Results 21 to 30 of about 576,877 (314)

Monitoring and analysis of crop irrigation dynamics in Central Italy through the use of MODIS NDVI data

open access: yesEuropean Journal of Remote Sensing, 2022
A recent study has proposed and tested a semi-empirical method to estimate crop irrigation based on a water balance logic and Sentinel-2 Multi Spectral Instrument (MSI) NDVI imagery.
Marta Chiesi   +6 more
doaj   +1 more source

Exposure to Particles and Gases in a Shopping Mall: Spatial Heterogeneity and Outdoor Infiltration

open access: yesAtmosphere, 2021
Shopping malls in Hong Kong are usually located near major roads. Indoor air quality (IAQ) in these buildings is subject to infiltration of outdoor traffic-related pollutants, such as PM10, PM2.5, CO, and NO2. Furthermore, the existence of indoor sources
Alison Tan-Yui Li   +4 more
doaj   +1 more source

Spatial variation in attributable risks [PDF]

open access: yesSpatial and Spatio-temporal Epidemiology, 2015
The attributable risk (AR) measures the contribution of a particular risk factor to a disease, and allows estimation of disease rates specific to that risk. While previous studies consider variability in ARs over demographic categories, this paper considers the extent of spatial variability in ARs estimated from multilevel data with confounders both at
openaire   +3 more sources

Spatial Dependence of Average Prices for Product Categories and Its Change over Time: Evidence from Daily Data

open access: yesForecasting, 2022
The price of market products is the result of the interaction of supply and demand. However, within the same country, prices can vary significantly, especially during crisis periods.
Venera Timiryanova   +3 more
doaj   +1 more source

Spatial variation of fruit trees in Heet district for the period 2009-2019 [PDF]

open access: yesمجلة جامعة الأنبار للعلوم الإنسانية, 2021
The research deals with a study and analysis of the spatial variation of fruit trees in the Heet district for the period (2009_2019), and identifies the rate of change between them, by discussing the natural and human characteristics that led to ...
Moaz R. Nassar, Taha A. Abdel
doaj   +1 more source

Does residence time affect responses of alien species richness to environmental and spatial processes? [PDF]

open access: yes, 2012
One of the most robust emerging generalisations in invasion biology is that the probability of invasion increases with the time since introduction (residence time). We analysed the spatial distribution of alien vascular plant species in a region of north-
Dainese,Matteo   +5 more
core   +1 more source

Spatiotemporal Patterns and Characteristics of PM2.5 Pollution in the Yellow River Golden Triangle Demonstration Area

open access: yesAtmosphere, 2023
Improving air quality in the Yellow River Golden Triangle Demonstration Area (YRGTDA) is an important practice for ecological protection and high-quality development in the Yellow River Basin.
Ning Jin   +7 more
doaj   +1 more source

Spatial variability of hosts, parasitoids and their interactions across a homogeneous landscape

open access: yesEcology and Evolution, 2020
Species assemblages and their interactions vary through space, generating diversity patterns at different spatial scales. Here, we study the local‐scale spatial variation of a cavity‐nesting bee and wasp community (hosts), their nest associates ...
Anna Torné‐Noguera   +3 more
doaj   +1 more source

Regional estimation of sediment yield using monthly sediment rating curve in Qarasu watershed [PDF]

open access: yesتحقیقات کاربردی علوم جغرافیایی, 2023
This study was aimed at identification and determination the spatial variations of sediment yield in Qarasu watershed located in Ardebil province, NW Iran, considering the negative consequences of erosion and sediment yield.
fariba Esfandiary Darabad   +1 more
doaj  

Variational principlesvs. Spatial homogeneity

open access: yesIl Nuovo Cimento B, 1994
In this paper the homogeneity ansatz is imposed at the level of Einstein's equations and/or at the level of the action. The commutativity of these operations, as far as the resulting equations are concerned, is reinvestigated. The main result obtained is that, when the restrictions imposed by the isometry group are supplemented by the restrictions on ...
CHRISTODOULAKIS, T, KORFIATIS, E
openaire   +2 more sources

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