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.

View More On Wikipedia.org
Recent contents Top users
  1. C

    Archived Heat equation and energy transport.

    Homework Statement I have a rod of density \rho and length l. It's located at 0\leq x\leq l . The density of internal energy per mass is E = c(T-T_0) + E_0 where T is the tempertature in Kelvin, E_0 is a constant and c is the specific heat capacity. We assume that the temperature is not...
  2. Q

    Physical intuition behind geodesics and parallel transport

    Hi all, Sorry if this is a dumb question, but what exactly do we mean by the term parallel transport? Is it just the physicist's way of saying isometry? Also, in my class we have just defined geodesics, and we're told that having a geodesic curve cis equivalent to demanding that the unit...
  3. R

    Transport mechanical energy waves

    Homework Statement I don't even know where to start with this problem Someone please help A sound source sends a sinusoidal sound wave of angular frequency 3000 rad / s and amplitude 12.0 nm through a tube of air. The internal radius of the tube is 2.00 cm. (a) What is the average rate at...
  4. A

    Unraveling the Mystery of Gyro and the Transport Theorem

    Gyro seems to weird when i think abt it using the transport theorem. i mean for a spinning dish, symmetric one, {Total moments acting on it} = Hdot + w x H --- (1) where H is the angular moment of the dish, w is its angular velocity. then when i consider that it spins inside a box...
  5. E

    Active Transport? Get Answers Now!

    Hi Can anyone throw some light on active transport? need urgent help. Thanks in advance
  6. S

    Piezoelectricity-charge transport

    Hi, In papers discussing the physical properties of semiconductors, I have found that they have calculated the piezoelectric coefficient as the ratio between the polarization and the strain in a linear regime (which produces e): a) I think in experiment we first insert an electric field...
  7. T

    Solving a Salt Transport ODE: Find Salt After 10 Minutes

    Homework Statement I've attached the relevant pictures. The question is: Let X,Y be two containers. At t=0, container X has 100 lt. of water with 2 kg of salt in it and Y has 100 lt. of water with 6 kg of salt. On each t>0, the system transports water as the you can see in the picture...
  8. D

    Parallel transport and geodesics

    A vector field is parallel transported along a curve if and only if the the corariant derivative of the vector field along the path is 0. That is \frac{d}{d\lambda} V^\mu + \Gamma^\mu_{\sigma \rho} \frac{dx^\sigma}{d\lambda} V^\rho = 0 This is basically what every book says. But what...
  9. Saladsamurai

    Reynolds Transport Theorem Notational Issue

    Perhaps someone can clear up some confusion for me. EQs (1) and (2) are synonymous, but use different notations for the derivative. In my textbook, the RTT is written in the following form: Given some fluid property 'B,' let \beta be the intensive property \beta = d\, B/d\, m. Then the rate...
  10. M

    General Biology - Simple/Facilitated Diffusion & Active Transport

    Homework Statement (Last one!) I think I filled out this table correctly, I just want someone to check over it for me, if you would :) Oxygen enters cells by simple diffusion, glucose enters most cells by carrier assisted (facilitated) diffusion, the sodium/potassium pump removes sodium...
  11. S

    What is secondary active transport?

    Hello, Ok I researched it but I don't understand. What I understand is that when one molecule normally diffuses(high to low) another molecule from a (low to high gradient) attaches to the carrier protein. How does this molecule attach without ATP? I don't get it. Any help would be...
  12. C

    Questions about ANC and Transport Theory

    I'm currently enrolled in a course in which we will be modeling parts of a nuclear reactor utilizing Westinghouse ANC code. Here are my questions: My professor said we will be doing coding on Unix-based machines; so, does that mean the ANC code is FORTRAN 90 based? Secondly, when...
  13. C

    Refrigeration: The Equivalent Rate of Transport of Heat in Watts?

    A 1.2 ton air conditioner has the capacity to freeze 2400 lb of ice at 0°C in a day. What is the equivalent rate of transport of heat in watts? QH(out)= QL(in) + Wi Coefficient of Performance= QL/ (QH-QL) Coefficient of Performance of an Ideal System: TL/ (TH-TL) QL/QH= TL/TH I...
  14. J

    Answer check transport equation (1st order linear PDE)

    Homework Statement Hi everyone, I just wanted to double check if I've solved this correctly? Given: \left.\frac{du}{dx} + sin(x)\frac{du}{dy} = 0 \left.-\infty < x < \infty y > 0 \left.u(\frac{\pi}{2} , y ) = y^{2} Solve the PDE Homework Equations Method of characteristics The Attempt...
  15. P

    3 Law on Reynolds momentum transport equation

    I want to know how Reynolds Equation of Momentum is accord with the 3rd law of Newton, the law of action-reaction forces. For an ideal fluid, we have that [tex] \frac {\partial m \vec {v}} {\partial t} = \vec v [ \frac {\partial {\rho }} {\partial t} + \nabla [ \rho \vec v ] + \rho [\frac...
  16. W

