97 research outputs found
Rough sketch of the roads from Cayuga to Chippewa
No full textHistoric sketch / map showing the southern section of the Niagara Peninsula. The sketch includes towns, creeks and roads. The purpose of this map was to indicate which roads were passable during each seasons, particularly in seasons where roads may be muddy. Sleigh roads, wagon roads, horse roads and foot paths are also labelled. The First Welland Canal can be seen beginning in Allanberg and ending in the south at Lake Erie. Mills, bridges, canals and main points of interest are labelled.Handwritten text provides historical information about conditions of the roads in the winter season at that time: “All these roads are passable in the sleighing season excepting the Lake roads which is obstructed with ice and stranded timber for an extent rendering all previous labour bestowed (?), vain, so far as my present information extends. Excepting having down stumps, no labor is recommended as this season on the roads; breaking ground or laying on fresh only renders them of more capacity for mud in the main season-where there are swamps or holes. Timber logs might be laid, but to drain or form the surface, by brush or otherwise at this season is of no use.The road from Cayuga Bridge to Canboro, all accounts represent as very bad, it is a new road and generally up to the girth in mud; holes of great depth 10 to 20 feet deep, are circumvented by the County people by pathes through the woods: horses are in (?) on it, one lately was shifted and died. – that from Cayuga down the river towards Dunnville and up thence towards the Tavern and Chippawa narrows in more usually taken. (Signed) R. I. Barou Major Royal Engineer Evan’s Tavern 13 Miles from Port Dover, 7th November 1838.” Second signature: “(A True Copy) F. A. Mackenzie Fraser Colonel Asst. Q. M. Genl.”Authorship indicated: Richard John Barou, F.A. Mackenzie FraserScale: [ca. 1:146,220]Digital reproduction: Library and Archives Canada, National Map Collection: NMC-3007. Black and white paper reproduction is available in Brock University MDGL. Call Number: G 3462 N53 1838 B37Described in: Mapping Upper Canada, 1780-1867 / Joan Winearls. 1991. Reference no.: 775
Role of compaction in melt extraction and accumulation at a slow spreading center: Microstructures of olivine gabbros from the Atlantis Bank (IODP Hole U1473A, SWIR)
No full textThe exposure of gabbroic sequences at Oceanic Core Complexes (OCC) along ultraslow- to slow-spreading ridges permits the study of the processes forming the lower oceanic crust. On top of the Atlantis Bank OCC along the ultraslow-spreading Southwest Indian Ridge, IODP Expedition 360 drilled Hole U1473A, mainly composed of primitive olivine gabbros interspersed with more evolved Ti-Fe oxide-bearing gabbros and minor felsic veins. These rocks record a complex history of protracted magmatism during continuous uplift and deformation of the gabbroic sequence. Extensive crystal-plastic deformation is dominantly recorded in the shallower sections of the drillhole, whereas the deeper sections better preserve primary magmatic features. We focus on microstructures, including intra-crystalline deformation of rock-forming minerals, and plagioclase crystallographic preferred orientations of olivine gabbros lacking evidence for exhumation-related crystal plastic deformation, to gain insights on the relationship between compaction, melt migration and melt accumulation during the early magmatic history of this section of lower oceanic crust. Olivine gabbros are characterized by ubiquitous grain-size variations, from coarse- to fine-grained intervals. Minerals in coarse-grained intervals show intra-crystalline deformation, while fine-grained crystals lack internal strain. Bent coarse-grained plagioclase associated with weak magmatic foliation and lack of lineation suggest that the coarse-grained intervals were deformed under weak compaction. On the other hand, crystallographic preferred orientations of undeformed fine-grained plagioclase show weak lineations, likely indicative of non-coaxial strain. We thereby infer that the coarse-grained intervals underwent ongoing weak compaction from the stage of olivine + plagioclase ± clinopyroxene crystal mush to the melt-poor stage, and that this process likely aided melt extraction and accumulation in discrete melt-rich zones where crystals orientated in the direction of magmatic flow. Crystallization of melts in the melt-rich zones ultimately formed the fine-grained intervals at different depths in Hole U1473A. This indicates that processes of compaction can lead to local chemical and grain-size heterogeneities in a lower crustal section, while had a minor role in the melt movement at larger scales (e.g., the whole crystal mush) within the oceanic crust
Raw data and MTEX script for the article : "Quantification of grain boundary mobilities in natural olivine by annealing experiments and full-field modelling"
