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Articles de revues sur le sujet "Remnants used in"
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W. Arnold, G., et J. R. Weeldenburg. « The effects of isolation, habitat fragmentation and degradation by livestock grazing on the use by birds of patches of Gimlet Eucalyptus salubris woodland in the wheatbelt of Western Australia ». Pacific Conservation Biology 4, no 2 (1998) : 155. http://dx.doi.org/10.1071/pc980155.
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The numbers of species, and the frequency of occurrence of individual species, in patches of Gimlet Eucalyptus salubris woodland in remnants of native vegetation in the central wheatbelt of Western Australia were recorded over a year. These values were examined in relation to the structural characteristics of the patches and the biogeographic attributes of the remnants (i.e., size and various indices of isolation from other native vegetation). There were five patches in large remnants (>100 ha) and 24 patches in small remnants (0.5?27.0 ha). Most of the small remnants were grazed by livestock and had lost much or all of the shrub understorey. The Galah Cacatua roseicapilla and Port Lincoln Ringnecked Parrot Platycercus zonarius were found in all patches, but the remaining large species of birds (Australian Raven Corvus coronoides,Pied Butcherbird Cracticus nigroregularis, Crested Pigeon Ocyphaps lophotes, and Yellow-throated Miner Manorina flavigula) were found more frequently in patches in small remnants. Conversely, with the exception of the Striated Pardalote Pardalotus striatus, small passerine species were found less frequently in patches in small remnants. Remnant size was significantly negatively correlated with frequency of occurrence of six of the eight common large species, indicating that these species concentrated in patches in small remnants, and significantly positively correlated with frequency of occurrence of two of four small passerine species. Having taken out the effect of remnant area, a stepwise regression procedure was used to see whether other biogeographic attributes of the remnants or habitat structure in the patches influenced the frequency of occurrence of individual species and species richness. As area of native vegetation within a 5 km radius increased so did the frequency of occurrence of the Galah and Port Lincoln Parrot, indicating that local numbers of the species affects their presence. Of the large birds only the Yellowthroated Miner was influenced by patch structural attributes whereas all species of small passerines showed responses to various structural attributes of the patches. Frequency of occurrence of the Striated Pardalote and the number of species of small passerines in a patch decreased with increasing distance to the nearest native vegatation. Overall frequency of occurence of small passerines increased with the number of linear strips of native vegetation linked to a remnant. In this study a majority of the small remnants were too small to support resident birds. The Gimlet patches, if used, would be part of a home range. Loss of the shrub understorey through grazing and loss of canopy cover through tree deaths had a significant impact on numbers of species of small passerines using the Gimlet patches. The conservation value of the patches in small remnants would be enhanced by increasing remnant size and by the linking of remnants to nearby native vegetation.
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Angelo, M. S., J. F. C. Santos, W. J. B. Corradi et F. F. S. Maia. « Investigating dynamical properties of evolved Galactic open clusters ». Astronomy & ; Astrophysics 624 (avril 2019) : A8. http://dx.doi.org/10.1051/0004-6361/201832702.
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Context. The stellar content of Galactic open clusters is gradually depleted during their evolution as a result of internal relaxation and external interactions. The final residues of the long-term evolution of open clusters are called open cluster remnants. These are sparsely populated structures that can barely be distinguished from the field. Aims. We aimed to characterise and compare the dynamical states of a set of 16 objects catalogued as remnants or remnant candidates. We employed parameters that are intimately associated with the dynamical evolution: age, limiting radius, stellar mass, and velocity dispersion. The sample also includes 7 objects that are catalogued as dynamically evolved open clusters for comparison purposes. Methods. We used photometric data from the 2MASS catalogue, proper motions and parallaxes from the Gaia DR2 catalogue, and a decontamination algorithm that was applied to the three-dimensional astrometric space of proper motions and parallaxes (μα, μδ, ϖ) for stars in the objects’ areas. The luminosity and mass functions and total masses for most open cluster remnants are derived here for the first time. Our analysis used predictions of N-body simulations to estimate the initial number of stars of the remnants from their dissolution timescales. Results. The investigated open cluster remnants present masses (M) and velocity dispersions (σv) within well-defined ranges: M between ∼10−40 M⊙ and σv between ∼1−7 km s−1. Some objects in the remnant sample have a limiting radius Rlim ≲ 2 pc, which means that they are more compact than the investigated open clusters; other remnants have Rlim between ∼2−7 pc, which is comparable to the open clusters. We suggest that cluster NGC 2180 (previously classified as an open cluster) is entering a remnant evolutionary stage. In general, our clusters show signals of depletion of low-mass stars. This confirms their dynamically evolved states. Conclusions. We conclude that the open cluster remnants we studied are in fact remnants of initially very populous open clusters (N0 ∼ 103−104 stars). The outcome of the long-term evolution is to bring the final residues of the open clusters to dynamical states that are similar to each other, thus masking out the memory of the initial formation conditions of star clusters.
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Petre, R. « X-Ray Spectroscopy of Supernova Remnants ». International Astronomical Union Colloquium 145 (1996) : 357–68. http://dx.doi.org/10.1017/s0252921100008216.
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X-ray spectroscopy can provide vital information about the progenitors and environments of supernova remnants. Plasma diagnostics and spectral modelling can be used to infer the energy of the remnant, the density and composition of the surrounding medium, and the degree of equilibrium in the shock heated gas. A new generation of X-ray spectrometers, the first of which was the Broad-Band X-Ray Telescope (BBXRT), has improved our ability to make precise measurements of X-ray line fluxes and energies. We summarize the results obtained from the BBXRT mission. These include a definitive measurement of the Fe K line centroid in the Tycho remnant, production of the first narrow-band X-ray maps (of Puppis A) and the first measurement of an electron-ion equipartition timescales in evolved remnants.
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Siegel, Jared, Vikram V. Dwarkadas, Kari A. Frank et David N. Burrows. « Can the Fe K-alpha Line Reliably Predict Supernova Remnant Progenitors ? » Astrophysical Journal 922, no 1 (1 novembre 2021) : 67. http://dx.doi.org/10.3847/1538-4357/ac2305.
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Abstract The centroid energy of the Fe Kα line has been used to identify the progenitors of supernova remnants (SNRs). These investigations generally considered the energy of the centroid derived from the spectrum of the entire remnant. Here we use XMM-Newton data to investigate the Fe Kα centroid in 6 SNRs: 3C 397, N132D, W49B, DEM L71, 1E 0102.2-7219, and Kes 73. In Kes 73 and 1E 0102.2-7219, we fail to detect any Fe Kα emission. We report a tentative first detection of Fe Kα emission in SNR DEM L71 with a centroid energy consistent with its Type Ia designation. In the remaining remnants, the spatial and spectral sensitivity is sufficient to investigate spatial variations of the Fe Kα centroid. We find in N132D and W49B that the centroids in different regions are consistent with those derived from the overall spectrum, although not necessarily with the remnant type identified via other means. However, in SNR 3C 397, we find statistically significant variation in the centroid of up to 100 eV, aligning with the variation in the density structure around the remnant. These variations span the intermediate space between centroid energies signifying core-collapse (CC) and Type Ia remnants. Shifting the dividing line downwards by 50 eV can place all the centroids in the CC region, but contradicts the remnant type obtained via other means. Our results show that caution must be used when employing the Fe Kα centroid of the entire remnant as the sole diagnostic for typing a remnant.
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Berkmann, Sven, Sven Schlaffer et Michael Buchfelder. « Tumor shrinkage after transsphenoidal surgery for nonfunctioning pituitary adenoma ». Journal of Neurosurgery 119, no 6 (décembre 2013) : 1447–52. http://dx.doi.org/10.3171/2013.8.jns13790.
