3,231 research outputs found
Skin-Stiffener Separation in T-Stiffened Composite Specimens in Postbuckling Condition
No full textAn experimental and numerical investigation was conducted to study the skin-stiffener separation of single T-shape stiffener specimens in postbuckling condition. Three specimens were manufactured with a centrally located Teflon insert, and were loaded in compression until collapse. Deformation patterns and separation evolution were monitored during the tests. To measure the full-field displacements and the strain distributions of the specimens, a digital image correlation (DIC) system was used. Skin-stiffener separation was observed and measured with an ultrasound system. Finite-element (FE) analyses were conducted to capture interlaminar damage mechanism based on the virtual crack closure technique. The numerical analysis accurately predicted the postbuckling deformation and the skin-stiffener separation behavior. The close correlation between the experimental and numerical results allows for further exploitation of the strength reserve in the postbuckling region and wider design options for the next generation of composite aircraft designs.</p
Differential Phosphorylation of Smad1 Integrates BMP and Neurotrophin Pathways through Erk/Dusp in Axon Development
No full textSummarySensory axon development requires concerted actions of growth factors for the precise control of axonal outgrowth and target innervation. How developing sensory neurons integrate different cues is poorly understood. We demonstrate here that Smad1 activation is required for neurotrophin-mediated sensory axon growth in vitro and in vivo. Through differential phosphorylation, Smad1 exerts transcriptional selectivity to regulate the expression and activity of Erk1 and Erk2—two key neurotrophin effectors. Specifically, bone morphogenetic proteins (BMPs) signal through carboxy-terminal phosphorylation of Smad1 (pSmad1C) to induce Erk1/2 transcription for enhanced neurotrophin responsiveness. Meanwhile, neurotrophin signaling results in linker phosphorylation of Smad1 (pSmad1L), which in turn upregulates an Erk-specific dual-specificity phosphatase, Dusp6, leading to reduced pErk1/2 and constituting a negative-feedback loop for the prevention of axon overgrowth. Together, the BMP and neurotrophin pathways form a tightly regulated signaling network with a balanced ratio of Erk1/2 and pErk1/2 to direct the precise connections between sensory neurons and peripheral targets
Finite Element Methods and Their Convergence for Elliptic and Parabolic Interface Problems
No full textIn this paper, we consider the finite element methods for solving second order elliptic and parabolic interface problems in two-dimensional convex polygonal domains. Nearly the same optimal L 2 -norm and energy-norm error estimates as for regular problems are obtained when the interfaces are of arbitrary shape but are smooth, though the regularities of the solutions are low on the whole domain. The assumptions on the finite element triangulation are reasonable and practical. Mathematics Subject Classification (1991): 65N30, 65F10. A running title: Finite element methods for interface problems. Correspondence to: Dr. Jun Zou Email: [email protected] Fax: (852) 2603 5154 1 Institute of Mathematics, Academia Sinica, Beijing 100080, P.R. China. Email: [email protected]. The work of this author was partially supported by China National Natural Science Foundation. 2 Department of Mathematics, the Chinese University of Hong Kong, Shatin, N.T., Hong Kong. E-mail: [email protected]...
Hoe zou een publieke datadonatiepraktijk ten behoeve van gezondheid en welzijn eruit kunnen zien?
No full textDit boekje is verslag van het CHANGE! (Conscious Health dAta shariNg in movinG RottErdam!) project dat is uitgevoerd in 2021-22 in het kader van een Open Mind subsidie van het Convergence programma dat ten doel heeft samenwerking tussen TU Delft, Erasmus Universiteit Rotterdam en Erasmus Medisch Centrum te bespoedigen. Het stimuleert allianties van onderzoekers van de verschillende universiteiten om in samenwerking met publieke en private partners innovatieve bijdragen te leveren aan urgente en complexe maatschappelijke uitdagingen, zoals klimaatverandering, duurzaamheid, gezondheidszorg, verstedelijking en digitalisering.Dit (kleine, verkennende) interdisciplinaire project, uitgevoerd binnen het Health & Technology programma, betreft een onderzoek naar hoe een publieke datadonatiepraktijk ten behoeve van gezondheid en welzijn eruit zou kunnen zien. Het is een ultiem Convergence-project, omdat het grensoverschrijdend is voor elk van de participerende instituten en kennisdomeinen en expertise van het team. Binnen CHANGE! zijn onder andere de medische, ethische, sociaal-maatschappelijke, politieke en ruimtelijke (en niet strikt de technische) aspecten van het verzamelen en werken met gezondheidsdata verkend.Design Aesthetic
Self-assembled photonic mesostructures for water splitting photoanodes
No full textSolar water splitting is a relevant principle for the production of green hydrogen fuel. A wealth of different designs has been envisioned to produce hydrogen using sunlight. Among those designs photoelectrochemical water splitting offers possible advantages regarding components integration and costs. This technology requires blending many materials requirements in a single component, such as solar light absorption, high electric conductivity, resistance to photocorrosion, and electrocatalytic properties. To achieve this goal it is necessary to build materials with emerging properties by discovering complex architectures at the micrometric and nanometric scales that can overcome bulk material limitations.
