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.

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

    Calculating entropy generation of a process

    Lets say we have T1. From a reservoir 4000K, Q is added and that makes the temperature T2. How do we calculate the entropy generation in a process like that? Isn't it Sgen=S2 - S1 - (Q/T) But which temperature we will use in the (Q/T)? T1, T2 or 4000K?
  2. A

    Thermodynamics (Entropy Generation and Heat Engine)

    Homework Statement A hot gas stream at 600K and 200 kPa is cooled at constant pressure to 300K in a pipe by direct thermal contact with the atmosphere. The mass flow rate of the stream is 0,1 kg/s and the atmospheric temperature and pressure are 300K and 100 kPa. Modeling the gas as an ideal...
  3. Konte

    Nonlinear susceptibility in second harmonic generation

    I have read a book that demonstrate the origin of electrical susceptibility of high order in harmonic generation: (in Robert Boyd's book : "Nonlinear optics"). For example, he show clearly for the case of second harmonic generation, how \chi^{(2)} depends on matrix element of electric dipole...
  4. N

    Temperature distribution with heat generation

    hey i really need help with solving this question. 1. Homework Statement the problem is in one dimention x ( 2 plates with diffrent K joined together) for x=0 T=500 ( constat temp) 0<x<L - electric wire is generating heat that maintane the constant temp in x=0 ,it has K=40W/mK. L<x<2L - there...
  5. OmCheeto

    Can Humanity Overcome the Galactic Barrier in Star Trek's New Series?

    New TV(?) series premiering Jan 2017. [ref]
  6. J

    Thermodynamics -- total entropy generation during cooling of tank of water....

    Homework Statement A 0.2 m^3 steel container that has a mass of 30 kg is filled with liquid water. Initially both the steel tank and the water are at 50°C. Now heat is transferred, and the entire system (i.e., steel and water) cools to the surrounding air temperature of 25°C. Determine the...
  7. 0

    Man-made generation of water waves

    The only man-made water waves I can think of are artificial waves in specialized swimming pools. If the wavelength of the water wave is W, does the instrument generating these waves have to have dimensions on the same order as W? In other words, if you have a small object, can you generate...
  8. Legolaz

    Light and Heat Generation of Elements

    Hi forum, Is there anyway to quantify the proportions of light and heat energy generated from an element? I mean, is there a model which we can use to predict material energy conversion proportions when a voltage potential is applied to it.? Further, is the model able to predict material...
  9. C

    Heat generation of phosphor layer in white LED

    In a package of a phosphor converted white LED (blue LED + Yellow phosphor), two heat generation mechanisms exist. 1. Joule heating at junction temperature of blue LED 2. Heat generation of the yellow phosphor layer due to stokes shift and blue light absorption. Now I have questions. 1. Where...
  10. ChrisVer

    LHCb results show generation non-Universality (non-SM)

    This article suggests something was found and that today we will be able to find the paper online. http://www.eurekalert.org/pub_releases/2015-08/uom-ess082615.php I am eager to see what the found and at what significance...asking for extra experiments means that the significance they got was...
  11. Vinay080

    Newton's view on Line generation

    The following passage has been extracted from the John Stewart's English translated version of the "Sir Issac Newton's two Treatises: Of the Quadrature of Curves, and Analysis by equations of an infinite number of terms" http://archive.org/details/sirisaacNewtons00stewgoog: Here Newton...
  12. A

    Totally Hypothetical, probably incorrect, Shock Wave Generation Mechanism

    So I was sitting around pondering about forces, and I found myself thinking about shock-waves. Whether they're caused by supersonic travel, or explosions, the pressure at the front of the wave-bow shock pressure is a force. So I started thinking of a way to generate them without having to go...
  13. caters

    Money per person and 2nd generation

    In my base 10 math world there are rules for the gender of 1st generation numbers. They are: Primes alternate between 1 gender and another(specifically M and F) Composites have 3 more rules related to number of factors: M factors > F factors = M M factors < F factors = F M factors = F factors...
  14. R

    Harness Sea Wave Energy: Focus Waves w/ Diffraction & Floating Breakwaters

    Would it be possible to use diffraction to focus the enrgy of sea waves, on the principle of the zone plate (https://en.wikipedia.org/wiki/Zone_plate) but reduced to 2 dimensions? This could be done by an array of wave-opaque objects such as floating breakwaters, particularly along coasts...
  15. fricke

    Exploring the Work Behind EMF Generation

    I understand that EMF is generated by moving a closed loop of wire through a constant magnetic field. I am confused about one thing, who is actually doing work here? (of course it is not magnetic field).
  16. D

    Steam Generation Rate of a Heat Exchanger

    Let's say I have a shell and tube heat exchanger that is producing steam. I have a known volume of water entering the shell of the heat exchanger. Would the rate of steam generation be something like... rate of steam generation = (volume of water)*(density of steam)/(time it takes to deplete...
  17. ryanuser

    Piezo crystals and current generation

    hey can a piezo crystal generate current when it is hit as well as when it is exposed to sound?
  18. Jeffb47

    Gravity Electricity Generation?

