What is Pulse: Definition and 345 Discussions

In medicine, a pulse represents the tactile arterial palpation of the cardiac cycle (heartbeat) by trained fingertips. The pulse may be palpated in any place that allows an artery to be compressed near the surface of the body, such as at the neck (carotid artery), wrist (radial artery), at the groin (femoral artery), behind the knee (popliteal artery), near the ankle joint (posterior tibial artery), and on foot (dorsalis pedis artery). Pulse (or the count of arterial pulse per minute) is equivalent to measuring the heart rate. The heart rate can also be measured by listening to the heart beat by auscultation, traditionally using a stethoscope and counting it for a minute. The radial pulse is commonly measured using three fingers. This has a reason: the finger closest to the heart is used to occlude the pulse pressure, the middle finger is used get a crude estimate of the blood pressure, and the finger most distal to the heart (usually the ring finger) is used to nullify the effect of the ulnar pulse as the two arteries are connected via the palmar arches (superficial and deep). The study of the pulse is known as sphygmology.

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  1. T

    Finding tension given speed of a pulse, length, radius, and time

    Homework Statement A ski gondola is connected to the top of a hill by a steel cable of length 580 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 19 s for the pulse to travel the...
  2. A

    Pulse Jet engine - A new design concept

    I`ve had a new idea in designing a pulse jet by adding a valve in it... According to my intuition and logically this increases the output many folds and I`ve given sufficient reasons for suggesting it. I have a powerpoint of my idea that I have made and I request any of you to please go through...
  3. F

    Bipolar transistors and pulse amplification

    hello i have been having trouble working with bipolar transistor. i have been taking pulses that at less then 1us long and amplifying them with transistors. how ever if i have a bipolar transistor as part of my amplifier whether it is my inputs are as part of another stage the pulses always are...
  4. J

    Mathematical description of the valveless pulse jet

    Well I want to understand the internal working off the valveless pulse jet, I have red something but everything is qualitative, I would like to ask to you if you know some book describing every process off this kind of engines mathly, including the kadenacy effect. You have a lot of physics...
  5. N

    Pulse Width of a Magnetic Field

    Hello, new kid on the block here. I have read the rules and hereby present my question. My aim is to calculate the period of a transient DC magnetic field from a half sine wave magnetiser output into an air core wirewound coil. Coil Resistance : 14.66 mili ohms (derived using voltage drop...
  6. P

    Circuit Diagram: Pulse Generator W/Varying Width/Amplitude/Freq

    help me out with circuit diagram of pulse generator with varying pulse width,amplitude and frequency
  7. S

    High frequency pulse generator

    Hi, I'm trying to build a high frequency generator. The pulse needs to have atleast 1ns rise/fall time, variable amplitude (~0-8V), 50 Ohm output impedance, and have very little jitter/be stable and I need to be able to set the pulse width and delay from ~5-1000ns. Cheers, Steve
  8. G

    Determining the Dimensions of a Pulse Jet Engine: A Scientific Approach

    If you were to design a pulse jet engine where would you start? How do you determine the diameter and length of the tail pipe? How do you determine the diameter and length of the combustion chamber? How do you determine the area of the air intake valve system? How do you determine...
  9. Chandra214

    Generate 1ns Pulse w/Frequency 680MHz | Prathap Chandra

    Please suggest a method to generate a 1ns pulse. with 680MHz frequency. i.e ton: 1ns. the pin should also be able to generate pulses with pulse width anything from 1ns to 4s with 1ns step, i.e the pulse can take any value b/n 1 ns and 4s with 1ns step. This pulse is used to trigger a laser...
  10. G

    How Can I Calculate Pulse Jet Engine Dimensions Using Air as Oxidizer?

    Does anyone know any Forumulas or how to calculate the dimensions of a pulse jet engine? I have already built several PULSE JET engines that run by scaling up an existing hobby engine to a larger size. Problem is the scaled up models run but maybe they could run better. I can not find any...
  11. H

    What is the field strength of a pulse in an air core coil?

