Results 21 to 30 of about 29,170 (215)
Uncertainty Analysis of Neutron Diffusion Eigenvalue Problem Based on Reduced-order Model
Yuanzineng kexue jishu, 2023 In order to improve the efficiency of core physical uncertainty analysis based on sampling statistics, the proper orthogonal decomposition (POD) and Galerkin projection method were combined to study the application feasibility of reduced-order model ...
In order to improve the efficiency of core physical uncertainty analysis based on sampling statistics, the proper orthogonal decomposition (POD) and Galerkin projection method were combined to study the application feasibility of reduced-order model based on POD-Galerkin method in core physical uncertainty analysis. The two-dimensional two group TWIGL benchmark question was taken as the research object, the key variation characteristics of the core flux distribution were extracted under the finite perturbation of the group constants of each material region, and the full-order neutron diffusion problem was projected on the variation characteristics to establish a reduced-order neutron diffusion model. The reduced-order model was used to replace the full-order model to carry out the uncertainty analysis of the group constants of the material region. The results show that the bias of the mathematical expectation of keff calculated by reduced-order and full-order models is close to 1 pcm. In addition, compared with the calculation time required for uncertainty analysis of full-order model, the analysis time of reduced-order model (including the calculation time of the full-order model required for the construction of reduced-order model) is only 11.48%, which greatly improves the efficiency of uncertainty analysis. The biases of mathematical expectation of keff calculated by reduced-order and full-order models based on Latin hypercube sampling and simple random sampling are less than 8 pcm, and under the same sample size, the bias from the Latin hypercube sampling result is smaller. From the TWIGL benchmark test results, under the same sample size, Latin hypercube sampling method is more recommended for POD-Galerkin reduced-order model.
doaj
Between the Profiles Pay Per View and the Protection of Personal Data: the Product is You
Advances in Distributed Computing and Artificial Intelligence Journal, 2017 Perhaps in the past was difficult to imagine that the moment in which someone could register each purchase that has been made, each book that has been read or each thing that has been said would come.
Ana Karin CHÁVEZ VALDIVIA
doaj +1 more source
IDEAL PROJECTIONS AND FORCING PROJECTIONS
The Journal of Symbolic Logic, 2014 AbstractIt is well known that saturation of ideals is closely related to the “antichain-catching” phenomenon from Foreman–Magidor–Shelah [10]. We consider several antichain-catching properties that are weaker than saturation, and prove:(1)If${\cal I}$is a normal ideal on$\omega _2 $which satisfiesstationary antichain catching, then there is an inner ...
Cox, Sean, Zeman, Martin
openaire +6 more sources
The epidemic of thyroid cancer in China: Current trends and future prediction
Frontiers in Oncology, 2022 BackgroundThyroid cancer (TC) is one of the most common cancers in China. The aim of this study was to identify the potential age, period, and cohort effect under the long-term trends in TC incidence and mortality, making projections up to 2030 ...
Jiayuan Wu +6 more
doaj +1 more source
Projects, Project Capabilities and Project Organizations [PDF]
, 2011 This chapter clarifies our understanding of the project-based firm (PBF) by sharpening the theoretical foundations of project capabilities. It emphasizes the differences between project capabilities that eliminate variance in project outcomes (to control costs and add value) and economies of scale that reduce costs across multiple projects.
Nightingale, P. +2 more
openaire +2 more sources
Study on Gamma Spectrum Stabilization Method for SiPM-GAGG(Ce) Detector
Yuanzineng kexue jishu, 2023 Silicon photomultiplier (SiPM) is a new type of photoelectric conversion device with high gain and low power consumption since the 21st century. It consists of thousands of single photon avalanche diodes (SPADs) operating in Geiger mode connected in ...
LEI Wenming;LI Jinglun;AI Xianyun;XIAO Wuyun;ZHANG Jipeng;XIAO Xiong;ZHANG Bin;ZHAO Wei;WANG Ying
doaj
DOA Estimation for Highly Correlated and Coherent Multipath Signals with Ultralow SNRs
International Journal of Antennas and Propagation, 2019 In a typical multipath propagation environment, there exists a strong direct path signal accompanying with several weak multipath signals. Due to the strong direct path interference and other masking effects, the Direction-of-Arrival (DOA) of a weak ...
Li Cheng +3 more
doaj +1 more source
Frontiers in Neuroanatomy, 2020 ObjectiveThis study aimed to investigate the direct monosynaptic projections from cortical functional regions to the cerebrospinal fluid (CSF)-contacting nucleus for understanding the functions of the CSF-contacting nucleus.MethodsThe Sprague–Dawley rats
Si-Yuan Song +7 more
doaj +1 more source
Projecting action spaces. On the interactional relevance of cesural areas in co-enactments
Open Linguistics, 2021 This article investigates the interactional relevance of weak cesuras in multimodal transitions in enactments. Previous research has pointed out that enactments are multimodally accomplished phenomena in that they do not only consist of a quotation but ...
Ehmer Oliver, Mandel Daniel
doaj +1 more source
Frontiers in Earth Science, 2022 Change of ecosystem productivity and its response to climate extremes in the context of global warming are of great interest and particular concern for ecosystem management and adaptation.
Minchu Yan +8 more
doaj +1 more source