What is Transport: Definition and 265 Discussions

Transport (commonly used in the U.K.), or transportation (used in the U.S.), is the movement of humans, animals, and goods from one location to another. In other words, the action of transport is defined as a particular movement of an organism or thing from a point A (a place in space) to a point B.
Modes of transport include air, land (rail and road), water, cable, pipeline, and space. The field can be divided into infrastructure, vehicles, and operations. Transport enables trade between people, which is essential for the development of civilizations.
Transport infrastructure consists of the fixed installations, including roads, railways, airways, waterways, canals, and pipelines and terminals such as airports, railway stations, bus stations, warehouses, trucking terminals, refueling depots (including fueling docks and fuel stations), and seaports. Terminals may be used both for interchange of passengers and cargo and for maintenance.
Means of transport are any of the different kinds of transport facilities used to carry people or cargo. They may include vehicles, riding animals, and pack animals. Vehicles may include wagons, automobiles, bicycles, buses, trains, trucks, helicopters, watercraft, spacecraft, and aircraft.

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  1. S

    Solution of the One-Speed Transport Eqn. by K M Case method

    Homework Statement In the book, Nuclear Reactor Theory, Glasstone, Bell, under section 2.2 SOLUTION OF THE ONE-SPEED TRANSPORT EQUATION BY THE SEPARATION OF VARIABLES, I have difficulty in understanding the derivation. Hope some one can explain the derivation or give a reference where the...
  2. maverick_starstrider

    I Transport in PV Cells (and pn diodes)

    Hi, I'm having some trouble wrapping my head around some of the concepts and language of charge transport in Photovoltaic cells (and thus pn-diodes). My biggest problem is understanding the role played by the emitter region vs. the depletion region. In a typical PV cell the front emitter...
  3. davidge

    I Parallel transport vs Fermi Transport

    Since for a general contravariant vector, ##\nabla_{\nu}V^{\mu}## will not in general be zero, is it correct to say that all of them are transported by Fermi Transport? (With the only vector being parallel transported being the four velocity vector?)
  4. A

    I Understanding Parallel Transport

    I'm currently in a GR class and have come across the notion of parallel transport, and I've searched and searched the last few days to try and understand it but I just can't seem to wrap my head around it, so I'm hoping someone here can clarify for me. The way I picture parallel transport is...
  5. U

    Reynolds transport theorem derivation - linear momentum

    I've managed to derive the form of Reynolds transport theorem as a bilance of linear momentum of the system: \left (\frac{\vec{\mathrm{d} p}}{\mathrm{d} \tau} \right )_{system}=\frac{\mathrm{d} }{\mathrm{d} x}(\int_{V}^{ }\vec{v}\cdot \rho dV)+\int_{A}^{ }\vec{a}dm+\int_{A}^{ }\vec{v}\cdot \rho...
  6. M

    Reynolds Transport Theorem and Volume calculation

    I cannot understand the the relation between Reynolds Transport Theorem and Volume Calculation. Volume calculation is an simple, straightforward process which, I think, have much connection between Reynolds Transport Theorem. We calculate volumes in thermodynamics, heat transfer and fluid...
  7. P

    A More on Parallel Transport: Existence & Uniqueness

    The recent thread on parallel transport has raised a couple of things I'd like to review for my own sake. I'll address them one at a time as my time permits. The first question is this. If we offer ##t^a \nabla_a u^b## or the equivalent ##\nabla_{\vec{t}} u^b## as the definition of parallel...
  8. JEngineer

    Calculating Beam Sizing for Cargo Transport

    Good Day Guys, I need help in checking the beam size required to transport a cargo. What checks do i do? 1. Check actual BM with resisting moment of the beam 2. Check actual shear with the resisting moment of the beam How do i calculate following if I only know the type of beam used, i.e...
  9. EternusVia

    I Interpretation of the Reynolds Transport Theorem?

