What is Structural: Definition and 233 Discussions

A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals. Abstract structures include data structures in computer science and musical form. Types of structure include a hierarchy (a cascade of one-to-many relationships), a network featuring many-to-many links, or a lattice featuring connections between components that are neighbors in space.

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  1. N

    Structural Formulas for all the (C5H11OH) alcohols

    Given: Draw structural formulas for all the alcohols that have the molecular formula C5H11OH. Name each one and classify them as primary, secondary, or tertiary alcohols. Describe how they are formed and give two uses for this type of alcohol. Solution: I am still at the naming portion but...
  2. S

    Is Structural Integrity related in any way to Static Friction? Or vice versa?

    Structural integrity in my head means an object's uncompromised ability to safely resist required loads. Now is static friction related any way to it since the way to break structural integrity is to overcome the object's max load limit? Also how can you walk across the floor without you or...
  3. S

    Structural Difference in Annealing vs Untreated Steel

    I know annealing makes a material more ductile, but what are the differences in the structuer of the material? I have a picture I took of 1018 and 1040 untreated... if you know the difference, think you can point them out? I'm not looking for differences in any specific material I just have...
  4. R

    Structural analysis influence lines in beams

    Homework Statement http://antishift.org/image.php?id=16122&size=medium Homework Equations Static Equilibrium equations: since most of the supports are rollers, only y-forces are considered as well as moment equations. I'm pretty sure E and F are hinges so there are no moments around E and F.The...
  5. S

    Getting Started: Solving Joint Problems in Structural Mechanics

    Homework Statement See Attachment Homework Equations The Attempt at a Solution Im not really sure how to get started. I understand the method of Joints, and all the solved examples I can follow. I started by analyzing the support reactions, and I am stuck already. There is...
  6. A

    How to name structural features

    i need help with this, i got lost in my chemistry lab, i know how to name the structures of molecules, but features such as flat area, troughs etc.
  7. C

    Structural failure of steel due to heat?

    Hi I was wondering how heat effects the tensile strength of steel. Since there are various alloys under the banner of 'steel', I was hoping for simply a general idea of the effect, if possible. Here is a quick quote to steer us in a good direction:Most steel has other metals added to tune...
  8. radou

    Structural analysis lecture notes

    An extremely useful set of lecture notes for anyone who wants to investigate statics of indeterminate structures (i.e. the force and displacement methods). Influence lines are included too. http://www.ecf.utoronto.ca/apsc/courses/civ214/Lecture%20notes.html"
  9. B

    Proper full Lewis structural diagram of Quinine?

    Does anyone have a site or link where I can get a proper full Lewis structural diagram of Quinine? And if possible, the Dipole forces drawn on the diagram to indicate polarity. Thanks a ton. Oh yes, and one more question. How do I determine the polarity of the whole molecule? The molecule being...
  10. S

    Help with structural formula and resonance structure

    I don't know what I am doing wrong, please help. 2) How many different structual formulas can be written for C6H14 Include straight chain and branched chain compounds. Enter an integer as an answer. (I put in 5 but it say that I am wrong) 3) Which of the following...
  11. L

    What is the difference between structural isomerism and geometric isomerism?

    What is the difference between structural isomerism and geometric isomerism?? Yea. The thread title explains it.
  12. B

    Structural Stability of Scyllo vs Myo Inositol

    Scyllo-inositol should be more stable than myo-inositol, right? (unless I'm missing a certain detail) But in nearly all literature on inositols, it is always myo-inositol that is primarily focused on. Scyllo-inositol is said to exist in "trace amounts" along with other inositols, while...
  13. H

    Structural analysis: matrix question

    I'm afraid I have another problem to be solved I don't quiet understand, thanks to my poor english and some information missing in the course notes. ---- You are writing a 2-dimensional finite element programming code to be used in the structural analysis of a material with a newly...
  14. H

    Structural Mechanics: Solving Shear Force on a Cut Beam

    hi there any 1 know how to work out shear force ona cut beam ? i got the str3 web page problems!
  15. 1

    Are there any CA structural engineers on this forum?

