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8,446 results

Project

3D Floor Plan

Floor plans show walls, windows, doors, and other features of a room or building. Architects and engineers use them to study spatial relationships and describe their designs. Typically, floor plans are rendered as two-dimensional drawings.In this…

Project

3D Skull Candy Mold

Whether preparing for Halloween or just a regular day, you can make skull-shaped edibles from this project's 3D candy mold. Like many molds, this one is a hollow container into which you can pour water or hot liquids, such as gelatin, chocolate, or…

Project

3D Spur Gear

A spur gear is a common toothed wheel that works with other wheels in a set to adjust the speed, power, or direction of a complex machine. It's found in many everyday devices, such as electric screwdrivers, washing machines, and mechanical clocks…

Project

3D Terrain Map

Terrain maps are physical models that give you an at-a-glance overview of landforms. Architects, builders, and engineers often use these types of maps to provide context to proposed building designs. In this project, you'll create a layered…

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

Jumbo Foam Glider

This project takes you through the steps to build, launch, and fly a foam glider in sustained and controlled flight. Control in flight is achieved by modifying the wind the glider flies through with a large cardboard sheet (paddle). If this is your…

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

Light and Temperature Logger

Environmental research often involves the use of data loggers to record data at regular intervals over a period of time. Most data loggers are based on digital processors, and can be fairly expensive, but you can build your own. This project uses a…

Project

Pulse Generator Circuits

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

Text-Controlled RGB LED

A red, green, and blue (RGB) light-emitting diode (LED) is a useful electronic component that can produce visible light in a variety of colors. This is done by varying the intensity of the light output of the three different color LED elements (red,…

Project

Tumblewing Walkalong Glider

This project takes you through the steps to build, launch,and fly a paper airplane (glider) in sustained and controlled flight. Control in flight is achieved by modifying the wind the glider flies through with a large cardboard sheet or foam board…

Project

Ultralight Foam Glider

This project takes you through the steps to build, launch, and fly an ultralight foam glider in sustained and controlled flight. Controlled flight is achieved by modifying the wind the glider flies through with a large cardboard sheet, or paddle.The…

Project

Wind Lantern

In this project, you will build a small, vertical-axis wind turbine, or VAWT for short. VAWTs are not as efficient as their horizontal-axis cousins, but they are better suited to urban environments where wind can come from different…

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from article Anthrax

A color-enhanced scanning electron micrograph showing splenic tissue from a monkey with inhalation anthrax. Rod-shaped bacilli of Bacillus anthracis (yellow) and an erythrocyte (red) are shown. (Credit: Arthur Friedlander/National Institute of…

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from article Anthrax

Micrograph (stained with hematoxylin and eosin) showing submucosal hemorrhage in the small intestine of a person fatally affected by gastrointestinal anthrax. (Credit: Marshal Fox/Centers for Disease Control and Prevention)

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from article Glass switch

OTS current-voltage characteristics.

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from article Glass switch

OMS current-voltage characteristics.

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from article Distillation column

Elements of a distillation column.

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from article Distillation column

Contacting devices for fractionating column.

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from article Inertial confinement fusion

Ablative indirect drive and ablative direct drive. (a) In laser-illuminated, ablative indirect drive, the ICF target consists of a cylindrical hohlraum (hollow room) in which laser light is injected through the two holes in the end caps and heats…

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from article Inertial confinement fusion

X-ray images with a framing camera (developed at Lawrence Livermore National Laboratory) from a directly driven inertial confinement fusion capsule at the University of Rochester's Omega Facility. The camera has 80-ps exposure time and 55-ps time…

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from article Inertial confinement fusion

Deuterium–tritium fuel ion temperature and density at ignition, plotted against normalized radius, for a typical high-gain capsule.

