What is Generation: Definition and 362 Discussions

A generation is "all of the people born and living at about the same time, regarded collectively." It can also be described as, "the average period, generally considered to be about 20–⁠30 years, during which children are born and grow up, become adults, and begin to have children." In kinship terminology, it is a structural term designating the parent-child relationship. It is known as biogenesis, reproduction, or procreation in the biological sciences.
Generation is also often used synonymously with cohort in social science; under this formulation it means "people within a delineated population who experience the same significant events within a given period of time". Generations in this sense of birth cohort, also known as "social generations", are widely used in popular culture, and have been the basis for sociological analysis. Serious analysis of generations began in the nineteenth century, emerging from an increasing awareness of the possibility of permanent social change and the idea of youthful rebellion against the established social order. Some analysts believe that a generation is one of the fundamental social categories in a society, while others view its importance as being overshadowed by other factors including class, gender, race, and education, among others.

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  1. caters

    What types of illness would be allowed on a generation ship and why?

    With 44000 people for genetic diversity reasons, it is inevitable that some will be ill. Now the types of illness allowed would differ. Take viruses for instance. A cold virus like this rhinovirus: Would be no big deal. It would just cause a cold. Ebola on the other hand would be a huge deal...
  2. Alfredo

    Pelton Wheel for Power Generation

    I am a simple Newbie, wanting to make power, using Pelton wheel say 45 psi water pressure , 3/8 to 1/2 nozzle...is there a way to determine the results or is there a better psi/nozzle combo? Generator can be 12/24/48 volts
  3. K

    Sound Generation from Fluid Flow

    Hi guys, I am involved in some research on modelling sound from fluids through mirco annuli and i have been trying to get some of the basic fundamentals on generation of sounds from turbulent flow. Unfortunately most of the online literature do not give much details on the physics of such...
  4. JTC

    Windmills and Power Generation

    I tried yesterday with the gyro and did not make myself clear. So let me try with a windmill, please. I look at a windmill and I see the blades are spinning. Thus, the shaft axis has an angular velocity. I can ballpark and check the angular velocity with my eyes. I want a ballpark...
  5. R

    Plasma Generation using Dielectric Barrier Discharge

    I am having trouble in making a power source for the DBD. I can't seem to find any calculations to get the required voltage and frequency of AC to generate plasma. I want to know the circuit/method/equipment needed to generate that voltage from a normal 220 V/50 Hz AC socket in my lab.I am doing...
  6. P

    Where I can find the article: Higgs-Thomson-Fibonacci generation

    Higgs-Thomson-Fibonacci generation of lepton and quark masses By Gerald Rosen Drexel University, Philadelphia, Pennsylvania 19104 Hadronic Journal; Journal Volume: 19; Journal Issue: 1; : Feb 1996, pages 95-100 OSTI Identifier: 471531
  7. N

    US solar power generation for 2014-16

    Solar generation results for US are out for 2016. Year over year: http://www.eia.gov/electricity/annual/html/epa_01_02.html US: Net Generation (Thousand Megawatthours) 2014 Solar: 17691 (that's 0.43%) All sources: 4093606 https://www.eia.gov/electricity/annual/pdf/epa.pdf: US: Net Generation...
  8. DoobleD

    EM wave generation using a single charge in a vaccum?

    I wonder if it is possible to generate a propagating EM wave by making a single charge oscillate in vacuum ? In practice, when we create EM waves, we (always ?) have opposite charges oscillating, like with a dipole antenna : In the dipole antenna case, I can see how the fields detach...
  9. Aswin Sasikumar 1729

    The generation of sound when water drops fall on a liquid surface

    It will be very helpful if someone suggest any articles or reading materials on this topic for detailed study.
  10. W

    Acoustic Electricity Generation - Modern Applications

    I do apologize if this is considered against the general discussion rules. I'd really like to get the opinion of individuals of an intellectual nature. I remember a recent discussion with a few family members on the topic of building infrastructure (roads) that generates electricity utilizing...
  11. Leyzorek

    I Methods of Hawking radiation generation

    first question From what i read Hawking radiation is a particle and ant particle created on the event horizon of a black hole, one particle is pulled into the black hole letting the other escape, why does the one outside of the event horizon escape instead of both being pulled in? It would still...
  12. F

    Carry forward of Extra limbs across generation?

