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backscatter technique

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  • Electron backscatter diffraction — An electron backscatter diffraction pattern An electron backscatter diffraction pattern of monocrystalline silicon, taken …   Wikipedia

  • Anti-spam techniques — To prevent e mail spam (aka unsolicited bulk email), both end users and administrators of e mail systems use various anti spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users… …   Wikipedia

  • Email spam — An email box folder filled with spam messages. Email spam, also known as junk email or unsolicited bulk email (UBE), is a subset of spam that involves nearly identical messages sent to numerous recipients by email. Definitions of spam usually… …   Wikipedia

  • Anti-spam techniques (e-mail) — To prevent e mail spam, both end users and administrators of e mail systems use various anti spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users and administrators. No one… …   Wikipedia

  • Denial-of-service attack — DoS redirects here. For other uses, see DOS (disambiguation). DDoS Stacheldraht Attack diagram. A denial of service attack (DoS attack) or distributed denial of service attack (DDoS attack) is an attempt to make a computer resource unavailable to …   Wikipedia

  • Electron diffraction — is a technique used to study matter by firing electrons at a sample and observing the resulting interference pattern. This phenomenon occurs due to the wave particle duality, which states that a particle of matter (in this case the incident… …   Wikipedia

  • Particle-Induced X-ray Emission — or Proton Induced X ray Emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …   Wikipedia

  • Underwater photography — is the process of taking photographs while under water. It is usually done while scuba diving, but can be done while snorkeling or swimming.OverviewUnderwater imaging is considered an especially challenging area of photography, since it requires… …   Wikipedia

  • Ionosphere — The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner …   Wikipedia

  • Scanning electron microscope — These pollen grains taken on an SEM show the characteristic depth of field of SEM micrographs …   Wikipedia

  • Comparison of webmail providers — The following tables and gallery compare general and technical information for a number of webmail providers. Please see the individual products articles for further information. General information Name Owner First public release date Cost (US$) …   Wikipedia

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