em> <strong>16</strong>, 6397 (2025). https://doi.org/10.1038/s41467-025-61759-1</p> <ul> <li>The .zip files contain raw Desmond simulation trajectories of PIKfyve in complex with RMC-113 [18 replicas; each 4 us] (-out.cms files and trajectories).</li> </ul> <p> </p>
RPE-1 iCas9 sgNT cells undergoing nocodazole-induced mitotic arrest
<p>Phasefocus LiveCyte video showing RPE-1 iCas9 sgNT cells undergoing nocodazole-induced mitotic arrest. Cells were treated with 1 μg/mL doxycycline for 96 hours to induce Cas9 expression and were imaged every 9 minutes for 48 hours at 20x magnification. From 1:11 cells start entering mitosis as indicated by their rounding up into a ball; from 9:35 mitotic cells begin to slip from mitosis as indicated by rounded mitotic cells flattening. A mitotic cell undergoes mitotic cell death at 42:35 as indicated by the presence of propidium iodide (red) in the top right corner.</p>
RPE-1 GFP-H2B iCas9 cells undergoing nocodazole-induced mitotic arrest
<p>Phasefocus LiveCyte video showing RPE-1 GFP-H2B iCas9 cells undergoing nocodazole-induced mitotic arrest. Cells were treated with 1 μg/mL doxycycline for 96 hours to induce Cas9 expression and were imaged every 9 minutes for 48 hours at 20x magnification. Mitotic cells can be seen from 0:00 as indicated by their rounding up into a ball; from 2:41 mitotic cells begin to slip from mitosis as indicated by rounded mitotic cells flattening. A dead cell can be seen from 0:00 as indicated by the presence of propidium iodide (red) and two other mitotic cells undergo mitotic cell death at 43:42 and 44:20 in the bottom left corner.</p>
RPE-1 GFP-H2B iCas9 cells undergoing paclitaxel-induced mitotic arrest
<p>Phasefocus LiveCyte video showing RPE-1 GFP-H2B iCas9 cells undergoing paclitaxel-induced mitotic arrest. Cells were treated with 1 μg/mL doxycycline for 96 hours to induce Cas9 expression and were imaged every 9 minutes for 48 hours at 20x magnification. From 3:17 cells start entering mitosis as indicated by their rounding up into a ball; from 12:44 mitotic cells begin to either slip from mitosis as indicated by rounded mitotic cells flattening or undergoing mitotic cell death as indicated by the presence of propidium iodide (red).</p>
The molecular architecture of cell cycle arrest
<p>The cellular decision governing the transition between proliferative and arrested states is crucial to the development and function of every tissue. While the molecular mechanisms that regulate the proliferative cell cycle are well established, we know comparatively little about what happens to cells as they diverge into cell cycle arrest. We combined hyperplexed, single-cell imaging with manifold learning to obtain a map of the molecular architecture that governs cell cycle exit and progression into reversible (“quiescent”) and irreversible (“senescent”) states of arrest. Using this map, we resolved multiple points of divergence from the proliferative cell cycle into distinct states of arrest and the molecular mechanisms governing these fate decisions, which we verified by single-cell, time-lapse imaging. We found that senescence is an obligate G1-like molecular state, regardless of the phase of cell cycle exit, and that cells can escape from this “irreversible” state of arrest through the upregulation of G1 – but not G2 – cyclins. This map of cell cycle arrest provides our first glimpse of the overall organization of the proliferation/arrest decision.</p>
Outcome of severe COVID-19: spotlight on fatigue, fatiguability, multidomain complaints and pattern of cognitive deficits in a case series without prior brain dysfunction and without COVID-19-related stroke and/or cardiac arrest