    Parallel transport analog of Stoke's theorem

    In a Stokes theorem, the integral of all curls of a vector field enclosed in some region is equal to the line integral around the boundary. I'm wondering if a similar theorem exists for parallel transport. The Riemann curvature tensor gives a change in a vector when parallel transported...
  17. C

    How electron transport in conductors

    Say we have a solid wire made of Cu. It seems most electrons transport at the surface of the wire. Right? So is there any difference of the resistance if we have a hollow Cu wire (same diameter with the solid wire). I think the answer shoule be "yes". Right? Becasuse, the resistance R=p*L/A (p...
  18. S

    Passive Transport Homework: Solving Diffusion Problems

    Homework Statement 2. The attempt at a solution a) The particle seems to be 50 nm in diameter, so D = \frac{k_BT}{6 \pi \eta R} = 4.4E-12 m^2s^{-1} b) j_{diff}=-D\frac{dc}{dx} = -4.4E-12 \cdot \frac{dc}{dx} I don't know what to do next...Can I assume c(x) = c_0x...
  19. M

    Understanding Parallel Transport and its Implications for Coordinate Systems

    I'm a bit confused about parallel transport. We demand that the absolute covariant derivative of our (generalised) coordinates is zero along some curve in some frame. Does this really make our vector stay parallel? What if these coordinates were angles or some other general curvilinear...
  20. M

    How Can I Solve a Transport PDE with Numerical Methods and Boundary Conditions?

    Here's my question, friends I have to define initial and boundary condition for a transport PDE: u_t+x(1-x)u_x=0 with x and t is between [0,1], to solve this equation, what kind of numerical method and boundary condition do you recommend and why? What kind of numerical error do you...
  21. M

    About solving Transport PDE

    Here's my question, friends I have to define initial and boundary condition for a transport PDE: u_t+x(1-x)u_x=0 with x and t is between [0,1], to solve this equation, what kind of numerical method and boundary condition do you recommend and why? What kind of numerical error do you...
  22. C

    Basic Quantum Transport Question

    Hi dears, I'm following the book of Datta named "Quantum Transport: Atom to Transistor". But just at the beginning, I'm confused a bit;) In the book, at chapter 1, there are some equations given for the current in nanotransistors, for example, an equation for a system with density of...
  23. A

    Help needed transport problems involving bessel eqn

    Hi everybody... i would like to seek help for the problem below. the assumptions I've considered is that transfer is radial only since it is a very long cylinder (infinitely long) that transfer in z direction is negligible, thermal radiation is zero, and wood properties are constant. Starting...
  24. O

    Measuring curvature with parallel transport

    Parallel transport, as one means of quantifying the curvature of a coordinate space, enables changes in a vector's components, when it is carried around variously oriented loops in that space, to be properly measured, i.e. by comparisons made at the same location. Those changes which are...
  25. I

    Obtaining the connection from Parallel Transport

    How do I obtain the Levi-Civita connection from the concept of parallel transport? So Do Carmo asks to prove that for vector fields X, Y on M, and for c(t) an integral curve of X, i.e. c(t_0) = p and X(c(t)) = dc/dt, the covariant derivative of Y along X is the derivative of the parallel...
  26. J

    A question regarding relativity and information transport

    i posted this also in general physics, but I'm posting it here as well. sorry if I'm breaking the community rules Well this is not my question, but i thought i would ask this in this forum to find a solution regarding the same. Imagine a very long rod that extends between the Earth and...
  27. J

    Harmonicity in phonon transport

    Well again I'm very new to the field of solid state physics. I understand that phonons are the lattice vibrations which are transferred from one atom to another. In case of harmonic vibration, the phonons are similar to the elastic spring and the atoms are considered like the balls attached to...
  28. S

    Surface Greens' function in coherent transport calculations

    Hi, I've been reading these forums for quite a while and now it seems like a good moment for my first post. I'm doing simple coherent transport calculations in tight-binding approximation. The device Hamiltonian matrix H_D is connected to two ideal leads, characterized by the unit cell lead...
  29. D

    Could light be a media for transport?

    Could light be a media for transport? I realize that light is a wave, but isn't also a particle? I mean if air can be used as a media, then why can't light, they are both particles.
  30. P

    Parallel transport on the sphere

    Homework Statement Consider a closed curve on a sphere. A tangent vector is parallel transported around the curve. Show that the vector is rotated by an angle which is proportional to the solid angle subtended by the area enclosed in the curve. The Attempt at a Solution First, I parametrize...
  31. J

    Renyolds Transport Theorem from Navier-Stokes?

