Generation Definition and 363 Threads

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. JJBladester

    Rate of entropy generation (can it be negative?)

    Homework Statement The Clausius inequality combined with the defintion of entropy yields an inequality known as the increase of entropy principal, expressed as Sgen ≥ 0 where Sgen is the entropy generated during a process. Homework Equations Sgen ≥ 0 The Attempt at a Solution...
  2. S

    Power generation using buoyancy, gravity and compressed air

    Hi all, this is my first post. I was wondering if it would be possible to use a deflatable/inflatable bladder inside a housing with an air valve at the top and bottom of said bladder secured through the housing. The housing material would be heavy, placticised metal or stainless steel. This...
  3. J

    Distributed/decentrallized power generation vs. Regional power generation

    Hello everyone! Need help with understanding the terms "distributed/decentralized" vs. "regional power generation". 1. Is there any difference between the terms "distributed" and "decentralized" generation (of electricity)? I thought "distributed" means generation of electricity on units...
  4. I

    Why does the frequency on a power grid increase when generation exceeds load?

    I could rephrase the same question, why does the frequency decrease when load exceeds generation? I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...
  5. A

    Why people are still discussing the 4th generation models?

    3 generation is required for anomaly cancellation, then the 4th generation seems redundant. But there are still papers about the 4th generation, what is the reason? Thanks
  6. H

    Coal-steam electricity generation

    Homework Statement A coal-fired steam power plant operates on the ideal Rankine cycle. Feedwater from the condenser at P1 = 10 kPa is pumped to the boiler at P2 = P3 = 20 MPa, where it is superheated and exits the boiler at T3 = 550 °C. The moisture content in the turbine is...
  7. R

    Does RPM affect electricity generation?

    Let's say I have a magnet inside a coil of wire. If I spin the magnet for a 10 second period, twice, the second time spinning it significantly faster, will more current be induced during the second period? And would this apply to generators in wind turbines, etc.? Thanks.
  8. A

    Concept/design generation for a system to pull light things up

    Hello Physics Forum, I am a second year student and with a team of 4 and instructed to design an auto belay for rock climbing. The main functions it has are: descending, braking and switching from a stopped position to descending. We've come up with a few designs/concepts for descending...
  9. K

    Factoring Fuel generation is nuclear energy still a viable solution

    Hi all I saw the posting below in regards to nuclear not being all that its cracked up to be. This is from a scientist in europe. I am intersted in rebuttals. I am pro nuke and just entering the industry but I do not have the experience to shoot this down. Fishing for comments Post...
  10. O

    Wind Power Generation Comparison

    Homework Statement Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas the second site the wind blows at 10m/s for 2000 hours per year. Assuming wind velocity is negligible at other times for simplicity...
  11. R

    Piezo electricity generation using piezoelectric disk(buzzer).

    I am going to use piezoelectric disks to generate energy from pedestrial movement on footpath please help me which circuit i have to prefer for my project?
  12. S

    Variable-capacitance power generation

    A few days ago I read the phrase "variable-capacitance power generation." I tried to find more information, but nothing turned up. Is anyone here familiar with it?
  13. E

    Excess Energy in Optical Generation

    When light is absorbed by a semiconductor, it will only lead to generation of EHPs if the light has energy greater than or equal to the bandgap. Now, all the sources I've been able to find online say that any excess energy in this process (ie, E>Eg) is simply reabsorbed into the lattice as the...
  14. S

    Quantum and classical noise for random number generation

    The gold standard for generating random numbers is the quantum effect of nuclear decay -- particles and photons being emitted from the atomic nucleus -- and unless you are one of those Hidden Variables types this is really random. The silver standard is thermal noise. There is a nice article in...
  15. P

    Surface generation from constant depth planar contours

    Hi all, I am trying to develop an application that converts a parallel set of input contours(polygons) with constant Z values to a tessellated surface mesh .The contours may also consist of holes All available tessellation techniques like glu,delaunay talk about 2d triangulations only...
  16. A

    Stability of Unstable Particles at High Energies: Third Generation

    Are particles that are not stable (for example top, bottom quarks; W and Z) when produced in particle colliders possibly stable at very high energies? Are third generation particles stable at high energies? Thanks, Mark
  17. D

    Flux Pinning/Heat Generation in Type II Superconductors

    I don't understand the mechanism by which "flux tubes" create heat, and are pinned by impurities in a type II superconductor. When Bc1<B<Bc2 I understand magnetic flux will penetrate the material in the form of flux tubes. Then the current in the superconductor exerts a force on these tubes...
  18. H

    Free Electricity Generation (A serious question over a funny picture)