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from article Inertial confinement fusion

The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL). Its driver is the world's largest laser. The 1.8 MJ of ultraviolet light (351-nm wavelength from frequency-tripled neodymium:glass laser light) is generated with…

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from article Inertial confinement fusion

Progress toward ignition on NIF is illustrated by the plot of no-burn D–T equivalent yield in number of neutrons versus the value of ρr inferred from the energy lost by fusion neutrons during passage out of the compressed fuel. These experiments…

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from article Inertial confinement fusion

View of the combined Z Machine and Z-Beamlet laser facility (lower left) with exploded view of the cross section of the Z Machine (upper left). Both will be used to drive the MagLIF capsule (right) at Sandia National Laboratories. The 10-kJ…

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from article Inertial confinement fusion

Computed capsule gains (energy yield divided by absorbed energy) from 1D simulations of the principal (radial) dynamics for ablative direct drive of a perfect capsule, which is irradiated by either 248-nm laser light or 351-nm laser light with…

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from article Inertial confinement fusion

Electra, an ∼500 J/pulse, electron-beam pumped KrF laser at the Naval Research Laboratory. It has achieved 90,000 shots in a continuous run and 330,000 shots in 8 days at 2.5–5 Hz.

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from article Inertial confinement fusion

Conceptual design of the X-target. (Credit: Heavy Ion Fusion Science Virtual National Laboratory)

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from article Governor

Ballhead governor.

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from article Governor

Isochronous governor.

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from article Governor

Hydraulic governor.

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from article Governor

Isochronous dashpot governor.

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from article Governor

Governor with force feedback.

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from article Governor

Two-way valve-differential servomotor.

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from article Hybrid control

Ignition timing maps. (a) Mechanical advance system. (b) Electronically optimized system. (After R. K. Jurgen, ed., Automotive Electronics Handbook, 2d ed., McGraw-Hill, 1999)

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from article Pigment (material)

Various colored pigments. (Credit: Leontura/Getty Images)

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from article Laser alloying

Sequence of schematic cross sections for laser alloying, with time increasing from a to f. AxxB1−x represents surface alloy (with composition fixed by x) of film elements A in substrate elements B.

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from article Laser alloying

Schematic drawings and enlarged views of material processing for (a) continuous and (b) pulsed or Q-switched laser system. deff = diameter of melt spot or melt strip; Vx = velocity of sample movement in x direction; dx, dy = displacement between…

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from article Poplar

Quaking aspen (Populus tremuloides). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)

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from article Poplar

Common poplar species. (a) Quaking aspen (P. tremuloides); leaf scar with an axial bud, leaf, and twig. (b) Bigtooth aspen (P. grandidentata); leaf, terminal bud, and twig. (c) Cottonwood poplar (P. deltoides); leaf, leaf scar, terminal bud, and…

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from article Voltage-multiplier circuit

Diode-capacitor voltage-multiplier circuits. (a) Negative voltage doubler. Diodes pass conventional current only in the directions of the arrows. Waveforms of input ac voltage, Vac with peak value Ep, and of voltages at diodes D1 and D2 and…

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from article Voltage-multiplier circuit

Dual switched-capacitor dc-to-dc converter that generates +10-V and −10-V dc sources from a single +5-V dc source. (a) Simplified circuit diagram. Switches are alternately connected to terminals A and B. C1, C2, C3, and C4 are capacitors. VCC is the…

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from article Lead

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from article Lead

Galena (lead sulfide, PbS) is an ore mined for lead. (Credit: USGS)

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from article Transmission lines

Two common transmission lines for communication. (a) Coaxial cable. (b) Strip line.

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from article Transmission lines

Equivalent circuit that represents three sections of a lossless transmission line. Each section is of length Δz, and has an inductor (L) and capacitor (C). Voltages (V ) and currents (I ), and their differences (ΔV and ΔI ) between successive…

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from article Transmission lines

Signal detection on an oscilloscope. (a) Oscilloscope pictures of voltage pulses at three locations, z1, z2, and z3, on a transmission line, successively more distant from the signal generator. (b) Oscilloscope pictures of a periodic voltage sine…

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from article Transmission lines

Transmission line with characteristic impedance Zc, terminated in a load impedance ZL. A change of coordinate system (from z to ζ) is indicated.