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Object Volume reduction of nonfunctioning pituitary adenomas has been described, for example, after radiotherapy and pituitary tumor apoplexy. Even when considerable remnants remain after surgery, spontaneous shrinkage and relief of mass lesion symptoms can sometimes occur. The aim of this study was to assess shrinkage of tumor residues after transsphenoidal surgery and to identify predictors of tumor shrinkage. Methods A total of 140 patients with postoperative remnants of nonfunctioning pituitary adenomas treated at the Department of Neurosurgery, University Hospital Erlangen, Erlangen, Germany, were included in this study. All patients underwent transsphenoidal procedures with guidance by 1.5-T intraoperative MRI. The intraoperative images of remnants were compared with images taken at 3 months and at 1 year after surgery. The possible predictors analyzed were age; sex; preoperative and intraoperative tumor dimensions; tumor growth pattern; endocrinological, ophthalmological, and histological characteristics; and history of previous pituitary surgery. For statistical analyses, the Fisher's exact test, Mann-Whitney U-test, and multivariate regression table analysis were used. Results Follow-up imaging 3 months after surgery showed tumor remnant shrinkage of 0.5 ± 0.6 cm3 for 70 (50%) patients. This reduction was 89% ± 20% of the residual volume depicted by intraoperative MRI. In 45 (64%) patients, the remnants disappeared completely. Age, sex, and preoperative tumor volume did not significantly differ between the shrinkage and no-shrinkage groups. Positive predictors for postoperative shrinkage were cystic tumor growth (p = 0.02), additional resection of tumor remnants guided by intraoperative MRI (p = 0.04), smaller tumor volume (p = 0.04), and smaller craniocaudal tumor diameter of remnants (p = 0.0014). Negative predictors were growth into the cavernous sinus (p = 0.009), history of previous pituitary surgery (p = 0.0006) and tumor recurrence (p = 0.04), and preoperative panhypopituitarism (p = 0.04). Multivariate regression analysis indicated a positive correlation between tumor shrinkage and smaller tumor remnants (p < 0.0001) and no history of previous pituitary surgery (p = 0.003). No spontaneous change in tumor remnant volume was detected between 3 months and 1 year postoperatively. During a mean follow-up time of 2.7 years, 1 (2%) patient with postoperative tumor shrinkage had to undergo another operation because of tumor progression. Conclusions Spontaneous volume reduction of nonfunctioning pituitary adenoma remnants can occur within 3 months after surgery. Predictors of shrinkage are smaller tumor remnant volume and no history of previous pituitary surgery.
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Spinelli, Andrea, Fausto Zamparini, Alessio Buonavoglia, Paolo Pisi, Maria Giovanna Gandolfi et Carlo Prati. « Reciprocating System for Secondary Root Canal Treatment of Oval Canals : CBCT, X-rays for Remnant Detection and Their Identification with ESEM and EDX ». Applied Sciences 12, no 22 (17 novembre 2022) : 11671. http://dx.doi.org/10.3390/app122211671.
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Aim of the study: to evaluate root filling remnants after secondary root canal treatments (SRCTs) of oval-shaped canals with X-rays and cone beam computed tomography (CBCT). The SRCTs were performed using reciprocating NiTi instruments. Methods: Single-rooted teeth (N = 64) were randomly treated with Reciproc Blue (RB) and filled with AH Plus/single cone (SC group) or AH Plus/Guttafusion (GF group). After seven days of storage in HBSS (Hanks balanced salt solution), Gates Glidden burs #2/3 and RB #25 and #40 were used for the SRCTs. The time to complete the procedure was measured. X-rays and CBCT were used to calculate, respectively, the area and the volume occupied by the remnants in the coronal, middle, and apical thirds of each canal. Environmental scanning electron microscopy (ESEM) and energy dispersive X-ray spectroscopy (EDX) were used for qualitative evaluation and morphology composition of the remnants in sectioned roots. A statistical analysis was performed using Sigma Plot (version 13, IBM, Armonk, NY, USA). The study was designed according to PRILE guidelines. Results: After the SRCTs, the middle thirds of the root canals showed the presence of remnants in both groups, as demonstrated by X-rays and CBCT. The GF group showed a statistically significant higher volume of remnants than the SC Group only in the middle third. The ESEM supported by the EDX revealed the remnant composition by the detection of trace elements of sealer and gutta-percha in all root canals. Conclusion: The study demonstrated that the middle third of root canals is a critical region where remnants were packed and spread in the buccal-lingual sides of canals. ESEM-EDX detected a fine layer of filling remnants in all root thirds, suggesting a larger canal contamination than the X-rays and CBCT examinations revealed.
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Rocha, CFD, HG Bergallo, M. Van Sluys, MAS Alves et CE Jamel. « The remnants of restinga habitats in the brazilian Atlantic Forest of Rio de Janeiro state, Brazil : habitat loss and risk of disappearance ». Brazilian Journal of Biology 67, no 2 (mai 2007) : 263–73. http://dx.doi.org/10.1590/s1519-69842007000200011.
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"Restingas" (herbaceous/shrubby coastal sand-dune habitats) used to cover most of Rio de Janeiro State coast, and have suffered extensive degradation over the last five centuries. Using satellite images and field work, we identified the remaining restingas in the State, recording the factors that might cause their degradation. We used two mosaics of Landsat 7 scenes (spatial resolution 15 and 30 m) to map and evaluate preliminarly the remaining areas and conservation status. Each remnant area was checked in the field, degraded areas within it were mapped and subtracted from the remnants. We identified 21 restinga remnants totalling 105,285 ha. The largest and smallest restinga remnants were Jurubatiba (25,141 ha) and Itaipu (23 ha), respectively. We identified 14 causes of degradation. The most important were vegetation removal for housing developments, establishment of exotic plant species, change of original substrate, and selective removal of species of economic importance for the horticultural industry. All restingas had disturbed parts under strong pressure due to human activities. Due to intense habitat loss, and occurrence of endemic/threatened vertebrate species in restinga habitats, we strongly indicate the implementation of new conservation units to protect these fragile remnants. This habitat is steadily decreasing and most remnants lack legal protection. Therefore, under the current human pressure most of this unique habitat is likely to be lost from the State within the next few years.
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Sultan, F., D. Lagrange, X. Le Liepvre et S. Griglio. « Chylomicron-remnant uptake by freshly isolated hepatocytes. Effect of heparin and of hepatic triacylglycerol lipase ». Biochemical Journal 258, no 2 (1 mars 1989) : 587–94. http://dx.doi.org/10.1042/bj2580587.
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Chylomicron remnants labelled biologically with [3H]cholesterol were efficiently taken up by freshly isolated hepatocytes during a 3 h incubation in Krebs bicarbonate medium. Their [3H]cholesteryl ester was hydrolysed (74% net hydrolysis), and 0.1 mM-chloroquine could partially inhibit this hydrolysis, provided that hepatocytes were first preincubated for 2 h 30 min at 37 degrees C. This hydrolysis was also measured in preincubated cells with remnants double-labelled (3H and 14C) on their free cholesterol moiety; [3H]cholesterol arising from [3H]cholesteryl ester hydrolysis was recovered in the free [3H]cholesterol pool. A dose-response study showed saturation of remnant uptake at 180 micrograms of remnant protein/10(7) cells. Heparin (10 units/ml) increased remnant uptake by 63% (P less than 0.01), [3H]cholesteryl ester accumulation in the cell pellet by 110% (P less than 0.025) and hepatic lipase activity secreted in the medium by 2.4-fold (P less than 0.01) and by 3.3-fold (P less than 0.01) at the end of the preincubation and incubation periods respectively. Addition of 100 munits of semi-purified hepatic lipase preparation/flask stimulated remnant uptake by 44-69%, and [3H]cholesteryl ester accumulation in the presence of chloroquine by 2.1-fold (P less than 0.025). When hepatic lipase was incubated solely with the remnants, it decreased their triacylglycerol and phospholipid contents by 24% and 26% respectively. Thus freshly isolated hepatocytes may be used to study chylomicron-remnant uptake. Hepatic lipase, which seems to underly the stimulating effect of heparin, facilitates remnant uptake in vitro, and this could be mediated by at least one (or both) of its hydrolytic properties.
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Michael, Konstantinos, Anastasia Hadjiconstanti, Antonis Lontos, George Demosthenous, Savvas Frangos et Yiannis Parpottas. « A Neck-Thyroid Phantom with Small Sizes of Thyroid Remnants for Postsurgical I-123 and I-131 SPECT/CT Imaging ». Life 13, no 4 (6 avril 2023) : 961. http://dx.doi.org/10.3390/life13040961.
