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Wootz Steel
Wootz steel is a crucible steel characterized by a pattern of bands and high carbon content. These bands are formed by sheets of microscopic carbides within a tempered martensite or pearlite matrix in higher-carbon steel, or by ferrite and pearlite banding in lower-carbon steels. It was a pioneering steel alloy developed in southern India in the mid-1st millennium BC and exported globally. History Wootz steel originated in the mid-1st millennium BC in India, wootz steel was made in Golconda in Telangana, Karnataka, Tamilnadu and Sri Lanka. The steel was exported as cakes of steely iron that came to be known as "wootz". The method was to heat black magnetite ore in the presence of carbon in a sealed clay crucible inside a charcoal furnace to completely remove slag. An alternative was to smelt the ore first to give wrought iron, then heat and hammer it to remove slag. The carbon source was bamboo and leaves from plants such as Avārai. Locals in Sri Lanka adopted the productio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watered Pattern On Sword Blade1
Water is an inorganic compound with the chemical formula . It is a transparent, tasteless, odorless, and Color of water, nearly colorless chemical substance. It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food energy or organic micronutrients. Its chemical formula, , indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. In liquid form, is also called "water" at standard temperature and pressure. Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, a liquid, and a gas. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slag
The general term slag may be a by-product or co-product of smelting (pyrometallurgical) ores and recycled metals depending on the type of material being produced. Slag is mainly a mixture of metal oxides and silicon dioxide. Broadly, it can be classified as ferrous (co-products of processing iron and steel), ferroalloy (a by-product of ferroalloy production) or non-ferrous/ base metals (by-products of recovering non-ferrous materials like copper, nickel, zinc and phosphorus). Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace slags, air-cooled blast furnace slag, granulated blast furnace slag, basic oxygen furnace slag, and electric arc furnace slag). Slag generated from the EAF process can contain toxic metals, which can be hazardous to human and environmental health. Due to the large demand for ferrous, ferralloy, and non-ferrous materials, slag production has increased throughout the years des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Damascus
Damascus ( , ; ) is the capital and List of largest cities in the Levant region by population, largest city of Syria. It is the oldest capital in the world and, according to some, the fourth Holiest sites in Islam, holiest city in Islam. Known colloquially in Syria as () and dubbed, poetically, the "City of Jasmine" ( ), Damascus is a major cultural center of the Levant and the Arab world. Situated in southwestern Syria, Damascus is the center of a large metropolitan area. Nestled among the eastern foothills of the Anti-Lebanon mountain range inland from the eastern shore of the Mediterranean on a plateau above sea level, Damascus experiences an arid climate because of the rain shadow effect. The Barada, Barada River flows through Damascus. Damascus is one of the List of oldest continuously inhabited cities, oldest continuously inhabited cities in the world. First settled in the 3rd millennium BC, it was chosen as the capital of the Umayyad Caliphate from 661 to 750. Afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabic Poetry
Arabic poetry ( ''ash-shi‘r al-‘arabīyy'') is one of the earliest forms of Arabic literature. Pre-Islamic Arabic poetry contains the bulk of the oldest poetic material in Arabic, but Old Arabic inscriptions reveal the art of poetry existed in Arabic writing in material as early as the 1st century BCE, with oral poetry likely being much older still. Arabic poetry is categorized into two main types, rhymed or measured, and prose, with the former greatly preceding the latter. The rhymed poetry falls within fifteen different meters collected and explained by al-Farahidi in ''The Science of ‘ Arud''. Al-Akhfash, a student of al-Farahidi, later added one more meter to make them sixteen. The meters of the rhythmical poetry are known in Arabic as "seas" (''buḥūr''). The measuring unit of seas is known as "''taf‘īlah''," and every sea contains a certain number of taf'ilas which the poet has to observe in every verse ('' bayt'') of the poem. The measuring procedure of a p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabian Sea
The Arabian Sea () is a region of sea in the northern Indian Ocean, bounded on the west by the Arabian Peninsula, Gulf of Aden and Guardafui Channel, on the northwest by Gulf of Oman and Iran, on the north by Pakistan, on the east by India, and on the southeast by the Laccadive Sea and the Maldives, on the southwest by Somalia. Its total area is and its maximum depth is . The Gulf of Aden in the west connects the Arabian Sea to the Red Sea through the strait of Bab-el-Mandeb, and the Gulf of Oman is in the northwest, connecting it to the Persian Gulf. Geography The Arabian Sea's surface area is about .Arabian Sea Encyclopædia Britannica The maximum width of the sea is approximately , and its maximum depth is . The biggest river flowing into the sea is the Indus River. The Arabian Sea has two ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Hindu
''The Hindu'' is an Indian English-language daily newspaper owned by The Hindu Group, headquartered in Chennai, Tamil Nadu. It was founded as a weekly publication in 1878 by the Triplicane Six, becoming a daily in 1889. It is one of the Indian Newspaper of record, newspapers of record. , ''The Hindu'' is published from 21 locations across 11 states of India. ''The Hindu'' has been a family-owned newspaper since 1905, when it was purchased by S. Kasturi Ranga Iyengar from the original founders. It is now jointly owned by Iyengar's descendants, referred to as the "Kasturi family", who serve as the directors of the holding company. Except for a period of around two years, when Siddharth Varadarajan, S. Varadarajan held the editorship of the newspaper, senior editorial positions of the paper have always been held by members of the original Iyengar family or by those appointed by them under their direction. In June 2023, the former chairperson of the group, Malini Parthasarathy, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightner Publishing Company
