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Each point on the Riemann sphere corresponds to a point on the plane. The ray tangent to the north pole corresponds to infinity.

The normal, or perpendicular, at each point of a surface defines the corresponding tangent plane, and vice versa.

Double refraction showing two rays emerging when a single light ray strikes a calcite crystal at a right angle to one face.

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

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

If a saddlepoint does not exist for a payoff matrix, a probabilistic strategy is optimal to maximize expected (average) rewards.

The Hardy-Weinberg Law applied to two alleles.

The rocker, or cradle, form of placer mining enabled one miner to handle more material than by simple panning.

Electron shell

Basic components of an electrochemical cell.

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

The brewing process, which turns barley and hops into the alcoholic beverage of beer.

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

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

Several points are labeled in a two-dimensional graph, known as the Cartesian plane.

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.

Rising air in an unstable atmosphere

Coriolis force

Vegetation profile of a temperate deciduous forest.

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

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

Point mutations. How changes in one nucleic acid of a triplet lead to different amino acids in the protein.

Red amrble icon with a drop shadow

Ble and silver internet icon buttone with metalic surround

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

The figure shows part of the graph of the polynomial equation y = 3x4 - 16x3 + 6x2 + 24x + 1.

Diagram of the operating process of a laser printer.

Diagram of the operating process of an inkjet printer.

The three families of conic sections (ellipse, parabola, and hyperbola) result from intersecting a plane with a double cone.

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

A saddlepoint, or entry, in a payoff matrix at which the expected gain of each participant has the highest guaranteed payoff.

Earth's prebiotic and modern atmosphere

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

Types of faulting in tectonic earthquakes.

An active-matrix thin-film transistor (TFT) liquid crystal display. A TFT is associated with each pixel of the display screen.

手書きペン画風クリップアート・文字セット

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

The circulation of nitrogen in various forms through nature, a process essential to life on Earth.

Displacements in the Earth in four types of free vibrations.

Representation of an ellipsoid, a closed surface such that its intersection with any plane will produce an ellipse or a circle.

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

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

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

In variable-sum games each payoff depends on both players' actions, so each matrix entry lists two payoffs, one for each player.

Can the eight ball tell the future maybe this one can

天使とアルファベットH

Glycolysis, the dissolution of sugar, is carried out in the cytoplasm of cells.

Icon hand saw on white circle with a long shadow

HAPPY

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

The existence of parallel magnetic anomalies in the oceanic crust corroborates the hypothesis of seafloor spreading .

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

The process of cell division by mitosis.

The mammalian pituitary gland, showing the anterior lobe (adenohypophysis) and posterior lobe (neurohypophysis).

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

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

Human arterial supply and venous drainage of the organs.

Diagram demonstrating the progression of an arterial embolism

The diffusion of water across a semipermeable membrane.

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

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

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

Electrocardiogram of the alternating contractions during one heartbeat and a diagram of the heart's impulse-conducting system.

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

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

Baghouse employing an array of fabric bags for filtering the airstream.

The prisoners' dilemma in game theory demonstrates how communication among participants can drastically alter their strategy.

silhouette of the cancer on white background

Cyclone collectors remove relatively coarse particulates from the air. Small cyclones are often installed on mobile sources.

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

手書きペン画風POP向けクリップアート・文字セット

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

Polar covalent bond

The life cycle of a malaria parasite, from its stages within the body of a mosquito to those within the body of a human.

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

Proton exchange membrane (PEM) fuel cell.

Digital composite backgrounds

双方向の矢印　2個

ペンで描いたようなカラフル矢印のセット

Proof that the area of a triangle = 1/2 base x height.

Four icons in a row

スイカ

Close up of globe

Close up of globe rounded with arrow sign

Compound pier

Basic features of a modern road bicycle.

Electrostatic precipitator, a common particle collection device at fossil-fuel power-generating stations.

Operating principle of a parallel-flow heat exchanger.

Schematic diagram of a fluidized-bed combustion boiler.

Three models of hyperbolic geometry: the Klein-Beltrami model, the Poincare disk model, and the Poincare upper half-plane model.

天使とアルファベットN

コミック風ふきだしセット

palette and paintbrush on white circle with a long shadow

Bowling icon on white circle with a long shadow

ギリシャ文字の変異ウイルス

Proof, attributed to the Pythagoreans, that the sum of the angles in a triangle is 180 degrees.

Delaware state flag

Cross section of a single-lens reflex (SLR) camera with a flip mirror.

Early 19th-century whaleboat

Cross-section showing component parts of arteries and veins

Diagram illustrating varicose veins

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

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

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.

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

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

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

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

Digital composite backgrounds

ペンで描いたようなカラフルふきだし・アイコンセット

アイコンのセット

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

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

Coffee beans

Coffee beans

Coffee beans

Story of a cartoon bomb at different stages with shadow

吹き出し セット2

禁煙

コミック風の電球クリップアート

若い男性 外国人

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

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

Food and drinks icon

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

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

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

hand of the person shows fig

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

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

vector silhouette of the hand on white background

vector silhouette of the hand on white background

ギリシャ文字の変異ウイルス

White sphere, illustration

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

Abstract green spheres, illustration

Abstract spheres, illustration

Bohr atomic model

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

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

アイコンのセット

アイコンのセット

シンプルな吹き出し素材のセット

シンプルな吹き出し素材のセット

シンプルな吹き出し素材のセット

Representation of a girl holding arrow sign

Representation of a boy swinging around signal

矢印のアイコンのセット

矢印のアイコンのセット

Water-and-ink painting

Buckminsterfullerene molecule (C60), illustration

Buckminsterfullerene molecule (C60), illustration

看板のセット

クラウドサーバー　コンセプト　アイコン

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

Digital composite backgrounds

Digital composite backgrounds

カーブした上向き矢印

カーブした上向き矢印

Icon on white circle with a long shadow

Icon on white circle with a long shadow

Ionic bond

Weathered collection of alphabet and numeric buttons that have been adged

天使とアルファべットL

天使とアルファベットM

天使とアルファベットO

天使とアルファベットP

天使とアルファベットT

天使とアルファベットU

天使とアルファベットX

Liu Hui's "Tangram" proof that the sum of the squares on the sides of a right triangle equals the square on the hypotenuse.

イラストイメージ

Thales of Miletus proof that for any chord AB in a circle, all of the angles subtended by points on the same semiarc are equal.

An example of a hyperbolic paraboloid. The figure shows part of the hyperbolic paraboloid x2/a2 - y2/b2 = 2cz.

A demonstration of the fundamental theorem of similarity, showing that small and large triangles are similar.

ball icon

ball icon

Illustration of the three basic theorems that triangles are congruent: side-angle-side, angle-side-angle, and side-side-side.

球体内でうごめく沢山の矢印

An annular strip (region between two concentric circles) cut and bent into a helical strake following the contour of a cylinder.

OKサイン

Composite - Invite (SI)

Mouse icon

Mouse icon

Icon Mouse on white circle with a long shadow

Icon Mouse on white circle with a long shadow

イラストイメージ

ＳＡＬＥの立体文字

ＳＡＬＥの立体文字

ＳＡＬＥの立体文字

コンセントのイラスト　差し込み口

新品と古い電源タップのイラスト

天使とアルファベットA

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天使とアルファベットC

天使とアルファベットD