17 resultados para rock powder
em Brock University, Canada
Resumo:
Microbial ichnofossils in volcanic rocks provide a significant record of subsurface microbes and potentially extraterrestrial biosignatures. Here, the textures, mineralogy, and geochemistry of two continental basaltic hydrovolcanic deposits - Reed Rocks and Black Hills - in the Fort Rock Volcanic Field (FRVF) are investigated. Methods include petrographic microscopy, micro and powder X-ray diffraction, SEM/BSE/EDF imaging, energy dispersive spectroscopy, stable isotopes, and X-ray fluorescence. Petrographic analysis revealed granular and tubular textures with biogenic morphologies that include terminal enlargements, septate divisions, branching forms, spiral filaments, and ovoid bodies resembling endolithic microborings described in ocean basalts. They display evidence of behaviour and a geologic context expressing their relative age and syngenicity. Differences in abiotic alteration and the abundance/morphotype assemblage of putative microborings between the sites indicate that water/rock ratio, fluid composition and flux, temperature and secondary phase formation are influences on microboring formation. This study is the first report of reputed endolithic microborings in basalts erupted in a continental lacustrine setting.
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Part of Brock's first ever all female crew.
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Frank Reynolds was in charge of the Rock at Brock featuring the Guess Who and 7 other Canadian Bands, held on the back field at Brock. It was a geat affair, with 40,000 in attendance and few incidents. The student union rented every bus the City of St Catharines owned and took everyone home at 1 AM when the event ended.
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There were three purposes to this study. The first purpose was to determine how learning can be influenced by various factors i~ the rock climbing experience. The second purpose was to examine what people can learn from the rock climbing experience. The third purpose was to investigate whether that learning can transfer from the rock climbing experience to the subjects' real life in the workplace. Ninety employees from a financial corporation in the Niagara Region volunteered for this study. All subjects were surveyed throughout a one-day treatment. Ten were purposefully selected one month later for interviews. Ten themes emerged from the subjects in terms of what was learned. Inspiration, motivation, and determination, preparation, goals and limitations, perceptions and expectations, confidence and risk taking, trust and support, teamwork, feedback and encouragement, learning from failure, and finally, skills and flow. All participants were able to transfer what was learned back to the workplace. The results of this study suggested that subjects' learning was influenced by their ability to: take risks in a safe environment, fail without penalty, support each other, plan without time constraints, and enjoy the company of fellow workers that they wouldn't normally associate with. Future directions for research should include different types of treatments such as white water rafting, sky diving, tall ship sailing, or caving.
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The endocrine pancreas of the rock bass (Ambloplites rupestris) was examined by light and electron microscopy. Two cell types with staining properties similar to mammalian A and B cells, and a third, non-staining cell type were found in the spherical pancreatic islets that were surrounded by a connective tissue capsule and embedded in two small masses of exocrine tissue. From an analysis of the ultrastructure of the A and B cells, a secretory cycle for each of these cell types was proposed. The secretory cycle of the A cell consisted of three well defined stages: (1) A cell production stage: during which A granule formation occurred in the sacs of the Golgi apparatus and the cell was characterized by the presence of numerous secretory granules, some elements of lamellar endoplasmic reticulum, and a homogeneously granular nucleus. The cytoplasm contained few distended cisternae, variable numbers of free ribosomes, microtubules and small vesicles. (2) A cell release stage: during which the release of A granules occurred and the cell usually contained several large distended cisternae and variable numbers of secretory granules. Granule release mechanisms included exocytosis, by which individual granules were released into the extracellular space after their membranes fused with the plasmalemma, and emiocytosis, by which one or more granules were released into a large cisterna whose membrane fused with the plasmalemma and formed a pore through which the cisternal contents passed out of the cell. (3) A cell reorganization stage: during which the changeover from the release stage to the production stage occurred and the reorganization of organelles and membrane structures took place. The cell contained few secretory granules and numerous small endoplasmic reticular cisternae. The cytoplasm exhibited less electron density than either of the other two stages. The A granule after formation underwent a series of morphological changes which were described in four numerically identified phases. The secretory cycle of the B cell consisred of two stages: (1) B cell production stage: during which the B granule formation occurred in the sacs of the Go1gi apparatus. The cell was characterized by an irregular outline, the presence of numerous secretory granules, and an irregularly shaped nucleus which contained variable amounts of clumped chromatin. The cytoplasm contained moderate amounts of lamellar endoplasmic reticulum studded with ribosomes, several small vesicles, and an active Go1gi apparatus. (2) B cell release stage: during which the release of B granules occurred. The cell contained a rounded nucleus with dispersed chromatin, several distended endoplasmic reticular cisternae and a variable number of secretory granules. Granule release occu~ by emiocytosis and exocytosis similar to that found for the A cell.
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Using the energy dispersive x ...ray diffraction (EDXD) technique, the room temperature diffraction pattern of Al powder was obtained at diffraction angles ~ 30° and 50°. From the small angle diffraction pattern the average relative intensities (IR) of the (111), (200), and (220) lines were measured to be equal to 100, 62, and 32 respectively. From the large diffraction angle IR for the (220), (311+222), (400), (331+420), and (422) lines were measured to be 100,201,17,90, and 19.5 respectively. The diffraction pattern at those two angles were obtained at several higher temperatures to measure the change in the intensities of the Al lines. From the intensity changes the increase of the Debye- Waller temperature factor, i.e ~B(T), with respect to the value at room temperature was determined to be 0.6+0.1 at 250°C, 1.10+0.15 at 350°C, 1.45+0.20 at 450°C, and 2.20±0.35 at 550°C.
