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相关概念视频

Cell Size01:22

Cell Size

132.0K
Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
132.0K
Brick Sizes01:21

Brick Sizes

353
Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
Modular bricks are the most common type and are sized to include the mortar joint, which is essential for...
353
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

9.2K
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
9.2K
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

3.5K
3.5K
Maximum Size of Aggregate01:12

Maximum Size of Aggregate

569
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...
569
Sample Size Calculation01:19

Sample Size Calculation

6.7K
Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...
6.7K

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相关实验视频

Updated: Feb 13, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
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Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

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BrainEffeX:一个用于探索fMRI效应大小的Web应用程序.

Hallee Shearer1, Matt Rosenblatt2, Jean Ye3

  • 1Department of Psychology, Northeastern University.

Aperture neuro
|February 12, 2026
PubMed
概括
此摘要是机器生成的。

这项研究介绍了BrainEffeX,这是一个交互式网络应用程序,用于在功能性MRI (fMRI) 研究中估计效果大小. 它为常见的fMRI设计提供了精确的估计,有助于实验规划和功率分析.

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相关实验视频

Last Updated: Feb 13, 2026

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科学领域:

  • 神经成像是一种神经成像.
  • 认知神经科学 认知神经科学
  • 数据科学数据科学数据科学

背景情况:

  • 效果大小估计对于fMRI功率分析和实验设计至关重要.
  • fMRI数据的复杂性和分析技术为准确的效果大小估计带来了独特的挑战.
  • 现有的工具可能无法充分满足fMRI效应大小探索的特定需求.

研究的目的:

  • 介绍一个交互式网络应用程序,BrainEffeX,用于探索功能性MRI (fMRI) 效果图.
  • 为常见的fMRI研究设计提供精确的voxel-wise和多变量效应大小估计.
  • 为fMRI研究社区创造一个协作,不断增长的资源.

主要方法:

  • 利用大规模的fMRI数据集 (n > 500) 进行可靠的效果大小计算.
  • 典型的fMRI设计的计算效果大小:大脑行为相关性,任务与休息对比,以及功能连接性分析.
  • 开发了一个交互式Web应用程序 (neuroprismlab.shinyapps.io/BrainEffeX) 用于可视化和探索这些效果地图.

主要成果:

  • 从大型fMRI数据集生成精确的voxel-wise和多变量效应大小估计.
  • 在各种fMRI分析类型中展示了应用程序的实用性,包括激活和连接地图.
  • 在标准的fMRI研究范式中建立了理解效应大小的基础资源.

结论:

  • BrainEffeX为研究人员提供了一种有价值的工具,可以探索fMRI效应大小,并为实验设计提供信息.
  • 该应用程序有助于更深入地了解典型的fMRI研究中的效应大小.
  • 鼓励大数据集的社区贡献,以扩大资源的范围和准确性.