Two major tourist attractions are located at above m altitude m, to be precise: Babele , a rock formation resembling human silhouettes. The cave has 3 levels: It is said this cave was used by Zamolxe and his people to hide and pray when they were under attack. At this level you can find one of its most peculiar attractions: The second level hosts two Dacian tombs, and the third level a glaciar lake.
Specimen labels Nomenclature The following information is derived from Barry Bolton’s New General Catalogue , a catalogue of the world’s ants. Formica badia Latreille, c: Senior synonym of transversa and its junior synonyms brevipennis, crudelis: Atta crudelis Smith, F. Junior synonym of transversa: Myrmica brevipennis Smith, F.
Archaeomagnetic dating is the study and interpretation of the signatures of the Earth’s magnetic field at past times recorded in archaeological materials. These paleomagnetic signatures are fixed when ferromagnetic materials such as magnetite cool below the Curie point, freezing the magnetic moment of the material in the direction of the local magnetic field at that time.
Two characteristics of thermoluminescence distinguish it from incandescence. First, the intensity of thermoluminescent emission does not remain constant at constant temperature, but decreases with time and eventually ceases altogether. Second, the spectrum of the thermoluminescence is highly dependent on the composition of the material and is only slightly affected by the temperature of heating. If a thermoluminescent material emits both thermoluminescence and incandescent light at some temperature of observation, the transient light emission is the thermoluminescence and the remaining steady-state emission is the incandescence.
The transient nature of the thermoluminescent emission suggests that heating merely triggers the release of stored energy previously imparted to the material. Supporting this interpretation is the fact that after the thermoluminescence has been reduced to zero by heating, the sample can be made thermoluminescent again by exposure to one of a number of energy sources: A thermoluminescent material, therefore, has a memory of its earlier exposure to an energizing source, and this memory is utilized in a number of applications.
Many natural minerals are thermoluminescent, but the most efficient materials of this type are specially formulated synthetic solids phosphors. See Luminescence In addition to special sites capable of emitting light luminescent centers , thermoluminescent phosphors have centers that can trap electrons or holes when these are produced in the solid by ionizing radiation.
The luminescent center itself is often the hole trap, and the electron is trapped at another center, although the reverse situation can also occur. In the former case, if the temperature is low and the energy required to release an electron from a trap the trap depth is large, electrons will remain trapped and no luminescence will occur.
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Share The Citadel Council is the governing body of the Citadel. Convening in the impressive Citadel Tower , the Council is the ultimate authority in Citadel space , passing judgement for violations of Council law, settling disputes between governments, and maintaining law and order, often through the use of its own covert intelligence service, the Spectres. The Council is an executive committee composed of one representative each from the member species.
Though they have no official power over the independent governments of other species, the Council’s decisions carry great weight throughout the galaxy. No single Council race is strong enough to defy the others, and all have a vested interest in compromise and cooperation.
Using Optically Stimulated Luminescence (OSL) dating, it was found that the quartz sediments in which the ochre containers were buried dated to almost , years ago, which is consistent with the thermoluminescence dating of burnt lithics and the dating of calcium carbonate concretions using uranium-series dating methods.
A page from Historia ecclesiastica gentis Anglorum In his Historia ecclesiastica gentis Anglorum, Bede records that the first chieftains among the Angles, Saxons, and Jutes in England were said to be Hengist and Horsa. Bede says that Horsa was killed in battle against the Britons and was thereafter buried in east Kent.
Bede adds that a monument bearing Horsa’s name stood in east Kent at the time of his writing. Hengist and Horsa arrived at a place called Ipwinesfleet, and went on to defeat the Picts wherever they fought them. Hengist and Horsa sent word to the Angles describing “the worthlessness of the Britons, and the richness of the land” and asked for assistance. Their request was granted and support arrived.
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At higher temperatures, CO 2 has poor solubility in water, which means there is less CO 2 available for the photosynthetic reactions. The enrichment of bone 13 C also implies that excreted material is depleted in 13 C relative to the diet. This increase in 14 C concentration almost exactly cancels out the decrease caused by the upwelling of water containing old, and hence 14 C depleted, carbon from the deep ocean, so that direct measurements of 14 C radiation are similar to measurements for the rest of the biosphere.
Correcting for isotopic fractionation, as is done for all radiocarbon dates to allow comparison between results from different parts of the biosphere, gives an apparent age of about years for ocean surface water. The deepest parts of the ocean mix very slowly with the surface waters, and the mixing is uneven.
Hengist and Horsa sent word to the Angles describing “the worthlessness of the Britons, and the richness of the land” and asked for assistance. Their request was granted and support arrived. Afterward, more people arrived in Britain from “the three powers of Germany ; the Old Saxons, the Angles, and the Jutes”.
