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

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

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

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

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

Typical gasoline engine cooling system.

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

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

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

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

Rising air in an unstable atmosphere

Vegetation profile of a temperate deciduous forest.

Typical gasoline engine lubrication system.

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

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

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.

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

Cutaway view of an alkaline-manganese dioxide power cell.

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

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

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

Electron shell

Basic components of an electrochemical cell.

The Hardy-Weinberg Law applied to two alleles.

Fission bomb designs

Thermonuclear warhead

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

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

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

Cross section of a typical bomb calorimeter.

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

Transverse section of an artery.

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

Types of faulting in tectonic earthquakes.

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

Earth's prebiotic and modern atmosphere

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.

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

Bohr atomic model

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

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

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

Displacements in the Earth in four types of free vibrations.

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

The analysis of sound frequencies by the basilar membrane.

Diagram of a mammalian muscle spindle.

The components of a scanning electron microscope (SEM).

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

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

Coriolis force

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

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

Vegetation profile of a grassland.

Polar covalent bond

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

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

Proton exchange membrane (PEM) fuel cell.

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

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.

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.

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

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.

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.

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

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

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.

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

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

The diffusion of water across a semipermeable membrane.

A grid-connected solar cell system.

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

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

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

Diagram of an artificial pacemaker

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

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

The components of a transmission electron microscope (TEM).

The diffusion of potassium cations across a semipermeable membrane.

Changes in ion permeance underlying the action potential.

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

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

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

Speedometer

Spring balance

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

Muscle structure, artwork

Compton effect

The relationship between hot springs and epithermal veins.

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Female reproductive system, artwork

Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits.

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.

The weather model of meteorologist Edward Lorenz.

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

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

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

Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Moon interior

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

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

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

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

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

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

Cardiac stress test, artwork

Duplex engine distribution, illustration

Benz engine distribution, illustration

Ionic bond

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

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

Male urogenital system, artwork

Cross section of a crystal microphone.

Pluto and the Kuiper belt

Valley and mountain breezes

Operating principle of a parallel-flow heat exchanger.

Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.

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

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

The first reduction for an n-person voting game theory, illustrating the strategies least suitable for each participant.

Mechanism of enzyme action, illustration

Human muscle structure, artwork

Animal cell structure

Laser eye surgery, artwork

Laser eye surgery, artwork

Human olfactory region, artwork

Human olfactory region, artwork

Endometrial cancer, artwork

Brain haemorrhage, artwork

Shoulder joint, artwork

Cervical conization, artwork

Female urinary system, artwork

Asthma pathology, artwork

Eye anatomy,artwork

Kidney anatomy, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Bone structure, artwork

Breast anatomy, artwork

Vascular disease progression, artwork

Gender characteristics, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Chemical composition of nicotine, conceptual image

Goose barnacle anatomy, artwork

Mechanics of respiration, artwork

Blood alcohol concentration

Blood alcohol concentration

The mechanical components of a compound microscope.

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

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

Asteroid distribution

Venus's middle and lower atmosphere

Pluto-Charon mutual eclipses

Jupiter's atmosphere

Near-Earth objects

Uranus's orbit

Nuclear blast and radiation effects

Mass spectrometer and data chart, illustration

Gas engine piston, illustration

Renault car ignition, illustration

Van Allen radiation belt

Viral transfer of bacterial DNA, artwork

Layers of the ionosphere

The Hawk-Dove model of game theory, illustrating the costs and benefits of fighting over resources.

Structure of the Earth, illustration

歯の断面図　正常

Skull fracture, artwork

Internal diagram of penis

Pancreas diagram

Part of the elliptic paraboloid z = x2 + y2 which can be generated by rotating the parabola z = x2 (or z = y2) about the z-axis.

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Artist's impression of the Oort Cloud

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Internal structure of Earth, illustration