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67 results for “Torsion”
Is there a non-invasive biomarker for the early detection of ovarian torsion? A systematic review and meta-analysis
<p>We have performed a systematic review and meta-analysis and identified multiple biomarkers that warrant further study as part of a broader diagnostic panel for ovarian torsion. These include SCUBE1, s-DD, IL-6, IMA and TNF-a. </p>
Dataset: RC U-shaped walls subjected to in-plane, diagonal, and torsional loading: new experimental findings
<p>This dataset contains the processed experimental digital image correlation (DIC) technique data for two large-scale reinforced concrete U-shaped wall specimens tested at the Earthquake Engineering and Structural Dynamics Laboratory (EESD Lab), École Polytechnique Féderale de Lausanne (EPFL) in Switzerland. The abstract for the corresponding journal paper, submitted to <em>Engineering Structures</em>, is given below.</p> <p>Although reinforced concrete U-shaped walls are popular in construction practice internationally, there is a paucity of experimental research investigating the seismic performance of such salient elements. The present paper summarizes an experimental campaign on two slender U-shaped reinforced concrete walls detailed with a single-layer of reinforcement. State-of-the-art instrumentation was used to capture the three-dimensional displacement field of the wall surfaces using digital image correlation techniques. Experimental findings are presented, including strain profiles, equivalent plastic hinge lengths, longitudinal strains at the base, cracking distributions and widths, and out-of-plane deformations. The longitudinal strain profiles showed a yielding region up the boundary ends of the flanges of approximately 800 mm to 1200 mm in length, depending on the direction of loading and at large drift levels. Approximately half of the yielding zone length was found to be equal to the equivalent plastic hinge lengths, which were found to decrease as a function of drift. The longitudinal strains at the base of these walls showed some shear lag effects when subjected to in-plane or diagonal loading. For most directions of loading, the largest crack widths were found to be associated with flexural-shear or shear cracks. When subjected to a pure torque, the vertical strain distribution at the base of the wall correlated with the theoretical distribution for an open section governed by warping torsion. The out-of-plane deformations were primarily concentrated within a small region towards the ends of the flanges prior to the local buckling failures that were observed experimentally.Although reinforced concrete U-shaped walls are popular in construction practice internationally, there is a paucity of experimental research investigating the seismic performance of such salient elements. The present paper summarizes an experimental campaign on two slender U-shaped reinforced concrete walls detailed with a single-layer of reinforcement. State-of-the-art instrumentation was used to capture the three-dimensional displacement field of the wall surfaces using digital image correlation techniques. Experimental findings are presented, including strain profiles, equivalent plastic hinge lengths, longitudinal strains at the base, cracking distributions and widths, and out-of-plane deformations. The longitudinal strain profiles showed a yielding region up the boundary ends of the flanges of approximately 800 mm to 1200 mm in length, depending on the direction of loading and at large drift levels. Approximately half of the yielding zone length was found to be equal to the equivalent plastic hinge lengths, which were found to decrease as a function of drift. The longitudinal strains at the base of these walls showed some shear lag effects when subjected to in-plane or diagonal loading. For most directions of loading, the largest crack widths were found to be associated with flexural-shear or shear cracks. When subjected to a pure torque, the vertical strain distribution at the base of the wall correlated with the theoretical distribution for an open section governed by warping torsion. The out-of-plane deformations were primarily concentrated within a small region towards the ends of the flanges prior to the local buckling failures that were observed experimentally.</p>
Novel biodegradable Zn alloys obtained by rapid solidification and high pressure torsion - NCN Poland Project - Dataset Feb.2024
<p>Dataset contains results obtained during the first year of the project No. 2021/40/C/ST5/00071 "Novel biodegradable Zn alloys obtained by rapid solidification and high pressure torsion" funded by NCN Poland. </p> <p>The dataset contains: SEM, TEM, nanoindentation, hardness and uniaxial tensile testing results. </p>