<p>Outcome of severe COVID-19: spotlight on fatigue, fatiguability, multidomain complaints and pattern of cognitive deficits in a case series without prior brain dysfunction and without COVID-19-related stroke and/or cardiac arrest<br> Valérie Beaud1, Sonia Crottaz-Herbette1, Vincent Dunet2, Jean-François Knebel1, Pierre-Alexandre Bart3, Stephanie Clarke1<br> 1 Service of Neuropsychology and Neurorehabilitation, Lausanne University Hospital and University of Lausanne, 1011 Lausanne, Switzerland<br> 2 Service of Diagnostic and Interventional Radiology, Lausanne University Hospital and University of Lausanne, 1011 Lausanne, Switzerland<br> 3 Service of Internal Medicine, Lausanne University Hospital and University of Lausanne, 1011 Lausanne, Switzerland<br> ABSTRACT<br> Background: Cognitive deficits were often reported during the acute and post-acute stages of severe COVID-19 and were often, but not always, associated with signs of brain damage. Population-wide surveys highlighted the need for investigations into the nature, the severity and the evolution of cognitive, behavioural and psychiatric deficits.<br> Case presentation: We report the outcome at 12 months after severe COVID-19 involving intensive care unit stay and mechanical ventilation in six patients. None of the patients had history of prior brain dysfunction and none sustained stroke and/or cardiac arrest during COVID-19. A pervading mental and physical fatigue was consistently reported as well as numerous multidomain complaints, which affect to some extend everyday life, and for some of the patients a mental fatiguability, a certain degree of neurobehavioural (apathy) and/or psychiatric (anxiety) dysfunction. Standardized neuropsychological tests revealed for 4 of the 6 patients the occurrence relatively isolated of cognitive dysfunction or performance at the lower limit of the norm in some, but not all attentional, executive and/or working memory tests. Somatic scales highlighted the presence of dyspnoea, muscle weakness, olfactory disorder and/or minor sleep problems in some but not all patients.<br> Conclusion: Fatigue, fatiguability, multidomain complaints, which affect to some extend everyday life, cognitive dysfunction or performance at the lower limit of the norm and a certain degree of neurobehavioural and/or psychiatric and/or somatic dysfunction can occur in the aftermath of severe COVID-19 even in the absence of neurological antecedents or of COVID-19-related stroke and/or cardiac arrest.</p>
Data from: Neuroprotection provided by hypothermia initiated with high transnasal flow with ambient air in a model of pediatric cardiac arrest
<p>Clinical trials of hypothermia after pediatric cardiac arrest have not seen robust improvement in functional outcome, possibly because of the long delay in achieving target temperature. Previous work in infant piglets showed that high nasal airflow, which induces evaporative cooling in the nasal mucosa, reduced regional brain temperature uniformly in half the time needed to reduce body temperature. The mouth is kept open to allow the high nasal airflow to easily exit. Here, we evaluated whether initiation of hypothermia with high transnasal airflow (32 L/min) provides neuroprotection without adverse effects in the setting of asphyxic cardiac arrest. Anesthetized, mechanically ventilated piglets (approximately 2-weeks-old) underwent sham-operated procedures (Group 1) or asphyxic cardiac arrest (Groups 2-6). The asphyxic insult consisted of reducing the inspired oxygen from 30% to 9.5-10% for 45 minutes (hypoxia period), then briefly increasing the inspired oxygen to 21% for 5 min (to improve the later success of cardiac resuscitation), and then completely stopping ventilation for 7 minutes. Cardiopulmonary resuscitation (CPR) commenced by re-establishing ventilation, performing chest compression, and injecting epinephrine as needed. The five cardiac arrest groups were further divided into those with normothermic recovery (38.5°C; Group 2), with mild hypothermia (34°C) initiated by surface cooling at 10 minutes (Group 3) or 120 minutes (Group 5) after resuscitation, or with mild hypothermia (34°C) initiated by transnasal cooling initiated at 10 minutes (Group 4) or 120 minutes (Group 6) after resuscitation. In the two transnasal cooling groups, the high nasal airflow continued for 2 hours and was then stopped; thereafter, surface cooling was used to maintain hypothermia. In all four groups with induced hypothermia, rectal temperature was sustained at the targeted temperature of 34°C with surface cooling until 20 hours after resuscitation, followed by 6 hours of gradual rewarming and cessation of fentanyl/70% nitrous oxide anesthesia.