    We've got a scalable sun tracker that requires no electricity. See << Link removed by Moderator >> Though invented for use as a less expensive alternative to the traditional electric motor solar trackers, we have come to realize that it can actually lift a lot of weight. We haven't tested the...
  19. Gunny

    Is there a portable CO2 generation system for off-grid use?

    Does anyone know of a portable CO2 generation system capable of producing between 100-150 CFM 24/7/365? This system will be used off grid, and needs to be powered by either biofuel or electricity. Thank you. <<Moderator note: Manual signature message removed.>>
  20. Eoraptor

    Angle determination of Sum-Frequency Generation in BBO

    Hi, 1. Homework Statement I have difficulties to get the correct angles for a third-order autocorrelator and I hope you can help me. In my setup are two BBO Crystalls, the first for SHG (Second-harmonic Generation) and the second for SFG (Sum-Frequency Generation). The Laser is a...
  21. Artlav

    Article on texture generation - can't get the math

    There is an article on procedural texture generation by example. I'm trying to implement it, and got lost in the mathematics. http://graphics.cs.kuleuven.be/publications/LVLD10PISTE/ The outline of the algorithm is thus: We start with a noise-like photo. Do a 2D DFT of it: Compute the power...
  22. DrVirz

    Thermodynamics - Entropy generation Q

    Hi all, Just doing some thermo study and am stuck on a question. I am not sure where to start this Q as normally I am given a property at the exit..? Any help is appreciated.
  23. R

    Mystery Generation of Dust Patterns from Grinding Wheels -- I can't explain it

    I'm not sure where to post this, but I wanted to show this just because of the incredible nature of the phenomenon. It's just the dust from a slow running wet grindstone. I assume just vibration, but the more carefully you look the more unbelievable it becomes. As the grindstone ran, some of...
  24. A

    About lightning spike generation

    Hello i am new user of in this forum... i am working on COMSOL Multiphysics for my master project i am working in the area of grounding so i have to analyze the material with lightning effect so i want to know how i can generate the lightning signal in COMSOL and how we apply to grounding rod
  25. y2j

    Control Flow Rate & Pressure of Boiler Steam Engine

    How can one control the flow rate and the pressure of the outlet steam from the Boiler of steam engine
  26. J

    What do you call Generation of electricity using waste heat

    What do you call Generation of electricity using waste heat from processes to make steam and drive generators
  27. R.C

    Power Generation (Optimization) in a Car Engine

    **Long Post** 1. Homework Statement The Mazda MX5 (2001-2005) comes with two engine sizes, 1.6 litre and 1.8 litre which are rated as 110 bhp and 146 bhp respectively at 6,500 rpm. You are required to choose one of the two engine sizes and analyse the system with a view to improving the power...
  28. S

    Sound Generation: From Soap Bubbles to Nukes

    A soap bubble or a nuclear detonation emit a sound created by the sudden release of pressured air? Am I correct? How is the sound of a knock on the door, two billiard balls hitting each other, etc. How is the sound generated in their cases? Thank you.
  29. eno31krad

    Random power generation thought

    Sorry didn't look too deep into it but had a random thought (and a couple drinks) ; would it be plausible to generate power by harnessing angular momentum from passing molecules? Perhaps hydro and wind generators could get an efficiency boost?
  30. P

    What is the Relationship Between Piezoelectric Materials and Electrical Output?

    hello! what is the maximum of electrism we can get from piezoelectric materials? can you give me some examples, or are there any tables, showing for each gram of piezoelectric material, applied a force of 1N, we get 1 ampere constant(?) current or something? thanks!
  31. D

    Second harmonic generation vs interference

    Hello, I have a question about the mathematical expression of interference and second harmonic generation If we have two waves ##E_{1,2}(\Theta ,t) = E_{1,2}e^{j(\omega t + \Theta)} = \frac{1}{2}(E_{1,2}e^{j(\omega t + \Theta)} + c.c. )## According to the Euler's formula. Now - both...
  32. Math Amateur

    Free Modules: Bland Corollary 2.2.4 - Issue on Finite Generation

    I am reading Paul E. Bland's book, "Rings and Their Modules". I am trying to understand Section 2.2 on free modules and need help with the proof of Corollary 2.2.4. Corollary 2.2.4 and its proof read as follows: In the second last paragraph of Bland's proof above we read: " ... ... If...
  33. Math Amateur

    MHB Free Modules: Solving Issue of Finite Generation Corollary 2.2.4

    I am reading Paul E. Bland's book, "Rings and Their Modules". I am trying to understand Section 2.2 on free modules and need help with the proof of Corollary 2.2.4. Corollary 2.2.4 and its proof read as follows: In the second last paragraph of Bland's proof above we read: " ... ... If...
  34. EinsteinKreuz