Peculiar torsion dynamical response of spider dragline silk
<p>These data are related to our paper "Dabiao Liu, Longteng Yu, Yuming He*, Kai Peng, Jie Liu, Juan Guan, and D. J. Dunstan. Peculiar Torsion Dynamical Response of Spider Dragline Silk. Applied Physics Letters, 111 (2017), 013701." In this work, the torsional properties of spider dragline silks from Nephila edulis and Nephila pilipes spiders are investigated by using a torsion pendulum technique. A permanent torsional deformation is observed after even small torsional strain. This behaviour is quite different from that of the other materials tested here, i.e., carbon fiber, thin metallic wires, Kevlar fiber, and human hair. The spider dragline thus displays a strong energy dissipation upon the initial excitation (around 75% for small strains and more for a larger strain), which correspondingly reduces the amplitude of subsequent oscillations around the new equilibrium position. The variation of torsional stiffness in relaxation dynamics of spider draglines for different excitations is also determined. The experimental result is interpreted in the light of the hierarchical structure of dragline silk.</p> <p>This project has received funding from the EU’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 704292.</p>
Dataset: Decay of Torsional Stiffness of RC U-shaped Walls When Subjected Simultaneously to In-Plane Loading
<p>Reinforced concrete U-shaped walls are a popular construction choice, commonly used to resist the lateral loads from wind and earthquakes. When subjected to earthquake ground motions, it is likely that these structural elements will not only bend in flexure but twist due to asymmetries of the building plan layout and the location of the shear center outside of the section. This research investigates the dependency of the torsional stiffness of U-shaped walls on the in-plane translational displacement demands using novel experimental evidence and advanced numerical models. The experimental results show that for a given flexural position, the torsional stiffness decreases with increasing in-plane translational displacement. Furthermore, the numerical and experimental results indicate that when the wall is centered the torsional stiffness degrades at the same rate at the translational stiffness of the walls. Thus, the torsional stiffness of a U-shaped wall as a function of ductility can be estimated using the translational secant stiffness. The numerical results also show that the torsional stiffness increases as a function of the axial load ratio of the wall. The experimental and numerical dataset from this research investigation can be downloaded from a publicly accessible repository.</p>
An archive of data from Resonant Column and Cyclic Torsional Shear Tests performed on Italian Clays
<p>A large data-set of index and dynamic parameters measured from resonant column (RC) and cyclic torsional shear(CTS) tests on 170 undisturbed isotropically consolidated fine-grained specimens deriving from 90 sites in Central and Northern Italy is made available. Tests were all performed over the past 20 years at the Geotechnical Laboratory of the Civil and Environmental Engineering Department of the Florence University using the same apparatus and following the same standardized procedures.</p> <p>The experimental data are organized in an excel file (named as “Italian_Clays_Archive.xlsx”). For each tested sample, the main physical, index and dynamic properties measured are archived with the code number of the sample (No) in the sheet named as “Dataset” as well as any information available about the borehole from which the sample has been taken. The list and the meaning of the symbols used can be found in the sheet named as “Legend”. Other sheets containing borehole stratigraphy are named as “XX-ST” (where “XX” stands as the bore-hole code, BH) and they can be recalled directly from the “Dataset” sheet. Note that stratigraphy is given in its original format, when available. However, depth and thickness of each layer can be easily deduced by the figure provided and the soil lithology is well represented by the symbol used that are those generally adopted internationally. Finally, the sheets named as "YY-CTS-STEPZ" (where “YY” and “Z” stand as the sample code, No, and the step number, respectively) contain the shear stress and strain values measured after CTS tests at different steps (i.e. amplitudes of the cyclic dynamic torsional loading applied) during the 1st, 5th, 15th, 20th and 25<sup>th</sup>.and/or and/or the corresponding shear modulus and damping ratio calculated from the same cycles.