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84 results for “Thrusting”
Optimal low thrust transfers among asteroid belt asteroids.
<p>This dataset contains > 3,000,000 optimal low-thrust transfers between asteroids in the belt. It was created from the asteroids data released during the 12th edition of the Global Trajectory optimization competitions (see the <a href="https://sophia.estec.esa.int/gtoc_portal/">official GTOC portal</a>) and considering a spacecraft having an initial mass <strong>ms</strong> in the range [700, 8000] kg, a maximum thrust <strong>TM</strong> = 0.6 N with a specific impule <strong>Isp</strong> = 4000 s, resulting in possible initial acceleration levels in the range [7.5 1e-5, 8.6 1e-4] m/s^2.</p> <p>The dataset was developed in the context of our contribution to the International Symposium on Space Flight Dynamics 2024 (ISSFD).</p> <p>Starting from a sampled asteroid couple <strong>(As</strong> <strong>Af)</strong>, and an initial mass <strong>ms:</strong></p> <ul> <li>The minimum time transfer <strong>tof_min </strong>is found solving the corresponding optimal control problem (in a Keplerian dynamics) and the resulting transfer recorded in a first dataset.</li> <li>In some cases, for several fixed <strong>tof</strong> > <strong>tof_min</strong> the maximum final mass transfer is found solving the corresponding optimal control problem and the resulting transfer recorded in a second dataset.</li> </ul> <p>Each line in the csv dataset correspond to a specific optimal transfer (randevouz) and contains the following information:</p> <p>[<strong>xs</strong>, <strong>ys</strong>, <strong>zs</strong>, <strong>vxs</strong>, <strong>vys</strong>, <strong>vzs</strong>, <strong>xf</strong>, <strong>yf</strong>, <strong>zf</strong>, <strong>vxf</strong>, <strong>vyf</strong>, <strong>vzf</strong>, <strong>ms</strong>, <strong>tof</strong>, <strong>mf</strong>, <strong>MIMA</strong>, <strong>MIMA2</strong>, <strong>MIMA3</strong>, <strong>mfms_approx</strong>]</p> <p>, i.e. the starting (<strong>s</strong>) spacecarft state, the final (<strong>f</strong>) spacecraft state, the starting spacecraft mass <strong>ms</strong>, the time of flight <strong>tof </strong>and the final mass <strong>mf</strong>. Several analytical approximations are also reported: <strong>MIMA</strong>, <strong>MIMA2,</strong> <strong>MIMA3, mfms_approx.</strong></p> <p>The analytical approximation <strong>MIMA</strong> is derived and published in:</p> <ul> <li>Hennes, D., Izzo, D., & Landau, D. (2016, December). Fast approximators for optimal low-thrust hops between main belt asteroids. In <em>2016 IEEE Symposium Series on Computational Intelligence (SSCI)</em> (pp. 1-7). IEEE.</li> </ul> <p>A second improved version (<strong>MIMA2</strong>) is derived and published in:</p> <ul> <li>Izzo, D., Märtens, M., L. Beauregard ..., G. Acciarini et al. "Asteroid Mining: ACT&Friends’ Results for the GTOC 12 Problem." <em>to appear in Astrodynamics (Springer).</em></li> </ul> <p>and the final one, <strong>MIMA3,</strong> is derived and published in:</p> <ul> <li>G. Acciarini, Beauregard L. and Izzo, D., Computing low-thrust transfers in the asteroid belt, a comparison between astrodynamical manipulations and a machine learning approach. <em>ISSFD conference, Darmstadt, 2024</em>.</li> </ul> <p>The MIMAs approximate the maximum initial mass a spacecarft can have to perform a given fixed time transfer (that also is, in the optimal time of flight transfer dataset <strong>ms</strong>). For these transfers no coast arc exists. In all other cases, a related analytical approach can be used to approximate <strong>mf</strong>. The result, when available is added to the dataset as <strong>mfms_approx </strong>(approximating the ratio <strong>mf/ms</strong>, an approximation for the final mass can be retreived multiplying by <strong>ms</strong>)</p> <p> </p> <p>NOTE: the <strong>MIMAs</strong> and <strong>mfms_approx </strong>sometimes fail numerically or conceptually in which case a nan is reported or a 'nonsensical' number (e.g. lower than the actual starting mass).</p> <p>NOTE: The second version of the dataset corrects some trajectories in the time-optimal dataset that were not time optimal since during the optimization they hit a lower bound on the mass (500kg). They have now been removed. Thanks to Hongxin Shen for testing and reporting the issue.</p> <p> </p>
