Results 41 to 50 of about 360,351 (166)

Spatial Variability of Grouting Layer of Shield Tunnel and Its Effect on Ground Settlement

open access: yesApplied Sciences, 2020
This study aims to investigate the effect of the spatial variability of grouting-layer thickness on ground-surface settlement caused by shield tunneling and to provide a rational prediction method.
Zhongzheng Wang   +2 more
doaj   +1 more source

Interannual climate variability improves niche estimates for ectothermic but not endothermic species

open access: yesScientific Reports, 2023
Climate is an important limiting factor of species’ niches and it is therefore regularly included in ecological applications such as species distribution models (SDMs).
Dirk Nikolaus Karger   +6 more
doaj   +1 more source

A new approach to model the spatial and temporal variability of recharge to karst aquifers [PDF]

open access: yesHydrology and Earth System Sciences, 2012
In karst systems, near-surface dissolution of carbonate rock results in a high spatial and temporal variability of groundwater recharge. To adequately represent the dominating recharge processes in hydrological models is still a challenge, especially in ...
A. Hartmann   +4 more
doaj   +1 more source

Spatial Interdependence and Instrumental Variable Models

open access: yesPolitical Science Research and Methods, 2017
Instrumental variable (IV) methods are widely used to address endogeneity concerns in re- search using observational data. Yet, a specific kind of endogeneity – spatial interdependence – is regularly ignored in this research, threatening claims of causal identification.
Betz, Timm   +2 more
openaire   +3 more sources

Computational system for geostatistical analysis

open access: yesScientia Agricola, 2004
Geostatistics identifies the spatial structure of variables representing several phenomena and its use is becoming more intense in agricultural activities.
Laurimar Gonçalves Vendrusculo   +3 more
doaj  

How model and input uncertainty impact maize yield simulations in West Africa

open access: yesEnvironmental Research Letters, 2015
Crop models are common tools for simulating crop yields and crop production in studies on food security and global change. Various uncertainties however exist, not only in the model design and model parameters, but also and maybe even more important in ...
Katharina Waha   +3 more
doaj   +1 more source

Exploring the variability and geographical patterns of population characteristics: Regional and spatial perspectives

open access: yesMoravian Geographical Reports, 2017
The variability and geographical patterns of population characteristics are key topics in Human Geography. There are many approaches to exploring and quantitatively measuring this issue.
Netrdová Pavlína, Nosek Vojtěch
doaj   +1 more source

Assessing the Role of Spatial Rainfall Variability on Watershed Response based on Weather Radar Data (A Case Study of the Gard Region, France)

open access: yesInternational Journal of Technology, 2018
The primary input for hydrological the hydrological model is rainfall. The accurate illustration of rainfall in time and space is important for rainfall-runoff modeling since it impact the hydrological responses.
Evi Anggraheni   +4 more
doaj   +1 more source

Spatial variability - So what?

open access: yes, 2006
Since the landmark papers of Conway and Abrahamson many studies have tried to quantify spatial variability. Many different methods have been used and the studies covered a variety of scales. Accordingly, some results appear contradictory, suggesting that the degree of spatial variation varies widely.
Schweizer, Jürg   +3 more
openaire   +2 more sources

The effects of rainfall and vegetation on litterfall production in the semiarid region of northeastern Brazil

open access: yesBrazilian Journal of Biology
Litterfall has a strong influence on biodiversity and on the chemical and physical characteristics of the soil. Its production can be quite variable over time and space, and can be influenced by both natural and anthropogenic factors.
MCA Lopes, VFP Araújo, A Vasconcellos
doaj   +1 more source

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