    I'm new to the forum, so hello! How can i calculate the magnetic field strength of the pulse of an air core coil, the number of turns is 20 & the height of the coil is 20mm, not single or multi layered just random wound. The pulse is 10V & 1Amp, the Inductance is 200uH. Not sure how to go...
  12. T

    Fourier transform of rectangular pulse (Waves)

    Homework Statement F(w) is the Fourier transform of f(t). Write down the equation for F(w) in terms of f(t). A rectangular pulse has height H and total length t0 in time. Show that as a function of w, the amplitude density is propertional to sinc(wt0/2). Homework Equations F(w) =...
  13. T

    Wave Pulse Picture Analysis

    http://i662.photobucket.com/albums/uu347/TwinGemini14/showme3.gif The top picture to the right is the picture of the rope before the wave pulse arrives, and the bottom picture to the right is a picture of the rope after the wave pulse has arrived. Notice that the rope has to stretch in...
  14. S

    How Do Wave Pulses Behave at the Junction of Heavy and Light Springs?

    Homework Statement Two springs are connected, one is a heavy spring and the other is a light spring. A pulse is traveling down spring A, towards a junction with spring B. Which of the following statements are correct/incorrect. A. If spring A is the heavy spring then the transmitted pulse...
  15. O

    Gaussian pulse equation in Laser?

    I want to use a pulse current instead of continuous current in the Laser rate equation as input. What would be the equation for the Gaussian expression when I'll swap the continuous current with pulsed current in my equation and implement it in Matlab? please let me know the ans if u have any
  16. K

    Pulse laser and spectral width help

    A pulse 300ns long is made using a continuous wave laser and a very(very) fast shutter. What is (approx.) the minimum spectral width of the pulse? I have no idea where to start. For starters what is the spectral width? and how would i go about solving this problem. Not looking for a...
  17. S

    Creating a Pulse Width Modulator Circuit

    We have been asked to make any circuit of our choice using op-amps on a breadboard or a PCB. We have found this circuit of PULSE WIDTH MODULATOR on the net and we have decided to go for it.But our teacher wants us to explain the designing of the circuit too namely why have we used the resiistors...
  18. madmike159

    Finding the Right VCR/VDR or VCO to Make a Variable Length Pulse

    I need to make a pulse of varing length. Either I need a VCR/VDR to control the length of a momo stable pules, or a VCO to trigger a preset monostable at different times. I have been trying to find some thing to do the job for me but havn't had any luck. The VCR2N/4N/7N made by Siliconix are...
  19. T

    Travel Time of a Wave Pulse Through Two Steel Wires

    A steel wire of length 5.0m and radius 0.300 mm is knotted to another steel wire of length 5.0m and radius 0.10 mm. The ires are strethed with a tension of 150 N. How long does a transverse wave pulse take to travel the distance of 10 m from the beginning of the first wire to the end of the...
  20. A

    Guitar String Pulse: Time & Reflection Calculation

    Homework Statement The wave speed in a guitar string is 265 m/s. The length of the string is 63 cm. You pluck the center of the string by pulling it up and letting go. Pulses move in both directions and are reflected off the ends of the string. a) How long does it take for the pulse to...
  21. H

    Energy conservation for a relativistic doppler shifted pulse

    I am new to the field of relativity. I read the Lorentz transformation between different system of coordinates. I have a question. Let's suppose that we have a Doppler shifted pulse in frequency (time dilation). This pulse has the same amplitude as the pulse seen by a moving observer. That is...
  22. D

    What happens to gravity when light travels at the speed of light?

    (Offtopic from another thread) So I have a super-duper laser which can emit a very short but extremely powerful pulse in some direction. This pulse is so powerful that the energy of light is say 1Kg * c**2, or the relativistic mass of light is 1Kg. What is a gravity from that light...
  23. J

    Correct method of measuring a pulse

    I am currently working a project to evaluate the power output of a single pulse through an air core transformer. Using a scope to measure the secondary output and I am confused on what voltage to use. Scope shows DC voltage, peak voltage, drop Voltage differntial of peak and drop voltage. Would...
  24. R

    Laser Scanning: Wavelengths & Pulse Durations

    Detailed ideas on how different wavelengths and pulse durations can limit scans
  25. 9

    Calculating Mass on a Wave Pulse Along a Wire

    Homework Statement The figure shows two masses hanging from a steel wire. The mass of the wire is 60.0 g. A wave pulse travels along the wire from point 1 to point 2 in 24.0 ms. What is mass m? Homework Equations The Attempt at a Solution L=8.0m m_{string}=60g=0.06kg...
  26. N

    How many particles have momentum in a specific interval?