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from article Transmission lines

Envelope of the voltage standing wave consisting of a wave propagating from z = −∞ and being reflected at z = 0. The wavelength, λ, and the maximum and minimum voltages, Vmax and Vmin, are indicated.

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from article Transmission lines

Two waveguides, with conventional coordinates. (a) Rectangular waveguide. (b) Cylindrical waveguide.

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from article Transmission lines

Dispersion curve for a rectangular waveguide of width a, showing relationship between the propagation constant, β, and the angular frequency, ω. Here, n specifies the mode of propagation, and c is the speed of light.

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from article Transmission lines

Equivalent circuit of a power transmission line. The single-phase circuit is used to represent balanced three-phase lines. Here, R and X are the resistance and reactance (at the operational frequency), and C is the capacitance of the entire…

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from article Heat pipe

Heat transfer devices. (a) Thermosiphon, (b) Heat pipe. The heat pipe can be in any position, not just vertical as shown.

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from article Wastewater reuse

The Edward C. Little water recycling facility in El Segundo, California, USA, produces more than 30 million gallons of recycled water every day for golf courses, street sweeping, restrooms, boilers, cooling towers, and other commercial, municipal,…

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from article Wastewater reuse

Monterey County, California, USA vegetable fields irrigated with disinfected tertiary recycled water. (Credit: U.S. Environmental Protection Agency)

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from article Wastewater reuse

Types of reuse appropriate for increasing levels of treatment. (Credit: U.S. Environmental Protection Agency)

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from article Wastewater reuse

Wastewater-reuse system with a reverse osmosis process.

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from article Reactance

Circuit with a resistor and capacitor in parallel.

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from article Environmental management

Environmental management seeks to provide solutions to the practical problems that humans encounter or create, including the production of garbage and waste. (Credit: Walter Zerla/Getty Images)

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from article Environmental management

Without proper environmental management, economic and industrial development often lead to environmental pollution, especially in urban environments. (Credit: Simon Alvinge/123RF)

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from article Bioassay

In conducting bioassays, researchers often employ laboratory culture tests, which use, for example, bacteria cultured in a petri dish (usually to model an effect on the organism of interest or on some basic cellular function). (Credit:…

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from article Surfactant

Foam blankets typically contain less than 1% surfactant to produce a stable foam that blocks oxygen for fire suppression. (Credit: U.S. Navy)

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from article Open channel

Types of open-channel flow. The inverted triangles denote the free surface of the flow. (a) Unsteady flow. (b) Steady, uniform flow. (c) Steady, gradually varied flow (GVF) and steady, rapidly varied flow (RVF). (After T. W. Sturm, Open Channel…

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from article Osage orange

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from article Integrated optics

Optical waveguide. (a) Optical intensity of the fundamental guided mode. (b) Ray picture of the guided mode.

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from article Integrated optics

Two-dimensional transverse waveguiding. (a) Rib waveguide. (b) Diffused channel guide.

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from article Integrated optics

Prism input coupling and grating output coupling. With the ray directions reversed, the grating acts as an input coupler and the prism as an output coupler.

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from article Integrated optics

A “4 by 4” directional coupler switch.

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from article Integrated optics

Top view of an integrated optics spectrum analyzer.

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from article Integrated optics

A wavelength-division-multiplexed transmitter chip. DFB indicates distributed feedback.

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from article Torsion bar

Diagram of a torsion bar.

