1,218 research outputs found
Catlin Arctic Survey 2010 Environmental data
No full textThe citation text is:
Findlay H.S. (2015). Catlin Arctic Survey 2010 Environmental data. British Oceanographic Data Centre - Natural Environment Research Council, UK. doi:10/767
Modelling of autumn plankton bloom dynamics
No full textA simple system of parametrically forced ordinary differential equations is used to model autumn phytoplankton blooms in temperate oceans by a mechanism involving deepening of the upper mixed layer. Blooms are triggered provided the increase in nutrients in the mixed layer is rapid within the first few days of deepening and provided light-limited phytoplankton growth rate is relatively high. Blooms exist as transient trajectories between quasi-equilibrium states, rather than as bifurcations of steady states; therefore very gradual deepening cannot trigger blooms. Very rapid deepening also prevents blooms due to the deleterious effect on phytoplankton growth rate. The mechanisms identified by this simple model are vindicated by considering alternative grazing and deepening regimes and by comparison with a more ecologically complex model (Fasham, 1993, in The Global Carbon Cycle, Springer-Verlag). Modelled estimates of primary productivity from both the simple model and the complex model parameterized for Ocean Weather Station ‘India’ are around 0.5 g C m–2 day–1 during the autumn bloom, therefore comprising a significant component of annual production in temperate areas
Four Months Under Arms
No full textA book written by H.S. Nelson about his experiences fighting in the second Riel Rebellion
Words standarization by non-parametric statistical methods
No full textThe author has dealt with amalgamation of pattern primitives and its justification in language description, in earlier studies [4] & [5]. Here an attempt is being made to apply distribution free techniques, more commonly known as non-parametric statistical methods in finding the confidence coefficient and adjustment factor for obtaining the standard form of words taken from different sub-dialects.Dhami, H.S.. (2001). Words standarization by non-parametric statistical methods. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3587
Short-term metabolic and growth responses of the cold-water coral Lophelia pertusa to ocean acidification
No full textCold-water corals are associated with high local biodiversity, but despite their importance as ecosystem engineers, little is known about how these organisms will respond to projected ocean acidification. Since preindustrial times, average ocean pH has decreased from 8.2 to ~8.1, and predicted CO2 emissions will decrease by up to another 0.3 pH units by the end of the century. This decrease in pH may have a wide range of impacts upon marine life, and in particular upon calcifiers such as cold-water corals. Lophelia pertusa is the most widespread cold-water coral (CWC) species, frequently found in the North Atlantic. Here, we present the first short-term (21 days) data on the effects of increased CO2 (750 ppm) upon the metabolism of freshly collected L. pertusa from Mingulay Reef Complex, Scotland, for comparison with net calcification. Over 21 days, corals exposed to increased CO2 conditions had significantly lower respiration rates (11.4±1.39 SE, µmol O2 g?1 tissue dry weight h?1) than corals in control conditions (28.6±7.30 SE µmol O2 g?1 tissue dry weight h?1). There was no corresponding change in calcification rates between treatments, measured using the alkalinity anomaly technique and 14C uptake. The decrease in respiration rate and maintenance of calcification rate indicates an energetic imbalance, likely facilitated by utilisation of lipid reserves. These data from freshly collected L. pertusa from the Mingulay Reef Complex will help define the impact of ocean acidification upon the growth, physiology and structural integrity of this key reef framework forming species
[Letter] 1864 January 4, Cambridge [to] H.S. Roanoke / John G. Palfrey.
