63,097 research outputs found
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
IMPACTO DE LA EXPOSICIÓN AL ABANDONO Y MALTRATO INFANTIL EN EL DESARROLLO SOCIOEMOCIONAL: REVISIÓN SISTEMÁTICA
No full textDíaz-Urgorri Emparanza, Carmen Chai; director de proyecto: Sorrel Luján, Miguel Ángel2024-2025Máster Universitario en Psicología General SanitariaFacultad de Medicin
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Growth and properties of magnetron cosputtering grown Mn(x)Ge(1-x)on Si(001)
No full textWe have grown MnxGe1-x films (x=0, 0.06, 0.1) on Si (001) substrates by magnetron cosputtering, and have explored the resulting structural, morphological, electrical and magnetic properties. X-ray diffraction results show there is no secondary phase except Ge in the Mn0.06Ge0.94 film while new phase appears in the Mn0.1Ge0.9 film. Nanocrystals are formed in the Mn0.06Ge0.94 film, determined by field-emission scanning electron microscopy. Hall measurement indicates that the Mn0.06Ge0.94 film is p-type semiconductor and hole carrier concentration is 6.07 X 10(19) cm(-3) while the MnxGe1-x films with x=0 has n-type carriers. The field dependence of magnetization was measured using alternating gradient magnetometer, and it has been indicated that the Mn0.06Ge0.94 film is ferromagnetic at room temperature. (c) 2005 Elsevier Ltd. All rights reserved
Viscous Fluid Dissipation for Filtering Poor Bandgaps and Achieving Low-Frequency Bandgaps in Metamaterials
No full textEmbedding viscous fluids in soft elastic metamaterials offers transformative potential for engineering applications, particularly in vibration control and acoustic filtering. Despite this promise, effectively leveraging fluid viscosity to achieve low-frequency, high-quality bandgaps remains a significant challenge. Specifically, fluid viscosity shifts local resonance modes to lower frequencies while mitigating negative dynamic effective properties, resulting in smoother transmission spectra. By incorporating viscous liquids as resonant units, it is demonstrated how vibrational acoustic coupling and viscous dissipation can be harnessed to engineer superior bandgap properties. The bandgap characteristics of locally resonant metamaterials with viscous liquid fillings are systematically investigated through theoretical analysis, numerical simulations, and experimental validation. The bandgap shifted to lower frequencies by up to 5.6% within the concerned viscosity range, accompanied by a 4.1% bandwidth expansion. This overturns the conventional notion that viscous dissipation reduces system performance, showcasing its positive impact on bandgaps. This work redefines viscous dissipation, usually considered a limitation, as a key enabler for achieving broadband, high-performance low-frequency bandgaps, unlocking new possibilities for advanced acoustic and vibration isolation technologies
Video of 1/1-45° braided composite tube tested under torsion on Instron 8802
No full textSupplementary data for article
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." Composites Science and Technology (2019): 107976.
https://doi.org/10.1016/j.compscitech.2019.107976</p
Relations between x-ray timing features and spectral parameters of galactic black hole x-ray binaries
No full textWe present a study of correlations between spectral and timing parameters for a sample of black hole X-ray binary candidates. Data are taken from GX
339-4, H 1743-322, and XTE J1650-500, as the Rossi X-ray Timing Explorer
(RXTE) observed complete outbursts of these sources. In our study we investigate outbursts that happened before the end of 2009 to make use of the high-energy coverage of the HEXTE detector and select observations that
show a certain type of quasi-periodic oscillations (type-C QPOs). The spectral parameters are derived using the empirical convolution model simpl to model the Comptonized component of the emission together with a disc blackbody for the emission of the accretion disc. Additional spectral features, namely a reflection component, a high-energy cut-off, and excess emission at 6.4 keV, are taken into account. Our investigations confirm the known positive
correlation between photon index and centroid frequency of the QPOs and reveal an anti-correlation between the fraction of up-scattered photons and the QPO frequency. We show that both correlations behave as expected in the “sombrero”
geometry. Furthermore, we find that during outburst decay the correlation between photon index and QPO frequency follow a general track, independent of individual outbursts
FLUID-STRUCTURE INTERACTION OF TWO-PHASE SCATTERER METAMATERIALS FOR VIBRATION SELF-SUPPRESSION
No full textIntegrated experiments on field monitoring and hydro-mechanical modeling for determination of a triggering threshold of rainfall-induced shallow landslides. A case study in Ren River catchment, China
No full textUnderstanding the hydrological mechanism of rainfall-induced shallow landslides is critical to make reliable predictive assessments
and to reduce risks of economic loss and fatalities. An integrated approach was identified by combining the field-based
monitored hydrological data with a hydro-mechanical analysis, which can be utilized to better understand seasonal hydrological
features in shallow soils and the corresponding triggering mechanism of rainfall induced shallow landslides, with the aim of
setting up an improved landslide early warning system. A hydrological monitoring system on a representative slope that was
experiencing frequent local shallow failures in the Ren River catchment was constructed to provide available seasonal hydrological
features with regard to time trends in volumetric water content and pore water pressure in shallow soils. A transition of
vertical downward flow from unsaturated to near-saturated conditions has been fully detected since the significant saturation
degree and associated pore pressure varies with vertical depths. Consequently, the triggering mechanism of shallow landslides
should be associated with the combined effects of dissipation of matrix suction in the upper unsaturated zone and increased
positive pore pressure due to the generation of a temporal perched water table in the deeper saturated zone. This process was
confirmed through the field evidence and a back analysis on the long-term hydrological evolution of slope soil using a calibrated
one-dimensional hydrological model. Antecedent hydrological conditions were also found to have an effect on rainfall intensity–
duration thresholds in the landslide early warning system based on a hydro-mechanical analysis, with the aim of improving the
accuracy of the model’s predictive ability. The results indicated that this research promoted the effectiveness of a landslide early
warning system through a hydro-mechanical analysis based on capturing the real hydrological features of a landslide
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Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging
No full textThis thesis reports an investigation into dual-energy X-ray discrimination techniques. These techniques are designed to provide colour-coded materials discrimination information in a sequence of perspective images exhibiting sequential parallax. The methods developed are combined with a novel 3D imaging technique employing depth from motion or kinetic depth effect (KDE). This technique when applied to X-ray images is termed KDEX imaging and was developed previously by the university team for luggage screening applications at security checkpoints. A primary motivation for this research is that the dual-energy X-ray techniques, which are routinely incorporated into ‘standard’ 2D luggage scanners, provide relatively crude materials discrimination information. In this work it was critical that robust materials discrimination and colour encoding process was implemented as the sequential parallax exhibited by the KDEX imagery may introduce colour changes, due to the different X-ray beam paths associated with each perspective image. Any introduction of ‘colour noise’ into the resultant image sequences could affect the perception of depth and hinder the ongoing assessment of the potential utility of the dual-energy KDEX technique. Two dual-energy discrimination methods have been developed, termed K-II and W-E respectively. Employing the total amount of attenuation measured at each energy level and the weight fraction of layered structures, a combination of the K-II and the W-E techniques enables the computation and extraction of a target objects’ effective atomic number (Zeff) and its surface density (ρS) in the presence of masking layers
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