Results 21 to 30 of about 6,118,344 (310)

Modeling Site Effects in the Design and Analysis of Multi-site Trials [PDF]

open access: yesThe American Journal of Drug and Alcohol Abuse, 2011
Careful consideration of site effects is important in the analysis of multi-site clinical trials for drug abuse treatment. The statistical choices for modeling these effects have implications for both trial planning and interpretation of findings.Three broad approaches for modeling site effects are presented: omitting site from the analysis; modeling ...
Daniel J, Feaster   +2 more
openaire   +2 more sources

Microscopic origin of light emission in Al_yGa_{1-y}N/GaN superlattice: Band profile and active site [PDF]

open access: yes, 2009
We present first-principles calculations of AlGaN/GaN superlattice, clarifying the microscopic origin of the light emission and revealing the effect of local polarization within the quantum well.
Cai, D. J.   +3 more
core   +2 more sources

Site of the Visual Suppression Effect [PDF]

open access: yesNature, 1967
THERE is no general answer to the question of the possible existence and function of a centrifugal pathway to the retina. Evidence for the presence of such a system in mammalian species is controversial, but Holden1 has pointed out that in the case of the pigeon there is substantial anatomical and physiological evidence for a centrifugal system.
openaire   +2 more sources

Site effects and site amplification due to the 2009 Abruzzo earthquake [PDF]

open access: yesWIT Transactions on The Built Environment, 2011
This paper presents the results of numerical analyses carried out to assess the different seismic response of two sites in the urban area of L’Aquila, selected as representative of typical subsoil conditions in the old city centre and in the recently developed suburban Pettino district.
MONACO, Paola   +4 more
openaire   +2 more sources

浅壳与上地幔地震的水平加速度谱阻尼修正系数模型

open access: yesDizhen xuebao, 2019
对日本K-net和KiK-net台网中6 466条浅壳与上地幔地震动记录进行了统计分析,考虑四种场地类别分别建立了浅壳与上地幔地震的加速度谱阻尼修正系数模型,并利用随机效应模型将模型总残差分离为事件间残差、事件内残差(分为场地间残差和场地内残差),计算其相应的标准差,探究地震震源、路径、场地等因素对模型误差的影响。研究结果显示:所提出的模型能较好地拟合实际计算值,其随机误差整体随谱周期和阻尼比的增大而增大;震源效应导致的随机误差在谱周期小于2.0 s时小于其它效应;在大部分谱周期上 ...
Kaiwei Su, Qingsong Yang, Jiguan Liang
doaj   +1 more source

The site of interference in the saccadic Stroop effect

open access: yesVision Research, 2012
In two experiments, the source of competition in the saccadic Stroop effect was investigated. Colored strings of letters were presented at fixation with colored patches in the surround. The task of the participants was to make an eye movement to the patch in the same color as the central string of letters.
Hermens, Frouke, Walker, Robin
openaire   +10 more sources

Effective Siting of Waste Treatment Facilities [PDF]

open access: yesJournal of Environmental Economics and Management, 2002
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Minehart, Deborah, Neeman, Zvika
openaire   +1 more source

Application of Single-Station Sigma and Site-Response Characterization in a Probabilistic Seismic-Hazard Analysis for a New Nuclear Site [PDF]

open access: yes, 2014
Aleatory variability in ground-motion prediction, represented by the standard deviation (sigma) of a ground-motion prediction equation, exerts a very strong influence on the results of probabilistic seismic-hazard analysis (PSHA).
Bommer, J. J.   +4 more
core   +1 more source

Simplified probabilistic model for maximum traffic load from weigh-in-motion data [PDF]

open access: yes, 2017
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Structure and infrastructure engineering on 2016, available online at: http://www.tandfonline.com/10.1080/15732479.2016.1164728This paper reviews the simplified procedure
Casas Rius, Joan Ramon   +2 more
core   +2 more sources

Seismic response of the geologic structure underlying the Roman Colosseum and a 2-D resonance of a sediment valley

open access: yesAnnals of Geophysics, 1995
The seismic response of the geologic structure beneath the Colosseum is investigated using a two-dimensional modeling for a vertically incident plane SH wave.
P. Labak   +3 more
doaj   +1 more source

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