What is Component: Definition and 567 Discussions

Component-based software engineering (CBSE), also called components-based development (CBD), is a branch of software engineering that emphasizes the separation of concerns with respect to the wide-ranging functionality available throughout a given software system. It is a reuse-based approach to defining, implementing and composing loosely coupled independent components into systems. This practice aims to bring about an equally wide-ranging degree of benefits in both the short-term and the long-term for the software itself and for organizations that sponsor such software.
Software engineering practitioners regard components as part of the starting platform for service-orientation. Components play this role, for example, in web services, and more recently, in service-oriented architectures (SOA), whereby a component is converted by the web service into a service and subsequently inherits further characteristics beyond that of an ordinary component.
Components can produce or consume events and can be used for event-driven architectures (EDA).

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  1. S

    1st stress-energy tensor component for an electric field

    I have recently gone over the derivation of the stress energy momentum tensor elements for the special case of dust. This case just used a swarm of particles. Now that I understand that case, I am now trying to see if I can derive the components for an electric field. I just want you guys to...
  2. J

    Collision -- why there is no parallel component?

    say that a particle collides elastically with a wall 60 degrees from the wall's normal. the force from the wall is along the wall's normal. My questions is why there is no parallel component to the force from the wall since the particles velocity had a parallel component.
  3. H

    How Do I Create a Component Placement File in EAGLE?

    Dear Friends, I have a pcb that I want to prototype. I am requested to send the component placement/designator file. Its supposedly to show components placements on a file. Any idea how can I get it ? I am using eagle ? Thanks a lot in Advance, Regards, Heath
  4. jegues

    Calculating RMS of Fundamental Component for Unknown Periodic Input Signal

    Every 50μs I have access to one sample of an unknown peroidic input signal and I am looking to calculate the RMS of the fundamental component. Is there any convenient ways one can think of doing this?
  5. T

    Zeroth component of Spin 4-Vector

    The spin 4-vector is defined in the rest frame of the particle as s^{\mu}= (0, \vec{s}). Why is the zeroth component of the same zero in this frame?
  6. P

    Vector component of the weight of an object

    Graduated College over thirty years ago. In physics, I recall a a question where one is required to weigh an object beyond the capacity of the scale. The answer involved resting one edge of the object on scale and the other on a separate support higher than the scale such that the object...
  7. D

    Vector component in different co ordinate system

    I am facing difficulty understanding the vecotr component in the 2 different co ordinate systems. Kindly help me. Suppose I have a vector A on the 2d co ordinate system x and y and therefore vector A = Axi + Ayj where i and j are unit vectors along x and y axis. Suppose a new co ordinate...
  8. V

    Component is diagonal in the basis

    Hi, I am analyzing the paper for my thesis and have Equation IF=-1*(1+cos(δ))*cot(θ)*σ_2-sin(δ)*cot(θ)*σ_1 where σ_1={{0,1},{1,0}} and σ_2={{0,-i},{i,0}} are the Pauli matrices The component σ_1 is diagonal in the (1/√2, +/- 1/√2) linear polarization basis and the component σ_2 is...
  9. 0

    What is the name of this electronic component

    file:///Users/ruairimangan-cliff/Desktop/Screen%20Shot%202014-04-23%20at%2017.06.29.png what is the name of this component? (Attached) is it a counter. i can't find the name of it. is there an exact name for this type of the component.
  10. J

    Alloy composition from component densities (Lagrange Multipliers)

    Homework Statement An alloy of gold, aluminum, and copper has a density of 10,000 kg/m3. The alloy contains at least 10% aluminum and 5% copper by mass. The densities for the three metals are respectively ρAu = 19320 kg/m3, ρAl = 2712 kg/m3, ρCu = 8940 kg/m3. Find the maximum and minimum...
  11. J

    How to obtain the low frequency component as accurately as possible?