<strong> </strong>At four days of recovery, the piglets were euthanized and their brains were analyzed for the density of morphologically intact neurons in putamen, sensorimotor cortex, ventrolateral thalamus, and prefrontal cortex. The data sheet shows the density of viable neurons in these 4 brain regions for the 45 piglets that completed the study. The data sheet also shows the serial measurements of rectal temperature, mean arterial blood pressure, heart rate, and arterial blood measurements of the partial pressure of oxygen (PO2) and carbon dioxide (PCO2), oxyhemoglobin saturation, and pH obtained at baseline, during the period of hypoxia, at 4 minutes of ventilation with 21% O2, during the period of asphyxia, and during the first 24 hours of recovery. The piglets are assigned the same unique identifier number, labelled 1-45, for each set of measurements. Transnasal cooling initiated at 10 minutes after resuscitation was able to significantly rescue neurons in the highly vulnerable putamen without adverse effects.</p>
Radial Hydraulic Fracturing Experiment: 1 Cycle of Fracture Propagation, Arrest, and Closure in Molasse de Villarlod Sandstone - Sample M03
<h4><strong>Overview</strong></h4> <p>This dataset encompasses detailed measurements from a lab-scale radial hydraulic fracturing experiment conducted on a cubic sample of Molasse de Villarlod sandstone, designated as Sample M03. The sandstone, sourced from a quarry in Fribourg, Switzerland, is known for its porosity (18.1%) and permeability, making it an ideal material for studying hydraulic fracture processes. The primary focus of the experiment was to observe and analyze the propagation, arrest, and closure of hydraulic fractures under controlled triaxial stress conditions.</p> <h4><strong>Experimental Setup</strong></h4> <p>The experiment was conducted on a cubic sandstone sample with dimensions of 25 × 25 × 25 cm. The sample was placed in a truetriaxial frame that applied confining stresses in all three principal directions:</p> <ul> <li><strong>Vertical Confining Stress:</strong> 7 MPa</li> <li><strong>Horizontal Confining Stress:</strong> 14 MPa</li> </ul> <p>A <strong>viscous glucose fluid containing a UV additive</strong> was used as the fracturing fluid. This fluid was injected through a 1/8'' high-pressure tube cemented with epoxy into a centrally drilled hole within the sample. An axisymmetric notch was created at the injection point to facilitate fracture initiation and promote the planarity of the fracture.</p> <p>The experiment was designed to simulate one cycle of fracture initiation, propagation, arrest, and closure. The closure of the fracture was occured by the leakoff of the fracturing fluid into the surrounding porous medium.</p> <h4><strong>Acoustic Monitoring</strong></h4> <p>To capture the dynamics of fracture propagation and closure, the experiment employed both passive and active acoustic monitoring systems:</p> <ol> <li> <p><strong>Passive Acoustic Monitoring:</strong></p> <ul> <li><strong>Sensors:</strong> 16 Vallen VS150-M passive piezoelectric sensors were used to capture Acoustic Emissions (AEs) within the frequency range of 50 kHz to 600 kHz.</li> <li><strong>Signal Processing:</strong> Continuous signal analysis and denoising were performed on the captured AE data. The STA/LTA algorithm was applied to the denoised signal to identify potential p-wave arrivals, providing insights into the fracture mechanics.</li> </ul> </li> <li> <p><strong>Active Acoustic Monitoring:</strong></p> <ul> <li><strong>Transducers:</strong> A total of 64 piezoelectric transducers were integrated into the loading platens, with 32 acting as sources and 32 as receivers. The array included 10 shear-wave and 54 longitudinal-wave transducers.