The Amarna letters (; sometimes referred to as the Amarna correspondence or Amarna tablets, and cited with the abbreviation EA, for "El Amarna") are an archive, written on clay tablets, primarily consisting of diplomatic correspondence between the Egyptian administration and its representatives in Canaan and Amurru, or neighboring kingdom leaders, during the New Kingdom, spanning a period of no more than thirty years between c. 1360–1332 BC (see here for dates). The letters were found in Upper Egypt at el-Amarna, the modern name for the ancient Egyptian capital of Akhetaten, founded by pharaoh Akhenaten (1350s–1330s BC) during the Eighteenth Dynasty of Egypt. The Amarna letters are unusual in Egyptological research, because they are written not in the language of ancient Egypt, but in cuneiform, the writing system of ancient Mesopotamia. Most are in a variety of Akkadian sometimes characterised as a mixed language, Canaanite-Akkadian; one especially long letter—abbreviated EA 24—was written in a late dialect of Hurrian, and is the longest contiguous text known to survive in that language. The known tablets total 382, of which...

A central massive object (CMO) is a high mass object or cluster of objects at the centre of a large star system, such as a galaxy or globular cluster. In the case of the former, the CMO may be a supermassive black hole, a nuclear star cluster, or even both together.The most massive galaxies are thought to always contain a supermassive black hole (SBH); these galaxies do not contain nuclear star clusters, and the CMO is identified with the SBH. Fainter galaxies usually contain a nuclear star cluster (NSC). In most of these galaxies, it is not known whether a supermassive black hole is present, and the CMO is identified with the NSC. A few galaxies, for instance the Milky Way and NGC 4395, are known to contain both a SBH and a NSC.Although this is suggestive that all galaxies have CMOs, and that a common mechanism of galaxy formation causes both, ESA MIRI scientist Torsten Böker observes that some galaxies appear to have neither SBHs nor NSCs.The mass associated with CMOs is roughly 0.1–0.3% times the total mass of the galactic bulge. See also Core collapse (cluster) Galactic Center...

Cellular respiration is the process by which biological fuels are oxidised in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, to drive the bulk production of ATP. Cellular respiration may be described as a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy. Respiration is one of the key ways a cell releases chemical energy to fuel cellular activity. The overall reaction occurs in a series of biochemical steps, some of which are redox reactions. Although cellular respiration is technically a combustion reaction, it is an unusual one because of the slow, controlled release of energy from the series of reactions. Nutrients that are commonly used by animal and plant cells in respiration include sugar, amino acids and fatty acids, and the most common oxidizing agent is molecular oxygen (O2). The chemical energy stored in ATP (the bond of its...

Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites. The C chondrites represent only a small proportion (4.6%) of meteorite falls. Some famous carbonaceous chondrites are: Allende, Murchison, Orgueil, Ivuna, Murray, Tagish Lake, Sutter's Mill and Winchcombe. General description C chondrites contain a high proportion of carbon (up to 3%), which is in the form of graphite, carbonates and organic compounds, including amino acids. In addition, they contain water and minerals that have been modified by the influence of water.The carbonaceous chondrites were not exposed to higher temperatures, so that they are hardly changed by thermal processes. Some carbonaceous chondrites, such as the Allende meteorite, contain calcium-aluminum-rich inclusions (CAIs). These are compounds that emerged early from the primeval solar nebula, condensed out and represent the oldest minerals formed in the Solar System .Some primitive carbonaceous chondrites, such as the...

Heiligendamm (German pronunciation: [ˈhaɪlɪɡəndam]) is a German seaside resort founded in 1793. It is the oldest seaside spa in continental Europe. Heiligendamm is part of the town Bad Doberan in the state of Mecklenburg-Vorpommern and historically belongs to Mecklenburg. The cluster of resort architecture mansions and spa buildings at the seafront are reminders of the glory days when this part of the Baltic Sea was one of the playgrounds of Europe's aristocracy. Due to the classicist white buildings lining the beach promenade, the town is also known as the "White Pearl" (German: Weiße Perle) or the "White Town by the Sea" (German: Die weiße Stadt am Meer). Today, the area by the sea is occupied by a five-star hotel, the Grand Hotel Heiligendamm. A narrow-gauge steam railway, known as the "Molli", links Heiligendamm with Kühlungsborn and Bad Doberan. History Heiligendamm was developed as an elegant meeting place for the nobility and high society. Among its...