    Background: I am taking an undergraduate fluid mechanics class. I seem to have a misunderstanding with my interpretation of Reynolds Transport theorem (RTT), which I have written below: $$\frac{DB_{sys}}{Dt} = \frac{\partial}{\partial t}\int_{CV}\rho bd V +\int_{CS}\rho b \vec{V}\cdot...
  10. M

    Electrical processes through a membrane - active transport

    Homework Statement [/B] I am given the configuration below of a membrane and it is said that Na+ ions are transported actively through transporters from the inside to the outside. The J_Na_a seen below is the active current density of the Na ions and it is constant. Vm is the potential...
  11. F

    Is this definition of Reynolds' Transport Theorem correct?

    One thing I find frustrating when trying to get a handle on this theorem is the number of different forms presented in the literature. I understand this to be due to it being very general theorem applicable to many different contexts. Not that the world needs a new, slightly different looking...
  12. A

    Proton transport problem using MCNP

    Hello everyone ! I wanted to ask you if anyone ever encountered problems with proton transport using MCNP. In particular, the production of electrons when protons interact with matter. I have been trying to figure it out modifying the different physics cards (phys, lca, ...) with no result...
  13. ATY

    A Is the Derivation of Ekman Transport Correct with These Assumptions?

    Hey guys, I need your help. We tried to derive the ekman transport in a lecture. The assumptions we made are 1. constant density 2. stationarity 3. no horizontal pressure gradient and no horizontal velocity gradient 4. no vertical velocity. So this is what the professor showed us: But is...
  14. ATY

    A Deriving Ekman Transport in the Southern Hemisphere

    Hey guys, I got this problem: We had the derivation of the ekman transport today in class. And what I wondered about is this: Usually the equation for the ekman transport looks similar to this (depends on the author) u = V_0 e^{az} cos(\frac{\pi}{4}+az) v = V_0 e^{az} sin(\frac{\pi}{4}+az)...
  15. F

    I Conservation of dot product with parallel transport

    Hello, I have 2 questions regarding similar issues : 1*) Why does one say that parallel transport preserves the value of dot product (scalar product) between the transported vector and the tangent vector ? Is it due to the fact that angle between the tangent vector and transported vector is...
  16. J

    I Connection between Foucault pendulum and parallel transport

    Hello! I try to think about the Foucault pendulum with the concept of parallel transport(if we think of Earth as being a perfect sphere) but I can't quite figure out what the vector that gets parallel transported represents(for example, is it the normal to the plane of oscillation vector?). In...
  17. Andrew Bridges

    Can I make a heat-based transport pipe?

    I learned about Tesla's valve and how, without moving parts, it wouldn't be useful enough. But my question is, can I make a pipe with the valve's structure, and only apply heat in order to create flow. I know things follow the path of least resistance, and with a constant addition of heat, I'm...
  18. facenian

    I Fermi-Walker Transport: History & 1932 Paper

    Hello, I'm studing the history of this phenomenon. Does someone has the original paper of A.G. Walker of 1932?
  19. K

    I How to understand diffusive and ballistic transport?

    Hi there, I am always confusing in the difference between diffusive and ballistic transport. My understanding on the diffusive transport is from it's name, particles diffuse from the high density region into the low density region. I think the diffusion happens towards all direction, is it why...
  20. H

    Classical BSL Transport Phenom. vs. BSLK Introductory Transport Phenom

    I'd like to purchase one of these books for self-study. The BSLK Introductory Transport Phenomena claims: "Devoting more space to mathematical derivations and providing fuller explanations of mathematical developments—including a section of the appendix devoted to mathematical topics—allows...
  21. ramzerimar

    SpaceX About the SpaceX Interplanetary Transport System

    I know Mars colonization is a hot topic these days, and there are a lot of threads on this topic, but I would like to discuss specifically the SpaceX Interplanetary Transport System. There's a video on the subject here. On a recent thread that I posted here, some people came to the conclusion...
  22. mfb

    SpaceX SpaceX: Interplanetary Transport System

    Elon Musk presented SpaceX's plans for its manned missions beyond Earth orbit yesterday. SpaceX is well known for missing their deadlines (like most in the space industry, to be fair), so we'll see how long it will take to develop it. The question how it will look like is clearer already, here...
  23. M

    Is there such a thing as non-mechanical transport

    Hello, When looking at the simplest definition of mechanical devices, is there a way to transport something non-mechanically? Physics isn't my strong suit, but it seems to me that all transport is mechanical in nature. The phrase 'mechanical transport' comes up a lot in political discussions...
  24. G

    I Why Is Negative Magnetoresistance Possible in Dilute Magnetic Alloys?

