Peak Definition and 253 Threads

I am working on theoretical laser amplifier model for a pulsed input beam. However, my model is based on a top hat pump beam and laser beam profile, I want to update to a super gaussian and gaussian distribution respectively. The parameters I know are: beam radius w Pulse Energy E and...

Homework Statement How many interference fringes are visible in the central diffraction peak if the ratio of slit separation to slit width is 3.125? Homework Equations d*sin(θ) = m*λ for interference maxima with slit separation d, maxima are at m = 0, 1, 2, 3 ... a*sin(θ) = m*λ for...

I am trying to program some motion control devices which have trapezoidal motion profiles to define a move. I can define the slewing(peak) velocity, accel/decel rates and distance to travel, the the hardware moves a motor the appropriate distance with the parameters given. I need to be able...

Homework Statement A kangaroo jumps a height of 2.8m. How long was it in the air? Homework Equations v=v0+at x=x0+v0t+(1/2)at^2 v^2=v0^2+2aΔx The Attempt at a Solution -2.8 = -4.9t^2 .57 = t^2 t = .76 s (down) 0 = v0^2+2(9.8)(2.8) 54.88 = v0^2 v0 = 7.408 0 = 7.408-9.8t t = .76 (up) t...

I attached the link to the problem. Shouldn't the Vlmax be 330V? I tried entering that and it wasn't accepting my answer.

Today in a lecture on chromatography the lecturer gave an explanation which seems pure ******** to me. The example she used was a handful of solutes, each taking a different path through the stationary phase, obviously some paths will be longer than others and thus each solute will have a...

Is there any truth to Peak Oil being a myth? Skeptics are claiming that oil is not made from previously living matter and therefore shouldn’t be considered a fossil fuel. They mention the deepest fossils ever discovered have been no more than 16,000 feet yet we drill for oil in depths much...

Greetings, I’m constructing a machine that involves a linear actuator powered by a 12vdc motor. My linear actuator has a foot that crushes an aluminum soda can until the motor’s torque maxes out and it stalls. The machine is intermittent duty at about 6 seconds of use every 3 minutes. My machine...

Hey guys, I've just got a couple of questions about this prelab I need to do for the Double Slit experiment. And just to make sure this is clear (I have no idea whether the method used in this experiment is normal) we have a double slit and a slit blocker. The slit blocker is after the...

What does it mean if one found negative absorption in uv-vis absorption graph?

General enquiries (template may not be suitable) - When the question provides value of AC voltage amplitude, is this the same value of peak voltage? - Also, in current waveform, when do we use peak current and rms current? - In ohm's law equations we use rms current, so in the current...

Is there any reason to expect both the star formation history and the angular diameter distance to peak at around the same value (redshift ~ 1.6)?

Hey guys! It seems that there are a few users here, so I will post the same question I posted over at chromforum.org: -------------------------------------------------- Hello All! :smile: I am quite new here and to GC in general, so I hope you can bear with me. I will try to keep this...

Homework Statement A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance of 5.00 cm from its unstretched position when the system is in equilibrium. If the spring constant is 43.2 N/m, determine the mass of the object. (answer in kg)...

Could someone explain what the 'first order' diffraction peak is?

Homework Statement Hi, Two given Voltages: U1(t)= 40V * cos(wt) U2(t)= 120V * sin(wt) wheres w means omega. Now I have to sum them up to U3= U1+U2 and calculate the peak value of U3. 2. The attempt at a solution My problem is, I'm not sure if the following is...

Homework Statement Imagine you have a magnet (Henceforth named MagX) which weighs .03lbs, and it is being continuously pushed by another magnet's polar likes (Henceforth named MagY) with a force of 3 PSI. Is it possible to find the peak velocity of MagX, assuming that MagY stays at a constant...

Homework Statement I have to develop an algorithm that can predict dominant peaks in the frequency domain, given a set of data in the time domain. I used FFT to check the frequency domain but apparently there are packet losses and irregular sampling intervals so FFT won't work. 2. The...