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Post-surgical I-123 and I-131 SPECT/CT imaging can provide information on the presence and sizes of thyroid remnants and/or metastasis for an accurate re-staging of disease to apply an individualized radioiodine therapy. The purpose of this study was to develop and validate a neck–thyroid phantom with small sizes of thyroid remnants to be utilized for the optimization of post-surgical SPECT/CT imaging. 3D printing and molding techniques were used to develop the hollow human-shaped and -sized phantom which enclosed the trachea, esophagus, cervical spine, clavicle, and multiple detachable sections with different sizes of thyroid remnant in clinically relevant positions. CT images were acquired to evaluate the morphology of the phantom and the sizes of remnants. Triple-energy window scattered and attenuation corrected SPECT images were acquired for this phantom and for a modified RS-542 commercial solid neck–thyroid phantom. The response and sensitivity of the SPECT modality for different administered I-123 and I-131 activities within the equal-size remnants of both phantoms were calculated. When we compared the phantoms, using the same radiopharmaceutical and similar activities, we found that the measured sensitivities were comparable. In all cases, the I-123 counting rate was higher than the I-131 one. This phantom with capabilities to insert different small sizes of remnants and simulate different background-to-remnants activity ratios can be utilized to evaluate postsurgical thyroid SPECT/CT imaging procedures.
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J. Grey, Merilyn, Michael F. Clarke et Richard H. Loyn. « Influence of the Noisy Miner Manorina melanocephala on avian diversity and abundance in remnant Grey Box woodland ». Pacific Conservation Biology 4, no 1 (1998) : 55. http://dx.doi.org/10.1071/pc980055.
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The abundance of an aggressive Australian honeyeater, the Noisy Miner Manorina melanocephala, was reduced at four small (<8 ha) Grey Box Eucalyptus microcarpa woodland remnants by experimental removal. The diversity and abundance of small insectivorous and nectarivorous birds increased at three of the four sites (relative to matching control sites) over the twelve months following the removal of the Noisy Miners. The one exception occurred at a pair of sites where eucalypts began flowering at one site and finished at the other during the Noisy Miner removal period. These results, taken together with those from three earlier experiments where the abundance of Noisy Miners was reduced in Mugga Ironbark E. Sideroxylon woodland remnants, demonstrate that Noisy Miners affect avian diversity and abundance by aggressive exclusion of other species. In five out of seven experiments, Noisy Miners did not reinvade the small woodland remnants during the ensuing twelve months. When Noisy Miner abundance was reduced, increased populations of small insectivorous and nectarivorous birds used small degraded woodland remnants. Colonizing populations of small birds have the potential to reduce insect infestations and may assist in the recovery of dieback-affected woodland remnants. Research is continuing to test this hypothesis. Reducing the abundance of Noisy Miners in remnant eucalypt woodlands may also be a useful, short-term measure, which could assist in the recovery of threatened or endangered bird species.
Thèses sur le sujet "Remnants used in"
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Jones, Angel D. Mrs. « Remnants ». VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/4006.
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Angel Jones
Artist Statement
My mixed media collages address issues concerning the outcast, the overlooked, and the underprivileged. My inspirations come from what I experience and perceive around me. My purpose in life is to use my art to address social issues that involve children. For example, I focus my attention on issues ranging from homelessness to mental illness. I am passionate about how vital these concerns are to our success as human beings.
To express my ideas, I layer a variety of materials and textiles. The materials include fragments of photographs, drawings, and objects. The textiles include articles of clothing and fabrics. Recurring symbols and imagery link the individual pieces together. The theme of each work determines the materials and media. While doing research for a piece, new social issues often surface and lead to the next piece.
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Deakin, Elizabeth Louise. « Impacts of land-use intensification on forest remnants embedded within production landscapes ». Thesis, University of Canterbury. Biological Sciences, 2013. http://hdl.handle.net/10092/8712.
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Agricultural expansion has transformed and fragmented natural forest habitats at an alarming rate, and dramatic increases in agricultural intensification have since taken place in order to keep pace with human population growth and food demands. This simultaneously poses a considerable threat to biodiversity in agricultural landscapes, as production land is now one of the largest terrestrial biomes on the planet. Therefore, its contribution to biodiversity conservation is critical.
Links between the intensification of agricultural systems and ‘in situ’ declines of biodiversity on farmland have been well documented. However, despite growing recognition that system inputs such as fertiliser and livestock can move or ‘spillover’ into adjacent natural habitats, there has been no direct quantification of the extent of impacts in recipient ecosystems. These abiotic and biotic pathways can cause dramatic impacts on the diversity, composition, and functioning of remaining natural ecosystems, and on their ability to provide a variety of essential ecosystem services. Due to concerns regarding future food security, balancing trade-offs between agriculture and conservation has subsequently become a hot topic in ecological research. However, without any direct quantification of the off-site ecological impacts of agricultural intensification in mosaic landscapes, it is inherently difficult to fully evaluate strategies aimed at balancing production and conservation.
Using New Zealand farming systems as a case study, this thesis aims to address gaps in our current understanding of how increasing agricultural intensification impacts biodiversity in native forest remnants embedded within production landscapes. The first main chapter explores whether the magnitude of ecological impact in forest remnants (for a suite of 26 response measures) and severity of edge effects, scale with the degree of land-use intensity in surrounding agricultural pastures. This chapter also examines whether ecological responses differ in remnants ‘spared’ for conservation purposes (i.e. where livestock are excluded by fencing). The second chapter uses a model food-chain approach native to New Zealand, to test whether nutrient spillover from agricultural pastures influences plant-herbivore and herbivore-parasitoid interactions in forest remnants. This chapter also includes a large-scale common garden fertilisation experiment using the same tri-trophic system, which was established to examine bottom-up multi-trophic responses to the independent and combined effects of Nitrogen (N), Phosphorus (P) and cow dung and urine. The third main chapter uses a novel stable isotope approach for quantifying community-wide incorporation of resources into trophic structure. I test for the first time whether increasing intensity of farming systems drives greater nutrient spillover spatially into adjacent forest remnant soils and examine scaling effects of 15N (as a marker for anthropogenic N) through multiple trophic levels.
Beyond finding that agricultural land-use intensity generally has negative off-site effects on biodiversity, the key findings of this thesis were (i) spillover of nitrogen and phosphorus from agricultural systems into adjacent remnant soils is exacerbated by increases in land-use intensity, with (ii) percolating bottom-up effects on plant and insect community dynamics. (iii) The magnitude of ecological impacts in forest remnants scales linearly with increasing land-use intensity, as does (iv) direct anthropogenic N enrichment across multiple trophic levels, which has the potential to severely jeopardise the stability of ecologically important remnant habitats. (v) Although there were stark structural differences in remnants with and without livestock exclusion, impacts of land-use intensity on ecological response metrics were actually comparable across all sites. (vi) Livestock exclusion should be a priority first step towards conserving native forest remnants, however it should be recognised that fencing does not prevent abiotic channels of nutrient spillover (fertiliser drift, overland flow, leaching) in land characteristic of land spared for nature. (vii) Consequently, increasing land-use intensity compromises the effectiveness of the land-sparing trajectory for conserving native biodiversity, which is currently undertaken in New Zealand production systems.
Given the overall strength of these findings and the novel, ecosystem-wide and landscape-scale approaches taken to address fundamental questions, the work in this thesis greatly enhances our knowledge of the relationships between agricultural productivity and ecological impacts in spatially-coupled ecosystems. This is highly important, not only in New Zealand but worldwide, as it is anticipated that unstoppable human population growth and food security pressures will cause ecological impacts both on the farm and in adjacent natural ecosystems to become even more severe. Therefore, determining the relationship between land-use intensification and biodiversity loss represents the cornerstone of sustainable agricultural development in the future.
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O'Brien, Michael Thomas. « Natural remnants in urban environments : a Marott Park design intervention ». Virtual Press, 2002. http://liblink.bsu.edu/uhtbin/catkey/1230605.
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The processes by which urban areas come to be and evolve create outdoor spaces that experience different uses and have different characteristics over a period of time. For example, a space previously used for industrial purposes may presently be used as a community park. In some cases, a significant area of land may become a kind of leftover or remnant space whose uses are unclear, undefined, or unprogrammed, but exhibits natural characteristics. The purpose of this study is to utilize one of these natural remnants, Marott Park, in the cultural arts district of Broad Ripple in Indianapolis, Indiana as the basis for a design effort that provides access to the site while retaining both its site-specific and contextual characteristics. The intent of this effort is to enhance the community/pedestrian recreational, educational, and cultural experience through a detailed design for a portion of Marott Park. A set of recommendations also addresses the potential for connections between the site and other features such as existing open space, schools, and cultural features in the Indianapolis area.Department of Landscape Architecture
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Stevens, Randall Elliott. « The use of weed technology in Palouse prairie remnants for management and restoration ». Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Thesis/Summer2010/r_stevens_051010.pdf.