    I've been trying to figure out how I can start with the Navier-Stokes equation and end up at the Reynolds Transport Theorem. Could anyone provide a link to a derivation of this? or some advice of some sort?
  32. P

    (Biology) Cell Transport Methods & Mitosis in Animals

    Hi guys, Some background : I'm in the early stages of my first semester of High School Biology and I'm already having some problems coming to terms with the basics. Our original teacher was in car accident over break so we're stuck with a sub, who's a spanish teacher and completely hopeless...
  33. D

    Parallel transport in flat polar coordinates

    If we have as a manifold euclidian R^2 but expressed in polar coordinates... Do any circle centered at the origin constitute a geodesic? Because I think it parallel transport its own tangent vector.
  34. J

    Parallel transport approximation

    The parallel transport equation is \frac{d\lambda^{\mu}}{d\tau} = -\Gamma^{\mu}_{\sigma\rho} \frac{dx^{\sigma}}{d\tau} \lambda^{\rho} If I take the derivative of this with respect to tau, and get \frac{d^2\lambda^{\mu}}{d\tau^2} =...
  35. ZapperZ

    U.S. DOT Bans Transport of Spare Lithium Batteries in Checked Baggage

    This is something you might want to take a look before you go off on your next air travel in the US. http://www.powerpage.org/2007/12/us_dot_bans_transport_of_spare_lithium_batteries_in_checked_baggage.html This is going to be a bit annoying since we travel with spare camera and camcorder...
  36. Ivan Seeking

    ZIL Screws You: Russian Heavy-Duty Transport Vehicles

    http://jalopnik.com/cars/siberian-screwjob/in-russia-zil-screws-you-273231.php The US made one of these but I couldn't find any file footage. The videos are slow to load but do work eventually.
  37. S

    Finding the Best Pump for Nickel Slurry Transport

    hi guys. I need some basic information about a pump that will be able to transport a nickel slurry up around 1-2m high. the mass flow rate of the slurry is 27 kg/s with a density of 1218 kg/m^3. the temperature of the slurry is 25 deg c. What is the best type of pump to use in this...
  38. A

    Design of a transport carriage

    Homework Statement Sir i want to design a transport carriage for carrying tea leaf. The carriage will be made of hollow MS pipes which will be fitted on a trolley driven by tractor. The column willbe fitted 2.5 ft apart vertically and parallel to each other along length and breadth. There...
  39. M

    Reynolds Transport Theorem and Conservation Laws.

    The Reynolds Transport theorem (RTT) is usually applied to derive the conservation of mass, momentum and energy in a fluid. But when I try to apply the RTT to other physical quantities, I get weird results. Can anyone see where I'm going wrong? As a simple example, take the physical...
  40. J

    Microscopic transport equations

    Hi, I'm working my way through Klimontovich's `statistical mechanics' and I'm having trouble with his derivation of the microscopic transport equation: \frac{\partial N(x,t)}{\partial t} + \mathbf{v} \frac{\partial N}{\partial \mathbf{r}} + \mathbf{F}^M(\mathbf{r},t)\frac{\partial N...
  41. P

    Build a Modular Block That Harnesses Light

    Hi everyone, I am working on a school project and have a question for you all. :) I want to build a modular block that receives, transmites and emites light. http://img292.imageshack.us/img292/8446/untitled1st6.png My main idea is installing a solarpanel/lux receiver just above a room...
  42. S

    Designing a Vehicle Powered by One Rubber Band to Transport an Egg

    i need some help. i am supposed to design a vehicle that is powered only by one standard rubber band to transport an egg to the greatest possible horizontal displacement without breaking the egg. the vehicle can't have any rotating parts. must be constructed from basic parts (ie not...
  43. H

    What is the Effect of Influx and Efflux in Reynolds Transport Theorem?

    Hi all! I am confused about the theorem quite much. The theorem says that the time rate of change of a property of a system is equal to the local rate of such property in a control volume plus the efflux of the respective intensive property across its control surface. I am wondering the...
  44. M

    What is the Monte Carlo Method for Simulating Neutron Transport using MPI in C?

    Can anyone hepl me with this?I need some web resource,to start learning from scratch.
  45. A

    Designing a Water Transport System: Up to 10L, 3 Meters, No Kits

    need ideas for a contraption that will transport up to 10L of water across a 3 meters on a counter surface. Further Design Considertions: No kits or animals may be used. Propulsion device that you design make must made from simple compoents such as springs, elastics ect. Device may...
  46. N

    Transport fundamentals question

    Consider a point in space r(vector) where the flux is isotropic; i.e., equal numbers of neutrons move into solid angles d(omega) about every direction omega. a) Show that the net current J(r) is zero b) Show that the magnitude of the current in any direction is just one quarter of the scalar...
  47. H

    What is the role of phonons and electron gas in heat transport in micro scales?

    hi all! I am not a physics but enginereing major. I am confusing about what's going on with heat tranport in micro- scales. I encounter terms like phonon-electron interaction, electron gas, lattice etc.. What exactly is a phonon? does it posses mass? What is electron gas? Could anyone...
  48. J

    Christoffel symbol+covariant derivative+parallel transport

    So, I understand in order to evaluate the proper "derivative" of a vector valued function on a curved spacetime manifold, it is necessary to address the fact that the tangent space of the manifold changes as the function moves infinitesimally from one point to another. Therefore, you cannot just...
  49. S

    Exploring FTL Transport Using Singularities

    i don't know where to put this so feel free to move it: I wolud like to discuss ways of Faster than light transport using singularity based forms. (not in reality, only good ways of doing it) thers always the basic one of: ship> }-----------worm hole----------{ but what about...
  50. A

    Why do ion and electron transfers in ceramics always add up to 1?

    Why for any material, the number of ion transfers plus electron transfers equal 1?
Back
Top