What is Shift: Definition and 653 Discussions

Shift work is an employment practice designed to make use of, or provide service across, all 24 hours of the clock each day of the week (often abbreviated as 24/7). The practice typically sees the day divided into shifts, set periods of time during which different groups of workers perform their duties. The term "shift work" includes both long-term night shifts and work schedules in which employees change or rotate shifts.In medicine and epidemiology, shift work is considered a risk factor for some health problems in some individuals, as disruption to circadian rhythms may increase the probability of developing cardiovascular disease, cognitive impairment, diabetes, and obesity, among other conditions.

View More On Wikipedia.org
Recent contents Top users
  1. Yolander

    B Is the Andromeda Galaxy Green Shifted and How is Red Shift Measured in Practice?

    I've always read that the proof of the expanding universe is the red shift in all observable stars/galaxies showing velocity away from Earth observation. I've also read that the Andromeda galaxy is on a collision course with our galaxy. Would'nt that mean the stars in Andromeda would be green...
  2. G

    Second Shift Theorem: Integral Explanation

    Homework Statement for the alternative form of second shift property (4.8) , why he integral of (e^-sp) g(p+a) dp isn't equal to integral of (e^-sp) g(t) dp ? why it will become L{ g(t+a) } ? Homework EquationsThe Attempt at a Solution
  3. Buckethead

    How Does Doppler Shift Affect Light From a Shuttle to a Mother Ship in Space?

    Imagine a mother ship traveling away from Earth at .5c and a shuttle takes off from the mother ship in the same direction of travel at .5c relative to the mother ship. The shuttle fires a blue laser (400nm) to a transparent screen mounted on top of the mother ship as it is traveling away. Due...
  4. T

    Confusion in Doppler shift equation?

    I'm just trying to build Doppler shift equation for Moving observer and stationary source. I have an problem in a step. I'm attaching a screen-shot please check it and tell me where to this step ( 1 - v/u)^-1 comes from ? Thanks in advance.
  5. R

    Fluorescence Spectroscopy and Stokes Shift

    This is a question on fluorescence spectroscopy so physics/chemistry. What causes a large Stokes shift in the spectra? I know what causes the shift in wavelength, i.e., a relaxation of vibrational states before de-excitation to the ground state, but what actually causes a (very) large Stokes...
  6. D

    Is it possible to shift between parallel universes?

    I am new here and I have a question. Is it possible to shift between Everett's parallel universes in the form of your consciousness?
  7. karush

    MHB N27.09 Derivative of tan and phase shift

    Find the function with the given derivative whose graph passes through point P. $$r'\left(\theta\right) =6+\sec^2 \left({\theta}\right), P\left(\frac{\pi}{4},0\right)$$ 6+sec^2(x) The phase shift appears to be 1 but not sure how to get that How do add another equation to desmos?
  8. T

    How does a Synchronous condenser shift the phase

    Hi, So when you over-excite the rotor of a synchronous motor, or under-excite the rotor of a synchronous generator, how is the flux actually changing the power factor of the armature to leading? (something to do with the magnitude of the armature reaction flux vector?) That is to ask: by what...
  9. Vannay

    EM wave reflection: phase shift off of conductor

    I know there is a pi phase shift when going from an area of lower index of refraction to higher. Is this phase shift still pi when going from a non-conducting dielectric with index of refraction n and reflection off a "good" conductor?
  10. wolram

    Can a galaxy at z=8.68 disprove the LCDM theory?

    We see from wikipidea that EGSY8p7 z=8.68 13.2 is only a fraction away from the time of the BIG EVENT how close will a galaxy be to disprove the LCDM.
  11. C

    Compton Scattering and Recoiling Electron Momentum

    Homework Statement X-rays with wavelength 55pm are scattered from a graphite target. Consider an x-ray which is scattered from a valence electron at an angle of 180 degrees (back towards the x-ray source). a. Is the wavelength of the X-ray greater or less than before the collision? b. What is...
  12. S

    Light waves with 0 amplitude due to extreme red shift?