    Exploring Neutron Beam Generation via Compact Neutron Generators

    DISCLAIMER: This thread is a repost of another thread in the Nuclear/Particle Physics forum since I cannot delete that thread but this forum is more appropriate since it is more of a question in Nuclear Engineering than in Nuclear Physical theory. So I have been reading about the operational...
  35. S

    Exactly how do i control the fall of a falling object? (for power generation)

    Hi! So i have been having this discussion with a friend. we have an old shaft going down about 100meters and we want to tie a 100kg sand bag and use it to generate electricity as it falls. (we will simply pull it back up) if my understanding is right, then: i can either generate 980kw for 1...
  36. Adriane

    Allele frequencies of the next generation

    Homework Statement Starting with 75 light-colored beans and 25 dark-colored beans, the 100 beans represent my gene pool. Light beans = F and dark beans = f. p = (total F alleles) / (total number of beans used) And now I'm stuck where it's asking me to "practice determining the initial allele...
  37. P

    Thermomystery -entropy generation in a closed system

    My question relates to entropy generation in a closed system ΔS=dQrev/T for a reversible process ΔS=dQ/T + Sgen for an irreversible process This seems to suggest that Sgen arises because of the irreversibility of the heat transfer process (eg across a finite temperature difference). If...
  38. 1

    Cylinder with heat generation, Separation of variables

    I'm having some difficulty setting up a problem. I'm trying to model the temperature of a thermistor connected to a constant current source. The thermistor's resistance varies with temperature, so with a fixed current, I would expect to see the thermistor's temperature to oscillate with time...
  39. N

    Electricity Generation by piezoelectric effect in Injection Moulding

    Hello, Actually i want to make use of Clamping Force of Injection Moulding Toggle System to produce Electricity by making use of Piezoelectric effect. For example, if we place a quartz crystal (or any other piezoelectric material) on either side of the platen, then on each machine cycle, when...
  40. H

    Out of the water tidal power generation?

    Hello, I live in an area with large tides averaging 15 ft, twice daily. The city has a huge floating dock system in a large harbor held in place by fixed steel pilings. I have no idea what the weight is but it is a huge harbor housing a large fishing and personal use fleet. The docks are...
  41. B

    A generation is about one-third of a lifetime.

    Homework Statement A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD? Let me first say that this is my first time taking physics and this is all new to me so I appreciate all the help.Homework Equations here is the answer I...
  42. C

    Efficient Laser Steam Generation for High Pressure Vessels: Expert Suggestions

    I am working on a new concept design and would like some suggestions on which Lasers(s) would be most appropriate for heating a high pressure vessel for producing steam. The concept requires very quick steam generation but heat can not be excessive enough to harm the vessel being heated. As a...
  43. T

    Power generation through endothermic heat absorption.

    I have been toying with an idea that may break the second law of thermodynamics for a while now, but it is basically this; An endothermic reaction is used to convert heat energy into chemical energy, and then the products of that reaction are used as the reactants in an electrochemical reaction...
  44. K

    Entropy Generation in a Rod: Heat Transfer Considerations

    Hi.. Consider a rod which is insulated on its lateral surface, now this rod is brought in contact with a source at temperature T1 and sink at temperature T2 now a temperature gradient sets up in the rod after steady state is reached temperature at some distance X from the source end is given as...
  45. E

    Nonlinear optics: second harmonic generation

    Hello, I'm studying basic nonlinear optics and I would like to solve a couple doubts about (basic) photon interaction. Let a monocromatic (of frequency ω) electromagnetic field propagate through a nonlinear medium and let the third(and higher)-order terms in the relation between the...
  46. B

    Small scale power generation

    Hi, I'm a Mech. Eng., so forgive my ignorance to power electronics, but I'm hoping someone can explain this to me. Considering the scenario where a small gas turbine (< 500 kW) drives a generator to provide power to the power grid. The power output of the turbine will not be constant...
  47. C

    Localized absorption of photons and carrier generation

    Perturbation theory predicts rates of transitions between eigenstates of the unperturbed Hamiltonian, which in the independent electron model for a crystal are nonlocal Bloch wave functions or linear combinations of them that extend throughout the crystal. However, photon absorption is...
  48. D

    Energy Generation through Gravity (mining operation monorail)

    Hello, I am looking for some help in determining a potential energy generation project. Our open cast mine produces roughly 250 metric tonnes of raw rock per hour which is transported to the process area by an industrial monorail. The interesting thing is this monorail needs no power as the...
  49. E

    Generation of Static Electricity

    I was wondering if and/or how one would could calculate the the generation of static electricity between 2 materials. For example material A is immersed in substance B and moves within it at a constant velocity. Knowing the velocity and volume / surface area of material A and the electron...
  50. U

    Entropy generation in chemical reactions

    So from the first law for a closed system, dU=dQ-dW=dQ-PdV From the second law, dS=dQ/T + Sgenerated (i.e. the entropy generated) Putting expression of dQ from second law into first law, dU=T*dS-T*Sgen-PdV If s and v are constant, dU= -T*Sgen>0 Hence dU<0 This is a...
Back
Top