Homework Statement Determine the peak value of current of: \underline{I} = \frac{120\angle0^0}{10+j10} The Attempt at a Solution I change this into polar form and got: \underline{I} = 12.0 \angle -45^0 Therefore, the peak value of the current should be 12.0 A. However, the...

When we are considering the how much optical power a component/pin detector can withstand, are we more concerned about keeping an eye on the peak power or can we ignore the peak power so long as the average power is below some threshold value?

Excuse the obvious question. I feel like I should have picked this up somewhere along the way, but the more I think about it the more unsure I am. My question is: In a gamma spectrum, what determines the energy of an X-Ray peak. What causes it?

Homework Statement I have the task of finding the first peak (percussion peak) per each period of a ICP signal. I was told to filter the signal to get rid of some noise and a dc offset, find the percussion peak indicies and then plot those back onto the original signal. I am unable to only...

Homework Statement The open loop transfer function to a unity negative feedback system is given as: G(s)=50/s(s+10) Homework Equations Unity feedback is used in this problem, and the system input is a step function. Y(s)=50/s(s^2+10s+50) The Attempt at a Solution I have...

I'm trying to get a method to determine the time, t, when two sine waves added together peak, an exact solution. For instance, F(t) = sin(w1*t) + sin(w2*t) Obviously this is not really mathematically straightforward because there are infinitely many solution based on the nature of the sine...

Dear all, Searching proofs for Dark energy, people always mention "the first acoustic peak in CMB". can anyone tell me what exactly is that? how long did we expect it to be and now -having Dark energy- how long do we see it? can anyone help me please?

Homework Statement Peak envelope detector defined as A2MAX, which is the square of AM signal's envelope. AM radio transmitter rated for 4[kW] peak envelope power. Find max value of modulation index (mu) for tone modulation when average transmitted power (PT) is 1[kW]. Homework Equations -...

Note: This is not a homework or coursework, simply revision for an exam. Thanks Homework Statement [PLAIN]http://img194.imageshack.us/img194/223/question2z.jpg Homework Equations Peak voltage = RMS voltage x root2 r = T/(2RlC) T = 1/f The Attempt at a Solution part d)...

I need to calculate a number of things: 1. the torque of the wheels. 2. The peak power, i am assuming it means of the wheels 3. the work done. i know: total mass (car+wheel): 680kg. mass of wheel: 22.67kg there are 4 wheels. radius of each wheel = .203m time: 8s. acceleration: 26.82m/s^2...

I have a question about a magnets position over a coil of wire in an A.C generator. Is the voltage in the coil at Peak as long as its covered by the magnet? and then the voltage starts to decrease to 0 volts as the magnet starts uncovering the coil until the magnet totally uncovers the coil and...

Homework Statement A simple generator has a coil with dimensions 1.0 cm x 1.0 cm which is rotated at 60 Hz in 1.0 T magnetic field. How many windings (turns of wire) are needed to generate a peak emf of 120 Volts ? Homework Equations 1. emf E = - d (magnetic flux) / dt 2. magnetic flux = (B...

I have collected time-domain acceleration signals from the test rig through an accelerometer. Voltage signals are scaled to acceleration signals based on voltage sensitivity of accelerometer. Please refer the link given at the last to get the link for PDF attachment to see the time domain...

I am trying to figure out what the peak to peak of 2.00 cm diameter coil with 4000 turns at a frequency of 1000 Hz. However, I know that more turns will release more emf. Number of turns * Cross sectional Area of one coil = Number of turns * cross-sectional area of another coil. However, I am...

Herro guys, I'm trying to build a motor for shop class (from scratch really, new manifolds, ect :o), I'm only 15 so please take it easy on me :redface: Anyways, I've been trying to calculate my ideal runner length/diameter and stufflets for the intake manifold design. I've got a question...