    Is it theoretically/mathematically possible for light waves to be red-shifted so much that it's amplitude is equal to zero?
  13. L

    Reflected Light at 3D Angle: Shift in Polarization

    I've searched high and low for answers to this, and a friend of mine finally pointed me in the right direction. I decided to write a post about it so hopefully others who have the same question will find the answer more easily. When linearly polarized light is reflected at a 3D angle, the...
  14. 24forChromium

    Understanding Equilibrium Shift in the Haber Process (N2 + 3H2 ⇔ 2NH3)

    in the Haber process (N2 + 3H2 ⇔ 2NH3), if there are 2mol of N2, 3mol of H2 and 1mol of NH3, how do I know that the system is not in equilibrium and which direction will it shift?
  15. Geofleur

    Specialty shift and book skipping problem....

    My area of specialty has been geophysics for the last fifteen years, but I have been increasingly drawn toward mathematics, not the pure sort but the sort inspired by physics. Things like investigating the mathematical structure of physical theories and looking for connections between them...
  16. DeldotB

    Derivation of "arcsin" phase shift formula

    Homework Statement Good Day, On an oscilloscope, when two incoming signals are out of phase, in an XY setting, an ellipse appears on the oscilloscope screen. The phase shift between the two incoming signals can be found by the formula: sin^{-1}((Y_{max})/(Y_{int})) where Y max is the...
  17. A

    Is it possible to shift the fermi level?

    I know we can shift the fermi level by doping the material with other elements. In case of semiconductors doping with the pentavalent or trivalent will change the fermi level. But my question is ''can we shift the fermi level, without altering the position of valence band and conduction band?"...
  18. L

    Why does a 90° phase shift maximize induction motor torque?

    Capacitor-start induction motors use a capacitor in series with the start winding to create torque to start the motor. After the motor gets nearly up to full speed, a switch takes the capacitor out of the circuit. I understand the torque is caused by the phase shift created by having the...
  19. N

    Raman Shifts of Metals for PhD Students

    hello, I'm a Phd student my Phd subject is about surface enhanced spectroscopy (SERS). i need a reference for the Raman Shifts of metals (ex: Gold (colloid or film), titan tungesten..). Plz if anyone can help me. thank you in advance Nicolas
  20. J

    Why Is My Calculation of Doppler Shift Different from the Standard Formula?

    Good day to you all, I wanted to share a struggle with you all that I can't seem to get out of. It's about calculating, in the case of sound, the decrease or increase in frequency (thus increase or decrease in wavelength) when a sound source is respectively moving away or towards an observer...
  21. E

    Phase shift in frequency domain

    Hello, I'using Matlab to simulate phase shift in frequency domain (FD). I have got real and imaginary parts of the signal after FFT. I'd like to use phase shift in FD. This works: Y=fft(y); YY=Y.exp(-i*2*pi*nk/N*samples_delay); result=ifft(YY); But in my DSP I can't use the formula above and...
  22. ShayanJ

    How to know there is a frequency shift?

    This is a question that I've had for years but because astrophysics and cosmology are down in the list of my interests, I constantly forget and remember the question. My question is, how do we know there is shift(red or blue) in the spectrum of the light coming from a star? Because for...
  23. TharitTk

    Swinging fans & Doppler's shift

    Homework Statement http://postimage.org/][/PLAIN] free picture upload Homework EquationsThe Attempt at a Solution I consider that if the fan is swinging, the source of sound (fan) will have an speed that lead to doppler's shift. but i can't calculate for this. i think speed of source will be...
  24. blue_leaf77

    Quantum Which books discuss the Lamb shift correction in atomic energy levels?

