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. D

    Parallel Transport & Covariant Derivative: Overview

    I have been reading section 3.1 of Wald's GR book in which he introduces the notion of a covariant derivative. As I understand, this is introduced as the (partial) derivative operators \partial_{a} are dependent on the coordinate system one chooses and thus not naturally associated with the...
  2. B

    Verifying Duderstadt & Hamilton's Eqs. (4-134) & (4-137) in Nuclear Transport

    Show by direct calculation that Eqs. (4-134) and (4-137) in the textbook by Duderstadt and Hamilton hold, i.e.:(a) ∫ dΩΩiΩj= 4π/3 δij; i,j = x,y,z; 4π(b) ∫ dΩΩxΩyΩz = 0, if l, m, or n is odd. 4π The integrals are over 4π. This is part of the derivation of the diffusion equation...
  3. E

    Confusion about parallel transport

    I am studying parallel transport in order to understand Berry curvature, but I know this topic is most commonly used in GR so I'm posting my question here. I do not know differential geometry. I am looking for a general explanation of what it means to parallel transport a vector. Mostly I am...
  4. D

    Can clock transport tell us anything important

    Clock transport can be used to compare one clock with another in an absolute sense. All we have to do is to transport a clock between two A-frame clocks that have been synchronized per Einstein's definition. Let's call the transported clock "T" and the left-hand and right-hand E-synch'd clocks...
  5. G

    Torque due to static fluid- Transport Phenomena

    1. Homework Statement Calculate the torque on the dam about the origin (Picture attached) due to the pressure force of the fluid. Homework Equations Pressure force is correct (dF) The Attempt at a Solution [/B] I have solve it; however, I am not sure if I calculated over the origin asked...
  6. B

    Bi-directional transport of light

    In several fiber-optic-based probes in medical imaging fields, the light travels towards an object through an optical fiber (or even free space), interacts with the object and then travels back through the same fiber (or the same path in free space) and is captured by a camera or photodetector...
  7. JonnyMaddox

    Parallel transport on a cardioid

    Hi guys, I want to calculate an explicit example of a vector parallel transported along a cardioid to see what happens. Maybe someone could help me with that since no author of any book or pdf on the topic is capable of showing a single numerical example. So we need a vector field on a manifold...
  8. S

    Questions on Parallel Transport: Riemann Tensor & More

    In my recent studies of curvature, I worked with the Riemann tensor and the equation: (\deltaV)a= A\muB\nuRab\mu\nuVb Now previously, I worked in 2D with the 2 sphere. While doing so, I learned that if I set my x1 coordinate to be θ and my x2 coordinate to be ø, then the vectors that serve...
  9. S

    Parrallel transport on the 2-sphere

    I recently derived the Riemann tensor (Rabmv) for the 2 sphere. I then did RabmvUbVmWv to calculate dva (the change in the vector va as you parallel transport it around the loop of the sphere). The result I got for dv1 was 0. I got 0 for dv2 as well. I am just making this thread to...
  10. vead

    Boltzmann equation for carrier transport

    I am little bit confused about derivation for Boltzmann equation for electron look at this link http://relativity.livingreviews.org/Articles/lrr-2008-10/articlesu25.html which is final boltazmann equation ?
  11. A

    Material for Quantum Transport

    Hi all, I want to learn Quantum Transport materials . I would like to know some good material to start with and also I want to learn NEGF formalism. please suggest me some good books that teach from fundamentals in these areas.. Thank you ...!
  12. S

    MHB Solving Transport Eq. for Level Curves: x=X(t)

    I have this equation ux(x,t) + c(x)ux(x,t) = 0 x>0 I want to obtain information on how the initial input uo(x)=u(x,o) would deform when the sound speed is not constant. c(x) is the sound speedi wanted to start this by finding a DE for the level curves x=X(t) so that i can solve in terms the...
  13. O

    MHB Scaled transport equation

    am given a scaled transport equation ut(x,t) + ux(x,t)=0 x>0; t>0 u(x,0)=0 x>0 u(0,t)= sint t>0 how can I begin to find a solution in the quadrant {x.0,t>0} to this problem, am really struglling:(
  14. O

    MHB Diffusion and transport equation

    ut(x,t) + c(x) ux(x,t) = 0 I was given the equation above and c is said to be the propagation velocity and not constant what do they mean when they say i must use a method of characteristics to show that the above equation will be an ordinary diff equa
  15. C

    Thermal transport in graphene

    Published values for the room temperature thermal conductivity of graphene vary from ~2000 W/m*k to 5600 W/m*k, for freely suspended samples. The large discrepancy shows the sensitivity of graphene to lattice defects (contact with substrate, edge defects, etc.) Thermal conductivity increases...
  16. W

    Energy transport through deep convection

    Hi everyone, I am currently undertaking my honours year in physics focusing on atmospheric physics. I am wondering if anyone knows where I can get a model to determine how much energy is moved to the top of the troposphere by deep convective "hot towers". I wish it was as simple as...
  17. D

