Literatura científica selecionada sobre o tema "Positive slope"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Índice
Consulte a lista de atuais artigos, livros, teses, anais de congressos e outras fontes científicas relevantes para o tema "Positive slope".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Artigos de revistas sobre o assunto "Positive slope"
1
Peng, Yao, Jun Huang, Shao Bin Dai e Ting Yuan. "Dynamic Analysis on the Light-Weight Portal Frame with Different Slopes". Applied Mechanics and Materials 405-408 (setembro de 2013): 775–80. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.775.
Texto completo da fonteResumo:
Build up a group of light-weight portal frame models with different slopes by SAP2000 software. Conduct dynamic time-history analysis on light-weight portal frame models with different slopes under the EI Centro wave. The results show that: The maximum positive and negative displacement and acceleration of the light-weight portal frame presents a variation rule as the the slope increasing; the influence of the slope on the maximum positive and negative displacement of the frame is relatively small, while it is big on the maximum positive and negative acceleration; the acceleration amplification coefficient of the frame decreases as the slope increasing when the slope exceeds a limit, which show that the earthquake damage of the large slope light-weight portal frame increases as the slope increasing.
2
Grabowecky, Marcia, Stacey Parrott, Emmanuel Guzman-Martinez, Laura Ortega e Satoru Suzuki. "Auditory–visual, positional, and semantic effects in visual extraction of slope". Seeing and Perceiving 25 (2012): 196. http://dx.doi.org/10.1163/187847612x648251.
Texto completo da fonteResumo:
Extracting slopes from arrays of visual features is crucial for interpreting graphs. To understand broader influences on slope perception, we investigated the effects of concurrent sounds, of relative graph location, and of semantic priming on a visual search task in which observers searched for a graph with a positive or negative slope. Four bar graphs or scatter plots were simultaneously presented in separate quadrants of a visual display. Participants pressed a key as quickly as possible if one of the graphs displayed the target slope and otherwise refrained from response. A concurrently presented ascending pitch slowed responses to negative-slope targets, and concurrently presented descending pitch slowed responses to positive-slope targets, indicating crossmodal interference. This interference was eliminated when the sounds were presented 200 ms before the graphs, consistent with crossmodal interaction rather than response bias. Positive slopes were detected slowest in the upper-left quadrant whereas negative slopes were detected slowest in the upper-right quadrant, suggesting that slope detection is impeded when a graph is placed inconsistently with a mental number-line representation (negative values on the left and positive values on the right). Finally, positive slopes were detected faster when the search display was immediately preceded by a briefly flashed word ‘uphill’ compared to the word ‘downhill’ (and the converse for negative slopes), indicating a semantic priming effect, but this was observed only for scatter plots (the stimulus specificity precluding response bias). In summary, perception of visual slope is systematically influenced by auditory signals, by location of graphs, and by semantic priming.
3
Zhao, Zi Chao, Wen Nian Xu e Dong Xia. "Soil Nutrient and Soil Enzyme Activity of the Slopes with Different Ecological Protection Technologies". Advanced Materials Research 356-360 (outubro de 2011): 2445–50. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2445.
Texto completo da fonteResumo:
Taking four types of slopes as test objects this paper measured their, soil nutrient and soil enzyme activity. The results showed that variation of soil nutrients in different slopes is obvious; soil enzyme activity is also a significant difference between different slopes. The soil of A slope (natural secondary forest ) was the highest in activity of urease, invertase, neutral phosphatase and catalase, the lowest in D(wasteland)slope except catalase. There were extremely significant positive correlations among soil urease activity, invertase activity and neutral phosphatase activity. Significant positive correlations were observed between soil urease activity, invertase activity, neutral phosphates activity and organic matter, available N, total N. It suggested that enzymatic activity could be used to indicate and estimate soil fertility of artificial remediation slopes. Combined with and community structure and community characteristics of vegetation on the sanmpled slops, soil enzyme activities could be used to measure the degree of vegetation restoration in the disturbed area.
4
Debabeche, Mahmoud, Sonia Cherhabil, Amin Hafnaoui e Bachir Achour. "Hydraulic jump in a sloped triangular channel". Canadian Journal of Civil Engineering 36, n.º 4 (abril de 2009): 655–58. http://dx.doi.org/10.1139/l08-136.
Texto completo da fonteResumo:
The hydraulic jump in a sloped triangular channel of 90° central angle is theoretically and experimentally examined. The study aims to determine the effect of the channel's slope on the sequent depth ratio of the jump. A theoretical relation is proposed for the inflow Froude number as function of the sequent depth ratio and the channel slope. An experimental analysis is also proposed to find a better formulation of the obtained relation. For this motive, six positive slopes are tested. The relations obtained are recommended for designing irrigation ditches.
5
Deng, Xiaopeng, e Xinghua Xiang. "Fuzzy Comprehensive Evaluation Method for Evaluating Stability of Loess Slopes". Advances in Civil Engineering 2023 (23 de novembro de 2023): 1–15. http://dx.doi.org/10.1155/2023/6692746.
Texto completo da fonteResumo:
The stability assessment of loess slopes is of great significance for slope reinforcement and safety assessment. This research studies the main factors affecting the stability of the loess slope through the summary and analyzes the failure cases of the loess slope in Shaanxi Province. The importance of influencing factors was studied through numerical simulation method, sensitivity analysis method, and gray correlation analysis method, and the weight value method was given. On this basis, we have developed the fuzzy comprehensive evaluation model method for assessing the stability of loess slopes based on the principle of maximum membership degree. Finally, the method was applied to the stability analysis of the actual loess slope, and the rationality and correctness of the loess slope stability evaluation method proposed in this paper were demonstrated. The results showed that, for the Shaanxi loess slope, the probability of instability of the positive slopes is far greater than that of negative slopes; the greater the slope gradient, the more unstable the loess slopes. Collapse mainly occurs in the range of 10–40 m slope height. There is a significant positive correlation between rainfall and the probability of loess landslides. The degree of correlation between the factors influencing slope stability and the safety factor can be categorized from strong to weak as follows: slope inclination > internal friction angle > height of the slope > gravitational forces > cohesion > Poisson’s ratio > modulus of elasticity, and the influence of Poisson’s ratio and elastic modulus can be ignored. The fuzzy comprehensive evaluation method based on the gray correlation degree method established in this paper was used to evaluate the stability of the loess slopes. The evaluation results attested to the actual data of slope monitoring. The evaluation method proves reasonable and feasible and can be well applied to the stability analysis of the loess slopes.
6
Naqellari, Alqi. "Positive Slope Model of Aggregate Demand". Academic Journal of Interdisciplinary Studies 7, n.º 3 (1 de novembro de 2018): 63–85. http://dx.doi.org/10.2478/ajis-2018-0059.
Texto completo da fonteResumo:
Abstract This paper analyzes Internal Aggregate Demand. This aggregate, along with other production indicators, is the main indicator of the country’s economic performance rate. Objective analysis is important for their perspective, as well as for a set of other related indicators, such as inflation rate, unemployment rate, etc. In economic theory, the Aggregate Demand Curve (AD) deals with negative slope. At the point where AD interrupts the AS (aggregate supply curve) there is macroeconomic equilibrium. Creating this equilibrium, shifting curves, creates a number of other figures that show how the level of output, prices and employment will be, and overall the level of economy in the future. In this study, with the data of the Albanian economy, was built, for a period of 17 years, the Internal Demand Curve. Three effects are analyzed: the real balance sheet effect, the interest rates and the external trade effect. The internal demand curve has resulted in a Positive Slope. The equilibrium is not created at the intersection point of the curves. These curves stand facing each other. The equilibrium is set by the different aggregate price level. The Gross Domestic Product Curve (GDP) is the equilibrium curve created by the interaction of Aggregate Demand and Aggregate Supply. This position is real, and creates opportunities for objective analysis of the economy. This paper uses econometric, statistical, comparative and synthesis methods.
7
Krisnanto, Sugeng, e Harianto Rahardjo. "Characteristics of Rainfall-Induced Slope Instability in Cisokan Region, Indonesia". Journal of Engineering and Technological Sciences 53, n.º 5 (22 de outubro de 2021): 210504. http://dx.doi.org/10.5614/j.eng.technol.sci.2021.53.5.4.