No full textPalfrey states that upon returning from a journey he received the four volume _Documentary History of New York_ which he lauds as a "highly valuable contribution to our historical literature." The author of _History of New England_ (1858) and _Papers on the slave power: first published in the "Boston Whig," in July, August, and September, 1846_ , Palfrey\u27s diverse occupations included serving as a Unitarian minister, historian, legislator, and Boston postmaster; he also contributed articles to the _North American Review_ which he later purchased and edited until 1843
Metafore spaziali della conoscenza di sé nei dialoghi di H.S. Skovoroda : fonti patristiche
No full textSpatial Metaphors for Self-knowledge in the dialogues of H.S Skovoroda. Patristic Sources
In this paper the Author analyzes some spatial metaphors informing H.S. Skovoroda’s representation of self-knowledge as a dynamic process. Knowledge of the true self – which is one of the recurring themes in the Ukrainian philosopher’s oeuvre – is often portrayed as tension between open (e.g. streets, markets, the sky, the planets…) and closed spaces (e.g. the house, the room), with the ‘home’ being a symbol for the soul. As man seeking communion with God has to abandon what lies outside his inner self, the authentic gnoseological process is represented as an introverted movement through symbolic space. Broadly speaking, this very opposition harks back to Philo of Alexandria and Patristic thought, whose anti-physicist stance shaped their rejection of the phenomenological world as an ‘interior vs. exterior’ contrast. Furthermore, the broader biblical context in which those spatial terms appear is also taken into account, while demonstrating Skovoroda’s partial dependence on Patristic models. The fi nal part of the paper argues that the scheme underlying Neo-platonic emanation – which is itself to be considered as an oscillation between unity and dispersion – appears to be a symbolic model for Skovoroda’s spatial representation of self-knowledge
Constitutive modeling of deformation behavior of high-entropy alloys with face-centered cubic crystal structure
No full textA constitutive model based on the dislocation glide and deformation twinning is adapted to face-centered cubic high-entropy alloys (HEAs) as exemplified by the CrMnFeCoNi system. In this model, the total dislocation density is considered as the only internal variable, while the evolution equation describing its variation during plastic deformation is governed by the volume fraction of twinned material. The suitability of the model for describing the strain hardening behavior of HEAs was verified experimentally through compression tests on alloy CrMnFeCoNi and its microstructure characterization by electron backscatter diffraction and X-ray diffraction using synchrotron radiation. ? 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.1111Ysciescopu
Superior pre-osteoblast cell response of etched ultrafine-grained titanium with a controlled crystallographic orientation
No full textUltrafine-grained (UFG) Ti for improved mechanical performance as well as its surface modification enhancing biofunctions has attracted much attention in medical industries. Most of the studies on the surface etching of metallic biomaterials have focused on surface topography and wettability but not crystallographic orientation, i.e., texture, which influences the chemical as well as the physical properties. In this paper, the influences of texture and grain size on roughness, wettability, and pre-osteoblast cell response were investigated in vitro after HF etching treatment. The surface characteristics and cell behaviors of ultrafine, fine, and coarse-grained Ti were examined after the HF etching. The surface roughness during the etching treatment was significantly increased as the orientation angle from the basal pole was increased. The cell adhesion tendency of the rough surface was promoted. The UFG Ti substrate exhibited a higher texture energy state, rougher surface, enhanced hydrophilic wettability, and better cell adhesion and proliferation behaviors after etching than those of the coarse- and fine-grained Ti substrates. These results provide a new route for enhancing both mechanical and biological performances using etching after grain refinement of Ti. ? The Author(s) 2017.115Ysciescopu
Carbon and nutrient mixed layer dynamics in the Norwegian Sea
No full textA coupled carbon-ecosystem model is compared to recent data from Ocean Weather Station M (66 N, 02 E) and used as a tool to investigate nutrient and carbon processes within the Norwegian Sea. Nitrate is consumed by phytoplankton in the surface layers over the summer; however the data show that silicate does not become rapidly limiting for diatoms, in contrast to the model prediction and in contrast to data from other temperate locations. The model estimates atmosphere-ocean CO2 flux to be 37 g C m-2 yr-1. The seasonal cycle of the carbonate system at OWS M resembles the cycles suggested by data from other high-latitude ocean locations. The seasonal cycles of calcite saturation state and [CO2-3 ] are similar in the model and in data at OWS M: values range from ~3 and ~120µmol kg-1 respectively in winter, to ~4 and ~170µmol kg-1 respectively in summer. The model and data provide further evidence (supporting previous modelling work) that the summer is a time of high saturation state within the annual cycle at high-latitude locations. This is also the time of year that coccolithophore blooms occur at high latitudes
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