What is Construction: Definition and 246 Discussions

Construction is a general term meaning the art and science to form objects, systems, or organizations, and comes from Latin constructio (from com- "together" and struere "to pile up") and Old French construction. To construct is the verb: the act of building, and the noun is construction: how something is built, the nature of its structure.
In its most widely used context, construction covers the processes involved in delivering buildings, infrastructure and industrial facilities, and associated activities through to the end of their life. It typically starts with planning, financing, and design, and continues until the asset is built and ready for use; construction also covers repairs and maintenance work, any works to expand, extend and improve the asset, and its eventual demolition, dismantling or decommissioning.
As an industry, construction accounts for more than 10% of global GDP (6-9% in developed countries) and employs around 7% of the global workforce - over 273m people. The output of the global construction industry was worth an estimated $10.8 trillion in 2017.

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  1. P

    Construction of asymptotic states in QFT

    Could anyone give me a good reference for construction of asymptotic states in QFT. Usually one assumes that long before and long after collision particles almost don't interact because they're spatially separated. This statement is based on the assumption that particles might be represented as...
  2. S

    Constructing the Real Numbers through Infinite Decimal Expansions

    I was looking at the construction of the real number system. I know dedekind cuts can be used(completely worthless in terms of understanding I think) and Cauchy sequences can be used (I wish my analysis book used them) but I would like to see a construction based on infinite decimal...
  3. H

    Constructing a 2D Matrix for Solving Equations with Multiple Unknowns

    I am trying to figure out how you would write out a matrix for the solution to an equation such as the following: \alpha x^{rr}-(2\alpha+2\gamma) x^r+(\alpha+\gamma) x^i+(\beta+\gamma) x^{br}-\beta z^r -(\beta+2\eta) z^b+(\beta+\eta) z^i +\eta z^{bb}=0 where alpha, beta, gamma, and eta are...
  4. E

    Finding Finite Series for Euler's Number (e)

    well, i kno that e is derived from (1+(1/n))^n, as n goes to infinity, but i want to find a finite series . if i plot a curve like this on a graph, then take its derivative, i can tske a value of e.
  5. A

    Solving a Construction with 3 Degrees of Freedom

    Hey, For a school project we have a construction as indicated in the attached figure. The idea is that point A is able to move in 3 degrees of freedom, but the position, velocity and acceleration of this point is known. The length ||A-P1|| is fixed and is connected to a bell crank that is...
  6. E

    Is it easier to prove that pi is transcendental or not constructible?

    hi. I've been working on a project lately about pi. and its unconstructiveness doesn't make sense. can you think of a way to possibly do this?
  7. C

    Construction of an atlas

    Hello, I want to show the following little exercise: If we have a manifold M and a atlas A of M, s.t. for all coordinate maps x,y \in A: det \; (d(x\circ y^{-1})<0). Then there is a atlas A' s.t. for all x',y': (det \; d(x\circ y'^{-1})>0) I try to change the coordinate maps by...
  8. M

    Constructing Tangent Circles for an S-Shaped Design

    Hello everybody, i am new to this forum, i am not a physicist not a mathematician, just an architect and i have a geometrical problem that has drove me crazy. I thought to sign in JUST in case someone can help find a solution. I am working with autocad, that means using geometry consructions...
  9. JeremyEbert

    Geometric construction of the square root

    Is anyone familiar with this method of determining square roots? http://www.cs.cas.cz/portal/AlgoMath/Geometry/PlaneGeometry/GeometricConstructions/SquareSquareRootConstruction.htm I have an equation that I'm working on that expands on this a bit and I'd love some feedback.
  10. D

    Truth Value & Set Construction: Analyzing A disjoin union B

    When I say A disjoin union B, does it have a truth value, like A subset B, or is it a set construction notation, like union?
  11. P

    Interacting QFT - construction of states

    Let's consider self-interacting scalar field described by action: S = \int d^4 x \frac{1}{2} \left[ \partial_\mu \phi \partial^\mu \phi - m^2 \phi^2 - \frac{\lambda}{4!}\phi^4\right] Using relation between Poisson bracket in classical mechanics and comutators of quantum operators we...
  12. F

    What exactly does a Construction Engineer do?

    Hey everyone! I am currently looking into engineering and I the school I will be attending has Construction Engineering. I have been searching and searching and really can't seem to find a very good description of the career field. i have read about construction management and what little I...
  13. M

    LEO Spacecraft Construction

    I am looking for any information on the feasibility of spacecraft construction in LEO. Does anybody know of any papers or lectures on the subject. Any Help in appreciated, thanks!
  14. J

    First brillouin zone construction

    Hi All, Is there any software or program to show the first brillouin zone and the miller index of zone boundary plane ? I use Mercury, but there is no such function.
  15. S

    Propeller of a ship - construction

    Hi guys I am into construction things, I have learned to construct many things now i am into propellers so can anyone tell me how to construct/ design a simple basic working propeller. How to construct the blades, at what angle, pitch thickness, etc etc... any e-book or site where i can i find...
  16. tom.stoer

    Quantization = construction of quantum theories based on the classical limit?