Texto completo da fonteResumo:
A 25.5 km long access road has been constructed in a hilly area in Cisokan region. Several slope instabilities occurred during the rainy season, particularly at the end of heavy rainfall. A comprehensive study was performed to understand the characteristics of rainfall-induced slope instability. The study consisted of field observation, analyses of field and laboratory test data, and numerical analyses. The study revealed that in general there were two categories of slopes with instability characteristics: (i) slopes with a significant groundwater level increase during rainfall; (ii) slopes with an insignificant groundwater level increase during rainfall. In the first category, the slope instability was caused by a loss of matric suction and eventually the pore-water pressure, uw became positive as indicated by an increase of the groundwater level. In the second category, the slope instability was caused by a loss of matric suction without a rise in pore-water pressure, uw, to a positive magnitude. Two empirical curves of slope stability were developed as a preliminary guidance to assess slope stability during rainfall in the region.
8
Lorinc, Z., J. Derr, M. Snider e R. Lydic. "Defining origin of positive slope in hypercapnic ventilatory response curve". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 261, n.º 3 (1 de setembro de 1991): R747—R751. http://dx.doi.org/10.1152/ajpregu.1991.261.3.r747.
Texto completo da fonteResumo:
The sensitivity to CO2 as a respiratory stimulant has traditionally been studied by exposing organisms to progressively increasing levels of inspired CO2 while measuring the corresponding increase in minute ventilation (V). Plots of V as a function of end-tidal CO2 concentration reveal a complex function with a "dogleg" shape. Only the positive slope of the V function is taken as an index of chemosensitivity, but the starting points for such analyses are often chosen arbitrarily. This paper examined the hypotheses that the range of CO2 concentrations over which V slopes are compared may be mathematically defined and that arbitrary choices of this analytic range may influence conclusions about the hypercapnic ventilatory response (HCVR). Three mathematical models attempted to define the origin of the positive slope for the HCVR curve using empirically derived data. The results revealed good agreement that the origin of the positive HCVR slope may be reliably defined by a point that joins the horizontal and positive slope of the HCVR curve. In addition to identifying the "joint-point" statistic, the results suggest that arbitrarily defining the range of CO2 values over which V is analyzed can be replaced by quantitative approaches for identifying the origin of the ventilatory response to hypercapnia.
9
Javankhoshdel, Sina, e Richard J. Bathurst. "Influence of cross correlation between soil parameters on probability of failure of simple cohesive and c-ϕ slopes". Canadian Geotechnical Journal 53, n.º 5 (maio de 2016): 839–53. http://dx.doi.org/10.1139/cgj-2015-0109.
Texto completo da fonteResumo:
This paper focuses on the calculation of probability of failure of simple unreinforced slopes and the influence of the magnitude of cross correlation between soil parameters on numerical outcomes. A general closed-form solution for cohesive slopes with cross correlation between cohesion and unit weight was investigated and results compared with cases without cross correlation. Negative cross correlations between cohesion and friction angle and positive cross correlations between cohesion and unit weight, and friction angle and unit weight were considered in the current study. The factors of safety and probabilities of failure for the slopes with uncorrelated soil properties were obtained using probabilistic slope stability design charts previously reported by the writers. Results for cohesive soil slopes and positive cross correlation between cohesion and unit weight are shown to decrease probability of failure. Probability of failure also decreased for increasing negative cross correlation between cohesion and friction angle, and increasing positive correlation between cohesion and unit weight, and friction angle and unit weight. Probabilistic slope stability design charts presented by the writers in an earlier publication are extended to include cohesive-frictional (c-[Formula: see text]) soil slopes with and without cross correlation between soil input parameters. An important outcome of the work presented here is that cross correlation between random values of soil properties can reduce the probability of failure for simple slope cases. Hence, previous probabilistic design charts by the writers for simple soil slopes with uncorrelated soil properties are conservative (safe) for design. This study also provides one explanation why slope stability analyses using uncorrelated soil properties can predict unreasonably high probabilities of failure when conventional estimates of factor of safety suggest a stable slope.
10
Yin, Xiangjie, Hang Lin, Yifan Chen, Yixian Wang e Yanlin Zhao. "Precise evaluation method for the stability analysis of multi-scale slopes". SIMULATION 96, n.º 10 (3 de agosto de 2020): 841–48. http://dx.doi.org/10.1177/0037549720943274.
Texto completo da fonteResumo:
Slope stability analysis is a multi-scale problem. Typically, owing to the distinctions of slope scales (e.g., slope height or slope angle) in practical engineering, the stability calculation results of slopes with various scales from numerical methods inevitably exhibit different computational precision levels in the case of identical computational grids, and therefore the stability results of different slopes cannot be compared. To achieve equal accuracy stability analysis for multi-scale slopes, this study establishes numerical models of slopes with various scales as well as different grid shapes and sizes to conduct stability analysis. The results show the following: (a) a positive correlation relationship exists between the safety factor of the slope and the scaling factor, which is defined as the ratio of the grid size to the slope height; (b) the definition of the refined safety factor is given, representing the safety factor that corresponds to the infinitesimal grid size and eliminating the computational error of slope stability analysis caused by grid size or shape; (c) on this basis, embarking on the composite influence of multiple scales of slope on stability analysis, the study proposes a simplified treatment method suitable for evaluating the refined safety factor of the multi-scale slopes, which is verified as valid and feasible by some examples.
Teses / dissertações sobre o assunto "Positive slope"
1
Alloin, Eliott. "Etude numérique des instabilités hydrodynamiques dans le distributeur et l'avant-distributeur de turbines-pompes". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI025.
Texto completo da fonteResumo:
Pour améliorer la stabilité de réseau électrique et permettre une meilleure intégration des énergies renouvelables intermittentes, les Turbines-Pompes (TP) dans les Stations de Transfert d'Énergie par Pompage (STEP) sont utilisées plus loin de leur point de fonctionnement nominal en mode pompe. Une zone d'instabilité hydrodynamique limite le fonctionnement des TP en mode pompe pour la charge partielle (haute chute). Les performances d’une pompe en charge partielle restent cependant difficiles à prédire numériquement. Dans cette étude, des Simulations des Grandes Échelles (SGE ou LES) sont utilisées pour améliorer la prédiction de l'instabilité hydrodynamique survenant dans le cadre. Les simulations sont réalisées sur une géométrie complète de TP pour plusieurs points d'opération. Une approche Arbitraire Lagrangienne-Eulérienne (ALE) avec Adaptation Dynamique de Maillage (DMA) est utilisée pour prendre en compte la rotation de la roue. De plus une stratégie de convergence en maillage est utilisée et permet de garantir une bonne discrétisation du champ de vitesse moyenne et qu'une part suffisante de l'énergie turbulente est résolue. Une attention spécifique est donnée à la comparaison avec les résultats expérimentaux. Les simulations LES montrent des résultats similaires aux résultats d'essais réalisés par General Electric Hydro Solutions. Les décollements (tournants ou non) dans le cadre sont prédits à charge partielle par ces simulations. De plus, il est montré que ces décollements influencent l'écoulement dans la roue ce qui conduit à des lâchés tourbillonnaires proches des bords de fuite des pales. Ce phénomène génère des pertes et est responsable de la pente positive sur la courbe caractéristique de la pompe conduisant à un comportement instable de la machine. Des simulations SAS (Scale Adaptative Simulation) sont aussi réalisées sur la géométrie complète de TP. Ces dernières prédisent les mêmes pertes que les LES sauf dans la roue où elles manquent le phénomène de lâché tourbillonnaire au bord de fuite des aubes. D'autres simulations LES, sur une configuration simplifiée, permettent de mettre en valeur certains paramètres influençant les décollements dans le cadre. Ces travaux donnent ainsi un éclairage nouveau sur les instabilités hydrodynamique en charge partielleFor improved grid stability and better integration of intermittent renewable energies, Pump Turbines (PT) in Pump Storage Plants (PSP) are used in pump mode further away than their design point. In pump mode, the hump zone limits the operating range at part load (high head). The numerical prediction of the PT performances of this part-load instability is still challenging. In this study, Large Eddy Simulations (LES) are used to improve the prediction of the tandem cascade hump. Simulations on a full PT geometry are done for several operating points. An Arbitrary-Lagrangian-Eulerian (ALE) approach coupled with a Dynamic Mesh Adaptation (DMA) methodology is used to take into account the runner rotation. Moreover, a mesh convergence strategy is used to guarantee the accuracy of the mean field discretization, and to ensure the resolution of a sufficient part of the turbulent scales. Specific attention is paid to properly comparing simulations to experimental tests. Simulations results are in good agreement with experimental results obtained with platform tests made by General Electric Hydro Solutions. Part-load simulations predict (rotating or alternate) stalls in the tandem cascade. Moreover, it is shown that those stalls influence the flow in the runner where vortices, close to the trailing edges of the blades, are generated. This phenomenon generates losses and is responsible for the positive slope in the pump characteristic curve leading to unstable pump behavior. Scale Adaptative Simulations (SAS) are also used on the full PT geometry. The latter predict the same losses as LES except in the runner where they fail to predict the trailing edge vortices. Other LES simulations, on a simplified configuration, highlight parameters influencing tandem-cascade stalls. This study allows a new insight into part-load instability
2
Monika, Sadia K. "III- Nitride Enhancement Mode Device". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483535296785214.
