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McMaster University
1.
Skipper, Keith.
Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec.
Degree: MSc, 1970, McMaster University
URL: http://hdl.handle.net/11375/20174 
► Thick turbidite beds, belonging to the β1 member, Cloridorme Formation (Ordovician), are exposed on the wavecut platform between St. Hélier and Fame Point, Gaspé,…
(more)
▼ Thick turbidite beds, belonging to the β1 member, Cloridorme Formation (Ordovician), are exposed on the wavecut platform between St. Hélier and Fame Point, Gaspé, Quebec. The local paleocurrent direction (to the west) is approximately parallel to the east-west strike of the vertical beds. These thick turbidite beds display a sequence of sedimentary
structures which differs from the sequence defined by Bouma. Three broad divisions are recognised: a basal division consists of either limestone or quartz granule to pebble conglomerate (0-4 cms thick) or coarse sand greywacke or calcareous wacke (0-15 cms thick).
Basal divisions of calcareous wacke frequently display ripple-lamination, parallel lamination, or upstream inclined laminae. Where the upstream inclined laminae form a single set, they occur below a sinuous profile (wavelength 40-80 cms, and amplitude 2-5 cms). A second division (0-330 cms thick) consists in most places of spindle or globular shaped calcareous nodules scattered in an argillaceous matrix. In some beds streaking and lobing of light coloured carbonate bearing material is associated with these nodules. The upper division consists of fine grained siltstone and shale. Thick broken blocks which have fallen from the cliffs, display the internal characteristics of the second division. Hemi-ellipsoid
structures, arranged en echelon and convex towards the base of the bed, are displayed by one block. The upstream inclined laminae in the basal divisions of calcareous wacke beds are interpreted as the result of the upstream migration of antidunes. The nodules within the second division developed as 'pseudonodules'. The hemi-ellipsoid structures resemble damped
large scale (macroturbulent) eddies associated with the flow of dense grain dispersions. The directions of the internal motions are shown by the orientation of grains and graptolite stipes. Correlation of these beds has been achieved over a distance of 7-1/2 miles. Over this distance the beds show little change in their characteristics. Basal divisions of granule and pebble conglomerate persist over this distance and show that coarse particles may be transported by turbidity currents over long distances. The sedimentary structures of the basal divisions of several calcareous wacke beds give the appearance (probably misleading) of an increase in flow regime downcurrent. The beds were probably deposited from initially low concentration but high density turbidity currents accompanied by a period of coarse grain traction and suspension near to the bed. In the case of calcareous wacke beds this period of traction formed rippled, flat or antidune bed forms. Stratification has been preserved by the rapid deposition of sediment en masse from the subsequent high concentration body of the current. The formation of a succession of 'quick' beds led to the sedimentation of the second division. Calculations suggest that the currents moved over slopes of much less than 1°.
Thesis
Master of…
Advisors/Committee Members: Middleton, G. V., Geology.
Subjects/Keywords: depositional mechanics; atypical; turbidites; cloridorme formation; sediment; laminae
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APA (6th Edition):
Skipper, K. (1970). Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/20174
Chicago Manual of Style (16th Edition):
Skipper, Keith. “Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec.” 1970. Masters Thesis, McMaster University. Accessed March 07, 2021.
http://hdl.handle.net/11375/20174.
MLA Handbook (7th Edition):
Skipper, Keith. “Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec.” 1970. Web. 07 Mar 2021.
Vancouver:
Skipper K. Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec. [Internet] [Masters thesis]. McMaster University; 1970. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/11375/20174.
Council of Science Editors:
Skipper K. Depositional Mechanics of Atypical Turbidites, Cloridorme Formation, Gaspé, Quebec. [Masters Thesis]. McMaster University; 1970. Available from: http://hdl.handle.net/11375/20174
Iowa State University
2.
Cerfogli, Jennifer Anne.
biomechanical considerations in equine laminitis.