</p> <p>The selected samples were taken mostly in Holocene and Pleistocene fluvio-lacustrine soil deposits at depths ranging from 1 m to 75 m below ground level and they mainly consist of normally and over-consolidated clayey silts or clays (1 < OCR < 9.4) of medium-to-high plasticity (4 < PI < 84), with very low-to high consistency (-1< Ic < 1.9) and initial void ratio, e<sub>0</sub>, ranging between 0.175 and 2.456. The database also includes some samples of organic clays of low consistency, very high water content and void ratio and low unit weight. The initial (small strain) values of shear modulus, G<sub>0</sub>, and damping ratio, D<sub>0</sub>, range between 21 MPa and 292 MPa and between 0.8% and 5.1%, respectively. The smallest and the largest shear strain values induced by RC and CTS tests are 1.9x10<sup>-5</sup> % and 6.3x10<sup>-1</sup>%, respectively.</p>
Torsion Pendulum Clock - Animation
This object is a reproduction of the famous torsion pendulum clock. Mesh update with animation 21/11/2021. Texture 2048x2048. 2 Slot materials: one for the mesh and one for the glass. Royalty Free. Source: Objaverse 1.0 / Sketchfab
Data and Source codes for: Real-time Radial Tagging for Quantification of Left Ventricular Torsion
<p> </p> <p>Magnetic Resonance Imaging measurement raw data, simulation, and reconstruction codes used in our paper about ‘Real-time Radial Tagging for Quantification of Left Ventricular Torsion' (DOI:10.1002/mrm.29169).</p> <p> </p> <p> </p> <p> </p>
Supporting materials for "Suppressing torsional buckling in auxetic meta-shells"
<p>The repository of the supporting materials for the manuscript entitled "Suppressing torsional buckling in auxetic meta-shells"<br>Supporting materials include:</p> <ol> <li>Experimental and finite element data sets</li> <li>Python codes for (i) analyzing the data and visualizing the figures in the manuscript and (ii) performing image analysis to obtain the radial strain of the meta-shells</li> <li>CAD files used for 3D printing the models and simulating them via finite element simulation</li> <li>The input files for the finite element analysis.</li> </ol>
Transverse and torsional vibration on bowed cello G steel string
<p>Transverse and torsional vibrations from a cello G string made of steel, product name "Pirastro Chromcor medium".</p> <p>Transverse signal taken electrodynamically below bow contact point,while string is mounted on a monochord and tuned to 98 Hz.</p> <p>Torsional signal taken electrodynamically at either 10 mm from the bow contact point towards the bridge side, or close string termination (all file names containing *_torsion zum steg_*.mat) or at 10 mm from the bow contact point towards the nut side, or more distant string termination (all file names containing *_torsion zum sattel_*.mat). The number in the filename indicates the distance of the bow contact point from the bridge in cm, while the string has a free length of 68 cm, e.g. the file *_11_*.mat contains data for bowstrokes at 11 cm distance from the bridge. Upstrokes/downstrokes are indicated by *_u.mat and *_d.mat in the file name. Dates of recording indicated in the file name by session_yyyymmdd_*.mat.</p> <p>Manual bowing by experienced player, while each individual stroke covers a wide range for bow velocity and bow pressure, however, always exciting regular Helmholtz motion on the string. Only the file session_*_doppelzahn represents data for a non-Helmholtz case. Statistical analyses cover the wide dynamic range, and structural analyses use smaller windows of comparable levels, the position of which are indicated in the files startpunkte_*.m.</p> <p>File formats are MATLAB files. For all *.mat files: column 1 of table Y is the transverse time signal (0.1 per mm), column 2 the torsional time signal (0.004 per 1°). Sampling frequency is 48 kHz. </p> <p> </p>
Optically measured torsional waves on cello string bowed at varying bow force
<p>Transverse and torsional vibrations of a cello G string made of steel, product name "Pirastro Chromcor medium". Find string properties below. String mounted on a monochord and tuned to approximately 98 Hz.</p> <p>Measurements by a high speed camera at 7000 frames per second, on axis with the bowed string (displacement < 20°).</p> <p>Transverse: optical marker on the string (transverse), 70 mm away from the bridge, 10 mm away from the bow contact point.</p> <p>Torsional: optical marker at each end of two needles (top, and bottom, each 4mm long, total weight including marker 0.002 g), 70 mm away from the bridge, 10 mm away from the bow contact point.</p> <p>Manual bowing by experienced player, bowing at the target contact point 80 mm away from bridge, while each individual stroke represents a certain level of bow pressure. Only regular Helmholtz motion is excited on the string. For each level (high, medium, low) the player adjusted bow velocity reasonably.