    What will you suggest someone for books which provide discussion on the Lamb shift (QED correction) of atomic energy levels?
  25. A

    Derivation of Relativistic Doppler Shift: Step-by-Step Guide

    i need thee the derivation of relativistic doppler shift. i found its derivation in the book of Serway, but it is not in detail and step by step. in the book there is given that: can anyone give me the step after eq#1.13? how eq#1.13 converted in the form of eq#1.14?
  26. B

    Resonant Frequency shift of bimorph piezo structure

    Hi, folk~ I fabricated bimorph piezoelectric shear stress sensors. When air flow applied, there were resonant frequency shifts to left side (decreasing) and impedance decrement in resonant frequency as well . So even though I am suspecting that kinds of results as because of damping effect...
  27. E

    The Importance of Gravitational Frequency Shift in GPS Measurements

    I have been studying the "fallen" photon experiment, in which the frequency of a photon changes as it falls through a height H. f'=f_0(1+\frac{gH}{c^2}) It is often stated that this is a huge factor in the application of GPS. However, I do not understand why. I understand that the photon will...
  28. pastoreerrante

    Scalar triple product invariance under circular shift proof

    Homework Statement Prove that for any three vectors ##\hat a, \hat b ## and ## \hat c##, ##\hat a \cdot (\hat b \times \hat c)## = ##(\hat a \times \hat b) \cdot \hat c ## Homework Equations [/B] ## \hat i \cdot \hat i = \hat j \cdot \hat j = \hat k \cdot \hat k = (1)(1)\cos(0) = 1 ## ##...
  29. D

    MATLAB Matlab - calculate phase shift using fft

    hello, I have 3 signals in the form of sampled values. When I plot them using plot (t,vPa,t,vPb,t,vPc) where vPa, vPb, vPc contains the values and t contains the sampling istants I get this: when I calculate phase shift using fft I get phase angle = 0. I have tried using my own code ( which...
  30. S

    How can you show the CMB shift parameter?

    Dealing with CMB, people sometimes refer to the shift parameter; R = \sqrt{\frac{\Omega^0_m}{\Omega^0_k}}sinh(\sqrt{\Omega^0_k}\int^{z_{dec}}_{0}{\frac{dz}{E(z)}}) I know that it is related to the position of the first acoustic peak, however, the amount is around 1.7. What does this mean?! does...
  31. thrush

    Cosmological vs. Relativistic Doppler Shift

    Does anybody know a good read/primer that compares the observed cosmological redshift values to predictions made by the relativistic (gravitational) redshift? Thank you!
  32. jerromyjon

    Sound wave propagation and doppler shift wrt the medium

    In contemplation and research regarding another thread's question about the asymmetry of doppler shift wrt the medium, I find myself trying to imagine two people talking... or perhaps better yet matching pitch. In still air with both people facing each other at ten paces of course they would...
  33. ShayanJ

    Why Does Reflection Phase Shift Not Always Apply to Both Polarizations?

    Its always said that a reflected light ray acquires a phase shift equal to ## \pi ## if ## n_1 < n_2 ##. But considering the Fresnel coefficients, its revealed that its only for the s-polarization reflection coefficient that ## n_1 < n_2 ## causes the coefficient become negative. The...
  34. T

    Does Gravitational Lensing Cause Red Shift in Light?

    Does light get red shifted during lensing, when it passes by an object with great mass such as a galaxy or cluster? If so then what are the effects on measurements of the CMBR and most distant red shifted galaxies? If true then presumably some light would be red shifted more than others...
  35. L

    Calculating Chemical Shift: How do magnetic fields affect NMR frequencies?

    Homework Statement In an NMR spectrum a CH2 group has a peak centred at 9.81 ppm. What is the shift in Larmor frequency of the protons from that of an unshielded proton if the spectrometer magnetic field is 9.4 T? The magnetogyric ratio of an unshielded proton is γH = 26.75 × 107 rad s-1T-1 2...
  36. C

    Calculation of phase shift from reflectance data

    Hi, do you know how i can calculate the phase shift of measured reflectance data? I find the dispersion relation formula but I can´t solve it. I know that this dispersion formula is split in three terms. The first term has a range form 0 to w_min, the second term from w_min to w_max and the...
  37. 2

    Deriving Gravitational Red Shift: Questions & Answers

    I am trying to derive the gravitational red shift effect but I think I am going about it all wrong. Specifically, I want to derive the change in frequency/ wavelength when a photon moves away from the surface of a star mass M and radius R. So I tried to use relativistic mass of the photon and I...
  38. 2

