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  2. Scanning electron microscope - Wikipedia

    en.wikipedia.org/wiki/Scanning_electron_microscope

    Image of pollen grains taken on a SEM shows the characteristic depth of field of SEM micrographs M. von Ardenne's first SEM SEM with opened sample chamber Analog type SEM. A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons.

  3. Search engine marketing - Wikipedia

    en.wikipedia.org/wiki/Search_engine_marketing

    SEM and SEO both need to be monitored and updated frequently to reflect evolving best practices. In some contexts, the term SEM is used exclusively to mean pay per click advertising, [2] particularly in the commercial advertising

  4. Standard error - Wikipedia

    en.wikipedia.org/wiki/Standard_error

    Small samples are somewhat more likely to underestimate the population standard deviation and have a mean that differs from the true population mean, and the Student t-distribution accounts for the probability of these events with somewhat heavier tails compared to a Gaussian.

  5. Structural equation modeling - Wikipedia

    en.wikipedia.org/wiki/Structural_equation_modeling

    Structural equation modeling (SEM) is a diverse set of methods used by scientists for both observational and experimental research. SEM is used mostly in the social and behavioral science fields, but it is also used in epidemiology, [2] business, [3] and other fields. A common definition of SEM is, "...a class of methodologies that seeks to ...

  6. Environmental scanning electron microscope - Wikipedia

    en.wikipedia.org/wiki/Environmental_scanning...

    The environmental scanning electron microscope (ESEM) is a scanning electron microscope (SEM) that allows for the option of collecting electron micrographs of specimens that are wet, uncoated, or both by allowing for a gaseous environment in the specimen chamber.

  7. Security information and event management - Wikipedia

    en.wikipedia.org/wiki/Security_information_and...

    The acronyms SEM, SIM and SIEM have sometimes been used interchangeably, [19] but generally refer to the different primary focus of products: Log management: Focus on simple collection and storage of log messages and audit trails. [8] Security information management : Long-term storage as well as analysis and reporting of log data. [20]

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  9. Scanning transmission electron microscopy - Wikipedia

    en.wikipedia.org/wiki/Scanning_transmission...

    This increase in contrast significantly reduces, or even eliminates the need to stain biological samples. Resolutions of a few nm are possible in TEM, SEM and STEM modes. The low energy of the electron beam means that permanent magnets can be used as lenses and thus a miniature column that does not require cooling can be used. [42] [43]