# Portal:Infrastructure

Infrastructure Portal
 Welcome to Wikipedia's infrastructure portal, your gateway to the subject of infrastructure and its monumental importance for everyday society and the economy.

## Introduction

Infrastructure is the fundamental facilities and systems serving a country, city, or other area, including the services and facilities necessary for its economy to function. Infrastructure is composed of public and private physical improvements such as roads, railways, bridges, tunnels, water supply, sewers, electrical grids, and telecommunications (including Internet connectivity and broadband speeds). In general, it has also been defined as "the physical components of interrelated systems providing commodities and services essential to enable, sustain, or enhance societal living conditions". There are two general types of ways to view infrastructure, hard or soft. Hard infrastructure refers to the physical networks necessary for the functioning of a modern industry. This includes roads, bridges, railways, etc. Soft infrastructure refers to all the institutions that maintain the economic, health, social, and cultural standards of a country. This includes educational programs, official statistics, parks and recreational facilities, law enforcement agencies, and emergency services.

The word infrastructure has been used in French since 1875 and in English since 1887, originally meaning "The installations that form the basis for any operation or system". The word was imported from French, where it was already used for establishing a roadbed of substrate material, required before railroad tracks or constructed pavement could be laid on top of it. The word is a combination of the Latin prefix "infra", meaning "below" as many of these constructions are underground, for example, tunnels, water and gas systems, and railways and the French word "structure" (derived from the Latin word "structura"). The army use of the term achieved currency in the United States after the formation of NATO in the 1940s, and by 1970 was adopted by urban planners in its modern civilian sense.

## Selected article

An airport is a location where aircraft such as fixed-wing aircraft, helicopters, and blimps take off and land. Aircraft may be stored or maintained at an airport. An airport consists of at least one surface such as a runway for a plane to take off and land, a helipad, or water for takeoffs and landings, and often includes buildings such as control towers, hangars and terminal buildings.

Larger airports may have fixed base operator services, seaplane docks and ramps, air traffic control, passenger facilities such as restaurants and lounges, and emergency services. A military airport is known as an airbase or air station. The terms aerodrome, airdrome, airfield, and airstrip may also be used to refer to airports, and the terms heliport, seaplane base, and STOLport refer to airports dedicated exclusively to helicopters, seaplanes, or short take-off and landing aircraft.

Smaller or less-developed airports—which represent the vast majority—often have a single runway shorter than 1,000 m (3,300 ft). Larger airports for airline flights generally have paved runways 2,000 m (6,600 ft) or longer. Many small airports have dirt, grass, or gravel runways, rather than asphalt or concrete. Read more...

## Diagrams

 Graphical phases in the life cycle of a facility Public Vs. Private Provision Infrastructure Systems Cash Flow

## Selected biography

Karl Friedrich Benz, (November 25, 1844 – April 4, 1929) was a German engine designer and car engineer, generally regarded as the inventor of the gasoline-powered car, and together with Bertha Benz pioneering founder of the automobile manufacturer Mercedes-Benz. Other German contemporaries, Gottlieb Daimler and Wilhelm Maybach working as partners, also worked on similar types of inventions, without knowledge of the work of the other, but Benz patented his work first and, after that, patented all of the processes that made the internal combustion engine feasible for use in cars. In 1886 Benz was granted a patent for his first car.

Despite previous business misfortunes, Karl Benz led in the development of new engines in the early factory he and his wife owned. To get more revenues, in 1878 he began to work on new patents. First, he concentrated all his efforts on creating a reliable gas two-stroke engine. Benz finished his two-stroke engine on December 31, 1878, New Year's Eve, and was granted a patent for it in 1879. Karl Benz showed his real genius, however, through his successive inventions registered while designing what would become the production standard for his two-stroke engine. Benz soon patented the speed regulation system, the ignition using white power sparks with battery, the spark plug, the carburetor, the clutch, the gear shift, and the water radiator.

## Economic Analysis

${\displaystyle \scriptstyle ratio={\frac {PV(B_{2})-PV(B_{1})}{PV(C_{2})-PV(C_{1})}}}$
${\displaystyle \scriptstyle EAC={\frac {NPV}{A_{t,r}}}}$
${\displaystyle \scriptstyle FV=PV\cdot (1+i)^{n}}$
${\displaystyle \scriptstyle NPV=\sum _{n=0}^{N}{\frac {C_{n}}{(1+r)^{n}}}=0}$
${\displaystyle \scriptstyle \mathrm {PV} ={\frac {FV}{(1+i)^{n}}}\,}$
${\displaystyle \scriptstyle ROI={\frac {Profit}{Investment}}\ }$

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