Texto completo da fonte
3
Wang, Jinou [Verfasser]. "The Current Slope Based Position Estimation for Self-Sensing Magnetic Bearings / Jinou Wang". Aachen : Shaker, 2016. http://d-nb.info/1101184736/34.
Texto completo da fonte
4
McCombs, John Wayland II. "Geographic Information System Topographic Factor Maps for Wildlife Management". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36865.
Texto completo da fonteResumo:
A geographic information system (GIS) was used to create landform measurements and maps for elevation, slope, aspect, landform index, relative phenologic change, and slope position for 3 topographic quadrangles in Virginia. A set of known observation points of the Northern dusky flying squirrel (Glaucomys sabrinus) was used to build 3 models to delineate sites with landform characteristics equivalent to those known points. All models were built using squirrel observation points from 2 topographic quadrangles. The first model, called "exclusionary", excluded those pixels with landform characteristics different from the known squirrel pixels based on histogram analyses. Logistic regression was used to create the other 2 models. Each model resulted in an image of pixels considered equivalent to the known squirrel pixels. Each model excluded approximately 65% of the Highland study area, but the exclusionary model excluded the fewest known squirrel pixels (12.62%). Both logistic regression models excluded approximately 10% more known squirrel pixels than the exclusionary approach. The models were tested in the area of a third quadrangle with points known to be occupied by squirrels. After the model was applied to the third topographic quadrangle, the exclusionary model excluded the least amount of full-area pixels (79.30%) and only 14.81% of the known squirrel pixels. The second logistic regression excluded 81.16 % of the full area and no known squirrel pixels. All models proved useful in quickly delineating pixels equivalent to areas where wildlife were known to occur.Master of Science
5
Enger, Matthew. "IMPACTS OF CONCENTRATED FLOW PATHS ON CROP YIELDS AND WATER QUALITY IN SOUTHERN ILLINOIS ROW CROP AGRICULTURE". OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2380.
Texto completo da fonteResumo:
Sediment and nutrient loss from agricultural landscapes contributes to water quality impairment and has the potential to impact crop yield. Best management practices (BMPs) such as riparian buffers have been designed to combat these issues; however, concentrated flow paths (CFPs) reduce their effectiveness and are often overlooked in agricultural fields. Conventional management of CFPs is to fill and grade them, however this provides only a short term solution leading to their reformation and increased sediment loss. The objectives of this project were: i) to determine if the filling of CFPs influence crop growth (yield and biomass), ii) determine a distance at which crop growth is no longer influenced by CFPs, iii) assess the impact that topography and CFPs have on crop growth, iv) analyze water quality in surface runoff leaving crop fields via CFPs, and v) develop an economic analysis for CFP’s influence on crop returns. Six small agricultural catchments, CFPs, and topographic positions (i.e., depositional, backslope, and shoulder) were delineated using ArcGIS and LiDAR data. In each catchment, six 4 m2 plots were established along CFPs where crop biomass and crop yield were measured. Additionally, six plots with no influence from CFPs were established as reference plots. Surface water quality was assessed by taking edge-of-field grab samples at the CFP outlet during significant rain events (i.e., precipitation exceeding 2.5 cm). Water samples were analyzed for total suspended solids (TSS), total phosphorus (TP), dissolved reactive phosphorus (DRP), ammonium-nitrogen (NH4+-N), and nitrate-N (NO3- -N). Through this study it was shown that CFPs served as a conduit for transporting nutrient and sediment laden runoff to receiving waters, that increasing/decreasing distance from CFPs had an impact on crop yields, and that there was no crop yield advantage from the filling of CFPs vs. leaving them unfilled. Median values for NO3-N (1.85 mg L-1) and TSS (140 mg L-1) in the Fill catchments were higher than the No-Fill catchments (0.77 mg L-1 and 35.5 mg L-1, respectively), while DRP and TP concentrations were higher in the No-Fill catchments (1.31 mg L-1 and 2.37 mg L-1, respectively) compared to the Fill catchments (0.91 mg L-1 and 1.83 mg L-1, respectively) over the growing season. Crop biomass and yield results between the depositional and backslope positions were similar regardless of treatment, but were lower than the reference plots and shoulder position. Results from the economic analysis on the cost of farming in/near CFPs indicated that the economic return was greatly dependent on precipitation. CFPs are generally concave positions on the landscapes and have been eroded to a clayey subsoil, both resulting in greater water accumulation and retention than elsewhere in the field. During wetter years, an economic loss was incurred nearest to the CFP and during drier years, sites nearest to CFPs saw positive returns. Farmers and land managers may consider implementing stabilization measures, such as grassed waterways, in CFPs since crop yields are typically lower in wetter years, there’s increased cost to maintain these areas, and accelerated sediment loss can exacerbate the crop yield losses and impact on water quality.
6
Sandy, Alexis Emily. "Environmental and Digital Data Analysis of the National Wetlands Inventory (NWI) Landscape Position Classification System". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33572.
Texto completo da fonteResumo:
The National Wetlands Inventory (NWI) is the definitive source for wetland resources in the United States. The NWI production unit in Hadley, MA has begun to upgrade their digital map database, integrating descriptors for assessment of wetland functions. Updating is conducted manually and some automation is needed to increase production and efficiency. This study assigned landscape position descriptor codes to NWI wetland polygons and correlated polygon environmental properties with public domain terrain, soils, hydrology, and vegetation data within the Coastal Plain of Virginia. Environmental properties were applied to a non-metric multidimensional scaling technique to identify similarities within individual landscape positions based on wetland plant indicators, primary and secondary hydrology indicators, and field indicators of hydric soils. Individual NWI landscape position classes were linked to field-validated environmental properties. Measures provided by this analysis indicated that wetland plant occurrence and wetland plant status obtained a stress value of 0.136 (Kruskalâ s stress measure = poor), which is a poor indicator when determining correlation among wetland environmental properties. This is due principally to the highly-variable plant distribution and wetland plant status found among the field-validated sites. Primary and secondary hydrology indicators obtained a stress rating of 0.097 (Kruskalâ s stress measure = good) for correlation. The hydrology indicators measured in this analysis had a high level of correlation with all NWI landscape position classes due the common occurrence of at least one primary hydrology indicator in all field validated wetlands. The secondary indicators had an increased accuracy in landscape position discrimination over the primary indicators because they were less ubiquitous. Hydric soil characteristics listed in the 1987 Manual and NTCHS field indicators of hydric soils proved to be a relatively poor indicator, based on Kruskalâ s stress measure of 0.117, for contrasting landscape position classes because the same values occurred across all classes.
The six NWI fieldâ validated landscape position classes used in this study were then further applied in a public domain digital data analysis. Mean pixel attribute values extracted from the 180 field-validated wetlands were analyzed using cluster analysis. The percent hydric soil component displayed the greatest variance when compared to elevation and slope curvature, streamflow and waterbody, Cowardin classification, and wetland vegetation type. Limitations of the soil survey data included: variable date of acquisition, small scale compared to wetland size, and variable quality. Flow had limitations related to its linear attributes, therefore is often found insignificant when evaluating pixel values that are mean of selected pixels across of wetland landscape position polygons. NLCD data limitations included poor quality resolution (large pixel size) and variable classification of cover types. The three sources of information that would improve wetland mapping and modeling the subtle changes in elevation and slope curvature that characterize wetland landscapes are: recent high resolution leaf-off aerial photography, high-quality soil survey data, and high-resolution elevation data.
Due to the data limitations and the choice of variables used in this study, development of models and rules that clearly separate the six different landscape positions was not possible, and thus automation of coding could not be attempted.Master of Science
7
Brett, Bob, Karel Klinka, H. Qian e Christine Chourmouzis. "Classification of high-elevation, non-forested plant communities in coastal British Columbia. Full report". Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/719.
