Littérature scientifique sur le sujet « Shelly ridges »
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Articles de revues sur le sujet "Shelly ridges"
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Kowalewski, Michal, Karl W. Flessa et Jill A. Aggen. « Taphofacies analysis of recent shelly cheniers (beach ridges), northeastern baja california, Mexico ». Facies 31, no 1 (décembre 1994) : 209–41. http://dx.doi.org/10.1007/bf02536940.
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Jeanson, Matthieu, Samuel Etienne et Antoine Collin. « Wave attenuation and Coastal Protection by Shelly Ridges : Mont-Saint-Michel Bay, France ». Journal of Coastal Research 75, sp1 (3 mars 2016) : 398–402. http://dx.doi.org/10.2112/si75-080.1.
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Kidwell, Susan M. « Internal anatomy and skeletal taphonomy of marine sequences : variation with subsidence ». Paleontological Society Special Publications 6 (1992) : 165. http://dx.doi.org/10.1017/s2475262200007255.
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Skeletal concentrations are common foci for paleontologic collecting, yet vary widely in their expected levels of taphonomic bias, particularly temporal resolution and biological fidelity. Basic concentration types include: (1) simple event-concentrations composed of anything from autochthonous-census, entirely exotic, or entirely remanié assemblages (e.g., shelly tempestites, shell-lined burrows); (2) composite concentrations of many stacked to complexly amalgamated events, accumulated in normal to expanded thickness (e.g., bioherms, shell banks & fans); (3) stratigraphically condensed hiatal concentrations having an even greater minimum degree of assemblage-level taphonomic bias (e.g., transgressive shelly sands, sediment-starved bone beds); and (4) lag-concentrations formed by erosion/corrosion of significant section and composed typically of highly culled and time-disordered skeletal material. Detailed field study of three temperate to subtropical basins in North America and reconnaissance of other basins at similar and lower paleolatitudes indicate that these four concentration types are distributed systematically within unconformity-bounded sequences and, moreover, that marine sequences vary qualitatively both in their stratigraphic anatomy (e.g. Van Wagoner et al., 1990; Einsele & Bayer, 1991) and skeletal taphonomy as a function of long-term subsidence.I. Basins of moderate subsidence (total 10's cm/ka maintained over 1–10 ma) are characterized by “textbook” sequences composed of discrete upward-shallowing parasequences in transgressive and highstand/regressive marine phases. Taphonomically, sequences in these settings typically contain a variety of concentration types, and therefore require careful taphonomic differentiation. In the shale-rich Cretaceous Ostracode Zone (Alberta foreland basin; Banerjee & Kidwell, 1991), for example, composite shell beds mark the tops of parasequences near the basin margin, event-beds of granulated shell mark the bases of parasequences further offshore, and diagenetically complex, shell-poor hiatal limestones mark maximum flooding surfaces in the most distal areas.II. Basins of high subsidence (total 100's cm/ka maintained over ≥1ma) are typically characterized by expanded sequences with vague parasequences; sedimentary cyclicity is linked more clearly to local tectonism and autocyclic environments than to eustasy. Taphonomically, these records are dominated by comparatively straightforward event- and composite concentrations. In the Mio-Pliocene Salton Trough (Gulf of California rift basin), for example, oyster bioherms and shell-ridges cap upward-shallowing delta-front cycles, and coral-bearing bioclastites occur along the distal toes of coastal alluvial fans and are banked against inter-fan rocky shorelines. Hiatal concentrations are poorly developed, even along downlap surfaces, and laterally extensive lags are rare.III. Basins of low subsidence (total ≤ few cm/ka maintained over 1–10 ma) are characterized by stratigraphically telescoped sequences with poorly developed (and locally deepening-up) “parasequences”; transgressive surfaces largely coincide with sequence boundaries. Hiatal and lag concentrations are relatively common and close-spaced stratigraphically; these may be taxonomically diverse even in temperate latitudes owing to environmental condensation, and in all instances are taphonomically complex. In the Miocene Chesapeake Group (outcropping U.S. Altantic passive margin), 4 transgressive hiatal shell concentrations lie within 40 m of section; each contains up to ~100 species and rests directly on a 3rd-order sequence boundary. A starved hiatal bone bed with high microplankton diversity marks the major 2nd-order downlap surface; lags of comminuted bones, teeth, and mollusk steinkerns mantle shallow-water unconformities near lap-out.
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Mury, Antoine, Matthieu Jeanson, Antoine Collin, Dorothée James et Samuel Etienne. « High Resolution Shoreline and Shelly Ridge Monitoring over Stormy Winter Events : A Case Study in the Megatidal Bay of Mont-Saint-Michel (France) ». Journal of Marine Science and Engineering 7, no 4 (4 avril 2019) : 97. http://dx.doi.org/10.3390/jmse7040097.
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In the current context of decadal global changes and predicted sea level rise, annual erosion is one of the most obvious indicators of threats to coastal systems. Shoreline monitoring during high energy events is therefore a crucial action to prevent and alleviate future coastal risks. However, most studies look at this on a regional issue basis with limited resolution, and with limited support from field observations. This study addresses this lack by focusing on high resolution (HR) shoreline surveys, combined with wave measurements, in the megatidal Bay of Mont-Saint-Michel. The salt marsh vegetation line and the inner margin of shelly ridges were selected as markers of the stabilized shoreline, to follow its evolution during two high energy winter events, from February 18 to 24, 2015 and from March 19 to 24, 2015, in two different study sites. A transdisciplinary methodology was adopted which included: 1) in situ wave measurements with pressure sensors, 2) topographical data acquisition using a differential GPS, and 3) in silico observations of the shoreline movements through HR aerial and satellite imageries. Our findings highlighted the positive linkage between significant wave height and erosion rate (ranging from 0 to 60.9 m), as well as the variability of coastline responses depending on the geomorphic features.
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Bérard, Hélène, Edwin Bourget et Marcel Fréchette. « Mollusk Shell Growth : External Microgrowth Ridge Formation is Uncoupled to Environmental Factors in Mytilus edulis ». Canadian Journal of Fisheries and Aquatic Sciences 49, no 6 (1 juin 1992) : 1163–70. http://dx.doi.org/10.1139/f92-130.
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Low-frequency (e.g. annual) external ridges have been used in the study of bivalve population dynamics, and it has been suggested that ridges produced at high frequencies are related to environmental factors. Using laboratory and field experiments, we examined the usefulness of fine external growth ridges as markers of cyclic growth patterns in the blue mussel, Mytilus edulis. Shells of M. edulis were analyzed to examine coherence of patterns of ridges on the shells. Analysis was carried out in two steps: (1) An objective method was developed to characterize the ridges by their height and thickness (precision 0.5 μm) and (2) laboratory and field experiments were carried out to determine the influence of environmental factors (immersion and emersion, algal concentration) and biological factors (valve closure) on the periodicity of growth ridge formation. All mussels exhibited unique growth ridge patterns. There was no concordance between growth ridge patterns of individual mussels grown together in the laboratory or in the field. These results refute the hypothesis of a similar growth ridge pattern between individuals in Mytilus at small scales. No relation was found between the mechanical closure of the valves and the formation of growth ridges.
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Zhang, Jinbo, Qingzhu Zhang, yiyuan Ge et yongcheng jiang. « Analysis of the Wear-Resistance Characteristics of Bionic Ridge Structures ». Applied Engineering in Agriculture 36, no 5 (2020) : 697–702. http://dx.doi.org/10.13031/aea.13680.
