Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Types of Aggregate Grading01:15

Types of Aggregate Grading

591
Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
591
Aggregates Classification01:29

Aggregates Classification

345
Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
345
Maximum Size of Aggregate01:12

Maximum Size of Aggregate

157
The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
157
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

119
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
119
Graded Potential01:19

Graded Potential

4.0K
Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or...
4.0K
Generalization, Discrimination, and Extinction01:24

Generalization, Discrimination, and Extinction

613
Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
613

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

ATP13A2 promoted cell stemness, cisplatin resistance, autophagy, and cell progression of bladder cancer.

Frontiers in immunology·2026
Same author

Association between age-adjusted visceral fat index (AVAI) and congestive heart failure: A cross-sectional study.

Science progress·2026
Same author

Analysis of the association between <i>SLCO1B1</i> gene polymorphisms and coronary heart disease risk in southern Han Chinese population and statin responses in the elderly.

Frontiers in cardiovascular medicine·2026
Same author

A machine learning framework to assess global mangrove forestation potential under current and future climate scenarios.

Environmental research·2026
Same author

V<sub>2</sub>O<sub>5</sub>/CdS Heterostructures for High-Rate Photo-Rechargeable Zinc-Ion Batteries.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same author

Influence of pigment epithelium-derived factors on H<sub>2</sub>O<sub>2</sub>-induced oxidative damage and melanin synthesis in Melan-a cells.

Biological research·2025

相关实验视频

Updated: Jul 18, 2025

Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment
08:43

Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment

Published on: August 7, 2017

7.9K

DeeperGCN:训练使用通用聚合函数的深度GCN.

Guohao Li, Chenxin Xiong, Guocheng Qian

    IEEE transactions on pattern analysis and machine intelligence
    |August 21, 2023
    PubMed
    概括
    此摘要是机器生成的。

    深度图形神经网络 (GNN) 对聚合函数敏感. 本研究介绍了通用聚合函数,提高了在大型图形学习任务上的深度GNN性能.

    更多相关视频

    Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations
    12:27

    Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations

    Published on: February 15, 2017

    7.0K
    Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy
    09:10

    Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy

    Published on: May 12, 2015

    9.5K

    相关实验视频

    Last Updated: Jul 18, 2025

    Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment
    08:43

    Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment

    Published on: August 7, 2017

    7.9K
    Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations
    12:27

    Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations

    Published on: February 15, 2017

    7.0K
    Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy
    09:10

    Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy

    Published on: May 12, 2015

    9.5K

    科学领域:

    • 机器学习 机器学习
    • 图形表示学习学习学习图形表示学习

    背景情况:

    • 图形神经网络 (GNN) 越来越多地用于在图形结构数据上的表示学习.
    • 最近的进展使得训练非常深入的GNN成为可能,在点云学习和蛋白质相互作用预测等领域取得了成功.
    • 在大尺度图表上深度GNN的性能仍然是研究的一个领域.

    研究的目的:

    • 调查聚合函数选择对深度GNN在大型图设置中的性能的影响.
    • 针对GNN对不同数据集中的标准聚合函数 (平均值,最大值,和值) 的敏感性.
    • 提出一种新的,可学习的聚合函数类,以提高深度GNN性能.

    主要方法:

    • 系统地研究聚合函数对深层GNN的影响.
    • 介绍了通用聚合函数,这是一个新的类别的变不变和可微分函数.
    • 针对特定任务量身定制的通用聚合函数参数的端到端学习.

    主要成果:

    • 在选择聚合函数时,GNN表现出显著的敏感性.
    • 一般化聚合函数扩展现有方法,提供更大的灵活性和适应性.
    • 配备了通用聚合函数的深度残留GNN可以在开放图基准 (OGB) 数据集上获得最先进的结果.

    结论:

    • 聚合函数的选择对于深度GNN性能至关重要,特别是在大规模的场景中.
    • 一般化聚合函数提供了一个强大的和可适应的解决方案来改进深度GNN.
    • 这项工作通过提供更有效的聚合方法来推进对图形的深度学习.