# Construction Definition and 252 Threads

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. ### Do you think this is an oil well, water well or what? (Tintype)

Maybe 1860s - 1870s tintype. Post processed heavily to reveal the image. What do you think they are building? I'm not student or engineer. I'm an archivist. (non-professional) I get lots of old photos and films that need some deciphering, so hope this group can help out.
2. ### B How circular does it need to be?

The above was part of a conversation on ##\pi## and the implication seems to be that the more accurate the value of ##\pi## in our calculations in an engineering context, the more circular our construction. Questions: 1. Is this true? More accurate values of ##\pi## allow for construction of...
3. ### How to construct a periodic function ## f ## with period ## 4 ##?

On the book, it says, "Let ## f ## be defined by ## f(4n)=f(4n+1)=0, f(4n+2)=2 ## and ## f(4n+3)=1 ##, for all integers ## n ##". (Other answers are possible). But I don't understand, how does this work in the problem? I know that it must has something to do with the period, which is ## 4 ## in...
4. ### Looking to Learn Without Formal Education?

Hi all, I’m here to pick the brains of a people much smarter than myself. I cannot afford to nor can I justify a full education just to scratch my curiosity itch. I work in construction and did coatings on concrete for 17 years, more recently I’ve transitioned to home remodeling. I barely...
5. ### Sustainable building with earth, corrugated galvanised iron and rebars

There are lot of people on the Internet trying to build a cheap and sustainable house. Inspired by them I came with the idea of building external walls of Corrugated galvanised iron (CGI) and rebars and fill them with earth / sand. The basic element of the wall structure is this rebar trapeze...
6. ### Seeking Guidance on Internal Floating Roof Tank Construction with Dome Roof

Dear Engineers, I hope this message finds you well. I'm reaching out to seek guidance on a new project that I am undertaking: the construction of an Internal Floating Roof (IFR) tank with a dome roof. As I am relatively new to this position, this project presents a significant learning...
7. ### Building Better: Exploring Science and Engineering in Construction

Hello everyone, I just joined the forum, after a bit of lurking on some various threads. It seems like a great forum. While I'm not a engineer, I am involved in various areas of construction, and I always try to back up my designs and work with as much science and engineering as I can. I hope...
8. ### Homemade vacuum chamber construction

I hope you folks can help. I want to be able to pour a liquid from one container into two others in the absence of air. So I was thinking of making some sort of vacuum chamber out of 1/2" polycarbonate and some heavy duty plastic sleeving into which to place my hands and arms. Or am I being...
9. ### A Ballentine on construction of the (Galilean) symmetry generators

In Problem 3.7, Ballentine says: The unitary operator ##U(v) = exp(iv·G)## describes the instantaneous ##(t = 0)## effect of a transformation to a frame of reference moving at the velocity ##v## with respect to the original reference frame. Its effects on the velocity and position operators are...
10. ### I Construction of an Entangled Photon Source

Hello, Happy New Year 2023 ! Interested in spontaneous parametric down-conversion (SPDC), and the possibility of creating entangled photon pairs, I studied several possible configurations with type 1 and type 2 nonlinear crystals. When using these crystals, the dominant phenomenon is second...
11. ### Calculating the energy savings of an insulated cavity in home wall construction

I am a client who bought a new house and the cavity in the wall was not insulated. I can calculate the U value of the uninsulated wall and the U Value of the wall if it were insulated correctly. front the two different U values I want to calculate how much extra energy is being lost through a...
12. ### I The collapse of a quantum state as a joint probability construction

The titular paper can be found here, https://doi.org/10.1088/1751-8121/ac6f2f, and on arXiv as https://arxiv.org/abs/2101.10931 (which is paginated differently, but the text and equation and section numbers are the same). Please see the abstract, but in part this 24 page paper argues that we...
13. ### New Car Battery Plant Construction in the Midwest

Panasonic is going to build an electric car battery factory plant in DeSoto, KS. Will hire 4000 jobs at the plant and another 4000 jobs throughout the state. IIRC, the factory will cost 4 billion dollars to build. edit: corrected spelling of DeSoto
14. ### Is there a good source for construction blueprint symbols?

I've seen quite a few websites but I don't know how far to trust them. Is there a book I could use? Thanks so much Joe
15. ### Chemical plant design and construction

Got some good resources on Chemical plant design and construction. A Chemical plant design and construction. B Chemical plant design and construction.
16. ### Wondering if there are any construction contractors on PF (looking for opinions)

Hey everyone I am looking at an older home to buy and wondering how much of a pain in the butt it would be to extend the garage out wider vs just building a secondary garage? Attached is a picture for reference :smile:
17. ### Quantum Readable sources for C*-algebras and GNS construction?

It is there a gentle introduction to C*-algebras and the GNS construction that is readable for physicists? You know, a text with an emphasis on QM that is formal enough to not be sloppy but not too much as to require a Ph.D in functional analysis to be read.
18. ### Geometric Construction (bisecting an angle with a compass and straightedge)

In discussing flight mechanics with a (15 years younger) co-worker with a doctorate in Aerospace Engineering. We examined some angles and I happened to mention bisecting an angle. I told him in High School in the early 1970's we learned how to bisect an angle with compass, and straightedge...
19. ### Heavy Construction Equipment Tier List

7. Fruehauf Super Dump The super dump has a load-bearing axle rated at as high as 13,000 pounds. The large distance between the first and last axles is in fact the maximum allowed under the federal bridge formula. Developed by Strong Industries, the super dump is renowned for its high payload...
20. ### How Do You Build A Quantum Computer?

