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.
Train problem
Homework Statement
005 (part 1 of 1) 10 points
A 23-car train standing on the siding is started
in motion by the train's engine. There are
4 cm of slack between cars. The cars are 9 m
long. The engine is tightly connected to the
first car and moves at a constant speed of...
Hello All,
I'm looking for a nifty chip that I can use to pro grammatically set the pulse width of a square wave signal in my circuit. The pulse width range I'm looking for is anywhere between 10 ns and 500 ns and so far, the only thing I have found is the DS1014 series ICs. They have the...
Hi everyone:smile:,
This is my question:
" Describe the concepts of PCM (Pulse Code Modulation) in a computer keyboard which its data are in digital format."
This is my justification:
How to describe the concepts of PCM ? Isn't PCM a technique used to transmit analog signals in digital...
I am a student in a DMS program. Our instructor poised the following question (worth extra credit!) if we can answer it and back it up.
OPERATING FREQUENCY IN PULSED WAVE TRANSDUCERS IS DETERMINED BY:
A. FREQUENCY OF THE VOLTAGE
B. PULSE REPITITION FREQUENCY
C. THE MEDIUM ONLY
D. THE THICKNESS...
Hello All,
I have been doing some experiments where I need to make a very short pulse to switch on and off a MOSFET I am using (IRF840) but all I have as a pulse source is a small function generator which outputs square waves fixed at 50% duty cycle.
So I had an idea to use a simple high...
i was reading about pulse jets and ram jets as part of my course on jet propulsion. all i was told was that they are aero-thermo-dynamic-ducts.
couldn't understand what they mean. checked google, but the articles i got were vague.
could someone explain what aero-thermo-dynamic-ducts are?
Homework Statement
2. The attempt at a solution
i thought it was number one...as we have -4.5m/s in the equation indicating that the pulse is moving in the negative direction.. i submitted the answer.unfortunately it was incorrect..
Can you help me with this..if possible.
Homework Statement
Submarine is traveling at 12 m/s toward an aircraft carrier emits a 2400 Hz sonar pulse. The reflected pulse returns with a frequency 2310 Hz.
What is the speed of the aircraft carrier?
(Positive/negative means the carrier is moving toward/away from the submarine.) The...
Hi, I have this problem to do for HW. I did what it asked for, or so I think. I think I may have made a mistake somewhere, it's telling me its not correct. Can you check it out?
BTW, I have to use the step by step approach. I'm assuming my solution will be v(t) = K1 + K2 * e^(-t/RC).
I then...
Hello
I currerntly have this circuit -
https://www.physicsforums.com/attachment.php?attachmentid=8419&stc=1&d=1164497449
circuit1.jpg
I am trying to keep it as simple as possible. I have scoured loads of site etc, an have even found the circuit I want, or should I say it is described as the...
Question Details:
The figure shows two rectangular wave pulses
traveling toward each other on a stretched string.
Each pulse is traveling with a speed of 1.00 mm/s,
and has the height and width shown in the figure.
If the leading edges of the pulses are 8.00 mm
apart at t = 0, sketch the shape...
1) One end of a rope is tied to a stationary support at the top of a
vertical mine shaft 80.0 m deep. The rope is stretched taut by a box of mineral samples with a mass of 20.0 kg attached at the lower end. The mass of the rope is 4.00 kg. The geologist at the bottom of the mine shaft signals a...
I was reading about what would happen if an Anti-Matter star and Matter star collided. What I read says the collision would make enough gamma rays to sterilize and entire eighth of a galaxy of life.
Yet, I thought about something, when the two collide, their surfaces would touch first. (Duh) So...
Here is the problem:
If a pebbel is tossed into a pond, a circular wave pulse propagates outward from the disturbance. If you look closely you will see a fine structure in the pulse consisting of surface ripples moving inward though the circular disturbance. Explain this effect in terms of...
This is not homework please do not move it to the homework section.
I need a pulse generator for an experiment I want to conduct at home... but I don't have that kind of money so I am trying to design and build one.
I am trying to see if the type of pulse generator I need is even feasible...
Hi,
Im trying to calculate the power of a pulse. I know the duration of the pulse t in seconds and I know the peak current Ipeak in Amps. If need be I can also calculate the resistance R of the conductor. I know of P=RI^2 but am not sure if this holds for pulses.
Help/Tips/Suggestions...
Finally, after several delays on the DVD, PULSE has ust come out on DVD...A few days Ago I went to get it, tonight I got around to watching it...but the first disk is more scratched that anything I've ever seen, and disk 2 has some pretty bad scratches aswell...so now I have 2 DVDs that don't...
Hi,
I need some help/ideas/direction... I need to build a pulse generator that is capable of generating a peak current between 100A~1000A that lasts for about 0.5ns and can be ready to pulse again in 0.5ns so the frequency of operation is around 1Ghz
Help!