    [PLAIN]https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc7/313028_10150383340891940_666206939_8328916_99129355_n.jpg Would this system work, if the air-water isolation problem (water leakage into the air tank) is solved? If it would work, where does the input energy comes from? We obtain...
  19. D

    Power generation with peizoelectricity

    I read an article that using peizoelectricity , ideas to generate energy from public movements was tried. How far was it sucess? If this is possible , can we generate energy from vehicles movement on roads?
  20. P

    Stellar Energy Generation and Nucleosynthesis

    Introduction: The evolution of stellar objects is inherently caused by the chemical composition of the star. Internally, thermonuclear reactions leading to the formation of complex atoms lead to a change in chemical composition which in turn will affect the evolutionary position of a star...
  21. S

    Energy Generation Coefficient in a 50 Solar mass Main Sequence star

    Homework Statement Calculate the energy generation coefficient ε (J s^-s kg^-1) in the center of a 50 Solar mass Main Sequence star, assuming that all luminosity is generated in a constant density core containing one tenth of the total mass of the star. Homework Equations L=M^3.3...
  22. A

    Haber process and power generation

    Is the Haber process ever used to generate electricity? I recognize that it's not an efficient means, because of the amount of energy needed to create H2 gas, but because the actual Haber process is exothermic and is less efficient once the temperature creeps above 400 degrees, why shouldn't it...
  23. M

    Suggstion required for setup of a 3MW Power Generation Unit.

    Hello everyone, I represent an iron & steel manufacturing industry which runs on electricity. Currently our electricity consumption is 1,000,000 units/month @ 5.5 INR/Unit consumed along with maximum kVA reached during the time of manufacturing of product which is affecting the costing of...
  24. B

    Second Harmonic Generation: Light Intensity & Efficiency

    OK so i know it is possible to double the frequency of a light beam by using second harmonic generation by passing the beam through a non-linear crystal; however i am unclear as to the required intensity of light beam that is needed to achieve efficient conversation. Would it be possible to...
  25. V

    Conceptual question: THz generation in ZnTe

    When a broadband 800nm sub-ps pulse propagates through ZnTe parallel to the {110} plane it produces in-phase THz radiation by moving the electrons down either the [-111] or [1-11] axis. Due to the electronegativity of Zn and Te the electric field of the optical pulse will push electrons...
  26. E

    Scientific Method and Spontaenous Generation (Microbiolog)

    Homework Statement Scientific Method - Set procedures / steps to investigating a thought / observation Spontaneous Generation - Living things came about by non-living things Homework Equations Define the importance of the scientific method with respect to the theory of spontaneous...
  27. T

    What Code Can Predict Neutron and Gamma Yields from an AmBe Source?

    Hello, does anyone know of a code that will generate the expected neutron spectrum for an AmBe neutron source along with the expected reaction efficiency?
  28. B

    Can we identify the generation of any star?

    Hi all, I would love if someone could clarify these five questions for me: 1. Is it correctly understood that all stars are of a certain generation? 2. Which generation is the sun? 3. What is the highest generation star we know of? 4. In the Milky Way, what is the share of first...
  29. H

    Population Estimates Over 2000 Years: My Questions

    From this day , if we take in account . How much population will be my following generation at the end of 2000 years(from this day). My question is , will the population be thousands or millions? Will it likely be fade away in the middle and no trace remains in the end? Any...
  30. A

    Solving Second-Harmonic Generation Phase Mismatch - Exact Solution?

    Hi All, I was searching in the net if the exact solution of the nonlinear system describing the second harmonic generation does exist, but I found nothing. Does some one know about such solution and if yes can you give references? Thanks
  31. P

    Random Number Generation - What is the 'middle one of three'?

    Homework Statement The logistic random variable X has CDF: F(X) = exp(a + bx)/(a + exp(a + bx)), b>0 (i) Obtain a formula for random values of X in terms of R ~ U(0,1) (ii) Using the cdf, suppose that a certain application requires you to generate 'the middle one of three' i.i.d...
  32. Loren Booda

    Can Next Generation Telescopes See More than Just a Dime in San Francisco?

