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. evinda

    MHB How can we find a generator of the multiplicative group of a finite field?

    Hello! (Wave) I want to construct the field $\mathbb{F}_{3^3}$ and find a generator of $\mathbb{F}_{3^3}^{\star}$. I thought to consider a $t \in \mathbb{F}_3[x]$ where $t$ is irreducible and $\deg t=3$. So we consider $t=x^3+x^2-x+1$. Let $b$ be a root of $t$. Then $b^3+b^2-b+1=0...
  2. davenn

    Stargazing The James Webb Space Telescope construction

    cool article on the progress of the JWST constructionhttp://www.space.com/31838-james-webb-space-telescope-mirror-assembled.html?cmpid=NL_SP_weekly_2016-2-05Dave
  3. W

    Metric for the construction of Mercator map

    Homework Statement The familiar Mercator map of the world is obtained by transforming spherical coordinates θ , ϕ to coordinates x , y given by ##x = \frac{W}{2π} φ, y = -\frac{W}{2π} log (tan (\frac{Θ}{2}))## Show that ##ds^2 = Ω^2(x,y) (dx^2 + dy^2)## and find ##Ω## Homework Equations...
  4. W

    Construction of an affine tensor of rank 4

    Homework Statement In En the quantities Bij are the components of an affine tensor of rank 2. Construct two affine tensors each of rank 4, with components Cijkl and Dijkl for which ∑k ∑l Cijkl Bkl = Bij + Bji ∑k ∑l Dijkl Bkl = Bij - Bji are identities. Homework Equations The Attempt at a...
  5. E

    Automotive Seeking quote for construction of motorized camera car

    I'm looking to find someone who can give me a quote on cost to make tracks and a motorized camera car that can run along the tracks at a specified speed. I can provide more details about the project if anyone is interested in putting together figures to give me an idea what this would cost, so I...
  6. L

    Forces in symmetrical construction

    Homework Statement We have a slab with uniform distrubuted load on it W. All dimensions. [/B] I'm looking for the force on the bolts and force on the hook contact surface. The Attempt at a Solution My way to do it is to reduce the problem for 2D. But the problem is that I'm not sure how to...
  7. T

    Motorcycle Helmet Construction

    Hi everybody, I am new in this forum, and i have to say that i am not the best in physics but, i always loved playing with paint, carbon fiber and fiberglass etc... I had an idea of trying to make a Helmet with a science-fiction look ( halo ) and make it legally to wear it ( In thailand ) I...
  8. CMW328i

    Suitable metal for flooring in an industrial lift + power

    Hi all, first post here. I'm currently faced with an assignment in a class where we really haven't been taught anything and have to figure it out on our own. We've been asked to design an industrial lift system to raise approximately 3000 kg up 25 stories. I have done a lot of research and...
  9. DaveC426913

    Low-cost deck roof construction

    I'm looking to roof over my backyard deck. I have particular desires for it. It must - let in light - be rainproof - not reflect sound well - be bug-unfriendly (more on this) Most of the materials that are transparent and rainproof are also hard, and thus reflect sound efficiently, meaning it...
  10. rkum99

    How Can I Build a Small-Scale HIFU System for Inducing Sample Oscillation?

    For a recent project, I would like to construct a small-scale HIFU system to be focused onto a small sample, ideally inducing an oscillation (velocity) of around ~1000 cm/sec. However, upon researching into this topic, I've only really found information on systems used for medical applications...
  11. bcrowell

    SR as Geometrical Constructions

    This is just a random thought, may be totally wrong. Euclidean geometry was originally described as a constructive theory in which the axioms state the existence (and implied uniqueness) of certain geometrical figures. These constructions are the ones that can be done with two concrete tools: a...
  12. J

    Mini heat element Construction

    Hello to all, glad to be here. I have a sort of general question about the construction of a small, rod shaped, battery powered (2 9volts), heating element, that will keep approximately 4 ounces of fluid at a steady temperature between 95 and 100 degrees Farentheit. The heating rod will need to...
  13. P

    Material of construction for reactor (SS 304 or SS 316)

    Would SS304 or SS316 be a better choice for a reactor containing 200 kg/hr sulphuric acid (97%), 2000 kg/hr methanol (98%) and 3500 kg/hr free fatty acids mixture? My initial choice was SS304 since the sulphuric acid amount was little, but upon reading more on methanol, I'm considering about 316...
  14. Joshua Guyette

    Bow Tie Antenna Construction Question

    I'm trying to build a high gain TV antenna. I'm looking to achieve a 75 mile minimum range under most weather conditions. I do have a signal amp board I striped from an OK antenna, that I plan to use as well. I'm trying to specialize the antenna for my viewing market, UHF channels 17-38 (489.25...
  15. bcrowell

    Boundary Construction for B.H. & B.B. Singularities

    There is a general topic of boundary constructions, which means how to adjoin idealized points in a sensible way to a given spacetime. There is a menagerie of these methods, including the g-boundary (Geroch), b-boundary (Schmidt), c-boundary (Geroch, Kronheimer, and Penrose) and a-boundary...
  16. S

    How Many Turns are Required for an Induction Motor in Different Voltage Levels?