Thanks
Instead of shooting a single burst of beam, use multiple shots ( say 1000 per second or more ) Theoritically each laser beams should punch a hole through the air, each one traveling further and each one creating a vacuum within its path. The high powered lasers that auto industries use have...
Sir,
1)Is it true that y = a sin(wt) is the equation of a wave pulse and y = a sin(wt – kx) is the equation of a progressive wave?
I think it is true.
2)Will the following 2 waves produce stationary waves?
y1 = a cos(kx – wt)
y2 = a sin(kx + wt)
I think the answer is No. What do...
I was debating on another forum about EM Pulse (yes, I just watched War of the World :tongue2: ).
Anyway, does anyone know exactly what electrical components will be damaged by an EMP?
I know silicon chips would be dead, but what about capactors, diodes, resistors, etc.
Also, if a cars...
One of the funniest oneliners I've seen in a technical paper:
" It is therefore impossible to have a Laser deliver more than about a GigaJoule of coherent light. The implied limitations to military systems, such as those inspired by SDI, are so tragic they shouldn’t even be contemplated. "...
In another thread I murmured something about asymmetric climate problems at the end of the last ice age. Here, I’ll show three studies that form a big conflict together around a sudden sea level rise that is known as “Melt Water Pulse 1A”. Curiously enough one person, Prof Clark of the Oregon...
The electron densities, ne, at any height h < 300 km on the lower side of an F2 layer can be described by a scale height relationship:
n_{e}(h) = n_{e}(300) \exp\left(\frac{0.75(h-300)}{H_{O}}\right)
where HO is the neutral atomic oxygen scale height. If the ionosphere has an isothermal...
I have tried this problem many times using different equations and none of them have worked how do I solve this?
A cord of mass 0.51 kg is stretched between two supports 26 m apart. If the tension in the cord is 148 N, how long will it take a pulse to travel from one support to the other?
Doppler Radar??
Please can someone help me with doppler radar...need to know bandwidth?? Is it usually continuous wave or pulse?? or can it be both??
pretty much just after some general knowledge on doppler radar?
thanks in advance!
Hi,
a. A free-running, flashlamp-pumped Nd:YAG laser produced pulses having a duration of 500 microseconds at a repetition frequency of l00Hz. Deduce the pulse power in this type of operation if the average power of the laser is 5W. (100W)
b. This laser is then Q-switched and the average...
Hi, I am coming into my senior design project and I have a question. Originally, my group was going to design a new cylinder head design without using poppet valves. Being that we only have 15 weeks, we figure we don't have nearly enough time. Wanting to keep an automotive related project, I...
I'm trying to design a simple circuit that will enable a magnet passing by an induction coil to send an IR pulse to a simple receiver plugged into a Linux box. This will be used to measure the speed of a turning wheel without having to worry about batteries or a power block of any sort. Any...
Hi, I am wondering if anyone here has a way to calculate the surface temperature of an object as it gets hit by a radiation (laser) pulse of known power and duration, (and wavelength...). Thanks.
We currenlty have a circuit that takes a pulse from a 555 chip and goes through two divide by ten 7490 switchs to create a binary counter that counts up to ten. We are trying to figure out how to convert this binary which we have displayed in regular leds into a 7 segment LED - (LN514rk)
any...
Hey dearest people
Who can help me solve the following problem?
A wave pulse is described by,
y = 0.04exp(-0.6(68x - 7600t)2) [m].
Here t is measured in seconds, x and y are measured in meters.
a) What is the velocity of this wave pulse? Be careful to get the sign of the
velocity...
Can anyone help me attempt such a project?
I basically need to be able to sense the injection pulse in the injector pipe (1/4 inch / 6mm dia.) and convert it to an electrical pulse so that a normal ignition timing light (strobe light) can read the input as it would on a petrol/spark ignition...
Can anyone tell me where i might find plans for a valve less
pulse jet engine, with a thrust of about 80 to 100lbs, i want
to use it to power a novel gocart. i want to use gas as the
fuel if possible.
I can't figure out how to find the mass of the clothesline, even though given the density, because the radius or crossectional area is not given. Any input on this would be appreciated.
A clothesline of length 10m is stretched between a house and a tree. The clothesline is under a tension of...
A nylon rope of length 80 ft. is under a tension of 3000 lb. The total weight of this rope is 6 lb. If a wave pulse starts at one end of this rope, how long does it take to reach the other end?
Hello, I have a question concerning electromagnet coils and static electricity. If one were to generate a static charge and store it up some how (like in a Leyden jar or something), and that charge was then dumped over a small electromagnet, would there be enough energy to provide a small...
why we should use the pulse function in function generator when we need to check the speed of electromagnetic wave in coaxial line ??
why we can't use the other like sawtooth function??
I would like to ask why a radio-wave pulse with defined frequency was used in NMR, why it can excited different proton in sample measured.
Is it related to so-called "lifetime boarding" ??
Thx :frown: