Response Definition and 538 Threads

The dose–response relationship, or exposure–response relationship, describes the magnitude of the response of an organism, as a function of exposure (or doses) to a stimulus or stressor (usually a chemical) after a certain exposure time. Dose–response relationships can be described by dose–response curves. This is explained further in the following sections. A stimulus response function or stimulus response curve is defined more broadly as the response from any type of stimulus, not limited to chemicals.

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  1. R

    Frequency Response Function analysis in ANSYS

    Hello Can anybody please help me to perform a Frequency Response Function analysis in ANSYS many thanks in advance
  2. B

    Linear Time Invariant System Response

    Homework Statement The Relationship between the input x(n) and the output y(n) for the discrete System A is described by the expression: \frac{x(n) - 2x(n-1) + x(n-2)}{2} What is: (i) The impulse resopnse function h(n)? (ii) The frequency response function H(f)? (iii) The aplitude...
  3. E

    Solve Electrical Circuit Problem: Find Forced Response Vx

    Homework Statement I don't have access to a scanner so I will just say it, it's simple. An independent current source pointing up, in parallel with a dependent current source pointing up, in parallel with a capacitor. The independent current is providing the signal: i_s(t)= \sqrt{2}...
  4. L

    AP Environmental Science Free Response

    on a free response question, i need to know how to plot crude birth and death rates. is it as easy as just plotting numbers? what should be the x and y axes? help!
  5. U

    Does anyone have solutions + questions of AP physics B free response

    Does anyone have solutions + questions of AP physics B free response questions thanks for your help
  6. H

    MOS capacitor transient response

    Hello. Suppose we have a MOS capacitor (n-substrate). When we give negative voltage the majority carrier (electrons) are repelled from the oxide-substrate interface and move towards the bulk. Say the bias is -0.3 volts. The substrate is depleted and in steady-state. Suddenly if the bias...
  7. S

    How can I incorporate a loud bang, silver mirror, and green fire in a skit?

    Hey, this is not a brain teaser but i figured that creative people must visit this fprum so i thought I'd see what ideas I would get. I need to prepare a skit of any genre that incorporates a loud bang, a silver mirror or silver bottle and green fire and smoke. Three totally different things in...
  8. D

    Medical Emotional response when listening to instrumental music

    When listening to instrumental music, do the specific chords/tones/cadences trigger specific emotional respone from the brain, or would any emotions attached to music be related to an experience related to that music. ie. would E- to D+ trigger a specific emotion, or would it depend on each...
  9. S

    Impulse Response In A Discrete System

    Hey guys, this is my first post and I'm looking for a bit of help This is going to sound really easy (and I know it is) but I can't for the life of me remember how to work out the Impulse Response Function of this system. I've tried google for a few hours but nowhere that gives it in laymans...
  10. D

    How to Derive and Sketch the Frequency Response Function in an RC Circuit?

    Homework Statement The relationship between the input voltage V(t) and the output voltage across a resistor VR(t) is:- CR dVR /dt + VR = CR dV/dt Circuit diagram of a capacitor and resistor with VR(t) in series across V(t) 1. Show that the frequency response function G(iw) (w= omega)...
  11. D

    Can the Forced Response of a Differential Equation Be Verified?

    Homework Statement For the differential equation: x'' + cx' + kx = F_{0}cos(\omage t) verify that the forced response takes the form, x_{f}(t) = Ccos(\omega t - \delta) Homework Equations C = \frac { F_{0} } {\sqrt {(k- \omega ^{2})^{2} + c^{2} \omega ^{2} } }...
  12. H

    Need help with this problem involving system response

    Homework Statement Jerry, the “handy-man,” has a shop that makes precision molds, and he wants to be able to produce these molds on site when a client’s product fails. He installs this equipment to the bed of an old truck. Later on, during the summer months, it becomes too unbearably hot to...
  13. D

    How to Determine the Mass Percent of Sulfate in an Unknown Salt?