</li> <li><strong>Signal Generation and Acquisition:</strong> A Ricker excitation signal with a central frequency adjustable between 300 and 750 kHz was generated and amplified using a high-power amplifier. The signal was routed to one of the 32 source transducers via a multiplexer, and the resulting signals were recorded simultaneously by the 32 receiver transducers at a sampling frequency of 50 MHz. Each source was excited 50 times to improve the signal-to-noise ratio, with the complete acquisition sequence taking approximately 2.5 seconds.</li> </ul> </li> </ol> <h4><strong>Additional Measurements</strong></h4> <p>In addition to acoustic monitoring, several other key measurements were recorded during the experiment:</p> <ul> <li><strong>Fluid Injection Parameters:</strong> The pressure and rate of fluid injection were continuously monitored.</li> <li><strong>Flat-Jack and Piston Parameters:</strong> The pressures and volumes exerted by each pair of flat-jacks were recorded at a frequency of 1 Hz.</li> <li><strong>Fracture Opening Measurement:</strong> An eddy current sensor, an electromagnetic inductive device, was placed inside the wellbore at the notch/inlet to directly measure the fracture opening.</li> </ul> <p>All measurements were synchronized using a dedicated LabView application to ensure consistency across the dataset.</p> <h4><strong>Conclusion</strong></h4> <p>This dataset provides a comprehensive view of the hydraulic fracturing behavior of Molasse de Villarlod sandstone under controlled laboratory conditions, with a focus on the processes of fracture propagation, arrest, and closure. The dataset includes raw and processed acoustic data, fluid injection metrics, and direct observations of fracture opening. It is an invaluable resource for researchers and engineers studying hydraulic fracturing, rock mechanics, and related fields. The data is suitable for detailed analysis and modeling of fracture mechanics in porous, permeable sandstones.</p> <h4><strong>Note</strong></h4> <p>Since the fracture did not extend to the boundaries of the sample, the sample was subsequently cut, and a core was extracted. This core was then sent for CT-scan analysis, which was used to reconstruct the residual fracture surfaces and assess their roughness. The dataset from this analysis is available in the Related Work section via the provided URL (Talebkeikhah, M. (2024). CT-Scan Image Dataset of Residual Fluid-Driven Fracture in a Molasse de Villarlod Sandstone Core - Post-Radial Hydraulic Fracture Experiment - M03 Sample [Data set]. Zenodo. <a href="https://doi.org/10.5281/zenodo.13358916" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.13358916</a>).</p> <h4><strong>Processing code</strong></h4> <p>Follow the <strong>URL repositories</strong> below to access to the codes for processing these dataset.</p> <p><a href="https://github.com/GeoEnergyLab-EPFL/ActiveAcoustiX">https://github.com/GeoEnergyLab-EPFL/ActiveAcoustiX</a></p> <p><a href="https://github.com/GeoEnergyLab-EPFL/FracLowRate">https://github.com/GeoEnergyLab-EPFL/FracLowRate</a></p> <p><strong>Contact and Support</strong></p> <p>Email:</p> <p>Brice Lecampion: brice.lecampion@epfl.ch</p> <p>Mohsen Talebkeikhah: m.talebkeikhah@gmail.com</p>
Arresting the spread of invasive species in continental systems
<p>Invasive species are a primary threat to biodiversity and are challenging to manage once populations become established. But removing them is further complicated when invasions occur in continental, mixed-ownership systems. We demonstrate a rare conservation success: the regional-scale removal of an invasive predator – the barred owl (<i>Strix varia</i>) – to benefit the spotted owl (<i>S. occidentalis</i>) in California, USA. Barred owl site occupancy declined six-fold from 0.19 to 0.03 following one year of removals, and site extinction (0.92) far exceeded colonization (0.02). Spotted owls recolonized 56% of formerly occupied territories within one year, contrasting starkly with removals conducted after barred owls achieved high densities in the Pacific Northwest. Thus, our study averted the otherwise likely extirpation of California spotted owls by barred owl competition. Collectively, leveraging technological advances in population monitoring, early intervention, targeting defensible biogeographic areas, and fostering public-private partnerships will reduce invasive species-driven extinction of native fauna in continental systems.</p>