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Thesis (M.S. in crop science)--Washington State University, August 2010.Title from PDF title page (viewed on July 30, 2010). "Department of Crop and Soil Sciences." Includes bibliographical references.
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Ben, Kahn Ali. « Management planning for small multiple-use remnants of native vegetation : a case study of Douglas Scrub / ». Title page, table of contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09ENV/09envk12.pdf.
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Johansson, Veronika A., Sara A. O. Cousins et Ove Eriksson. « Remnant Populations and Plant Functional Traits in Abandoned Semi-Natural Grasslands ». Stockholms universitet, Botaniska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-67847.
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Although semi-natural grasslands in Europe are declining there is often a time delay in the local extinction of grassland species due to development of remnant populations, i.e., populations with an extended persistence despite a negative growth rate. The objectives of this study were to examine the occurrence of remnant populations after abandonment of semi-natural grasslands and to examine functional traits of plants associated with the development of remnant populations. We surveyed six managed semi-natural grasslands and 20 former semi-natural grasslands where management ceased 60-100 years ago, and assessed species response to abandonment, assuming a space-for-time substitution. The response of species was related to nine traits representing life cycle, clonality, leaf traits, seed dispersal and seed mass. Of the 67 species for which data allowed analysis, 44 species declined after grassland abandonment but still occurred at the sites, probably as remnant populations. Five traits were associated with the response to abandonment. The declining but still occurring species were characterized by high plant height, a perennial life form, possession of a perennial bud bank, high clonal ability, and lack of dispersal attributes promoting long-distance dispersal. Traits allowing plants to maintain populations by utilizing only a part of their life cycle, such as clonal propagation, are most important for the capacity to develop remnant populations and delay local extinction. A considerable fraction of the species inhabiting semi-natural grasslands maintain what is most likely remnant populations after more than 60 years of spontaneous succession from managed semi-natural grasslands to forest.authorCount :3
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Barahona, Túpac A. « The impact of human practices on forest remnants people and conservation in a small nature reserve in western Nicaragua ». Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou987449787.
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Lindgren, Jessica. « Small remnant habitats : Important structures in fragmented landscapes ». Doctoral thesis, Stockholms universitet, Institutionen för naturgeografi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-148653.
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The world-wide intensification of agriculture has led to a decline in species richness due to land use change, isolation, and fragmentation of natural and semi-natural habitats in agricultural and forestry landscapes. As a consequence, there is a current landscape management focus on the importance of green infrastructure to mitigate biodiversity decline and preserve ecosystem functions e.g. pollination services and pest control. Even though intensification in agriculture has been ongoing for several hundreds of years, remnant habitats from earlier management practices may still be remaining with a surprisingly high plant richness. Preserving these habitats could help conserving plant species richness in agricultural landscapes, as well as other organisms that are dependent on plants for food and shelter. In this thesis I focus on two small remnant habitats; midfield islets and borders between managed forest and crop field in southeastern Sweden. In the past, both habitats were included in the grazing system and therefore often still have remnant population of grassland specialist species left today. I have used these two remnant habitats as model habitats to investigate the effect of landscape factors and local factors on species richness of plants, flower morphologies and plants with fleshy fruits. Additively, I analysed the effect of surrounding landscape and local openness on the functions; pollination success, biological pest control of aphids and seed predation on midfield islets. One of my studies showed that spatial distribution and size of the habitat affected plant species richness. Larger habitat size and higher connectivity between habitats increased species richness of plants in the habitats. Openness of the habitats was shown to be an important factor to increase species richness and richness of flower morphologies, both on midfield islets and in forest borders. Even though midfield islets had the highest species and morphology richness, both habitat types are needed for habitat complementary as forest borders have more plants with fleshy fruits and a higher richness of plant species that flowers in spring/early summer. It was also shown that a more complex forest border, not just with gaps in the canopy, but also with high variation in tree stem sizes increases plant species richness in the field layer. The conclusion is that by managing small remnant habitats to remain or become more semi-open and complex in their structure, would increase species richness of plants, grassland specialist species, and flower morphologies. It would also increase some ecosystem functions as seed predation and biologic pest control of aphids are more effective close to trees. If both midfield islets and forest borders would be managed to be semi-open, the area and connectivity of semi-open habitat would increase in the agricultural landscape, which may also improve pollination success as the connectivity between populations has a possibility to increase. Grassland specialist species are clearly abundant in the small remnant habitats. As the decline of semi-natural grasslands is causing a decline in grassland specialists’ species, not only plants, I recommend that small remnant habitats are included in conservation and management plans and strategies to improve habitat availability and connectivity for grassland species in agricultural landscapes.Research funder Ekoklim. Project:4339602.
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.
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Frisch, Jennifer Dawn. « Genetic determination of phragmites and small mammals use of remnant patches along the Central Platte River, Nebraska ». Thesis, University of Nebraska at Kearney, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1588606.
Texte intégralRésumé :
Invasive phragmites (Phragmites australis) has encroached on the central Platte River in recent years potentially out-competing native stands of phragmites. Invasive stands are thought to have an overall negative impact on ecosystems, but do provide ecological benefits to some species as food or shelter. Little research has been conducted on its impacts on small mammals. The goals of this project were to identify potential native and invasive stands along the central Platte River and determine small mammals use of invasive phragmites. I examined 35 phragmites samples along the central Platte River using restriction fragment length polymorphism. I used molecular sequencing and morphological features to identify stands. All samples were determined to be invasive. Four study sites along the Platte River were selected to evaluate phragmites use and potential impacts on small mammals. Each study site was in a wooded grassland area and consisted of three patches of invasive phragmites and three patches of wooded grassland vegetation. Study sites were sampled using Sherman live traps from April to October 2014. I found no significant difference in overall small mammal use between vegetation types and no seasonal difference between use of phragmites and wooded grassland stands. I did, however, catch fewer individuals in both habitat types during August. Deer mice ( Peromyscus maniculatus) selected native vegetation whereas the white-footed mouse (Peromyscus leucopus), meadow vole (Microtus pennsylvanicus) hispid cotton rat (Sigmodon hispidus) and meadow jumping mouse (Zapus hudsonius) selected phragmites. Capture of hispid cotton rat was the first documentation of this species in Dawson County, Nebraska. Differences in selection by these species could be attributed to their different life histories or habitat preferences. The focus of management for invasive phragmites may not need to focus on total eradication. Additional sampling would be required to document the spatial extent of native phragmites stands along the central Platte River.
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Mello, Tatiana Figueira de. « Estrutura da vegetação, cobertura florestal e preferências de uso da paisagem associadas a vertentes : as quase-florestas de São Luiz do Paraitinga ». Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-19042010-105930/.
Texte intégralRésumé :
O município de São Luiz do Paraitinga, SP, originalmente coberto pela Floresta Atlântica estabelecida sobre os mares de morros do Planalto Atlântico, testemunhou o uso intensivo da terra que resultou em uma paisagem onde predominam pequenos fragmentos de floresta secundária. Considerando práticas agrícolas orientadas pela topografia nesta paisagem, avaliei o efeito da orientação e inclinação das vertentes na cobertura florestal e na estrutura da vegetação. Orientadas por aspectos produtivos, as preferências de utilização tiveram efeitos expressivos na configuração da paisagem. Enquanto as pastagens ocorreram preferencialmente nas vertentes mais produtivas (norte/leste), a cobertura florestal concentrou-se nas vertentes opostas e nas áreas mais declivosas, de mais difícil cultivo e acesso. A regeneração florestal ocorreu preferencialmente nas vertentes sul e nas maiores declividades, enquanto o desmatamento relativo foi maior nas vertentes norte/leste. Podemos apontar na configuração da paisagem uma origem híbrida, determinada pelas preferências (atributos culturais) e topografia (atributo natural), associados, que não poderia ser explicada por domínios separados de natureza e cultura. A estrutura da vegetação dos fragmentos desta paisagem está correlacionada apenas parcialmente com intervenções humanas que dependem da topografia, podendo sofrer influência, também, de intervenções associadas a outros elementos da paisagem, como a propriedade rural. As ações humanas, suas origens variadas e seus efeitos sobre a vegetação podem ser mais bem compreendidos de forma contextualizada, associados aos processos sociais em curso na paisagem. Ao incluirmos a ação humana nos modelos de paisagem, podemos compreender melhor os processos envolvidos na produção (e degradação) destas paisagens e ficar mais aptos a elaborar propostas de conservação adequadas às paisagens fragmentadasThis study was carried out in São Luiz do Paraitinga a county located in a hilly area in Southeastern Brazil that was originally covered by Atlantic Rainforest. The region has a history of intensive land use which resulted in a severely fragmented landscape. Under the hypothesis that agricultural practices and topography are closely linked in this landscape, I evaluated the effect of slopes orientation and inclination in forest cover and vegetation structure. Land use preferences had significant effects in shaping the landscape. While land use occurred mainly in most productive slopes (north/east), forest covered preferentially south and west facing slopes and steeper slopes. Forest regeneration occurred mainly on south facing slopes and steeper slopes, while deforestation was higher on north/east facing slopes. We propose that the landscape configuration has a hybrid origin, a product of the interplay between human choices (cultural attributes) and topography (a natural attribute), and which could not be explained by separate domains of nature and culture. Vegetation structure was only partly correlated with human interventions that are related to topography, and could also be influenced by actions related to other landscape elements, such as rural properties. Human actions, their varied origins and their effects on vegetation can be better understood if linked to social processes. Hence, if we want to improve our understanding on landscapes production and degradation, as well as propose conservation strategies appropriate to fragmented landscapes we need to explicitly include human activity in our landscape models.
