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.

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  1. Q

    The Einstein-Hapgood Papers, Crustal Shift

    From: http://www.lauralee.com/rflemath/e-h.htm I know people have used this theory to explain myths of ancient civilizations and dinosaurs in the Lock Ness etc... However, when we strip away the automatic reactions to the ideas exchanged between Dr. Einstein and Mr. Hapgood and look at the...
  2. D

    Understanding Phase Shift Upon Reflection: A Closer Look at Fresnel's Equations

    Let's say I have light at normal incidence. Under what circumstances is there a phase shift? Under what circumstances is there no phase shift? My best guess is that there is normally a phase shift of 180 degrees. The exception is when n_incident > n_reflected, but I don't really know. To...
  3. G

    1D infinite potential well with origin shift

    Hi guys, I am solving the 1D infinite potential well for a particle, but in this case instead of the potential being 0 from -a to a, its shifted to 0 to 2a. I have calculated that the even parity solution is zero. My question is, I have calculated that k=n*Pi/(2*a) by applying the boundary...
  4. J

    Red shift occurs when gravity is at 90*

    Pardon me if i am not grasping something. but! Tell me if this very short presentation does not give a good argument that red shift occurs between two stationary light sources where gravity is at 90 degrees. http://creativefamily.net/science/Lecture0601.pps This lecture is from a...
  5. W

    Can red shift compare which clock go faster?

    Hi, We often say, an observer near the horizon of a BH finds the light traveling from far outside the horizon blue shifted, or an observer away from the BH finds the red shift of light from near the horizon. We get a conclusion that a clock near the horizon goes faster than a clocker far...
  6. A

    If speed of light is constant, how does prismatic color shift occur?

    If differing wavelengths explain color variations, would not the longer "zig-zags" of the separate colors for the bluer spectrum portions of visible light suggest that they have traveled longer to get to a discrete point from that of their origin? - Assuming that the component colors of...
  7. N

    Can a galaxy have a recession velocity greater than the speed of light?

    Hi all. I was reading: http://www.astro.ucla.edu/~wright/doppler.htm but I'm failing to understand this part: My understanding is that a galaxy cannot move faster than c (the speed of light). Why then could a galaxy moving close to c have a recession velocity greater than the speed of light...
  8. D

    Interpreting Interference Pattern Shift in Double Slit Experiment

    Here's the question, A double slit experiment uses a helium-neon laser with a wvaelength of 633nm and a slit separation of 0.120 mm. When a thin sheet of plastic is placed in front of one of the slits, the interference pattern shifts by 5.50 fringes. When the experiment is repeated under...
  9. K

    Understanding Burstein-Moss Shift

    i have searched it online but i can't find any material describing this effect. >.< what is it about?:confused: thanks for answering:smile: kit
  10. J

    What is the appropriateness of the term potential in general relativity?

    What is the highest known blue shift?
  11. P

    Distance and Red Shift of stars

    Are there any tables for the distance against red shift of stars. I've heard that for stars close enough so you can measure the distance by triangulation it is correlated but not as strongly as the "almost perfect correlation" that I have been taught.
  12. A

    Gravitational red shift question

    Why does the frequency of a photon emitted from the surface of a star decrease as it moves away from the star? if hf`=hf(1-GM/(R*c^2) then as the distance becomes larger, R becomes larger, so f`becomes smaller?
  13. S

    Gluon Colour Shift: Research Project Idea

    I had a thought the other day - following from general relativity, a photon experiences a gravitational red shift in frequency. Searching for a research project, I toyed with the idea of a chromodynamic red shift if a photon were to pass through a strong field. However, since the photon has no...
  14. J

    Scattering theory - phase shift - best approx.

    Hi all, we're looking at scattering theory in the QM course right now, and I've got a question concerning the approximative ways of calculating the phase shift \delta_l of the partial waves in the partial wave expansion of the scattered wave. One way (the semi-classical) to calculate it is...
  15. wolram

    Quasars non cosmological red shift.

    http://arxiv.org/PS_cache/astro-ph/pdf/0506/0506115.pdf Title: On quasar host galaxies as tests of non-cosmological redshifts Authors: E. Zackrisson Comments: 9 pages, 4 figures Journal-ref: MNRAS 359 (2005), 1193 Despite a general consensus in the astronomical community that all...
  16. wolram

    What is the significance of high redshift black holes for the early universe?

    http://arxiv.org/PS_cache/astro-ph/pdf/0506/0506040.pdf Title: Rapid growth of high redshift black holes Authors: Marta Volonteri, Martin J. Rees Comments: Submitted to ApJ letters. AASTeX format. 11 pages, 1 colour figure We discuss a model for the early assembly of supermassive black...
  17. L