    Homework Statement a pulse 1 m long contains 1000 α particles.at t=0,each α particles in the state ψ(x,0){1/10e^(-ik_0 ) lxl≤50cm,k_0=π/50 and 0 for elsewhere,} at t=0 ,how many particle s have momentume in the interval 0<hk<hk_0? Homework Equations introduction to quantum...
  27. S

    Can Lasers Ignite Fuel/Air Mixture?

    Is it possible to detonate or to ignite a fuel and air mixture using lasers, or a laser pulse, any type of laser, CO2 or other wise ? or is there any possible way of using Lasers for the propulsion of an aircraft, i am already aware of several methods, but they do not include ignite fuel, any...
  28. T

    Time constant and pulse magnets

    Greetings I've been reading about these magnets such as these: http://www.lanl.gov/orgs/mpa/nhmfl/magnets.shtml Take a look at the pulse durations (it says in notes at the bottom "Total pulse length including decay" It's all nice but I don't understand one thing. How can they make...
  29. jacksonpeeble

    Build an Electromagnetic Pulse Generator

    I also posted this under Computer Science incorrectly... I am curious if anybody knows how to build an Electromagnetic Pulse Generator (aka EMP). I've looked for a guide online, but all of the ones I've seen are far too advanced and/or powerful for my purposes. I'm looking for about a 5'...
  30. S

    Time Evolution of a Square Pulse - Fourier

    Hi There, A square pulse of light has the form f(x) = A exp(ik0x) for |x| < L/2 and f(x) = 0 everywhere else. I want to know how that pulse evolves overtime. I want to graph it in Mathematica. I did a Fourier transform to find the wave number spectrum, with the general form: F(k) =...
  31. C

    NMR Q: Why an RF pulse can rotate Mz so fast

    Learning about Nuclear Magnetic Resonance for a while. I have read than when the main field B0 is applied along the Z axis, it takes a time (T1) in the order of seconds for the M0 field to be created in the body we are studying. Yet we can apply a short (maybe in the order of one wave...
  32. V

    What is Clock Pulse in Digital Circuits?

    wat is meant by the clock pulse given to the flip flops in digital circuits. Is it just a supply that is given to the ic as long as it is held in on position. How do some chips operate when the clock goes from high to low and not when pulses go from low to high?.
  33. F

    Can a Pulse Be Shorter Than One Wavelength?

    Take a laser source with small bandwidth centered around the average frequency (or wavelength) With an hypothetical external modulator that can switch as fast as we want, ca we make a pulse that is spatially shorter than 1 wavelength? If not? Why? What would that entail? Clearly the number...
  34. S

    Unit Pulse Response for a discrete time system

    Homework Statement Compute the unit-pulse response h[n] for n= 0,1,2,3 for the following discrete time system: y[n+2] + 1/2y[n+1] + 1/4y[n] = x[n=1] - x[n] Homework Equations I think i am supposed to replace the functions of x with delta functions, which are zero at all except n=0...
  35. J

    Average Value for pulse waveform

    Heres the graph... http://img205.imageshack.us/img205/4770/graphfc6.jpg" Im trying to find the Average value for a pulse waveform... the formula is Vavg = baseline + (duty cycle) (amplitude) How do I treat the amplitude since it varies...Do I treat the cuty cycle differently as...
  36. O

    Exponential Fourier Series for Pulse Train

    Homework Statement I need help finding the exponential Fourier series for the pulse train below. http://img329.imageshack.us/img329/1184/20080427091409ev5.jpg Homework Equations p_T(t)=\sum_{n=-\infty}^{\infty}{D_n e^{j2nt} D_n=\frac{1}{T_0}\int_{T_0}^{}{x(t)e^{-j2nt}dt}The Attempt at a...
  37. G