Thrust-dominated unilateral rupture of a blind listric fault associated with the 2024 Hualien earthquake
<p>Slip model and the interferometric synthetic aperture radar (InSAR) of the 2024 Hualian Mw 7.4 earthquake.</p>
Fig. 1 in Suraqalatia Brasieri Görmuş, Lawa & Nuaimy, 2017 (Larger Benthic Foraminifera; Suraqalatiidae N. Fam.) From The Late Maastrichtian Of The Tarbur Formation (Zagros Fold-Thrust-Belt) And Remarks On Dicyclina Munier-Chalmas, 1887
Fig. 1 Location map of the Naghan and Mandegan sections (B: from google maps).
Regional thermal history trends from the Idaho-Montana fold thrust belt using multiple low-T thermochronometers
<p><span>Low-temperature thermochronometric data can reveal the long-term evolution of erosion, uplift, and thrusting in fold-thrust-belts. We present results from central-Idaho and southwestern-Montana, where the close spatial overlap of the Sevier fold-thrust-belt and Laramide-style, basement-involved foreland uplifts signify a complex region with an unresolved, long-term tectono-thermal history. Inverse QTQt thermal-history modeling of new zircon (U-Th)/He (ZHe, n=106), and apatite (U-Th)/He dates (AHe, n=43) collected from hanging walls of major thrusts systems along a central-Idaho to southwestern-Montana transect, and apatite fission track (AFT) results from 6 basement samples, reveal regional thermal and spatial trends related to Sevier and Laramide orogenesis. Inverse modeling of foreland basement uplift samples suggest Phanerozoic exhumation initiated as early as ~80 Ma and continued through the early-Paleogene. Inverse modeling of interior Idaho fold-thrust-belt ZHe samples documents mid-Cretaceous cooling at ~125 Ma in the Lost River Range (western transect), and a younger cooling episode in the Lemhi Arch region (mid-transect) from as early as ~100 Ma through the late-Paleogene. This cooling in the Lemhi Arch temporally overlaps with cooling in southwestern-Montana’s basement-cored uplifts, which we interpret as roughly synchronous exhumation related to contractional tectonics and post-orogenic collapse. These data and models, integrated with independent timing constraints from foreland basin strata and previously published thermochronometric results, suggests that mid-Cretaceous deformation of southwestern-Montana’s basement-cored uplifts was low-magnitude and preceded tectonism along the classic California-Wyoming Laramide “corridor”. In contrast, late-Cretaceous and Paleogene thrust-related exhumation was more significant and largely complete by the Eocene. The basement-involved deformation was contemporaneous with and younger than along-strike Sevier belt thrusting in</span><span> </span><span>central-Idaho. </span></p>
Searching for deep-seated thrust faults on the moon
<p class="Abstract">The lunar maria are large expanses of basalt that infill antecedent impact basins and show evidence for post-emplacement deformation. Landforms within many of these basins suggest a period of compressive tectonics, although the mechanism for their formation remains an open question. Previous work for Mare Crisium demonstrated that basin-circumferential wrinkle ridges, which typically demarcate the inner edge of an annulus of elevated terrain, are the result of deep-seated thrust faults that preferentially form along the boundary of an elevated, superisostatic portion of mantle and a thick, subisostatic collar of crustal material. Here, we show that a similar fault architecture exists for several other mascon-bearing basins, including Maria Serenititis, Nectaris, Moscoviense, and, to a lesser degree, Humorum and Imbrium. These deeply penetrating basin-circumferential thrust faults, as for Mare Crisium, form a (partial) outward-dipping ring-fault system that bounds the elevated mantle plug beneath each basin as a geometric consequence of mascon evolution. If this geometric arrangement is unique to the Moon, then some characteristic(s) of lunar mascon evolution enables the formation of such mascon-bounding faults. Despite the ubiquitous nature of mascon-bound thrust ring faults at several lunar basins, the prevalence of such structures at mascon basins on other terrestrial worlds remains an open question.</p>