Olfactory event-related potentials in a functionally anosmic patient with arrested hydrocephalus
<p>Hydrocephalus is one of the lesser known causes of central olfactory loss. The pathogenesis of hydrocephalus involves the olfactory bulbs or tracts, and more rarely, other frontotemporal cortical regions. We describe a case of olfactory dysfunction in a macrocephalic 63-year-old female patient with arrested hydrocephalus. Her olfactory function was assessed by using the Sniffin' Sticks test, olfactory event-related potentials (OERPs), and 3-Tesla magnetic resonance imaging (MRI). An OERP examination suggested partial impairment of the central olfactory pathways and central parietal regions where OERP amplitude is maximal. Indeed, we found an evident olfactory potential trace with an increased latency only on Pz derivation. However, structural MRI showed important cortical brain thinning and large expansion of the third ventricle, with evident damage of the olfactory frontotemporal areas. The Sniffin' Sticks test and MRI supported the diagnosis of anosmia, while OERP findings indicated partial preservation of olfactory function, likely due to an adaptation of the central olfactory system. These findings highlight the importance of a multi-integrated approach to detect olfactory impairment.</p>
Radial Hydraulic Fracturing Experiment: 3 Cycles of Fracture Propagation, Arrest, and Closure in Molasse de Villarlod Sandstone - Sample M04
<h4><strong>Overview</strong></h4> <p>This dataset encompasses detailed measurements from a lab-scale radial hydraulic fracturing experiment conducted on a cubic sample of Molasse de Villarlod sandstone, designated as Sample M04. The sandstone, sourced from a quarry in Fribourg, Switzerland, is known for its porosity (18.1%) and permeability, making it an ideal material for studying hydraulic fracture processes. The primary focus of the experiment was to observe and analyze the propagation, arrest, and closure of hydraulic fractures under controlled triaxial stress conditions.</p> <h4><strong>Experimental Setup</strong></h4> <p>The experiment was conducted on a cubic sandstone sample with dimensions of 25 × 25 × 25 cm. The sample was placed in a truetriaxial frame that applied confining stresses in all three principal directions:</p> <ul> <li><strong>Vertical Confining Stress:</strong> 5 MPa</li> <li><strong>Horizontal Confining Stress:</strong> 15 MPa</li> </ul> <p>A <strong>viscous glycerol fluid (0.57 Pa.s) containing a UV additive</strong> was used as the fracturing fluid. This fluid was injected through a 1/8'' high-pressure tube cemented with epoxy into a centrally drilled hole within the sample. An axisymmetric notch was created at the injection point to facilitate fracture initiation and promote the planarity of the fracture.</p> <p>The experiment was designed to simulate three cycles of fracture initiation, propagation, arrest, and closure. The closure of the fracture was occured by the leakoff of the fracturing fluid into the surrounding porous medium.</p> <h4><strong>Acoustic Monitoring</strong></h4> <p>To capture the dynamics of fracture propagation and closure, the experiment employed both passive and active acoustic monitoring systems:</p> <ol> <li> <p><strong>Passive Acoustic Monitoring:</strong></p> <ul> <li><strong>Sensors:</strong> 16 Vallen VS150-M passive piezoelectric sensors were used to capture Acoustic Emissions (AEs) within the frequency range of 50 kHz to 600 kHz.