So I have heard that IBM and Google have constructed Quantum computers, how does one actually construct a Quantum computer? I would like as much detail as possible on the construction of one of these devices and how it works exactly, I wanted to buy a Spin Q Quantum computer and I understand how...
21. ### How to calculate the maximum stress in a rib of a complex construction

A Construction is stiffened by a bottemplate with welded ribs. A flange welded to the inletpipe is bolted at the botomplate. I want to simulate the current situation. Therfore I need a handcalculation of the stresses in the ribs of the constuction. The forces and moments are working in the worst...

33. ### A Can wavepackets be used to solve ODEs in Hilbert spaces?

Hi, it was suggested previously on PF by others that a way to solve a ODE where the domain of the operator in Hilbert space allowed a real solution, is through the construction of wavepackets. The conditions for real solutions are according to Kreyszig's Functional Analysis that E, in the...
34. ### Construction of metric from tensor products of vectors

1. The metric ##g_{\mu \nu}## of spacetime shall be constructed from tensor products of vectors (relevant are the unit vectors in the respective directions). One such vector shall be called ##A##. Homework Equations ##g_{\mu \nu} = \lambda \frac{A_\mu A_\nu}{g^{\alpha \beta} A_\alpha A_\beta}...
35. Y

### Automotive Construction of CVT Metal push belt

I am trying to understand the construction of CVT Metal belts that are made up of steel elements and some rings. I do not understand the full construction details of the belt. The most detailed information I have got ever is in this PDF on page 5...
36. F

### Which is Cheaper: 30 Separate Houses or a 30-Story Building?

What is cheaper, the construction cost of 30 separate houses at ground level vs that of a 30 storied building, with one house per floor and exactly same layout ? Also, how about 10 or 20 instead of 30 ? Does it linearly scale ?
37. ### Foundations Construction of the Number Systems ... Natural, Integers, etc

At present I am trying to understand the construction of the number systems ... natural, integers, rationals and reals ... What do members of PFs think is the clearest, most detailed, most rigorous and best treatment of number systems in a textbook or in online notes ... ? NOTE: I am currently...
38. ### MHB Construction of the Number Systems .... Natural, Integers, Rationals and Reals

At present I am trying to understand the construction of the number systems ... natural, integers, rationals and reals ... What do members of MHBs think is the clearest, most detailed, most rigorous and best treatment of number systems in a textbook or in online notes ... ? NOTE: I am...
39. ### A Wulff construction for surface energy dependent on depth

Hello, Using surface energy dependence on surface orientation it is possible to predict equilibrium crystal shape by applying Wulff construction. But I faced the problem when the surface energy depends not only on the surface orientation but also on the surface depth or surface termination and...
40. ### Why don't wood construction sites get damaged in the rain?

They're building new condos across from my parents house right now (adjacent neighborhood). I see this site everyday and it's growing. Right now, they've got a lot of the framework up for the condos and it's all wood (as far as I can tell). It's also raining a lot here. Question - why...
41. ### McCabe-Thiele Construction and Reflux

How does one depict R= 1 × 10-6 , and subsequently a y-intercept of y = 6 × 10-6 on a y-x diagram? I'm new to the concept and very confused. From my understanding, this means that the reflux is essentially 0. It's also assumed that the distillate is purely vapour, so XD = 0 as there is no...
42. ### The principle and mathematics behind Klein's construction?

Hello, I tried looking this up a lot and just could not find it. For four bar linkage, Klein's construction is used to find velocity and acceleration of piston and connecting rod. Here is a link for the procedure of the same...
43. ### Question about solar cell construction

Why must we place the anti-reflection glass on top of the n type semiconductor? ( Why must the sun light incident on the n type semiconductor? )
44. ### How are construction lines used in Autodesk?

Hi everyone. I know that construction lines were used when drafting was done by hand. Now, we do everything on the computer. So, how are they used on the computer? Also, how are guidelines used in autodesk? Were they not used in manual drafting also? How are they used in computer drafting...
45. ### How Do You Build a Functional Leyden Jar for a School Project?

I'm a high school junior and doing a project on ben franklin. specifically I'm making a model of his electric motor which used two Leyden jars to operate. I want to make it a working model but I cannot get the leyden jars work. can anyone explain to me how to construct a historically accurate...
46. ### MHB From a sketch to the compass ; Geometric construction

This is a rough sketch, (Happy) Now apart from constructing the triangle can you help me to located the point D & Obtain the location of point E on side AB such that ACDE is a trapezium ,only using an straight edge and a compass. (Crying)
47. ### MHB Show that angle AXC=angle ACB; geometric construction

Looks like this question is going to make a long thread. :) This is what the problem states Using the pair of compass and a straight edge, Then, After That, Thereafter, Thereafter, The question states to mark the point where the tangent and AD produced as 'X'.Now can you help me...
48. ### A Can Protons Interact with Double Slit Construction?

How are the double slits constructed? If you use electrons or photons then they should interact with that material or what?
49. ### I Tensor product and ultraproduct construction

I do not know if this is the proper rubric to ask this question, but I picked the one that seemed the most relevant. I have noticed some superficial resemblance between the tensor product and the ultraproduct definitions. Does this resemblance go any further? While I am on the subject of...
50. ### MHB Diagram: Construct Circle w/ 9 Equal Parts

divide a circle into 9 parts with equal area