The 2021 MW 6.2 Mamuju, West Sulawesi, Indonesia Earthquake: Partial rupture of the Makassar Strait Thrust
<p>Aftershock data sets for Paper Meilano et. al., 2022, The 2021 MW 6.2 Mamuju, West Sulawesi, Indonesia Earthquake: Partial rupture of the Makassar Strait Thrust published at GJI</p>
Comparison of Simulated Standard Versus Modified Jaw Thrust I-gel Insertion Technique in Novice Anesthesiologists
ClinicalTrials.gov study NCT05545163. IPD Sharing: YES. Countries: 1. Publications: 7.
Evolution of the Greater Caucasus basement and formation of the Main Caucasus Thrust, Georgia
Open the record for dataset details and reuse information.
Orientation data for: Pre-thrusting stratigraphic control on the transition from a thin- to thick-skinned structural style: an example from the double-decker Idaho-Montana fold-thrust belt
Open the record for dataset details and reuse information.
Searching for deep-seated thrust faults on the moon
Open the record for dataset details and reuse information.
The GPS velocity of Kepingtagh fold-and-thrust belt
<p>Our GPS dataset for the Kepingtagh FTB started in 2008 and ended in 2019, using data from a variety of GPS instrument types. For every GPS campaign survey, we set 30s sampling rates and observed for 48-96 hours every GPS site to ensure that at least one full UTC session (and often two or more) was recorded. Our GPS observation network consists of 73 GPS stations across the entire Kepingtagh FTB (Table S1). We estimated GPS velocities for 32 campaign sites of the enhanced CMONOC project from 2008 to 2019, and 41 sites of our GPS campaigns measured in 2017, 2018, and 2019.</p>
Interplate slip rate variation between closely spaced earthquakes in southern Mexico: The 2012 Ometepec and 2018 Pinotepa Nacional thrust events
<p>Decimated seismic data used for the detection of REs.</p>
Data for paper: Segmented Thrust Faulting: Example from the Northeastern Margin of the Tibetan Plateau
<p>If additional data is needed, please contact me by E-mail: skatetangshan@vip.126.com</p>
Segmented Thrust Faulting: Example from the Northeastern Margin of the Tibetan Plateau
<p>If more information is needed, please contact the author by skatetangshan@vip.126.com</p>
Datasets for "Constraints on the geometry and frictional properties of the Main Himalayan Thrust using co-, post- and interseismic deformation in Nepal" "
<p>This contains GNSS and InSAR data used in the publication "Constraints on the geometry and frictional properties of the Main Himalayan Thrust using co-, post- and interseismic deformation in Nepal". GNSS data come as separate text files for east and north displacements and errors. Each text file consists of a number of columns. Each file has 40 columns, where the first column is time in decimal years after the Gorkha earthquake and the following columns correspond to each GNSS station. The time series are those obtained after the removal of "non-postseismic" deformation such as linear and sinusoidal terms</p> <p>The InSAR data are in the form of GMT GRD files at 200m resolution. Data are from Sentinel-1a track 19 and are a derived work of Copernicus data, subject to the ESA use and distribution conditions. The name of each GRD file is as follows: t19_{date1}_{date2}_hgt_ramp_200m.grd. Date 1 and date 2 are the dates of the two images used to make each interferogram.</p>
Strain partitioning and localization due to heterogeneities in the fold - and - thrust belt 2 detachment: Analogue models of progressive arcs