Degree: 2009, Iowa State University
URL: https://lib.dr.iastate.edu/etd/10847
► This thesis offers a contemporary review of the biomechanics involved in the disease of equine laminitis with respect to the methods of prevention and treatment.…
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▼ This thesis offers a contemporary review of the biomechanics involved in the disease of equine laminitis with respect to the methods of prevention and treatment. It begins with an introduction of the anatomy of the equine foot and how that anatomy serves a biomechanical purpose. An emphasis on the forces acting on a normal equine foot is presented with respect to different periods of the stance phase. The reaction of the internal structures of the foot to impact shocks and weightbearing is also outlined. Using the most current data, a generalized overview of laminitis follows and each of the four distinct phases are covered in detail. Known risk factors for laminitis and identified epidemiologic trends as well as economic impact are presented. Laminitis is examined from a biomechanical perspective and how normal biomechanical forces may affect prognosis. The scientific literature review specifically relates to the biomechanical effects of current methods of laminitis prevention and treatment. A scientific journal manuscript is presented and outlines a study evaluating the center of pressure and load distribution in a population of normal horses utilizing a common, but unsubstantiated, treatment for acute laminitis.
Subjects/Keywords: biomechanics; equine; inverse dynamics; laminae; laminitis; Veterinary Medicine
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APA (6th Edition):
Cerfogli, J. A. (2009). biomechanical considerations in equine laminitis. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10847
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cerfogli, Jennifer Anne. “biomechanical considerations in equine laminitis.” 2009. Thesis, Iowa State University. Accessed March 07, 2021.
https://lib.dr.iastate.edu/etd/10847.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cerfogli, Jennifer Anne. “biomechanical considerations in equine laminitis.” 2009. Web. 07 Mar 2021.
Vancouver:
Cerfogli JA. biomechanical considerations in equine laminitis. [Internet] [Thesis]. Iowa State University; 2009. [cited 2021 Mar 07].
Available from: https://lib.dr.iastate.edu/etd/10847.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cerfogli JA. biomechanical considerations in equine laminitis. [Thesis]. Iowa State University; 2009. Available from: https://lib.dr.iastate.edu/etd/10847
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Howe, Timothy S.
Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.
Degree: 2015, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/3264
► The upper Gowganda Formation of the Huronian Supergroup contains glacially-induced, varve-like rhythmites composed of turbiditic micro-laminae that potentially preserve a detailed record of climatic conditions…
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▼ The upper Gowganda Formation of the Huronian Supergroup contains glacially-induced, varve-like rhythmites composed of turbiditic micro-laminae that potentially preserve a detailed record of climatic conditions during the Paleoproterozoic Era. A sedimentological analysis of upper Gowganda Formation deposits enabled identification of eight lithofacies comprising a glaciogenic depositional environment: 1) diamictite, 2) contorted argillite, 3) interlaminated siltstone and sandstone, 4) interbedded siltstone and claystone, 5) sandstone, 6) siltstone, 7) interbedded coarse-grained and fine-grained siltstone, and 8) wavy argillite. Major, trace, and rare earth element analyses indicate that the rhythmites have undergone limited recycling and chemical alteration. Whole-rock δ18O values are consistent with an Archean gneiss provenance and support that chemical weathering and diagenesis were insignificant. Spectral analysis of four rhythmic couplet thickness records using the MTM Toolkit of Mann and Lees (1996) supports the hypothesis of annual deposition for the rhythmites.
Subjects/Keywords: Paleoproterozoic; Huronian; glaciation; rhythmites; varves; micro-laminae; Geology
…43
Figure 3-8: A: Micro-laminae in claystone (clst) layers in the lower section… …layers of
siltstone (slst) that separate individual lamina. Siltstone micro-laminae… …are separated by
thin claystone layers. B: Micro-laminae in the fine-grained siltstone (… …separate individual fine-grained siltstone
lamina. C, D: Micro-laminae in claystone layers in the… …laminae. Thicker siltstone laminae
ix
dividing claystone layers were observed locally…
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APA (6th Edition):
Howe, T. S. (2015). Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3264
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Howe, Timothy S. “Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.” 2015. Thesis, University of Western Ontario. Accessed March 07, 2021.
https://ir.lib.uwo.ca/etd/3264.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Howe, Timothy S. “Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.” 2015. Web. 07 Mar 2021.