    Deriving the doppler shift equation for sound

    I am looking at derivations of the Doppler effect for sound and light, and I am very confused about what stays the same when it comes to sound. In this video, at 5:10, it is said that the wavelength will be the same. I'm not sure I agree with this because I'm pretty sure both the observed...
  39. D

    Exploring Doppler Shift: How Motion Affects Wave Frequency

    Hello to everyone! First I would like to go through one simple example: We have two bodies. One is wave source, other is wave receiver. In this example they are positioned like this: (source) O=====> (receiver) O=====> Distance between them is always 1000 m. Let's say that the waves are...
  40. Gary Boothe

    Red Shift Q: Where Does Lost Energy Go?

    I understand that because galaxies are receding from us due to the expanding universe, that we see a red shift in the light from these galaxies. If there is a red shift, the light loses energy, but where does this lost energy go? Is it that in the photon's reference frame there is no change in...
  41. G

    Doppler effect w/ percentage frequency shift?

    Homework Statement As you stand by a railroad track a train passes with its whistle blowing. As it passes, you hear a frequency shift equal to 21 % of the frequency of the whistle. How fast is the train moving. Express your answer in km/hr.(Speed of sound is 331.4 m/s) Homework Equations f’ = f...
  42. T

    Speed of Light & Red Shift: My Understanding

    My basic understanding is that no matter how you observe light, it always a constant, it always travels at the speed of light. So even traveling at near the speed of light you will always measure light traveling at the speed of light. If this is the case? Why do we observe red shift?
  43. M

    Understanding the physical meaning of phase shift in underdamped systems

    Hello all I know that the step response of a second order underdamped system is : y(t) = 1 – (e^(-ζωn*t) / sin(θ))*sin(ωd*t + θ) Where sin(θ)= sqrt(1-ζ^2) , ωd = sqrt(ωn^2 – ωn^2 * ζ^2 ) my question is: I can see on the simulation ωd and I can calculate it , but I want also to see the...
  44. S

    Calculating a matrix element & first order shift

    So I saw this a moment ago: How can the second and third terms yield (n+1)+(n-1)=2n and not (n+1)+n=2n+1? PS: I solved the problem by using [a,a(+)]=1. Sorry, this is very simple but I cannot figure out what I did wrong.
  45. Seydlitz

    Effect of different atom on Compton Shift?

    Hi guys long time no see, I'm having a small difficulty here in understanding the process. Looking at the equation and the derivation of it, it seems clear that the shift in wavelength can only be caused by the target mass. If we are talking about electron being hit by x-ray, then I take it...
  46. jerromyjon

    Exploring the Causes of Red Shift in Cosmology

    Does the expansion of space cause cosmological red-shift or does EM red-shift cause space to expand?
  47. K

    The physics behind the Dew Point phase shift

    Many websites gives the results of Dew Point but not the reason. What is going on at the dew point? Not the result (at a certain VSP vapour becomes liquid if it can find nuclei to coat) but the reason for the result. I have been reading up on this – just out of curiosity – and would like...
  48. B

    How to shift the function xe^x mathematically by one unit on the x axis?

    Hi Folks, I have a function x {e^{-x}} and if i shift it one unit to the right on the x-axis we have (x-1) {e^{-(x-1)}} How do I show this mathematically? Even consider the simple case of x^2, if we shift by 1 unit to the right it becomes (x-1)^2 What is the method mathematically? Regards
  49. V

    Doppler Shift of Light: Visible-to-UV Properties?

    If an observer and a visible light source are in relative motion such that the visible light source is blueshifted to ultraviolet frequencies, then would this visible-light-turned-ultraviolet-light being received by the observer have the same properties as that of actual ultraviolet light i.e...
  50. B

    Aharonov-Bohm Effect: Calculate fringe shift

    I am trying to figure out when electrons are subject to an Aharonov-Bohm apparatus (the pick up a phase of +/- e(magnetic_flux)/(h_bar), how the interference fringes are shifted. I know de Broglie wavelength is given by lambda = h/p and that the fringe spacing without the vector potential is...
Back
Top