The Bahr el Ghazal (Arabic: بحر الغزال, lit. 'sea of gazelles'; also spelled Bahr al Ghazal and Baḩr al Ghazāl) is a river in South Sudan. The South Sudanese region of Bahr el Ghazal takes its name from the river. The Bahr el Ghazal is the main western tributary of the Nile. It is 716 kilometres (445 mi) long, flowing through the Sudd wetlands to Lake No, where it joins the White Nile. Hydrology The Bahr al Ghazal's drainage basin is the largest of any of the Nile's sub-basins, measuring 520,000 km2 (200,800 mi2) in size, but it contributes a relatively small amount of water, about 2 m³/s (70 ft³/s) annually, due to tremendous volumes of water being lost in the Sudd wetlands. Seasonally, the river's discharge ranges from nothing to 48 m³/s (1,700 ft³/s).According to some sources, the river is formed by the confluence of the Jur River and Bahr al-Arab rivers. However other more recent sources say the river rises in the Sudd wetlands with no definitive source, that the Jur River joins at Lake Ambadi, and the Bahr al-Arab joins below...

The World of Late Antiquity is a 1971 book by historian Peter Brown. The book was one of the first in the anglophone world to consider late antiquity as a distinct historical era. In 2014, the Folio Society republished an illustrated edition, with an introduction by historian Christopher Kelly. References

Ultimate tensile strength (UTS), often shortened to tensile strength (TS), ultimate strength, or F tu {\displaystyle F_{\text{tu}}} within equations, is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain. The highest point of the stress–strain curve is the ultimate tensile strength and has units of stress. The equivalent point for the...

Dolomitization is a geological process by which the carbonate mineral dolomite is formed when magnesium ions replace calcium ions in another carbonate mineral, calcite. It is common for this mineral alteration into dolomite to take place due to evaporation of water in the sabkha area. Dolomitization involves substantial amount of recrystallization. This process is described by the stoichiometric equation: 2 CaCO3(calcite) + Mg2+ ↔ CaMg(CO3)2(dolomite) + Ca2+Dolomitization depends on specific conditions which include low Ca:Mg ratio in solution, reactant surface area, the mineralogy of the reactant, high temperatures which represents the thermodynamic stability of the system, and the presence of kinetic inhibitors such as sulfate.If the kinetic inhibitors and high temperatures are compatible, then dolomitization can take place in saline environments above thermodynamic and kinetic saturation with respect to dolomite. This type of environment includes, freshwater and seawater mixing zones, normal saline to hypersaline subtidal environments, schizohaline environments (fluctuating salinity...

A capillary wave is a wave traveling along the phase boundary of a fluid, whose dynamics and phase velocity are dominated by the effects of surface tension. Capillary waves are common in nature, and are often referred to as ripples. The wavelength of capillary waves on water is typically less than a few centimeters, with a phase speed in excess of 0.2–0.3 meter/second. A longer wavelength on a fluid interface will result in gravity–capillary waves which are influenced by both the effects of surface tension and gravity, as well as by fluid inertia. Ordinary gravity waves have a still longer wavelength. When generated by light wind in open water, a nautical name for them is cat's paw waves. Light breezes which stir up such small ripples are also sometimes referred to as cat's paws. On the open ocean, much larger ocean surface waves (seas and swells) may result from coalescence of smaller wind-caused ripple-waves. Dispersion relation The dispersion relation describes the relationship between wavelength and frequency in waves. Distinction can be made between pure capillary waves...