    Parallel transport around a loop

    From the Wikipedia article on the Riemann curvature tensor: The last sentence assumes that ##\tau_{sX}^{-1}\tau_{tY}^{-1}\tau_{sX}\tau_{tY}## returns Z back to x0. It isn't obvious to me that this should be true. My guess is that this is true because X and Y commute, but I can't think of a...
  18. P

    Equation for parallel transport involving sectional curvature

    This is an expression I came across in a paper I am going through. It involves an expression for the parallel transport of a tangent vector taking into consideration the sectional curvature of simply connected space-forms in \mathbb R^4 . I have not been able to derive it.The equation simply...
  19. K

    High-Temperature Superconductor Transport

    I am starting to work with the high temperature superconductor BSCCO (Bi–Sr–Ca–Cu–O). I have read that the carriers of superconducting current is hole pairs. (As opposed to electron-pairs in normal superconductors) I am trying to understand how the transport would work. If I contact it with...
  20. Hyo X

    Crystallinity and electron transport

    Say we have an electron traveleing in a crystalline conductor. It can scatter off of defects such as vacancies, interstitial atoms, grain boundaries, etc. Is there a way to quantify the relationship between conductance and defect density? I.e., if I want to build a 2D crystalline...
  21. L

    Geometric phase of a parallel transport over the surface of a sphere

    I have this question on the calculation of the geometric phase (Berry phase) of a parallel transporting vector over the surface of a sphere, illustrated by Prof. Berry for example in the attached file starting on page 2. The vector performing parallel transport is defined as ψ=(e+ie')/√2...
  22. pellman

    How do we parallel transport a vector?

    Given a curve c(τ) with tangent vector V, a vector field X is parallel transported along c if \nabla_V X=0 at each point along c. Let x^\mu(\tau) denote the coordinates of the curve c. In components the parallel transport condition is \frac{dx^\mu}{d\tau}\left(\partial_\mu X^\alpha +...
  23. J

    Would it be possible? - A fifth mode of transport

    Would it be possible? -- A fifth mode of transport... There has been a lot of talk about developing a fifth mode of transport, and most of these involve some sort of tube such as the hyperloop idea from Elon Musk. Now I don't know why but I have the idea stuck in my head that the fifth mode of...
  24. S

    Considering spin in the transport of nanoscale devices

    Hi, The transmission of nano devices are generally done without cosidering the spin polarization. However, as I saw in some papers, the effect of spin is sometimes included. How can I decide to use spin or not when simulationg transmission of nanoscale devices? Thanks in advance...
  25. atyy

    Fermi-Walker transport and gyroscopes

    In GR, the geodesic equation for a test particle can be seen in 2 ways. (1) It is a fundamental postulate consistent with the EP that is experimentally verified. (2) It is derived from more fundamental postulates such as the Hilbert action with minimally coupled matter as an approximation...
  26. A

    Hyperloop - essentially new transport

    One of these days on the TV I have seen news which has shaken me: Elon Musk has decided to intrigue the world - has declared that will soon open the project of essentially new personal transport. Which will move with speed of a sound, but will be cheaper than the plane . The construction cost...
  27. R

    Transport Equation IVP Solution

    Homework Statement Hi guys, I'm having trouble with a homework problem: I will have to solve for the IVP of a transport equation on R: the equations are: Ut-4Ux=t^2 for t>0, XER u=cosx for t=0, XER Homework Equations transport equation The Attempt at a Solution...
  28. R

    PDE for IVP on R for a transport equation

    Hi guys, I'm having trouble with a homework problem: I will have to solve for the IVP of a transport equation on R: the equations are: Ut-4Ux=t^2 for t>0, XER u=cosx for t=0, XER I've actually never seen a transportation problem like this and any help would be...
  29. K

    Calculation of neutron transport cross section

    I have a book on nuclear reactions which details the mean free paths for thermal neutron scattering as: 0.37cm for water and 2.2cm for heavy water The transport cross sections are listed as 0.45cm for water and 2.6cm for heavy water. Does anyone know how to calculate these from the thermal...
  30. D

    Maxwell-Boltzmann distribution for transport equations

    I have to calculate the transport coefficients for the Maxwell-Boltzmann distribution. But I'm not sure what distribution I have to use. As far as I know it should not be the MB distribution for v-space (Velocity) or E-axis (Energy), since that will get me the wrong dimensions in the end. I...
  31. I

    Could projectile motion be used for mass transport?

    Discussion
  32. L

    Mass Conservation and Reynold Transport theorem for Non Uniform flow

    Homework Statement I will honestly be so grateful if someone can explain this to me. I am studying the Reynolds transport theorem, particularly mass conservation. I have read over my notes and I really do not understand how to calculate the mass flow rate through the control surface if it...
  33. jtbell

    Critters on a Transport Vehicle

    You've heard of "Snakes on a Plane", right? How about roaches on a bus? :yuck:
  34. A

    Size of pipe needed to transport helium problem

    Homework Statement An engineer is designing a system that requires transporting .01 m^3/s of helium at 15°C and 120 kPa. The velocity of the pipe is limited to 40 m/s. What size (diameter) of pipe is needed? My question is what equation do i need to solve this problem? Homework...
  35. E

    Specifications of active transport.

