4,106 research outputs found
Local Responses to Development Pressures : Conflictual Politics of Sprawl and Environmental Conservation
There is an increasing opposition to the absorption of farmland and natural habitats by housing subdivisions and infrastructure, a symptom of urban sprawl. Through an analysis of these challenges at a regional scale, we address the contradictions and tensions in the politics of sprawl and environmental conservation. This article compares environmental conservation on the Oak Ridges Moraine in Richmond Hill and Caledon (two towns in the Greater Toronto Area) and argues that local political cultures, geography, and the density and political influence of citizens and social movements can have an impact on local responses to pressures of development. In the end, however, environmental activism in both towns is subjected to and shaped by an overall growth agenda.Lâenvahissement des terres agricoles et des milieux naturels par des lotissements et des infrastructures rĂ©sidentiels suscite de plus en plus dâopposition. Il en rĂ©sulte des tensions et des contradictions entre les pratiques dâurbanisation et les politiques de conservation de lâenvironnement. Cet article compare la gestion Ă des fins de conservation de la moraine Oak Ridges Ă Richmond Hill et Caledon (deux municipalitĂ©s de la rĂ©gion mĂ©tropolitaine de Toronto). Il est constatĂ© que la culture politique locale, la gĂ©ographie, la densitĂ© et lâinfluence politique des mouvements sociaux peuvent avoir Ă lâĂ©chelle locale un impact sur les pratiques dâurbanisation. Il reste que les mobilisations environnementales dans les deux municipalitĂ©s deviennent, malgrĂ© tout, subjugĂ©es par des objectifs de croissance
Working in a loosely coupled system: exploring practices and implications of coupling work on construction sites
The conceptualization of construction as a loosely coupled system has been widely used to explain behaviour within the industry. In this article, we revisit the concept by exploring what it means to work at the micro-level within this system. Adopting a practice lens, this study focuses on the daily work of site managers, a category of workers who often have been described to have a hub-like role in construction projects. The findings highlight how their work consists of activities that can be seen as mundane, yet simultaneously fill an important coupling function in the projects, which we conceptualize as coupling work. Coupling work denotes a managerial work practice through which site managers use slack from the parent organization to tighten site-activities. However, they do so in a particular way that tightens the projects closer to their own authority which, in turn, sustains organizational loose coupling. The study contributes to debates on change and development in construction by showing how coupling work is produced and reproduced to preserve the autonomy and control of site managers
Method for forming articles having deep drawn portions from matted wood flakes
An article having non-planar portions, such as a material handling pallet, including a substantially flat deck member and a plurality of hollow leg members projecting integrally from the deck member, is molded as a one-piece unit from a loosely-felted mat formed from a mixture of resinous particle board binder and flake-like wood particles. The leg members are preformed in a separate preform mold or the article forming mold and the mat is deposited on the female die over mold cavities containing the preforms. When the article forming mold is closed, the mat and preforms are compressed into substantially the desired shape and size under temperature and pressure conditions which bond the wood particles of the mat and the preforms together to form a unitary structure.https://digitalcommons.mtu.edu/patents/1091/thumbnail.jp
Butt Joint Reinforcement in Parallel-Laminated Veneer (PLV) Lumber
Parallel-laminated veneer (PLV) is a high-strength structural material consisting of thin parallel-laminated wood veneers. The use of graphite-cloth reinforcement, placed on either side of a butt joint in 1 1/2- by 3 1/2- by 32-inch Douglas-fir PLV tensile members, was assessed. The finite-element method of analysis was used to predict the behavior in different unreinforced and reinforced butt-jointed PLV tensile members. Relationships between the reinforcing parametersâlength, modulus of elasticity, and thicknessâand the stresses in the wood and reinforcement components were developed by regression analysis techniques. The reinforcing mechanism reduced the peak stresses at the butt joint and hence increased the ultimate strength of the member. Design of PLV material whose strength is limited by shear stresses that develop at the butt joint is facilitated by use of the proposed relationships.Experimental testing confirmed the predictions of the finite-element analysis. Failure initiated at the unreinforced joint in the specimens. Average tensile strength increased and variability decreased in reinforced specimens. Application of a small amount of reinforcement at the butt joint has been shown to enhance PLV performance
Tests of Lorentz violation in muon antineutrino to electron antineutrino oscillations
A recently developed Standard-Model Extension (SME) formalism for neutrino
oscillations that includes Lorentz and CPT violation is used to analyze the
sidereal time variation of the neutrino event excess measured by the Liquid
Scintillator Neutrino Detector (LSND) experiment. The LSND experiment,
performed at Los Alamos National Laboratory, observed an excess, consistent
with neutrino oscillations, of in a beam of . It
is determined that the LSND oscillation signal is consistent with no sidereal
variation. However, there are several combinations of SME coefficients that
describe the LSND data; both with and without sidereal variations. The scale of
Lorentz and CPT violation extracted from the LSND data is of order
GeV for the SME coefficients and . This solution for
Lorentz and CPT violating neutrino oscillations may be tested by other short
baseline neutrino oscillation experiments, such as the MiniBooNE experiment.Comment: 10 pages, 10 figures, 2 tables, uses revtex4 replaced with version to
be published in Physical Review D, 11 pages, 11 figures, 2 tables, uses
revtex
Search for Decay in LSND
We observe a net beam-excess of (stat) (syst) events,
above 160 MeV, resulting from the charged-current reaction of
and/or on C and H in the LSND detector. No beam related muon
background is expected in this energy regime. Within an analysis framework of
, we set a direct upper limit for this
branching ratio of at 90% confidence level.Comment: 4 pages, 4 figure
NASC-seq monitors RNA synthesis in single cells.
Sequencing of newly synthesised RNA can monitor transcriptional dynamics with great sensitivity and high temporal resolution, but is currently restricted to populations of cells. Here, we develop new transcriptome alkylation-dependent single-cell RNA sequencing (NASC-seq), to monitor newly synthesised and pre-existing RNA simultaneously in single cells. We validate the method on pre-labelled RNA, and by demonstrating that more newly synthesised RNA was detected for genes with known high mRNA turnover. Monitoring RNA synthesis during Jurkat T-cell activation with NASC-seq reveals both rapidly up- and down-regulated genes, and that induced genes are almost exclusively detected as newly transcribed. Moreover, the newly synthesised and pre-existing transcriptomes after T-cell activation are distinct, confirming that NASC-seq simultaneously measures gene expression corresponding to two time points in single cells. Altogether, NASC-seq enables precise temporal monitoring of RNA synthesis at single-cell resolution during homoeostasis, perturbation responses and cellular differentiation
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