    Measure in grover's alg and shift phase

    hi , i am new here so at first i want to say hello to all of You. as title says i have two questions about qrover's algorithm, first one is more general i guess: 1. in the most of articles i have read about this algorithm the measure wasn't well explained,problem is that authors wrote "now we...
  18. Pengwuino

    Calculating Compton Shift of X-Ray at 300KeV, 37°

    I have a problem saying: X-rays having an anergy of 300KeV undergo Compton scattering from a target. The scattered rays are detected at 37 degrees relative to the incident rays. Find the (a) Compton shift at this angle. Now i have the angle.. but i figure i need the wavelength of the...
  19. E

    Exploring the Lamb Shift and its Impact on Electron Mass within Atoms

    Lamb shift proved that within an atom the energy level of electrons changes with changes in orbital position. Given that energy and mass are related (or “one and the same” according to some texts) does this mean that within an atom electron mass varies? And if so does this not contradict...
  20. Link

    How to calculate relative doppler shift

    I am to measure the rotational velocity of Io relative to Jupiter, and will do so using a spectrograph. I will measure the frequency change of a specific mineral emmision band in the spectra, and then check how much it has shifted from its original wavelenght with a table. Then I use the...
  21. wolram

    Discover the Latest Baryonic Mass Figures from the Galaxy Red Shift Survey

    The latest figures for baryonic mass etc.
  22. C

    What is the significance of a fringe shift in Fizeau's experiment?

    I'm working on a modification of Fizeau's experiment in 1851 about the addition of velocities. I've derived the formula for the fringe shift. But the problem is I actually don't know what it is. I know it's the movement of the interference pattern. But it has no unite, so what is the meaning of...
  23. M

    Geometric field / Thirring Lense / Red shift

    General Relativity is assuming the existence of a metric everywhere, in someway depending directly or not on the repartition of the energy. Must I understand this assumption as equivalent to the existence of a background geometric field ? The satellite Gravity Probe B is actually testing the...
  24. D

    How Does the Doppler Shift Affect Light When Approaching a Source?

    do you get a doppler shift when your moving towards a light source? like, i know light gets redshifted with expanding space and gravity, but if light always approaches you at the same speed, how would frequency change there?
  25. O

    Sky Shade Shift: Does Color Change at Latitudes & Altitudes?

    I'm not sure which sub-forums this should go in... Does the shade of blue that the sky appears to be change at all at differing lattitudes on Earth? What about different altitudes? If so, how much? Any links to specific info? Thanks for any input you have.
  26. S

    Doppler effect distinguish whether the red/blue shift

    when observing heavenly objects, there is an important role of doppler effect. but is there a way to distinguish whether the red/blue shift is because of translational, rotational motion or perhaps thermal motion of the atoms?
  27. kat

    News Typically Dem voting populace: seismic shift

    This is BIG IMHO Analysis: 'Seismic' Catholic shift to Bush *snip*
  28. wolram

    Exploring Red Shift Quanta: H. Arp's Controversial Theory

    http://www.setterfield.org/Redshift.htm This paper may be controversial, It discuses red shift quanta, i notice reference is given to H Arp, but i leave the reader to form an opinion.
  29. R

    Relativistic doppler shift

    For the relativistic doppler shift: change in wavelength = (c - Vs) To / (1 - Vs ^2 /c^2)^1/2 where Vs is emitter velocity, c is speed of light and To is time. Suppose change in wavelength was equal to just 1 / (1 - Vs ^2 / c^2)^1/2 then (c - Vs) To = 1 c -Vs = 1 / To c = Vs + 1...
  30. U

    Questions about Light: Exploring Red/Blue Shift

    I had some questions about light. Mb some1 could explain 2 me. I know about red shift and blue shift. If the object is moving towards you it's color shifts to blue and vice versa. Is this because if the object is moving towards you it compresses the light waves and if moving away it...
  31. K

    Lamb shift and creation of mass

    A 2s electron in a hydrogen atom has more energy than a 2p electron. Quantum field theory says this is because the 2s electron interacts with itself by emitting and absorbing a photon.But what if the proton and the electron carry a charge which is always repulsive.Then a 2s electron which is...
  32. L

    Cosmological Red Shift: What Is It & How Does It Relate to Gravity?

    What is the cosmological red shift? I've seen it before and couldn't figure out what exactly it was. All I know is that it has something to do with the effects of gravity and how it relates to photon frequency.
  33. J

    Unraveling the Red Shift Dilemma: Exploring Alternative Explanations

    HELP red shift dilemna is it at all possible that the apparent red shift of distant stellar light sources is not actually as a result of expansion?? For example, the whole distance is a mess of gravity wells that could cause red-shift, as well as the emitting characteristics of Hydrogen which...
  34. N

    Red Shift caused by space itself ?

