Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
3,295
datasets available to search
ShareScore release 0.7.1
Dataset results
3,295 results for “Fracture”
FIGURE 3. Unispinosus eopacificus n. gen., n in Two new species of paratanaoid tanaidaceans of the family incertae sedis (Crustacea: Peracarida) from polymetallic nodule fields in the eastern Clarion-Clipperton Fracture Zone
FIGURE 3. Unispinosus eopacificus n. gen., n. sp. Left chelipeds of (A) holotype female and (B) allotype male. Scale bar: 100 µm.
FIGURE 1. Unispinosus eopacificus n. gen., n in Two new species of paratanaoid tanaidaceans of the family incertae sedis (Crustacea: Peracarida) from polymetallic nodule fields in the eastern Clarion-Clipperton Fracture Zone
FIGURE 1. Unispinosus eopacificus n. gen., n. sp. OMS exploratory area, Clarion-Clipperton Fracture Zone. Non-ovigerous female holotype (ZRC 2020.0155): (A) habitus, lateral view. Male allotype (ZRC 2020.0156): habitus, (B) lateral and (C) dorsal views. Scale bar: 0.5 mm.
FIGURE 7. Portaratrum birdi n in Two new species of paratanaoid tanaidaceans of the family incertae sedis (Crustacea: Peracarida) from polymetallic nodule fields in the eastern Clarion-Clipperton Fracture Zone
FIGURE 7. Portaratrum birdi n. sp. Holotype female. Labrum, (A) dorsal and (A`) lateral views; (B) left and (B`) right mandibles; (C) labium; (D) maxillule; (E) maxilla; (F) maxillipeds. Scale bar: 100 µm.
FIGURE 8. Portaratrum birdi n in Two new species of paratanaoid tanaidaceans of the family incertae sedis (Crustacea: Peracarida) from polymetallic nodule fields in the eastern Clarion-Clipperton Fracture Zone
FIGURE 8. Portaratrum birdi n. sp. Holotype female. (A) Left cheliped, with setae and microtrichia on inner margin (denoted by asterisks *); (B–G) pereopods 1–6. Scale bars: 100 µm.
Data from: Friction of Longmaxi shale gouges and implications for seismicity during hydraulic fracturing
<p>Longmaxi formation shales are the major target reservoir for shale gas extraction in the Sichuan Basin, southwest China. Swarms of earthquakes accompanying hydraulic fracturing are observed at depths typified by the Longmaxi formation. Mineral composition varies broadly through the stratigraphic section due to different depositional environments. The section is generally tectosilicate-poor and phyllosilicate-rich with a minor portion (~5 <i>wt</i>.%) the converse. We measure the frictional and stability properties of shale gouges taken from the full stratigraphic section at hydrothermal conditions. Velocity-stepping experiments were performed on representative shale gouges at <i>σ<sub>c</sub></i> = 60 <i>MPa</i>, <i>P<sub>f</sub></i> = 30 <i>MPa</i> and <i>T</i> =150 <i>℃</i>. Results show that the gouges are generally frictionally strong with friction coefficients spanning a range of 0.50-0.75. Two phyllosilicate+TOC-poor gouges exhibited higher frictional strength and velocity weakening behavior, capable of potentially unstable fault slips, while only velocity strengthening behavior was observed for the remaining phyllosilicate+TOC-rich gouges. These results confirm that the frictional and stability properties are mainly controlled by phyllosilicate+TOC content. Elevating the temperature further weakens the gouges and drives it towards velocity weakening. The presence of observed seismicity in majority velocity strengthening materials suggest the importance of the minority velocity weakening materials. We suggest a model where seismicity is triggered when high pore fluid pressures drive aseismic slip in the near-field and triggers seismic slip on adjacent faults. Our results have important implications in understanding the physics of earthquakes in Sichuan Basin and highlights the importance of identifying the location and characteristics of faults prior to hydraulic fracturing.</p>
Investigation of Dynamic Fracture of Elastomers - IIa
<p>These set of experiments are the continuation of the investigation of dynamic fracture of Poly-Urethane elastomer; the details of which can be found <a href="https://doi.org/10.5281/zenodo.4034638">here</a>. Currently, a different geometry has been investigated to study the effect of geometry on the crack speeds when inertial effects cannot be neglected.</p> <p>The data consists of images from a High Resolution (HR) camera and a High Speed (HS) camera. The test protocol is similar to the one from the above link and the specimen is 200 mm long, 20 mm tall and 3 mm thick. The name of the folder corresponds to the stretch level of the specimen before the introduction of a crack.</p>
Fragility fractures and bone mineral density in male patients affected by type 1 and type 2 myotonic dystrophy