    A free electron gas would have zero magnetoresistance; it takes two carrier types to get ordinary magnetoresistance, which is always positive in sign. Beal-Monod and Weiner explain the negative magnetoresistance found in very dilute magnetic alloys, in terms of the spin-flip scattering of...
  25. G

    Is energy transport in electric DC setup quantized?

    I have to say first that I found quite a similar question under https://www.physicsforums.com/threads/poynting-vector-dilemma.331375/ However those thread ended without real answer.There shall be the following simple setup: A battery, and quite at a distance a light bulb. They are connected by...
  26. sehrish shakir

    Neutron transport equation and pressure drop calculations in core ...

    i am a physicist now i am doing Ms in nuclear engineering ... i need to understand basic concepts ... neutron transport equation ? what is the transport phenomenon actually ? and pressure drop calculations in core ... please help thanks in advance
  27. mertcan

    I Taylor expansion and parallel transport

    hi, first of all in this image there is a fact that we have parallel transported vector, and covariant derivative is zero along the "pr"path as you can see at the top of the image. I consider that p, and r is a point and in the GREEN box we try to make a taylor expansion of the contravariant...
  28. Evangeline101

    Newton's First law: Barrier on large transport trucks

    Homework Statement Explain why large transport trucks have a hard steel barrier between the load and the driver's cab. Consider Newton's first law in your answer. Homework Equations no equations required.The Attempt at a Solution According to Newton’s first law, if no net force acts on an...
  29. kev931210

    How do I expand Reynold's transport theorem using the given equation?

    Homework Statement Homework Equations one dimensional Reynold's transport theorem The Attempt at a Solution [/B] I started with this equation, and tried to expand it using the equation given in #2. This is the farthest I have gotten so far. I got stuck from here. I do not know how to...
  30. CMATT

    Which of the following is/are true regarding glucose transport

    Homework Statement Which of the following is/are true regarding glucose transport to the brain? There could be multiple answers. a) Glucose uptake by the nerve cells of the brain is dependent on insulin b) Greater concentrations of glucose in the blood should increase the rate at which glucose...
  31. snoopies622

    Calculate Parallel Transport: Get Out of Logical Loop

    I'm in a logical loop here: 1. A tensor undergoes parallel transport if, as it moves through a manifold, its covariant derivative is zero. 2. Covariant derivative describes how a tensor changes as it moves through a manifold. 3. A tensor undergoes change as it moves if it does not parallel...
  32. O

    How does ATP change the shape of a transport protein?

    Hi, Could someone explain to me how exactly ATP changes the shape of a transport protein? If ATP, when hydrolyzed, releases free energy, how does this energy change the conformation of the structure of the protein? Additionally, why must a phosphate group attach itself to it? Thanks!
  33. C

    Gradients and linear transport

    So I have NO IDEA how to do this problem. I am assuming it has to do with linear transport because that's the next section in the book but we have yet to talk about this in lab and briefly (one slide) discussed this in lecture. I tried reading in my book which was did no good as it just showed...
  34. S

    How do you actually calculate this....?

    Hello! In my course on physical transport processes time and again these type of equations, containing partial derivatives, appear: But how do you actually calculate such an equation? I know how to take the partial derivative from a function like x²tz³. Would it be that I am given a...
  35. G

    [optics] How to transport light/image in narrow tube

    Hello there! I'm new on the forum and english is not my first language. I'm working on an art project and I wonder if there's any mean by which I can transport the light from an illuminated scene across a small tube (let say not larger than 5 cm in diameter) and over some distance (let say 2...
  36. P

    A Superluminal Energy Transport & Causality: Does It Violate Relativity?