    Exploring the Difference Between a Current Pulse & DC Circuit

    A current pulse exists, in which the current jumps from 0A to 10A, stays at 10A for 200 microseconds, then drops from 10A to 0A. What makes a current pulse different from the current that runs when a switch in a DC circuit is left closed for 200 microseconds...is it the same concept?
  38. C

    Power consumption of pulse coils

    I'm trying to optimize pulse coils and determine power consumption. According to Ohm's law: P = V2/R where P=power / V=voltage / R=resistance Why isn't Ohm's law providing the same results as actual meter testing?? Testing coils with 1 "C" battery: 1.5 volts #1) 2.3 ohm coil...
  39. J

    Light pulse measurement with photodiodes

    I am trying to measure very high light pulses by using photodiodes. Light levels are expected to be upwards of 2-3W of irradiance. Pulse-widths are from 20uSec to 1mSec. Example light source is a highly over-driven high brightness LED, typically 200-300mW in power (during recommended current...
  40. F

    RL and CR circuit pulse train response

    i'm having a LOT of trouble understanding pulse train response in RL and CR circuits... could someone please recommend a good reading over the internet... i understand LR and RC response fairly better... and use the snapshot idea to get voltage equations etc... but its very confusing and i...
  41. L

    Convert Pulse to DC Voltage - Ideas Needed

    Hey, I need to find a way to convert a pulse that can be in any amplitude from 0 to 5v and output DC voltage at the same amplitude. any ideas? :) Liad.
  42. S

    Multipath dispersion of a pulse of light in an optical fiber.

    Homework Statement Multipath dispersion of a pulse of light in an optical fiber. How is this problem solved?
  43. A

    How Do Tension and Distance Affect Pulse Travel Time in a Stretched Cord?

    Homework Statement a cord of mass 0.65 Kg is stretched between two supports 28 m apart, The tension of the cord is 150 N, how long will it take a pulse to go from one end to the other? Homework Equations ok, so I really know is: speed of wave=frequency*wavelength... The Attempt at a...
  44. B

    How to pulse electric a current

    How to "pulse" electric a current I'm looking for a way, or component, that will pulse an electrical current through a circuit, and I'm not sure where to start looking. I'm looking to hook a 9v battery to a small simple circuit and send the current through that circuit in pulses. For example...
  45. G

    Is the direction of a pulse from a laser pen dependent on the observer?

    Suppose I am in an inertial non-accelerated reference frame, and I observe a laser pen moving in a direction perpendicular to its length at a uniform constant velocity of one meter per second. If the laser pen were to fire very briefly, say for 1 millisecond, while in this state of uniform...
  46. C

    Looking for someone who knows pulse induction/metal detection theory

    Hi there I'm looking for anyone who has the knowledge or experience that can help me develop a pulse induction gold metal detector. I have the fabrication resources but need someone who understand metal detection/circuit board technology. Please Email with experience.
  47. E

    Electric pulse attenuation

    Hallo to all, I have been reading a paper regarding electric pulse attenuation and the values are quoted in dB. The conversion to dB was done by multiplying the value with (20log10e) where "e" is the base of the natural logarithm. I see this conversion to dB fist time. I can not find any...
  48. B

    Wave Pulse Reflection and Transmission in Spring Junctions

    Homework Statement Two springs are connected, one is a heavy spring and the other is a light spring. A pulse is traveling down spring A, towards a junction with spring B. Which of the following statements are correct/incorrect. A. If spring A is the heavy spring then the transmitted pulse...
  49. J

    E+M fields for a localized pulse

    Hello, I am having trouble finding solutions for a localized electromagnetic pulse in 3-D. Ideally, I'd like the fields to be zero outside of a region centered on the pulse, but a gaussian wavepacket is fine with me as well. Let's have the pulse travel in the z direction, the plane wave...
  50. M

    Calculate Laser Pulse Intensity (Optics)

    A laser pulse has a duration of 50 fs (50E-15 s) and an energy of 1 mJ. The laser is focused to an area of 50 micrometers square. What is the peak intensity and peak electric field at the focus? I previously tried to do this problem with normal intensity equations using intensity =...
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