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  2. Boundary-work - Wikipedia

    en.wikipedia.org/wiki/Boundary-work

    Boundary-work is part of science studies. In boundary-work , boundaries, demarcations, or other divisions between fields of knowledge are created, advocated, attacked, or reinforced. Such delineations often have high stakes for the participants, [ 1 ] and carry the implication that such boundaries are flexible and socially constructed .

  3. Divergent boundary - Wikipedia

    en.wikipedia.org/wiki/Divergent_boundary

    Continental-continental divergent/constructive boundary Oceanic divergent boundary: mid-ocean ridge (cross-section/cut-away view). In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.

  4. Boundary object - Wikipedia

    en.wikipedia.org/wiki/Boundary_object

    This concept has since been widely cited and the concept of a boundary object has been adopted in computer science (particularly computer supported cooperative work), information science, [4] and management, particularly when considering cross-disciplinary work and collaboration, [5] either within one organization or with the boundary object helping to focus the efforts of multiple organizations.

  5. Demarcation problem - Wikipedia

    en.wikipedia.org/wiki/Demarcation_problem

    In philosophy of science and epistemology, the demarcation problem is the question of how to distinguish between science and non-science. [1] It also examines the boundaries between science, pseudoscience and other products of human activity, like art and literature and beliefs.

  6. Grain boundary - Wikipedia

    en.wikipedia.org/wiki/Grain_boundary

    In materials science, a grain boundary is the interface between two grains, or crystallites, in a polycrystalline material. Grain boundaries are two-dimensional defects in the crystal structure , and tend to decrease the electrical and thermal conductivity of the material.

  7. Convergent boundary - Wikipedia

    en.wikipedia.org/wiki/Convergent_boundary

    A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction .

  8. Interface (matter) - Wikipedia

    en.wikipedia.org/wiki/Interface_(matter)

    The interface between matter and air, or matter and vacuum, is called a surface, and studied in surface science. In thermal equilibrium, the regions in contact are called phases, and the interface is called a phase boundary. An example for an interface out of equilibrium is the grain boundary in polycrystalline matter.

  9. Event horizon - Wikipedia

    en.wikipedia.org/wiki/Event_horizon

    The boundary beyond which events cannot ever be observed is an event horizon, and it represents the maximum extent of the particle horizon. The criterion for determining whether a particle horizon for the universe exists is as follows. Define a comoving distance d p as = ().