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HighlightsBionic technology can be applied to resolve agricultural engineering problems.Pangolin Squama and Chlamys Farreri shells possess excellent wear-resistance.Bionic ridges can improve sample wear-resistance.Abstract. Consistent soil contact rapidly wears the soil-engaging components of agricultural machinery, such as ploughs and subsoilers. A bionic method was applied to their structural design to improve component wear resistance. Some animal organs possess excellent wear-resistant structures which can provide design inspiration for improving the wear-resistance of agricultural mechanical parts. Previous research found that many ridges exist on Pangolin squama and Chlamys Farreri shell surfaces. Those ridges cause Pangolin squama and Chlamys Farreri shells to exhibit excellent wear-resistance. Therefore, these ridge structures were applied to the design of experimental subsoiler samples (bionic samples) to enhance their wear-resistance. An abrasive wear tester was utilized to conduct abrasive wear experiments under special experimental conditions. These experimental conditions involved sliding speed, soil particle size, moisture content, and space between the ridges. Finally, nine experiments were conducted that subjected the bionic and flat surface samples to different experimental conditions, and their respective mass-loss quantities were measured. Results show that bionic sample mass loss was less than that of the flat surface samples under the same experimental conditions; bionic sample wear-resistance improved by 77%, 73.8%, 66.9%, 45.4%, 58.9%, 65.5%, 33.1%, 66.4%, and 42.6% when compared with flat surface samples under the same experimental conditions. Orthogonal test results reveal that the soil particle size most significantly affected sample wear-resistance, followed by the space between bionic ridges and the sliding speed. One reason that bionic samples exhibited excellent wear-resistance is that the soil particles underwent a “guiding effect” and a “rolling effect” over the bionic ridge surface, thereby reducing the “micro-plowing” that soil particles generated when moving over the contact surface. Mutual interference among soil particles also reduced wear. Part of the soil particles rushing over the bionic sample surface rebounded back; the rebounded soil particles collided with incoming soil particles, then the speed and kinetic energy of all of the particles decreased and sample surface abrasion declined. Moreover, “vortexes” generated by sample surface air and ridges lead to an “air cushion” effect which can lessen the number of sample surface soil particles, and bionic ridge sample abrasions can be significantly reduced. Abrasion experiment results analysis indicates that bionic ridges distributed on subsoiler sample surfaces can significantly improve wear-resistance. The bionic design method provides a new approach for increasing the wear-resistance of the soil-engaging components of agricultural machinery. Keywords: Abrasive wear, Bionic ridge, Optimal design, Wear-resistance.
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Parsons, G. Jay, Shawn M. C. Robinson, John C. Roff et Michael J. Dadswell. « Daily Growth Rates as Indicated by Valve Ridges in Postlarval Giant Scallop (Placopecten magellanicus) (Bivalvia : Pectinidae) ». Canadian Journal of Fisheries and Aquatic Sciences 50, no 3 (1 mars 1993) : 456–64. http://dx.doi.org/10.1139/f93-053.
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Postlarval giant scallop (Placopecten magellanicus) were examined for daily growth ridges and growth rates by marking the dissoconch shell with Alizarin red dye. The surface of the left valve of postlarvae was composed of concentric ridges, each consisting of a series of irregularly shaped raised nodules. Ridges were clear and distinct in newly settled scallop between ≈0.25 and 2.0 mm shell height. The shell of postlarvae >2 mm was pigmented and ribbed and ridges were no longer distinguishable. Estimated age was significantly correlated with actual age, suggesting that growth ridges were produced daily, under the environmental conditions of Passamaquoddy Bay. Mean growth rate ranged from 32 to 57 μm∙d−1 and was proportional to size and age, but growth of individual scallop showed no coherence in their daily growth patterns. The short-term growth ridges in postlarval giant scallop can be used to determine age and can be applied to comparative growth, mortality, and recruitment studies of newly settled individuals <2.0 mm (≈40 d old postsettlement). The high accuracy and precision of age determination for postlarval scallop differs from studies of short-term internal growth increments of bivalve shells and larval fish otoliths.
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Patterson, R. Timothy, Charlotte A. Brunner, Rosemary Capo et Jeremy Dahl. « A paleoenvironmental study of early to middle Pleistocene foraminifera of the Santa Barbara Formation at Santa Barbara, California ». Journal of Paleontology 64, no 1 (janvier 1990) : 1–25. http://dx.doi.org/10.1017/s0022336000042190.
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An interval of the Early to Middle Pleistocene history of the California Borderland was assessed using multivariate analysis of foraminifera from the Santa Barbara Formation at Bathhouse Beach, Santa Barbara, California. A census of 93 species of benthic foraminifera and nine species of planktonic foraminifera was compiled from 11 samples from the shelly marls, silts, and sands of the lower member. Most species of benthic foraminifera are rare and only 38 species comprise one percent or more of the population in one or more samples.Paleoenvironment of the sea floor was determined based on benthic foraminifera. R-mode cluster analysis defined five associations which are similar to those of the present-day banks and terraces of the California Borderland. Q-mode cluster analysis grouped samples into four biofacies which characterize shallow banks near 50 meters water depth and off-shore ridges and deep banks averaging 150 meters water depth. The stratigraphic succession of biofacies indicates two transgressive cycles separated by an apparent disconformity between 7.5 and 8.9 meters above the base of the section (between samples 3 and 4).Paleoceanography of surficial waters was interpreted from planktonic foraminifera. Paleotemperature was assessed from the proportion of sinistral to dextral morphs and from the proportion of encrusted, compact morphs to reticulate, globular morphs of Neogloboquadrina pachyderma. The coiling morphs show a warm interval from the base of the section to about 12 meters (between samples 5 and 6), and a cooler interval from about 12 meters to about 24 meters (between samples 10 and 11), and an interval of intermediate paleotemperature in the topmost sample of the section. Changes in the planktonic assemblage do not coincide with the transgressive cycles inferred from the benthic biofacies.The Bathhouse Beach section can be placed chronostratigraphically based on planktonic foraminiferal coiling shifts and strontium isotopic data. The isotopic age range of 400 to 900 Kyr brackets the 600 Kyr age assigned by Lagoe and Thompson (1988) to the Neogloboquadrina pachyderma coiling dominance interval CD9/CD8 boundary which occurs midway in the section, between samples 5 and 6.
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Richa, Ramy, Essam Osman, Nahed Attia, Hani Arakji et Mohamed Shokry. « Evaluation of Modified Shell Technique in 3D Ridge Reconstruction : A Clinical and Radiographic Study ». European Journal of Dental and Oral Health 4, no 6 (8 décembre 2023) : 21–26. http://dx.doi.org/10.24018/ejdent.2023.4.6.307.
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Introduction: As a result of tooth loss, alveolar ridge resorption sacrifices bone volume including bone width. In order to replace the lost dentition with implants functionally and esthetically, bone augmentation procedures are carried out. Materials and Methods: Fifteen patients were selected to treat mandibular alveolar ridge resorption with an autogenous block graft harvested using piezoelectric surgical tips and split into two shells using a diamond disk then fixated on the decorticated defective ridge. Particulate xenograft bovine bone was then inserted between the fixated shell and ridge, the second shell was used to roof the bone particles. Results: The modified shell technique could be an alternative to other ridge augmentation techniques. This study shows promising clinical and radiographic results that carry the advantages of being: safe and precise cutting using Piezoelectric tips, the statistical data showed a significant difference in 3D bone volume where no unfavorable complication was detected. Conclusion: The modified shell technique showed a reliable technique in cases of 3D ridge reconstruction since it holds the advantages of autogenous bone properties and the rigidity of the bone shells that maintain the space necessary for augmentation. The use of PRF can accelerate wound healing and minimize the risk of flap dehiscence as well as it can speed up bone formation.