    I have a question regarding quantization. In most cases one never starts with a quantum theory, but always writes down a classical expression, goes through quantization, implementation of constraints (Dirac, BRST, ...), construction of Hilbert space, inner product, measure of an path integral...
  17. A

    How do I construct a matrix that satisfies certain conditions?

    Homework Statement I am having trouble building a matrix in my post so I have attached the question (2.27) and my work thus far. I need to develop a matrix H which when multiplied by a vector v produces a new matrix U with a constant 1/2 applied to certain terms of the matrix. Please see the...
  18. I

    Constructing Matrix Representations for N-Fermion Spaces

    I'm considering a physical system of n-species of fermions. The creation and annihilation operators satisfy \{b_i^-,b_j^-\} = 0 = \{ b_i^+ , b_j^+ \}, \quad \{ b_i^- , b_j^+ \} = \delta_{ij} I want to construct the matrix representations of the state vectors and operators. I do it...
  19. W

    Any good reference on construction of irreducible representations of SU(N)?

    how to construct an irreducible representation of SU(3)?
  20. L

    Construction of Reeb Graph for Critical Points on Contours

    Hi. I have critical points are plotted on contours, I just need to construct Reeb graph for it. Any body has got idea to do it? I need algorithms or at least ready software. Please help me. Thanks. Lutas
  21. K

    Road construction method and estimate

    [b]1. we have 1 road length 10km x 8m is given to do for 6 months. the works was given a volume of Embankment 80,000m3 and the volume of subase 24000m3 and the volume of base course 16000m3. so what can we do to make the road and estimate the cost and describe the work of tool to use. (just...
  22. M

    Superstructure construction with aluminum paneling

    I’m looking for information regarding the use of composite aluminum sandwich paneling in the construction of superstructures. I have found quite a lot of information regarding the implementation of foam cores with glass skins in place of solid fiberglass; however I have been unable to find...
  23. S

    What resources can help with designing a stator ring for an AC motor?

    Hello all, I am currently working on a project that requires a stator ring like the ones found in electric motors where there are 2-3phases of electromagnetic coils placed in a circular fashion with a pole pointing towards the center (look at picture below). The coils would be powered by AC...
  24. jegues

    Transformer Induction coil (COIL CONSTRUCTION)

    Hello all, I'm currently working on a project and I have a question in regards to creating an efficient induction coil for our circuit. Without going into the specific details of the circuit(We aren't given the details anyways, just the circuit itself), it basically imitates a transformer...
  25. D

    Is there a name for this construction?

    So I was talking with a friend about a problem and noticed the following construction arose naturally: For a category C, let F(C) be the category where objects are objects in C, arrows are finite lists of arrows, identity is the list {id}, and composition is defined by tensoring as follows...
  26. B

    Construction of an equivalent dielectric tensor

    Homework Statement A medium is described by the response functions \varepsilon (\omega ) and {\mu ^{ - 1}}(\omega ) in \textbf{D} = \varepsilon (\omega )\textbf{E}, \textbf{H} = {\mu ^{ - 1}}(\omega )\textbf{B}. Construct the equivalent dielectric tensor {K_{ij}}(\omega ,\textbf{k}) in...
  27. O

    Set theory: Axioms of Construction

    Homework Statement We're asked to prove that a few constructions of the sets a,b are themselves sets, stating which axioms we use to do so. a) a\b b)the function f:a->b c)the image of f Homework Equations The following standard definitions of axioms of construction...
  28. J

    Construction of the Real Numbers

    Does anyone have or know of any good books that cover the construction of the real numbers via cauchy sequences? I would appreciate any recommendations. Thanks!
  29. N

    Unpacking Ito's Lemma: A Guide to its Construction

    Does anyone know a document that explains the construction of Ito's lemma? In most financial mathematics textbooks, it's poorly motivated. Thanks!
  30. B

    C/C++ C++ newbie qu: grid construction for finite difference

    Hello everyone: I am a C++ newbie; I am interesting in using C++ in my work on coupled fluid flow-chemical reaction problems. I apologize in advance for what is probably a very simple question. I would very much appreciate any help to get me on the right track! My goal is to come up with...
  31. P

    Momentum Operator Construction

    Quick question about how Schrodinger constructed the momentum operator. I understand that \widehat{H} in the wave equation is the sum of the kinetic and potential operators, using the form H=T+V. The kinetic energy can be expressed by T=p^2/2m, and that's the last part I can follow. Most...
  32. R

    Calculate Torque/Power for Rotating Tube & Rectangular Parallelepiped

    I want to calculate the torque of the construction or the needed Power (Watt) to rotate it. The construction is a tube and on top of tube is stuck a rectangular parallelepiped: Tube: inner diameter=d=92mm, outter diameter=D=102mm, lenght=L=3000mm, mass=12.34kg Rectangular...
  33. T

    Compass and straightedge angle construction

    Ok so couple questions, what is the use of this method of creating angles? does being able to construct an angle using only this method give that angle any special properties in physical situations, or is it just a matter of being a backup plan in case you for some reason happen to have a...
  34. C

    Can You Prove the Time Bound for ANDing N Signals with Varying Arrival Times?