    Hey, I have a worksheet due tomorrow for my chem class and it includes #9 from the 1997 FR AP Chem Test. I can't figure it out! Any help would be appreciated! Here goes: An experiment is to be performed to determine the mass percent of sulfate in an unknown soluble sulfate salt. The equiptment...
  14. S

    3D Collision dection and response

    I am making the physics engine for a personal project, and one of the more important parts is that the collisions are detected and respond as accurately as possible. right now I'm in the preliminary phases of designing this, so I'm sticking to basic shapes, axis aligned boxes, axis aligned...
  15. P

    BJT amplifier frequency response.

    Today I did a lab on BJT amplifier frequency response. I got the fc1 and fc2,BW and F0 center frequency. The band pass turned out to be asymmetrical. What i want to know is this. Input V=40mVpp output V=2Vpp cut off V=1.41Vpp When I turned up the frequency to 2fc2, i got about...
  16. M

    Engineering Natural response of an RC circuit with two capacitators.

    Homework Statement I'm supposed to find the voltage v0(t) for t > 0 for the following circuit: http://img516.imageshack.us/img516/5858/circuitta7.jpg Homework Equations The first part of the excercise was to find the current io(t). I did this by using the node-voltage method to find the...
  17. wolram

    Is Science Selfish? Exploring the Human Response to Theoretical Science

    Is, selfish, if it does not give some immediate or short term advantage no one gives it a thought, how many of the total population of Earth give a single thought to some grand unification theory?
  18. K

    Where Am I Going Wrong With This LTIC System Response?

    Homework Statement for an LTIC system described by the transfer function H(s)=\frac{s+2}{s^2+5s+4} find the response to the following everlasting sinusoidal inputs: 5*cos(2t+30 degrees) The Attempt at a Solution H(jw) = \frac{jw+2}{4-w^2+j5w}...
  19. M

    Signals and Systems: Response of LTI systems to Complex Exponentials

    How will we evaluate the integral for calculation of Amplitude Factor for an LTI system for which the input and output are related by a time shift of 3, i.e., y(t) = x(t - 3) The answer is: H(s) = e^(-3s) I want to understand the Mathematics behind the evaluation of the integral...
  20. V

    Black hole gravity response question

    Can anybody tell me if there are any puzzles or anomalies with respect to candidate black holes? For example if we have a binary system that looks like this: o O where the o is a candidate black hole and the O is a star of some typical type and mass, one would observe each object...
  21. N

    How Do You Balance the Reaction Between Nitric Acid and Calcium Carbonate?

    Homework Statement My questions pertain to #4b of the free response. Question: Excess nitric acid is added to solid calcium carbonate. The question asks to predict a balanced equation for this reaction. The Attempt at a Solution what I wrote down was: H+ + CO3 ----> H2O...
  22. ranger

    How to Plot Frequency Response of a Power Supply Using SPICE?

    I'm trying to plot the frequency response of a power supply I've designed. Here is the netlist (made using Spice OPUS): PowerSupply v1 4 5 dc 0 sin(0 34 60) D1 4 2 1N4007 D2 0 5 1N4007 D3 5 2 1N4007 D4 0 4 1N4007 c1 2 0 1000u c2 2 0 100n cout out 0 100n radj adj 0 5k r1 out...
  23. T

    Engineering How do we find the frequency response for a circuit

    Homework Statement How do we find the frequency response for a circuit (RLC / transformer ckt)? If i have its * resonant frequency * Q factor * bandwidth Homework Equations just a general question The Attempt at a Solution like my other post but i have all the answers to the first parts...
  24. C

    Frequency Response: Inputs & Effects

    Hi everybody, I had a simple question that I've never really thought about until I actually had to do it... If you input a single one frequency signal, will you get a whole new different frequency response? How would it effect the system? Or would it make sense if you inputed like a...
  25. F