</p> <p>* Raw data: movies</p> <p>Torsion3.avi : medium bow force<br> Torsion5.avi : low bow force<br> Torsion6.avi : high bow force<br> </p> <p>* Data, 1st level of abstraction: extracted traces using subpixel tracking</p> <p>Tables in *.mqa format hold pixel row and column of extracted optical marker (top,transverse, botteom) for respective bow force (3=medium, 5=low,6=high).</p> <p> </p> <p>* Data, 2nd level of abstraction: angle of torsional displacement as derived from optical markers and geometry, versus bow force</p> <p>torsion_angle_vs_3_force_levels (eps, and MATLAB fig).</p> <p> </p> <p>* String properties</p> <p>mass per unit length g/m 6.15</p> <p>diameter mm 1.19</p> <p>nominal tension N 121</p> <p>transverse wave speed <em>v<sub>tra</sub></em> m/s 133</p> <p>transverse wave impedance <em>Z<sub>0</sub></em> kg/s 0.93</p> <p>torsional fundamental frequency Hz 543</p> <p>torsional wave speed <em>v<sub>tor </sub></em>m/s 738</p> <p> </p>
Biomechanics of the Finger Pad in Response to Torsion
<p>This dataset was used in the paper "Biomechanics of the Finger Pad in Response to Torsion". <br> The paper was not published at the time of dataset upload and no DOI was attributed to it yet. A preprint is available on bioRxiv, https://doi.org/10.1101/2022.11.07.515186.<br> We refer the reader to this publication for detailed methods.<br> <br> In brief, we have made public :<br> - The raw forces and platform kinematics files.<br> - 1DxTime variables extracted from the videos such as displayed in our Fig. 2A.<br> - 1D summary variables over trials (for example the angle at full slip for each trial).<br> </p>
Torsion of the Tibial Tuberosity, a New Factor of Patellar Instability?
ClinicalTrials.gov study NCT03304119. IPD Sharing: NO. Countries: 1. Publications: 6.
Near-Infrared Spectroscopy for Pediatric Acute Scrotum and Testicular Torsion
ClinicalTrials.gov study NCT01812109. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Fragment and torsion biasing algorithms for construction of small organic molecules in proteins using DOCK
Open the record for dataset details and reuse information.
Video of 1/1-45° braided composite tube tested under torsion on Instron 8802
<p>Supplementary data for article</p> <p>Chai, Yuan, Ying Wang, Zeshan Yousaf, Nghia T. Vo, Tristan Lowe, Prasad Potluri, and Philip J. Withers. "Damage evolution in braided composite tubes under torsion studied by in-situ X-ray computed tomography." <em>Composites Science and Technology</em> (2019): 107976.</p> <p><a href="https://doi.org/10.1016/j.compscitech.2019.107976">https://doi.org/10.1016/j.compscitech.2019.107976</a></p>
Data from: Utility of real-time shear wave elastography in the assessment of testicular torsion
Real-time shear-wave elastography (SWE) is a newly developed method which can obtain the stiffness of tissues and organs based on tracking of shear wave propagation through a structure. Several studies have demonstrated its potential in the differentiation between diseased and normal tissue in clinical practices, however the applicability to testicular disease has not been well elucidated. We investigated the feasibility and reproducibility of SWE in the detection of testicular torsion. This prospective study comprised 15 patients with complete testicular torsion. Results obtained from SWE along with conventional gray-scale and color Doppler sonography and post-operative pathology were compared. The results revealed that (i) the size of injured testis was increased and the twisted testis parenchyma was heterogeneous. The blood flow signals in injured testis were barely visible or absent; (ii) The Young's modulus, including Emean, Emax, Emin and SD values in the border area of torsional testis were higher than those of normal testis (Emean, 78.07±9.01kPa vs 22.0±5.10kPa; Emax,94.07±6.53kPa vs 27.87±5.78kPa; Emin, 60.73±7.84 kPa vs 18.90±4.39kPa; SD, 7.67±0.60 kPa vs 2.30±0.36 kPa, [P<0.05]); The Emax and SD values in the central area of the torsional testis were higher than the corresponding area of the normal testis (Emax, 8.23±0.30 kPa vs 3.97±0.95kPa; SD, 1.5±0.26kPa vs 0.67±0.35kPa,[P<0.05]) and Emin values was lower than those of normal testicles(0.93±0.51kPa vs 1.6±0.36kPa; [P<0.05]); (iii) The Young's modulus measurement between two physicians showed good agreement. The pathological findings were accordance with SWE measurement. SWE is a non-invasive, convenient and high reproducible method and may serve as an important alternative tool in the diagnosis and monitoring the progression of the acute scrotums, in additional to conventional Doppler sonography.