<p>Abstract</p> <p>Myotonic dystrophy is a multisystemic disorder affecting skeletal muscle. Male patients have an increased risk of fractures and develop a number of endocrine/metabolic impairments known to adversely affect bone health. The aim of this study was primarily to determine the occurrence of fragility fractures and the bone mineralization status (lumbar spine, hip and total body by dual X-ray absorptiometry) in 36 male patients affected with type 1 myotonic dystrophy and 13 male patients affected with type 2 myotonic dystrophy. Fragility fractures occurred in 15 type 1 and 7 type 2 myotonic dystrophy in non-classical osteoporotic sites, such as metatarses. Hip osteopenia was the most frequent finding, particularly in type 2 (n = 6) than type 1 myotonic dystrophy patients (n = 1), while osteoporosis was rare. Patients with type 1 myotonic dystrophy presented higher total body bone mass density than patients with type 2 myotonic dystrophy and healthy controls and lumbar spine was associated positively with the severity of the disease. Gonadic failure, with low testosterone and reduced INSL3 levels, visceral adiposity and insulin resistance correlated with reduced body mass index in both type 1 and type 2 myotonic dystrophic patients. The independent determinant of fragility fractures were low total body mass index, low blood testosterone and low global muscle mass.</p>
BONE STRAIN INDEX AS A PREDICTOR OF FURTHER VERTEBRAL FRACTURE IN OSTEOPOROTIC WOMEN
<p>Background: Osteoporosis is an asymptomatic disease of high prevalence and incidence, leading to bone fractures burdened by high mortality and disability, mainly when several subsequent fractures occur. A fragility fracture predictive model, Artificial Intelligence-based, to identify dual X-ray absorptiometry (DXA) variables able to characterise those patients who are prone to further fractures called Bone Strain Index, was evaluated in this study.</p> <p>Methods: In a prospective, longitudinal, multicentric study 172 female outpatients with at least one vertebral fracture at the first observation were enrolled. They performed a spine X-ray to calculate spine deformity index (SDI) and a lumbar and femoral DXA scan to assess bone mineral density (BMD) and bone strain index (BSI) at baseline and after a follow-up period of 3 years in average. At the end of the follow-up, 93 women developed a further vertebral fracture. The further vertebral fracture was considered as one unit increase of SDI. We assessed the predictive capacity of supervised Artificial Neural Networks (ANNs) to distinguish women consistently with a further fracture from those without a further fracture and to identify the variables expressing the maximal amount of relevant information to discriminate the two groups. ANNs were allowed to choose relevant input data automatically (TWIST-system). Moreover, we constructed a semantic connectivity map with Auto Contractive Map to offer some insight regarding the complex biological connections among the studied variables and the two conditions (further fracture vs no further fracture).</p> <p>Results: TWIST system selected 5 out of 13 available variables: age, menopause age, BMI, FTot BMC, FTot BSI. With training testing procedure, ANNs reached predictive accuracy of 79.36%, with a sensitivity of 75% and a specificity of 83.72%. The semantic connectivity map highlighted the role of BSI in predicting the risk of a further fracture.</p> <p>Conclusions: Artificial Intelligence is a useful method to analyse a complex system like that regarding osteoporosis, able to identify patients prone to a further fragility fracture. BSI appears to be a useful DXA index in identifying those patients who are at risk of further vertebral fractures.</p>
Imaging elastodynamic and hydraulic properties of in-situ fractured rock: An experimental investigation exploring effects of dynamic stressing and shearing
<p>We describe laboratory experiments to elucidate the relationship between nonlinear elasticity and permeability evolution in fractured media subjected to local stress perturbations. This study is part of an effort to image fluid pathways and fracture properties using active-source acoustic monitoring during fluid injection and shear of rough fractures. Experiments were conducted with L-shaped samples of Westerly granite fractured in-situ under tri-axial conditions with deionized water subsequently circulated through the resulting fractures. After in-situ fracturing, we separately imposed oscillations of the applied normal stress and pore pressure with amplitudes ranging from 0.2 to 1 MPa and frequencies from 0.1 to 40 Hz. During these dynamic perturbations an array of piezoelectric transducers continuously transmitted ultrasonic pulses across the fracture to monitor the evolving elastic response. We interpret the resulting evolution of elastic wave properties in the context of elastic nonlinearity and relate the estimated nonlinearity parameters to the relative change in permeability of the fractured media. Fracture roughness is then altered in-situ by shearing, with the generation of breccia and wear products. We document the evolution of permeability and fracture contact stiffness as a function of dynamic stressing and shear offset and discuss our findings in relation to fractures in Earth's crust.</p>
Data from: Oral bisphosphonates are associated with increased risk of atypical femoral fractures in elderly women
