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Marty Stratton and Hugo Martin, directors of Doom. Doom is a first-person shooter video game and a reboot of the Doom franchise released on May 13, 2016. Players take the role of an unnamed space marine who battles demonic forces within an energy-mining facility on Mars and in Hell. The game also has an online multiplayer mode and a level editor.
Mark Elliot Zuckerberg (/ˈzʌkərbɜːrɡ/; born May 14, 1984) is an American businessman and philanthropist. He co-founded the social media service Facebook, along with his Harvard roommates in 2004, and its parent company Meta Platforms (formerly Facebook, Inc.), of which he is chairman, chief executive officer and controlling shareholder ...
- 3
- Harvard University (dropped out)
- 2004–present
Alexander III of Macedon (Ancient Greek: Ἀλέξανδρος, romanized: Alexandros; 20/21 July 356 BC – 10/11 June 323 BC), most commonly known as Alexander the Great, was a king of the ancient Greek kingdom of Macedon. He succeeded his father Philip II to the throne in 336 BC at the age of 20 and spent most of his ruling years conducting a lengthy military campaign throughout Western ...
- History
- Principles and Capacities
- Sample Preparation
- Scanning Process and Image Formation
- Detection of Backscattered Electrons
- Beam-Injection Analysis of Semiconductors
- Cathodoluminescence
- X-Ray Microanalysis
- Resolution of The Sem
- Environmental Sem
An account of the early history of scanning electron microscopy has been presented by McMullan. Although Max Knoll produced a photo with a 50 mm object-field-width showing channeling contrast by the use of an electron beam scanner, it was Manfred von Ardenne who in 1937 invented a microscope with high resolution by scanning a very small raster with...
The signals used by a SEM to produce an image result from interactions of the electron beam with atoms at various depths within the sample. Various types of signals are produced including secondary electrons (SE), reflected or back-scattered electrons (BSE), characteristic X-rays and light (cathodoluminescence) (CL), absorbed current (specimen curr...
SEM samples have to be small enough to fit on the specimen stage, and may need special preparation to increase their electrical conductivity and to stabilize them, so that they can withstand the high vacuum conditions and the high energy beam of electrons. Samples are generally mounted rigidly on a specimen holder or stub using a conductive adhesiv...
In a typical SEM, an electron beam is thermionically emitted from an electron gun fitted with a tungsten filament cathode. Tungsten is normally used in thermionic electron guns because it has the highest melting point and lowest vapor pressure of all metals, thereby allowing it to be electrically heated for electron emission, and because of its low...
Backscattered electrons (BSE) consist of high-energy electrons originating in the electron beam, that are reflected or back-scattered out of the specimen interaction volume by elastic scattering interactions with specimen atoms. Since heavy elements (high atomic number) backscatter electrons more strongly than light elements (low atomic number), an...
The nature of the SEM's probe, energetic electrons, makes it uniquely suited to examining the optical and electronic properties of semiconductor materials. The high-energy electrons from the SEM beam will inject charge carriers into the semiconductor. Thus, beam electrons lose energy by promoting electrons from the valence band into the conduction ...
Cathodoluminescence, the emission of light when atoms excited by high-energy electrons return to their ground state, is analogous to UV-induced fluorescence, and some materials such as zinc sulfide and some fluorescent dyes, exhibit both phenomena. Over the last decades, cathodoluminescence was most commonly experienced as the light emission from t...
Characteristic X-rays that are produced by the interaction of electrons with the sample may also be detected in an SEM equipped for energy-dispersive X-ray spectroscopy or wavelength dispersive X-ray spectroscopy. Analysis of the x-ray signals may be used to map the distribution and estimate the abundance of elements in the sample.
SEM is not a camera and the detector is not continuously image-forming like a CCD array or film. Unlike in an optical system, the resolution is not limited by the diffraction limit, fineness of lenses or mirrors or detector array resolution. The focusing optics can be large and coarse, and the SE detector is fist-sized and simply detects current. I...
Conventional SEM requires samples to be imaged under vacuum, because a gas atmosphere rapidly spreads and attenuates electron beams. As a consequence, samples that produce a significant amount of vapour, e.g. wet biological samples or oil-bearing rock, must be either dried or cryogenically frozen. Processes involving phase transitions, such as the ...
Name The church was historically named either for the Resurrection of Jesus, or for his tomb, which is located at its focal point.The Church of the Holy Sepulchre is also known as the Basilica of the Holy Sepulchre, or simply the Holy Sepulchre.Eastern Christians also call it the Church of the Resurrection or Church of the Anastasis, Anastasis being Greek for Resurrection.
The Castle of Rocca Calascio is a mountaintop fortress or rocca in the municipality of Calascio, in the Province of L'Aquila, Abruzzo, Italy. At an elevation of around 1,460 metres (4,790 ft), the castle is the highest fortress in the Apennines. Built of stone and masonry exclusively for military purposes and intended only to accommodate troops ...
The Colosseum ( / ˌkɒləˈsiːəm / KOL-ə-SEE-əm; Italian: Colosseo [kolosˈsɛːo]) is an elliptical amphitheatre in the centre of the city of Rome, Italy, just east of the Roman Forum. It is the largest ancient amphitheatre ever built, and is still the largest standing amphitheatre in the world, despite its age.