    If a human or animal is born with extra body parts such limbs, will it's offspring will also have that extra limb ? (Assuming both parents have that extra limb) If the answer is yes, then should it not be possible to create huge populations, perhaps entire countries with people having extra...
  13. B

    Function generation using Chebyshev polynomial

    In case of a four bar linkage if we have a function y=f(x) does it mean that we have to design a four bar linkage such that the input crank angle and the output rocker angle will satisfy the equation? Moreover after finding the precision points assuming linear relations wherever required how do...
  14. H

    Electric field generation between anode and cathode

    Hi I'm running an experiment where I want to see the electrical field generated when I energise a submerged anode (an array consisting of 4 x stainless steel tubes spaced equidistance apart) and cathode array (similar to the anode) upstream and downstream of the flowing water tank (glass sided...
  15. N

    Fuel Cells for Isolated Electric Generation

    Hello, I am researching about fuel cells that use Ethanol as a fuel, because I want to buy a equiptment of approximate 5 Kw (Electric) that uses Ethanol as a fuel for electric generation in anyplace, where yet there is not supply of electrical Energy by wire. Have you heard anything about this...
  16. Pushoam

    Do photons emitted by charged particles in a uniform loop get canceled out?

    A clump of charged particles moving in circular motion emits em radiation. But if I go on increasing no. of charged particles till the time the system becomes current in circular path, then since each particle is having same acceleration and velocity, the current will be uniform. So, now the...
  17. S

    I Why is the Voltage Induced in a Rotating Coil Sinusoidal?

    Sinusoidal wave form ? I am asking: We know that if a coil rotates in a transverse magnetic field a sinusoidal voltage is induced between its terminals. . My question now is: Why it is exactly sinusoidal in the shape and not any other wave shape?? .
  18. BillTre

    New Concept for Zero Emission Natural Gas Power Generation

    Science mag news article on a new electrical power plant being set-up by a start-up. It burns natural gas with pure oxygen and runs turbines with CO2. It makes water rather than using it and is in theory close to competitive economically. . Sounds good to me, but I'm no engineer.
  19. Ali Ahmad

    Steam generation thermodynamics

    a cylindrical tank with volume V a volume of water is inside the tank and the rest is air now if coal combustion is releasing heat into the tank Qin and when the gauge reads a certain pressure "P", the valve is opened which allows steam to exit the boiler what's the mass flow rate of the steam?
  20. asteeves_

    Solve Entropy Gen of Water-Ice Contact, 100J Transferred

    Homework Statement 5 kg of water at 60 degrees are put in contact with 1 kg of ice at 0 degrees and are thermally isolated from everything else. The latent heat of ice is 3.3x105 J/kg. What is the change of entropy of the universe when 100J of energy are transferred from the water to the ice...
  21. B

    I Generation number conservation

    Why is "generation number" or "family number" conserved among leptons, but not among quarks? Why does a positive kaon decay into an antimuon and a muon neutrino? Why doesn't it decay into an antimuon and an electron neutrino? The anti-strange (generation 2) flavor then becomes anti-muon flavor...
  22. T

    MCNP Delayed Neutron Fractions and Neutron Generation Time

    Hello, I've heard that MCNP outputs delayed neutron fractions (beta) and neutron generation times (Lambda). Any ideas as to where in the output file it writes these? I've coppied and pasted the Godiva reactor code and run it, but I can't seem to find it in there. Best Regards, -TP
  23. Conductivity

    Sodium concentration during action potential generation

    ' At the peak of the graph, Is the concentration of Na outside the cell is more than inside? because that must be to overcome the electrical force in the opposite direction but my book says that that inside the cell there are more Na than outside When is the concentration of Na+ greatest inside...
  24. P