    I have data sampled at very high sample rate, which means that the high frequency components are probably well resolved. But I also want to look at the low frequency component, how to obtain them as accurately as possible? I do fft directly or I have to do low-pass filter first?
  12. jk22

    Use of component tensor product in quantum mechanics?

    suppose we consider the measurement operator A=diag(1,-1). Then the tensor product of A by itself is in components : A\otimes A=a_{ij}a_{kl}=c_{ijkl} giving c_{1111}=c_{2222}=1, c_{1122}=c_{2211}=-1 and all other component 0. to diagonalize a tensor of order 4, we write ...
  13. M

    Radial component of B field of solenoid

    Hi everyone. I'm having a relatively hard time in understanding Griffith's explanation of why the radial component of a magnetic field of a solenoid should be zero. He says, "If B(r) were positive, if we reversed the direction of the current, B(r) would be negative. But switching I is...
  14. N

    Principal component analysis-matlab

    Homework Statement How do I find the error of the PCA? ||x1hat - x1||^2 + ...+ ||xnhat-xn||^2 so xnhat is the pca one. What is xn?
  15. L

    Best way to present a phase diagram of a 4 component system

    Hullo, I've just only begun looking at phase diagrams of a 5 component alloy and wanted to know if there is a better way to study the phase diagrams of multi-component alloys rather than looking at a multitlude of binary phase diagrams calculated from the alloy system. I'm using Thermocalc...
  16. H

    Component method for vectors

    Homework Statement Use the componant method to determine the total displacement given by the two vectors shown in each diagram. Homework Equations The Attempt at a Solution I thought I just had to find the third unknown side, and use the pythagorean theorem, but I was...
  17. Y

    Solve Mass Suspension by Component Method

    Homework Statement A mass of 100 kg is suspended by two ropes that make an angle of 60 degrees to the horizontal. If a horizontal pull of 200N, in a plane perpendicular to the plane of the other forces is applied find the tensions in the ropes after equilibrium has occurred. Homework...
  18. kini.Amith

    Design of a machine/ machine component

    I have an assignment for which I have to design a machine component (or structure) of my choice after estimating the loads that may arise on normal use. We are expected to use the things we have learned in our Machine Design course like design of clutches, brakes, shafts,couplings,power screws...
  19. 7

    Projected component of F along a line in cartesian question.

    Homework Statement Determine the magnitude of the projected component of F along AC. Express this component as a Cartesian vector.Homework Equations Information I'm working with. The Attempt at a Solution Most of my attempts have proven fruitless. I understand that in order to find a...
  20. G

    Acceleration in 2 component directions

    Homework Statement Find acceleration of 100kg ship using a component solution. Homework Equations Fnet = ma The Attempt at a Solution break into x and y components? so that Fnet for x = 150cos20 + 300cos30 = 100a and so a = 4.01 in x direction. Fnet for y = 150sin20+ 300sin30 =...
  21. B

    Can Adding Resistors Prevent Overvoltage Damage to LEDs and Photodiodes?

    So I am looking at my spec sheets, I am running most of my boards on 5V (Arduino) There are however 5 LEDs that say can have a maximum FV of 1.5V, so I am pretty sure they will fry if I run the 5V through them, there are also 5 Photodiodes that have a 1.3 maximum FV, so they will fry as well...
  22. C

    Can the Z component of an electric field dissipate energy to XY plane?

    Say if I have an EM wave with electric field (x, y, z) = (0, 0, E_z), and magnetic field (x, y, z) = (H_x, H_y, 0). Can this wave's electric field dissipate energy to the XY plane? Like, if I had 2D cells in the XY plane that absorb energy from an electric field, will they gain energy from the...
  23. U

    Component of vector parallel to boundary while calculating divergence

    So when we calculate divergence (especially referring to the gauss divergence theorem), why aren't the components of the vector field parallel to the boundary considered? I mean even of, say fluid, is traveling parallel to the boundary when it comes out, fluid is exiting, or diverging out...
  24. D

    Square of x component of Orbital Angular momentum?