    Unit Step Response: Solving s(t) = e^{-t}u(t) for u(t) - u(t-2)

    The step response of an LTI system is given by s(t) = e^{-t}u(t) . Find its response to the input u(t) - u(t-2) . Note: u(t) is the unit step function. So I have the solution, but I do not understand it. y(t) = s(t) - s(t-2) = e^{-t}u(t) - e^{-(t-2)}u(t-2) I really don't...
  26. C

    Smolin's Response to review by Joe Polchinski

    Here is the link: http://www.thetroublewithphysics.com/Response%20to%20Polchinski.html"
  27. F

    Where can i get the answer keys for AP Chemistry Free Response Questions?

    Hi, I'm taking AP Chemistry right now and will be taking the Ap Chem Test on May 15. Recently I've found some Ap chemistry free response questions from 2002 to 2006 on [PLAIN]www.Collegeboard.com;[/URL] however they don't have the answer keys to those questions and I'm just clueless on most of...
  28. H

    AP Mechanics Free Response Problem

    Homework Statement A ball of mass M is thrown vertically upward with an initial speed Vo. It experiences a force of air resistance given by F=-kv, where k is a positive constant. The positive direction for all vector quantities is upward. Express all algebraic answers in terms of M, k, and...
  29. H

    Need Help with AP Physics Free Response Questions?

    Homework Statement Homework Equations The Attempt at a Solution
  30. G01

    Waiting on REU Application: Anxiously Awaiting a Response

    I'm waiting on this REU application. They sent me an email last week asking me if I was still interested in a position. I told them yes, but have yet to hear back from them. I called them on Tuesday, they said that they hoped to make their final decisions by the end of the week. AHHHHH! Just...
  31. P

    AP Free - Response Question HELP iNCLUDES angular velocity and acceleration

    AP Free - Response Question HELP! iNCLUDES angular velocity and acceleration http://www.fayar.net/east/Teacher.web/Math/young/APPC/APPC%201999/physics_c_m_99.pdf Mechanics 3 is the problem I really need help on. I tried to find the tension of the string by setting it equal to mg + Iwr, but...
  32. C

    How Does Skin React to Temperature Changes?

    How does our skin respond to changes in temperature?
  33. J

    Response of a Single Degree of Freedom System to HArmonic Excitation

    I have been reading "Response of a Single Degree of Freedom System to Undamped system" and have been referring the book on Dynamics of Structures by Anil K. Chopra.I have got the following questions: 1) One , basic question I have is that the author says that an example of a harmonic...
  34. Q

    UCLA Incident: Was the Police Response Appropriate?

    I saw that folks were guessing what percentage of people support the police in the UCLA tasing incident. So I figure, why don't we find out the actual numbers?
  35. L

    Is the Zero State Response Unaffected by Initial Conditions?

    do you guys aggree with this: The zero state response is never affected by initial conditions. thanks
  36. R

    HELP unit-pulse response for the discrete time system problem

    HELP!unit-pulse response for the discrete time system problem Please help me solve these problems. Thank you so much for all your help. Compute the unit-pulse response for the discrete time system 1) y[n + 2] + 1/2 y[n+1]+1/4y[n] = x[n+1]-x[n] (for n = 0, 1, 2) For number 1) the options...
  37. R

    HELP Impulse Response h(t) problem

    HELP! Impulse Response h(t) problem Please help me solve this problem. Atleast the correct answer indication is also very much appreciated. Compute the impulse response h(t) for (dy(t))/dt -4y(t)=x(t) a. y(t) = e^4t b. y(t) = 1- e^4t c. y(t) = e^-4t d. y(t) = 1- e^-4t Compute the impulse...
  38. R

    HELP Unit-Impulse Response for Discrete System problem

    HELP!Unit-Impulse Response for Discrete System problem Please help me solve these problems. Thank you so much for all your help. Compute the unit-pulse response for the discrete time system 1) y[n + 2] + 1/2 y[n+1]+1/4y[n] = x[n+1]-x[n] (for n = 0, 1, 2) For number 1) the options for...
  39. P

