Search Results

Search Results

Refine this search

6,742 results

Project

3x3x3 LED Cube

LEDs (light-emitting diodes) are rectifying semiconductor devices that convert electrical energy into electromagnetic radiation. You can use these devices to create a 3-dimensional light display. LED cubes require some care and good soldering skills…

Project

Arduino Oscilloscope

An oscilloscope is a device that allows you to see an electronic signal so that it appears as a waveform. Traditional oscilloscopes work by amplifying a signal to control the position of a dot on the y-axis (vertical axis) of a cathode-ray tube…

Project

Laser-Grid Intruder Alarm

This is a working alarm. It uses a laser beam that bounces between mirrors attached to two walls that face each other. The figure to the right has been digitally edited to show the path of the beam. When the beam is broken, a buzzer sounds.This…

Project

Levitation Machine

This project allows you to use electromagnetic levitation to suspend a globe of the world above a surface. The "globe" is actually a table tennis ball painted to look like a globe. Keeping it in place requires careful control of electrical current…

Project

Pulse Generator Circuit

A pulse generator circuit is an important building block for many electronic projects, such as the heart of a digital clock. Its purpose is basically to switch an output on and off for as long as the circuit is activated. Sometimes, these circuits…

Project

Theremin-like Instrument

A theremin is a musical instrument developed in the 1920s by the Russian inventor, Léon Theremin. It was one of the world's first electronic musical instruments. The original invention used radio-frequency electronics and a pair of antennae. By…

Project

White-Noise Generator

White noise is a smooth hiss consisting of all audio frequencies played back at random simultaneously. Because your ears cannot "lock" onto any specific frequencies or patterns in white noise, this device has the effect of shutting off your ears to…

Project

Constant-Speed Vehicle

Everything in the universe is in motion. One basic, yet important, type of motion is constant-speed motion. This project takes you through assembly of a model battery-powered vehicle that moves at a constant speed. This particular vehicle is built…

Image

from article Deep inelastic collisions

Result thumbnail
Deep inelastic collision between an electron and a proton, where the nucleon is viewed either (a) as a blob that breaks up or (b) as composed of quarks, one of which is ejected by elastic scattering with the electron.

Image

from article Optical prism

Result thumbnail
Optical prism, consisting of a refracting medium bounded by two surfaces. Dispersion of light into its component colors is shown. (After W. J. Smith, Modern Optical Engineering, 3d ed., SPIE Press–McGraw-Hill, 2000)

Image

from article Optical prism

Result thumbnail
System of two Porro prisms, used to invert the image in traditional binoculars. (After R. E. Hopkins and R. Hanau, U.S. Military Handbook for Optical Design, republished by Sinclair Optics, 1987)

Image

from article Optical prism

Result thumbnail
Pentaprism, used in single lens reflex cameras. (a) Perspective view, showing how the prism deviates light through an angle of 90° without inverting or reverting the image. (b) Ray diagram. (After R. E. Hopkins and R. Hanau, U.S. Military Handbook…

Image

from article Optical prism

Result thumbnail
Set of two thin prisms, known as optical wedges, which can be used as an alignment device. (After P. R. Yoder, Jr., Non-image forming optical components, in Geometrical Optics, SPIE Proc., 531:206–220, 1985)

Image

from article Barracuda

Result thumbnail
Great barracuda (Sphyraena barracuda). (Photo copyright © John E. Randall)

Image

from article Sonobuoy

Result thumbnail
Launch of a sonobuoy from an antisubmarine warfare (ASW) aircraft. (a) In flight. (b) Buoy strikes the water in a nearly vertical attitude. (c) Antenna and hydrophone are positioned automatically.

Image

from article Hematologic disorders

Result thumbnail
Myelophthisic anemia results from a space-occupying lesion in the bone marrow, which hinders hematopoiesis (the process by which the cellular elements of the blood are formed). In this photomicrograph, the bone marrow space is expanded, and the…

Image

from article Hematologic disorders

Result thumbnail
Scanning electron micrograph of (top) an elongated, flattened sickle cell and (bottom) a normal red blood cell. (Credit: Callista Images/Image Source/Getty Images)

Image

from article Hematologic disorders

Result thumbnail
Colored scanning electron micrograph of round leukocytes from a patient with leukemia. (Credit: Steve Gschmeissner/Science Photo Library)

Image

from article J/psi particle

Result thumbnail
Online data from August and October 1974, showingexistence of J/psi particle. (After J. J. Aubert et al., Discovery of the new particle, J. Nuc. Phys., B89(1):1–18, 1975)

Image

from article Xenophyophorida

Result thumbnail
Xenophyophorids. (a) Stannoma dendroides. (b) Stannophyllum zonarium. (c) Psammetta erythrocytomorpha, section showing interlacing tubules and dark inclusions of uncertain nature.

Image

from article Helmholtz coils

Result thumbnail
Helmholtz coils, arranged with common axis and connected in series. (After L. B. Loeb, Fundamentals of Electricity and Magnetism, 3d ed., Wiley, 1947)

Image

from article Helmholtz coils

Result thumbnail
Separate and combined fields of Helmholtz coils. Note the region of constant resultant field at point P. (After L. B. Loeb, Fundamentals of Electricity and Magnetism, 3d ed., Wiley, 1947)

Image

from article Medical bacteriology

Result thumbnail
Microscopic view of bacterial pneumonia, which is a type of pneumonia caused by bacterial infection. (Credit: Stocktrek Images/Corbis)

Image

from article Medical bacteriology

Result thumbnail
Bacteria culture growth on agar medium in a petri dish. (Credit: Sompraaong0042/Shutterstock)

Image

from article Genetically modified organism (GMO)

Result thumbnail
Transgenic zebrafish cells. Green fluorescent protein (GFP) is a fluorescent protein first discovered in the jellyfish Aequorea victoria. GFP is commonly used as a reporter of gene expression in other species. Here, GFP is expressed by zebrafish…

Learn more about AccessScience

a female college student looking at the screen of her silver-cased laptop computer
Watch the YouTube video

flyer thumbnail

Download the flyerGet Adobe Acrobat Reader pdf icon