Livres sur le sujet "Remnants used in"
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Baker, Annette. Peace Parkland native grassland stewardship program 2001/02. Edmonton : Alberta Sustainable Resource Development, Fish & Wildlife Division, Resource Data and Species at Risk Section, 2002.
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Moreira, Inês. Edifícios & vestígios : Projeto-ensaio sobre espaços pós-industriais = Buildings & remnants : essay-project on post-industrial spaces. Lisbon, Portugal] : Imprensa Nacional-Casa da Moeda, 2013.
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United States. President (2001- : Bush) et United States. Congress. Senate. Committee on Foreign Relations, dir. Protocol III to the 1949 Geneva Convention and an amendment and protocol to 1980 Conventional Weapons Convention : Message from the President of the United States transmitting the Protocol Additional to the Geneva Conventions of 12 August 1949, and relating to the adoption of an additional distinctive emblem (the "Geneva Protocol III"), adopted at Geneva on December 8, 2005, and signed by the United States on that date, the amendment to Article I of the Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons Which May be Deemed to be Excessively Injurious or to have Indiscriminate Effects (the "CCW Amendment"), and the CCW Protocol Explosive Remnants of War (the "CCW Protocol V"). Washington : U.S. G.P.O., 2006.
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Vickers, Dr Glen A. Faith and Belief : Remnants of Our Ancestry Used to Enslave Our Minds. CreateSpace Independent Publishing Platform, 2016.
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Marciniak-Kajzer, Anna. Archaeology on Medieval Knights’ Manor Houses in Poland. Wydawnictwo Uniwersytetu Łódzkiego, 2016. http://dx.doi.org/10.18778/8088-002-3.
Texte intégralRésumé :
The relicts of medieval knights’ manor houses in Poland today are so called “grodziska stożkowate” (motte) - the anonymous hills having in themselves remnants of wooden buildings, exceptionally made of stone or brick and numerous tiny artifacts being the trace of the past household equipment. Unlike to the castles they are not so often visited but more often destroyed. The book presents the image of medieval knights’ manor houses, which we know due to archaeological excavations carried on for half a century. Description of buildings household equipment and movables used by the people of the past was completed by transfers from written sources which allows for better understanding the live of medieval knights’ family.
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Allen, Frederic D. Remnants Of Early Latin : Selected And Explained For The Use Of Students. Kessinger Publishing, LLC, 2007.
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Allen, Frederic D. Remnants Of Early Latin : Selected And Explained For The Use Of Students. Kessinger Publishing, LLC, 2007.
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Allen, Frederic De Forest. Remnants of Early Latin : Selected and Explained for the Use of Students. Creative Media Partners, LLC, 2022.
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Jewell, Melissa A. Small mammal community structure and habitat use in remnant and restored prairies. 1992.
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Allen, Frederic Forest De. Remnants of Early Latin, Selected and Explained for the Use of Students by F. D. Allen. Creative Media Partners, LLC, 2018.
Trouver le texte intégralChapitres de livres sur le sujet "Remnants used in"
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Takabe, Hideaki. « Self-Similar Solutions of Compressible Fluids ». Dans Springer Series in Plasma Science and Technology, 149–96. Cham : Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-45473-8_4.
Texte intégralRésumé :
AbstractStrong shock waves are used to compress and heat any matters in the laboratory. The ablation pressure by intense laser is used to compress even solid matters. In plane geometry, it is easier to design multi-shocks to compress the matters, while it is more beneficial to use the spherical compression. No simple solutions are available to know the trajectories of shocks in one-dimensional spherical symmetry. Here we see several analytical solutions with the self-similar method. The method is to find new governing solution of ordinary differential equation from partial differential fluid equations. The self-similar method is known before the birth of computer.The blast wave is the most famous one. Here, we review the basic method to derive several self-similar solutions allowing the spherical implosion, useful to laser driven implosion. The isobaric solution provides uniform pressure and spark-main fuel structure, and isochoric solution gives us uniform density profile at the maximum compression. It is shown that even including thermal conduction, it is possible to find a solution of ablation structure. This is an extended solution more appropriate compared to the steady state solutions shown in the previous chapter.The blast waves are widely used from laser experiments to supernova remnants (SNRs). SNRs are blast waves driven by the matters exploding by supernova explosion. A self-similar solution with forward and reverse shock waves is found to explain many observation data of SNRs. A numerical simulation shows that the solution of ejecta-driven shock changes from Chevalier’s self-similar solution to the other Sedov-Taylor one. The self-similarity is one of the key physics controlling nonlinear hydrodynamic equations.
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Shulkin, Barry, et Thomas Neil Pascual. « Thyroid ». Dans A Practical Guide for Pediatric Nuclear Medicine, 57–74. Berlin, Heidelberg : Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-67631-8_5.
Texte intégralRésumé :
AbstractThyroid imaging, one of the earliest scanning tests, is used in children to determine the cause of congenital and acquired thyroid diseases. It should be interpreted in conjunction with the patient’s clinical picture, thyroid function tests, history of medication and diet, physical examination, thyroid function tests, and ultrasound. Congenital hypothyroidism (CHT) is usually detected on newborn screening. Ectopic thyroid and thyroid aplasia may result in hypothyroidism requiring lifelong hormone replacement therapy. In the presence of a normally positioned, fully developed thyroid, CHT can be transient. Evaluation of acquired benign thyroid disease in children is occasionally supplemented by radioactive iodine uptake tests and can be an aid in therapeutic decisions. Thyroid cancer is the most common endocrine malignancy in children and represents up to 2% of all cancers diagnosed by the age of 20 years, more common in teenagers. It is diagnosed in 25% of thyroid nodules in children, as compared to 10–15% in adults. Children with thyroid cancer present with more advanced disease than adults, including multifocal primary and a higher incidence of regional and distant metastases. Cervical lymph node metastases are diagnosed in 50% and lung metastases in 20% of cases. 131I, a suboptimal agent for imaging, has been largely replaced by 123I and 99mTc-pertechnetate. 131I is at present used mainly for therapeutic purposes in hyperthyroidism, ablation of thyroid remnants following thyroidectomy, and for treatment of thyroid cancer.
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Alamin, Suzan, et Gertrud Schneider-Blum. « Chapter 3. A cautious approach to spatial orientation in Tima ». Dans Culture and Language Use, 49–82. Amsterdam : John Benjamins Publishing Company, 2024. http://dx.doi.org/10.1075/clu.23.03ala.
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This study investigates two subdomains within the semantic field of space among the Tima in Sudan: first, topology (and toponymy), and second, frames of reference. Like many European languages, Tima uses adpositions to indicate a goal/location and a source. Furthermore, Tima uses locative prefixes (remnants of a noun class system) to designate an area. With respect to frames of reference, we show that Tima uses a mixed system, availing of all major frames, i.e., absolute, intrinsic, and relative. The data at our disposal suggests that mobility as well as the shape of figure and ground play a role in the encoding of spatial relations in Tima, a hypothesis which needs testing with more data.
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Avram, Anca M. « Radioiodine Theranostics of Differentiated Thyroid Carcinoma ». Dans Integrated Diagnostics and Theranostics of Thyroid Diseases, 111–27. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35213-3_7.