    I want to known the stator design of an indiction motor. How may turns required for each pole. For exmple if a single phase motors is designed to run at 230v ac, how may turns required in each pole. If the same motor is designed to be run in lower voltage (say 110v ac or 12v ac) what will be the...
  17. smruti

    What makes the construction of power and pulse transformers different?

    what is the difference between the construction of a power transformer and a pulse transformer used in high frequency application and what about their core and copper losses?
  18. M

    Exact solutions of Wheeler–DeWitt & Yamabe Construction

    Annals of Physics August 2015, Vol.359:80–96, doi:http://dx.doi.org/10.1016/j.aop.2015.04.016 Exact solutions of the Wheeler–DeWitt equation and the Yamabe construction Eyo Eyo Ita III Chopin Soo Show more Abstract Exact solutions of the Wheeler–DeWitt equation of the full theory of four...
  19. B

    Implicit recursive array construction, F90

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  20. ChrisVer

    Exploring the Construction of RICH Detectors

    I have some question about RICH detectors (in particular HERA-B RICH) and why are they constructed in such a way...I think all the RICH detectors though use the same construction that "confuses" me. In their case the particle of some unknown velocity ##\beta## enters the gas of known refractive...
  21. A

    Construction of the path integral

    I am reading about the construction of the path integral in which states that the propagator is given by: <qf l exp(-iHt/ħ l qi > = ∫Dq exp(i/ħ∫dt L(q,q')) and Dq is the integration measure given by limN→∞Πn=1N-1 dqn. Can someone help me understand this integration measure a bit better? I...
  22. C

    Construction of free energy using Landau theory

    Consider an Ising model system where the total energy is ##E = −J \sum_{<ij>} S_iS_j ##, ##S_i = \pm 1## and ##< ij >## implies sum over nearest neighbours. For ##J < 0## the ground state of this system at ##T = 0## is antiferromagnetic. (All adjacent spins misaligned so net magnetisation zero...
  23. Mr Davis 97

    Hypotheses construction for significance testing

    Homework Statement State the null and alternative hypotheses. The decision to implement changes in the current math program at a junior high will be based on a sample of students' scores on a standardized math exam. If the average is less than the statewide average of 89, all math teachers...
  24. K

    Free body diagram of a beam construction

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  25. T

    Need construction advice for rail bogie

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  26. P

    MHB Construction of a Cauchy sequence

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  27. TNesher

    Engineering Is structural engineering worth it?

    Hi, Right now I am in my 3rd year of a dual construction management and environmental engineering degree. I have an interest in building things (both design & construction), but more important to me is a career with a high income and quality of life. I am debating between a structural...
  28. L

    ENGINE HPT blade construction and and its cooling holes

    Hi there, i am currently working in an airline industry but unfortunately do not have enough facilities to carry out my research on the HPT Blades and its cooling holes of an Engine. Would anybody help me on this matter? Thanks
  29. Abolaban

    Question on group theory: simplest math construction

    Hello Big Minds, In the following analysis...It is said that D_2 contains three subgroups Z_2...why did he choose a mathematical constuction contains only two of the the three subgroups? shouldn't he use the three in his construction? what will happen if he used the three? [from the book of...
  30. E

    Construction of capacitor

    Hello, I have made a capacitor with two aluminium foils separated with paper dielectric with, dielectric constant (K) = 3.8 for paper material paper thickness, D = 0.1mm = 1e-4 m plate or foil area, A = (12.1 x 8.3)cm = 0.010043 m air permitivity, Eo = 8.85e-12 F/m Calculated capacitance = (K...
  31. M

    A question from construction of psychrometric chart

    There is wet-bulb temperature of 69 centigrade in the picture which I cannot understand how it is placed there and what is the relation between it and saturation line (RH of % 100) Thank you
  32. R

    Material of Construction for hot brine (NaCl) solution

    What's a suitable Material of construction for equipment handling hot brine (NaCl) solutions? Temperature is max approx. 100 C. I'm conflicted if or not SS316 works? I looked up an old handbook and it reported a corrosion rate of 0.2 mm/year (@80 C) which seems not too bad to me. But I've...
  33. G

    Local construction of Maxwell's action

    What do we mean by "there is no local construction for an action in terms of F^{\mu\nu}, or E and B"? So, I understand the construction "on-shell", once we solve Maxwell's equations to find F^{\mu\nu}=\partial_{\mu}A_{\nu}-\partial_{\nu}A_{\mu}, and how we can then write an action which is both...
  34. TheAdmiralty

    Bitter Magnet Construction

    Evening, gentlemen! Just a quick question for you guys... maybe more, if anyone's seriously interested. I've got a project going on at the university that I hope to get funding for in the future, which is the construction of a relatively small Bitter electromagnet. I say 'relatively' because...
  35. F

    Construction Worker Lifting Uniform Beam

    Homework Statement A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.26 m long and weighs 397 N. At a certain instant the worker holds the beam momentarily at rest with one end a distance d = 1.21 m above the floor, as shown...
  36. C

    What Motor do I need for this small clinostat?