Objectives: To evaluate the association between bisphosphonate use and the risk of atypical femoral fractures among women aged 65 or older. Design: Nested case–control study. Setting: General practice research database in Spain. Exposures Use of oral bisphosphonates before the occurrence of atypical fractures among cases or the corresponding index date among controls. Bisphosphonate use was categorised as ever versus never users. Ever users were divided according to the total time since first prescription. Main outcome measures: Cases were defined as women aged 65 years or older with a first diagnosis of subtrochanteric or diaphyseal fracture, recorded in the BIFAP database between 1 January 2005 and 31 December 2008, and with at least 1 year of follow-up before the index date. For each case, five age-matched and calendar-year-matched controls without a history of hip or atypical fracture were randomly selected from the database. Statistical analysis: OR of atypical femoral fracture by bisphosphonate use was determined using conditional logistic regression. Models were adjusted for comorbidities and use of other medications. Results: The analysis included 44 cases and 220 matched controls (mean age, 82 years). Ever use of bisphosphonates was more frequent in cases than controls (29.6% vs 10.5%). In multivariate analyses, OR (95% CI) of atypical femoral fracture was 4.30 (1.55 to 11.9) in ever versus never users of bisphosphonates. The risk increased with long-term use, with an OR of 9.46 (2.17 to 41.3) comparing those using bisphosphonates over 3 years versus no users (p for trend=0.01). Conclusions: Bisphosphonate use was associated with an increased risk of subtrochanteric or diaphyseal fractures in elderly women in a low fracture risk population, with a higher risk among long-term bisphosphonate users.
Data from: Fractured genetic connectivity threatens a southern California puma (Puma concolor) population
Pumas (Puma concolor; also known as mountain lions and cougars) in southern California live among a burgeoning human population of roughly 20 million people. Yet little is known of the consequences of attendant habitat loss and fragmentation, and human-caused puma mortality to puma population viability and genetic diversity. We examined genetic status of pumas in coastal mountains within the Peninsular Ranges south of Los Angeles, in San Diego, Riverside, and Orange counties. The Santa Ana Mountains are bounded by urbanization to the west, north, and east, and are separated from the eastern Peninsular Ranges to the southeast by a ten lane interstate highway (I-15). We analyzed DNA samples from 97 pumas sampled between 2001 and 2012. Genotypic data for forty-six microsatellite loci revealed that pumas sampled in the Santa Ana Mountains (n = 42) displayed lower genetic diversity than pumas from nearly every other region in California tested (n = 257), including those living in the Peninsular Ranges immediately to the east across I-15 (n = 55). Santa Ana Mountains pumas had high average pairwise relatedness, high individual internal relatedness, a low estimated effective population size, and strong evidence of a bottleneck and isolation from other populations in California. These and ecological findings provide clear evidence that Santa Ana Mountains pumas have been experiencing genetic impacts related to barriers to gene flow, and are a warning signal to wildlife managers and land use planners that mitigation efforts will be needed to stem further genetic and demographic decay in the Santa Ana Mountains puma population.
Swath Bathymetry Pitman fracture zone
<p>Swath bathymetry for R.V. Ewing 89</p>
FIGURE 10 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 10. Storthyngura yuzhmorgeo sp. nov. paratype female, MIMB 24421. A, body dorsal view; B, body lateral view; C, head dorsal view; D, pleotelson ventral view. Scale bar = 1 mm.
FIGURE 9 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 9. Storthyngura yuzhmorgeo sp. nov. holotype male, MIMB 24420. A, body dorsal view; B, body lateral view; C, head dorsal view; D, pleotelson ventral view. Scale bar = 1 mm.
FIGURE 11 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 11. Storthyngura yuzhmorgeo sp. nov. paratype female, MIMB 24421. Antennula, dorsal view and mouth parts.
FIGURE 8 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 8. Rectisura sp., damaged specimen from the Argentina Basin, RV "Akademik Kurchatov" cruise 43, St. 4907, depth 5218 m. Scale bar = 1 mm.
FIGURE 7 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 7. Rectisura slavai sp. nov., juvenile female, MIMB 24419. A, body dorsal view; B, body lateral view; C, pereonites 2–4, lateral margins, antennula and a basis of antenna 2. Scale bar = 1 mm.
FIGURE 13 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 13. Storthyngura yuzhmorgeo sp. nov. paratype female, MIMB 24421. Pereopods 1, 5–7; pleopods 3–5.
FIGURE 4 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 4. Rectisura slavai sp. nov., holotype female, MIMB 24418. Maxillae and left mandible, ventral and medial views.
FIGURE 3 in Description of two new species of munnopsid isopods (Crustacea: Isopoda Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone Pacific Ocean
FIGURE 3. Rectisura slavai sp. nov., holotype female, MIMB 24418. Left antennula, dorsal view, antenna 2 dorsal view, maxilliped, ventral view; a half of hypopharynx.
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.