2,592 research outputs found
Curating New Narratives interviews Ute Meta Bauer
No full textIn this interview, Ute Meta Bauer discusses her history as a curator and several of her major projects, “section ?” in NowHere (Humlebeck, Louisiana Museum of Modern Art, 1996); Architectures of Discourse (Barcelona: Fundació Antoni Tapies, 2001); and First Story – Women Building/ New Narratives for the 21st Century (Porto: Galeria de Palácio/ Biblioteca Municipal Almeida Garrett, 2001). Ute Meta Bauer is one of the co-curators for Documenta X1, and was Artistic Director of Kunstlerhaus, Stuttgart, 1990-1994, where she produced the journal Meta, 1992-1994. Since 1996, she has been Professor for Theory, Practice and Mediation of Contemporary Art at the Academy of Fine Arts Vienna/ Akademie der bildende Künste Wien and in 2002 she became director of the newly established institution NOCA in Oslo
[[alternative]]The KT transition of YBCO films
No full text[[abstract]]我們想藉由觀察 YBaCuO 薄膜是否有 KT 變遷的現象,來瞭解薄膜厚度與
維度的關係。故我們製作二塊不同厚度 (240o,120o) 的薄膜,分別量測它
們的電阻率與 V-I 曲線, 並加以分析。其中240o 之 YBCO 薄膜由於厚度
較大,無法表現二維的行為。而120o 的薄膜其 V-I 曲線相關的次方定律
V=I,在 T<76.6K 時, n 滿足二維 Ginzberg- Landau 之線性關係式: n(
T)≒1+const(1-T/Tco)。以此直線與 n=1 之交點定出樣品的 T=79K。而
在n(T)約為5.1時, n 不再隨上述的線性關係式隨溫度下降,亦即發生了
KT 變遷中普遍躍遷的現象。我們分別以 n=3及 n=5.1 定出兩種不同的
Tkt, 來討論電阻率的結果。由電阻率的結果分析,無論那種決定 Tkt 的
方法在介於78.1及78.6K 間,其ln(R/Rn)與[(Tco-T)/(T-Tkt)]成線性關係
。亦就是出現 KT 理論中預測因二維渦流運動產生的特殊行為。所以其具
有二維的傳導現象。
In order to know the dimensionalities of YBCO films, we
measured the resistivities and I-V curves of two YBCO films(120
o,240o). According to our results,the film of 240o thickness
couldn't show the 2d behaviors.The power law of 120o film has
the universal jump phenomena and the resisti- vity behavior can
be explained by 2d free vortices mo- tion.We can say that the
YBCO film of 120o thickness is a 2d system.
In order to know the dimensionalities of YBCO films, we
Numerical analysis and discussion on the hot-spot stress concept applied to welded tubular KT joints
No full textNominal stresses have been used for a long time for the assessment of fatigue resistance of welded joints, however, this approach has strong limitations since the definition of the nominal stress may be subjective for complex welded details and/or complex loading. On the other hand, the hot-spot stress approach has been proposed to overcome these limitations considering the structural geometrical discontinuities. However, the hot-spot stress methods also present certain limitations, and the present study aims at evaluating the available numerical and analytical hot-spot stress methods proposed by DNVGL (2016) and IIW (2014). The particular case of an offshore tubular KT joint has been considered herein and discretized in two planes. It has been studied numerically using the ABAQUS software coupled with the hot-spot stress extrapolation methods described in IIW (2014) and DNVGL (2016). The influence of the weld geometry has been considered and evaluated. In addition to the numerical method, the present study has also considered the analytical approach proposed in DNVGL (2016) derived from the combination of Efthymiou solutions for the stress concentration factor with the method of superposition of stresses. The numerical models according to IIW (2014) have been found to be more conservative when compared with the mesh-size methods proposed by DNVGL (2016), both in numerical modelling without the weld or with weld. For the numerical models with weld cord, the mean values of normalized difference index obtained for all braces together, as a result of comparing numerical results with analytical solutions, are lower, when compared with results obtained from the numerical models without weld cord.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Steel & Composite Structure
Effect of Stress Ratio(R) and Stress Concentration Factor (Kt) on Fatigue Properties of WSTi6211 Titanium Alloy
No full textIn this paper, the author studied the effects of different stress ratios（R） and stress concentration factors(Kt) on the fatigue properties of WSTi6211 titanium alloy.Through S-N curve, the author obtained the fatigue ultimate strength of the material under different conditions and analyzed characteristics of fatigue fractures, including the crack source sourse, the crack growth region and the final rupture region. The results show that when Kt=1, R=0.5, the fatigue ultimate strength σD is 626MPa; when Kt = 1, R=0.06, the fatigue ultimate strength σD is 527.5MPa; when Kt=3, R=0.06, the ultimate fatigue strength σD is 267MPa. Fatigue performance is very sensitive to R and Kt. The larger R is, the larger the fatigue ultimate strength is. The larger Kt is, the smaller the fatigue limit strength is. The fracture morphology shows typical fatigue fracture morphology. Most of the cracks originate on the surface of specimens and have typical fatigue bands. With the decrease of stress, the area of crack growth zone increases