    Homework Statement Solve for ##L^2_x## ##L_x = \frac{\hbar}{i} (-sin(\phi)\frac{d}{d\theta} - cos(\phi)cot(\theta)\frac{d}{d\phi}##** the d's should be partial derivatives, but I'm not sure how to do that symbol. Sorry! Homework Equations Solve for ##L^2_x## ##L_x = \frac{\hbar}{i}...
  25. J

    Proof of the stiffness of the horizontal component of a spring

    Homework Statement Suppose a spring with forces F=k*z. Find the equivalent stiffness of a horizontal spring, where the spring and its horizontal equivalent is separated by theta degrees. The horizontal equivalent presumably will have a force F(x)=k(x)*x Homework Equations F =...
  26. A

    Fourier component crystal potential - physical significance

    I have done several exercises concering periodic potentials in crystal. Especially I did one, where I had to show that the Fourier component of the shortest reciprocal lattice vector (call this vector a) in the z-direction was zero. Now solving the problem was just about writing up the right...
  27. H

    Finding the angle given positive x component and negative y component

    Homework Statement Ax = 3m Ay = -4m Find the angle with respect to the x axis Homework Equations Tan = Ay/Ax The Attempt at a Solution Tan = Ay/Ax = -4m/3m = 1.333333 angle = -53 degrees Is -53 degrees a correct answer or should it be positive 53?
  28. X

    Banked turns; do we use the x component of normal force or gravity?

    I am confused on what the correct way to do this is. In my old physics textbooks, they say that the x component of gravity is responsible for the centripetal force. However, on the internet and for more advanced topics they say it is the x component of normal force that is responsible for...
  29. T

    Component resolution of g on an inclined plane

    Homework Statement Hi, I just had a quick conceptual question. I understand that if I have an object moving down a ramp, it is being accelerated only by gravity. My question is this: We should be able to experimentally calculate g if we measure the acceleration down the ramp. Then we can...
  30. K

    Horizontal component of an electric field at origin

    Homework Statement Calculating the horizontal component of an electric field at the origin of a semi circle. The image link is: http://imgur.com/SXYs4Rp The Attempt at a Solution I've tried using the formula k∏(Q)/r (8.98755*10^9)∏(-7.85*10^-6) / .113 = -1.961 * 10^6. Can anyone see...
  31. AakashPandita

    Confusion regarding the concept of acceleration along a component

    Suppose we have a wedge with angle θ on which there is a block. We are pushing the wedge with the least force required to keep the block stationary. If the acceleration of wedge is A then the acceleration of the block along the inclined plane will be gsinθ+Acosθ=0. That means A is negative. How...
  32. U

    Dispersive Component of Surface Energy

    Hello, I'm doing an MSc project concerned with the treatment of plastic polymers with an μ-APPJ. I have been getting a tonne of results on different plastics using an APPJ of He carrier gas with an Oxygen admixture of 1/2, 1 & 2%. However, in my analysis I'm unsure of what the dispersive...
  33. P

    Linear approximation of a nonlinear component.

    Hello, I am trying to find the effective resistance of the NLR in the attachment (to the first order). It is given that IL = gVL2 + I0. I understand that this is normally achieved via ∂g/∂V at V=V0, but when I do so I get that R should be 1/(2gV0), and not 1/2g as shown in the solution. Could...
  34. R

    Total energy derivation: energy as a time component of a four-vector

    I'm kind of new to special relativity, I mean beyond what they tell you in survey courses. In any case, I've heard there was a relationship between energy and time in special relativity (I've actually heard someone say the "time component" of energy), and I've always been fascinated with E = mc2...
  35. O

    Mechanics~polar coordinate & radial and transverse component

    http://www.answers.com/topic/radial-and-transverse-components From the above link, 1) e θ is a unit vector perpendicular to r in the direction of increasing θ. Where is the direction of increasing θ? Is that a circle? θ Increase from 0 to 2∏.then eθ moves in a circle? direction always...
  36. N

    Find acceleration component to hit target in 2D plane

    Hi. Me and my dad (math teacher) are having some trouble finding the answer to a seemingly fairly easy problem. It is somewhat similar to projectile trajectory math but with the difference that the projectile have an initial velocity and there's no gravity, only acceleration. Imagine the...
  37. SpaceKidd_N7