Texto completo da fonteResumo:
This report expands and clarifies previous classifications of non-forested plant communities from upper subalpine and alpine locations in coastal British Columbia. A total of 80 plots (releves) sampled specifically for this study were added to 202 releves from published and unpublished studies conducted since 1963. We used tabular and multivariate methods to synthesize and classify plant communities according to the Braun-Blanquet approach. Plant communities were classified into 37 vegetation units (associations or subassociations) which served as the basis of the resulting hierarchical classification. We describe the habitat and species composition of these vegetation units and their relationship to units recogized elsewhere in the Pacific Northwest. We then present eight generalized habitat types which we propose as the basic units for future ecosystem mapping. Each of these habitat types includes a predictable mosaic of vegetation units whose pattern occurs at too fine a scale to map individually.
8
Klinka, Karel, Christine Chourmouzis, Bob Brett e H. Qian. "Classification of high-elevation, non-forested plant communities in coastal British Columbia". Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/710.
Texto completo da fonteResumo:
Non-forested ecosystems dominate high elevation sites in coastal British Columbia, yet there has never been a comprehensive classification or mapping of all high-elevation community types. The objective of this study is to collate and expand upon previous classifications, and thereby to increase our understanding of the habitats and composition of these plant communities.
9
Alves, Ronaldo Fernandes Santos. "Desigualdade socioeconômica e obesidade abdominal: uma apreciação crítica e pragmática em epidemiologia". Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8505.
Texto completo da fonteResumo:
Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorFundação de Amparo à Pesquisa do Estado do Rio de Janeiro
Esta dissertação buscou uma apreciação crítica e pragmática da relação entre desigualdade socioeconômica e obesidade abdominal, em resposta a proposição internacional de monitoramento das desigualdades em saúde e a escassez de estudos desta natureza relativos à obesidade abdominal. Dois artigos foram elaborados a fim de estimar o grau de desigualdade educacional na ocorrência de obesidade abdominal e revisar os estudos de associação entre posição socioeconômica e obesidade abdominal. O primeiro artigo utilizou o índice angular de desigualdade e o índice relativo de desigualdade em dados seccionais de 3.117 participantes da linha de base do Estudo Pró-Saúde, 1999-2001, e o segundo artigo abarcou os resultados de estudos conduzidos em população adulta no Brasil. Os índices de desigualdade resumiram a tendência monotônica e inversa observada entre escolaridade e obesidade abdominal na população feminina, proporcionando estimativas quantitativas desta desigualdade (artigo 1). Em concordância, observou-se que a associação entre indicadores de posição socioeconômica e obesidade abdominal foi majoritariamente inversa entre as mulheres, principalmente com relação à escolaridade, e estatisticamente não significativa entre os homens (artigo 2). Tal cenário epidemiológico evidencia que a obesidade abdominal tem afetado desproporcionalmente as mulheres de posição socioeconômica mais baixa e que a desigualdade de gênero na prevalência de obesidade abdominal tende a aumentar com menor posição socioeconômica. Em suma, a presente dissertação visou à produção de conhecimento epidemiológico relevante ao enfrentamento das desigualdades em saúde, com o objetivo premente de subsidiar políticas públicas de fato realizáveis e individualmente aceitáveis.
This dissertation sought to a critical and pragmatic assessment of the relationship between socioeconomic inequality and abdominal obesity in response to international proposition of health inequalities monitoring and to lack of studies of this nature relating to abdominal obesity. Two articles were prepared to -estimate the level of educational inequality in the occurrence of abdominal obesity, and review the association studies between socioeconomic position and abdominal obesity. The first article used the slope index of inequality and the relative index of inequality in the sectional data of 3.117 participants in the baseline of the Pró-Saúde Study, 1999-2001; and the second article encompassed the results of the studies conducted in the adult population in Brazil. The inequality indexes summarized strictly monotonic and inverse trend between educational achievement and abdominal obesity in the female population, providing quantitative estimates of this inequality (Article 1). Accordingly, we found that the association between socioeconomic position indicators and abdominal obesity was mostly reversed among women, especially regarding education, and statistically not significant among men (Article 2). This epidemiological scenario shows that abdominal obesity has disproportionately affected women of the lower socioeconomic position, and gender inequality in the prevalence of abdominal obesity tends to increase with lower socioeconomic position. In short, this dissertation aimed at the production of relevant epidemiological knowledge to addressing health inequalities, with the targeted of subsidize public policies feasible and individually acceptable.
10
Van, Noord Kenrick A. A. "Deep-marine sedimentation and volcanism in the Silverwood Group, New England Fold Belt, Australia". Thesis, Queensland University of Technology, 1999.
Encontre o texto completo da fonteResumo:
In eastern Australia, the New England Fold Belt (NEFB) comprises an ancient convergent margin that was active from the Paleozoic until the late Mesozoic. Considerable effort has been expended in understanding the development of this margin over the past twenty years. However, proposed tectonic models for the orogen have either been too broad, ignoring contradictory local evidence, or too locally specific without paying attention to the 'big picture'. The research presented in this work addresses the issue of appropriate scale and depth of geological detail by studying the NEFB at the terrane-scale. Using one succession, the Silverwood Group of southeast Queensland, this work demonstrates that detailed sedimentological studies and basin analysis at the terrane-scale can help to refine hypotheses regarding the tectonic evolution of the NEFB.
The Silverwood Group (Keinjan terrane), located approximately 140 km southwest of Brisbane, Australia, is a succession of arc-related basins that developed within an ancient intraoceanic island-arc during the mid-Cambrian to Late Devonian. From the base of the succession, the group consists of five formations totalling -9700 m. These include the Risdon Stud Formation (2500 m), Connolly Volcanics (2400 m), Bald Hill Formation (2450 m), Ormoral Volcanics (600 m) and the Bromley Hills Formation (1700 m). The Long Mountain Breccia Member (300m) is a separate unit which forms the lower part of the Bromley Hills Formation. The entire succession has been thrust west over the Late Devonian to Early Carboniferous Texas beds. Elsewhere, the Silverwood Group is unconformably overlain by and faulted against Early to Late Permian units including the Rokeby beds, Wallaby beds, Tunnel beds, Fitz Creek beds, Eight Mile Creek beds, Rhyolite Range beds and Condamine beds. Of these Permian units, all but the Condamine beds form part of the Wildash Succession. To the west, southwest and south, the Silverwood Group is intruded by the Late Triassic Herries and Stanthorpe Adamellites. All of these sequences and the two plutonic intrusives are unconformably overlain by the Jurassic sediments of the Marburg Sandstone.
The Silverwood Group and Texas beds consist of various lithologies including grey, purple- grey, green and green-grey volcaniclastic conglomerates, sandstones, siltstones or mudstones, massive and laminated chert, polymict or monomict breccias, muddy breccias, muddy sandstones, and volcanic rocks. Volcanic rocks include various tholeiitic metabasites, dolerite, meta-andesites and infrequent metadacite. In the Silverwood Group, these volcanic rocks are often accompanied by mafic pyroclastic rocks (e.g. peperite and hyaloclastite). Facies analyses of these lithologies has led to the recognition of 19 deep-marine turbiditic and volcanic/volcaniclastic facies that were deposited by three main processes: i) gravity-flow processes (e.g. low- and high-density volcaniclastic turbidites and mass-flows), ii) chemical/biological processes (siliceous oozes- chert) and iii) direct initiation by volcanic processes (e.g. flows, hypabyssal intrusions and associated pyroclastic facies).
For the Silverwood Group, the defined facies occur in distinct vertical associations that form recognisable 3rd and 4th-order architectural elements such as channel, levee, suprafan lobe, outer-fan, basin plain, mass transport complex, volcanic flows, syn-sedimentary sills and syn-sedimentary emergent cryptodomes. These architectural elements are represented in a series of deep-marine depositional environments including slope, shelf-edge failure, submarine-fan and subaqueous basaltic volcanoes. The Risdon Stud Formation and parts of the Connolly Volcanics were deposited along a 'normal' clastic or mud, mud/sand-rich and/or sand/mud-rich slope. Both upper and lower slope environments are represented and in both formations, the slope is speculated to have faced eastwards and prograded away from an active arc located west. Sediments from both successions accumulated at palaeodepths of 1200 to 2000 m.