    In superluminal light pulse experiments, as shown in Fig. 4 of the Letter [Nature 406 (2000) 277], the whole pulse intensity profile observed is advanced by 62 ns nearly without any distortions, and the light pulse energy must be transported faster than the speed of light in vacuum...
  37. evinda

    MHB Solutions to Transport Problems Using Dynamic Programming

    Hello! (Wave)Suppose that we have $M$ production stations $A_1, \dots, A_M$ of a product and $N$ destination stations $B_1, \dots, B_N$ of the product. We suppose that $x_{ij}$ units of the product are transferred from $A_i$ to $B_j$ where $i=1, \dots, M, j=1, \dots, N$. The cost of...
  38. F

    Do the Krebs cycle and electron transport chain require ATP?

    I cannot find a website that answers this question, and all diagrams I see do not show that ATP is used. Does this mean that these processes are intrinsically spontaneous? I can see how the electron transport chain is spontaneous, as the oxidation of oxygen to water is favorable (E 1/2=0.7V).
  39. Q

    Minimum work to transport electron?

    Homework Statement A charge Q = -820 nC is uniformly distributed on a ring of 2.4 m radius. A point charge q = +530 nC is fixed at the center of the ring. Points A and B are located on the axis of the ring, as shown in the figure. What is the minimum work that an external force must do to...
  40. J

    Reynolds transport theorem (1st year undergrad fluids)

    hello all, I just wanted to check my worded interpretation of this otherwise messy result is ok:
  41. L

    Is Plasma Responsible for Transporting Oxygen in the Blood?

    Does plasma transport oxygen?
  42. D

    Geodesic Transport of Small 2D Surface on 3D Manifold

    Hello, I've just read and I think I have understood the following result : If we were to geodesically transport all points of a small 2D surface, so small that it would be flat for all purposes, in a direction vertically above it, and if this surface belongs in an arbitrary 3D manifold, then in...
  43. Vannay

    Electron Transport in Bacterial Nanowires

    I was reading through a paper about the first case of experimentally proving that electron transfer can occur over the length of a bacterial nanowire. The paper mentioned that, previously, electron transfer was only measured across the thickness of the wire. "Thus far, there has been no...
  44. T

    Microparticle Transport via Directed Particle Gun

    Greetings PFers, Would it be possible to move microscopic particles of a wide range of composition (conductivity, density, etc...) using a directed beam technology? The idea is to have a fast 3D printing technology (practically no moving parts) that is capable of depositing of a wide array of...
  45. evinda

    MHB General solution of Transport equation

    Hello! (Wave) General solution of Transport equation (homogeneous): Method of Characteristics $$u_t+cu_x=0 (\star)$$ We know that if $f: \mathbb{R} \to \mathbb{R}$ is differentiable then $u(x,t)=f(x-ct)$ is a solution of $(\star)$. We will show that each solution of $(\star)$ is of the form...
  46. evinda

    MHB Verifying Transport Equation as a Dispersion Equation

    Hello! (Wave) Definition A partial differential equation is called dispersion equation if it allows solutions in the form of a wave function and furthermore solutions in the form of a wave function with different wavenumbers have different velocities. The relation between the cyclic frequency...
  47. MexChemE

    Transport phenomena -- Direction of shear stress

    Greetings, PF! I have some questions regarding the problem I attached below. It is some sort of Couette flow variation. It's not homework, I'm just learning the basics of TP on my own. I fully solved the problem with the Navier-Stokes and continuity equations, using some assumptions in order to...
  48. U

    Bernoulli vs conservation of momentum (Reynolds transport theorem form)

    So I've found several instances in which Bernoulli and Conservation of momentum (in Reynolds transport theorem form) give different answers for the study of an inviscid fluid. Let's consider a simple situation as described in my diagram attached. Basically a tap/faucet is releasing fluid, which...
  49. B

    Unsteady vorticity transport equation: codes available?

    I would like to reproduce results from a much older code to test a new one. I only have the old code's results in the form of plots, not data, but I need data. The older code solves the unsteady vorticity transport equation in 2D with a constant kinematic viscosity term. I'm interested in 2-D...
  50. bcrowell

    Parallel transport to explain motion of light near black hole?

    I'm currently teaching a gen ed course called Relativity for Poets. This is the first semester I've taught it, and it's been a ton of fun so far. If anyone is curious, http://www.lightandmatter.com/area3phys120.html is the class's web page with links to the syllabus and lecture notes. The...
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