74,863 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
Examination of Pervious Pavement Pore Parameters with X-Ray Tomography
No full textPervious pavement (PP) is an infrastructure material that can alter rainfall-runoff relationships, filter particulate matter (PM), and
sequester runoff constituents. Beyond a measure of total porosity ( φt), less-commonly measured pore parameters and relationships thereof
influence these phenomena. In this study, cementitious PP (CPP), used as a permeable surface for an exfiltration system loaded by runoff, was examined. X-ray tomography (XRT) was utilized to examine pore size and frequency, generate a total-to-effective porosity (φt − φe) relation- ship, quantify pore tortuosity (Le=L), and relationships for specific surface area (SSA), pore-size distributions ðPSDÞpore, and φt. Gravimetric analyses were used for SSA based on mass ðSSAÞs as well as validation of XRT porosity. Results indicate that φt ranged from 10 to 30% while φe ranged from 4 to 27%. Relationships for (φt − φe), SSA, φt, and median pore diameter (d50n) were represented with a power law model (PLM). Using φt the ðSSAÞpt of pores ranged from 11,000 to 19,000 m2=m3 while for φe, ðSSAÞpe ranged from 12,000 to 21,000 m2=m3. XRT results show that the ðPSDÞpore is hetero-disperse. (Le=L) ranged from 2.9 to 5.9, compared to 1.4 for a monodisperse and uniform distribution of pore sizes. The ðLe=LÞ-φt relationship and probability density function (pdf) of (Le=L) were Gaussian. Beyond the common index of φt, these parameters are building blocks for infiltration, filtration, evaporation, storage, and reaction components of models such as the storm water management model (SWMM) and computationalfluid Dynamics (CFD
An Investigation in Applying Image Retrieval Techniques to X-Ray Engineering Pictures
No full textUsing image retrieval techniques in analysing Non-destructive testing reults is a new challenge in both
computing science and engineering applications. Objective of this research is to develop an image retrieval system
to analyse X-ray images for welding industry. The content based image retrieval has been used in this investigation,
particularly in feature vector paradigm and similarity as well as detailed analysis towards single defects. It is found
that X-ray images can be digitally analysed qualitatively and quantitatively easily. It concludes that the use of
existing CBIR techniques can provide a platform to quickly develop new image analysis tools
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
Epigenetic Profiling of Hepatocarcinogenesis Using ChIP-seq: Focus on HBV X Protein (HBx)-induced H3K27 Trimethylation in a Transgenic HCC Model
No full textLee, Ying Ying.Thesis M.Phil. Chinese University of Hong Kong 2016.Includes bibliographical references (leaves ).Abstracts also in Chinese.Title from PDF title page (viewed on …)
Time-lapse helical X-ray computed tomography (CT) data of tensile fatigue damage in GFRP
No full textThe X-ray CT data here is published with the paper -
Wang, Y.; Mikkelsen, L.P.; Pyka, G.; Withers, P.J. Time-Lapse Helical X-ray Computed Tomography (CT) Study of Tensile Fatigue Damage Formation in Composites for Wind Turbine Blades. Materials 2018, 11, 2340.
https://doi.org/10.3390/ma11112340
More information about the data and the material can be found in the paper above.
If using the data here, please cite the above paper.
Contact details for author: Ying Wang, [email protected]</p
Pore-structure models of hydraulic conductivity for permeable pavement
No full textPermeable pavement functions as a porous infrastructure interface allowing the infiltration and evaporation
of rainfall–runoff while functioning as a relatively smooth load-bearing surface for vehicular transport.
Hydraulic conductivity (k) of permeable pavement is an important hydraulic property and is a
function of the pore structure. This study examines k for a cementitious permeable pavement (CPP)
through a series of pore-structure models. Measurements utilized include hydraulic head as well as total
porosity, (/t), effective porosity (/e), tortuosity (Le/L) and pore size distribution (PSD) indices generated
through X-ray tomography (XRT). XRT results indicate that the permeable pavement pore matrix is hetero-
disperse, with high tortuosity and /t – /e. Power law models of k–/t and k–/e relationships are
developed for a CPP mix design. Results indicate that the Krüger, Fair-Hatch, Hazen, Slichter, Beyer
and Terzaghi models based on simple pore-structure indices do not reproduce measured k values. The
conventional Kozeny–Carman model (KCM), a more parameterized pore-structure model, did not reproduce
measured k values. This study proposes a modified KCM utilizing /e, specific surface area (SSA)pe
and weighted tortuosity (Le/L)w. Results demonstrate that such permeable pavement pore-structure
parameters with the modified KCM can predict k. The k results are combined with continuous simulation
modeling using historical rainfall to provide nomographs examining permeable pavement as a low
impact development (LID) infrastructure componen
FIGURE 4. Carex fangiana X. F. Jin & Y. Y in Notes on Carex (Cyperaceae) from China: three new species
No full textFIGURE 4. Carex fangiana X. F. Jin & Y. Y. Zhou, sp. nov. (A) habit; (B) staminate scale; (C) pistillate scale; (D) perigynium; (E) achene (drawn by Xiao-Feng Jin from holotype in SZ).Published as part of Zhou, Ying-Ying & Jin, Xiao-Feng, 2014, Notes on Carex (Cyperaceae) from China: three new species, pp. 133-140 in Phytotaxa 164 (2) on page 138, DOI: 10.11646/phytotaxa.164.2.7, http://zenodo.org/record/513266
FIGURE 3. Carex daxinensis Y. Y. Zhou & X. F in Notes on Carex (Cyperaceae) from China: three new species
No full textFIGURE 3. Carex daxinensis Y. Y. Zhou & X. F. Jin, sp. nov. (A) habit; (B) staminate scale; (C) pistillate scale; (D) perigynium; (E) achene (drawn by Xiao-Feng Jin from holotype in HTC).Published as part of Zhou, Ying-Ying & Jin, Xiao-Feng, 2014, Notes on Carex (Cyperaceae) from China: three new species, pp. 133-140 in Phytotaxa 164 (2) on page 136, DOI: 10.11646/phytotaxa.164.2.7, http://zenodo.org/record/513266
Damage Detection of Concrete Beams Using Nonlinear Features of Forced Vibration
No full textA new indicator is proposed to facilitate the detection of newly induced damage in reinforced concrete (RC) beams, based on the transient characteristics of nonlinear vibration. Two full-scale RC beams, one reinforced with externally bonded fiber-reinforced-polymer sheets, are tested to develop the proposed damage indicator. Both beams are statically and dynamically loaded to correlate the dynamic characteristics of the beams to the damage level. a phenomenological model is developed to simulate the general behavior of cracked concrete members with a softening Duffing oscillator. Numerical results and test data show that the indicator rapidly increases with the severity of damage and is very sensitive to cracking even under service loads. the indicator is directly related to the transient features along crack surfaces and requires no baseline in practical applications. Experimental test results also show that the fundamental natural frequency of the strengthened beam suddenly decreases at the initiation of cracking and then remains nearly constant while natural frequency of the unstrengthened beam decreases continuously as the beam experiences concrete cracking and reinforcement yielding
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