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. Hardik Batra

    Transformer Construction

    WHY in step up transformer, the number of turns are less in primary and copper wire is thick. Whereas in secondary number of turns are more and copper wire is thin. In step-down transformer the situation is reversed. I want the reason for this?
  2. A

    How to Define a Constraint Using If-Then-Else for Vegetable Growth?

    How can we define a constraint saying: if b is larger than zero then y has to equal 1 if b is equal to zero then y has to equal 0 ? It concerns the following problem: b[i][k] = amount of vegetable i growing on patch k y[i][k] = 1 if vegetable i is grown on patch k = 0 otherwise So...
  3. D

    MHB Cantor ternary set, construction

    Explain why all the end points of the closed intervals that comprise $C_n$ are in the Cantor set $C_n$. I understand why this is true but I don't know how to explain it.
  4. T

    Up/down electron gun construction?

    up/down electron gun construction?? Greetings! I'm working on a project that Requires a roughly equal number of up and down spin electrons to be injected into a (vacuum or ATP) chamber. Is there a common device that does this? If not, would it be possible to build one and how would it work...
  5. D

    Dot Product/Cross Product Interpretation, Geometric Construction

    Homework Statement Given the nonzero vector a ε ℝ3, a\dot{}x = b ε ℝ, and a × x = c ε ℝ3, can you determine the vector x ε ℝ3? If so, give a geometric construction for x. Homework Equations a\dot{}x = ||a||||x||cos\Theta The Attempt at a Solution I'm not really certain what it is...
  6. K

    Probability, There are 20 laborers to four different construction jobs

    Homework Statement Please help me in my attempt: There are 20 laborers to four different construction jobs including 4 workers of ethnic minority. The first job required 6 laborers; the second, third, and fourth utilized 4, 5, and 5 laborers, respectively. What is the probability that...
  7. C

    Construction of a probability space.

    Q. Exhibit (if such exists) a probability space, denoted by (Ω, A, P[·]), which satisfies the following. For A1 and A2 members of A, if P[A1] = P[A2], then A1 = A2. Answer: A = {Ω, ∅}, P[Ω] = 1 and P[∅] = 0. Is this a valid answer to the above question?
  8. C

    Time machine/time travel device construction ideas

    Anyone have any ideas how I can make one? Please discuss below!:biggrin: The only thing I know so far is that to time travel you have to go faster than the speed of light...
  9. E

    Can I Build a DIY LN2 Cryocooler for Experimental Purposes?

    I was wondering if anyone could give me guidance on the construction of a cryocooler in a DIY setting. As a tinkerer, builder, and a chemistry major with an interest and dabbling in mechanical / system engineering, I want to try my hand at building a cryocooler for liquefaction of small amounts...
  10. W

    Error in Algebraic Construction or Computational Translation?

    I have an equation that I've been trying to solve. I manipulated it until I had a=f(d) and then did by best to put it into a format the computer recognizes. However when I went back to check the results against the unsimplified version of the equation, they didn't work out as they should have...
  11. T

    Jacob's Ladder construction help.

    So, I'm planning on making a Jacob's Ladder. I've considered the high voltage issues and such, and now I'm doing the actual design process. So, a couple of questions. The overwhelming design that I've seen online has been to simply take a high voltage transformer and couple it to the actual wire...
  12. K

    Electromagnet construction and off-axis field calculation with iron core

    Hi, I'm wondering if anyone has any sources for off-axis point calculation for multiple current carrying loops that contain a soft iron core. I have been using this resource so far and I can figure out how to include multiple loops. How would I approach these calculations with an iron core...
  13. A

    Prove the impossibility of construction with ruler and compass the numbers:

    Homework Statement ∛4 ∛5 ∛3 and ∛a Homework Equations The Attempt at a Solution I have started with the problem but i feel like I'm off track. I'll upload a pic of the work so far.
  14. H

    Modular construction of genomes allows rapid evolution

    Hi, I read the following recently in a book on genetics: The modular construction of genomes has allowed the relatively rapid evolution of biological complexity. I could'nt understand what the modular construction of genomes mean. Is it referring to genes which make up a genome?
  15. A

    How can I construct a Riemann surface from branch data?