</li> <li><strong>Signal Processing:</strong> Continuous signal analysis and denoising were performed on the captured AE data. The STA/LTA algorithm was applied to the denoised signal to identify potential p-wave arrivals, providing insights into the fracture mechanics.</li> </ul> </li> <li> <p><strong>Active Acoustic Monitoring:</strong></p> <ul> <li><strong>Transducers:</strong> A total of 64 piezoelectric transducers were integrated into the loading platens, with 32 acting as sources and 32 as receivers. The array included 10 shear-wave and 54 longitudinal-wave transducers.</li> <li><strong>Signal Generation and Acquisition:</strong> A Ricker excitation signal with a central frequency adjustable between 300 and 750 kHz was generated and amplified using a high-power amplifier. The signal was routed to one of the 32 source transducers via a multiplexer, and the resulting signals were recorded simultaneously by the 32 receiver transducers at a sampling frequency of 50 MHz. Each source was excited 50 times to improve the signal-to-noise ratio, with the complete acquisition sequence taking approximately 2.5 seconds.</li> </ul> </li> </ol> <h4><strong>Additional Measurements</strong></h4> <p>In addition to acoustic monitoring, several other key measurements were recorded during the experiment:</p> <ul> <li><strong>Fluid Injection Parameters:</strong> The pressure and rate of fluid injection were continuously monitored.</li> <li><strong>Flat-Jack and Piston Parameters:</strong> The pressures and volumes exerted by each pair of flat-jacks were recorded at a frequency of 1 Hz.</li> <li><strong>Fracture Opening Measurement:</strong> An eddy current sensor, an electromagnetic inductive device, was placed inside the wellbore at the notch/inlet to directly measure the fracture opening.</li> </ul> <p>All measurements were synchronized using a dedicated LabView application to ensure consistency across the dataset.</p> <h4><strong>Conclusion</strong></h4> <p>This dataset provides a comprehensive view of the hydraulic fracturing behavior of Molasse de Villarlod sandstone under controlled laboratory conditions, with a focus on the processes of fracture propagation, arrest, and closure. The dataset includes raw and processed acoustic data, fluid injection metrics, and direct observations of fracture opening. It is an invaluable resource for researchers and engineers studying hydraulic fracturing, rock mechanics, and related fields. The data is suitable for detailed analysis and modeling of fracture mechanics in porous, permeable sandstones.</p> <h4><strong>Note</strong></h4> <p>Since the fracture did not extend to the boundaries of the sample, the sample was subsequently cut, and a core was extracted. This core was then sent for CT-scan analysis, which was used to reconstruct the residual fracture surfaces and assess their roughness. The dataset from this analysis is available in the Related Work section via the provided URL (Talebkeikhah, M. (2024). CT-Scan Image Dataset of Residual Fluid-Driven Fracture in a Molasse de Villarlod Sandstone Core - Post-Radial Hydraulic Fracture Experiment - M04 Sample [Data set]. Zenodo. <a href="https://doi.org/10.5281/zenodo.13357511" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.13357511</a>).</p> <h4><strong>Processing code</strong></h4> <p>Follow the <strong>URL repositories</strong> below to access to the codes for processing these dataset.</p> <p><a href="https://github.com/GeoEnergyLab-EPFL/ActiveAcoustiX">https://github.com/GeoEnergyLab-EPFL/ActiveAcoustiX</a></p> <p><a href="https://github.com/GeoEnergyLab-EPFL/FracLowRate">https://github.com/GeoEnergyLab-EPFL/FracLowRate</a></p> <p><strong>Contact and Support</strong></p> <p>Email:</p> <p>Brice Lecampion: brice.lecampion@epfl.ch</p> <p>Mohsen Talebkeikhah: m.talebkeikhah@gmail.com</p>
A Study on the Impact of a New Canton-Wide First Responder System in Zug, Switzerland, on Survival After Adult Cardiac Arrest-Examining Early Life-Saving Organized Help, Fast Defibrillation, and Impro
ClinicalTrials.gov study NCT07323667. IPD Sharing: NO. Countries: 1. Publications: 10.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.