    What novel objects do you anticipate we will observe among the very first galaxies? Among the first stars?
  33. P

    Random Number Generation Question

    Homework Statement Consider the following probability table: X 1 2 3 4 P(X) 0.4 0.25 0.25 0.1 Use the rejection method to generate a random number. Use the following list of random numbers: 0.6072, 0.4893, 0.0899, 0.3456, 0.4419...
  34. M

    Calculating Natural Gas Requirements for a 1000MW Power Plant

    Homework Statement a gas fired turbine generator for producing electricity has an efficiency of about 50%. how many cubic feet would be needed to produce 1000MW for one year. Homework Equations 2.4 x 10 ^8 SCF/day is the natural gas required for the power plant input = 2.4x10^11...
  35. S

    Courses PG course in energy generation

    I am from India.I am currently doing my graduation in mechanical engineering.One thing that has attracted me a lot is energy production.I want to know if there are any PG courses specific to energy production any where.
  36. D

    Hyper-Rayleigh Scattering vs. Second Harmonic Generation

    I've been reading a bit recently on Second Harmonic Generation and came across a supposedly separate technique called Hyper-Rayleigh Scattering (HRS). Can anyone explain the difference? I came across this paper, but didn't understand the difference...
  37. R

    Heat conduction through a slab with internal heat generation

    Homework Statement There's a slab of a material with temperature T1 on the left and the T2 on the right. The thickness of the material is l with area A. In the centre, there is heat generation Qvol in the centre, which is a thin rod. Find the heat transfer Q through the material. Homework...
  38. C

    Power generation through building damping systems

    Hello, first time posting. If this is in the wrong forum, please move it to the correct one. (its a cross mechanical/structural/civil/electrical engineering idea) I was thinking on the way home Power generation. In order to generate power, wave motion can be used (such as tidal/wave power...
  39. S

    Wine Fermentation Heat Generation

    I am working on an HVAC system for a winery. Part of the heat loading during the peak late summer/fall season will be from the fermentation process and I am having difficulty finding information on the amount of heat generated from fermentation of wine. Exposed wine surface area of each tank...
  40. M

    Exploring Electricity Generation From Turnstile Gears

    ELECTRICITY GENERATION THROUGH THE CONVERSION OF ENERGY PRODUCED BY REVOLVING GEARS OF A TURNSTILE As the title implies, do you think it's feasible? I'm working on it as a topic on my research subject, but I'm having a hard time. I didn't know that there are lots of principles involved...
  41. E

    Could second and third generation SM particles NOT be fundamental?

    could second and third generation SM particles NOT be fundamental? since they are unstable and rapidly decay, could second and third generation SM particles NOT be fundamental? perhaps as bound states of more fundamental first generation particles? if they are not fundamental, then do we...
  42. I

    Correlated multivariable gaussian random number generation

    \mathrm{prob} \propto \mathrm{e}^{-\frac{(a -x_1)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_1 -x_2)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_2 -x_3)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_3 -b)^2}{2 \sigma^2}} a and b are known real constants. Is there a way to generate x_1, x_2, x_3 independently...
  43. Borek

    Can Girls Excel in Chemistry Too?

  44. B

    Group generation and normal subgroups

    There is a step in some book which is vaguely explained, I just want to check whether my working is correct. Let G be a group, and let x be in G-{1}. Let Y be the set \left\{g^{-1}xg : g\in G\right\} . I want to show <Y> is normal in G. Now it's clear why Y is invariant under conjugation (Y...
  45. X

    Comparing Power Generation Potentials of Hydrogen and Xenon

    Generally the working fluids in a power generating system is either water (steam) or air. This I imagine is because they are widely available fluids. The specific heats of these ranging from some 1 - 2 kJ/kg-K. For the sake of argument, let's assume that hydrogen or xenon are equally...
  46. N

    Laser Physics: Second Harmonic Generation

    Hi I was told that I2ω is proportional to Iω2. It does not say so in my book. How is it one can easily see that it is the case? Niles.
  47. D

    Heat Generation in a circuit due to moving charges

    1. Homework Statement A capacitor of capacitance C id charged by a battery of emf E and inernal resistance r, A resistance 2r is also connected in series with the capacitor. The amount of heat liberated inside the battery by the time capacitor is 50% charged is? Answer is E2/C 2...
  48. J

    Is it Ethical to Condemn Unborn Generations to a Life on a Generation Ship?

    With our present level of knowledge the only possible way for humans to leave the Solar system would be “Generation Ships”, large relatively slow spaceships that would take several generations to reach their destination. Even if such ships could be constructed, is it morally acceptable to...
  49. S

    Maximizing Savings with Solar and Wind Power Generation

    Greetings, I'm seeing programs that allow solar, wind and other types of power generation to be connected to your house (or business) and you are still connected to your grid. The power company meters both - what they provide to you and what your private generation provides. Your power...
  50. H

    Power Generation from Constant Rotating Mass

    An object with a mass M is rotating around an axis, with an arm of radius R at a certain speed V. Assuming that the movement is constant, and a 100% efficiency, how many watt of electrical power can this device generate ? For example purpose, we can take M=60 kg, R=5 meters and V=10 meters per...
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