Dark-field microscopy (also called dark-ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image. As a result, the field around the specimen (i.e., where there is no specimen to scatter the beam) is generally dark. In optical microscopes a darkfield condenser lens must be used, which directs a cone of light away from the objective lens. To maximize the scattered light-gathering power of the objective lens, oil immersion is used and the numerical aperture (NA) of the objective lens must be less than 1.0. Objective lenses with a higher NA can be used but only if they have an adjustable diaphragm, which reduces the NA. Often these objective lenses have a NA that is variable from 0.7 to 1.25. (Wikipedia).
What kind of particles comprise the dark matter?
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From playlist Science Unplugged: Dark Matter
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From playlist Science Unplugged: Physics
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From playlist Science Unplugged: Cosmology
Dark Matter Detection with SuperCDMS (Modelling the Invisible)
How do we detect something that barely interacts with everything we see around us? You may have heard the term ‘Dark Matter’ without a convincing explanation of what it actually is - that is because no-one really knows! Many astronomical observations have shown effects that cannot be exp
From playlist Searching for Dark Matter
What's the difference between dark matter and dark energy?
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From playlist Science Unplugged: Dark Energy
In this video I explain just what physicists mean when they speak about "dark matter" and what reasons we have to think that dark matter exists. In my two follow-up videos, I speak about the alternative explanation, modified gravity, and explain why the right solution might well be a combi
From playlist Physics
Colored Shadows Exhibit I Exploratorium
Not all shadows are black. Red, green, and blue lights shine on this wall, combining to make white. As you move in front of the wall, your body can block one, two, or all three of the lights, resulting in shadows of various colors.
From playlist Exploratorium Exhibits
DARK UNIVERSE, the new Hayden Planetarium Space Show premiering November 2, 2013, at the American Museum of Natural History, is produced by an acclaimed team that includes astrophysicists and data visualization experts. DARK UNIVERSE celebrates the pivotal discoveries that have led us to
From playlist Space
Dark Matter and Galaxy Rotation
Deducing the presence of Dark Matter from the rotational velocities of stars in galaxies.
From playlist Cosmology
MIT 7.016 Introductory Biology, Fall 2018 Instructor: Adam Martin View the complete course: https://ocw.mit.edu/7-016F18 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP63LmSVIVzy584-ZbjbJ-Y63 Professor Martin introduces cell imaging techniques, which are tools that all
From playlist MIT 7.016 Introductory Biology, Fall 2018
Anne Sentenac - A unified description of 3D diffraction microscopy - IPAM at UCLA
Recorded 14 October 2022. Anne Sentenac of the Fresnel Institute presents "A unified description of 3D diffraction microscopy" at IPAM's Diffractive Imaging with Phase Retrieval Workshop. Abstract: The purpose of this talk is to present a general, unified description of optical diffraction
From playlist 2022 Diffractive Imaging with Phase Retrieval - - Computational Microscopy
The Microscope Upgrades We've Made Along The Way | Compilation
Go to https://microcosmos.store before August 8th to get 10% off of almost everything in the store and to pick up a limited edition Dark Mode Hydra T-Shirt! This channel wouldn’t be what it is if it weren’t for one very key invention: the microscope. Everything we see, we see with the aid
From playlist Season 6
Twitch Talks - Image Computation for Microscopy
Presenter: Markus van Almsick Wolfram Research developers demonstrate the new features of Version 12 of the Wolfram Language that they were responsible for creating. Previously broadcast live on September 3, 2019 at twitch.tv/wolfram. For more information, visit: https://www.wolfram.com/l
From playlist Twitch Talks
Microscopes: optical vs SEM vs TEM vs AFM
In order to examine defects and imperfections in materials, we need microscopes capable of enhancing our vision beyond the human eye capability. To access the micro, nano, and atomic scales needed we must rely on different microscopes. The microscope options vary immensely in terms of cost
From playlist Materials Sciences 101 - Introduction to Materials Science & Engineering 2020
Mod-01 Lec-37 Transmission Electron Microscopy
Nanostructures and Nanomaterials: Characterization and Properties by Characterization and Properties by Dr. Kantesh Balani & Dr. Anandh Subramaniam,Department of Nanotechnology,IIT Kanpur.For more details on NPTEL visit http://nptel.ac.in.
From playlist IIT Kanpur: Nanostructures and Nanomaterials | CosmoLearning.org
Colin Ophus - Multi-dimensional scanning transmission electron microscopy to solve 3D nanostructures
Recorded 24 October 2022. Colin Ophus of Lawrence Berkeley Laboratory presents "Using multi-dimensional scanning transmission electron microscopy to solve 3D nanostructures using atomic electron tomography" at IPAM's Mathematical Advances for Multi-Dimensional Microscopy Workshop. Abstract
From playlist 2022 Mathematical Advances for Multi-Dimensional Microscopy
Computational Microscopy: Utilizing Image Processing and Neural Networks
www.wolfram.com/wolfram-u/ This event features demos and tutorials using Wolfram technologies for 2D and 3D image analysis and computer vision. Wolfram's integrated workflow combines high level image processing and machine learning in one system, allowing to solve a variety of problems fr
From playlist Computational Microscopy
Recorded 25 October 2022. Andy Minor of the University of California, Berkeley, presents at IPAM's Mathematical Advances for Multi-Dimensional Microscopy Workshop. Learn more online at: http://www.ipam.ucla.edu/programs/workshops/workshop-ii-mathematical-advances-for-multi-dimensional-micr
From playlist 2022 Mathematical Advances for Multi-Dimensional Microscopy
Exploring the Dark Universe: Dark Matter
Much of what we know about dark matter is what it's not. Astrophysicist and curator Mordecai-Mark Mac Low gives an overview of what we understand about dark matter and how it was discovered. Visit http://www.amnh.org/dark-universe to explore more about the "dark universe." Episode 1: Ex
From playlist Space
Upgrading a Cheap Microscope Lets You See Rainbows! - Polarized Light Mod
Normally the ability to do polarized light microscopy at least doubles the price tag of any new microscope you purchase. And that's kind've of a shame because with only the addition of 2 simple polarizers a whole new world of detail is opened up. This mod requires only the purchase of 2
From playlist Physics