No full text<p>This dataset contains the EBSD (.ctf) files of the different sample areas analyzed in the article : "Quantification of grain boundary mobilities in natural olivine by annealing experiments and full-field modelling" by J. Furstoss, S. Demouchy, A. Tommasi, E. Gardès, F. Barou and N. Marino, which is expected to be published in Tectonophysics. This repository also contains the Analyze.m MTEX script which has been used for the post-processing of the EBSD files. This script has to be run in matlab and outputs different figures and .csv files containing the raw data used in the article. For any questions please contact [email protected] </p>
Transparent Restoration
No full textThe aim of the research is to investigate the common ground between restoration practices and structural glass technology, as a new methodology to exploit our built heritage; a distinguishable, yet discreet restoration approach. Transparency is introduced by means of structural glass in an attempt to reinstate the image of the monument, allowing for a simultaneous perception of both its original and ruinous state. The design focuses on a new glass façade, as a restoration treatment for the case study of an old tower, located in Greece. Cast glass units are suggested in respect of the existing masonry construction techniques and the aesthetics of the original structure. In order to attain a reversible solution, as suggested by the restoration guidelines, dry connections are proposed in combination with interlocking geometries for the glass units, ensuring the overall stability. In the context of this research, aspects related to restoration principles, manufacture specifications, assembly and construction feasibility, mechanical behavior of the materials and compatibility have been also investigated.Architecture and The Built EnvironmentArchitectural Engineering and TechnologyBuilding Technolog
Dry interlayers out of cast polyurethane rubber for interlocking cast glass structures: experimental exploration and validation
No full textA novel, reversible structural system comprising interlocking, dry-assembled cast glass components is currently being developed at the TU Delft Glass & Transparency Lab. This paper, in continuation of the research conducted by (Oikonomopoulou et al. 2018a), investigates the mechanical properties of different materials that function as dry interlayers for interlocking cast glass structures. The interlayers should be preferably transparent, able to be pre-formed to the desired shapes, and resistant to UV-radiation-induced colour shifts, long-term compressive loads and creep. Based on the above criteria, polyurethane (PU) rubber with a shore hardness between 60A - 80A is chosen as the most suitable material. Accordingly, different readily available PU interlayers are selected and cast in the desired shape. Each interlayer is introduced between two interlocking osteomorphic cast glass components (bricks) and the assembly is tested under compression in series of 3 specimens. The experiments indicate that for the harder interlayer variants, failure mainly occurs due to peak stresses occurring at the shortest section of the brick, where the manufacturing tolerances of the concave-convex surface are the highest, leading to mismatch, i.e. incomplete contact at that area of the interlayer with the glass units. The stiffer interlayers further contribute to the failure due to the increased shear stresses induced at the edges of the interlocking surface while they are deforming. This is evident by the radial breaking pattern of the failed glass blocks. Interlayer variants with low tear resistance fail due to the perforation of the interlayer leading to glass-to-glass contact. Still, all specimens with interlayer in between presented a considerably higher failure stress than an assembly with no interlayer, highlighting the critical contribution of the PU to the structural performance of the system.Accepted Author ManuscriptStructural Design & MechanicsApplied Mechanic
The potential of cast glass in structural applications: Lessons learned from large-scale castings and state-of-the art load-bearing cast glass in architecture
No full textThis paper investigates the potential of cast glass structural components in architectural applications. Initially, the commonly applied casting methods, glass types and mould types are discussed. To address both the possibilities and limitations in the size and form of cast glass components, an overview of the largest monolithic pieces of cast glass ever made is presented, from giant telescope mirrors and nuclear glass blocks to massive artifacts. Weighing several tons each, these cast glass pieces are assessed with comparative charts of technical data collected from literature, industry and field research, regarding their geometry, materialization, manufacturing method and annealing process. The data highlight not only the potential but also the practical implications involved due to the meticulous and time-consuming casting and annealing process of three-dimensional glass elements. Learning from the extreme, proposals are made for optimizing the size, shape and casting process of cast glass components suitable for architectural applications. Subsequently, the state-of-the-art architectural examples employing cast glass are analyzed and evaluated in terms of manufacturing, structural system, level of transparency, ease of assembly and disassembly. Based on the findings the authors suggest new design concepts for cast glass components that can take full advantage of the glass’ properties and can result in novel, transparent, yet load-bearing architectural applications.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.Structural Design & MechanicsApplied MechanicsOLD Structural Desig
