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22-478: Metrominuto is a schematic pedestrian map based on the aesthetics of transit maps , marking the distances between the most important points of a city and the times an average person would take to walk those distances, designed to encourage citizens to get around on foot. Metrominuto was created in 2011 in Pontevedra , Spain by the local government, demystifying the time taken to get on foot from one point of

44-403: A chemical process uses symbols in place of detailed representations of the vessels, piping, valves, pumps, and other equipment that compose the system, thus emphasizing the functions of the individual elements and the interconnections among them and suppresses their physical details. In an electronic circuit diagram , the layout of the symbols may not look anything like the circuit as it appears in

66-406: A gate g {\displaystyle g} with in-degree i {\displaystyle i} and label l {\displaystyle l} is defined recursively for all gates g {\displaystyle g} . where each g j {\displaystyle g_{j}} is a parent of g {\displaystyle g} . The value of

88-415: A significant number of pages to schematic diagrams. Digital circuit In theoretical computer science, a circuit is a model of computation in which input values proceed through a sequence of gates, each of which computes a function. Circuits of this kind provide a generalization of Boolean circuits and a mathematical model for digital logic circuits. Circuits are defined by the gates they contain and

110-430: Is a circuit in which the edges to gates of depth i {\displaystyle i} comes only from gates of depth i + 1 {\displaystyle i+1} or from the inputs. In other words, edges only exist between adjacent levels of the circuit. The width of a levelled circuit is the maximum size of any level. The exact value V ( g ) {\displaystyle V(g)} of

132-665: Is a compromise between a purely abstract diagram (e.g. the schematic of the Washington Metro) and an exclusively realistic representation (e.g. the corresponding aerial view of Washington). In electrical and electronic industry, a schematic diagram is often used to describe the design of equipment. Schematic diagrams are often used for the maintenance and repair of electronic and electromechanical systems. While schematics were traditionally drawn by hand, using standardized templates or pre-printed adhesive symbols, today electronic design automation software (EDA or "electrical CAD")

154-442: Is called a child of g {\displaystyle g} . We suppose there is an order on the vertices of the graph, so we can speak of the k {\displaystyle k} th child of a gate when k {\displaystyle k} is less than or equal to the out-degree of the gate. The size of a circuit is the number of nodes of a circuit. The depth of a gate g {\displaystyle g}

176-422: Is defined on M i . {\displaystyle M^{i}.} The gates of in-degree 0 are called inputs or leaves . The gates of out-degree 0 are called outputs . If there is an edge from gate g {\displaystyle g} to gate h {\displaystyle h} in the graph G {\displaystyle G} then h {\displaystyle h}

198-782: Is often used. In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More recently, with the progress of computer technology, other representations were introduced and specialized computer languages were developed, since with the explosive growth of the complexity of electronic circuits, traditional schematics are becoming less practical. For example, hardware description languages are indispensable for modern digital circuit design. Schematics for electronic circuits are prepared by designers using EDA ( electronic design automation ) tools called schematic capture tools or schematic entry tools. These tools go beyond simple drawing of devices and connections. Usually they are integrated into

220-453: Is the length of the longest path in G {\displaystyle G} beginning at g {\displaystyle g} up to an output gate. In particular, the gates of out-degree 0 are the only gates of depth 1. The depth of a circuit is the maximum depth of any gate. Level i {\displaystyle i} is the set of all gates of depth i {\displaystyle i} . A levelled circuit

242-871: Is then usual to consider a family of circuits ( C n ) n ∈ N {\displaystyle (C_{n})_{n\in \mathbb {N} }} , a sequence of circuits indexed by the integers where the circuit C n {\displaystyle C_{n}} has n {\displaystyle n} variables. Families of circuits can thus be seen as functions from M ∗ {\displaystyle M^{*}} to M {\displaystyle M} . The notions of size, depth and width can be naturally extended to families of functions, becoming functions from N {\displaystyle \mathbb {N} } to N {\displaystyle \mathbb {N} } ; for example, s i z e ( n ) {\displaystyle size(n)}