<p>Although most arcuate orogens are deformed as progressive arcs–curvature is acquired during12shortening-, they have been scarcely simulated by analogue modelling. Our team work designed13a backstop that deformed in map view building up fold-and-thrust belts (FTBs) that acquire14progressively its curved shape (Jiménez-Bonilla et al., 2020); silicone and sand layers15reproduced the brittle-ductile conditions expected to be common in external tectonic wedges.16However, natural cases usually includeheterogeneities in the detachment such as diapirs,17thickness variations of the viscous layer or pinch outs. Based on the same progressive arc model18setup, we present here seven new experiments including these three types of heterogeneities.19Our results show that strain was partitioned between shortening structures whose transport20directions draw a radial pattern and normal faults and oblique strike-slip faults that21accommodate arc-lengthening. Moreover, any heterogeneity conditions the wedge evolution and22the nucleation of structures. Both diapirs and the presence of a silicone pinch-out perpendicular23to the apex movement favour that frontal deformation slows down and the wedge thickens up to24reach the supercritical angle. Interestingly, the presence of diapirs or silicone thickness25variations favour the arc-parallel stretching localization close to these heterogeneities. In26addition, silicone bands parallel to the apex movement generate different structural styles along27the FTB. More frictional detachments favour thicker wedges and less frontal propagation.28Transfer zones accommodate the differential displacement between FTB segments. These29results may be useful to investigate geometric and kinematic changes along natural progressive30arcs such as the Gibraltar, Sulaiman and Zagros cases</p>
West Spitsbergen Fold and Thrust Belt: a digital educational data package for teaching structural geology
<p>The following digital educational data package is provided as part of the submission of the publication Horota et al. (2022) <em>West Spitsbergen Fold and Thrust Belt: a digital educational data package for teaching structural geology</em>, considered for publication in the Journal of Structural Geology. The dataset contains a QGIS, ArcGIS Pro and a Petrel projects with all the associated data.</p>
Simulations scripts for: Strain localization patterns and thrust propagation in 3-D discrete element method (DEM) models of accretionary wedges
<p>High-resolution three-dimensional discrete element method (DEM) simulations of sandbox-scale models of accretionary wedges performed in this study suggest thrusts follow a variety of propagation processes and orientations in the wedges depending on a number of factors including the stage of development of the wedge (precritical vs. critical), basal friction, and type of thrust (forward vs. backward-vergent). In terms of propagation processes, two clear mechanisms are identified. The first involves propagation from the decollement to the wedge top, similar to the standard model of thrust propagation seen in many kinematic models, and in the second, thrusts grow downward from an initial nucleation point just below the top surface of the wedge as well as upward from the decollement joining in the middle. In terms of orientation, forward-vergent thrusts initially form at Roscoe or Arthur orientations, and over shortening, form at Coulomb orientations. To arrive at these results, a wide array of continuum parameters and fields were extracted from the granular assembly of the DEM simulations, including stress, strain, strain rate, kinetic energy, Mohr-Coulomb parameters, and proximity to yielding using the Drucker-Prager criterion to visualize thrust nucleation and propagation. Lastly, the advantages and disadvantages of these continuum proxies for discerning failure in the granular assembly are considered, and the spatial and temporal relationship between proximity to yielding and strain localization (both pre-peak and persistent shear banding) in the granular model of an accretionary wedge is explored.</p>
Comparison of Anterior Chest Compression Assist and Abdominal Thrust Assist Technique COPD
ClinicalTrials.gov study NCT05936801. IPD Sharing: NO. Countries: 1. Publications: 6.
Jaw-thrust on Postoperative Sore Throat
ClinicalTrials.gov study NCT03568279. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
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