A biography of the Australian continent Nauwalabila I Arnhem Land This rock shelter is formed by a massive boulder that toppled off the nearby escarpment. This sloping sandstone slab covers a black, sandy floor on which were found stone tools and spear points. The site is now known as Nauwalabila I. It had previously been called the Linder Site after a local explorer. Excavations found stone tools to a depth of 3 m below present surface.
Charcoal was found at a depth between 1. A layer of weathered sandstone rubble about 40 cm thick was found under the sand layer. Below this rubble was a a layer of large rocks and red sand. Stone tools were found in the basal parts of the rubble – heavy weathered quartzite flakes, that reveal a thick chemically-weathered skin on the outer surface if they are snapped.
These used flakes were found throughout the top 1. The lowest example of these flakes coming from ground-edge axes is in the 14, year old level.
How many glaciers are there in Antarctica?
Dating Here of some of the well-tested methods of dating used in the study of early humans: Potassium-argon dating, Argon-argon dating, Carbon or Radiocarbon , and Uranium series. All of these methods measure the amount of radioactive decay of chemical elements; the decay occurs in a consistent manner, like a clock, over long periods of time.
Samarium–neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites, based on radioactive decay of a long-lived samarium (Sm) isotope to a radiogenic neodymium (Nd) isotope.
A pyramid is seen behind the Great Sphinx of Giza. Pyramid in hieroglyphs The Egyptian pyramids are ancient pyramid-shaped masonry structures located in Egypt. There have been one hundred and thirty-eight pyramids discovered in Egypt as of This pyramid and its surrounding complex were designed by the architect Imhotep , and are generally considered to be the world’s oldest monumental structures constructed of dressed masonry.
The most famous Egyptian pyramids are those found at Giza , on the outskirts of Cairo. Several of the Giza pyramids are counted among the largest structures ever built. It is the only one of the Seven Wonders of the Ancient World still in existence. Contents [ show ] Historical development By the time of the early dynastic period of Egyptian history, those with sufficient means were buried in bench-like structures known as mastabas.
Imhotep is credited with being the first to conceive the notion of stacking mastabas on top of each other — creating an edifice composed of a number of “steps” that decreased in size towards its apex. The result was the Step Pyramid of Djoser — which was designed to serve as a gigantic stairway by which the soul of the deceased pharaoh could ascend to the heavens. Such was the importance of Imhotep’s achievement that he was deified by later Egyptians.
It was during this time that the most famous pyramids, those near Giza, were built. Over time, as authority became less centralized, the ability and willingness to harness the resources required for construction on a massive scale decreased, and later pyramids were smaller, less well-built and often hastily constructed. Long after the end of Egypt’s own pyramid-building period, a burst of pyramid-building occurred in what is present-day Sudan , after much of Egypt came under the rule of the Kings of Napata.
Hengist and Horsa
Features[ edit ] According to John Carmack , the lead graphics engine developer at id , the “tripod of features” in Doom 3 technology is: Unified lighting and shadowing Complex animations and scripting that show off real-time, fully dynamic per-pixel lighting and stencil shadowing. GUI surfaces that add extra interactivity to the game The key advance of the Doom 3 graphics engine is the unified lighting and shadowing.
All 3D engines up to and including Quake III and Unreal Tournament had computed or rendered lightmaps during map creation, saving that information in the map data, which made the lighting extremely static. By contrast in the new Doom 3 engine, most light sources are computed on the fly.
This estimate was made by combining data from uranium-thorium dating, electron spin resonance dating and optically stimulated luminescence (OSL) dating of the remains and the soil in the grave. This estimate was very controversial,    and some of .
Using his super-speed powers, he taps into the Speed Force and becomes a costumed crime-fighter. He is a founding member of the Justice League. Origin When Barry was a boy, his parents’ relationship wasn’t going well, and while he prepared to participate in a spelling bee at school, his mother Nora was struggling to encourage him despite working double shifts and trying to get a divorce from his father Henry. He received the divorce papers on the day of the spelling bee, and because Nora had to work, he seethed and took Barry to school.
When Nora returned from work, she was happy to see that her son had won the competition, but she was obligated to speak to Henry about their relationship, and so Barry was sent to the bookstore in the meantime. By the time Barry returned, his mother had been murdered, and his father had been placed under arrest, though he professed his innocence. Fortunately, Darryl Frye , who had secretly been involved romantically with Nora, pulled some strings and was able to take Barry in.
Having learned from Darryl that the search for evidence, in that case, would inevitably lead to the truth, Barry became a forensic scientist. For years, he visited Henry in prison, promising to look over all of the evidence of his mother’s murder case until he found a way to prove his father’s innocence. After years of coming back, and failing to find any proof, Henry broke down and admitted that he had committed the crime.
The shock of realizing that all of his efforts had been for nothing depressed Barry. On the night of a storm, Barry angrily tore his lab apart. Suddenly, a bolt of lightning crashed through his lab’s window, and struck him in the chest, causing him to drop the chemical vials he was carrying, and douse himself.