Tuesday, June 24, 2014

KARACHI

Karachi

Karachi
ڪراچي
کراچی
Metropolis
Clockwise from top: Karachi Skyline, KPT HQ, PRC Towers & PNSC, Karachi Market, Manora Lighthouse, Nagan Interchange and MA Jinnah Tomb.
Clockwise from top:
Karachi SkylineKPT HQPRC Towers & PNSCKarachi MarketManora LighthouseNagan Interchange and MA Jinnah Tomb.
Official seal of Karachi
Seal
Nickname(s): The Gateway to Pakistan, The City of Bright Lights, Mini Pakistan, Capital of Sindh
Karachi is located in Sindh
Karachi
Karachi
Location of Karachi in Sindh and in Pakistan
Coordinates: 24°51′36″N 67°0′36″ECoordinates24°51′36″N 67°0′36″E
Country Pakistan
ProvinceSindh
Metropolitan Corporation2011
City CouncilCity Complex, Gulshan-e-Iqbal Town
Districts [2]
Government[5]
 • TypeMetropolitan City
 • City AdministratorM. Hussain Syed[3]
 • Municipal commissionerMatanat Ali Khan[4]
Area[6]
 • Total3,527 km2 (1,362 sq mi)
Elevation8 m (26 ft)
Population (2013)
 • Total23,500,000[1]
 • Rank1st (Pakistan)3rd (World)
DemonymKarachiite
Time zonePST (UTC+05:00)
Postal codes74XXX – 75XXX
Dialling code+9221-XXXX XXXX
Websitewww.kmc.gos.pk
Karachi (SindhiڪراچيUrduکراچی‎ / ALA-LCKarācī IPA: [kəˈrɑːˌtʃi] ( )) is the largest and most populous metropolitan city of Pakistanand its main seaport and financial centre, as well as the capital of Sindhprovince. The city has an estimated population of over 23.5 million people as of 2013,[1] and an area of approximately 3,527 km2 (1,362 sq mi),[7][8]resulting in a density of more than 6,000 people per square kilometre (15,500 per square mile).[9] Karachi is the 3rd-largest city in the world by population within city limits,[10] the 7th largest[11][12] urban agglomeration in the world and the largest city in the Muslim world.[13] It is Pakistan's centre of banking, industry, economic activity and trade and is home to Pakistan's largest corporations, including those involved in textiles, shipping,automotive industry, entertainment, the arts, fashion, advertising, publishing, software development and medical research. The city is a hub of higher education in South Asia and the Muslim world.[14]
Karachi is ranked as a beta world city.[15][16] It was the capital of Pakistanuntil Islamabad was constructed as a capital to spread development evenly across the country and to prevent it from being concentrated in Karachi.[17]Karachi is the location of the Port of Karachi and Port Bin Qasim, two of the region's largest and busiest ports. After the independence of Pakistan, the city population increased dramatically when hundreds of thousands ofMuslim Muhajirs from India fleeing from anti-Muslim pograms and from other parts of South Asia came to settle in Karachi.[18]
The city is located on the Arabian Sea coastline. It is known as the Uroos ul Bilaad "City of Lights"[19][20] and "The Bride of the Cities" for its liveliness,[citation needed] and the "City of the Quaid", having been the birth and burial place of Quaid-e-Azam, the Great Leader, Muhammad Ali Jinnah, the founder of Pakistan, who made the city his home after Pakistan'sindependence from the British Raj on 14 August 1947.

History

Solar panel

Solar panel

This article is about photovoltaic solar modules. For other types of solar modules, see Solar_energy#Others.

A solar array composed of a solar panel with 24 solar modules in rural Mongolia
A solar photovoltaic module is composed of individual PV cells. This crystalline-silicon module comprises 4 solar cells and has an aluminum frame and glass on the front.
Solar modules on the International Space Station
A half-built homemade solar module, made from individual cells soldered together
solar panel is a set of solar photovoltaic modules electrically connected and mounted on a supporting structure. A photovoltaic module is a packaged, connected assembly of solar cells. The solar panel can be used as a component of a larger photovoltaic system to generate and supply electricity in commercial and residential applications. Each module is rated by its DC output power under standard test conditions (STC), and typically ranges from 100 to 320 watts. The efficiency of a module determines the area of a module given the same rated output - an 8% efficient 230 watt module will have twice the area of a 16% efficient 230 watt module. A single solar module can produce only a limited amount of power; most installations contain multiple modules. A photovoltaic system typically includes a panel or an array of solar modules, an inverter, and sometimes a battery and/or solar trackerand interconnection wiring.

Solar System

Solar System

This article is about the Sun and its planetary system. For other similar systems, see Star system and Planetary system.
Solar System
The Solar System. Sizes but not distances to scale.
The Sun and planets of the Solar System. Sizes but not distances are to scale.
Age4.568 billion years
Location
System mass1.0014 Solar masses
Nearest star
Nearest knownplanetary systemAlpha Centauri system  (4.37 ly)
Planetary system
Semi-major axis of outer planet(Neptune)30.10 AU  (4.503 billion km)
Distance to Kuiper cliff50 AU
Populations
Stars1  (Sun)
Planets
Known dwarf planets
Possibly several hundred;[1]
five currently recognized by the IAU
Known natural satellites
427
Known minor planets644,275  (as of 2014-06-18)[4]
Known comets3,272  (as of 2014-06-18)[4]
Identified rounded satellites19
Orbit about Galactic Center
Invariable-to-galactic plane inclination60.19°8  (ecliptic)
Distance to Galactic Center27,000 ± 1,000 ly
Orbital speed220 km/s
Orbital period225–250 Myr
Star-related properties
Spectral typeG2V
Frost line≈5 AU[5]
Distance toheliopause≈120 AU
Hill sphere radius≈1–2 ly
The Solar System[a] consists of the Sun and the objects that orbitit, whether they orbit it directly or by orbiting other objects that orbit it directly.[b] Of those objects that orbit the Sun directly, the largest eight are the planets[c] that form the planetary systemaround it, while the remainder are significantly smaller objects, such as dwarf planets and small Solar System bodies (SSSBs)such as comets and asteroids.[d]
The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets,MercuryVenusEarth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, called the gas giants, are substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, Uranusand Neptune, are composed largely of substances with relatively high melting points (compared with hydrogen and helium), calledices, such as water, ammonia and methane, and are often referred to separately as "ice giants". All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic plane.

Solar energy

Solar energy

Part of the 354 MW SEGS solar complex in northern San Bernardino County, California.
Solar energy, radiant light and heat from the sun, is harnessed using a range of ever-evolving technologies such as solar heatingsolar photovoltaicssolar thermal electricitysolar architecture and artificial photosynthesis.[1][2]
Solar technologies are broadly characterized as either passive solar oractive solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.

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