Tuber melanosporum Vittad. abundance and specific soil parameters predict soil enzymatic activity in wild and managed truffle producing systems
No full textSoil microorganisms are able to produce extracellular enzymes and are crucial for ecosystem processes like decomposition and nutrient cycling. The black truffle (Tuber melanosporum Vittad.) is a highly valued ectomycorrhizal edible fungus. It exerts a strong allelopathic effect, creating a burnt area around the host tree that impacts soil biotic and abiotic properties, and likely affects soil functioning as well. This study investigated the influence of black truffle abundance on soil functions, at different seasons and truffle-producing systems. A regional field design was set up in black truffle productive plantations and forests across the natural distribution area of this fungus in Spain. Physico-chemical soil properties, potential soil enzymatic activities related with carbon, phosphorus and nitrogen cycling, and soil fungal richness and abundance were determined. Black truffle-producing forests generally exhibited lower enzymatic activity compared to plantations, except for chitinase. Besides greater soil enzymatic activity —mainly related with rapid carbon and nitrogen turnover— was observed in late spring than autumn, independently of the type of truffle producing system. Our findings revealed a significant negative impact of black truffle abundance on soil enzymatic activities, and particularly on those involved in carbon and nitrogen mobilisation. Besides the strong local site effect, other biotic and abiotic factors differently impacted soil functioning in truffle forests (Mg) and plantations (Ascomycetes richness, CaCO3, Na). These results offer insights into the ecology and functionality of host-truffle-soil interactions and provide valuable information for optimising management practices in black truffle plantations.The work was supported by the projects TUBERSYSTEMS (RTI2018-093907-B-C21/22) and TUBERLINKS (PID2022-1364780B-C31) founded by the Spanish Ministry of Science and University (MCIU). This research is part of the thesis of the first author, V. Barou, who is enrolled in the program of Plant Biology and Biotechnology of Universitat Autònoma de Barcelona and holds a pre-doctoral fellowship awarded by MCIU (PRE2019-091338).info:eu-repo/semantics/publishedVersio
Codes from paper "Dynamic recrystallization by subgrain rotation in olivine revealed by electron backscatter diffraction"
No full textThese are the codes needed to generate the figures in the manuscript entitled:Lopez-Sanchez MA, Tommasi A, Ben Ismail W, Barou F. Dynamic recrystallization by subgrain rotation in olivine revealed by electron backscatter diffraction. Tectonophysics 815: 228916 https://doi.org/10.1016/j.tecto.2021.228916</div
Transparent Restoration
No full textThis paper investigates the application of structural glass in restoration and conservation practices in order to highlight and safeguard our built heritage. Cast glass masonry is introduced in order to consolidate a half-ruined historic tower in Greece, by replacing the original parts of the façade that are missing. Dry connections between the elements contribute to a completely reversible system that complies with the conservation guidelines suggested by the Venice Charter, while the interlocking nature of the glass units ensures the overall stability and the desired structural consolidation of the monument.Applied MechanicsStructural Design & Mechanic
Le Brésil, terre d'inspiration de l'ethnologie française
No full textInternational audienceThe Brasil and the French Anthropology are associated to the well known name of Claude Lévi-Strauss. During the thirties, the author of Tristes tropiques has expperienced his methods by living among the traditionnal Amerindian societies. For other anthrologists, the Brasil became the place of an intimate experience like in the the case of Pierre Verger who was initiated to the cult of Ifa imported from AfricaLe Brésil et l'ethnologie française sont associés le plus souvent à un nom célèbre : Claude Levi-Strauss. Dès les années trente, l'auteur de Tristes tropiques a façonné ses méthodes et son regard aux côtés des sociétés amérindiennes. Plus qu'un terrain d'études, le Brésil est devenu pour d'autres ethnologues le lieu d'une expérience intime. En témoigne l'initiation de Pierre Verger au culte yoruba d'Ifa, importé par les descendants d'Africains
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