Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 35 for “"VPD"”.
-
A Novel Image Retrieval Strategy Based on VPD and Depth with Pre-Processing
… We propose a visual perceptual descriptor (VPD) to extract color features from an image. Gradient direction is calculated at each pixel, and the VPD is moved over the entire image to locate regions with similar gradient direction. Color features are extracted only at these pixels. …
-
Optimizing soybean water use and nitrogen fixation to improve productivity under climate change
… is driving increases in vapor pressure deficit (VPD) in recent decades, suggesting global atmospheric drying. In a U.S. study, VPD during reproductive stages was identified as the most important predictor of soybean yield variation. Investigations into the effect of VPD on soybean yields often …
-
Pearl Millet Nutritional Quality and Fertilization of Sweet Corn in Senegal
… acids or vitamin B2 content of grains among VPD-groups. Accumulation of these constituents of pearl millet grain appear to be genetically controlled and are probably not affected by late drought stress. However, differences were noted among genotypes as the sensitive VPD-group accumulated …
-
The effects of elevated [CO₂] and decreased vapour pressure deficit on the nutrient status of maize and wheat plants under well-watered conditions
… by varying leaf-to-air vapour pressure deficits (VPD). I hypothesised that reduced mass flow at eCO₂ and at low VPD will negatively affect nutrient status in both the C₃ (wheat) and the C₄ (maize) species. In the first experiment, maize and wheat plants were grown at 400 and 800 ppm [CO₂], in …
-
Water Relations of Ponderosa Pine in Contrasting Environments: Implications for Global Climate Change
… and atmospheric vapor pressure deficit (VPD) by the end of the 21st century. For trees, the most relevant allometric component controlling water transport is the ratio of biomass allocated to leaves versus sapwood (AL/AS). Within Pinus, trees decrease ALAS in response to rising VPD. Thus, …
-
Assessment of cleft palate articulation and resonance in familiar and unfamiliar languages: English, Spanish, and Hmong.
… and overall velopharyngeal dysfunction (VPD) of English, Spanish, and Hmong samples from naïve listeners, generalist speech-language pathologists (SLPs), and specialist SLPs. The speech samples were obtained from 22 speakers, nine with a history of VPD and 13 controls. The ratings were …
-
Genotypic and Environmental Effects on Soybean Canopy Photosynthesis
… in the ambient air vapor pressure deficit (VPD) causing stomatal closure. Grain sorghum was found to be more sensitive photosynthetically to the VPD increase than cotton or soybean. The results indicate that an increase in VPD was a major factor contributing to the afternoon in CER and that …
-
Quantifying water use by temperate deciduous forests in South Korea : roles of species diversity, canopy structure, and complex terrain
… solar radiation, vapor pressure deficit (VPD), wind speed were measured from weather stations and soil water content was measured from frequency domain reflectometry (FDR) sensors at the respective study sites. Vegetation surveys, including diameter at breast height (DBH), tree density, …
-
Evaluating biomass water storage and sap flux in three semi-arid tree species in central Texas
… including atmospheric vapor pressure deficit (VPD), temperature, precipitation, and soil moisture. Our results indicate sap flux can either use internal wood water storage for daily transpiration (an inverse relationship) or be used to recharge the wood water storage (a parallel relationship) …
-
Environmental Influences on Gas Exchange in Fertilized and Non-Fertilized Stands of Loblolly Pine
… reveal that light and vapor pressure deficit (VPD) explain a majority of the variation observed in photosynthesis and transpiration, respectively. Conductance was not modeled since environmental variation did not adequately explain conductance patterns. Predicted light response curves reveal …
-
Quantifying the Sensitivity of Land-Surface Models to Hydrodynamic Stress Limitations on Transpiration
… when the soil is near the wilting point, when VPD is not limiting, and when VPD is high. Although model error patterns are site specific, there are models that are more likely to favor one pattern above the other based on the stomata conductance scheme used and its sensitivity to VPD and soil …
-
Fine root dynamics and resource uptake in a South Ecuadorian mountain rainforest as dependent on elevation
… des Wasserdampf-Sättigungsdefizits der Luft (VPD) in den drei Waldbeständen auf 1050, 1890 und 3060 m, nahm aber etwa um den Faktor drei zwischen dem untersten und dem obersten Bestand ab. Eine verminderte Saftflussrate wurde beobachtet, wenn VPD über mehrere Tage überdurchschnittlich hoch …
-
Vertical product differentiation and competition in the supermarket industry
… based on the vertical product differentiation (VPD) enciogenous sunk cost framework proposed by Sutton (1991), several empirical implications are identified and evaluated using a detailed dataset of store level observations from the supermarket industry. Chapter 2 provides a formal test of the …
-
How do trees die following low intensity fires: Exploring the hydraulic death hypothesis
… as a result of high vapor pressure deficit (VPD) in a fire-plume has been shown to reduce hydraulic conductance. Secondly, changing surface tension as water is heated has also been shown to increase the chance of cavitation. The final mechanism is a reduction in conductance as a result of …
-
Desenvolvimento de um biossensor amperométrico de DNA para detecção do Papilomavírus humano
… por Voltametria de Pulso Diferencial (VPD). Os eletrodos de trabalho e referência foram produzidos através de técnica de impressão sob uma superfície de polivinil álcool. Os mesmos foram constituídos de carbono e Ag\AgCl, respectivamente. O eletrodo de trabalho foi modificado com …
-
An analysis of the contamination by and effects of highway- generated heavy metals on roadside stream ecosystems
… highway averaged about 12,000 vehicles per day (vpd). Significant increases in the metals concentrations of sediment, benthic invertebrates, fish whole-bodies, and fish tissues (liver, kidney, and bone) were noted over the course of the study, although the increase varied in magnitude, and were …
-
Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… with RMSE of 3.1 K. Vapor pressure deficit (VPD) is retrieved to within 427.9 Pa using thermal information from AMSR-E. AMSR-E thermal information imparted 27% of the overall error in VPD estimation with the remaining error attributable to underlying algorithm assumptions. Land surface …
-
Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… with RMSE of 3.1 K. Vapor pressure deficit (VPD) is retrieved to within 427.9 Pa using thermal information from AMSR-E. AMSR-E thermal information imparted 27% of the overall error in VPD estimation with the remaining error attributable to underlying algorithm assumptions. Land surface …
-
Water use of forests along elevation gradients in the Berchtesgaden National Park
… between transpiration rates and maximum VPD and daily integrated PPFD were found for the experimental species. For the Norway spruce stands, needle nutrient concentrations were also determined. During the 2002 growing season (May- September), the seasonal patterns of tree canopy …
-
Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
… with temperature (T), vapor pressure deficit (VPD), photosynthetically active radiation (PAR) and rain were included and tested with various statistical methods (trend- and correlation-analysis, commonality analysis, time lag testing, stepwise multiple-regression, and structural equation …
Page 1 of 2