Vancouver:
Howe TS. Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Mar 07].
Available from: https://ir.lib.uwo.ca/etd/3264.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Howe TS. Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/3264
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
4.
Chutko, Krystopher John.
Sedimentary structural indicators of Arctic terrestrial and aquatic processes
.
Degree: Geography, 2008, Queens University
URL: http://hdl.handle.net/1974/1220
► Annually and subannually laminated lacustrine sediments potentially contain a wide range of information that can be interpreted for paleoenvironmental reconstructions. These laminae are produced by…
(more)
▼ Annually and subannually laminated lacustrine sediments potentially contain a wide range of information that can be interpreted for paleoenvironmental reconstructions. These laminae are produced by the physical and biological processes that operate in the lake and in the surrounding terrestrial environment. However, identification of the influences that control laminae production may not be straightforward, and other processes may subtly influence the overall depositional sequence. This thesis examines two different depositional environments on Colin Archer Peninsula, Devon Island, Canada, with the objective of identifying the factors that influence subannual sediment deposition and how the resultant sedimentary structures can be used as indicators of paleoenvironmental conditions.
In proglacial Lake R, clastic sediment deposition is controlled primarily by subannual meteorological conditions. Periods of positive air temperature or large rainfall events produce discernable laminae that, when combined, form a varve sequence. However, overarching geomorphic controls influence the delivery of sediment to the lake and may reduce or enhance the hydrometeorological signal contained in the varves.
An additional influence for calibration of the varve record to meteorological observations is the role that melt season thermal inversions have on temperature extrapolation in the High Arctic. Meteorological stations at sea level may not be representative of the surrounding region, thereby reducing the accuracy of vertical temperature estimation. Investigation of the inversions in the central Canadian High Arctic demonstrated that melt season inversions are common and increased inversion frequency may potentially have influenced enhanced glacial melt since the late 1980s, with implications for proglacial lake sediment transport and deposition.
In coastal Lake J, late Holocene sediments record a relatively unusual accumulation of microbially induced sedimentary structures (MISS). Such a record has not been previously described in the circum-Arctic, although they are known to exist elsewhere. These sediments are produced by the interaction between clastic sedimentation and cyanobacterial growth and production. Although chronological constraint could not be assigned with certainty to the record, statistical study of the laminated sequence suggested a dominant pattern that is plausibly annual. A heuristic model of annual sediment accumulation was developed in order to explore the potential for quasi-annual paleoenvironmental interpretations.
Subjects/Keywords: Lacustrine sediment
;
Varves
;
Microbially induced sedimentary structures
;
Arctic
;
Thermal inversion
;
Subannual laminae
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APA ·
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Manager
APA (6th Edition):
Chutko, K. J. (2008). Sedimentary structural indicators of Arctic terrestrial and aquatic processes
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/1220
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chutko, Krystopher John. “Sedimentary structural indicators of Arctic terrestrial and aquatic processes
.” 2008. Thesis, Queens University. Accessed March 07, 2021.
http://hdl.handle.net/1974/1220.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chutko, Krystopher John. “Sedimentary structural indicators of Arctic terrestrial and aquatic processes
.” 2008. Web. 07 Mar 2021.
Vancouver:
Chutko KJ. Sedimentary structural indicators of Arctic terrestrial and aquatic processes
. [Internet] [Thesis]. Queens University; 2008. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1974/1220.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chutko KJ. Sedimentary structural indicators of Arctic terrestrial and aquatic processes
. [Thesis]. Queens University; 2008. Available from: http://hdl.handle.net/1974/1220
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
5.
