1,504,169 research outputs found
Phillip Lai monograph (2022)
No full textThis first monograph on Phillip Lai (b.1969, Kuala Lumpur, Malaysia) charts the artist’s sculptural development over the course of the last two decades. From a basement soy-sauce factory to the Hepworth Prize for Sculpture, the publication surveys several of the artist’s exhibitions across London, Wakefield, Turin, Berlin and Hong Kong. The nine chapters explore an evolving oeuvre that finds form in materials like aluminium, pewter, concrete, resin, rice, cooking pots, textiles and film. It is through these technologies that Lai broaches the material limits of the everyday world, often working with casting processes that see the abstraction and changing stability of materials as they transition from fluid to solid. What comes into focus is a fascination with how objects can relieve or modulate primal human urges to food and water and how, by extension, a material world might be re-envisioned around concerns of depletion and survival. This publication includes an essay by critic and writer Jan Verwoert, with bilingual text in English and Chinese throughout
Estimation of leaf area index from PROBA/CHRIS hyperspectral multi-angular data
No full textLeaf Area Index (LAI) is a key structural and functional biophysical variable of the vegetated surfaces which is important in quantifying evapotranspiration rates and the energy exchange of terrestrial vegetation. Remote sensing offers a method of providing estimates of LAI through the analysis of the Bidirectional Reflectance Distribution Function (BRDF), an angular-dependent surface response. High-resolution, multi-angular and hyperspectral image data from PROBA/CHRIS (Project On-Board Autonomy/ Compact High Resolution Imaging Spectrometer) are used to estimate LAI. The retrieval of LAI is accomplished using the 1D turbid-medium canopy reflectance model, SAIL, coupled with the leaf reflectance model, PROSPECT REDUX. Look-up-tables are generated using scene-specific parameters required to invert the physically based model. Two experiments are performed to examine the contribution of multispectral versus hyperspectral reflectances (nadir direction) and single-look versus multi-look hyperspectral reflectances in deriving the LAI. Image data of the calibration/validation site at Chilbolton, Hampshire, UK are used for the inversion. In addition, ground measurements of LAI are compared with the retrieved LAI estimates. Retrieved LAI estimates using various spectral and directional sampling suggest that the spectro-directional reflectances from CHRIS provides more accurate results than their lower-resolution counterparts such as single-look and multispectral reflectances
The theory and practice of utopia in our troubled times : a conversation with author Larissa Lai and critic Sherryl Vint
No full textAmid current global crises, the international conference “The Knock at the Door: Utopian Dreams for Post-Covid Times,” jointly organized by the University of Huelva (Spain) and the University of Calgary (Canada) on May 21–24, 2023, at the University of Huelva, provided a forum for reflecting upon the role played by speculative fiction in (re)imagining better futures, while remaining vigilant to possible threats and dangers. The title of the conference, borrowed from philosopher John Rajchman,1 is intentionally ambiguous. Lying behind that door could be total liberation for all—or it could be secret police who lead us toward genocides, deportation, rapes, and mass graves. Taking this dichotomous trope, “the knock at the door,” as a point of departure, professors Larissa Lai (University of Toronto, Canada; recipient of a Maria Zambrano fellowship at the University of Huelva at the time of the interview) and Sherryl Vint (University of California Riverside, USA) engaged...Depto. de Estudios Ingleses: Lingüística y LiteraturaFac. de Ciencias Económicas y EmpresarialesTRUEpu
A physically based approach to model LAI from MODIS 250 m data in a tropical region
No full textA time series of leaf area index (LAI) has been developed based on 16-day normalized difference vegetation index (NDVI) data from the Moderate Resolution Imaging Spectroradiometer (MODIS) at 250 m resolution (MOD250_LAI). The MOD250_LAI product uses a physical radiative transfer model which establishes a relationship between LAI, fraction of vegetation cover (FVC) and given patterns of surface reflectance, view-illumination conditions and optical properties of vegetation. In situ measurements of LAI and FVC made at 166 plots using hemispherical photography served for calibration of model parameters and validation of modelling results. Optical properties of vegetation cover, summarized by the light extinction coefficient, were computed at the local (pixel) level based on empirical models between ground-measured tree crown architecture at 85 sampling plots and spectral values in Landsat ETM+ bands. Influence of view-illumination conditions on optical properties of canopy was simulated by a view angle geometry model incorporating the solar zenith angle and the sensor viewing angle. The results revealed high compatibility of the produced MOD250-LAI data set with ground truth information and the 30 m resolution Landsat ETM+ LAI estimated using the similar algorithm. The produced MOD250_LAI was also compared with the global MODIS 1000-m LAI product (MOD15A2 LAI). Results show good consistency of the spatial distribution and temporal dynamics between the two LAI products. However, the results also showed that the annual LAI amplitude by the MODI 5A2 product is significantly higher than by the MOD250_LAI. This higher amplitude is caused by a considerable underestimation of the tropical rainforest LAI by the MOD15A2 during the seasonal phases of low leaf production. (C) 2009 Elsevier B.V. All rights reserved.German Research Foundation (DFG