Although sediments from the upper part of the Bald Hill Formation were also deposited on a slope, these sequences have subsequently collapsed into the depocentre to form extensive slump deposits accompanied by olistoliths of older arc crust. The lower part of the Bald Hill Formation formed by similar processes, although the failure was far more extensive (>20 km along strike). This latter part of the formation is interpreted to be a major shelf-edge failure succession. Upper parts of the Bald Hill Formation also accumulated at palaeodepths of 1200 to 2000 m, but the deposition of these sediments occurred farthest from the shelf and at the greatest depth compared to the Risdon Stud Formation and Connolly Volcanics. Lower parts of the Bald Hill Formation were deposited at palaeodepths of approximately 1700 m.
Subaqueous basaltic volcanoes are prominent in the Connolly Volcanics, Bald Hill Formation and Ormoral Volcanics. In the Bald Hill Formation, igneous rocks were emplaced into the shelf-edge failure succession as a series of syn-sedimentary sills and cryptodomes. These high-level hypabyssal rocks occasionally became emergent above the sediment-water interface, whereupon they were partially resedimented. In some parts of the Bald Hill Formation, the hypabyssal intrusions were blanketed by basin plain deposits that are contemporaneous with the slumps and olistoliths in the upper part of the formation. The intrusive rocks were emplaced at 1700 m palaeodepth.
Unlike the Bald Hill Formation, the Ormoral Volcanics and lower parts of the Connolly Volcanics form thick accumulations of extrusive volcanic and pyroclastic rocks that built a significant volcanic pile. Volcanic and pyroclastic facies within these successions were deposited proximal to their source (0-10 km of vent). Extrusive rocks within the Ormoral Volcanics are thought to be derived from intrabasinal fissure-vents located at palaeodepths of 1700 to 3100 m. Igneous rocks from the Connolly Volcanics, Bald Hill Formation and Ormoral Volcanics have the petrological and geochemical characteristics of back-arc basin basalts (BAB) that were sourced from undepleted to slightly enriched Fertile MORB Mantle-wedge (FMM). The FMM material was variably enriched in trace elements by fluids derived from the subducting slab prior to emplacement of the igneous rocks. Immediately following emplacement, these rocks were hydrothermally metamorphosed under conditions of low-pressure and transitional low to high-temperature (200-300 °C). By contrast, igneous rocks within the Texas beds lack enrichment in subduction components and are characteristic of N-MORB.
The Bromley Hills Formation is a sand-rich point-source submarine fan deposited at palaeodepths of 500 to 2000 m. The fan was initiated by a mass transport complex resulting from subaerial collapse of a basaltic-andesitic stratovolcano. The submarine fan is characterised by two repetitive stages of retrogressive sedimentation during which channel-levee elements (inner-fan channels) are overlain by suprafan lobe elements (mid-fan) and then by outer-fan deposits as sea-level rises within the depocentre. Both inner-fan channels and suprafan lobes show centralised stacking patterns with limited lateral migration that indicate the depocentre was laterally restricted during sedimentation (e.g. submarine ridges). The Bromley Hills Formation exhibits all the characteristics typical of an active margin fan that formed by a combination of tectonic stage initiation followed by eustatically controlled regressive deposition.
Volcaniclastic sediments of the Silverwood Group range in composition from lithic to lithic- feldspathic wackes and arenites, although they are mainly lithic or feldspathic-lithic wackes and arenites. Many samples are tuffaceous (25-75% pyroclasts), particularly those from the Connolly Volcanics, Ormoral Volcanics and Bromley Hills Formation. Samples in the Bald Hills Formation and Texas beds can be classified as quartz-rich. The majority of the Silverwood Group was sourced from an undissected intraoceanic island-arc, although sediments within the Bald Hill Formation exhibit a provenance that is characteristic of uplift within the arc (recorded as a 'strike-slip continental arc' model). Epiclastic sediments from the Texas beds were sourced from a transitional to dissected continental arc.
Formations of the Silverwood Group were mostly deposited in a series of intra-arc basins within an ancient intra-oceanic island arc, although the lowermost formation developed in a marginal basin (Risdon Stud Formation). All of the basins were located east of the active arc (behind the arc), keeping in mind the present location of the Group relative to the Texas-Coffs Harbour megafold. The entire succession formed during four-phases of arc-related basin development that coincide with major changes in the strain regime of the arc. From the base of the succession, these changes are: I) mid Cambrian to late Silurian marginal basin sedimentation- relative compression within the arc (Risdon Stud Formation), II) late Silurian to Early Devonian intra-arc rifting- relative extension within the arc (Connolly Volcanics), Ill) Early to early Middle Devonian basin collapse followed by intra-arc rifting- relative extension to compression (Bald Hill Formation and Ormoral Volcanics) and IV) early Middle to Late Devonian intra-arc submarine fan sedimentation- relative compression (Bromley Hills Formation).
Comparing the Silverwood Group against equivalent terranes of Cambrian to Devonian age within the New England Fold Belt (NEFB) suggests that the Gamilaroi terrane, Calliope Volcanic Assemblage, Willowie Creek beds and Silverwood Group all formed as one intraoceanic island-arc during the Early to Late Devonian. Prior to this, significant differences in the sedimentological evolution of these terranes suggests that they occupied different positions relative to each other within the one arc. It is proposed that the NEFB formed as a result of dual west-directed subduction zones during the Cambrian to Middle Devonian period. During this time, a single intraoceanic island-arc located seaward of the Australian craton developed above a west-directed subduction zone. This arc was separated from the craton by a marginal sea. A second west-directed subduction zone was located beneath a continental arc developed on the Australian craton. Cambrian to Early Devonian terranes within and along the Peel Fault are proposed to form a part of the ancient subduction zone present beneath the intraoceanic island-arc (Weraerai and Djungati terranes). Collision of the intraoceanic island-arc occurred during the Late Devonian, at which point west-directed subduction occurred beneath the Australian craton and the accreted intraoceanic island-arc. Following collision, a new continental volcanic arc was established that was active during the Late Devonian to Early Carboniferous.
Livros sobre o assunto "Positive slope"
1
S, Preisser John, e United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Location of noise sources using a phase-slope method. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.
Encontre o texto completo da fonte
2
Mallawatantri, Ananda P. Effects of long-term management, slope position and depth on pesticide transport parameters. 1990.
Encontre o texto completo da fonte
3
Rodman, Ann Winne. The effect of slope position, aspect, and cultivation on organic carbon distribution in the Palouse. 1988.
Encontre o texto completo da fonte
4
Huyck, Leisa M. Effects of slope position, season, and long-term management on aggregate stability in an organically and conventionally farmed Naff silt loam. 1989.
Encontre o texto completo da fonte
5
Maxwell, Christopher I. Lead Like a Guide. ABC-CLIO, LLC, 2016. http://dx.doi.org/10.5040/9798400677526.
Texto completo da fonteResumo:
Discover the leadership strengths of world-class mountain guides and see how developing and applying these principles can help you reach for the highest summits in work–and in life. This intriguing approach to business and personal success introduces six leadership strengths of world-class mountain guides: demonstrating social intelligence; adopting a flexible leadership style; empowering others; facilitating the development of trust; managing risk in an environment of uncertainty; and seeing the big picture. The premise is that these same strengths provide a valuable model in the workplace and other networks, whether one is already in a leadership position or aspiring to get there. The result of more than a decade of research combined with the author's personal experience, the book explains how mountain guides coach people to reach for their highest goals in the most challenging environments, often enabling them to far exceed what they imagined possible. The same principles can be applied in business and elsewhere. To set readers on the right path, the author explains six strengths of guides, incorporating interviews and quotes from guides and expedition participants to illustrate leadership lessons and show how they can be successfully used off the slopes. The book also provides a checklist of action steps readers can follow to foster skill development.
6
Sumner, L. W. Physician-Assisted Death. Oxford University Press, 2017. http://dx.doi.org/10.1093/wentk/9780190490188.001.0001.