Naik, G Narayana.
Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion.
Degree: PhD, Faculty of Enginering, 2009, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/469
► In recent years, use of composites is increasing in most fields of engineering such as aerospace, automotive, civil construction, marine, prosthetics, etc., because of its…
(more)
▼ In recent years, use of composites is increasing in most fields of engineering such as aerospace, automotive, civil construction, marine, prosthetics, etc., because of its light weight, very high specific strength and stiffness, corrosion resistance, high thermal resistance etc. It can be seen that the specific strength of fibers are many orders more compared to metals. Thus, laminated fiber reinforced plastics have emerged to be attractive materials for many engineering applications. Though the uses of composites are enormous, there is always an element of fuzziness in the design of composites. Composite structures are required to be designed to resist high stresses. For this, one requires a reliable failure criterion. The anisotropic behaviour of composites makes it very difficult to formulate failure criteria and experimentally verify it, which require one to perform necessary bi-axial tests and plot the failure envelopes. Failure criteria are usually based on certain assumption, which are some times questionable. This is because, the failure process in composites is quite complex. The failure in a composite is normally based on initiating failure mechanisms such as fiber breaks, fiber compressive failure, matrix cracks, matrix crushing, delamination, disbonds or a combination of these. The initiating failure mechanism is the one, which is/are responsible for initiating failure in a laminated composites. Initiating failure mechanisms are generally dependant on the type of loading, geometry, material properties, condition of manufacture, boundary conditions, weather conditions etc. Since, composite materials exhibit directional properties, their applications and failure conditions should be properly examined and in addition to this, robust computational tools have to be exploited for the design of structural components for efficient utilisation of these materials.
Design of structural components requires reliable failure criteria for the safe design of the components. Several failure criteria are available for the design of composite laminates. None of the available anisotropic strength criteria represents observed results sufficiently accurate to be employed confidently by itself in design. Most of the failure criteria are validated based on the available uniaxial test data, whereas, in practical situations, laminates are subjected to at least biaxial states of stresses. Since, the generation of biaxial test data are very difficult and time consuming to obtain, it is indeed a necessity to develop computational tools for modelling the biaxial behavior of the composite laminates. Understanding of the initiating failure mechanisms and the development of reliable failure criteria is an essential prerequisite for effective utilization of composite materials. Most of the failure criteria, considers the uniaxial test data with constant shear stress to develop failure envelopes, but in reality, structures are subjected to biaxial normal stresses as well as shear stresses. Hence, one can develop different failure…
Advisors/Committee Members: Krishna Murty, A V (advisor).
Subjects/Keywords: Structural Analysis; Laminated Composites; Composites - Design Optimization; Failure Mechanism Based Failure Criterion; Composite Laminates - Failure Mechanism Based Design; Vector Evaluated Particle Swarm Optimization; Genetic Algorithms; Composite Laminates; Composite Laminae; Composite Structures; Design Optimization; Failure Criterion; Structural Engineering
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Naik, G. N. (2009). Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/469
Chicago Manual of Style (16th Edition):
Naik, G Narayana. “Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion.” 2009. Doctoral Dissertation, Indian Institute of Science. Accessed March 07, 2021.
http://etd.iisc.ac.in/handle/2005/469.
MLA Handbook (7th Edition):
Naik, G Narayana. “Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion.” 2009. Web. 07 Mar 2021.
Vancouver:
Naik GN. Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2009. [cited 2021 Mar 07].
Available from: http://etd.iisc.ac.in/handle/2005/469.
Council of Science Editors:
Naik GN. Development And Design Optimization Of Laminated Composite Structures Using Failure Mechanism Based Failure Criterion. [Doctoral Dissertation]. Indian Institute of Science; 2009. Available from: http://etd.iisc.ac.in/handle/2005/469
. 
Open Access Theses and Dissertations