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AbstractCurrent management of patients with thyroid cancer requires a risk-adapted approach to treatment and multidisciplinary cooperation. Routine use of 131-I administration after total thyroidectomy is no longer recommended as this approach has been challenged by evidence that remnant ablation does not improve survival in low-risk patients. However, therapeutic 131-I administration in intermediate- and high-risk patients demonstrated significant benefits in improving overall survival. Radioiodine (131-I Na-I) is the classic agent used for the diagnosis and treatment of differentiated thyroid cancer (DTC) based on sodium–iodine symporter expression in normal and neoplastic thyroid tissues permitting the integration of diagnostic imaging and therapeutics using the same radionuclide (i.e., theranostics) targeting specific characteristics of tumor biology. Radioiodine theragnostics involves the acquisition of pre-ablation diagnostic scans (Dx Scans) to guide patient-individualized targeted 131-I therapy with goal of maximizing the benefits of the first therapeutic 131-I administration. Current imaging technology with hybrid SPECT/CT gamma camera systems has improved the capability of diagnostic radioiodine scintigraphy for identifying regional and distant metastatic disease and this imaging information can be used for 131-I treatment planning and delivery of activity-adjusted 131-I therapy for achieving intended treatment goals (e.g., remnant ablation, adjuvant treatment, and treatment of known disease). The goal of radioiodine theragnostics is to optimize the balance between 131-I therapeutic efficacy and potential side effects on non-target tissues. This chapter summarizes the new concepts and essential information at the core of multidisciplinary DTC management, which emphasizes individualization of 131I therapy according to the patient’s risk for tumor recurrence to maximize benefit and minimize morbidity.
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Hoeve, F., S. Terpstra, P. van de Camp et R. Paleja. « Tools for Analysing Large Numbers of Inspection Data, Used to Asses Remnant Life of Pipework ». Dans Engineering Asset Management, 1090–97. London : Springer London, 2006. http://dx.doi.org/10.1007/978-1-84628-814-2_119.
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Erkan, Yonca. « Change in Water Technology in Anatolia : From Use to Energy, Conflicts to Climate Action ». Dans 50 Years World Heritage Convention : Shared Responsibility – Conflict & ; Reconciliation, 309–20. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05660-4_24.
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AbstractUNESCO World Heritage properties in Anatolia show a great variety in their land use morphologies as a response to their environmental differences, developing different ways of managing water for daily use and agricultural irrigation. History testifies to the many conflicts and wars that occurred in defending and/or accessing these important water resources. The remnants of this infrastructure form part of invaluable cultural heritage and present opportunities for the embodied traditional knowledge to mitigate the impacts of climate change. However, ruthless water regimes (i.e. hydroelectric plants), which disregard the importance of water for communities, have prioritized water as a source of energy over its value for daily and agricultural use and have impacted the environment and climate, which directly affects both tangible and intangible cultural heritage. Dried creeks leave water-related infrastructure and equipment without a purpose and people deprived of water. In the age of Anthropocene, such an approach victimizes people through the idea of taking over nature while at the same time making people the victims of nature’s response. In return, new regional conflicts are instigated, and migration becomes inevitable, diminishing neighbourly peace and also aggravating climate change, causing negative impacts on cultural heritage and jeopardising many of the UN Sustainable Development Goals.
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Samejima, Hiromitsu, Motoko S. Fujita et Ahmad Muhammad. « Impact of Industrial Tree Plantation on Ground-Dwelling Mammals and Birds in a Peat Swamp Forest in Sumatra ». Dans Global Environmental Studies, 69–87. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0906-3_4.
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AbstractPeat swamp forests are one of the unique ecosystems of Southeast Asia. These forests are not only a large carbon stock, but also a refuge for rich biodiversity. To understand the faunal composition and the effect of land-use changes in peat swamp forests, we investigated ground-dwelling mammals and birds using camera traps in a natural peat swamp forest and acacia forests planted in two industrial tree plantations in the Giam Siak Kecil-Bukit Batu Biosphere Reserve, Riau, Indonesia, in the Island of Sumatra.We obtained a total of 1856 records, comprising 23 species and including 11 vulnerable or endangered species, in ten plots. The range of mean trapping rates (number of records per 100 camera working days) of all animals in each plot in natural peat swamp forests were 9.22–51.85 (mean: 29.16) and 8.75–31.76 (16.42) in the wildlife reserve and protected area of the plantations respectively. The range in planted acacia forest was 2.29–6.38 (4.02). Few species were recorded in the planted acacia forests, and the species composition was different from that in the natural peat swamp forests. These differences indicate that conversion from natural peat swamp forests to planted acacia forest through development of industrial tree plantations resulting in decreased density and species richness of ground-dwelling mammals and birds. Because the ground-dwelling mammal and bird community in natural peat swamp forest is vulnerable to land use change, conservation of the remnant natural peat swamp forests and appropriate landscape design of industrial tree plantations are considered important to maintain the ecosystem.
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Seidman, Louis Michael, et Mark V. Tushnet. « Conclusion : The Case for Skeptical Commitment ». Dans Remnants Of Belief, 190–202. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195099805.003.0009.
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Abstract Constitutional rhetoric is the language of American politics. Or at least it used to be. Could it be that our ancient obsession with constitutional argument is finally coming to an end? Consider, for example, President Clinton’s first two nominations to the Supreme Court. Superficially, it might appear that the president’s extended public agonizing over these appointments reflects the continuing importance of constitutional law. We believe it suggests just the opposite.
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« 2. Ethnographic Remnants : Range and Limits of the Social Method ». Dans Fieldwork Is Not What It Used to Be, 52–72. Cornell University Press, 2017. http://dx.doi.org/10.7591/9780801463594-004.
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Jaffrelot, Christophe, et Pratinav Anil. « Subverting Institutions Remnants of Democracy ». Dans India's First Dictatorship, 97–124. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197577820.003.0004.
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This chapter highlights the peculiar phenomenon of both the judiciary and the parliament at least formally and legally being allowed to continue functioning under the Emergency. It analyses the manner in which institutions—in particular the Lok Sabha—gave India a façade of parliamentarism while lawmakers were imprisoned. This fiction of remaining within the confines of legality was maintained by the regime despite the fact that judges had lost much of their independence at the hands of the executive. In fact, this gave both the judiciary and the parliament some room to function. However, this was not the case when it came to public sector undertakings, especially for the Reserve Bank of India and the banking sector. These institutions were completely controlled by the state and dependent on its whims. They were subject to nepotism and used to settle personal scores.
Actes de conférences sur le sujet "Remnants used in"
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Sutton, Mauri, George Geoghegan, Kenneth Schopen, Kathleen Kingma, Steve Castro, Kyle Wesley, Jack Yahl et Frank Soto. « Non-Chemical Solder Bump Removal Technique for Repackaging Flip Chip ICs ». Dans ISTFA 2012. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.istfa2012p0485.
Texte intégralRésumé :
Abstract In this paper we will discuss an empirically discovered technique to remove residual solder bumps or remnants using reflow and wicking to a gold plated surface rather than mechanical or chemical means. Extraction of flip chip ICs, for the purpose of repackaging, can leave bond pads in inconsistent and undesirable conditions such as 1) retaining remnants of the solder bumps or 2) damaged or eliminated pad metal caused by acid or mechanical means used to separate the IC from the board. These conditions hinder subsequent wire bonding and probe card use. Though other techniques have been found to be suitable at times, the technique described in this paper consistently leaves the bonding area in an acceptable, more predictable condition, as the bulk of the solder bump material is removed. This lends to a higher wire bonding success rate.
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Kovács, Attila, Ákos Horváth, Márta Horváth, Ildikó Szenthe et Ferenc Gillemot. « Reconstituted Mini Tensile Specimens ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84760.
Texte intégralRésumé :
In order to evaluate the fracture toughness and Master Curve, the exact values of the tensile and yield strengths determined at the fracture toughness testing temperature are required. The fracture toughness should be measured around the T0 reference temperature to obtain valid results. Tensile properties — if exists — are generally measured at room temperature, and at the maximum operation temperature of the pressure vessel. If T0 reference temperature is different from these temperatures a correction formula is used for interpolation or extrapolation. Several times even no reliable tensile results are available, especially in the case of irradiated specimens. Use of irradiated Charpy remnants is a solution to produce tensile bars. A specific method has been developed to produce 12 pieces of flat 2*1 mm cross section tensile specimens made from one half Charpy specimens using stud weld reconstitution. The specimen cutting is made using thin molybdenum wire spark cutting. In order to do so difficulties of handling the small radioactive specimens needed to be solved, special grips were developed for the tensile machine to clamp the miniature tensile specimens. A laser extensometer was used to measure the strain and a video microscope was used to determine the cross section after the fracture without touching the specimen. The paper presents the results obtained on more than 200 irradiated small tensile specimens. These results had been compared to the old surveillance ones.