    "Red Shift" caused by space itself ?? Perhaps the distant objects are not receding at all. If "space" is not empty, but rather is a complex structure, probably containing energy which can be released (wouldn't we just love to know how), then as light "waves" - I prefer to call them...
  35. P

    Achieving Variable Phase Shift in Yellow Light

    I would like to cause a phase shift in light. I would prefer to do so by varying the voltage to the phase shift device. Is there any existing system or any suggestions? We had a bit of difficulty with this one. I dropped a few decimal points or something. Lets try this one more time. I...
  36. 0

    Using Shift Instructions with 8-bit Microprocessors

    most 8-bit microproc. don't contain a * or / can some offer some help on how i can use a shift instruction to do this
  37. F

    Doppler Shift Equation: How to Calculate Frequency of a Stationary Train

    A train moving toward a detector at 31m/s blows a 305-Hz horn. What frequency is detected by a statiory train? Using the equation f´= f(V + Vd/ V - Vs) The answer is supposed to be 340-Hz but I don't understand how to get it. Mind helping me out?
  38. O

    Can Pure Math Experience a Paradigm Shift Without Experimental Validation?

    Hi, A Paradigm Shift happens in physics mostly when fundamental concepts of some system are deeply changed by a new theory and/or new experimental results that supporting and/or triggering a new theory for enough long time. Pure Mathematics has no experimental side like physics, therefore...
  39. I

    What is FOR ? doppler shift?

    What is "FOR"? doppler shift? What is "FOR"? I believe it an acronym having to do with the doppler shift? :confused:
  40. C

    Photon Doppler Shift: Exploring the Theory

    Photon Doppler Shift? I am a practicing EE who has used the standard Doppler shift equation for thirty years in radar design; therefore, I am not disputing the correctness of the equation but the "explanation" that is so often given in textbooks. The general explanation always discusses...
  41. Z

    (red shift) & (tired light) claim

    Question #1; Here are a few points on this topic. The proposal is many years old. I want to comment on the 4th point A thought experiment: Suppose 2 photons of identical energy and momentum (wavelength & momentum?) leave a distant source and utimately get individually detected by our...
  42. H

    Phase shift in the Michelson-Morley experiment

    The Michelson-Morley experiment is supposed to be able to detect a time difference between the paths of light in a parallel and in a perpendicular path to the aether wind, both two-way paths of the same length. It is argued that, if such time difference exists, it will be revealed as a phase...
  43. G

    Exploring the Relativistic Doppler Shift

    relativistic doppler shift I'm trying to show that this equation for the doppler shift for light: f' = [&radic;(1+(v/c))/&radic;(1-(v/c))] * f reduces to &Delta;f/f = -v/c for v<<c So I expanded (1+v/c)^(1/2) = 1 + v/(2c) and (1-v/c)^(1/2) = 1 - v/(2c) dropping higher order terms on the...
  44. wolram

    Redshift Jumps: New Evidence of Quantization?

    http://www.setterfield.org/Redshift.htm Further data came in supporting z quantisation, but the astronomical community could not generally accept the data because the prevailing interpretation of z was that it represented universal expansion, and it would be difficult to find a reason for...
  45. R

    Mobility Shift Assays: Links & Resources

    I am looking for some good links on this particular methodology. Anybody have any?
  46. S

    Doppler Shift: Deriving a Formula for Both Moving Objects

    My book derives two formulas for Doppler shift. One for when the source moves and one for when the observer moves. What about when both are moving? I tried deriving it myself... but I couldn't :( If you want, you could just give me a hint on how to derive it.
  47. C

    What is the Doppler shift equation for light?

    i've been having a tough time trying to solve the following problem. A pulsating star has a period of 3 sec as seen from the rest mass frame of the star. What is the period of the star as measured by an observer traveling 2.2e8 m/s with respect to the star? I assumed that it was simply...
  48. A

    What Causes Blue and Red Shift in Light?

    what exactly is the blue and red shift? what happens? why does this happens?
  49. T

    Red shift frequency from a black hole

    Can someone tell me if these statements are right/wrong, and if wrong, why they are wrong? Lets say you have a light (or more generally, EM) source a distance r from a black hole's core, with r > event horizon radius. As you move closer towards the black hole, since the energy of a...
  50. D

    Ultrastable Optical Clock with Neutral Atoms in an Engineered Light Shift Trap

    Does someone can explain that? The transition frequency v of atoms exposed to the lattice electric field of E is described as, hv = hv^(0)-(1/4) alpha(e,w)E^2-(1/64) gama(e,w)E^4 where v^(0) is the transition frequency between the unperturbed atomic states, alpha(e,w) and gama(e,w) are...
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