Twist - torsion coupling in beating axonemes
<p>The dataset published here was used to measure a<strong> high resolution 3D wavefom </strong>of isolated and <strong>reactivated axonemes from <em>Chlamydomonas reinhardtii</em></strong>.</p> <p><a href="https://doi.org/10.1101/2024.03.18.585533"><span><span>doi:</span> https://doi.org/10.1101/2024.03.18.585533 </span></a></p> <p>It was further used to show <strong>twist-torsion coupling </strong>in these axonemes.</p> <p>The data is organized in six folders:</p> <p><strong>1) high resoluton 3D averaged waveform of isolated and reactivated axonemes from <em>Chlamydomonas Reinhardtii</em>.</strong><br>Data files (MATLAB and txt format) contain the 3D coordinates (along the 3D arc-length) of 32 axonemal shapes that comprise one beat cycle. <br>A corresponding txt file describes the details of the dataset. </p> <p><strong>2) 3D waveforms of single isolated and reactivated axonemes from <em>Chlamydomonas Reinhardtii</em>.</strong><br>Data files (MATLAB and txt format) contain the 3D shapes of 17 individual axonemes obtained from defocused darkfield-microsopy images. <br>A corresponding txt file describes the details of the dataset.</p> <p><strong>3) Image Raw Data of single isolated and reactivated axonemes used to reconstruct the 3D waveform<br></strong>Movie files (multi-layer tif) of reactivated axonemes imaged with defocused-darkfield-microscopy. <br>A corresponding txt file describes the details of the dataset.<strong><br></strong></p> <p><strong>4) Calibration of defocused darkfield-microscopy. <br></strong>Data file (MATLAB) contains the relationship between the z-position relative to the focal plane and the full-width-at-half-maximum (FWHM) of the axoneme signal, measured normal to the centerline as well as the z-stack of imges (multi-layer tif) used to extract this relation. <br>A corresponding txt file describes the details of the dataset.</p> <p><strong>5)</strong> <strong>Distance between gold nano paricle (GNP) and the axonemal centerline as a function of the beat cycle</strong><br>Data file (MATLAB) contains 20 measurements of d_C (where d_C is the normal distance between the center position of the GNP and the axoneme centerline in 2D images) as a function of time. A corresponding txt file describes the details of the dataset.</p> <p><strong>6) Image Raw Data of single isolated and reactivated axonemes with attached GNPs used to measure d_C. <br></strong>Movie files (multi-layer tif) of reactivated axonemes with attached gold nano particles (GNPs) imaged with darkfield-microscopy. <br>A corresponding txt file describes the details of the dataset.</p>
Laser cooling a centimeter-scale torsion pendulum
<p>We laser cool a centimeter-scale torsion pendulum to a temperature of 10 mK (average occupancy of 6000 phonons) starting from room temperature (equivalent to ~10^8 phonons). This is achieved by optical radiation pressure forces conditioned on a quantum-noise-limited optical measurement of the pendulum’s angular displacement with an imprecision 13 dB below that at the standard quantum limit (SQL). The measurement sensitivity is the result of a novel ‘mirrored’ optical lever that passively rejects extraneous spatial-mode noise by 60 dB. The high mechanical quality (10^7) and quantum-noise-limited sub-SQL measurement imprecision demonstrate the necessary ingredients for realizing the quantum ground state of torsional motion — a pre-requisite for mechanical tests of gravity’s alleged quantum nature.</p>
Data for: Real-time Radial Tagging for Quantification of Left Ventricular Torsion
<p>Magnetic Resonance Imaging measurement and simulation data used in our research about ‘Real-time Radial Tagging for Quantification of Left Ventricular Torsion'.</p>
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