    I can't understand how to recover a Riemann surface from the branch data. In particular, given a group acting on the Riemann sphere with some points removed, how can I construct a Riemann surface?
  16. Τ

    Construction of a Circuit

    Homework Statement You are given a battery of 220 V and a radio device that requires 1600 W to run. You are also given four resistors: three 3 Ω resistors and one 20 Ω resistor. What circuit configuration will allow the radio device to run without getting fried? The Attempt at a Solution...
  17. D

    Basement Construction Methods - Basement Design

    Hi all, I am working a design project for a geotechnical engineering subject and it goes as follows: A 6 storey building requires a 12m deep basement comprising 3 levels of car park with plan dimensions of 50m by 50m and is to be constructed in a medium clay. The water table maximum level...
  18. T

    Construction of a levitating bed

    A friend sent me this link, and I thought others may enjoy it. I can't imagine it's too comfortable though. http://imgur.com/a/VWhr7
  19. S

    Number systems: construction of rational numbers

    Homework Statement let a and b be rational numbers if a>b>0 show that there exists a natural number n, which can be considered rational as well, st nb>a Homework Equations The Attempt at a Solution I was trying using the peano theorem of natural numbers define set of...
  20. H

    What Are the Best US Steel Manufacturers for Heavy Equipment Fabrication?

    Hi all, I am looking for US steel manufacturers/fabricators for fabrication of heavy equipment. Typically 200-2000kgs per weldment. 5-50mm mild steel. 2-10 pieces per order. Machines needed: large bending press. horizontal milling machine. CNC drill. Thanks. Huntoon
  21. M

    What are the different types of woods used in construction?

    I need a list of different types of woods used in construction and their properties. I can't find them on any Construction materials and testing books. I hope somebody would give me a direct link of a useful site. Thanks
  22. K

    Construction of a Timer Switch

    Hi, I'd like to do a small design project. When I sleep, I switch on my mosquito repellant for about 8 hours. Sometimes I forget switching it off too. Such long durations are little poisonous and generally not required. What I plan to do is to make a timer with a dial from 0 min to 60 min...
  23. M

    Pipe-Line Construction: Dimensional Analysis & Pipe Roughness

    I'm designing a pipe-line and need to choose a specific value for pipe roughness. I'm trying to do dimensional analysis to find the needed pi groups. That's what I did ε (roughness of the pipe) = fcn(V,D, ρ μ) V = Velocity D = Diameter ρ = density μ = viscosity Is...
  24. A

    Construction of Hamiltonian for interacting optical fields

    Hi. I am going to start my MSc in a couple of months majoring in nonlinear quantum optics. I have a good basic in quantum mechanics, but have never looked at quantum optics before. My topic will be to investigate quantum properties of nonlinear optical coupler but i have problem with the...
  25. I

    Construction of a magnetic field over radioactive waste

    Hi all, Was reading articles on neutron stars and black holes when I started thinking about magnetic fields. I think it is a fact that magnetic shields on Earth block out the harmful radioactive solar flares that come from the sun. So in the article i was reading it mentioned something about...
  26. T

    2D construction made of square blocks. Breaking by gravity

    Hi, Imagine: a computer program like 2D Lego with only 1 type of block (a small square one) with which you can create constructions. Blocks can be placed on an invisible grid. There is gravity, and boxes can't fly, so you need to build any construction from the ground up. Boxes are always...
  27. M

    Extract the laser from a mouse and use it for construction of a probe

    Background I am currently doing a project that requires me to construct a probe which dentists use to transmit laser light to a patient's teeth to determine if the teeth is vital or not. Wanna know if it is feasible for me to extract the laser from an optical mouse and use it to construct...
  28. L

    Abstract Algebra: Ring Isomorphism Construction

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  29. F

    Deterministic Finite State Automaton Construction

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  30. A

    Constructing a Sequence to Show the Existence of a Limit

    Hi, Homework Statement V is a non-empty, upper bounded subset of R. Show that a sequence (v_n)_{n \geq 0} in V exists such that: 1)v_0 \leq v_1 \leq ... and 2) the limit of the sequence is sup V. (Hint: use a recursive construction) Homework Equations The Attempt at a Solution...
  31. A

    What is the Construction of R using Equivalence Classes of Cauchy Sequences?

    This proof I think is related to our construction of R in class using equivalences classes of Cauchy sequences: Let a\inR, then there exists a sequence b s.t. {b_n}\inQ for all n\inN and lim {b_n} = x. Here's my attempt: Let [{b_n}]\inR be the equivalence class of all Cauchy sequences...
  32. A

    Perturbative Construction of General Relativity

    I remember reading a long time ago that there was a straightforward (but operationally difficult) way of constructing General Relativity from the Linear Field Equations. Essentially you start with the Linear Field Equations solution and then generate a stress energy pseudo-tensor for this...
  33. F

    Understanding Huygens' Constructions in Photonics

    Hi there I'm having some real trouble answering photonics questions that require the use of Huygens construction. For example if I was asked Compare with the help of Huygen's constructions the propagation of o- and e- components of light through a material with ne and no are 1.55336, and...
  34. D