Materials of interest for application as photoanode for photoelectrochemical water splitting are metal oxides because of their resistance to corrosion. In this thesis I focused on two of these oxides, namely hematite (alpha-Fe2O3) and monoclinic tungsten oxide (mWO3) since these materials have a relatively narrow band gap allowing absorption of a significant part of sun's irradiance. In a photoanode they were implemented as thin films on a conductive substrate. I proposed to investigate inexpensive and upscalable structuration processes for the formation of such photoanodes thin films with a controlled microstructure and studied the impact of such structures on the film photoelectrochemical performance.
Self-assembly strategies are bottom-up approaches which allow to grow structures with original morphologies at a low cost compared to top-down techniques such as lithography. I was particularly interested in strategies that would grant a fine control of the feature sizes. Two different processing techniques were implemented, a polymer templated sol-gel route and electrohydrodynamic lithography. Both techniques allowed to obtain metal oxides structures at the meso- to nanoscale. The polymer templated sol-gel route was the most successful strategy. It allowed to produce microspheroids with a tungsten oxide core and a hematite nanometric overlayer with control on the structure dimensions.
In addition to an in depth understanding of the different bottom-up approaches investigated, I proposed a complete description of the relationship between form and function in the film composed of tungsten oxide / hematite microspheroids. These films have significant photonic features linked to their original morphology and I discussed how their photoactivity is influenced by light trapping in these films
Wanted! Investigating how elements from the personal usage context affect Gen Z consumers' value-in-use experience and engagement with mobile service
No full textsponsorship: The research underlying this article has benefitted from a China Scholarship Council grant (No. 201508320285) to the first author. (China Scholarship Council|201508320285)status: Publishe
A contextual classification approach for forest land cover mapping using high spatial resolution multispectral satellite imagery – a case study in Lake Tahoe, California
No full textMaps of classified surface features are a key output from remote sensing. Conventional methods of pixel-based classification label each pixel independently by considering only a pixel’s spectral properties. While these purely spectral-based techniques may be applicable to many medium and coarse-scale remote sensing analyses, they may become less accurate when applied to high spatial resolution imagery in which the pixels are smaller than the objects to be classified. At this scale, there is a higher intra-class spectral heterogeneity. Detailed forest and vegetation classification is extremely challenging at this scale with both high intra-class spectral heterogeneity and inter-class spectral homogeneity. A solution to these issues is to take into account not only a pixel’s spectral characteristics but also its spatial characteristics into classification. In this study, we develop a generalizable contextualized classification approach for high spatial resolution image classification. We apply the proposed approach to map vegetation growth forms such as trees, shrubs, and herbs in a forested ecosystem in the Sierra Nevada Mountains.Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01The student, Yi Zou, accepted the attached license on 2015-07-17 at 13:20.The student, Yi Zou, submitted this Thesis for approval on 2015-07-17 at 13:27.This Thesis was approved for publication on 2015-07-20 at 13:48.DSpace SAF Submission Ingestion Package generated from Vireo submission #8535 on 2015-09-29 at 15:00:47Made available in DSpace on 2015-09-29T20:50:19Z (GMT). No. of bitstreams: 2
ZOU-THESIS-2015.pdf: 1902672 bytes, checksum: 2bff06232b51ac5c88d30798b7e03748 (MD5)
LICENSE.txt: 4203 bytes, checksum: 0947552377d2579fbba125e391804356 (MD5)
Previous issue date: 2015-07-20Embargo set by: Seth Robbins for item 89495