    Response Function for a Damped, Linear Oscillator

    I have a damped linear oscillator, originally at rest in its equilibrium position [therefore, x(0)=0 and x'(0)=0]. It is subjected to a forcing function: F(t)/m = {0, if t<0 {a(t/tau), if 0<t<tau {a, if t>tau I have to find the response function. However, when I attempt to find the step...
  40. L

    Optimizing Response Time in Second Order Systems: Tips and Techniques

    hey guys... Say i have a second order system. From this i can establish a peak time, a settling time, and overshoot percentage... but what is my response time - is the settling time? Also is there some sort of rule of thumb for decreseing the response time?? like say, for example...
  41. S

    Meaning of Zero Input/State Response

    Hi, can someone explain to me, in simple terms, what zero input and zero state response mean? I know the terms should sort of be self explanatory in that zero input reponse is the response of a system when there's no input but how does that make sense? This is how I'm imagining it in my head...
  42. L

    Signals and systems - zero state response

    hey something is really confusing me... we are given this impulse response h[k] = 2d[k] +((0.8)^k).u[k] + (2(-0.4)^k).u[k] where d is delta... anyway the question then asks: using the convolution, determine the ZERO STATE RESPONSE for an input signal x[k] = 2u[k+2] - 2u[k-4]. Now...
  43. B

    RLC ckt's underdamped response

    hi... how can i get A cos (omega t) + B sin (omega t) into this form: C cos (omega t + theta) ? does it equal to A+B cos (omega t - 90) ? i know it has to do with the underdamped response of an RLC circuit. i was looking into phasors as well. any help would be greatly...
  44. marcus

    Response to Smolin and Woit books, and other barometers

    There are a lot of barometers to keep track of! :smile: this thread is to try to keep together a bunch of signs of a changing situation in fundamental physics theory research and how it is perceived. I'm particularly interested in what's going on in the open media accessible to nonspecialist...
  45. P

    Impulse Response: Understanding & Applying Maths

    This thread would've fitted in a lot of categories, but as it's the mathematics I can't quite grasp, I decided to fit it here. I'll be treating the discrete case, so I suppose it's precalculus maths. Anyways, I know how to compute problems with the impulse response method, but I'm kinda baffled...
  46. C

    Circuit Response to Gamma Rays

    Hello. Gamma rays are about same wavelength as the diameter of an atomic nucleus. If one was to design a circuit that was resonant at a frequency near that range (say 300,000,000,000,000 MHz), the resonant frequency would not be far from an electron wavelength, so the impedance phase and...
  47. I

    Pressure Response Time for Two-Piston Hydraulic System with Vacuum Space in Tube

    If we had a tube 1 foot long that had two pistons inside it at each end of the tube, Piston #1. and Piston #2. Piston #1. is attached to a hydrolic push Rod, Piston #2. is connected to a movement senser only, the Space between the two Pistons inside the Tube have a Vacuum of 1 Torr between them...
  48. C

    Finding Initial Current and Natural Response in an RL Circuit

    Can anyone please help me slove this example circuit i found. im having a hard time finding the initial current through the inductor and duno how to deal with the dependent source and inductor after the switch is opened.
  49. B

    Time to React: Calculating the Pilot's Response

    A jet is flying 200 feet above a level plain at 800 mph. Suddenly, the ground begins to rise at a 5 degree slope. How much time does the pilot have to raise the nose before the aircraft strikes the ground? I came up with (200tan(85))/(800x1.466) seconds. The 1.466 converts the initial...
  50. S

    Is this Circuit Actually a Second Order in Terms of Transfer Function?

    Hello, I'm studying the attached circuit in my first order frequency response chapter, and I swear this thing is a second order circuit (in terms of the transfer function v1/v2), am I doing something wrong?
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