LC circuit! Homework Statement A 550 microfarad capacitor is connected across a 1.35 H inductor. At a certain time, the charge on the capacitor is zero and the current is 0.362 A. How much later will the capacitor charge reach its peak? What's the total energy in the circuit? What is...

Ok, so say I have a system at a global temperature, I add an energy source (laser in this case) and it heats the system in a localized area. This leads to a maximum temperature peak in the system. Then you can get out a change in temperature from this maximum to the global. OK, now my...

First I try to find a way of finding area under Gaussian peak by using simple means. Questions at bottom of post. This concerns peaks with Gaussian distribution, eg. peaks in a chromatogram in some chemical analysis. The Gaussian distribution is f(x) = \frac{1}{\sigma...

Steve Mohr of Australia's Newcastle University has modeled the Earth's fossil fuel reserves and come up with this massive study (warning: 13mb). PROJECTION OF WORLD FOSSIL FUEL PRODUCTION WITH SUPPLY AND DEMAND INTERACTIONS...

Do you guys think we reached the peak of our evolution? Is there any higher advanced form we can evolve into as time passes, or are we really at our peak? Natural selection doesn't appear to take place for humans anymore, since the average human isn't being weeded out by some physical defect.

Hi there I have read that the area of a peak can be approximated by summing the recorded peak intensities. I can't see how this works? If you add all the peak intensities together is not just the magnitude of their sum and not the area of the surface the peak overlays? Someone told me that...

Homework Statement A hiker is at the base of a mountain and can get the horizantal distance between himself and the peak through GPS device:750 m. And suppose we know the actual measurements: It's a right triangle with an opposite= 750 tan (pi/6) = 433 m , an adjacent= 750 m, and a...

Hi. I am working on a circuit to control a dc motor using a pwm signal. The problem is that the pwm source (a LabJack UE9 DAQ) doesn't send a ttl signal, but a 0-3.5 volt signal (3.5 peak to peak). The power transistor needs about 5 volts to open completely between source and drain. A...

Hey guys, I am new here and had a question. I currently have a 1 V peak (2 Vpp) AC wave coming into my system and I want to find the most efficient way to convert it into DC. A simple bridge wouldn't work for me because too much of the voltage would be dropped across the diodes. The system...

I'm doing signal processing using MATLAB. But facing problem when doing Peak Detection. This is the signal that I used for the processing: This is what i wish to do: a) the horizontal line is the threshold point and b) the circle is the peak detection Can anyone help me...

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I am looking at sinusoidal motion (shaker tables) and am trying to calculate peak displacement given RMS acceleration. I can easily find the peak displacement using: a_{pk} = 4\pi^2f^2x_{pk} a_{rms} = 0.707a_{pk} as... x_{pk} = \frac{a_{rms}}{0.707\pi^2f^24} My...

Hey, For my first post here, I had a question about the gamma spectrum of Na-22. I measured the gamma spectrum of Na-22 with a Ge-spectrometer. Using Genie-2000 software I saw two peaks in the spectrum, 1274 keV (peaksurface 3981±1,74%) and 511 keV (peaksurface 25494±0,68%). (Horizontal...

Hi can somebody help me with part B of this question please? :) I already did part a) and I found the peak current to be 31.1 mA, and the power rating required to be 4.84 W. For part B I know the current for inductance is I=(1/L)\intVdt and I know V=V0sin(wt), however with only this...

This is an assignment I was told to solve ..the PDF file is attached..I already reached to the derivation of finding the ratios for the full wave recitifier.. Where I got to find that the gain is equal to = 1 . and that because of that R1 = R3..and R2 doesn't make a difference.. However I...

I have a curve defined by some points. These points represent the pixel brightness on the image sensor For example get these values: 5 14 60 111 100 37 Where is the brightness peak? Somewhere between pixel 4 and 5... ~4,3 Is there a method to determine this? Something with a name or...

Hello guys, I have a file with X Y values (separated by space) I want to scan the data to find the PEAK in the file. (It will probably be a lowest Y point...) How do I do this is Fortran? Thank you, Alexander