A Conversation with Jimenez Lai
No full textJimenez Lai works in the world of art, culture, and education. Lai’s Master of Architecture thesis was a science fiction about a post-teleportation world. Previously, Jimenez Lai lived in a desert shelter at Taliesin and resided in a shipping container at Atelier Van Lieshout on the piers of Rotterdam. Before founding Bureau Spectacular, Lai worked for various international offices, including MOS and OMA. Lai is widely exhibited and published around the world, including the MoMA-collected White Elephant. His first book, Citizens of No Place, was published by Princeton Architectural Press with a grant from the Graham Foundation. Draft II of this book has been archived at the New Museum. Lai has won various awards, including the Architectural League Prize for Young Architects and Debut Award at the Lisbon Triennale, and the 2017 Designer of the Future Award at Art Basel / Design Miami. In 2014, Lai represented Taiwan at the 14th Venice Architecture Biennale. In 2015, Lai organized the Treatise exhibition and publication series at the Graham Foundation. Lai’s work is in the permanent collection of MoMA, SFMOMA, Art Institute of Chicago, and LACMA. Jimenez Lai was the 2024 Gwathmey Chair at Cooper Union
Supplemental material for publication JAAD-D-19-02389 (Chun-Yu Lai et al. Association between bullous pemphigoid and ischemic heart diseases: A systematic review and meta-analysis. J Am Acad Dermatol. 2020)
No full textSupplemental material for publication JAAD-D-19-02389 (Chun-Yu Lai et al. Association between bullous pemphigoid and ischemic heart diseases: A systematic review and meta-analysis. J Am Acad Dermatol. 2020
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems
No full textAuthor Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 1462–1470, doi:10.1890/03-5354.Leaf area index (LAI) is a powerful diagnostic of plant productivity. Despite the fact that many methods have been developed to quantify LAI, both directly and indirectly, leaf area index remains difficult to quantify accurately, owing to large spatial and temporal variability. The gap-fraction technique is widely used to estimate the LAI indirectly. However, for low-stature vegetation, the gap-fraction sensor either cannot get totally underneath the plant canopy, thereby missing part of the leaf area present, or is too close to the individual leaves of the canopy, which leads to a large distortion of the LAI estimate. We set out to develop a methodology for easy and accurate nondestructive assessment of the variability of LAI in low-stature vegetation. We developed and tested the methodology in an arctic landscape close to Abisko, Sweden.
The LAI of arctic vegetation could be estimated accurately and rapidly by combining field measurements of canopy reflectance (NDVI) and light penetration through the canopy (gap-fraction analysis using a LI-COR LAI-2000). By combining the two methodologies, the limitations of each could be circumvented, and a significantly increased accuracy of the LAI estimates was obtained. The combination of an NDVI sensor for sparser vegetation and a LAI-2000 for denser vegetation could explain 81% of the variance of LAI measured by destructive harvest. We used the method to quantify the spatial variability and the associated uncertainty of leaf area index in a small catchment area.This research was funded by U.S. National Science Foundation
grant DEB0087046
Pseudorandomness Analysis of the Lai-Massey Scheme
No full textAt Asiacrypt’99, Vaudenay modified the structure in the IDEA cipher to a new scheme, which they called as the Lai-Massey scheme. It is proved that 3-round Lai-Massey scheme is sufficient for pseudorandomness and 4-round Lai-Massey scheme is sufficient for strong pseudorandomness. But the author didn’t point out whether three rounds and four rounds are necessary for the pseudorandomness and strong pseudorandomness of the Lai-Massey Scheme. In this paper we find a two round pseudorandomness distinguisher and a three-round strong pseudorandomness distinguisher, thus prove that three rounds is necessary for the pseudorandomness and four rounds is necessary for the strong pseudorandomness
Raggruppamento Brebo
No full textIl capitolo presenta gli elementi per condurre l'analisi strategica di un caso aziendale operante nel settore della mangimistica, prendendo in considerazione lo sviluppo multibusiness e le connesse implicazioni economico-finanziari
Author Kiese Laymon: A Reading and a Conversation (LAI)
No full textAuthor Kiese Laymon read from his memoir Heavy, followed by a conversation and audience Q&A moderated by LAI director, Matt Harkins.
Kiese Laymon is a Black southern writer from Jackson, Mississippi, who is the author of the genre-bending novel, Long Division, the essay collection, How to Slowly Kill Yourself and Others in America, and the bestselling memoir, Heavy. In Heavy, Laymon “fearlessly explores what the weight of a lifetime of secrets, lies, and deception does to a black body, a black family, and a nation teetering on the brink of moral collapse.
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