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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.

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

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

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

Typical gasoline engine lubrication system.

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

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

Typical gasoline engine cooling system.

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

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

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

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

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

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

Cutaway view of an alkaline-manganese dioxide power cell.

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

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

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

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

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

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

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.

Basic components of an electrochemical cell.

Muscle structure, artwork

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

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

Fission bomb designs

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

Compton effect

Vegetation profile of a grassland.

Gas engine piston, illustration

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.

Displacements in the Earth in four types of free vibrations.

Rising air in an unstable atmosphere

Coriolis force

Bohr atomic model

Electron shell

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

Vegetation profile of a temperate deciduous forest.

Types of faulting in tectonic earthquakes.

The Hardy-Weinberg Law applied to two alleles.

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

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

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

A grid-connected solar cell system.

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

Thermonuclear warhead

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

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

The process of cell division by mitosis.

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

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.

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

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

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

Polar covalent bond

Ionic bond

Chemical composition of nicotine, conceptual image

Mechanism of enzyme action, illustration

Human muscle structure, artwork

Animal cell structure

Goose barnacle anatomy, artwork

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

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

Cross section of a typical bomb calorimeter.

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.

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

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

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.

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

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

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

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

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 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.

Changes in ion permeance underlying the action potential.

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

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

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

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

The analysis of sound frequencies by the basilar membrane.

Diagram of a mammalian muscle spindle.

Proxima Centauri interstellar spacecraft, illustration

Piston engine and oil, artwork

Piston engine, artwork

Piston engine, artwork

Golden machine cogs making up abstract business concept

Diagram of an artificial pacemaker

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

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.

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

Locomotive engine, illustration

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

Supercavitating torpedo, illustration

Supercavitating torpedo, illustration

Compression fracture, artwork

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Chromatin remodelling factor complex

Oxalate decarboxylase specificity switch

Stroke causes, artwork

Atmospheric pressure glass trick, illustration

Atmospheric pressure glass trick, illustration

Electric motor and circuit symbol, illustration

Pressure transmission in liquids, illustration

Pressure transmission in liquids, illustration

Car disc brake system, illustration

Car disc brake system, illustration

Hydraulic lift, illustration

Hydraulic lift, illustration

Hydraulic press, illustration

Marey's sphygmograph, 19th century illustration

Thought process, conceptual artwork

Phospholipid bilayer structure, illustration

足つぼ名称図解

足つぼ名称図解

足つぼ名称図解

足つぼ名称図解

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

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.

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

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

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

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

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Drinking through a straw, illustration

Drinking through a straw, illustration

Wormhole through hyperspace, artwork

Male urogenital system, artwork

Female reproductive system, artwork

Gender characteristics, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Cardiac stress test, artwork

DNA replication, illustration

Curcumin molecule

Folic acid vitamin B9 molecule

Vitamin A molecule

Enzyme reaction stages, illustration

DNA molecular structure, illustration

Angkor, Cambodia,illustration

SARS-CoV-2 frameshifting pseudoknot RNA, molecular model

Kidney stone, artwork

Narrowed blood vessel, artwork

Anatomical terms, artwork

Male anatomy, artwork

Male anatomy, artwork

Cardiovascular system, artwork

Motor effect, illustration

Electric cell and circuit symbol, illustration

Electric lamp and circuit symbol, illustration

Circuit board, illustration

Petrol engine, illustration

Viral transfer of bacterial DNA, artwork

Elements of a typical Prony brake, which develops mechanical friction on the periphery of a rotating pulley.

Jacquard perforating machine blueprint, illustration

Lathe blueprint, illustration

Locomotive engine, illustration

Locomotive engine, illustration

Sewing machine blueprint, illustration

Sewing machine blueprint, illustration

Duplex engine distribution, illustration

Benz engine distribution, illustration

Renault car ignition, illustration

Bond formation in water molecule, illustration

Engineering, conceptual illustration

Jet engine, cutaway artwork

Repeating industrial design that makes a seamless background

Industrial gear tile that repeats seamlessly without a join

Car components, illustration

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

Pressure unit conversion table, illustration

Trieste bathyscaphe, 1963 illustration