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from article Environmental engineering

U.S. Environmental Protection Agency team monitoring water quality in the Animas River, Colorado, USA, 25 days after the August 5, 2015 accidental release of 3 million gallons of mine waste into the river. (EPA)

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from article Environmental engineering

The interior of a drinking water treatment plant. (EPA Photo by Eric Vance)

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from article Environmental engineering

Testing a suspected hazardous site for chemical and biological agents. (EPA Photo by Eric Vance)

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from article Indoor air pollution

Aerosol spray paints are sources of air pollutants known as volatile organic compounds and particulate matter. (Credit: YAY Media AS/Alamy)

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from article Indoor air pollution

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from article Indoor air pollution

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from article Floating bridge

Albert D. Rosellini Bridge, Seattle, Washington. (Courtesy of Washington Department of Transportation)

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from article Magnolia

Flowers and leaves of the southern magnolia (Magnolia grandiflora). (Photo courtesy of Forest and Kim Starr)

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from article Dental caries

The disease of dental caries or tooth decay is largely preventable. Bacteria colonize the tooth surface and often produce sufficient acids to demineralize the tooth's enamel. Then, dental plaque can build up on the tooth's surface, creating…

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from article Dental caries

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from article Hackberry

Hackberry (Celtis occidentalis). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)

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from article Vacuum pump

Comparison of the degree of vacuum attained by important types of vacuum pumps.

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from article Vacuum pump

Chief components of rotary oil-seal pump.

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from article Vacuum pump

Diagram of the water aspirator pump. Utilization of (a) water and (b) steam.

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from article Vacuum pump

Main operating features of diffusion pump.

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from article Vacuum pump

Size comparison of two diffusion pumps.

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from article Vacuum pump

The principal features of an ion pump.

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from article Platinum

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from article Medical control systems

Diagram of selected portions of the human motor control system. (After G. L. Gottlieb, D. M. Corcos, and G. C. Agarwal, Strategies for the control of voluntary movements with one mechanical degree of freedom, Behav. Brain Sci., 12:189–250, 1989)

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from article Medical control systems

Electric hand, a myoelectric prosthesis. (a) Two views of the hand, 2.5 in. (6 cm) across the knuckles, with the cover removed in one view to show the electric motor drive circuit. (b) Child using the electric hand. (Hugh Steeper Ltd.)

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from article Medical control systems

Hybrid control system using both functional electrical stimulation and orthoses. (a) Hierarchical control scheme. (b) Braces in use. (c) Detail of leg brace. (After Y. Kim and F. A. Spelman, eds., Images of the Twenty-First Century: Proceedings of…

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from article Medical control systems

Autoclavable pacemaker with a lithium silver vanadium pentoxide battery. (After W. Greatbatch, Pacemaker power sources, IEEE Eng. Med. Biol. Mag., 3(2):15–19, June 1984)

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from article Medical control systems

Automatic implantable cardioverter defibrillator (AICD) system with pulse generator, leads, and external programmer. (S. Nisam, Cardiac Pacemakers, Inc.)

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from article Highway engineering

Typical (a) plan view and (b) profile view of a highway section.

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from article Highway engineering

Typical highway cross section. IS, inside shoulder; OS, outside shoulder.

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from article Highway engineering

Cross sections of (a) typical flexible pavement and (b) typical rigid pavement. Some designs include a subbase layer, between the base and subgrade.

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from article Computer-aided circuit design

Four phases in creating a microelectronic chip. (a) Design. (b) Fabrication. (c) Testing. (d) Packaging. (After G. De Micheli, Synthesis and Optimization of Digital Circuits, McGraw-Hill, 1994)

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from article Computer-aided circuit design

Three abstraction levels of a circuit representation. (a) Architectural level. (b) Logic level. (c) Geometrical level. (After G. De Micheli, Synthesis and Optimization of Digital Circuits, McGraw-Hill, 1994)

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8,446 results

3D Floor Plan

3D Skull Candy Mold

3D Spur Gear

3D Terrain Map

3x3x3 LED Cube

Arduino Oscilloscope

Jumbo Foam Glider

Levitation Machine

Light and Temperature Logger

Pulse Generator Circuits

Text-Controlled RGB LED

Tumblewing Walkalong Glider

Ultralight Foam Glider

Wind Lantern

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