    In neurons during re-polarization ATP is used to "actively transport" Na ions out of the cell and K ions into the cell. Does this mean that the ions are flowing against their concentration gradient or the word "actively transported" is just used because ATP is used in this process?
  36. D

    Nanoscale Energy Transport: Speed of Electron Gas in Semiconductor (Chen: 1.10)

    Before I ask the question, let me explain a little bit about myself. I graduated just over a year ago with a bachelors in Physics, and am now starting my first semester of grad school in Energy Engineering. I have been out of practice, and am facing major struggles getting back into my...
  37. Astronuc

    Transport Phenomena by Bird, Stewart, Lightfoot

    Author: R. Byron Bird, Warren E. Stewart, Edwin N. Lightfoot Title: Transport Phenomena, Revised 2nd Edition [Hardcover] Amazon Link: https://www.amazon.com/dp/0470115394/?tag=pfamazon01-20 Prerequisities: Advanced Calculus, Differential Equations (ODE, PDE), Introductory Heat Transfer...
  38. C

    Transport phenomena or diffusion book for physical sciences

    I am a graduate student in physics. Can someone recommend a book that explores transport phenomena or diffusion from a physical sciences (instead of engineering) point of view? I would like that because I'm not dealing with industrial equipment and don't want to spend chapters wading through...
  39. E

    3D Transport and Adsorption model on Comsol

    Hi everyone, I'm trying to design a simple model by using Comsol Multiphysics. I set an inlet concentration of a species "cp" that will be adsorbed to a circular surface located at the center of the microfluidic cell (I named the concentration of adsorbed protein "cpl" ). I used laminar flow...
  40. P

    Does torsion make parallel transport direction dependent?

    Torsion has propped up in a couple of recent threads, but none of my texts really cover it well. Does torsion make parallel transport direction dependent? I.e. if we parallel transport some vector v "forwards" along a curve, and then "backwards" along the very same curve to its starting...
  41. Q

    Horizontal lift, or parallel transport

    Hello, everyone! I'm studying Nakahara's book, Geometry, Topology and Physics and now studying the connection theory. I come across a problem. Please look at the two attachments. In the attachment , Nakahara said we could use the similar method in the attachment to get \tilde X, but why...
  42. R

    Exploring Semi-Porous Transparent Membranes for Glucose Transport

    Hi! My friends and I have been working on a project which encapsulates the use of semi porous transparent membranes that can selectively pass glucose molecules through them in one direction. Does such a membrane already exist? Where can I get literature on the construction and/or existence of...
  43. S

    Free electron Theory and Boltzmann Transport equation

    Hello! I have two questions for knowledge. Q) Explain under what conditions Maxwell Boltzmann and Fermi Dirac statistics are applied on free electrons. Q) Explain each parameter of Boltzmann Transport's equation. Thank you in advance. :-)
  44. F

    How to understand Parallel Transport

    I'm listening to Prof. Leonard Susskind's lectures on GR on youtube.com at http://www.youtube.com/watch?v=hbmf0bB38h0&feature=relmfu He's trying to explain how to visualize parallel transport of a vector. But I'm having a hard time of it. I think I understand it. Let me know if I got it...
  45. L

    Horizontal Lift vs Parallel Transport in Principal Bundle & Riemannian Geometry

    I am a physicist trying to understand the notion of holonomy in principal bundles. I am reading about the horizontal lift of a curve in the base manifold of a principal bundle (or just fiber bundle) to the total space and would like to relate it to the "classic" parallel transport one comes...
  46. T

    Could Gravity Transport Energy?

    I've heard that gravitational fields carry energy themselves, and are therefore a source for their own existence. I take this as a "pre-requisite" of a sort for gravitational waves. If I were to shoot a high energy laser in space and cause a rippling effect of space-time. Could somebody...
  47. J

    The future of the automotive industry and transport in the us?

    The future of the automotive industry and transport in the us? Why will Americans never fully take to rail? Because we are adventurers by nature. The people that came to this Country had adventure in their blood. We like our cars, and we like em big and fast. So then I tell you Rail is the...
  48. N

    Applying Reynold's Theorem to Infinitesimal Element: Fluid Dynamics

    So Reynold's transport theorem states that \frac{\mathrm d}{\mathrm d t} \int_{V(t)} f \; \mathrm d V = \int_{V(t)} \partial_t f \; \mathrm d V + \int_{V(t)} \nabla \cdot \left( f \mathbf v \right) \; \mathrm d V. Now I would expect (on basis of conceptual reasoning) that if I were to apply...
  49. K

    Parallel transport and geodecics

    So from what I understand if you pass a vector (using parallel transport) through a closed curve where there is curvature in the interior, the vector will come back not to it's original vector but with a changed sense. However if the vector is on a geodesic it will not change its sense after it...
  50. R

    Coordinate-independence of equation for the parallel transport

    Homework Statement Please show that the defining equation for the parallel transport of a contravariant vector along a curve \dot{\lambda}^a+\Gamma^a_{bc}\lambda^b\dot{x}^c=0 is coordinate-independent, given that the transformation formula for the christoffel symbol being...
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