Lightner is a surname. Notable people with the surname include: * Candy Lightner (born 1946), organizer and founding president of Mothers Against Drunk Drivers * Clarence Lightner (1921–2002), first popularly elected mayor of Raleigh, North Carolina, and first African-American elected mayor of a Southern city of over 50,000 residents * Mary Elizabeth Rollins Lightner (1818–1913), Mormon pioneer * Sarah Lightner, Michigan politician * Sherri Lightner (born 1950), California politician * Theodore Lightner (died 1981), American bridge player * Winnie Lightner (1899–1971), American film actress Fictional characters: *Violet Lightner, better known as Armory (comics), in the Marvel Comic universe See also *Lightner Witmer Lightner Witmer (June 28, 1867 – July 19, 1956) was an American psychologist. He introduced the term " clinical psychology" and is often credited with founding the field that it describes. Witmer created the world's first "psychological clinic" ... (1867–19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Antiquity
Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural History of Europe, European history between the 8th century BC and the 5th century AD comprising the interwoven civilizations of ancient Greece and ancient Rome, Rome known together as the Greco-Roman world, centered on the Mediterranean Basin. It is the period during which ancient Greece and Rome flourished and had major influence throughout much of Europe, North Africa, and West Asia. Classical antiquity was succeeded by the period now known as late antiquity. Conventionally, it is often considered to begin with the earliest recorded Homeric Greek, Epic Greek poetry of Homer (8th–7th centuries BC) and end with the fall of the Western Roman Empire in 476 AD. Such a wide span of history and territory covers many disparate cultures and periods. ''Classical antiquity'' may also refer to an idealized vision among later people of what was, in Ed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mannar District
Mannar District ( ''Maṉṉār Māvaṭṭam''; ) is one of the 25 Districts of Sri Lanka, districts of Sri Lanka, the second level administrative division of the country. The district is administered by a District Secretariat headed by a Government Agent (Sri Lanka), District Secretary (previously known as a Government Agent (Sri Lanka), Government Agent) appointed by the Government of Sri Lanka, central government of Sri Lanka. The Capital city, capital of the district is Mannar, Sri Lanka, Mannar, which is located on Mannar Island. History Between the 5th century BC and 13th century AD, what is now Mannar District was part of Rajarata. Parts Mannar District were thereafter part of the pre-colonial Jaffna kingdom. The district then came under Portuguese Ceylon, Portuguese, Dutch period in Ceylon, Dutch and British Ceylon, British control. In 1815 the British gained control of the entire island of Ceylon. They divided the island into three ethnic based administrative structures: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samanalawewa
The Samanala Dam ( Sinhala: සමනලවැව වේල්ල) is a dam primarily used for hydroelectric power generation in Sri Lanka. Commissioned in 1992, the Samanalawewa Project (''Samanala Reservoir Project'') is the third-largest hydroelectric scheme in the country, producing 405 GWh of energy annually. It was built with financial support from Japan and the United Kingdom. It is notable for a large leak on its right bank. Power production continues as planned despite the leakage, and the water from the leak now provides two thirds of the water issued by the reservoir for agriculture in downstream areas. Location The Samanala Dam is located in the Uda Walawe basin. It was built at the confluence of the Walawe river and the Belihul Oya, a location above mean sea level. It is near the town of Balangoda, southeast of the capital Colombo. The ground of the project area is karstic. Background and development With the Mahaweli and Laxapana hydroelectric powe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tissamaharama
Tissamaharama ( , ) is a town in Hambantota District, Southern Province, Sri Lanka. History It was the capital of the Kingdom of Ruhuna as early as the 3rd century B.C. Few buildings from that period survived. The presence of early Tamils in Tissamaharama was confirmed following archaeological excavations in 2010. The Tissamaharama Tamil Brahmi inscription, a fragment of black and red ware flat dish inscribed in Tamil in the Tamil Brahmi script was excavated at the earliest layer in the town. The large, artificial Tissa Wewa lake, which was a part of an irrigation system, dates from that time. The five main nearby lakes are Tissa Wewa; Yoda Wewa; Weerawila Wewa; Pannegamuwa Wewa; and Debarawewa Wewa. The town mainly serves as a starting point for visits to Yala National Park and Kataragama. Archaeology The archaeological excavations brought to light earliest urban phase in the 4th century BC. Fired bricks, Buddhist saddle querns, a potsherd with triangular sail (excavate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anuradhapura
Anuradhapura (, ; , ) is a major city located in the north central plain of Sri Lanka. It is the capital city of North Central Province, Sri Lanka, North Central Province and the capital of Anuradhapura District. The city lies north of the current capital of Colombo in the North Central Province, on the banks of the historic Malwathu Oya. The city is now a World Heritage Site famous for its well-preserved ruins of the ancient Sinhala Kingdom, Sinhalese civilisation. While ''Mahāvaṃsa'' places the founding of the city in 437 BCE, the site has been inhabited for much longer, making it a major human settlement on the island for almost three millennia and one of the List of oldest continuously inhabited cities, oldest continuously occupied cities in Asia. It is the cradle of the Hydraulic Sinhalese civilisation, Theravada Buddhism, and the longest-serving List of capitals in Sri Lanka, ancient capital of Sri Lanka that has survived for 1500 years. Moreover, it was the first capi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