Texto completo da fonteResumo:
The issue of physician-assisted death is now firmly on the American public agenda. Already legal in five states, it is the subject of intense public opinion battles across the country. Driven by an increasingly aging population, and a baby boom generation just starting to enter its senior years, the issue is not going to go away anytime soon. In Physician-Assited Death L.W. Sumner equips readers with everything they need to know to take a reasoned and informed position in this important debate. The book provides needed context for the debate by situating physician-assisted death within the wider framework of end-of-life care and explaining why the movement to legalize it now enjoys such strong public support. It also reviews that movement's successes to date, beginning in Oregon in 1994 and now extending to eleven jurisdictions across three continents. Like abortion, physician-assisted death is ethically controversial and the subject of passionately held opinions. The central chapters of the book review the main arguments utilized by both sides of the controversy: on the one hand, appeals to patient autonomy and the relief of suffering, on the other the claim that taking active steps to hasten death inevitably violates the sanctity of life. The book then explores both the case in favor of legalization and the case against, focusing in the latter instance on the risk of abuse and the possibility of slippery slopes. In this context the experience of jurisdictions that have already taken the step of legalization is carefully reviewed to see what lessons might be extracted from it. It then identifies some further issues that lie beyond the boundaries of the current debate but will have to be faced sometime down the road: euthanasia for patients who are permanently unconscious or have become seriously demented and for severely compromised newborns. The book concludes by considering the various possible routes to legalization, both political and judicial. Readers will then be prepared to decide for themselves just where they stand when they confront the issue both in their own jurisdiction and in their own lives.
Capítulos de livros sobre o assunto "Positive slope"
1
Braga, V. B. M., J. C. S. Zapico, V. Tyagi e R. Bono. "Challenges experienced during simultaneous backfill grouting using single shield large diameter TBM driven in a sharp negative slope". In Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World, 1175–82. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003348030-139.
Texto completo da fonte
2
Li, Niu, e Junxi Feng. "Cold Seepage in the Southern South China Sea". In South China Sea Seeps, 225–34. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1494-4_13.
Texto completo da fonteResumo:
AbstractExtensive submarine cold seep areas, i.e., the Beikang Basin and the Nansha Trough, were discovered on the southern continental slope of the South China Sea. Bottom-simulating reflections are widespread in these areas and show a close relationship to the cold seep system. High-resolution 2-D seismic data and multibeam bathymetry data have confirmed the existence of deep-routed conduits−mud volcanoes, diapirs, and gas chimneys. The geochemical characteristics of seep carbonates and headspace gas indicate that the fluid was mainly sourced from biogenic gas, with contributions from deep-rooted thermogenic gases. Additionally, negative pore water chloride anomalies and positive δ18O values (3.7‰ < δ18O < 5.0‰) of the seep carbonates provided indicators of hydrate water addition during carbonate precipitation. The negative δ13C excursion of planktonic foraminifera from the Nansha Trough indicated two methane release events, which occurred approximately 29–32 ka and 38–42 ka before present, and the driving mechanism for methane seepage in this area is possibly related to overpressure from the large sediment accumulation that occurred during sea level lowstands.
3
Capparelli, Giovanna, Serena Artese, Andrea Carri, Margherita Lombardo, Andrea Segalini, Alessandro Valletta e Francesco Muto. "The Integrated Landslides Monitoring System of Gimigliano Municipality, Southern Italy". In Progress in Landslide Research and Technology, Volume 3 Issue 1, 2024, 341–52. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55120-8_24.
Texto completo da fonteResumo:
AbstractMonitoring the stability of a slope is one of the non-structural measures aimed at reducing the risk of landslides. Displacement detection is now possible through numerous monitoring techniques, including remote sensing and ground-based solutions. In particular, in-situ monitoring allows some advantages related to using low-cost instruments whose communication can be facilitated by IoT technologies. In this chapter, we illustrate an example of an intelligent system for the integrated monitoring of the main landslide bodies of Gimigliano (CZ), southern Italy.The station includes clusters for monitoring deep movements and piezometric levels, as well as for urban structures through specific sensors and a network of sensors for topographic surface monitoring. The system was designed to be almost fully automatic and oriented to support near real-time warning activities. The data recorded by the deep and surface monitoring instruments confirm that the study area is affected by complex phenomena requiring long-term on-site monitoring.Specifically, analysis of the deep movements revealed some critical events during spring 2022 and summer 2023 that resulted in positive and negative millimetric deformations, measured by the tilt meters installed in correspondence with the monitored sites. Surface topographic analysis indicates displacement rates of 2.5–5 cm/year.
4
Hajiazizi, M., e F. Heydari. "Best Position of Pile in Earth Slope". In Proceedings of AICCE'19, 579–85. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32816-0_40.
Texto completo da fonte
5
Shirima, Kelvine C., e Claude G. Mung'ong'o. "Agroecosystems' resilience and social-ecological vulnerability index to climate change in Kilimanjaro, Tanzania." In Climate change impacts and sustainability: ecosystems of Tanzania, 34–43. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781789242966.0034.
Texto completo da fonteResumo:
Abstract The concept of resilience has gained momentum during the current climate change era. Resilience is said to be the measure of the amount of change the system can undergo while still retaining the same controls on function and structure. Taking into account the effects of changing climate, the term resilience has been used to assess the vulnerability of social-ecological systems. Most agroecosystem studies have focused on dryland ecosystems and this prompted the need to shift concern on to mountainous ecosystems whose susceptibility to climate change is not adequately addressed. This chapter assesses the resilience of maize-coffee-banana agroecosystems on the southern slope of Mount Kilimanjaro in Tanzania. Also, it assesses agronomic practices and the social-economic status of farmers and computes a social-ecological vulnerability index for the ecosystem. The study depicts variation of agronomic practices with altitude due to microclimatic differences, terrain and soil characteristics that determine the type of crops and their farming system which have both positive and negative implications. Climatic shocks (e.g. drought frequency, floods and below average rains) were found to have an impact on agricultural yield. Social-economic indicators (e.g. the number of household dependants, social safety nets, off-farm contribution, possession of land title, usage of wood for cooking energy and access to extension services) have also shown a significant influence on household vulnerability to changing climate which may later affect the agroecosystem productivity as these parameters are associated with the natural environment. Indicators chosen for the vulnerability index depict slight variations of vulnerability altitude wise, except for the mid-lower zone which appears to be more vulnerable.
6
Christyan, Timothy, Tasmi, Darra Funna, Muhammad Raidhy Mustafid e Muhammad Zaki Almuzakki. "Improved False Position Method Based on Slope (IFPMS)". In Intelligent Systems of Computing and Informatics, 192–211. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003400387-13.
Texto completo da fonte
7
Weltzin, Jake F., e Philip B. Allen. "Tree Seedling Recruitment in a Temperate Deciduous Forest: Interactive Effects of Soil Moisture, Light, and Slope Position". In Ecological Studies, 217–26. New York, NY: Springer New York, 2003. http://dx.doi.org/10.1007/978-1-4613-0021-2_13.
Texto completo da fonte
8
McIvor, I. R., G. B. Douglas e R. Benavides. "Coarse root growth of Veronese poplar trees varies with position on an erodible slope in New Zealand". In Advances in Agroforestry, 251–64. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3323-9_19.
Texto completo da fonte
9
Floris, Antonio, e Lucio Di Cosmo. "Protective Function and Primary Designated Management Objective". In Springer Tracts in Civil Engineering, 469–502. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98678-0_11.
Texto completo da fonteResumo:
AbstractIn a framework of multiple services supplied simultaneously by forests, the protection against natural hazards is one of the most important. Forests deliver conservation of natural resources, including soil and water, and other environmental services. They slow water dispersion and allow for infiltration and percolation of rainwater, which recharges soil and underground water storage. Forest cover, moreover, protects soil from wind and water erosion, avalanches and landslides. INFC collects a wide range of information related to the protective function of Italian wooded areas. This chapter shows estimates regarding such physical site characteristics, as slope, land position and aspect which, together with tree canopy coverage and terrain roughness, can condition the protective role of forests. Inventory statistics on terrain instability and hydrogeological constraint, as defined by national laws, are shown as well, the latter being a basis of most national and regional regulations on forest management. Finally, the presence of a primary designated management objective has been assessed with a particular focus on direct and indirect protection. Estimates on such attributes are shown in the last section of this chapter.
10
Dabir, Ashok, e Jayesh Vahanwala. "Orthognathic Surgery for the Maxilla-LeFort I and Anterior Maxillary Osteotomy". In Oral and Maxillofacial Surgery for the Clinician, 1513–48. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-1346-6_69.