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Mathematical predictions of flow conditions along a steep gradient rock bedded stream are examined. Stream gage discharge data and Manning's Equation are used to calculate alternative velocities, and subsequently Froude Numbers, assuming varying values of velocity coefficient, full depth or depth adjusted for vertical flow separation. Comparison of the results with photos show that Froude Numbers calculated from velocities derived from Manning's Equation, assuming a velocity coefficient of 1.30 and full depth, most accurately predict flow conditions, when supercritical flow is defined as Froude Number values above 0.84. Calculated Froude Number values between 0.8 and 1.1 correlate well with observed transitional flow, defined as the first appearance of small diagonal waves. Transitions from subcritical through transitional to clearly supercritical flow are predictable. Froude Number contour maps reveal a sinuous rise and fall of values reminiscent of pool riffle energy distribution.
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Three cores from the Kearl Lake Oil Sands area within the Athabasca deposit of northeastern Alberta have been analyzed to understand the thermal history of the McMurray and Clearwater formations of the Lower Cretaceous Mannville Group. The approach involves the integration of vitrinite reflectance (VR), Rock-Eval pyrolysis, fluorescence microscopy, and palynology. Mean VR varies between 0.21 and 0.43% Ro and indicates thermally immature levels equivalent to the rank of lignite to sub-bituminous coal. Although differing lithologies have influenced VR to some extent (i.e., coals and bitumen-rich zones), groundwater influence and oxidation seem not to have measurably altered YR. Rock-Eval analysis points to Type III/IV kerogen, and samples rich in amorphous organic matter (ADM) show little to no fluorescence characteristics, implying a terrestrial source of origin. Palynology reveals the presence of some delicate macerals but lack of fluorescence and abundant ADM suggests some degradation and partial oxidation of the samples.
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Transcript [original spelling and grammar retained]: Sacketts Harbour 26th Sept. 1813. Dear wife. From this you are informed that I am in health at this Date. When I last wrote to you I some expected to go upon and expedition but to us unknown we sat out and went up the Lake 3 Days Landed at Oswego The British Fleet appeared off, and we returned and saw our fleet upon our return, I think that our Regt. going was only a maneuver to get the Fleet out that our Fleet might come a threat[?] of them We expect to embark immediately into Canada as preparations are making to convey us over to them we are anxious to commence an action with them. Troops are daily coming in to the Harbour to take the Stand in our absence, we shall not be here 3 days before we try their[?] Powder. they are daily defecting[?] to us from Canada very fearful of the consequence of our Resisting[?] of them…our Fleet is now out and has been for 6 or 7 days. The Lake Erie fleet has done great things. I hope ours will be as successful. I think that our Generals are waiting to hear from them as every thing is ready[?] of to embark various opinions reflecting were we shall attack them some say at Kingston others at Montreal and others at Prescot—Mr. William Butler and D[?]…are well and in Spirits, Sergt Daniel White is very hearty for him, M. Samuel C[?] is well and in good health Benjm Thompson is well Charles Bryant is well [?] is well Eben[?] Smith is very much plagued with the Rheumatik Disease[?] he……… his limbs very often for being Crippled[?] he is at the Hospital I often visit it to see the sick Jacob Barnes is at the Hospital but recovering fast been very sick. Luther Gregory is at the Hospital and on the recovery, Sergt. L[?] & Smith are well, Henry ………[?] is well, very healthy have not more die here than 3…[?]to the best of my knowledge. I will make a few remarks upon the place it abounds in Lime Rock more than Thomaston and not every person to my knowledge burn it, and in the whole Town not but one Pump that supplies the Towns People and Soldiers and a ………[?] of such a Lake of water the Lake water is good for drinking but the water near the Shore is exposed to all kind of filth being thrown into it. The officers with whom I have been with have used me kindly and I get quietly by them. The Lieut. Downer who recruits at Thomaston tell me he has thots[?] of Leaving the army if so I must say I am greatly sorry as he was my ……[?] friend although he Left us and went in a northern Company it is a Company……………[?]worthy an officer as he proves to be, I cannot get any higher than a Sergeant or Quarter Master Sergeant which I may have without any friends at Thomaston assisting me. I am a Sergeant and Sergeant Daniel White is expecting[?] to be a Quarter Master Sergeant, and a number of his friends from Thomaston have went to their Major for him in the 9th Regt Major….[?] and he expects to obtain a Commission as I ……[?] expect to be promoted and it died away he will have the Laugh upon me, I wish that My Friend Dawes would[?] put the question to Col. Foot? to write to our Col. E.W. Ripley if he has …[?]in the …[?]taken by him and others of my …[?] friends[?]. I expect to come home this winter without fail. I remain your Loving Husband till Death. John Bentley for Betsey Bentley Thomaston P.S. The next Letter will be ……[?]to Mr. Dawes[?] and shall write as soon as our Fleet arrives or if we are ordered off tomorrow shall write before I leave this Place. I have understood that many letters have been ……[?]to me. I have received only 2 from Mary, one from Mr. Dawes, one from William Thompson and have answered them please to write……[?]to S. Harbour.
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A photograph of the construction at Baie Comeau, with the caption "'Sinking' dynamite for blast in rock immediately behind temporary staff house."
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An article in the Toronto Star written by Dorothy Rungeling during the 'Powder Puff' Derby. She is reporting from the Wichita, Kansas leg of the race and remarks about her time in California.
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An article about Dorothy Rungeling in her third Derby competition in 1958. She will be co-piloted by Miss Susan Koch and the route will take them from San Diego, California to Charleston, South Carolina.
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A photograph of a large group/family photo on the rock steps of an outdoors location. There are nine individuals and one dog in the photograph.