Effect of Stress Ratio(R) and Stress Concentration Factor (Kt) on Fatigue Properties of WSTi6211 Titanium Alloy
No full textIn this paper, the author studied the effects of different stress ratios（R） and stress concentration factors(Kt) on the fatigue properties of WSTi6211 titanium alloy.Through S-N curve, the author obtained the fatigue ultimate strength of the material under different conditions and analyzed characteristics of fatigue fractures, including the crack source sourse, the crack growth region and the final rupture region. The results show that when Kt=1, R=0.5, the fatigue ultimate strength σD is 626MPa; when Kt = 1, R=0.06, the fatigue ultimate strength σD is 527.5MPa; when Kt=3, R=0.06, the ultimate fatigue strength σD is 267MPa. Fatigue performance is very sensitive to R and Kt. The larger R is, the larger the fatigue ultimate strength is. The larger Kt is, the smaller the fatigue limit strength is. The fracture morphology shows typical fatigue fracture morphology. Most of the cracks originate on the surface of specimens and have typical fatigue bands. With the decrease of stress, the area of crack growth zone increases
Afroedura leoloensis Jacobsen, Kuhn, Jackman & Bauer, 2014, sp. nov.
No full textAfroedura leoloensis sp. nov. (Fig. 10 B) Afroedura pondolia langi (part) Visser 1984 a (fig. p. 61) Afroedura langi 'Leolo' Jacobsen 1992 a, 1997 Holotype. TM 81113, adult male, Farm Hendriksplaats 281 KT, 24 ° 38 ' S, 30 °08' E, Lydenburg District, (2430 CA) Mpumalanga Province, Republic of South Africa, collectors R. E. Newbery and W. Petersen, 15 November 1985. Paratypes. TM 81115, TM 81125, 81127, same data as for holotype; TM 81119, 81124, Farm Maandagshoek 254 KT, Sekhukhuneland District, Limpopo Province (2430 CA) collector N. H. G. Jacobsen, 25 October 1980; TM 81112, 81116– 81118, same locality as TM 81119, collector R.E.Newbery, 29 June 1982; TM 81126, Farm Kalkfontein 367 KT, Lydenburg District, Mpumalanga Provicne (2430 CC), collector N. H. G. Jacobsen, 23 April 1981; TM 81114, 81121, 81123, 81128, same locality as TM 81126, collectors R. E. Newbery and W. Petersen, 16 November 1985; TM 81122, Kgoloko lokasie, Sekhukhuneland District, Limpopo Province (2429 DB), collector R. E. Newbery, 27 October 1980; TM 81120, Farm De Grooteboom 373 KT, Lydenburg District, Mpumalanga Province (2430 CC), collector N. H. G. Jacobsen, 23 October 1981. Etymology. The specific epithet refers to the Leolo hills in Sekhukhuneland, Limpopo Province, where it was first discovered. Diagnosis. A small Afroedura (maximum SVL 40.5 mm) differing from all other congeners by the following combination of characters: two pairs of enlarged subdigital lamellae per digit; tail faintly verticillate and flattened near base, with four subcaudal rows and 6–7 supracaudal rows per verticil; dorsal scales smooth, 87–95 scale rows at midbody; internasal scales typically absent; 31–35 precloacal pores in males. Description. (based on holotype TM 81113) Adult male; 37.0 mm SVL; 45.0 mm TailL; mass before preservation 0.9 g. Body small and slender, dorsoventrally depressed; head oval, wider than the neck. Rostral approximately 2.5 times wider than high; nostril pierced between rostral, first upper labial and three nasal scales; nasorostrals in moderate contact behind rostral. Scales on snout hexagonal, flattened and much larger than scales on crown of head; nine scales between nasals and eye and 16 scales between eye and ear. Four supraciliary spines. Supralabials 10. Mental wedge-shaped, much longer than wide and in contact with two postmentals. Infralabials eight. Dorsal scales minute, more-or-less homogeneous, smooth, juxtaposed to subimbricate, rounded to slightly hexagonal. Midbody scales 89. Ventrals large, smooth and imbricate. Digits with two pairs of enlarged scansors and six enlarged inferomedian scales under the fourth toe. Precloacal pores in a continuous, almost straight row of 34. Tail broad and flattened near the base, tapering to a fine tip, faintly verticillate; caudal scales arranged in six dorsal and four ventral rows per verticil. Supracaudals subimbricate, almost rectangular; subcaudals as broad as long and imbricate. Two postcloacal spurs on either side of tail