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Ring Ditch
In archaeology, a ring ditch is a trench of circular or penannular plan, cut into bedrock. They are usually identified through aerial photography either as soil marks or cropmarks. When excavated, ring ditches are usually found to be the ploughed‐out remains of a round barrow where the barrow mound has completely disappeared, leaving only the infilled former quarry ditch. Both Neolithic and Bronze Age ring ditches have been discovered. The term is most often used as a generic description in cases where there is no clear evidence for the function of the site: for instance where it has been ploughed flat and is known only as a cropmark or a geophysical anomaly. The two most frequent monument types represented by ring ditches are roundhouses (where the 'ditch' is actually a foundation slot or eaves drip gully) and round barrows. The term is not normally used for larger features than these. Larger features would instead be described as 'circular enclosures'. Also related to ring dit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeology
Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscapes. Archaeology can be considered both a social science and a branch of the humanities. It is usually considered an independent academic discipline, but may also be classified as part of anthropology (in North America – the four-field approach), history or geography. Archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology is distinct from palaeontology, which is the study of fossil remains. Archaeology is particularly important for learning about prehistoric societies, for which, by definition, there are no written records. Prehistory includes over 99% of the human past, from the Paleolithic until th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolithic
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of settlement. It began about 12,000 years ago when farming appeared in the Epipalaeolithic Near East, and later in other parts of the world. The Neolithic lasted in the Near East until the transitional period of the Chalcolithic (Copper Age) from about 6,500 years ago (4500 BC), marked by the development of metallurgy, leading up to the Bronze Age and Iron Age. In other places the Neolithic followed the Mesolithic (Middle Stone Age) and then lasted until later. In Ancient Egypt, the Neolithic lasted until the Protodynastic period, 3150 BC.Karin Sowada and Peter Grave. Egyp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bronze Age
The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second principal period of the three-age system proposed in 1836 by Christian Jürgensen Thomsen for classifying and studying ancient societies and history. An ancient civilization is deemed to be part of the Bronze Age because it either produced bronze by smelting its own copper and alloying it with tin, arsenic, or other metals, or traded other items for bronze from production areas elsewhere. Bronze is harder and more durable than the other metals available at the time, allowing Bronze Age civilizations to gain a technological advantage. While terrestrial iron is naturally abundant, the higher temperature required for smelting, , in addition to the greater difficulty of working with the metal, placed it out of reach of common use until the end of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cropmark
Cropmarks or crop marks are a means through which sub-surface archaeological, natural and recent features may be visible from the air or a vantage point on higher ground or a temporary platform. Such marks, along with parch marks, soil marks and frost marks, can reveal buried archaeological sites that are not visible from the ground. Description Crop marks are due to the principle of differential growth. One of the factors controlling the growth of vegetation is the condition of the soil. A buried stone wall, for example, will affect crop growth above it, as its presence channels water away from its area and occupies the space of the more fertile soil. Conversely, a buried ditch, with a fill containing more organic matter than the natural earth, provides much more conducive conditions and water will naturally collect there, nourishing the plants growing above. The differences in conditions will cause some plants to grow more strongly and therefore taller, and others less s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Causewayed Ring Ditch
A causewayed ring ditch is a type of prehistoric monument. It comprises a roughly circular ditch, segmented by several causeways which cross it. Within the ditch is a central area used for inhumations and cremations, usually covered beneath a barrow. They are considerable smaller than the causewayed enclosures they resemble. In the British Isles they date to the Neolithic The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several p ... period. External linksA causewayed ring ditch at Irthlingborough Stone Age Britain Types of monuments and memorials Causeways {{europe-archaeology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance Survey
Ordnance Survey (OS) is the national mapping agency for Great Britain. The agency's name indicates its original military purpose (see ordnance and surveying), which was to map Scotland in the wake of the Jacobite rising of 1745. There was also a more general and nationwide need in light of the potential threat of invasion during the Napoleonic Wars. Since 1 April 2015 Ordnance Survey has operated as Ordnance Survey Ltd, a government-owned company, 100% in public ownership. The Ordnance Survey Board remains accountable to the Secretary of State for Business, Energy and Industrial Strategy. It was also a member of the Public Data Group. Paper maps for walkers represent only 5% of the company's annual revenue. It produces digital map data, online route planning and sharing services and mobile apps, plus many other location-based products for business, government and consumers. Ordnance Survey mapping is usually classified as either " large-scale" (in other words, more detaile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthworks (engineering)