    Magnetic component of light, natural materials vs metamaterials

    Why is it that the magnetic component of light interacts more with metamaterials than with naturally occurring materials? It would be nice to explain this in terms of inductance, permeability, and permittivity within SRR metamaterials. I'm currently an undergraduate participating in...
  38. L

    Question about L.S component of hamiltonian

    Homework Statement I need to find the energies of the lowest level of the following hamiltonian H = p^2/2m + (mw^2r^2)/2 + L.S (spin 1/2 particle of mass m) The tridimensional harmonic oscilator with a coupling term Homework Equations The first two terms are solved, my...
  39. A

    Problem in Vector Resolution and Component

    I cannot understand what is vector resolution.It is said in the book that ON is the resolved part of A along X axis.It is also known as the x-component of A or the horizontal component of A.Ax may be regarded as the projection of A on X-axis. OM is the the resolved part of A along Y-axis.It is...
  40. M

    Principal component analysis (PCA) with small number of observations

    Dear all, I'd like to apply principal component analysis (PCA) to hyperspectral data (~1000 bands). The number of observations is 200. The estimated variance covarance matrix is singular because the number of observations is smaller than the number of variables. My questions are, Can I...
  41. M

    Engineering Determining component values for tone control circuit

    Homework Statement Your tone control circuit must satisfy the following specifications: 1. peak input signal voltage of 8 V; 2. peak output signal voltage of 8 V; 3. operating frequency range of 20 Hz – 20 kHz (audio band); 4. three tone bands with cut-off frequencies at 200 Hz and 2 kHz...
  42. D

    Fourier series - DC component, integration problem

    Homework Statement Find the Fourier series representation of: f(t)={-t , -∏<t<0 f(t)={0 , 0<t<∏ This is a piecewise function. T=2∏ (the period) Homework Equations a_{0}=\frac{2}{T}*\int_0^T f(t),dt The Attempt at a Solution I need help only with calculating the DC...
  43. M

    Identification of pressure component

    Attached is a picture of a component i am trying to identify. I assume it is either a piezoelectric sensor or a wheatstone bridge, But i don't know which one?
  44. L

    How to solve the x' and y component force

    The device is used for surgical replacement of the knee joint .If the force acting along the leg is 360N determine its component along the x' and y axes... please tell me how to solve...thanks
  45. MacLaddy

    Find the Y component of the electric field

    Hello, The following problem was on a prior test of mine, and I would like to see where I went wrong. My answer was a negative value, and my instructor made a note that the negative was the only part that was incorrect. Please help me understand why this shouldn't be a negative...
  46. R

    Finding the z component of vectors that form a triangle?

    For the vectors in the figure, with a = 1.1 and b = 2.6, what are (a) the z component of a x b, (b) the z component of a x c, and (c) the z component of b x c? Everything I've tried to look up involves vectors that are in unit notation, etc. I just don't understand how to do it when all you...
  47. C

    Understanding Bias in Semiconductor Devices

    Is there not a difference between bias as in "A diode is forward/reverse biased" and establishing the terminal voltages/currents needed to bring say a transistor to the quiescent point? Just curious
  48. F

    Reverse polarity protection circuit. Help with component values?

    EE is not my forte. Although this little circuit is so simple that I could get myself 90 percent there, it performs such an important function that I would like to get it more like 99 percent correct. I want to add the circuit to this board...
  49. H

    Horizontal component of force without angle given?

    Homework Statement A person is dragging a 60kg block at a constant velocity over flat ground. The force applied by the person to the block has components that are up and to the right. The coefficient of friction for sliding the block over the ground is μk=0.60. Calculate the rightward...
  50. H

    Static Equillibrium. [T=0, [F=0? Problem finding force using component

    Taking a physics 12 class in night school and he only gave us an example of a Beam and Wire question where the Wire was holding a Beam against a wall. The wire was at the end of the beam and holding a sign. Using the methods taught, I have been able to understand the Torque = 0, but Forces get...
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