base. Color. Pale brown to brown dorsally with 7–8 dark brown irregular crossbands extending from the occiput to sacrum. Crossbands with darker posterior margins and, in most specimens, a white vertebral spot just posterior to each crossband. Limbs longitudinally striped or banded. The paler areas between the stripes are spotted dark brown. Crown of head pale brown with darker spotting and other variegations. Tail with 10 blackish crossbands from base to tip. Venter pinkish; tail brownish with darker markings. Variation. Paratypes and other specimens agree with the holotype in most features of scalation (Table 4). Nasorostrals in broad contact behind rostral but separated posteriorly by a single granule in TM 81120. Scales between nasals and eye 9–12, from eye to ear 16–18. Five supraciliary spines in TM 81115. Mental as long as broad in some specimens; postmentals three in TM 811141. Supralabials 8–10. Infralabials 6–10. Midbody scale rows 87–95. 0–8 enlarged inferomedian scales under fourth toe. Precloacal pores in male paratypes 31–35 (except for TM 81126, which has only 11), females lacking pores. Original tails 50.00– 55.9 % of total length. Supracaudal scales in 6 or 7 rows per tail whorl. Tail has been autotomized in 54.5 % of the specimens examined (n= 17). Distribution. Endemic to the Leolo Hills and outcrops above the Steelpoort River on either side of the border between Mpumalanga and Limpopo Provinces (Fig. 6). Natural history. Exclusively rupicolous, apparently limited to norite and granitic formations. Afroedura leoloensis sp. nov. lives in narrow crevices under exfoliating rock. These are usually on the underside of boulders with the openings facing downwards, protecting them from rain. The species is found in Sekhukhune Mountain Bushveld (SVcb 28) and Leolo Summit Sourveld (GM 20) (Mucina & Rutherford 2006) at an elevation of 1200–1800 m a.s.l. Two eggs are laid at a time and measure 8.9 –9.0 x 6.1–6.4 mm with a mass of 0.2 g. The eggs appear to be laid in midsummer and are initially soft-shelled, adhering to the rock and then hardening. Remarks. Afroedura leoloensis sp. nov. is a member of the A. langi clade (Figs. 1–2; see Remarks under A. granitica sp. nov.). This species exhibits the highest number of precloacal pores (31–35) not only in its clade, but in the genus as a whole, and may thus be distinguished from its congeners.Published as part of Jacobsen, Niels H. G., Kuhn, Arianna L., Jackman, Todd R. & Bauer, Aaron M., 2014, A phylogenetic analysis of the southern African gecko genus Afroedura Loveridge (Squamata: Gekkonidae), with the description of nine new species from Limpopo and Mpumalanga provinces of South Africa, pp. 451-501 in Zootaxa 3846 (4) on pages 486-487, DOI: 10.11646/zootaxa.3846.4.1, http://zenodo.org/record/25049
Morphological brain differences between adult stutterers and non-stutterers
No full textBACKGROUND: The neurophysiological and neuroanatomical foundations of persistent developmental stuttering (PDS) are still a matter of dispute. A main argument is that stutterers show atypical anatomical asymmetries of speech-relevant brain areas, which possibly affect speech fluency. The major aim of this study was to determine whether adults with PDS have anomalous anatomy in cortical speech-language areas. METHODS: Adults with PDS (n = 10) and controls (n = 10) matched for age, sex, hand preference, and education were studied using high-resolution MRI scans. Using a new variant of the voxel-based morphometry technique (augmented VBM) the brains of stutterers and non-stutterers were compared with respect to white matter (WM) and grey matter (GM) differences. RESULTS: We found increased WM volumes in a right-hemispheric network comprising the superior temporal gyrus (including the planum temporale), the inferior frontal gyrus (including the pars triangularis), the precentral gyrus in the vicinity of the face and mouth representation, and the anterior middle frontal gyrus. In addition, we detected a leftward WM asymmetry in the auditory cortex in non-stutterers, while stutterers showed symmetric WM volumes. CONCLUSIONS: These results provide strong evidence that adults with PDS have anomalous anatomy not only in perisylvian speech and language areas but also in prefrontal and sensorimotor areas. Whether this atypical asymmetry of WM is the cause or the consequence of stuttering is still an unanswered question
BARYON MAGNETIC-MOMENTS WITH CONFINED QUARKS
No full textAstronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)0ARTICLE3920-9234
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