    The arm of a crane at a construction site is 15.0 m long

    Homework Statement The arm of a crane at a construction site is 15.0 m long, and it makes an angle of 15.8 with the horizontal. Assume that the max- imum load the crane can handle is limited by the amount of torque the load produces around the base of the arm. What maximum torque can...
  35. E

    Construction Drawing Help: Types of Guide Ways & Cross Carriage of Lathe

    Homework Statement can anyone help me:smile: :i need a construction drawings for : 1-Types of Guide ways and wear compensation methods. 2- Cross Carriage of the center lathe with the tool post. please answer me as quick as you can:uhh: Homework Equations The Attempt at a Solution
  36. Shackleford

    The three famous geometric construction problems

    We're covering this in my History of Mathematics class. I'm not entirely sure what they're asking.
  37. D

    Recursive definition construction

    Homework Statement Construct a recursive definition for the following: The number of ways to stack n red, white, green, and blue poker chips so that there are no two consecutive blue poker chips. The attempt at a solution The number of possible combinations is 4^n minus the number of...
  38. Ivan Seeking

    The 405 fwy in Los Angeles will be closed for construction work. For

    The 405 fwy in Los Angeles will be closed for construction work. For anyone who has to drive in the area, what a nightmare this will be! Last night on the Tonight Show, Jay Leno actually played a video of alternate routes...
  39. L

    Explicit construction of SO(n)

    I would love to know how we can contruct SO(n) matrices. I know we get them from Clifford algebras somehow. I am especially interested in SO(8). Could anybody help? thank you
  40. T

    Ferrofluid Display Cell construction- hydrophilic surface application help

    Greetings everyone, I'm constructing a ferrofluid display cell using FerroTech EFH1 ferrofluid inside of a round bottom pyrex beaker. The ferrofluid is oil based, so it is not hydrophilic. The liquid that the ferrofluid will be suspended in is Magnesium Citrate (a household laxative... and no...
  41. M

    Construction of Hamiltonian from Casimir operators

    In Greiner & Muller's 'Quantum Mechanics: Symmetries' (section 3.5) they explain that where a system possesses a symmetry, the corresponding Hamiltonian must be 'built up' from the Casimir operators of the corresponding symmetry group. Does anyone know of a reference where this is gone into...
  42. L

    Relations of an affine space with R^n , and the construction of Euclidean space

    (This could maybe turn out to be a little longer post, so I'll bold my questions) Hi, I was reading a little about affine geometry, and something bothered me. Namely, in some books, there were some paragraphs that were written like "blabla, let's observe an affine plane for instance, and...
  43. S

    Construction Cranes Radio Frequency Induction

    Can anyone explain why cranes in construction sometimes experience induced currents from antennas radiating from distances of up to several Kilometers. I have looked into the phenomenon several times, and have not been able to find a study or baselines to follow. I have a basic understanding...
  44. S

    Construction Cranes EM Induction

    Can anyone explain why cranes in construction sometimes experience induced currents from antennas radiating from distances of up to several Kilometers. I have looked into the phenomenon several times, and have not been able to find a study or baselines to follow. I have a basic understanding...
  45. M

    What is a maxwell construction.?

    what is a maxwell construction...? What is a maxwell construction when applied to van der Waals isotherms?? please help, i really don't understand it. Thanks in advance
  46. Y

    How to Eliminate Visible Lines in Aluminum Frame Corners?

    I am trying build a frame in mass production with the aluminum profiles but always have the problem at the mating region of the profiles. As you see in the picture, there is always a line at the mating region of the profiles. Is there anyone who can help me about this problem? Do you know...
  47. B

    Fast Construction of Irreducible Polynomials of degree n over any Finite Field

    Hello, I'm currently doing an undergrad project on this topic and I was wondering if any of you guys know what is the fastest algorithm (asymptotically) that has been discovered so far, for such purpose. Here is paper by Shoup (1993) which gave the fastest algorithm up to then...
  48. B

    Fast Construction of Irreducible Polynomials of degree n over any Finite Field

    Hello, I'm currently doing an undergrad project on this topic and I was wondering if any of you guys know what is the fastest algorithm (asymptotically) that has been discovered so far, for such purpose. Here is paper by Shoup (1993) which gave the fastest algorithm up to then...
  49. B

    The Bolzano Weirstrass Proof by Construction

    Is this good? thanks Proof: let S be an infinite bounded set in \Re then \exists real numbers a, b such that S is in [a, b] One of the intervals, [a, (a+b)/2] or [(a+b)/2, b] contains an infinite set of members of S. Let's choose one with this property and call it [a_1, b_1] Continuing in...
  50. B

    The Bolzano Weirstrass Proof by Construction

    My LATEX editor on this page just didn't want to save the changes. Please see this link https://www.physicsforums.com/showthread.php?p=3204206#post3204206" Stephen, I added the word infinite to my set S.
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