    Hello, I am constructing a clinostat for an Experimental biochemistry research project. Physics is not my forte, and as such I would like advice on what type of low torque motor I need to rotate an 85g cylinder at ~60rpm. A diagram of the design I am using can be found here...
  37. lpetrich

    Explicit construction of isomorphisms of low-rank Lie algebras.

    I've worked that out in my Mathematica notebook "Lie-Algebra Matrices.nb" in directory "Extra Mma notebooks" in SemisimpleLieAlgebras.zip, but I must concede that some of my derivations seem rather inelegant, not using features of the algebras very well. The last comment in How should I show...
  38. E

    Soft to rigid construction materials

    I often enjoyed how when you shape an object with clay and blast it with a furnace, you would be able to turn the soft material into one where you can store water and heavy objects inside, and be resistant to some external forces as well. Thus, it make me wonder if there are materials that...
  39. Greg Bernhardt

    What is Cayley-Dickson construction

    Definition/Summary The Cayley-Dickson construction is a way of getting algebras from other algebras. The starting algebra must have addition, multiplication, and conjugation defined for it, and the new algebra has pairs of elements of the starting algebra with appropriately defined operations...
  40. nomadreid

    Conne's indexing construction for Penrose tilings

    in Appendix D, pp. 179 ff, of Alain Conne's "Noncommutative Geometry", he outlines a process. He looks at Penrose tilings of the plane which are composed of two types of triangles L [with 2 longer sides of length \phin+1, and one shorter side of \phin) for integers n, whereby \phi is the...
  41. paulmdrdo1

    MHB Metallurgy- Road Construction - linear equation

    1. Metallurgy. How much pure gold should be melted with 15 grams of 14-karat gold to produce 18-karat gold? 2. Road Construction. A new machine that deposits cement for a road requires 12 hours to complete a one-half mile section of road. An older machine requires 16 hours to pave the same...
  42. C

    Hubble Telescope: What's the Big Flap/Door?

    I did a cursory search on the forum, and I browsed Wiki...but maybe I missed it. What is that big Flap/Door on the end of the scope.? Is it part of the optics, or is it a protection device, or a...? Thank You
  43. Math Amateur

    MHB Tensor Products - The free Z-module construction

    I am trying (struggling! :() to understand tensor products as developed by Dummit and Foote in Section 10.4 - specifically the early section devoted to the "extension of scalars". I have been reflecting on my attempts to understand the material of Dummit and Foote, pages 359 -362 (see...
  44. Albert1

    MHB The construction of a segment

    given :AB=1 and ,CD=a, EF=b Can you construct a segment with length =$\dfrac {1}{a^3}+\dfrac {1}{b^3}$
  45. M

    MHB Finite element method for the construction of the approximation of the solution

    Hey! :o Given the following two-point problem: $$-y''(x)+(by)'(x)=f(x), \forall x \in [0,1]$$ $$y(0)=0, y'(1)=my(1)$$ where $ b \in C^1([0,1];R), f \in C([0,1];R)$ and $ m \in R$ a constant. Give a finite element method for the construction of the approximation of the solution $y$ of the...
  46. W

    The construction of half silvered mirrors

    Hello guys, I have a question about the construction of half silvered mirrors. I read that they are created using aluminum vapor (so some sort of vapor deposition process?). And I read that the thickness of the aluminum coating can affect the reflectance and transmittance properties...
  47. A

    How Can I Build a Basic Transistor Amplifier for My Phone's Speaker?

    Hi, I have a single 2 watt, 8 ohm speaker from an old radio that i wired directly to a headphone audio jack and tried it in my phone. as you can probably guess, my phones speakers are much louder. How could i make a basic transistor amplifier that could give decent volume from the speaker...
  48. M

    Helicopter construction tips wanted

    So my friend and I are building a helicopter this summer. I was designing the propeller blades and could not figure out what angle a stood for in the pitch equation a=arctan(P/2pi*r) P=tan(a)2pi*r) Also if anyone has any tips or has done this, any advice would be extremely helpful! Thanks!
  49. O

    Sakurai : Approximations in the construction of Quantum theory

    From 'Modern Quantum Mechanics, revised edition' by J.J. Sakurai, In page 44 the translation (spacial displacement) operator \mathcal{T}(d \boldsymbol{x'}) is introduced. \mathcal{T}(d \boldsymbol{x'}) \mid \boldsymbol{x'} \rangle = \mid \boldsymbol{x'} + d \boldsymbol{x'} \rangle It is...
  50. T

    Construction of coupling and maximal coupling (probability theory)

    Homework Statement Let U, V be random variables on [0,+\infty) with probability density functions f_U(x)=2e^{-2x} and f_V(x)=e^{-x}. 1. Give a coupling of U and V under which \{U\geq V\} with probability 1. 2. Give a maximal coupling of U and V. Homework Equations Cumulative distribution...
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