    A few questions regarding power generation by steam

    I have a few questions. Let's assume that we have steam at 200 barA pressure and 400°C temperature. If the temperature fluctuates but remains above the saturation temperature (365.746°C), does that affect power generation and turbine performance badly? Do the pressure too will vary with the...
  25. hsdrop

    How to inspire the next generation of scientists

    I was watching Star Talk and the topic was women in science fields so I got thinking (which always means trouble) I would love to hear how either you inspired someone else or someone else that you have know has inspired you to become interested in the any field of science
  26. Boltar

    Entropy for Random Number Generation

    I want to generate very random numbers. There's a few approaches to this, such as the audio input from a de-tuned radio, hooking user input such as mouse movement and hashing the results over a period of time etc.. My idea was to get a cheap Geiger Counter and just leave it monitoring background...
  27. J

    Fresnel reflection coefficient for Second Harmonic Generation (SHG)

    Hello everyone, this is my first post so I don't know whether or not this is the right thread to be asking this question (if so I am sorry). I am currently working on my thesis where I am determining the thickness of a GaN crystal through second harmonic generation. However in a article...
  28. C

    B World made up of 2nd & 3rd Generation particles

    This is a common question asked but I can't find a good reference. Supposed the first generation particles (electron, quark up, down) vanish and we only had STABLE second generation particles composing of muon, strange and charm quarks that suddenly became stable (don't decay).. would they form...
  29. Noisy Rhysling

    Generation ships v. hibernation ships?

    I'm a fan of hibernation ships because the crew that is selected to go is the crew that lands on the new world. I have a tough time seeing a crew that is 222 generations removed from the original crew being ready to investigate and develop a new planet. However, I'm open to other views, so...
  30. R

    Railroad wheels and energy generation

    How much energy generation potential would one rolling wheel on a train produce if it was hooked up to a generator if the train is rolling with continual momentum at various speeds. What is the reasonable optimum velocity of the train to maximize energy generation? How would you figure this...
  31. Hons K Wyn

    Magnets and coils configuration for electricity generation

    My dad is working on a project where he intends to convert mechanical into electrical energy, and he was wondering if a particular magnet and coil configuration works for electricity generation. And if it does, how are the voltage and current calculated. Lets say: The coils have a diameter of...
  32. ChrisVer

    A (Event generation) What information do you get....

    What information do you get by reading that some sample production (like the W/Z for Powheg) is normalized to the NNLO cross sections?
  33. brainbaby

    Generation of video signal by photoconductive effect....

    The thing which I am not getting is the role of scanning in generation of video signal by photoconductive way...the optical image is focused over the photoconductive material ...which decrease the resistance of the material according to the brightness of the scene being casted over the...
  34. caters

    Writing: Input Wanted Can Humans Survive on a Generation Ship with Alien Protocols and Dinosaur Mates?

    In my most recent story, the aliens have built a generation ship for humans to travel on. These humans are traveling to a planet that has dinosaurs originally from Earth that survived as species. The planet itself is 200 light years away and the ship is traveling at .5 C. I have designed it so...
  35. Alisdair

    Generation of magnetic fields....

    Hi all! ObiWanKenoobi here... it's my first post. My question is on a few levels based on my rudimentary understanding of most things. 1. If you have a ball of molten metal which is tightly compressed to behave almost like a solid... HOW is a magnetic field generated if the ball rotates on an...
  36. C

    MHB Random Number Generation Avoiding Human Error in the Keyboard

    Hi All Im hoping I am in the right area to ask this?!? Im looking for someones help. Is there a standard methodology or known equation for generating a random alpha numeric serial or incremental, which does not allow two characters to be used in sequence to each other which are near each other...
  37. Q

    Function Generation, Expressing in closed forms

    Homework Statement Taking derivatives of generating functions is another useful operation. This is done termwise, that is, if F(x) = f0 + f1x + f2x2 + f3x3 + · · · , then F' (x) ::= f1 + 2f2x + 3f3x2 + · · · . For example, ##\frac{1}{(1-x)^2} = (\frac{1}{(1-x)})'= 1 + 2x + 3x^2 +· · · ##...
  38. Y