Texto completo da fonteResumo:
AbstractThe chapter reviews the history and technique of maxillary orthognathic surgical procedures and highlights the sequence of bimaxillary surgery. A maxillary surgical procedure and its modification can be employed to correct skeletal deformities of the maxilla. With presently available surgical techniques, the maxilla may be independently repositioned in three dimensions. Segmentalization of the maxilla in turn allows repositioning different portions in different three dimensional planes, when done under direct vision. The changes in the position of the maxilla also causes soft tissue changes of the lips, cheeks, and nose. Changes in the nasal complex after orthognathic surgery, with the exception of nasal width, are complicated, and cannot be predicted. Having listed a general guide, the authors reiterate that no dogma should be given regarding the sequence of maxillary or mandibular surgery. Any surgical decision must be made after in-depth planning, preparation, and flexibility. If this is done, sequencing will follow logically.The chapter also includes key considerations in orthognathic surgery viz., adjustment to the base of the Nose and ANS; effect of changing the inclination (slope) of the osteotomy cut; impacted / erupted wisdom teeth; preoperative/intraoperative difficulties and proper positioning. An in-depth account of nutritional support and dealing with complications rounds off the discussion.
Trabalhos de conferências sobre o assunto "Positive slope"
1
Yau, Y. T., K. I. Hwu e W. Z. Jiang. "One-comparator sampling based on positive-slope and negative-slope saw-toothed waves". In IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2015. http://dx.doi.org/10.1109/iecon.2015.7392092.
Texto completo da fonte
2
Ibrir, Salim. "Circle-criterion observers for dynamical systems with positive and non-positive slope nonlinearities". In 2007 American Control Conference. IEEE, 2007. http://dx.doi.org/10.1109/acc.2007.4283110.
Texto completo da fonte
3
Ran, Hongjuan, Xianwu Luo, Yao Zhang, Baotang Zhuang e Hongyuan Xu. "Numerical Simulation of the Unsteady Flow in a High-Head Pump Turbine and the Runner Improvement". In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55045.
Texto completo da fonteResumo:
The unsteady flow in a high-head pump-turbine whose head-discharge curve has the positive slopes at high-partial-load operation condition was investigated. It is noted that the numerical methods is very important for predicting this kind of head-discharge curve with positive slopes, and better agreement between calculation results and experimental data was achieved by using Spalart-Allmaras turbulence model and mesh strategy with y+ controlling for numerical simulation. From the analysis of hydraulic losses at different parts in the pump turbine, it is found that the head loss at the flow passage of the guide vane and stay vane was not small at pump mode. In order to make clear the reason why the positive slopes at head-discharge curve occur, the flow between the impeller exit and the inlet of spiral casing was checked carefully. Much intensive vortex was observed near the impeller shroud, and there was strong rotor stator interaction for those operation conditions with positive slope. It is suspected the instability such as positive slope at head-discharge curve was resulted from the vortex formation near the flow channel wall. Based on the flow analysis, the runner optimization was conducted so as to mitigate the intensive rotor stator interaction. It is noted that the pressure fluctuation as well as the flow pattern was improved by applying the optimized impeller.
4
Guo, Zhi-Wei, Jing-Ye Pan e Zhong-Dong Qian. "The Effects of the Inlet Guide Vanes on an Axial Pump Under Off Design Points". In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83071.
Texto completo da fonteResumo:
The performances of an axial pump with and without inlet guide vanes (IGVs) are investigated by both experimental method and computational fluid dynamics (CFD) method. Besides the stall inception, an obvious “positive slope” phenomenon appears under off-design operating points in experiment without IGVs. The experimental data also shows that IGVs can change the performance of axial pumps and remove the “positive slope”. The CFD is mainly used to reveal the mechanism of the “positive slope” phenomenon, where the simulated results are firstly validated in comparison with the experimental data. The results obtained show that the reason for this “positive slope” is due to the backflow vortex in front of the impeller, and the tip clearance is found to take an important role in forming this backflow vortex.
5
Liu, Zhanyuan, Tamer Moussa e Hassan Dehghanpour. "Flowback Pattern-Recognition to Distinguish Between Formation and Fracturing Water Recovery". In SPE Canadian Energy Technology Conference. SPE, 2022. http://dx.doi.org/10.2118/208959-ms.
Texto completo da fonteResumo:
Abstract We analyze flowback production data of 502 multi-fractured horizontal oil and gas wells completed in the Montney Formation and 83 oil wells completed in the Duvernay and Horn River Formations. The main goal of this paper is to evaluate the possibility of distinguishing between formation and fracturing water based on the water-flowback response. We hypothesize that: 1) the slope of water-flowback harmonic decline (HD) profile is reversely proportional to formation water mobility, 2) the deviations from the unit slope on rate-normalized pressure (RNP) plots is proportional to the slope of HD, and 3) the slope of water-flowback HD correlates with the initial water saturation (Swi). To verify our hypothesis, we 1) classify the observed HD trends of water-flowback rate based on slopes, 2) construct RNP diagnostic plots of the studied wells, 3) analyze log data and estimate average Swi by using Archie equation (1952) for the studied wells. 4) investigate the effects of Swi on the water-flowback pattern. The results show that there are two distinct flowback patterns. The first flowback pattern shows sharp slope (>10-41/day) of water-flowback HD profile and relatively high slope values (0.64 to 0.984 kpa/m3) of the corresponding RNP plots. However, the second pattern shows very low slope of HD (<5 × 10-5 1/day), with some wells showing no significant decline of water rate through the entire flowback process, also relatively low slope values (0 to 0.23) of the corresponding RNP plots. Analysis of the log data shows a positive correlation between Swi and slope of water-flowback HD profile. We also found that the slopes are proportional to the slope of RNP. These results indicate that as Swi increases, slope of HD decreases and there is more deviation from the unit-slope on the RNP plots.
6
Li, Fayuan, e Guoan Tang. "Slope spectrum of positive and negative terrains on northern Shaanxi loess plateau". In 2010 International Conference on Audio, Language and Image Processing (ICALIP). IEEE, 2010. http://dx.doi.org/10.1109/icalip.2010.5684390.
Texto completo da fonte
7
Hoover, Carl D., e Kevin B. Fite. "Development of a Powered-Knee Transfemoral Prosthesis Prototype". In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53305.
Texto completo da fonteResumo:
Commercial prosthetic limb development for transfemoral amputees has historically focused on legged locomotive function with energetically dissipative or conservative limbs. While such passive devices are effective at approximating the mechanics of the knee during level walking and stair/slope descent, the inability of these limbs to impose net positive power prevents amputees from executing a number of activities of daily living. Activities such as ascending slopes, ascending stairs, and jumping require net positive power outputs that are not fully realizable with current prosthetic leg technology [1–3]. While functionality has improved with microprocessor-based passive limbs [4], amputees continue to exhibit increased metabolic demands and non-anthropomorphic asymmetric gait [5].
8
Abdullatif, Mahmoud, e Ranjan Mukherjee. "Effect of Intermediate Support on Instabilities of a Cantilever With Terminal Dynamic Moment". In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97204.
Texto completo da fonteResumo:
Abstract The stability characteristics of a cantilever beam, with and without an intermediate support, subjected to a dynamic terminal moment, is investigated. The moment is assumed to be proportional to the slope of a point along the length of the beam. The proportionally constant, which can be positive or negative, is varied to find the critical stability point. In the absence of intermediate support, stability is lost through divergence when the dynamic moment is proportional to the positive slope, and through flutter when the dynamic moment is proportional to the negative slope. In contrast, the nature of instability switches between divergence and flutter, and between different flutter instability modes while undergoing flutter, in the presence of an intermediate support.
9
Nishioka, Takahiro, Shuuji Kuroda e Tadashi Kozu. "Influence of Rotor Stagger Angle on Rotating Stall Inception in an Axial-Flow Fan". In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38259.
Texto completo da fonteResumo:
Inception patterns of rotating stall in a low-speed axial flow fan have been investigated experimentally. Experiments have been carried out at two different stagger angle settings for rotor blades. Pressure and velocity fluctuations were measured to elucidate the features of the stall cells and the stall inception patterns. At the design stagger angle setting for the rotor blades, a short length-scale stall cell known as a “spike” and multiple short length-scale stall cells appear when the slope of pressure-rise characteristic is almost zero. These stall cells grow into a long length-scale stall cell as flow rate decreases. The spike and the multiple short length-scale stall cells do not make the slope of the characteristic positive. However, the long length-scale stall cell induces a full-span stall, and makes the slope of the characteristic positive. At the small stagger angle, a long length-scale disturbance known as a “modal oscillation” is observed first, when the slope of the characteristic is positive. Then the spikes appear together with the modal oscillation as flow rate decreases. The long length-scale stall cell is generated by the spikes without change in the size of the modal oscillation. Suction-tip corner stall occurs in the stator passage near the peak of the characteristic at both the design and the small stagger angle settings. At the design stagger angle, however, the corner stall does not induce the modal oscillation and does not make the characteristic positive. In contrast, the corner stall at the small stagger angle induces the modal oscillation and makes the characteristic positive because it is larger than that at the design stagger angle. It is concluded from these results that the rotating stall inception patterns depend on the rotor stagger angle, which influences blade loading and rotor-stator matching.
