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  2. N2 chart - Wikipedia

    en.wikipedia.org/wiki/N2_Chart

    The N 2 chart or N 2 diagram (pronounced "en-two" or "en-squared") is a chart or diagram in the shape of a matrix, representing functional or physical interfaces between system elements. It is used to systematically identify, define, tabulate, design, and analyze functional and physical interfaces.

  3. Cockroach - Wikipedia

    en.wikipedia.org/wiki/Cockroach

    When the carbon dioxide level in the insect rises high enough, valves on the spiracles open and carbon dioxide diffuses out and oxygen diffuses in. The tracheal system branches repeatedly, the finest tracheoles bringing air directly to each cell , allowing gaseous exchange to take place.

  4. Food chain - Wikipedia

    en.wikipedia.org/wiki/Food_chain

    Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...

  5. Three levels of leadership model - Wikipedia

    en.wikipedia.org/wiki/Three_levels_of_leadership...

    The three levels referred to in the model's name are Public, Private and Personal leadership. The model is usually presented in diagram form as three concentric circles and four outwardly directed arrows, with personal leadership in the center. The first two levels – public and private leadership – are "outer" or "behavioral" levels ...

  6. Kerberos (protocol) - Wikipedia

    en.wikipedia.org/wiki/Kerberos_(protocol)

    The AS checks to see whether the client is in its database. If it is, the AS generates the secret key by hashing the password of the user found at the database (e.g., Active Directory in Windows Server) and sends back the following two messages to the client: Message A: Client/TGS Session Key encrypted using the secret key of the client/user.

  7. Functional block diagram - Wikipedia

    en.wikipedia.org/wiki/Functional_block_diagram

    Functional block diagram of the attitude control and maneuvering electronics system of the Gemini spacecraft. June 1962. A functional block diagram, in systems engineering and software engineering, is a block diagram that describes the functions and interrelationships of a system. The functional block diagram can picture: [1]

  8. Jablonski diagram - Wikipedia

    en.wikipedia.org/wiki/Jablonski_diagram

    The changes between these levels are called "transitions" and are plotted on the Jablonski diagram. Radiative transitions involve either the absorption or emission of a photon. As mentioned above, these transitions are denoted with solid arrows with their tails at the initial energy level and their tips at the final energy level.

  9. Systems modeling language - Wikipedia

    en.wikipedia.org/wiki/Systems_modeling_language

    SysML diagrams collage. The systems modeling language (SysML) [1] is a general-purpose modeling language for systems engineering applications. It supports the specification, analysis, design, verification and validation of a broad range of systems and systems-of-systems.