    Need help with interpreting the UBC! :biggrin:
  16. T

    Force Resolving Structural Engineering Problem

    Can someone please help me start this question, I missed some vital notes in class and don't know how to do it. I just need to know the method so I can go on to do it myself Thanks :) http://img408.imageshack.us/img408/3743/question70yu.th.jpg
  17. P

    Bismuth sulphide structural diagram

    Can anyone tell me if the structural diagarm of Bismuth(III) Sulphide looks like this: S-S-S l l Bi = Bi
  18. T

    What are the best materials for a nuclear bomb shelter?

    wut would be the best material for a nuclear bomb shelter (like metal wise and concrete wise).
  19. P

    Axially loaded structural member problem

    Hey guys, I need setting up this problem. Here it is: A structural member is fabricated from a solid round bar of steel with a diameter D=50mm. If the member is 6.0m long, determine the maximum axial force that can be applied if the axial stress is not to exceed 175MPa and the total...
  20. F

    Structural Mechanics Text

    Tom Irvine at Vibrationdata.com has linked to a book "Structural Mechanics for Undergraduates." The entire book is free to download here: http://www.vibrationdata.com/strength.htm As a side note: If you are at all interested in learining about vibration theory, analysis and related topics...
  21. M

    Structural Formulas: HBr & 2-Propene, 1-Butanol & 1-Propanoic Acid

    Last Question.. I promise! a)Using structural formula show the reactions between: i) HBr and 2-propene ii) 1-butanol and 1-propanoic acid. b) How many isomers are possible in (i) c) Name the type of reacion in (i), In (ii) d) To what family does the organic product in (ii) belong? K...
  22. W

    Exploring Math's Structural Impact on Logic & Beyond

    Is the struggle to reach beyond relativity and quantum mechanics, beyond the big bang, possibly its creation and necessity to our logic, the result of structural problems with mathematics itself? The fundamental unit of maths is numbers, is it not? The discovery of zero or its inclusion in the...
  23. N

    Shapes of structural diagrams-help

    What would be the shapes of these molecules? I drew them out but I couldn't still figure out the exact shape names a. SeO_{3} b. HClO_{2} c. NO_{2}^{-} d.ClF_{5}
  24. C

    White Dwarfs: Structural & Evolutionary Overview

    Alrite. I am currently trying to write a essay on the structure and evolution of white dwarfs but can't really find any decent websites on this topic. anyone know of any reliable sources of info? i have four books on the topic but all seem to differ from each other when it comes to the actual...
  25. O

    What are the best lightweight materials for small wheel rims?

    I am looking to make some small wheel rims (about 6-8 inches). I know there are currently rims made of aluminum and magnesium. I know steel would work, but what would be some light weight alternatives. I know of titanium, carbon steel maybe?, steel. I am looking for the strongest, lightest, and...
  26. B

    Structural Engineering - Deflection

    I'm not sure the formula to use to calculate the deflection of a beam. Here's the information I have got. Steel beam is 50 feet long. There is a 6,000 pound load in the middle(all other loads are disregarded. The modulus of elasticity is 29,000,000 psi. Moment of inertia is 850 inches^4...
  27. P

    Help Needed! Struggling with Structural Analysis Problem

    This is a HW question, and I posted it in the HW section, but no one there seems interested. Perhaps somewhere here would be willing to lend a hand? See the problem in the attachment. I basically don't know if I am on the right track. I started with part a) by trying to find the force...
  28. J

    Hydrocarbon Structural Diagrams

    Hello, I was quite curious about this one here... If I were asked to draw a structural diagram, for example, of trimethylbutane, where would I put the three branches of methyl. When they don't specify the location of the branches what does one do? I'd normally be expecting something like...
  29. J

    Electron Dot Diagram and Structural Formulas

    Hello, I was hoping someone here might be able to explain to me how to determine electron dot diagrams and structural formulas of diatomic/polyatomic elements and compounds. For example... Nitrogen Tri-iodide ( NI3 ) I know the basics of electron dot structures, but when the atoms start...
  30. O

    A structural point of view on Cantor's diagonal arguments

    Hi, Please read it until the end, before you write your remarks. Thank you. ---------------------------------------------------------------------------- The main idea of Cnator's second argument is to show that the real numbers list can never be a complete list. If we have to...
  31. O

    Noncommotative structural numbers

    Noncommutative structural numbers Hi, In the attached address (at the end of the web page) there is a short paper (a pdf file) on noncommutative structural numbers: http://www.geocities.com/complementarytheory/CATpage.html I'll be glad to get your remarks. Thank you (and...
  32. O

    Can Equation-Trees Represent Information Structures in Mathematics?

    Hi, Take for example these 5 equations: 1 1 1 + 2 = + 2 = + 1 1 1 4 = + 4 = + 4 = + 1 1 1 + + 2 = +...
  33. D

    Bridge Design: Structural Analysis Help

    Am seeking input/help with structual analysis on new bridge design. See: http://groups.msn.com/DavesBridgesandTowers for details Dave
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