10
Hagiya, Isao, Chisachi Kato, Yoshinobu Yamade, Takahide Nagahara e Masashi Fukaya. "Clarification of Performance Curve Instability Mechanism Using Large Eddy Simulation of Internal Flow of a Mixed-Flow Pump". In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-33438.
Texto completo da fonteResumo:
We analyzed the internal flows of a test mixed-flow pump exhibiting performance curve instability at low flow rates by using LES to clarify the performance curve instability mechanism. The LES was conducted using the open source software FrontFlow/blue [1]. In particular, we investigated in detail the flows at the flow rates, where the head curve had a positive slope under low flow rate condition. We clarified that Euler’s head drop caused by a stall near the tip of the rotor-blades is a dominant factor at the instability of the test pump. At the bottom point of the positive slope of the head curve, stall regions covered all the rotor-blade passages on the tip side. The drop of the angular momentum in the impeller caused by the stall on the leading edge side exceeds the increment caused by the decrease in the flow rate on the trailing edge at the bottom point of the positive slope. At the middle point of the positive slope of the head curve we also found regions with low-velocities in some blade passages. Such regions, namely stall cells, rotated around the impeller for one revolution while the impeller rotated almost about 20 revolutions in the direction opposite to the impeller’s rotation. The region with low-velocity first appears at the trailing edge and expands toward the leading edge. The angle of attack of the neighbouring blade in the direction opposite to the rotation of the blade increases and that blade pitch begins to stall. When that blade pitch is fully stalled, it is no longer loaded and the positive pressure gradient in that blade pitch decreases. The blade pitch is most likely to accept the excess flow. It recovers from the stalled state.
Relatórios de organizações sobre o assunto "Positive slope"
1
Gallegos, José-Elías. Inflation persistence, noisy information and the Phillips curve. Madrid: Banco de España, fevereiro de 2023. http://dx.doi.org/10.53479/29569.
Texto completo da fonteResumo:
A vast literature has documented how US inflation persistence has fallen in recent decades, but this finding is difficult to explain in monetary models. Using survey data on inflation expectations, I document a positive co-movement between ex-ante average forecast errors and forecast revisions (suggesting forecast sluggishness) from 1968 to 1984, but no co-movement thereafter. I extend the New Keynesian setting to include noisy and dispersed information about the aggregate state, and show that inflation is more persistent in periods of greater forecast sluggishness. My results suggest that changes in firm forecasting behavior explain around 90% of the fall in inflation persistence since the mid-1980s. I also find that the changes in the dynamics of the Phillips curve can be explained by the change in information frictions. After controlling for changes in information frictions, I estimate only a modest decline in the slope. I find that a more significant factor in the dynamics of the Phillips curve is the shift towards greater forward-lookingness and less backward-lookingness. Finally, I find evidence of forecast underrevision in the post-COVID period, which explains the increase in the persistence of current inflation.
2
Lopez, Pierlauro, David Lopez-Salido e Francisco Vazquez-Grande. Nominal rigidities and the term structures of equity and bond returns. Federal Reserve Bank of Cleveland, maio de 2023. http://dx.doi.org/10.26509/frbc-wp-202311.
Texto completo da fonteResumo:
We present a production economy with nominal price rigidities that explains several asset pricing facts, including a downward-sloping term structure of the equity premium, upward sloping term structures of nominal and real interest rates, and the cyclical variation of the term structures. In the model, after a productivity shock a countercyclical labor share exacerbates the procyclicality of dividends, and hence their riskiness, and generates countercyclical inflation. The dividend share gradually increases after a negative productivity shock as the price level increases sluggishly, so the payoffs of short-duration dividend claims (bonds) are more (less) procyclical than the payoffs of long-duration claims (bonds). A slow-moving external habit then produces large and countercyclical prices for these risks as well as high risk premia at very long horizons. In bad times, the slope of equity (bond) yields for the observable maturities becomes more negative (more positive), but risk premia also increase at longer horizons, and market equity premia end up increasing by more than short-run equity premia. The simultaneous presence of market and home consumption habits allows for uniting habits and a production economy without compromising the model’s ability to fit macroeconomic variables. The central bank’s anti-inflationary stance plays a key role in shaping equity and bond prices.
3
Giovando, Jeremy, Wyatt Reis, Rose Shillito, Elizabeth Shaloka, Christina Chow, Michael Kohn e Natalie Memarsadeghi. Post-wildfire curve number estimates for the Southern Rocky Mountains in Colorado, USA. Engineer Research and Development Center (U.S.), junho de 2024. http://dx.doi.org/10.21079/11681/48652.
Texto completo da fonteResumo:
The curve number method first developed by the US Department of Agriculture Soil Conservation Service (now the Natural Resources Conservation Service) is often used for post-wildfire runoff assessments. These assessments are critical for land and emergency managers making decisions on life and property risks following a wildfire event. Three approaches (i.e., historical event observations, linear regression model, and regression tree model) were used to help estimate a post-wildfire curve number from watershed and wildfire parameters. For the first method, we used runoff events from 102 burned watersheds in Colorado, southern Wyoming, northern New Mexico, and eastern Utah to quantify changes in curve number values from pre- to post-wildfire conditions. The curve number changes from the measured runoff events vary substantially between positive and negative values. The measured curve number changes were then associated with watershed characteristics (e.g., slope, elevation, northness, and eastness) and land cover type to develop prediction models that provide estimates of post-wildfire curve number changes. Finally, we used a regression tree method to demonstrate that accurate predications can be developed using the measured curve number changes from our study domain. These models can be used for future post-wildfire assessments within the region.
4
Tao, Yang, Amos Mizrach, Victor Alchanatis, Nachshon Shamir e Tom Porter. Automated imaging broiler chicksexing for gender-specific and efficient production. United States Department of Agriculture, dezembro de 2014. http://dx.doi.org/10.32747/2014.7594391.bard.
Texto completo da fonteResumo:
Extending the previous two years of research results (Mizarch, et al, 2012, Tao, 2011, 2012), the third year’s efforts in both Maryland and Israel were directed towards the engineering of the system. The activities included the robust chick handling and its conveyor system development, optical system improvement, online dynamic motion imaging of chicks, multi-image sequence optimal feather extraction and detection, and pattern recognition. Mechanical System Engineering The third model of the mechanical chick handling system with high-speed imaging system was built as shown in Fig. 1. This system has the improved chick holding cups and motion mechanisms that enable chicks to open wings through the view section. The mechanical system has achieved the speed of 4 chicks per second which exceeds the design specs of 3 chicks per second. In the center of the conveyor, a high-speed camera with UV sensitive optical system, shown in Fig.2, was installed that captures chick images at multiple frames (45 images and system selectable) when the chick passing through the view area. Through intensive discussions and efforts, the PIs of Maryland and ARO have created the protocol of joint hardware and software that uses sequential images of chick in its fall motion to capture opening wings and extract the optimal opening positions. This approached enables the reliable feather feature extraction in dynamic motion and pattern recognition. Improving of Chick Wing Deployment The mechanical system for chick conveying and especially the section that cause chicks to deploy their wings wide open under the fast video camera and the UV light was investigated along the third study year. As a natural behavior, chicks tend to deploy their wings as a mean of balancing their body when a sudden change in the vertical movement was applied. In the latest two years, this was achieved by causing the chicks to move in a free fall, in the earth gravity (g) along short vertical distance. The chicks have always tended to deploy their wing but not always in wide horizontal open situation. Such position is requested in order to get successful image under the video camera. Besides, the cells with checks bumped suddenly at the end of the free falling path. That caused the chicks legs to collapse inside the cells and the image of wing become bluer. For improving the movement and preventing the chick legs from collapsing, a slowing down mechanism was design and tested. This was done by installing of plastic block, that was printed in a predesign variable slope (Fig. 3) at the end of the path of falling cells (Fig.4). The cells are moving down in variable velocity according the block slope and achieve zero velocity at the end of the path. The slop was design in a way that the deacceleration become 0.8g instead the free fall gravity (g) without presence of the block. The tests showed better deployment and wider chick's wing opening as well as better balance along the movement. Design of additional sizes of block slops is under investigation. Slops that create accelerations of 0.7g, 0.9g, and variable accelerations are designed for improving movement path and images.