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azab, mostafa, mohamed diaa, amr ghanem et mahmoud badr. « Three-Dimensional Maxillary Alveolar Ridge Augmentation Using Three-Dimensional Maxillary Alveolar Ridge Augmentation Using Modified Cortical Shell Technique and Composite Bone Graft ». future dental journal 7, no 1 (1 juin 2021) : 7–14. http://dx.doi.org/10.54623/fdj.7012.
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Objective: The present study was performed to assess the 3D alveolar ridge augmentation using the cortical shell from retromolar region and composite bone particulate regarding the width of the residual alveolar ridge. Methods: Thirteen patients with age range 21-40 years old having atrophic anterior maxillary ridge ≤3mm horizontally were included in the study. All patients were subjected to ridge augmentation using composite bone graft and retromolar cortical shell that was fixed in place by two micro-screws. The alveolar ridges were assessed and compared by cone beam computed tomography (CBCT) in the pre-operative, immediate and 4 months post-operative phases by taking linear measurements at the same points after making fusion. The measurements were taken at the crest of the ridge, midway and more apically. The CBCT images were evaluated for the actual gain in width of the alveolar ridge. Statistical analysis was performed to compare CBCT and clinical findings. Results: At the crest of the ridge, midway and more apically the results showed a statistically significant difference between pre-operative and immediate post-operative results (P0.05). The mean increases in crestal bone width, midway and apically at 4 months postoperatively were 3.66mm, 4.01mm and 3.5mm respectively. Conclusion: 3D reconstruction of anterior maxillae with autogenous retromolar cortical shell is a reliable technique with stable outcomes. Two micro- screws Stabilization provides stability and minimal graft resorption. Moreover, the technique allows for implant placement 4 months post-operatively without further re-grafting.
Thèses sur le sujet "Shelly ridges"
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Traoré, Kalil. « Architecture de couverture sédimentaire et enregistrement des fluctuations climatiques : baie de Sant-Brieuc ». Electronic Thesis or Diss., Lorient, 2022. http://www.theses.fr/2022LORIS626.
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La morphologie et la structure interne du banc de sillage de la Horaine sont décrites à partir de donnéesobtenues par sondeur multifaisceaux et sismique réflexion haute résolution, couplées à des données de vibrocarottage et datations au radiocarbone. La structure interne du banc révèle 4 unités sismiques (U1-U4) sur un socle protérozoïque (U0). L'unité basale U1 est interprétée comme des sédiments fluviatiles de bas niveau marin remaniés pour remplir les micro-incisions du socle protérozoïque lors la transgression holocène. Cette unité est recouverte par l’unité U2, mise en place par dérive littorale à la manière des flèches sableuses, dans un contexte de remontée rapide du niveau marin. L'unité U3 progradante est interprétée comme des dépôts d'inondation marine en continuité avec l'unité U2. L'unité U4 est caractérisée par des réflecteurs obliques orientés dans 2 directions opposées. Cette dernière unité, datée entre 3800 et 3500 ans BP, correspond à des dunes migrantes surimposées au banc et observables également à partir des données bathymétriques. La forte corrélation entre les courants tidaux et la direction apparente de migration des dunes dans le sens horaire, suggère la présence d'un gyre tidal contrôlant la dynamique actuelle de la plupart des dunes associées au banc. Un comblement important de fond de baie par migration de barres sableuses (~100m/an), et régime de flux dispersif est observé grâce de l’imagerie satellitaire et photogrammétrie SfM par drone. Le recoupement avec l’analyse exploratoire des données climatiques ERA5 du programme Copernicus a permis de préciser qu’à moyen terme (échelle décennale), la migration des barres est contrôlée par la dynamique tidale (puissance hydraulique, temps d’immersion des barres) et à court terme (échelle saisonnière) le contrôle de la dynamique intertidale semble être assuré par la houle, et les tempêtes. Cette étude propose une nouvelle approche intégrée (mer-terre) pour le suivi de la dynamique de baieThe morphology and internal structure of the Horaine banner bank are described using multibeam and high- resolution seismic reflection data, coupled with vibro-coring and radiocarbon dating. The internal structure of the bank reveals 4 seismic units (U1-U4) on a proterozoic basement (U0). The basal unit U1 is interpreted as reworked lowstand fluvial sediments those infilled micro incised valleys during a rise in sea level. This unit is overlain by paleo-coastal barrier sand-spit (U2) whose development was controlled by swell in the context of a rapid rise in sea level. The successive prograding unit (U3) is interpreted as flooding deposits in continuity with unit U2. The unit U4 is characterized by oblique reflectors oriented in two opposite directions. This last unit, dated between 3800 and 3500 yr. BP, corresponds to migrating dunes superimposed on the bank and observable in the high-resolution bathymetric data. The strong correlation between tidal currents and the apparent clockwise migration of dune crests suggests the presence of a tidal gyre controlling the present- day dynamics of most of the Horaine bank dunes. A significant filling of the bay intern part by sand bar migration (100m/year on average), and dispersive flood regime is observed thanks to satellite imagery and UAV SfM photogrammetry. The cross-check with the exploratory analysis of the ERA5 climate data of the Copernicus program allowed to specify that in the medium term (decadal scale), the migration of the bars is controlled by the tidal dynamics (hydraulic power, immersion time of the bars) and in the short term (seasonal scale) the control of the intertidal dynamics seems to be ensured by the swell, and the storms. This study proposes a new integrated approach (sea-land) for monitoring bay dynamics
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Crawford, Frances R. « Geomorphology of shell ridges and their effect on the stabilization of the Biloxi Marsh, East Louisiana ». ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2544.
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Extensive shell ridges frame the edges of marsh platforms in parts of the Biloxi Marsh of southeast Louisiana. The exact sources of the shells in these accumulations have not been clearly identified but the most likely source is a combination of shells from modern offshore and shells excavated from buried St. Bernard delta deposits. Larger or fetch-protected ridges remain stable through time, whereas ridges facing open water are more mobile, moving as much as 38 m inland from July 2017 to January 2018. Behind stable ridges, marsh platform biomass is relatively unaffected. When ridges are mobile, vegetation is smothered, leaving an exposed platform that lacks aboveground vegetation to dampen wave energy and fragments into “blocks” along its terraced edge, which in turn are deposited onshore. In the future, marshes will likely erode fastest in areas where shell ridges are mobile and remain resistant where shell ridges are stable.
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Stewart, Lewis. « Investigation of Sediment Ridges Using Bathymetry and Backscatter near Clearwater, Florida ». Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7091.
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Changes in sediment morphology on the West Florida Shelf is investigated over a 14-year time period using multibeam bathymetry and backscatter in water depths between 10 m and 20 m, off the coast of Indian Rocks Beach, Pinellas County, Florida. Bathymetric surveys collected in 2002 (Kongsberg EM 3000 at 300 kHz) and 2016 (Reson 7125 at 400 kHz) were processed using CARIS Hips and Sips to create bathymetric maps and backscatter images. These data were then interpreted and compared in order to test hypotheses and answer questions related to sediment migration and sediment volume change.
The following questions prompted this study:
A. How mobile is the sediment on the limestone?
B. What sedimentary changes occurred following the 2002 and 2003 deployments of mines for an Office of Naval Research project?
C. How much sediment was removed during dredging and how closely does it compare to the Army Corps of Engineers’ reported estimate during the beach renourishment of Sand Key in 2012?
In order to answer these questions, hypotheses were proposed:
Hypothesis A:
The sediment ridges in the study site have not migrated significantly over the limestone hard bottom during the 14-year time period (Hafen, 2001; Edwards et al. 2003).