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O̸kland, Ole David, Egil Giertsen, Svein Sævik et Joakim Taby. « On the Use of Online Monitored Key Parameters From Pipe Lay Operations ». Dans ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57371.
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For pipe lay operations parameters like heading and position of the lay vessel, lay-back and information about feeding of joints are usually collected and stored by the contractor. Many lay vessels are also equipped with a MRU unit for measurements of dynamic vessel motions, and in some cases the current profile is also monitored. This is especially the case for pipes with low bending stiffness and low ratio between weight and drag diameter (i.e. small pipe diameter) where current is important for the configuration of the pipe catenary. Together with the seabed these parameters constitutes the boundary conditions for a nonlinear time domain analysis of the lay operation. Such an analysis approach will have a wide range of application areas, from online monitoring to realistic back-calculation of a lay operation. During recent year’s work with the Ormen Lange field (see Figure 1) Marintek has developed a new generation of 3D pipeline analysis tools. Ormen Lange is the largest natural gas field on the Norwegian continental shelf. The field is situated 120 km northwest of Kristiansund. The seabed depths in the reservoir area vary between 800–1100m, and the terrain is very rough due to remnants from the Storegga slide. In the period 2006–2007 two 30" import lines, two MEG lines, and two umbilicals were installed at the Ormen Lange field. In the present paper monitored data collected during the installation of the 30" pipelines are used to back-calculate the lay operation. The agreement between observed and calculated lay parameters are reported and discussed.
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Shipkova, L. N., N. V. Shipkov, S. V. Kalmanovich et A. K. Cherednichenko. « TOXOPLASMOSIS AMONG THE POPULATION OF THE KRASNODAR TERRITORY ». Dans THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL. All-Russian Scientific Research Institute for Fundamental and Applied Parasitology of Animals and Plant – a branch of the Federal State Budget Scientific Institution “Federal Scientific Centre VIEV”, 2023. http://dx.doi.org/10.31016/978-5-6048555-6-0.2023.24.544-548.
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The existing interest in the problem of toxoplasmosis is largely due to the fact that
Toxoplasma gondii plays a significant role in human pathology. Toxoplasmas enter
the human body in many ways: through the mouth when eating raw meat; with
contaminated products, vegetables or fruits; with dirty hands, after contact with
infected animals; through damaged skin, mucous membranes, when removing
skins from infected animals or dividing carcasses; in medical procedures in
patients with toxoplasmosis; and prenatally, from mother to fetus. Toxoplasmosis
is more common in children, while adults may remain asymptomatic carriers of the
pathogen. The reliability of invasion in humans is only established by the detection
of toxoplasma in the blood, sputum, cerebrospinal fluid, puncture samples of lymph
nodes, remnants of fetal membranes, placenta, etc. Therefore, the purpose of our
study is to determine the occurrence of toxoplasmosis in the Krasnodar Territory
for 5 years (2018–2022) and to identify organ systems that are affected most often.
Toxoplasmosis is widespread in the Krasnodar Territory. This is due to climatic
and geographical features. The study used data from outpatient medical records of
people with diagnosed toxoplasmosis who seek medical advice in infectious diseases
hospitals of the Krasnodar Territory.
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Soli, Alessandro, et Ivan Langella. « Numerical Investigation of a Coupled Blow-Off/Flashback Process in a High-Pressure Lean-Burn Combustor ». Dans ASME Turbo Expo 2022 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82163.
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Abstract Large eddy simulation is used to investigate the flashback mechanism caused by the combustion-induced vortex breakdown (CIVB) in a high-pressure lean-burn annular combustor with lean direct injection of kerosene. A single sector of the geometry, including a central pilot flame surrounded by a main flame, is simulated at take-off conditions. A previously-developed flamelet-based approach is used to model turbulence-combustion interactions due to its relatively low cost, allowing to simulate a sufficiently long time window. In stable operations, the flame stabilises in an M-shape configuration and a periodic movement of the pilot jet, with the corresponding formation of a small recirculation bubble, is observed. Flashback is then observed, with the flame accelerating upstream towards the injector as already described in other studies. This LES, however, reveals a precursor partial blow-out of the main flame induced by a cluster of vortices appearing in the outer recirculation region. The combined effect of vortices and sudden quenching alters the mixing level close to the injector, causing first the main, then the pilot flame, to accelerate upstream and initiate the CIVB cycle before the quenched region can re-ignite. Main and pilot flames partly extinguish as they cross their respective fuel injection point, and re-ignition follows due to the remnants of the reaction in the pilot stream. The process is investigated in detail, discussing the causes of CIVB-driven flashback in realistic lean-burn systems.
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Gillemot, Ferenc, Márta Horváth, Ákos Horváth, Ildikó Szenthe et Attila Kovács. « Master Curve Testing on Reconstituted Surveillance Charpy Specimens ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84749.
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The original WWER-440 surveillance had 6 sets of specimens and each set had 12 Charpy, 12 COD (crack opening displacement) and 6 tensile specimens made from base material, weldment and HAZ (heat affected zone). The Charpy size precrack TPB (three point bend) COD specimens were located at the end of the chains, where the flux is rapidly decreasing. During the period of 1970–90, when the WWER-440-V213 units were designed, built and started to operate, the Charpy impact transition curve measurement was the accepted method to evaluate the radiation embrittlement. The technology and the standards to use small size fracture mechanical specimens in surveillance capsules were not developed at the time period when most of the second generation reactors — including the WWER-440 V 213 type — were designed, therefore the fracture toughness specimens were considered less interesting for the utilities and the safety authorities. Fracture toughness curves were elaborated in the laboratories on large size unirradiated specimens and radiation embrittlement adjustments were made according to the Charpy shift. However, during the past 30 years fracture mechanics has rapidly developed, and the testing moved to the direction of using small and mini sized specimens. The development of the Master Curve evaluation method [4,5] allowed the use of small specimens for fracture toughness testing in surveillance programs, and the results obtained on irradiated specimens may be used directly in the lifetime evaluation. The purpose of this work was to develop a specimen production technology and testing procedure to measure these data using the remnants of irradiated surveillance Charpy specimens, and the comparison of the data calculated from CMOD and LLD on irradiated CrMoV type RPV material and weldment.
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Bang, In Cheol, Won-Pil Baek et Soon Heung Chang. « A Digital Photographic Study on Nucleate Boiling in Subcooled Flow for Water and Refrigerant 134a Fluids ». Dans 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22129.
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The behavior of near-wall bubbles in subcooled flow boiling has been investigated photographically for water flow in vertical, one-side heated and rectangular channels at mass fluxes of 500, 1500, 2000 kg/m2s under atmospheric pressure and for R134a in channels of the same kind at mass fluxes of 1000, 2000 kg/m2s under 7 bar. Digital photographic techniques are used for the visualization, which are rapidly advanced in recent. Primary attention is given to the bubble coalescence phenomenon and the structure of the near-wall bubble layer. At subcooled and low-quality conditions of both fluids, discrete attached bubbles, sliding bubbles, small coalesced bubbles and large coalesced bubbles or vapor clots are observed on the heated surface as the heat flux is increased from a low value. Particularly for R134a, vapor remnants below discrete bubble on the heating surface are observed. Nucleation site density increases with the increases in heat flux and channel-averaged enthalpy, while discrete bubbles coalesce and form large bubbles, resulting in large vapor clots. Waves formed on the surface of the vapor clots are closely related to Helmholtz instability. At sufficiently high heat fluxes, three characteristic layers were observed in the heated channel: (a) a superheated liquid layer with small bubbles attached on the heated wall, (b) a flowing bubble layer consisting of large coalesced bubbles over the superheated liquid layer, and (c) the liquid core over the flowing bubble layer.
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Bird, C. R., et D. Kleiner. « The Phased Array Inspection of Friction Stir Welded Aluminium Plant ». Dans ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51581.
