Results 21 to 30 of about 6,225 (246)

Investigation of Spatial Variation of Some Soil Properties Using Geostatistical Methods (Case study: Margon Town, Kohgiluyeh and Boyer-Ahmad Province, Iran) [PDF]

محیط زیست و مهندسی آب
The aim of this study was to investigate the spatial variation of some soil properties such as soil texture, organic carbon content, soil pH and electrical conductivity (EC) using geostatistical methods in Margon town, Kohgiluyeh and Boyer-Ahmad province,
Vali Behnam, Ali Karami, Sedigheh , Safarzadeh Shirazi   +2 more
doaj   +1 more source

Detailed mapping of soil texture of a paddy growing soil using multivariate geostatistical approaches

Tropical Agricultural Research, 2018
This study was conducted to explore performances of multivariate geostatistical techniques, co-kriging and regression kriging in contrast to univariate ordinary kriging, to generate detailed maps of soil texture by using proximally sensed apparent ...
R. A. A. S. Rathnayaka, U. W. A. Vitharana, W. K. Balasooriya   +2 more
doaj   +1 more source

Multi-fidelity sequential constraint updating optimization approach based on confidence intervals and its application

Zhongguo Jianchuan Yanjiu, 2021
Objectives This study addresses the problem of time-consuming simulation in the optimization design of underwater structures. Focusing on time-consuming and non-time-consuming targets and constraints, it proposes an optimization method for constrained ...
Jiachang QIAN, Yuansheng CHENG, Jinlan ZHANG   +2 more
doaj   +1 more source

Robust variable-fidelity optimization of microwave filters using co-Kriging and trust regions [PDF]

, 2013
A
Couckuyt, Ivo, Dhaene, Tom, Koziel, S, Leifsson, L   +3 more
core   +2 more sources

Multi-objective optimization of a wing fence on an unmanned aerial vehicle using surrogate-derived gradients [PDF]

, 2020
In this paper, the multi-objective, multifidelity optimization of a wing fence on an unmanned aerial vehicle (UAV) near stall is presented. The UAV under consideration is characterized by a blended wing body (BWB), which increases its efficiency, and a ...
Couckuyt, Ivo, Degroote, Joris, Dhaene, Tom, Knudde, Nicolas, Wauters, Jolan   +4 more
core   +1 more source

Multi-objective design of antenna structures using variable-fidelity EM simulations and co-kriging [PDF]

, 2014
A methodology for low-cost multi-objective design of antenna structures is proposed. To reduce the computational effort of the design process the initial Pareto front is obtained by optimizing the response surface approximation (RSA) model obtained from ...
Couckuyt, Ivo, Dhaene, Tom, Koziel, S, Ogurtsov, S   +3 more
core   +1 more source

Estimating rainfall and water balance over the Okavango River Basin for hydrological applications [PDF]

, 2006
A historical database for use in rainfall-runoff modeling of the Okavango River Basin in Southwest Africa is presented. The work has relevance for similar data-sparse regions.
Adeyewa, Adler, Brath, Cornelis Vanderpost, Denis Hughes, Dominic Kniveton, Gan, Grimes, Haddad, Julie Wilk, Kummerow, Kummerow, Kummerow, Lebel, Lotta Andersson, Martin C. Todd, McCarthy, Nash, Negri, New, Oki, Russell Layberry, Susan Ringrose, Weber, Wilk   +24 more
core   +2 more sources

Fast Performance Modeling across Different Database Versions Using Partitioned Co-Kriging

Applied Sciences, 2021
Database systems have a large number of configuration parameters that control functional and non-functional properties (e.g., performance and cost). Different configurations may lead to different performance values.
Rong Cao, Liang Bao, Shouxin Wei, Jiarui Duan, Xi Wu, Yeye Du, Ren Sun   +6 more
doaj   +1 more source

Spatial Estimation of Sodium Adsorption Ratio (SAR) and Chlorine in Groundwater Using Geostatistical Methods [PDF]

علوم و مهندسی آبیاری, 2011
Having knowledge of groundwater quality in arid and semi-arid areas can result sustainability of this valuable resource. For this reason, it is necessary to estimate Sodium Adsorption Ratio (SAR) and Chlorine in the groundwater quality accurately ...
A. Izadi, M. Delghandi, A. R. Hooshmand, M. Farasati   +3 more
doaj  

Optimale Methoden zur Interpolation von Umweltvariablen in Geographischen Informationssystemen [PDF]

Geographica Helvetica
In Geographie Information Systems there are many applications where the objeets of study can only be described by sampling information at selected point locations and by subsequent interpolation.
P. A. Burrough
doaj   +1 more source