Hypothesis B:
There is no change in sediment volume where the mine-like object were placed and removed after the ONR mine burial experiment (Wolfson 2005 Wolfson et al. 2007).
Hypothesis C:
Changes in sediment volume between 2002 and 2016 will match the amount estimated by the Army Core of Engineers who dredged the area.
Results show that the sediment ridges in the study area had some migration over the limestone hard bottom during the 14-year time period. The results also found that there was a sediment volume change where mine-like objects were placed and removed during the Office of Naval Research mine burial experiment because of a dredging operation in 2012 that dredged sediment from the experimental area. Specific areas investigated that surround the dredging area showed significant loss of sediment, with the change in hydrodynamics from dredging influencing this sediment loss. The volume of sediment removed from the aforementioned dredging cut was found to be within 16% of that estimated in the Army Corps of Engineers report prior to the dredging.
Geologic interpretations of the backscatter images interpreted strong backscatter returns as limestone, mid strength returns as coarse shell hash and weak returns as fine to medium-grained sediments. The weak returns were found primarily on the sediment ridges. The dredging cut showed stronger returns than the surrounding ridge, indicating that underlying coarse sediments were most likely compacted and composed of shell hash.
Using satellite remote sensing as a way to gather continual repeat coverage at high resolution (2 m) data to determine absolute depth in these water depths is investigated and preliminary results suggest that processed 250 m pixel MERIS data will give a similar depth range as multibeam bathymetry. The higher-resolution 0.5 m pixel raw WorldView 2 data shows NW-SE trending structure, suggesting the seafloor morphology will be more visible.
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Salsi, Matteo. « Foam Making Sense - Integration of agent-based logics, behavioral robotic deposition and material feedback for multi-performance ridged shells, with a case study of an open space enhancer integration of agent-based logics, behavioral robotic deposition and material feedback for multiperformance ridged shells, with a case study of an open space enhancer ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Trouver le texte intégralRésumé :
La seguente tesi di ricerca affronta il progetto architettonico da un punto di vista multidisciplinare, integrando biomimetica, informatica, computer vision e robotica. L’indagine si focalizza sull’interazione via feedback tra un robot, utilizzato per la deposizione di materiale, e un algoritmo basato su sistemi complessi ispirati al mondo biologico. L’obiettivo è quello di esplorare le potenzialità morfologiche, costruttive ed espressive generate dall’influenza reciproca di design computazionale e comportamento materico reale.
Alla base di questa ricerca vi è l’approfondimento dei sistemi stigmergici, utilizzati nella programmazione dell’algoritmo che definisce le traiettorie eseguite dal robot, e la messa a punto di un sistema di visione e scansione tridimensionale che agisce come mezzo di comunicazione tra ambiente reale e digitale. Lo sviluppo di questi temi ha portato alla realizzazione di un processo iterativo di scansione e deposizione che genera un risultato non determinabile a priori ma che è frutto della negoziazione tra le intenzioni progettuali, i limiti fabbricativi, le performance richieste e il comportamento del materiale.
I risultati ottenuti hanno portato alla realizzazione di superfici architettoniche in vetroresina dove il materiale depositato, schiuma poliuretanica, sviluppa un sistema di nervature che integrano performance strutturali, funzionali e ornamento. I mold necessari alla laminazione del fibrocomposito sono stati realizzati per mezzo di superfici rigate e robotic Hot-Wire Cutting, tecnica che consente l’impiego di materiali riciclabili di relativa economicità e il taglio di grandi superfici in tempi brevi.
Infine, è stata studiata l’applicazione architettonica del sistema con la realizzazione di un open-space polifunzionale all’interno di un progetto di riqualificazione urbana attualmente in atto presso il Parco Innovazione delle Ex-Officine Reggiane a Reggio Emilia.
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Schwab, Julia [Verfasser]. « Sediment dynamic, slope instability and potential tsunami hazard at the outer Thai shelf margin, Mergui Ridge, Andaman Sea / Julia Schwab ». Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1150704381/34.
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Hueppauff, Anna. « The social value of contemplating poetry ». Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2522.
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Justifications for defunding the Arts and Humanities are well rehearsed: public funds should be reallocated toward developing skills directly leading toward sustainable employment, that is, toward labour streams demanded by industry. President John F. Kennedy took a different view, envisioning the role of the artist (and poet in particular) as an essential moral function. For Kennedy, the poet is both philosopher and prophet, providing a moral compass that leads the nation back to its better self when excesses of power have corrupted it from within. The role Kennedy assigned to poets echoes the civic/cultural practice of theoria (contemplation), a pilgrimage for the pursuit of knowledge enacted by ancient Greek intellectuals. Notably, for Plato and earlier Greek intellectuals, the insight gained from this contemplative endeavour was expected to have practical value and advance the city state, which indicates that outcomes mattered. Like Plato, Hannah Arendt also links the progress of civilisation with the quality of our thinking. As is well known now, Arendt attributes banal acts of evil to thoughtlessness, thus heightening the imperative ‘to think what we are doing’. There is evidence to suggest that contemplative compassion training can work as a potential mode to bridge the motivational gap between empathetic awareness and moral action. Western pedagogic and psychotherapeutic strategies incorporate contemplative principles for their capacity to support transformation. These interventions draw on Buddhist conceptions of wisdom, distress tolerance, and non-judgmental awareness to develop a structure for training compassion, thereby enabling the agent to move from intention to productive action. This thesis therefore explores the potential for poetry to participate in this work.
The first part of this thesis considers how poets have long modelled the capacity of poetry to do political work, as demonstrated by fifth century BCE poet-legislator Solon, who recorded justifications of his laws in poetry. The second part examines how the Romantic poets foreshadowed Kennedy’s idealised philosopher poet by 200 years, including the 18th century poet Anna Letitia Barbauld, who enacted the political work elevated by Arendt through poetry and prose that outlines the obligations of the citizen and critiques the actions of the state. The third part explores how poets in the early 20th century participated (or not) in this kind of work. The contribution of ‘High Modernist’ T. S. Eliot is assessed as well as the Modernist anarchist poet, Lola Ridge, who advocated for marginalised, incarcerated, and deceased identities in both the public and private realm. By reinserting poetry into the public sphere, Ridge models how poetry can be repurposed toward political/moral ends and provide a unique platform for social critique and the emergence of new identities. The thesis concludes by considering how, in addition to public advocacy, poetry may also participate in compassion training. Following psychotherapeutic interest in Buddhist principles to facilitate transformation, this thesis explores the capacity of poetry to participate in cultivating compassion by reading T. S. Eliot’s ‘The Waste Land’ and Four Quartets and Lola Ridge’s ‘The Ghetto’ (and other poems) through the Buddhist lens of the Four Noble Truths. These readings demonstrate that poetry can do more than provide aesthetic pleasure. As an effect of and a medium for contemplation, poetry can facilitate critical thinking; further, it can stimulate creative possibilities toward realising moral ends. Crucially, it can cultivate moral agency by enlarging our capacity for compassion. In short, the contemplation of poetry can enable us to follow Arendt’s council to ‘think what we are doing’.
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Leva, Lopez Julio. « Fluvial, shoreline, and clastic wedge responses to foreland basin and Laramide style subsidence : Examples from experimental studies and the Greater Green River Basin, southern Wyoming ». Thesis, 2014. http://hdl.handle.net/2152/26608.