Earthworks are engineering works created through the processing of parts of the earth's surface involving quantities of soil or unformed rock. Shoring structures An incomplete list of possible temporary or permanent geotechnical shoring structures that may be designed and utilised as part of earthworks: * Mechanically stabilized earth * Earth anchor * Cliff stabilization *Grout curtain *Retaining wall * Slurry wall * Soil nailing *Tieback (geotechnical) * Trench shoring * Caisson * Dam * Gabion * Ground freezing Gallery File:Mechanically stabilized earth diagram.gif, Mechanically stabilized earth File:GroutCurtain.gif, Grout curtain File:Retaining Wall Type Function.jpg, Retaining wall types File:Soil Nail.jpg, Soil nailing File:FEMA - 6044 - Photograph by Larry Lerner taken on 03-15-2002 in New York.jpg, Tieback File:Sbh s600.JPG, Trench shoring File:Caisson Schematic.svg, Caisson File:Vyrnwy dam.JPG, Dam File:Gabion 040.jpg, Gabions File:Cross section of a ground free ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yacuma River
The Yacuma River is a river in Bolivia, which feeds into the Mamoré River and ultimately into the Amazon. The headwaters of the Yacuma are within the Pilón Lajas Biosphere Reserve and Communal Lands. Rio Yacuma starts about east of Rurrenabaque Rurrenabaque is a small town in the north of Bolivia on the Beni River. It is the capital of Rurrenabaque Municipality. In recent years it has become popular with international tourism as it is an easy gateway for visits to Madidi National Park ( .... The upper parts are accessible through Reyes. References Rivers of Beni Department {{Bolivia-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advanced Spaceborne Thermal Emission And Reflection Radiometer
The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is a Japanese remote sensing instrument onboard the Terra satellite launched by NASA in 1999. It has been collecting data since February 2000. ASTER provides high-resolution images of Earth in 14 different bands of the electromagnetic spectrum, ranging from visible to thermal infrared light. The resolution of images ranges between 15 and 90 meters. ASTER data is used to create detailed maps of surface temperature of land, emissivity, reflectance, and elevation. In April 2008, the SWIR detectors of ASTER began malfunctioning and were publicly declared non-operational by NASA in January 2009. All SWIR data collected after 1 April 2008 has been marked as unusable. The ASTER Global Digital Elevation Model (GDEM) is available at no charge to users worldwide via electronic download. As of 2 April 2016, the entire catalogue of ASTER image data became publicly available online at no cost. It can be download ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Modal Analysis
Modal analysis is the study of the dynamic properties of systems in the frequency domain. Examples would include measuring the vibration of a car's body when it is attached to a shaker, or the noise pattern in a room when excited by a loudspeaker. Modern day experimental modal analysis systems are composed of 1) sensors such as transducers (typically accelerometers, load cells), or non contact via a Laser vibrometer, or stereophotogrammetric cameras 2) data acquisition system and an analog-to-digital converter front end (to digitize analog instrumentation signals) and 3) host PC (personal computer) to view the data and analyze it. Classically this was done with a SIMO (single-input, multiple-output) approach, that is, one excitation point, and then the response is measured at many other points. In the past a hammer survey, using a fixed accelerometer and a roving hammer as excitation, gave a MISO (multiple-input, single-output) analysis, which is mathematically identical to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stavropol
Stavropol (; rus, Ставрополь, p=ˈstavrəpəlʲ) is a city and the administrative centre of Stavropol Krai, Russia. As of the 2021 Census, its population was 547,820, making it one of Russia's fastest growing cities. It was known as ''Voroshilovsk'' until January 12, 1943.Decree of January 12, 1943 Etymology The name ''Stavropol'' ( rus, Ста́врополь) is a Russian rendering of the Greek name, ( grc-gre, Σταυρούπολις 'City of the Cross'). According to legend, soldiers found a stone cross there while building the fortress in the city's future location. It is unrelated to Byzantine Stauroupolis (ancient Aphrodisias) in Asia Minor, nor to the city of Stavropol-on-Volga (now called Tolyatti). History It was founded on October 22, 1777Charter of Stavropol, Article 2 following the Russo-Turkish War of 1768–1774 as a military encampment, and was granted city status in 1785. Prince Grigory Potemkin, who founded Stavropol as on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyatigorsk
Pyatigorsk (russian: Пятиго́рск; Circassian: Псыхуабэ, ''Psıxwabæ'') is a city in Stavropol Krai, Russia located on the Podkumok River, about from the town of Mineralnye Vody where there is an international airport and about from Kislovodsk. Since January 19, 2010, it has been the administrative center of the North Caucasian Federal District of Russia. Population: Overview The name is derived from the fused Russian words "" (''five mountains'') and the city is so called because of the five peaks of the Beshtau (which also means ''five mountains'' in Turkic) of the Caucasian mountain range overlooking the city. It was founded in 1780, and has been a health spa with mineral springs since 1803. Pyatigorsk is one of the oldest spa resorts in Russia. The health resort provides unique medical resources, and its underground wealth supplies 50 different mineral springs, medical mud taken from Lake Tambukan located from Pyatigorsk, and the mild climate of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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