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A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.

Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.

Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.

Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.

Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

Basic components of an electrochemical cell.

Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.

Vegetation profile of a temperate deciduous forest.

Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.

Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

Rising air in an unstable atmosphere

Bohr atomic model

Electron shell

The Hardy-Weinberg Law applied to two alleles.

Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.

Earth's prebiotic and modern atmosphere

A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.

Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.

Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.

Polar covalent bond

The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.

Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.

Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.

Fission bomb designs

Thermonuclear warhead

Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.

Typical gasoline engine lubrication system.

An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.

Coriolis force

Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.

Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.

Vegetation profile of a desert.

Cross section of a typical bomb calorimeter.

Diagram of a mammalian muscle spindle.

The stages in the evolution of a wave (frontal) cyclone.

The components of a scanning electron microscope (SEM).

The components of a transmission electron microscope (TEM).

The diffusion of water across a semipermeable membrane.

The diffusion of potassium cations across a semipermeable membrane.

A grid-connected solar cell system.

Schematic drawing of the structure of a typical bacterial cell of the bacillus type.

The steps involved in the engineering of a recombinant DNA molecule.

Diagram of a human uterus during the fourth month of pregnancy.

Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.

General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.

Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Proton exchange membrane (PEM) fuel cell.

Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.

Displacements in the Earth in four types of free vibrations.

Vegetation profile of tropical mountain lands.

The process of cell division by mitosis.

Stages in the process of meiosis, cell division among sexually reproducing organisms.

Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.

The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

Transverse section of an artery.

Human arterial supply and venous drainage of the organs.

Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.

Horizontal divergence and convergence patterns associated with the polar-front jet.

The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.

Seismic ray types in Earth's interior from earthquake at F.

Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.

The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.

Changes in ion permeance underlying the action potential.

Theoretical depiction of the movement of tectonic plates across Earth's surface.

Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.

Differentiation of the external genitalia in the human embryo and fetus.

The analysis of sound frequencies by the basilar membrane.

Types of faulting in tectonic earthquakes.

The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.

Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.

Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.

In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.

Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.

A cutaway view shows how light passes through the lenses and prisms of binoculars.

Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.

Diagram of an artificial pacemaker

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Vegetation profile of a grassland.

Wet scrubber using a limestone slurry to remove sulfur dioxide from flue gas.

The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.

U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.

Height of space from Earth, illustration

The weather model of meteorologist Edward Lorenz.

The artery wall and the ultrastructure of the smooth muscle cells within it.

The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.

Female reproductive system, artwork

Gender characteristics, artwork

Muscle structure, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Cardiac stress test, artwork

Cutaway view of an alkaline-manganese dioxide power cell.

Typical gasoline engine cooling system.

Valley and mountain breezes

Viral transfer of bacterial DNA, artwork

Tokamak fusion reactor, illustration

Compton effect

Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.

Comparison of a normal heart to one with a ventricular septal defect

Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect

The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.

Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.

Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.

Circuit breaker, diagram

Residual current circuit breaker, diagram

Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

Electromagnet, illustration

Cross section of a crystal microphone.

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Osteoarthritis of the knee, artwork

A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Tokamak nuclear fusion reactor, illustration

Tokamak nuclear fusion reactor, illustration

Tokamak nuclear fusion reactor, illustration

Tokamak nuclear fusion reactor, illustration

Tokamak nuclear fusion reactor, illustration

Tokamak nuclear fusion reactor, illustration

Ionic bond

Speedometer

Spring balance

Magnetic field around a bar magnet, illustration

Magnetic field round a solenoid, illustration

Wormhole through hyperspace, artwork

Male urogenital system, artwork

Annual temperature and precipitation patterns for several locations with different climatic conditions.

Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.

Magnetic field of electromagnetic coil and core

Magnetic field of electromagnetic coil and core

Magnetic field of electromagnetic coil and core

Drinking through a straw, illustration

Drinking through a straw, illustration

Pluto and the Kuiper belt

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

When monochromatic light passing through a single slit illuminates a screen, a characteristic diffraction pattern is observed.

The mechanical components of a compound microscope.

Image formation in a microscope, according to the Abbe theory.

When monochromatic light passes through two narrow slits to illuminate a screen, it creates a pattern of bright and dark bands.

A cross section of Earth's outer layers, from the crust through the lower mantle.

アイコンのセット

アイコンのセット

Electromagnet, illustration

Electromagnet, illustration

Electric bell mechanism, diagram

Electric bell mechanism, diagram

Spherical tokamak, illustration

Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.

Correct computer use position, artwork

Convex and concave lenses, diagram

Mechanism of enzyme action, illustration

Pelvic inflammatory disease, artwork

Pleural effusion treatment, artwork

Male Down's syndrome karyotype, artwork

Spina bifida, artwork

Common wart, artwork

Laser eye surgery, artwork

Laser eye surgery, artwork

Human stomach, artwork

Human olfactory region, artwork

Human olfactory region, artwork

Human olfactory system, artwork

Liver and pancreas, artwork

Endometrial cancer, artwork

Human sex hormone production sites

Compression fracture, artwork

Dupuytren's contracture,artwork

Male urinary system, artwork

Kidney stone, artwork

Brain haemorrhage, artwork

Tear production, artwork

Shoulder joint, artwork

Situs inversus, artwork

Brain and spinal cord, artwork

Cervical conization, artwork

Female urinary system, artwork