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Subsidence is one of the main factors controlling the stratigraphy and overall stratal architecture in tectonically active basins. This was particularly important in the Western US Cordilleran foreland and Laramide basins when some other controls were minor, e.g. reduced eustatic fluctuations in the late Cretaceous greenhouse period. The first part of the dissertation examines the upper Campanian Williams Fork Clastic Wedge (WFCW) in southern Wyoming and northern Colorado, through an outcrop and subsurface database. The WFCW built out from the Sevier orogenic belt like earlier clastic wedges, but its large-scale geometry changed as basement involved Laramide structures partitioned it. At the center of the WFCW there is an extensive fluvial sandstone sheet, the Canyon Creek Member of the Ericson Formation. From its proximal to distal reaches (~200 km) there is a first order trend of stratigraphic thickening and net-to-gross reduction, and a change from braided to meandering depositional style. These trends are caused by isostatic rebound of the foreland basin during periods of relative quiescence in the Sevier orogenic belt and by the eastward migration of dynamic subsidence. However, this long spatial trend was markedly modified by differential subsidence across Laramide-style structures. The Campanian age initiation of the Laramide structures appears to be earlier than the Maastrichtian to Paleogene age commonly attributed to the initiation of this orogeny. The second part of this research focuses on the transgressive limb of the WFCW, particularly on two sandstone bodies isolated in marine mudstones in the uppermost Almond Formation. The sandstone bodies previously interpreted as lowstand shoreline deposits are re-interpreted as transgressive shelf ridges generated by tidal currents and storm waves. There are limited examples of ancient tidal shelf ridges published and no facies model was described. Using Almond Fm. outcrops and examples from the literature, the diagnostic characteristics of storm and tidal shelf ridges are presented. The third part of the dissertation investigates the effects of differential subsidence on the large scale stratigraphic infill of a foreland basin through a geometric model and a series of flume experiments. The mathematical model and flume experiments show that despite constant allogenic forcing, three distinct autogenic responses in stratal architecture, associated with the imposed tectonic and sediment supply conditions are possible. The first response was “autoretreat”, where shoreline migration switched from initial progradation to retrogradation. The second response was progradation followed by constant aggradation. The third response was maintained progradation with a markedly accelerating rate, a new autogenic behavior termed “shoreline autoacceleration”.text
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Hiebert, Samuel Franz. « High-resolution correlation framework of the Grayburg Formation-Shattuck Escarpment and Plowman Ridge : testing models of shelf-to-basin frameworks ». Thesis, 2013. http://hdl.handle.net/2152/28236.
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The San Andres and Grayburg Formations are important stratigraphic units for constructing correlation frameworks of the Guadalupe Mountains because these strata record the transition between the ramp profiles of the San Andres along the Algerita Escarpment and the reef-rimmed platforms of the Capitan Formation of the southern Guadalupe Mountains (Franseen et al. 1989). Sarg et al. (1999) and Kerans and Tinker (1999) have published significantly different models of shelf-to-basin correlations within this stratigraphic interval. Central to the debate is the correlation of mixed carbonate-siliciclastic strata exposed at Plowman Ridge in the Brokeoff Mountains to the better-constrained strata along the Shattuck Escarpment in the Guadalupe Mountains. This study applies high-resolution cyclostratigraphy, inorganic carbon isotope geochemistry, and sequence stratigraphic concepts to test the hypothesis that the strata exposed at Plowman Ridge are equivalent to Grayburg strata exposed at the Shattuck Escarpment in the southern Guadalupe Mountains (Kerans and Nance 1991, Kerans and Kempter 2002). The shelf-to-basin cyclostratigraphic framework of the Grayburg Formation used in this study was established at the Shattuck Escarpment with data compiled from nine detailed measured sections, high-resolution photopans, and petrographic analysis. Based on one- and two-dimensional cycle stacking analysis, the Grayburg Formation was divided into three high-frequency sequences (HFSs). The high-frequency sequences contain transgressive systems tracts separated by maximum flooding surfaces from the highstand systems tracts. The Grayburg high-frequency sequences are composed of between 6 and 20 high-frequency cycles (HFCs), which were identified and classified into vertical facies successions. The Grayburg succession at Shattuck section 7 (32.09ᵒ, -104.81ᵒ) was selected as the reference section from the Guadalupe Mountains for comparison with Plowman section PR1 (32.03ᵒ, -104.89ᵒ) in the Brokeoff Mountains. Correlation between sections is documented at the 3rd-order composite sequence, high-frequency sequence, and when feasible, high-frequency cycle scale. Three high-frequency sequences recognized at Plowman Ridge section PR1 are equivalent to the G10, G11, and G12 Grayburg sequences described at Shattuck section 7. Correlation of the Grayburg G10-G12 high-frequency sequences with the three sequences at Plowman Ridge is based on comparison of overall thicknesses, facies proportions, cycle number, vertical facies succession, stratigraphic position of diagnostic units, and excursions within the inorganic carbon isotope profiles taken from both sections. Establishing the links between Grayburg strata on the Shattuck wall with strata on Plowman Ridge corroborates the framework/correlation scheme of Kerans and Tinker (1999) in lieu of other published correlation frameworks.text
Livres sur le sujet "Shelly ridges"
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Trimble, Marcia. Jonah's riddle. Los Altos Hills, Calif : Images Press, 2000.
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Scene of the Crime : Who Killed Shelly Sinclair ? : Scene of the Crime : Who Killed Shelly Sinclair ? / Blue Ridge Ricochet. Harlequin Mills & Boon, Limited, 2016.
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Shelby Foote, the Civil War, a narrative, vol. 8 : Tullahoma to Missionary Ridge. Brand : Time Life, 1999.
Trouver le texte intégralChapitres de livres sur le sujet "Shelly ridges"
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Welburn, Andrew J. « Riders in the Chariot ». Dans Power and Self-Consciousness in the Poetry of Shelley, 167–85. London : Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-18278-7_7.
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Sergienko, Elena, Svetlana Janson, Petr Kharitonskii, Kamil Gareev, Stepan Ilyin, Yaroslav Anoshin et Andrey Ralin. « Magnetic Properties and Composition of Inclusions in Foraminifera Shells at the Mid-Atlantic Ridge ». Dans Springer Proceedings in Earth and Environmental Sciences, 153–66. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-40470-2_9.
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Bella, Adrien, Noé Lahaye et Gilles Tissot. « Internal Tides Energy Transfers and Interactions with the Mesoscale Circulation in Two Contrasted Areas of the North Atlantic ». Dans Mathematics of Planet Earth, 1–16. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-40094-0_1.
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AbstractThe energy budget of the internal tide and its life cycle is investigated with a high resolution numerical simulation and a vertical normal mode decomposition. Two areas of interest are considered: the Azores Islands over the mid Atlantic ridge and the Gulf Stream offshore the North of the US East coast shelf break. Low mode (1 and 2) internal tides are found to propagate from 100 km (mode 2) to 1000 km (mode 1) away from their generation sites. Waves loose a significant portion of their energy as they propagate through the Gulf Stream, in contrast to the Azores domain. In the Gulf Stream domain, the mesoscale circulation is responsible for energy transfers from low to high modes internal tides, while the topographic scattering is dominant in the Azores area. This transfer of energy toward high modes favours energy dissipation. The mesoscale is significant in the energy budget of modes higher than mode 1 for both domains, and for all baroclinic modes in the Gulf Stream area. The internal tide is found to extract or loose energy toward the mesoscale circulation, but this accounts for less than 14%, of the energy scattered from low internal tide modes to higher ones once summed over all contributions of the modal energy budget.
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Taft, George, et Hideo Kagami. « Ridge Issues ». Dans Continental Shelf Limits. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195117820.003.0025.