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264-530: The United Kingdom and Zaragoza , Seville , Cádiz , Salamanca , Granada , Jerez de la Frontera , A Coruña and Pamplona in Spain. Schematic For example, a subway map intended for passengers may represent a subway station with a dot. The dot is not intended to resemble the actual station at all but aims to give the viewer information without unnecessary visual clutter. A schematic diagram of

286-402: The circuit is the value of each of the output gates. The labels of the leaves can also be variables which take values in M {\displaystyle M} . If there are n {\displaystyle n} leaves, then the circuit can be seen as a function from M n {\displaystyle M^{n}} to M {\displaystyle M} . It

308-454: The city to another in a simple and easy reading way, within the framework of an overall strategy to promote urban walkability . Since its creation, they have distributed Metrominuto as a paper hand map, put up on public transport information panels, installed as an information sign all around the city, developed as a free mobile app and promoted using slogans such as “Move with your own energy” or “You live better on foot”. Metrominuto along with

330-494: The details that would be repeated on each phase of a three-phase system, showing only one element instead of three. Electrical diagrams for switchgear often have common device functions designate by standard function numbers . Another type of diagram used for power systems is a three-line diagram . For analysis purposes of a power system, from the one-line diagram, if the system is balanced, an equivalent per-phase (or single-phase ) schematic diagram can be obtained. If all of

352-407: The graph are called gates . For each gate g {\displaystyle g} of in-degree i {\displaystyle i} , the gate g {\displaystyle g} can be labeled by an element ℓ {\displaystyle \ell } of L {\displaystyle L} if and only if ℓ {\displaystyle \ell }

374-564: The one-line diagram, three different per-phase schematic diagrams are obtained, known as sequence diagrams : positive sequence diagram , negative sequence diagram , and zero sequence diagram . Each of these diagrams can be represented as an impedance diagram or as an admittance diagram. Schematic diagrams are used extensively in repair manuals to help users understand the interconnections of parts, and to provide graphical instruction to assist in dismantling and rebuilding mechanical assemblies. Many automotive and motorcycle repair manuals devote

396-484: The parameters are represented as impedances and voltage sources, the equivalent per-phase schematic diagram is called an impedance diagram . If all of the parameters are represented as admittances and current sources, the equivalent per-phase schematic diagram is called an admittance diagram . If the power system is unbalanced, but it is linear (or can be approximated by a linear system), then Fortescue's theorem ( symmetrical components ) can be applied. In this way, from

418-496: The physical world: instead of representing the way the circuit looks , the schematic aims to capture, on a more general level, the way it works . This may be contrasted with a wiring diagram , which preserves the spatial relationships between each of its components. Schematics and other types of diagrams, e.g., A semi-schematic diagram combines some of the abstraction of a purely schematic diagram with other elements displayed as realistically as possible, for various reasons. It

440-894: The urban transformation of Pontevedra into a pedestrian friendly and universally accessible city has won many national and international awards such as the European INTERMODES Urban Mobility Award in 2013 and the 2014 Dubai International Best Practices Award for Sustainable Development awarded by UN-Habitat in partnership with Dubai Municipality . Metrominuto has been introduced, in their own customized layout, in many European cities such as Toulouse in France, Florence , Ferrara , Modena and Cagliari in Italy, Poznań in Poland, Belgorod in Russia, Angel in

462-494: The values the gates can produce. For example, the values in a Boolean circuit are Boolean values, and the circuit includes conjunction, disjunction, and negation gates. The values in an integer circuit are sets of integers and the gates compute set union, set intersection, and set complement, as well as the arithmetic operations addition and multiplication. A circuit is a triplet ( M , L , G ) {\displaystyle (M,L,G)} , where The vertices of

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484-427: The whole design flow and linked to other EDA tools for verification and simulation of the circuit under design. Programmable logic controllers (PLC) can be programmed using ladder diagrams . In electric power systems design, a schematic drawing called a one-line diagram is frequently used to represent substations , distribution systems or even whole electrical power grids. These diagrams simplify and compress

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