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Radiometric Dating Revisited 
Radiometric dating (often called radioactive dating) is a technique used to date materials, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1] It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials. Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change. Radiometric dating is also used to date archaeological materials, including ancient artifacts. Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.
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Added By - justin
Subject - Earth and Atmospheric Sciences
Document Type - Definition
Video Duration - 00:03:07


Drawing Basics - Part 1 Choosing & Using Pape... 
Part 1 of a series of videos about the basic materials needed for drawing & sketching. Includes hints and tips on using a variety of drawing materials including pencils, pen & ink, charcoa, water-soluble pencils and even erasers. http://www.how-to-draw-and-paint.com/
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Added By - 123
Subject - Arts
Document Type - Demonstration
Video Duration - 00:08:46


Customized Y-Shaped Nanotubes Can Compute 
Researchers at UC San Diego and Clemson University have discovered that specially synthesized carbon nanotube structures exhibit electronic properties that are improved over conventional transistors used in computers. In a paper published* in the September issue of Nature Materials and released online on August 14, UCSD Mechanical and Aerospace Engineering professors Prabhakar Bandaru and Sungho Jin, graduate student Chiara Daraio, and Clemson physicist Apparao M. Rao reported that Y-shaped nanotubes behave as electronic switches similar to conventional MOS (metal oxide semiconductor) transistors, the workhorses of modern microprocessors, digital memory, and application-specific integrated circuits.
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Added By - autocrawler
Subject - Nanoscience and Nanotechnology
Document Type - Demonstration
Video Duration - 00:03:39


Superhydrophobic Surface Technology 
This technology can be used to create icing resistant surfaces on airplane wings, toilets that stay clean by themselves, zero rust surfaces and many more. It is a superhydrophobic material developed by Prof Chunlei Guo, professor of optics at University of Rochester and his team. Using laser to etch an unique pattern of surface structures at micro and nano scales the surface of materials is rendered hydrophobic. Unlike the conventional approach of chemical coating to make surfaces hydrophobic this approach gives much stronger hydrophobia and doesn\'t come with the risk of peeling off. The materials Guo has created are much more slippery than Teflon. The article, “Multifunctional surfaces produced by femtosecond laser pulses,” was published in the Journal of Applied Physics on January 20, 2015 (DOI: 10.1063/1.4905616). It can be accessed at: http://scitation.aip.org/content/aip/journal/jap/117/3/10.1063/1.4905616
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Added By - A Ghosh
Subject - Material Science and Engineering
Document Type - Demonstration
Video Duration - moderate


Introduction to Plasma 
Amazing things plasma can do by Michael Sweatt and Bobby Bruce
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Added By - eternes
Subject - Material Science and Engineering
Document Type - Vid/Terp 2008 www.umd.edu
Video Duration - 00:02:57


Statistical Thermodynamics 
Statistical mechanics or thermodynamics is the application of probability theory, which includes mathematical tools for dealing with large populations, to the field of mechanics, which is concerned with the motion of particles or objects when subjected to a force. Statistical mechanics, sometimes called statistical physics, can be viewed as a subfield of physics and chemistry. It provides a framework for relating the microscopic properties of individual atoms and molecules to the macroscopic or bulk properties of materials that can be observed in everyday life, therefore explaining thermodynamics as a natural result of statistics and mechanics (classical and quantum) at the microscopic level. In particular, it can be used to calculate the thermodynamic properties of bulk materials from the spectroscopic data of individual molecules. This ability to make macroscopic predictions based on microscopic properties is the main asset of statistical mechanics over thermodynamics. Both theories are governed by the second law of thermodynamics through the medium of entropy. However, entropy in thermodynamics can only be known empirically, whereas in statistical mechanics, it is a function of the distribution of the system on its micro-...
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Added By - sidpatel
Subject - Mechanical Engineering
Document Type -
Video Duration - 00:08:08


Video Journey Into Nanotechnology 

Published for educational purposes only.Please visit http://nano.cancer.gov/ for further information.

Nanotechnology, shortened to "Nanotech", is the study of the control of matter on an atomic and molecular scale. Generally nanotechnology deals with structures of the size 100 nanometers or smaller, and involves developing materials or devices within that size. Nanotechnology is very diverse, ranging from novel extensions of conventional device physics, to completely new approaches based upon molecular self-assembly, to developing new materials with dimensions on the nanoscale, even to speculation on whether we can

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Added By - 123456
Subject - Nanoscience and Nanotechnology
Document Type - Documentary
Video Duration - 00:03:20


Sound Reflection from Concave Surfaces 

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection. In acoustics, reflection causes echoes and is...

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Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:04:44


Smoke flow visualization over a wing 

In this field of aeronautical science, the flow visualization has been a nebulous observation
simply because air is invisible. The use of saw dust, tufts, fluorescent dye in oil with black light, a
recently developed laser beam and smoke, are some of th methods and materials used to attempt
flow visualization.
The use of saw dust increases the difficulty of maintenance in the wind tunnel and its
associated equipment. The tuft and oil methods show flow on the surface of the model. the laser
beam has not yet been perfected as a usable tool for this purpose. Whatever the method used, the
substance introduced into the tunnel should be non-corrosive, non-toxic, and the equipment must
be safe to handle.
The use of smoke appears to combine all the best characteristics of available methods. In
the early days, rotten wood was the popular source of smoke, (Ref. 1 and 2). However, smoke
produced by the burning wood was an eye irritant and caused an accumulation of tars.
The technique of evaporating oil by various methods was introduced to eliminate some of
the problems of the smoke, (Ref. 2). The study of smoke generators has also been reported in
England and Australia,...

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Added By - justin
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:20


Carbon Nanotubes 
Julie MacPherson talks about her work with Carbon Nanotubes and Atomic Force Microscopy. Carbon nanotubes (CNTs) are allotropes of carbon. A single-walled carbon nanotube (SWNT) is a one-atom thick sheet of graphite (called graphene) rolled up into a seamless cylinder with diameter on the order of a nanometer. This results in a nanostructure where the length-to-diameter ratio exceeds 1,000,000. Such cylindrical carbon molecules have novel properties that make them potentially useful in many applications in nanotechnology, electronics, optics and other fields of materials science. They exhibit extraordinary strength and unique electrical properties, and are efficient conductors of heat. Inorganic nanotubes have also been synthesized. Nanotubes are members of the fullerene structural family, which also includes buckyballs. Whereas buckyballs are spherical in shape, a nanotube is cylindrical, with at least one end typically capped with a hemisphere of the buckyball structure. Their name is derived from their size, since the diameter of a nanotube is in the order of a few nanometers (approximately 1/50,000th of the width of a human hair), while they can be up to several millimeters in length. Nanotubes are categorized as single-wal...
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Added By - scienceforum
Subject - Nanoscience and Nanotechnology
Document Type -
Video Duration - 00:03:32

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