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The Third United Nations Conference on the Law of the Sea sought to establish a definition of the continental shelf that would accommodate the interests of a number, albeit a minority, of coastal States. This included consideration of various submarine elevations, including ridges, and their relationship to the regime of the continental shelf. For a variety of reasons, submarine and oceanic ridges have proved to be contentious. Indeed, this chapter proved to be the most difficult of all the chapters in this book to obtain a text to which all the authors, scientists, and lawyers could agree. Therefore, rather than produce an anodyne chapter which might have summarized only those areas of agreement, we considered it best to also cover areas where agreement was lacking. This provides the reader with both sides of the argument and the opportunity to reach their own view on the basis of the evidence presented. Some of the contentious areas are . . . i. Whether or not article 76 should be interpreted in such a manner as to preclude a country situated on a ridge from having a continental shelf beyond 200 M. ii. Whether bathymetry (reflecting geomorphology) should be given more or less weight than, or the same weight as geology in any consideration of a continental shelf beyond 200 M, including extension along an oceanic ridge, iii. Whether the fact that article 76 refers to the continental shelf being a natural prolongation of the land territory "to the outer edge of the continental margin" means that it can (or cannot) be applied to an island sitting on top of an oceanic ridge, iv. Whether or not article 76 can be interpreted in such a way as to allow a coastal State to "jump" its claim from the margin onto an adjacent ridge. v. Whether or not article 76 limits the use of ridges so that coastal States do not unreasonably extend their continental shelf regime. . . . Ultimately, for the answers to these questions, the reader will need to look to the Commission on the Limits of the Continental Shelf (the Commission), together with the outcome of diplomacy.
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McGhee, Robert. « Vikings and Arctic Farmers : The Norse Atlantic Saga ». Dans The Last Imaginary Place, 74–101. Oxford University PressNew York, NY, 2006. http://dx.doi.org/10.1093/oso/9780192807304.003.0006.
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Abstract On a Warm and Cloudless August Afternoon the Viking ship Gaia approached the coast of North America.The huge sail pumped gently with a steady following breeze as the ship rode, lightly as a resting gull, across the ridges and valleys of a long northeasterly swell. Sunlight glinted from icebergs and flared on the distant spouts of whales.The grey cliffs of Newfoundland rose to starboard, and the foaming wake curled away towards Greenland.This tiny, fragile shell of wood had steered through fields of deadly ice, ridden over shoals that would have torn the bottom from a deeper ship, and passed through storms while taking no more than spray over the rails. Its crew was as confident and comfortable as if they were aboard a modern sailing yacht.
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« Shell Beach Ridge Landscape ». Dans Dictionary of Geotourism, 556. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2538-0_2210.
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Pluckhahn, Thomas J., et Victor D. Thompson. « New Centers Emerge (Phase 4) ». Dans New Histories of Village Life at Crystal River, 168–93. University Press of Florida, 2018. http://dx.doi.org/10.5744/florida/9781683400356.003.0007.
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Phase 4, the final phase of occupation at Crystal River and Roberts Island, started sometime between around AD 780 and 870 and ended between 900 and 980, spanning the transition between the Late Woodland period and Mississippian period, and the beginning of the Medieval Warm period. Occupation at the former site waned during this interval, while Roberts Island emerged as a major ceremonial center that included three small platform mounds tightly clustered around a small plaza. The pattern is reminiscent of earlier spatial layouts at Crystal River, but other features--such as linear ridges of shell and a water court--suggest greater influence from the Caloosahatchee tradition to the south. Isotopic studies of oyster shells from Roberts Island display less variability in habitat relative to those from earlier contexts, perhaps consistent with ownership of particular resource locations. Possibly, larger corporate groups (such as matrilineages) began working cooperatively to target specific resource locales that they owned and managed for themselves, to the exclusion of other such groups.
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Russell, Tony. « “Who Broke the Lock on the Hen-House Door?”/“She’ll Be Comin’ Round the Mountain When She Comes” ». Dans Rural Rhythm, 123–31. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190091187.003.0035.
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This chapter discusses H.M Barnes’ Blue Ridge Ramblers, “Who Broke the Lock on the Hen-House Door?”, “She’ll Be Comin’ Round the Mountain When She Comes”, stringband, vaudeville, representations of “hillbillies”
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« Red Snapper : Ecology and Fisheries in the U.S. Gulf of Mexico ». Dans Red Snapper : Ecology and Fisheries in the U.S. Gulf of Mexico, sous la direction de BERT W. GEARY, JOSEPH J. MIKULAS, JAY R. ROOKER, ANDRÉ M. LANDRY et TIMOTHY M. DELLAPENNA. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569971.ch3.
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<em>Abstract.</em>—Trawl surveys were conducted to measure patterns of habitat use by newly settled red snapper <em>Lutjanus campechanus </em>at three natural banks on the inner continental shelf of Texas. Digital side-scan sonar and multibeam bathymetric data were used to define inshore (mud), ridge (shell), and offshore (mud) habitats for Freeport Rocks, Heald Bank, and Sabine Bank. Otter trawls were conducted July through September in 2003 (Heald Bank, Sabine Bank) and in 2004 (Freeport Rocks) during the settlement period of red snapper. Freeport Rocks had markedly higher densities of red snapper (91 ha<sup>⁻1</sup>) in 2004 than Heald Bank (6 ha<sup>⁻1</sup>) or Sabine Bank (<1 ha<sup>⁻1</sup>) in 2003. A significant habitat effect was observed at Heald Bank and densities were higher at offshore mud habitats; no habitat effect was detected for Freeport Rocks or Sabine Bank. Growth rates varied from 0.86 mm‧d<sup>⁻1</sup> at Sabine Bank up to 1.12 mm‧d<sup>⁻1</sup> at Freeport Rocks, and rates were higher on inshore and offshore mud than ridge habitats. Otolith-based estimates of age indicated that settlers were first detected at 22–28 d and the majority of individuals were 30–60 d. Hatch dates peaked from early June to early July in both 2003 and 2004. Results from this study indicate that both shell and inshore and offshore mud habitats associated with these natural banks serve as settlement habitat of red snapper, and all three habitats have the potential to function as nursery areas of this species.
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Tillman, R. W., R. M. Martinsen, N. Gaynor et D. J. P. Swift. « SHANNON SHELF RIDGE SANDSTONES FIELD TRIP ». Dans Shelf Sands and Sandstone Reservoirs, 683–708. SEPM (Society for Sedimentary Geology), 1985. http://dx.doi.org/10.2110/scn.85.13.0683.
Texte intégralActes de conférences sur le sujet "Shelly ridges"
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Zhao, Weidong, Bernt Johan Leira, Knut Vilhelm Høyland, Ekaterina Kim, Guoqing Feng, Zhanyang Chen et Hongbin Gui. « On the Structural Analysis of Icebreakers Due to Ramming of First-Year Ice Ridges ». Dans ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79661.
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Abstract Sea ice ridges, formed by compression or shear in the ice cover, bring additional challenges to the structural safety of icebreakers navigating in polar regions. The purpose of this work is to carry out the structural analysis of an icebreaker during ramming of first-year ice ridges. A heavy icebreaker is chosen for the analysis, and the geometrical and physical properties of the ice ridge are determined based on empirical data. The ice ridge is modeled by solid elements deploying the continuous surface cap model (CSCM) with different materials’ parameters for the consolidated part and the unconsolidated part. Based on the numerical simulations of the ship-ridge interactions, the local ice-induced pressure on the hull shell is obtained. Subsequently, the local ice pressure is applied to local deformable sub-structural models of the heavy icebreaker. Subsequently, the ice-induced structural responses of the local sub-structural models are evaluated. Furthermore, the effect of model parameter settings related to the ice ridge on local ice pressures and structural responses are analyzed. Finally, the structural responses of the icebreaker navigating at the ship speed limit is also discussed.
