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History Of Science And Technology In India
The history of science and technology on the Indian subcontinent begins with the prehistoric human activity of the Indus Valley Civilisation to the early Indian states and empires. Prehistory By 5500 BCE a number of sites similar to Mehrgarh (modern-day Pakistan) had appeared, forming the basis of later chalcolithic cultures. The inhabitants of these sites maintained trading relations with Central Asia and the Near East.Kenoyer, 230 Irrigation was developed in the Indus Valley Civilization by around 4500 BCE. The size and prosperity of the Indus civilization grew as a result of this innovation, which eventually led to more planned settlements making use of drainage and sewerage.Rodda & Ubertini, 279 Sophisticated irrigation and water storage systems were developed by the Indus Valley Civilization, including artificial reservoirs at Girnar dated to 3000 BCE, and an early canal irrigation system from c. 2600 BCE. Cotton was cultivated in the region by the 5th窶 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technical Standard
A technical standard is an established norm or requirement for a repeatable technical task which is applied to a common and repeated use of rules, conditions, guidelines or characteristics for products or related processes and production methods, and related management systems practices. A technical standard includes definition of terms; classification of components; delineation of procedures; specification of dimensions, materials, performance, designs, or operations; measurement of quality and quantity in describing materials, processes, products, systems, services, or practices; test methods and sampling procedures; or descriptions of fit and measurements of size or strength. It is usually a formal document that establishes uniform engineering or technical criteria, methods, processes, and practices. In contrast, a custom, convention, company product, corporate standard, and so forth that becomes generally accepted and dominant is often called a ''de facto'' standard. A techni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hearth
A hearth () is the place in a home where a fire is or was traditionally kept for home heating and for cooking, usually constituted by at least a horizontal hearthstone and often enclosed to varying degrees by any combination of reredos (a low, partial wall behind a hearth), fireplace, oven, smoke hood, or chimney. Hearths are usually composed of masonry such as brick or stone. For centuries, the hearth was such an integral part of a home, usually its central and most important feature, that the concept has been generalized to refer to a homeplace or household, as in the terms "hearth and home" and "keep the home fires burning". In the modern era, since the advent of central heating, hearths are usually less central to most people's daily life because the heating of the home is instead done by a furnace or a heating stove, and cooking is instead done with a kitchen stove/range (combination cooktop and oven) alongside other home appliances; thus many homes built in the 20t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kalibangan
Kalibangﾄ］ is a town located at on the left or southern banks of the Ghaggar (Ghaggar-Hakra River) in Tehsil Pilibangﾄ］, between Suratgarh and Hanumangarh in Hanumangarh District, Rajasthan, India 205 km. from Bikaner. It is also identified as being established in the triangle of land at the confluence of Drishadvati and Sarasvati Rivers. The prehistoric and pre-Mauryan character of Indus Valley civilization was first identified by Luigi Tessitori at this site. Kalibangan's excavation report was published in its entirety in 2003 by the Archaeological Survey of India, 34 years after the completion of excavations. The report concluded that Kalibangan was a major provincial capital of the Indus Valley Civilization. Kalibangan is distinguished by its unique fire altars and "world's earliest attested ploughed field". It is around 2900 BC that the region of Kalibangan developed into what can be considered a planned city. Indus Valley Civilization The Kalibangan pre-his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oven
upA double oven A ceramic oven An oven is a tool which is used to expose materials to a hot environment. Ovens contain a hollow chamber and provide a means of heating the chamber in a controlled way. In use since antiquity, they have been used to accomplish a wide variety of tasks requiring controlled heating. Because they are used for a variety of purposes, there are many different types of ovens. These types differ depending on their intended purpose and based upon how they generate heat. Ovens are often used for cooking, where they can be used to heat food to a desired temperature. Ovens are also used in the manufacturing of ceramics and pottery; these ovens are sometimes referred to as kilns. Metallurgical furnaces are ovens used in the manufacturing of metals, while glass furnaces are ovens used to produce glass. There are many methods by which different types of ovens produce heat. Some ovens heat materials using the combustion of a fuel, such as wood, coal, or na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceramic
A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain, and brick. The earliest ceramics made by humans were pottery objects (''pots,'' ''vessels or vases'') or figurines made from clay, either by itself or mixed with other materials like silica, hardened and sintered in fire. Later, ceramics were glazed and fired to create smooth, colored surfaces, decreasing porosity through the use of glassy, amorphous ceramic coatings on top of the crystalline ceramic substrates. Ceramics now include domestic, industrial and building products, as well as a wide range of materials developed for use in advanced ceramic engineering, such as in semiconductors. The word "'' ceramic''" comes from the Greek word (), "of pottery" or "for pottery", from (), "potter's clay, tile, pottery". The earliest kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallurgical Furnace
A metallurgical furnace, more commonly referred to as a furnace, is a device used to heat and melt metal ore to remove gangue, primarily in Metal, iron and steel production. The heat energy to fuel a furnace may be supplied directly by fuel combustion, by electricity such as the electric arc furnace, or through induction heating in induction furnaces. There are several different types of furnaces used in metallurgy to work with specific metal and ores. Smelting furnaces Smelting furnaces are used in smelting to extract metal from ore. Smelting furnaces include: * The blast furnace, used to Redox, reduce iron ore to pig iron ** Cold blast ** Hot blast * Steelmaking furnaces, including: ** Puddling furnace ** Reverberatory furnace ** ** Open hearth furnace ** Basic oxygen furnace ** Electric arc furnace ** Electric induction furnace Other furnaces * Furnaces used to remelt metal in Foundry, foundries. * Furnaces used to reheat and Heat treatment, heat treat metal for use in: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kot Bala
Kot Bala (Urdu: ﾚｩﾙ異ｹ ﾘｨﾘｧﾙﾘｧ; Hindi: 爨歩･金､ 爨ｬ爨ｾ爨ｲ爨ｾ), or Balakot (Hindi: 爨ｬ爨ｾ爨ｲ爨ｾ爨歩･金､) is an archaeological site located in Lasbela District, Balochistan, Pakistan. It is near the Makran coast of the Arabian Sea, and goes back to around 4000 BC. The settlement of Balakot precedes the Indus Valley civilization by many centuries. It is located in the interior of the Sonmiani Bay, along the Lasbela coast (the Plain of Las Bela). This site is of importance due to its proximity to the Arabian Sea, and is believed to have been a main harbour, from which the Indus traders sailed to the coasts of the Arabian Peninsula. Excavations The site was excavated by Professor George F. Dales of the University of California, Berkeley in the 1970s, but full details were not published. It is the only site in the region that was professionally excavated. The upper levels of the site belong to Indus Civilization, while the lower levels feature a culture of its own. The arrival ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balakot
Balakot (; ur, ; ) is a town in Mansehra District in the Khyber Pakhtunkhwa province of Pakistan. The town was destroyed during the 2005 Kashmir earthquake, but was later rebuilt with the assistance of the Government of Pakistan and Saudi Public Assistance for Pakistan Earthquake Victims (SPAPEV), a Saudi relief organisation. Balakot also serves as a hub for tourists visiting Northern Areas Geography Balakot is located on the right bank of the Kunhar River. It is almost at two-thirds of the length of river from it its origin at Lake Dharam Sar deep in the Kaghan Valley, before it confluence with Jehlum River. The lower area below Balakot, sometimes referred to as Nainsukh Valley, is temperate while Kaghan Valley above Balakot City is cold enough to turn the whole area to freezing in the winter. Kaghan valley is a pleasant summer destination. Its upper part from Naran upstream lacks the monsoon but the lower part get it well and so is forested. Balakot is now expanding c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrography
Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time, for the primary purpose of safety of navigation and in support of all other marine activities, including economic development, security and defense, scientific research, and environmental protection. History The origins of hydrography lay in the making of charts to aid navigation, by individual mariners as they navigated into new waters. These were usually the private property, even closely held secrets, of individuals who used them for commercial or military advantage. As transoceanic trade and exploration increased, hydrographic surveys started to be carried out as an exercise in their own right, and the commissioning of surveys was increasingly done by governments and special hydrographic offices. National organizations, particularly navies, realized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lothal
Lothal () was one of the southernmost sites of the ancient Indus Valley civilisation, located in the Bhﾄ〕 region of the modern state of Gujarﾄ》. Construction of the city is believed to have begun around 2200 BCE. Archaeological Survey of India (ASI), the official Indian government agency for preservation of ancient monuments, discovered Lothal in 1954. Excavation work in Lothal commenced on 13 February 1955 and continued till 19 May 1960. According to the ASI, Lothal had the world's earliest known dock, which connected the city to an ancient course of the Sabarmati river on the trade route. This trade route stretched between Harappan cities in Sindh and the peninsula of Saurashtra where the surrounding Kutch desert of today was a part of the Arabian Sea. However, this interpretation has been challenged by other archaeologists, who argue Khufu's Red Sea harbour at Wadi al-Jarf is older, dating its construction to between 2580 to 2550 BC and that Lothal was a comparative ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