    Homework Statement There are N signals that must be all ANDed together using two-input AND gates, and produce a result as fast as possible. The N signals arrive at different times (T1 to TN) An AND gate first waits for both input signals to arrive, and then takes 1 second to output the...
  35. A

    Construct Matrix P & Find Trace/Eigenvalues - Can Anyone Help?

    Am really lost on this one: Suppose X is a full rank nxp matrix. Construct the matrix: P = I - X((X'X)^-1)X' Where X' is the transpose of X. I then have to find the trace and eigenvalues of P. Can anyone help?!
  36. K

    Construction of minimum norm solution matrix

    Homework Statement Consider the linear system of equations Ax = b b is in the range of A Given the SVD of a random matrix A; construct a full rank matrix B for which the solution: x = B^-1*b is the minimum norm solution. Also A is rank deficient by a known value and diagonalizable...
  37. T

    Van der Waals equation of state and Maxwell construction

    Hello people :), I have a question because I couldn't understand something written in Schwabl's book of Statistical mechanics. Can you please explain why we in the Van der Waals equation of state choose a constant pressure under the critical temperature. I understood the part that we want to...
  38. E

    Construction of lines from points

    After a rather interesting discussion in #math on freenode, I'm perplexed by the fact that there is no way to construct lines from points. For example, I initially thought of constructing a line between 0 and 1 by repeatedly dividing into two smaller halves, eg: 0,1 0,0.5,1 0,0.25,0.5,0.75,1...
  39. W

    Type of Wood for Model Airfoil Construction

    I am constructing a few model airfoils for some low speed wind tunnel tests. I will be using wooden ribs covered in Mylar. I was just wondering what kind of wood is best for this situation: balsa, basswood, or a different kind of wood. Thank you
  40. D

    Construction of a Basis

    Homework Statement Prove that any collection of vectors which includes \theta (zero vector or null vector)is linearly dependent. Thus, null vector cannot be contained in a basis. The Attempt at a Solution Well, I know that in order for a collection of vectors to to be linearly...
  41. Ivan Seeking

    Oregon Construction Liens: Protect Yourself Now

    I was just reading the contract for some work that we are having done. Get this, under Oregon Law, apparently I have no way to protect myself against a lien filed by suppliers to my contractor. If I pay the contractor, but he doesn't pay his suppliers, they can come after me! What a load of...
  42. M

    Shed construction /w a plant roof

    Hey, I am building a storage shed in the backyard and would like to build a flat roof which houses plants instead of a shingle roof. The slope of the roof will be around 1 foot rise per 6 feet run. The dimensions of the building are, 12 feet by 16 feet. floor is built with 2x10's and the...
  43. R

    How Do You Calculate Motor and Drive Specifications for a Construction Lift?

    Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...
  44. R

    Design a Construction Lift: Urgent Calculation Solution

    Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...
  45. S

    Sound isolation capacity of an idealized wall construction

    I'm looking to understand how to estimate the sound isolation capacity of a wall structure. With rising degree of detail will probably come an exponantial increase in complexity. I'm looking to start of, euhm,... gently. :shy: What I've gathered so far: -The impedance of the wall seems to take...
  46. P

    Please help with this construction question im really stuck

    please help with this construction question I am really stuck! question is:- a reinforced concrete beam is to be 700mm deep. the minimum width of beam is to be used and 20mm size aggregate has been specified. three 25mm diameter bars have been calculated for tension reinforcement and three 16mm...
  47. T

    Construction of the Tensor Product

    For some reason, tensors seem to be a terribly mysterious topic, mentioned all the time, but rarely explained in clear terms. Whenever I read a paper which uses them, I get the feeling I'm listening to a blind man talk about an elephant. They have to do with multilinear maps. They are a...
  48. Fredrik

    Construction of a Hilbert space and operators on it

    When quantizing a classical field theory, e.g. Klein-Gordon theory, the Hilbert space of one-particle states is taken to be a set of equivalence classes of (Lebesgue) measurable and square integrable solutions of the classical field equation, but how do you use the classical theory to construct...
  49. I

    Construction Management - Questions for Engineers & Project Managers

    Hi, I have a few questions for anyone who is currently working in construction as an engineer or project manager. I'm an HVAC/Building controls technician/installer and I want to pursue a career in the managerial side of the business. I only have an AS degree in electromechanical...
  50. A

    What is the definition of R in the tensor product construction?

    Hello, So I'm trying to understand the construction of the tensor product of 2 vector spaces as stated in the http://en.wikipedia.org/wiki/Tensor_product" . Now, in the article it states that the tensor product of two vector spaces V and W is the quotient space F( VxW )/R (F( VxW ) being the...
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