Lift date: 2017-09-29T20:50:34Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 89495 on 2017-09-30T09:15:30Z
Goniocotes rolandi Gustafsson & Tian & Zou 2021, new species
No full textGoniocotes rolandi new species (Figs 10–11, 13–15) Type host: Crossoptilon harmani Elwes, 1881 —Tibetan eared pheasant (Phasianidae). Type locality: Southeast Tibet, China. Diagnosis. Goniocotes rolandi new species is most similar to Goniocotes crossoptiloni Liu, 1990. These two species can be separated by the following characters: male tergopleurites V–VI with 1 tps on each side and tergopleurite VII without tps in G. crossoptiloni, but tergopleurite V with 2–4 tps on each side, tergopleurite VI with 1–2 tps on each side, and tergopleurite VII with 1–2 tps on each side in G. rolandi (Fig. 10); male sternite IV–V with 2 sts on each side in G. crossoptiloni, but with 3–4 sts on each side in G. rolandi (Fig. 10); head of G. rolandi (Figs 10–11) proportionately wider and with flatter frons, especially in female, than head of G. crossoptiloni; vulval margins more or less gently rounded in G. crossoptiloni, but with pronounced median bulge in G. rolandi (Fig. 13); male genitalia not illustrated in sufficient detail for G. crossoptiloni, but appear to have shorter parameres and broader mesosome than those of G. rolandi (Figs 14–15). Description. Both sexes. Head shape as in Fig. 10; temples flaring with definite postero-lateral corner at aperture of mts1. Marginal carina of moderate width, widening anteriorly (more obvious in male). Head chaetotaxy as in Figs 10–11; os sexually dimorphic; s1–2 and s5–9 present, as well as one sensillum situated roughly on a line between pts and pns, which may be either of s3–4. Thoracic and abdominal segments as in Figs 10–11. Reticulation covers almost all of tergal and subgenital plates, but is less distinct elsewhere. For clarity, we have here illustrated only parts of this reticulation in grey, to indicate the relative size of the cells in the pattern. Measurements as in Table 1. Male. Ocular seta macroseta (Fig. 10). Thoracic and abdominal chaetotaxy as in Fig. 10; median section of pteronotum with one macroseta and one microseta on each side; tergopleurites II–IV with setal rows; tergopleurite V with 2–4 tps on each side; tergopleurite VI with 1–2 tps on each side (one specimen with no tps on one side); tergopleurite VII with one tps on each side. Basal apodeme long and slender (Figs 14–15). Mesosome present, roughly triangular dorsally (Fig. 14), but ventrally with distinct hook-shaped lateral extensions at about mid-length. One small sensillum on each side near the dorsal anterior margin; no other sensilla or setae visible. Postero-lateral corners of basal apodeme with rugose nodi; parameres slender and somewhat elongated. Female. Ocular seta microseta (Fig. 11). Thoracic and abdominal segments and chaetotaxy as in Fig. 11. Vulval margin with distinct median bulge and lateral sections deeply concave (Fig. 13). Vulval chaetotaxy: 41–48 long, slender vms (often in double rows at least laterally) and 2–3 large, thorn-like vss on each side; oblique set with 5–8 vos of varying length on each side, typically with distal setae longer than more proximal setae. Etymology: The specific epithet is in honour of the first author’s father, Roland Gustafsson, who spent many weekends taking him outdoors to watch birds, to camp, to enjoy nature, and introducing him to his first bird-ringing event outside Jönköping, Sweden, in the early 1990s. This laid the foundations of a solid interest in nature for the first author, who eventually devoted his life to biological research. Type material. Ex Crossoptilon harmani: Holotype ♂, S.E. Tibet [China], May 1912, R. Meinertzhagen, ID 3759, NHMUK010675935 [right-most male on slide, marked with black dot] (NHMUK). Paratypes. 3♂, 6♀, same data as holotype, NHMUK010675934–5 (NHMUK).Published as part of Gustafsson, Daniel R., Tian, Chunpo & Zou, Fasheng, 2021, New species of ischnoceran chewing lice (Phthiraptera: Philopteridae) from Chinese birds, pp. 305-328 in Zootaxa 4990 (2) on pages 310-317, DOI: 10.11646/zootaxa.4990.2.6, http://zenodo.org/record/502655
- …