Texte intégralRésumé :
Friction stir welding (FSW) is a relatively new welding process compared to electron beam or arc welding. Unlike most other welding processes there is no liquid state for the weld pool. For this reason the potential defect types present within the weld are quite different from conventional welding defects such as voids or lack of fusion. These can still be present, but defects such as slag or hot tearing due weld pool shrinkage cannot. Other defects more akin to those associated with resistance welding (joint line remnants) are more likely and can be more serious. TWI has run and taken part in a number of projects including the European “Qualistir” project lead by R/D-tech. The object of these projects was to develop a reliable inspection method for determining the quality of FSW in a butt and lap welded configurations. This paper describes the novel method developed by TWI for the detection of the joint line remnant defects. The paper describes the use of back scattered noise analysis for determining whether the weld has been correctly forged and whether the metallurgical structure indicates a good weld. Further to the difficult FSW specific flaws the paper also describes how the inspection procedure detects the more conventional defects.
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Del Rey, Miguel, et Antonio Gallud. « Intervención en el Castillo de Biar. Consolidación de una ruina como alternativa posibilista en la defensa del patrimonio ». Dans FORTMED2020 - Defensive Architecture of the Mediterranean. Valencia : Universitat Politàcnica de València, 2020. http://dx.doi.org/10.4995/fortmed2020.2020.11352.
Texte intégralRésumé :
Biar's Castle intervention. Consolidation of a ruin as a possibilist alternative in the defense of heritageConsolidation of ruin and didactic recovery of the castle's profile dominating the landscape. Almohad fortress that should have been recorded at the beginning of the powerful existing tower, surrounded by a protective wall with adarve, all on steep rocks. The fortress is transformed over time, being in service as a defense between Muslim Spain and Christian Spain in the twelfth and thirteenth centuries, to later, be a point of friction between the Kingdoms of Castilla and Aragón, remaining active until the mid-sixteenth century, with an intervention in the nineteenth century during the Carlist wars. Is located on the top of a hill at 745 m altitude, next to the town. The orography marks a deep slope to the northeast, more than 100 m high, while to the west, falling towards the population, the slope is smoother. Because of its situation, the castle has a very important visual impact, so landscape considerations acquire a special meaning. The intervention is partial on the second walled enclosure and in total ruin, proposing an eloquent restoration that allows to approach its complex history and the construction techniques used, within a strong economy of means in the project and subsequent maintenance. We can restore the image of the courtyard, its spatiality and know the remains of existing buildings. Both, the remnants emptying of crashes, and the restoration of the traces of the internal walls, the various heights of the walls and their guard steps, allow us to understand the whole along the time. The undoubted visual and landscape interest of Biar Castle is a relevant aspect of the intervention.
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А.Е., Леонтьев,, Бейлекчи, В.В. et Бейлекчи, В.В. « RESEARCH OF VYZSHEGSHA HILLFORT, 2020 ». Dans Археология Владимиро-Суздальской земли. Crossref, 2021. http://dx.doi.org/10.25681/iaras.2021.978-5-94375-365-7.38-50.
Texte intégralRésumé :
В раскопе на центральной площадке городища были открыты остатки наземной постройки. Многочисленные находки мелких слитков и лома цветных металлов, литейных форм, обломка тигля указывают на ее вероятное использование в качестве литейной мастерской. Вывод подтверждает химический анализ культурного слоя заполнения постройки, который показал повышенное содержание в его составе элементов меди, свинца, олова. Находка ножа характерной формы позволяет датировать постройку не ранее второй половины VIII в. В коллекции находок многочисленны элементы украшений, характерных для костюма раннесредневекового финского населения Поволжья, в их числе редкий образец височного лопастного кольца. Второй раскоп находился в северо-восточной оконечности центральной площадки городища. Специфика отложений позволяет полагать, что обследованный участок поселения использовался для добычи камня. Лидарная аэросъемка окрестностей городища позволила обнаружить на противоположном левом берегу р. Черной 3 группы курганов Remnants of an above-ground structure were discovered in excavation site 1at the central area of the fortified settlement. Numerous findings of small ingots and scarps of nonferrous metals and findings of casting forms, fragments of troughs indicate that the structure was possibly used as a casting workshop. This conclusion is reinforced by analysis of the occupation layer that filled the structure. Analysis showed an increased content of copper, lead and tin in the occupation layer. Finding of a knife of a very specific shape allows dating the structure which is no earlier than the second half of the 8 century. Numerous elements of adornments specific for dressing of early medieval Finnish population are included in collection of findings. The second excavation site was at the of north-east tip of the central ground of the fortified settlement. Specificity of depositions allows to suppose that that area of settlements wasused for quarrying. The lidar aerial survey allowed discovering three groups of burial mounds at the opposite (left) bank of the Chernaya river and probable location of a fortified settlement that was hitherto unknown.
Rapports d'organisations sur le sujet "Remnants used in"
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Wang, Qiang, Anrong Wang, Zhen Li, Ernesto Sparrelid et Torkel Brismar. Systematic review of the impact of sarcopenia on the future liver remnant growth after portal vein embolization and ALPPS. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, août 2022. http://dx.doi.org/10.37766/inplasy2022.8.0038.
Texte intégralRésumé :
Review question / Objective: Does sarcopenia affect the future liver remnant growth after portal vein embolization/ligation (thus affect the subsequent hepatectomy in patients with liver cancers)? Condition being studied: Portal vein embolization (PVE) and Associating Liver Partition and Portal vein Ligation for Staged hepatectomy (ALPPS) are two commonly used procedures for hypertrophy of the remaining liver before major liver resection in patients with liver cancer. However, around 30% patients who undergo PVE cannot proceed to liver resection due to insufficient liver growth. Many factors may affect liver growth after PVE. This study evaluates the clinical variables affecting liver growth after portal vein embolization/ligation in patients with liver cancers.
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Böhm, C., et N. Rayner. Summary of GEM results : Manitoba Far North Geomapping Initiative. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332503.
Texte intégralRésumé :
The far north of Manitoba is endowed with potential for base and precious metals, diamonds, uranium, and rare metals. The goal of a collaborative project between the Manitoba Geological Survey and the Geological Survey of Canada was to provide an advanced framework of geoscience knowledge for mineral exploration and land-use management. Bedrock mapping, geophysical surveys, and geochemical and geochronological analyses carried out in 2005 to 2011 in the far north of Manitoba showed diverse and complex rocks that record nearly two billion years of Earth history. Key advancements in understanding include a new stratigraphy and chronology of at least four metasedimentary cover sequences in the Seal River Domain, some with high potential for economic uranium, gold, and/or rare-metal mineralization; and the identification of a Neoarchean greenstone belt in the Great Island area with known gold occurrences. The discovery of remnants of ancient (3.5 Ga) cratonic lithosphere in the Seal River area also renders the region favourable for diamond exploration.
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Krause, Thomas, Mehrdad Keshefi, Ross Underhill et Lynann Clapham. PR652-203801-R02 Magnetic Object Model for Large Standoff Magnetometry Measurement. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), septembre 2021. http://dx.doi.org/10.55274/r0012151.
Texte intégralRésumé :
Ferromagnetic pipeline steel may exhibit magnetization, even in the absence of applied magnetic fields, due to remnant fields or the presence of pipe wall stress. Remnant magnetization may be present from previous or existing exposure to a magnetic field, while pipe wall stress induced magnetization can result from line pressure, environmental stresses due to settling or geohazard conditions, and residual stresses due to nonuniform plastic deformation caused by manufacturing processes, installation or operating conditions. The local stress state of the pipeline may also be altered by corrosion or damage. The physical basis for magnetization in pipelines due to intrinsic and resident stresses is examined here using the magnetic object (MO) model. MOs are characterized as regions of relatively independent magnetic behaviour, typically about the size of a ferromagnetic steel grain, to which expressions for the magnetic energy of local domain structures can be applied. The lowest energy state for an MO is a flux-closed structure, but the presence of stress can modify the MO energy through inverse magnetostrictive effects on the domain structure and thereby, produce a state of magnetization. This magnetization may be altered by the introduction of additional stress sources including pressurization of the pipe, geological-environment effects, sources of magnetization that include the proximity of other ferromagnetic pipes, even those comprising sections of the same pipeline, and changes in the pipe structure that may be brought about by deformation, corrosion or cracking. This work shows that the fundamental building block of the MO, combined with considerations of overall changes in domain structure due to these factors, can be used to model the generation of magnetic fields measured outside of pipeline structures. This will have implications for understanding sources of pipeline magnetization that are passively measured above buried oil and gas pipelines with the objective of detecting anomalous conditions that may indicate compromised conditions for safe pipeline operation.