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Wootz Steel
Wootz steel, also known as Seric 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 India in the mid-1st millennium BC and exported globally. History Wootz steel originated in the mid-1st millennium BC in South India, in present-day Tiruchirappalli, Kodumanal, Erode, Tamil Nadu. There are several ancient Tamil, North Indian, Greek, Chinese and Roman literary references to high carbon Tamil steel. In later times, wootz steel was also made in Golconda in Telangana, Karnataka 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watered Pattern On Sword Blade1
Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which 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, H2O, 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°. "Water" is also the name of the liquid state of H2O at standard temperature and pressure. A number of natural states of water exist. 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 may precipitate in the form of snow. The gaseous state of water is steam or water vapor. Water co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Journal Of History Of Science
The Indian National Science Academy (INSA) is a national academy in New Delhi for Indian scientists in all branches of science and technology. In August 2019, Dr. Chandrima Shaha was appointed as the president of Indian National Science Academy, becoming the first woman to head the INSA (for 2020–22). In 2015 INSA has constituted a junior wing for young scientists in the country named Indian National Young Academy of Sciences (INYAS) in line with other national young academies. INYAS is the academy for young scientists in India as a national young academy and is affiliated with Global Young Academy. INYAS is also a signatory of the declaration on the Core Values of Young Academies, adopted at World Science Forum, Budapest on 20 November 2019 History The Genesis: Indian National Science Academy (INSA), New Delhi is an autonomous institution of Dept. Science & Technology, Govt. of India. However, the origins of INSA can be traced back to the founding of National Institute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabic Poetry
Arabic poetry ( ar, الشعر العربي ''ash-shi‘ru al-‘Arabīyyu'') is the earliest form of Arabic literature. Present knowledge of poetry in Arabic dates from the 6th century, but oral poetry is believed to predate that. 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 poem is very rigorous. Sometimes adding or removing a consonant or a vowel can shift the ''bayt'' from one meter to another. Also, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabian Sea
The Arabian Sea ( ar, اَلْبَحرْ ٱلْعَرَبِيُّ, Al-Bahr al-ˁArabī) is a region of the northern Indian Ocean bounded on the north by Pakistan, Iran and the Gulf of Oman, on the west by the Gulf of Aden, Guardafui Channel and the Arabian Peninsula, on the southeast by the Laccadive Sea and the Maldives, on the southwest by Somalia, and on the east by India. Its total area is 3,862,000 km2 (1,491,000 sq mi) and its maximum depth is 4,652 meters (15,262 ft). 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. Name The sea is named after Arabia, the historic name of the region to the west of the sea. The Arabian Sea's name in Arabic is ; in Persian it is دریای عرب; in Urdu it is بحیرہ عرب; in Hindi it is अरब सागर; in Gujarati it is અરબી સમુદ્ર; in Marathi it ... [...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 began as a weekly in 1878 and became a daily in 1889. It is one of the Indian newspapers of record and the second most circulated English-language newspaper in India, after '' The Times of India''. , ''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. The current chairperson of the group is Malini Parthasarathy, a great-granddaughter of Iyengar. Except for a period of about two years, when Siddharth Varadarajan, S. Varadarajan held the editorship of the newspaper, the editorial positions of the paper were always held by members of the family or held under t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Antiquity
Classical antiquity (also the classical era, classical period or classical age) is the period of cultural history between the 8th century BC and the 5th century AD centred on the Mediterranean Sea, comprising the interlocking civilizations of ancient Greece and ancient Rome known as the Greco-Roman world. It is the period in which both Greek and Roman societies flourished and wielded huge influence throughout much of Europe, North Africa, and Western Asia. Conventionally, it is taken to begin with the earliest-recorded Epic Greek poetry of Homer (8th–7th-century BC), and continues through the emergence of Christianity (1st century AD) and the fall of the Western Roman Empire (5th-century AD). It ends with the decline of classical culture during late antiquity (250–750), a period overlapping with the Early Middle Ages (600–1000). Such a wide span of history and territory covers many disparate cultures and periods. ''Classical antiquity'' may also refer to an idealized vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tissamaharama Tamil Brahmi Inscription
Tissamaharama inscription No. 53 refers to a fragment of black and red ware flat dish inscribed in Brahmi script excavated at the earliest layer in southern town of Tissamaharama in Sri Lanka. It is dated to approximately 200 BC by German scholars who undertook the excavation. There are differences of opinion among scholars about the reading and interpretation of this inscription. The reading of this inscription by Iravatham Mahadevan in Tamil was accepted by P. Ragupathy but he rejected the Mahadevan's interpretation. Other scholars such as Harry Falk, Raj Somadeva and P. Pushparatnam rejected both the reading and interpretations by Mahadevan as well as Ragupathy. As a result of these disagreements between the scholars, the reading and interpretation of this legend as a Tamil-Brahmi inscription has become controversial today. The reading of the inscription According to Mahadevan and P. Ragupthy, this inscription is a combination of readable Brahmi and Megalithic graffiti symbols ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mannar District
Mannar District ( ta, மன்னார் மாவட்டம் ''Maṉṉār Māvaṭṭam''; si, මන්නාරම දිස්ත්රික්කය) is one of the 25 districts of Sri Lanka, the second level administrative division of the country. The district is administered by a District Secretariat headed by a District Secretary (previously known as a Government Agent) appointed by the central government of Sri Lanka. The capital of the district is 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, Dutch and British control. In 1815 the British gained control of the entire island of Ceylon. They divided the island into three ethnic based administrative structures: Low Country Sinhalese, Kandyan Sinhalese and Tamil. The district was part of th ... [...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 and southeast of Colombo, the capital. The ground of the project area is karstic. Background and development With the Mahaweli and Laxapana hydroelectric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tissamaharama
Tissamaharama ( si, තිස්සමහාරාමය , ta, திஸ்ஸமஹாராம) is a town in Hambantota District, Southern Province, Sri Lanka. History It was the capital of the Sinhalese 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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anuradhapura
Anuradhapura ( si, අනුරාධපුරය, translit=Anurādhapuraya; ta, அனுராதபுரம், translit=Aṉurātapuram) is a major city located in north central plain of Sri Lanka. It is the capital city of North Central Province, Sri Lanka 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 Malvathu River. The city is now a World Heritage Site famous for its well-preserved ruins of the ancient Sinhalese civilization. While Mahavamsa place 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 oldest continuously occupied cities in Asia. It is the cradle of the Hydraulic Sinhalese civilization, Theravada Buddhism, and the longest-serving 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] |
Senna Auriculata
''Senna auriculata'' is a leguminous tree in the subfamily Caesalpinioideae. It is commonly known by its local names matura tea tree, avaram or ranawara , ( kn, ಆವರಿಕೆ ''āvarike'', Marathi: तरवड, Malayalam: ആവര, si, රණවරා ''ranawarā'', te, తంగేడు ''taṃgēḍu'', ta, ஆவாரை ''āvārai'') or the English version avaram senna. It is the State flower of Telangana. It occurs in the dry regions of India and Sri Lanka. It is common along the sea coast and the dry zone in Sri Lanka. Description Jayaweera (1981) Avaram senna is a much branched shrub with smooth cinnamon brown bark and closely pubescent branchlets. The leaves are alternate, stipulate, paripinnate compound, very numerous, closely placed, rachis 8.8-12.5 cm long, narrowly furrowed, slender, pubescent, with an erect linear gland between the leaflets of each pair, leaflets 16-24, very shortly stalked 2-2.5 cm long 1-1.3 cm broad, slightly overlap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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