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Chen, Tailian. « Thermal and Flow Characteristics in a Tube with Helical Ridges ». Dans ASME 2023 Heat Transfer Summer Conference collocated with the ASME 2023 17th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ht2023-106453.
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Abstract Use of tubes with helical ridges to make shell/tube heat exchangers has been an industry practice for many decades. However, understanding of thermal and flow characteristics with helical ridges is far from being sufficient. In this paper, thermal and flow characteristics of single-phase water flow in a cylindrical tube with spiral helical ridges is investigated to understand the enhancement in heat transfer and the associated penalty in the increased pressure drop. The experiments were conducted in the range of Reynolds number 3,700 to 75,000 and Prandtl number 3.8 to 10.0. The measurements show that thermal and flow characteristics are different from those reported in the literature for flow in commercial pipes with roughness. An analysis of friction factors measured in this work delineates the flow characteristics in a tube with helical ridges, which would help further explore the underlying physics. A comparison against the Moody chart and Churchill correlation indicates that the transition region covers a wider range of Reynolds number and extends into a much larger Reynolds number. It is postulated that the much wider transition region is attributed to helical ridges providing a channeling effect for the fluid flowing on the surface, which is absent for flow on a general rough surface. The heat transfer enhancements and the penalty of pressure drop measured in this work are further quantified and compared with suggested correlations available in the literature.
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Szabo´, Barna A., et Daniel E. Muntges. « Procedures for the Verification and Validation of Working Models for Structural Shells ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60014.
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Verification of computed data and validation of mathematical models for structural shells with reference to particular applications and goals of computation are discussed and illustrated through the example of a cylinder-to-cylinder intersection problem investigated experimentally and analytically at Oak Ridge National Laboratory.
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Rasyid, F. ,. N. « Integrated Sedimentology Characters and Seismic Geomorphology for Reservoir Prediction of Tidal Shelf Ridge : The Upper Cibulakan Formation As A Shallow Marine Reservoir Analogue ». Dans Digital Technical Conference. Indonesian Petroleum Association, 2020. http://dx.doi.org/10.29118/ipa20-sg-176.
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The Upper Cibulakan Formation is one of the main reservoirs in the Offshore North West Java Basin. It was deposited in a shallow marine environment with Tidal Shelf Ridge morphology. Sedimentology and seismic approaches are integrated in this study to understand lithofacies, depositional stages and morphological patterns of Tidal Shelf Ridge. The study is restricted to Zone 29, P-Field with available data being 5 wells data that have cores, 64 well data, and 3D seismic data. The lithofacies data of these wells is integrated with log data using a Multi Resolution Graph-based Clustering (MRGC) method to predict the lithofacies and depositional stage of other wells without core. There are 10 different lithofacies and 4 facies association identified from these well cores. Facies associations that were found refer to nomenclature of depositional stage of Tidal Shelf Ridge. The embryonic stage consists of claystone-siltstone or calcareous highly-cemented sandstone (with erosional contact), which is the stage of beginning of deposition of the shelf ridge. The immature accretion stage consists of siltstone and sandstone with an intense heterolithic structure. The mature accretion stage consists of sandstone with little or no appearance of heterollitic structure. The abandonment stage is the final stage of shelf ridge that consist of calcareous highly-cemented sandstone without erosional contact. Stratigraphic pattern based on vertical order of facies association is showing 5 transgressive parasequence tracts bounded by 6 flooding surface markers. Based on seismic attributes, which is an average of amplitude x thickness in parasequence, the pattern and morphology of tidal shelf ridge body is relatively northeast – southwest direction. The results of this study are expected to be a reference in developing more advanced hydrocarbon production by understanding of the morphology of reservoir body.
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Li, Wei. « Experimental Studies of Shell and Tube Condenser Fouling and Accelerated Particulate Fouling in Internal Helical-Rib Roughness Tubes ». Dans ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47404.
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This paper addresses fouling in a family of seven 15.54 mm I.D. copper, helically ribbed tubes, which have different ridge heights, helix angles, and number of ridge starts. A series of semi-theoretical linear fouling correlations as a function of the product of area indexes and efficiency indexes for long term combined precipitation and particulate fouling (PPF) in cooling tower systems and a series of semi-theoretical linear fouling correlations as a function of the efficiency indexes for particulate fouling were developed. The correlations can be directly used to assess the fouling potential of enhanced tubes in actual cooling water situations.
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Tomutsa, L., S. R. Jackson, M. Szpakiewicz et T. Palmer. « Geostatistical Characterization and Comparison of Outcrop and Subsurface Facies : Shannon Shelf Sand Ridges ». Dans SPE California Regional Meeting. Society of Petroleum Engineers, 1986. http://dx.doi.org/10.2118/15127-ms.
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DURÁN, RUTH, JORGE GUILLÉN, GONZALO SIMARRO, MARTA RIBÓ, PERE PUIG, ARACELI MUÑOZ et ALBERT PALANQUES. « SAND RIDGES IN THE MID-OUTER SHELF AS POTENTIAL SAND BORROWS AREAS (NW MEDITERRANEAN) ». Dans Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0111.
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Stevens, Gary L., Mark T. Kirk et Terry Dickson. « Probabilistic Fracture Mechanics Evaluations That Consider Nozzles in the Extended Beltline Region of Reactor Pressure Vessels ». Dans ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45065.
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For many years, ASME Section XI committees have discussed the assessment of nozzle penetrations in various flaw evaluations for reactor pressure vessels (RPVs). As summarized in Reference [1], linear elastic fracture mechanics (LEFM) solutions for nozzle penetrations have been in use since the 1970s. In 2013, one of these solutions was adopted into ASME Code, Section XI, Nonmandatory Appendix G (ASME App. G) [2] for use in developing RPV pressure-temperature (P-T) operating limits. That change to ASME App. G was based on compilation of past work [3] and additional evaluations of fracture driving force [4][5]. To establish the P-T limits on RPV operation, consideration should be given to both the RPV shell material with the highest reference temperature as well as regions of the RPV (e.g., nozzles, flange) that contain structural discontinuities. In October 2014, the U.S. Nuclear Regulatory Commission (NRC) highlighted these requirements in Regulatory Issue Summary (RIS) 2014-11 [6]. Probabilistic fracture mechanics (PFM) analyses performed to support pressurized thermal shock (PTS) evaluations using the Fracture Analysis Vessels Oak Ridge (FAVOR) computer code [7] currently evaluate only the RPV beltline shell regions. These evaluations are based on the assumption that the PFM results are controlled by the higher embrittlement characteristic of the shell region rather than the stress concentration characteristic of the nozzle, which does not experience nearly the embrittlement of the shell due to its greater distance from the core. To evaluate this assumption, the NRC and the Oak Ridge National Laboratory (ORNL) performed PFM analyses to quantify the effect of these stress concentrations on the results of the RPV PFM analyses. This paper summarizes the methods and evaluates the results of these analyses.
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Hu, S. D., H. Li et H. S. Tzou. « Spatial Actuation Effectiveness of Segmented Actuators on Parabolic Cylindrical Panels ». Dans ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87210.