    Wind Turbine and Power Generation

    Working on a wind turbine for a class project and making an attempt to add a brake. The idea is that the turbine will generate power at a certain wind speed and if the wind speed is increased, we would slow the turbine with a mechanical brake. We're using a 10V low-torque motor and have created...
  39. L

    Voltage and Frequency Regulation (Grid, synchronous generation)

    Hi I was wondering if someone could help me understand and explain to me how one can control the frequency of the grid from help of the active power (frequency -> power angle -> active power) and how reactive power can be used to control the voltage level. My thoughts: Voltage Control: I don't...
  40. P

    Maximizing Lift Through Vortex Generation on Airplanes

    For an airplane, their are multiple types of lift, camber, angle of attack, pressure difference, and vortex lift. I understand that at the end of wings the low pressure at the top, and high pressure on the bottom causes their to be a vortex formed. My question is, how exactly do they use that...
  41. N

    Calculating electrical generation from tidal piston

    I have been kicking around an idea for a while about generating electricity from ocean tides. The traditional approach is to use the flow of water through a channel to turn a turbine, which essentially blocks the channel for sea life and water craft. It seems more practical to use the rise and...
  42. drew wood

    Can I turn hydrogen gas into electricity without purchasing a fuel cell?

    I would like to start experimenting with hydrogen as an electricity source, but I haven't been able to find any good resources for steps after the hydrogen generation. I've made some prototypes of small-scale hydrogen generation using electrolysis, so now I basically have two bags, one filled...
  43. C

    Brainstorming: Large scale piezoelectricity generation

    Hello all; Just thought I'd throw a brainstorming question to all you smart guys out there about a subject I know only from the youtube videos I've just come across. Large scale electricity generation from piezoelectricity. I'm aware that this technology is used mostly on a small scale...
  44. gloppypop

    Power Consumption and Entropy Generation

    Homework Statement [/B] 2-3-15 Homework Equations [/B] P = power. W = work. U = internal energy. S = entropy. t = time. Q = heat. T = temperature. F = force. d = distance. P = ΔW/Δt= ΔU/Δt ΔS = ΔQ/T dm/dt = ρ⋅dV/dt W = F ⋅ d ΔU = Q - W Where m is mass, V is volume, and ρ is the...
  45. A

    Entropy Generation Homework: 100kPa-500kPa, 300K-500K, 600K

    Homework Statement Air at 100 kPa, 300 K is to be delivered to a pipeline at 500 kPa, 500 K. The scheme involves reversible adiabatic compression of the air and then internally reversible isobaric heating. Assume that, heat is exchanged with a reservoir at 600 K. Determine the work and...
  46. O

    Help thermo entropy generation

    Homework Statement Atmospheric air at 300K and 100kPa is to be delivered to a line at 600K, 200kPa. Two possible schemes for doing this are suggested. The first scheme involves reversible adiabatic compression and then internally reversible isobaric heating. .The second scheme involves...
  47. M

    Steam generation for an experiment

    What would be the best, cheapest way to generate steam intended for introduction to a device for testing? I would use a standard American 110v three-prong outlet as a power source for the steam generator. All I really need is a steam source with an absolute pressure of 2 atm/202650 Pa/29.39...
  48. Dlhill13

    Next Generation of Nuclear Power Ideas -- Opinions?

    Recently, I have been looking into more effective methods of harnessing nuclear power and making an attempt to move away from conventional steam plants and the use of turbines, thus reducing heat losses, maintenance and construction costs, etc. That being said, my current concept uses a...
  49. S

    Where does entropy generation come from?

    Let's think about two thermal reservoirs. They are internally reversible. This means they don't have entropy generation(Sgen) right? Each reservoirs' entropy change is different; one is minus(-) and the other is plus(+). But total entropy change in the isolated system has plus value(entropy...
  50. J

    What is the role of fractals in procedural generation?

    I've been reading a lot about computer games like Dwarf Fortress (of which I am also a huge fan) and No Man's Sky which generate the bulk of their content automatically by generating it procedurally. It often seems that when the methods of procedural generation are discussed, fractals end up...
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