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With the distinct capability of line-focusing, open parabolic cylindrical panels are commonly used as key components of radar antennas, space reflectors, solar collectors, etc. These structures suffer unexpected vibrations from the fluctuation of base structure, non-uniform heating and air flow. The unwanted vibration will reduce the surface reflecting precision and even result in structure damages. To explore active vibration and shape control of parabolic cylindrical panels, this study focuses on actuation effectiveness induced by segmented piezoelectric patches laminated on a flexible parabolic cylindrical panel. The mathematical model of a parabolic cylindrical panel laminated with distributed actuators is formulated. The segmentation technique is developed and applied to parabolic cylindrical panels, and the piezoelectric layer is segmented uniformly in the meridional direction. The distributed actuator patches induced modal control forces are evaluated. As the area of actuator patch varies in the meridional direction, modal control force divided by actuator area, i.e., actuation effectiveness, is investigated. Spatial actuation effectiveness, including its membrane and bending components are evaluated with respect to design parameters: actuator size and position, shell curvature, shell thickness and vibration mode in case studies. The actuation component induced by the membrane force in the meridional direction mainly contributes to the total actuation effectiveness for lower modes. Average and cancellation effect of various actuator sizes and the optimal actuator position are also discussed. Results suggest that for odd vibration modes, the maximal actuation effectiveness locates at the ridge of the panel; while for even modes, the peak/valley closest to the ridge is the optimal position to obtain the maximal actuation effectiveness. A segmentation scheme of the meridian interval angle 0.0464rad for the investigated standard panel is a preferred tradeoff between the actuation effectiveness and practical feasibility. The modal actuation effectiveness increases with the shell curvature, whereas decreases when the shell thickens.
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Xie, Wenjun, Qing Liu, Yanyun Zhao, Jiangbao Xia, Jingkuan Sun et Jiayi Tian. « Notice of Retraction : Vegetation Distribution Characteristics and Shell Sand Physicochemical Properties in Shell Ridge on the Southwestern Coast of Bohai Bay ». Dans 2011 5th International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5781559.
Texte intégralRapports d'organisations sur le sujet "Shelly ridges"
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Restrepo, J. M., et J. L. Bona. Model for the formation of longshore sand ridges on the continental shelf. Office of Scientific and Technical Information (OSTI), janvier 1994. http://dx.doi.org/10.2172/205053.
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Li, M. Z., E. L. King et C. Smyth. Morphology and stability of sand ridges on Sable Island Bank, Scotian Shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/214887.
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King, E. L., A. Normandeau, T. Carson, P. Fraser, C. Staniforth, A. Limoges, B. MacDonald, F. J. Murrillo-Perez et N. Van Nieuwenhove. Pockmarks, a paleo fluid efflux event, glacial meltwater channels, sponge colonies, and trawling impacts in Emerald Basin, Scotian Shelf : autonomous underwater vehicle surveys, William Kennedy 2022011 cruise report. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331174.
Texte intégralRésumé :
A short but productive cruise aboard RV William Kennedy tested various new field equipment near Halifax (port of departure and return) but also in areas that could also benefit science understanding. The GSC-A Gavia Autonomous Underwater Vehicle equipped with bathymetric, sidescan and sub-bottom profiler was successfully deployed for the first time on Scotian Shelf science targets. It surveyed three small areas: two across known benthic sponge, Vazella (Russian Hat) within a DFO-directed trawling closure area on the SE flank of Sambro Bank, bordering Emerald Basin, and one across known pockmarks, eroded cone-shaped depression in soft mud due to fluid efflux. The sponge study sites (~ 150 170 m water depth) were known to lie in an area of till (subglacial diamict) exposure at the seabed. The AUV data identified gravel and cobble-rich seabed, registering individual clasts at 35 cm gridded resolution. A subtle variation in seabed texture is recognized in sidescan images, from cobble-rich on ridge crests and flanks, to limited mud-rich sediment in intervening troughs. Correlation between seabed topography and texture with the (previously collected) Vazella distribution along two transects is not straightforward. However there may be a preference for the sponge in the depressions, some of which have a thin but possibly ephemeral sediment cover. Both sponge study sites depict a hereto unknown morphology, carved in glacial deposits, consisting of a series of discontinuous ridges interpreted to be generated by erosion in multiple, continuous, meandering and cross-cutting channels. The morphology is identical to glacial Nye, or mp;lt;"N-mp;lt;"channels, cut by sub-glacial meltwater. However their scale (10 to 100 times mp;lt;"typicalmp;gt;" N-channels) and the unique eroded medium, (till rather than bedrock), presents a rare or unknown size and medium and suggests a continuum in sub-glacial meltwater channels between much larger tunnel valleys, common to the eastward, and the bedrock forms. A comparison is made with coastal Nova Scotia forms in bedrock. The Emerald Basin AUV site, targeting pockmarks was in ~260 to 270 m water depth and imaged eight large and one small pockmark. The main aim was to investigate possible recent or continuous fluid flux activity in light of ocean acidification or greenhouse gas contribution; most accounts to date suggested inactivity. While a lack of common attributes marking activity is confirmed, creep or rotational flank failure is recognized, as is a depletion of buried diffuse methane immediately below the seabed features. Discovery of a second, buried, pockmark horizon, with smaller but more numerous erosive cones and no spatial correlation to the buried diffuse gas or the seabed pockmarks, indicates a paleo-event of fluid or gas efflux; general timing and possible mechanisms are suggested. The basinal survey also registered numerous otter board trawl marks cutting the surficial mud from past fishing activity. The AUV data present a unique dataset for follow-up quantification of the disturbance. Recent realization that this may play a significant role in ocean acidification on a global scale can benefit from such disturbance quantification. The new pole-mounted sub-bottom profiler collected high quality data, enabling correlation of recently recognized till ridges exposed at the seabed as they become buried across the flank and base of the basin. These, along with the Nye channels, will help reconstruct glacial behavior and flow patterns which to date are only vaguely documented. Several cores provide the potential for stratigraphic dating of key horizons and will augment Holocene environmental history investigations by a Dalhousie University student. In summary, several unique features have been identified, providing sufficient field data for further compilation, analysis and follow-up publications.
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Restrepo, J. M., et J. L. Bona. Model for the Formation and Evolution of Sand Ridges on the Continental Shelf. Fort Belvoir, VA : Defense Technical Information Center, octobre 1992. http://dx.doi.org/10.21236/ada256618.
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Restrepo, J. M., et J. L. Bona. Model for the formation of longshore sand ridges on the Continental Shelf : The interaction of internal waves and the bottom topography. Office of Scientific and Technical Information (OSTI), janvier 1994. http://dx.doi.org/10.2172/211593.
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Seamount, Dan, et R. M. Bustin. Vitrinite reflectance analyses for Cook Inlet well cuttings from the following : Shell Oil Company Kustatan Ridge #1, Shell Oil Company Middle River State #1, Superior Oil Three Mile Creek State #1, Texas International Pet. Corp. Pretty Creek State #1. Alaska Division of Geological & Geophysical Surveys, 1998. http://dx.doi.org/10.14509/19124.
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40Ar/39Ar Geochronology Results for the Black Ridge, Circleville Canyon, Government Point, Marysvale Canyon, and Shelly Baldy Peak Quadrangles, Marysvale Volcanic Field, Utah. Utah Geological Survey, octobre 2019. http://dx.doi.org/10.34191/ofr-705.
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Modeling Cape- and Ridge-Associated Marine Sand Deposits ; A Focus on the U.S. Atlantic Continental Shelf. US Geological Survey, 2009. http://dx.doi.org/10.3133/b2209m.
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Mineral Resource Assessment of Marine Sand Resources in Cape- and Ridge-Associated Marine Sand Deposits in Three Tracts, New York and New Jersey, United States Atlantic Continental Shelf. US Geological Survey, 2009. http://dx.doi.org/10.3133/b2209n.
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